[net-next PATCH 0/5] GRO Fixed IPv4 ID support and GSO partial support

[net-next PATCH 0/5] GRO Fixed IPv4 ID support and GSO partial support

[Alexander Duyck]

This patch series sets up a few different things.

First it adds support for GRO of frames with a fixed IP ID value.  This
will allow us to perform GRO for frames that go through things like an IPv6
to IPv4 header translation.

The second item we add is support for segmenting frames that are generated
this way.  Most devices only support an incrementing IP ID value, and in
the case of TCP the IP ID can be ignored in many cases since the DF bit
should be set.  So we can technically segment these frames using existing
TSO if we are willing to allow the IP ID to be mangled.  As such I have
added a matching feature for the new form of GRO/GSO called TCP IPv4 ID
mangling.  With this enabled we can assemble and disassemble a frame with
the sequence number fixed and the only ill effect will be that the IPv4 ID
will be altered which may or may not have any noticeable effect.  As such I
have defaulted the feature to disabled.

The third item this patch series adds is support for partial GSO
segmentation.  Partial GSO segmentation allows us to split a large frame
into two pieces.  The first piece will have an even multiple of MSS worth
of data and the headers before the one pointed to by csum_start will have
been updated so that they are correct for if the data payload had already
been segmented.  By doing this we can do things such as precompute the
outer header checksums for a frame to be segmented allowing us to perform
TSO on devices that don't support tunneling, or tunneling with outer header
checksums.

This patch series currently relies on a patch that is in the net tree.  As
such it may be best to defer applying it until the net tree is merged.  In
addition I have some patches for the Intel NIC drivers that I will submit
as an RFC for now and will submit to Jeff Kirsher once this patch series
has been applied.

---

Alexander Duyck (5):
      ethtool: Add support for toggling any of the GSO offloads
      GSO: Add GSO type for fixed IPv4 ID
      GRO: Add support for TCP with fixed IPv4 ID field, limit tunnel IP ID values
      GSO: Support partial segmentation offload
      Documentation: Add documentation for TSO and GSO features


 Documentation/networking/segmentation-offloads.txt |  130 ++++++++++++++++++++
 include/linux/netdev_features.h                    |    8 +
 include/linux/netdevice.h                          |    8 +
 include/linux/skbuff.h                             |   27 +++-
 net/core/dev.c                                     |   38 +++++-
 net/core/ethtool.c                                 |    4 +
 net/core/skbuff.c                                  |   29 ++++
 net/ipv4/af_inet.c                                 |   70 ++++++++---
 net/ipv4/gre_offload.c                             |   27 +++-
 net/ipv4/tcp_offload.c                             |   30 ++++-
 net/ipv4/udp_offload.c                             |   27 +++-
 net/ipv6/ip6_offload.c                             |   21 +++
 12 files changed, 368 insertions(+), 51 deletions(-)
 create mode 100644 Documentation/networking/segmentation-offloads.txt

[net-next PATCH 1/5] ethtool: Add support for toggling any of the GSO offloads

[Alexander Duyck]

The strings were missing for several of the GSO offloads that are
available.  This patch provides the missing strings so that we can toggle
or query any of them via the ethtool command.

Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
---
 net/core/ethtool.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index f426c5ad6149..6a7f99661c2f 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -82,9 +82,11 @@ static const char netdev_features_strings[NETDEV_FEATURE_COUNT][ETH_GSTRING_LEN]
 	[NETIF_F_TSO6_BIT] =             "tx-tcp6-segmentation",
 	[NETIF_F_FSO_BIT] =              "tx-fcoe-segmentation",
 	[NETIF_F_GSO_GRE_BIT] =		 "tx-gre-segmentation",
+	[NETIF_F_GSO_GRE_CSUM_BIT] =	 "tx-gre-csum-segmentation",
 	[NETIF_F_GSO_IPIP_BIT] =	 "tx-ipip-segmentation",
 	[NETIF_F_GSO_SIT_BIT] =		 "tx-sit-segmentation",
 	[NETIF_F_GSO_UDP_TUNNEL_BIT] =	 "tx-udp_tnl-segmentation",
+	[NETIF_F_GSO_UDP_TUNNEL_CSUM_BIT] = "tx-udp_tnl-csum-segmentation",
 
 	[NETIF_F_FCOE_CRC_BIT] =         "tx-checksum-fcoe-crc",
 	[NETIF_F_SCTP_CRC_BIT] =        "tx-checksum-sctp",

[net-next PATCH 2/5] GSO: Add GSO type for fixed IPv4 ID

[Alexander Duyck]

This patch adds support for TSO using IPv4 headers with a fixed IP ID
field.  This is meant to allow us to do a lossless GRO in the case of TCP
flows that use a fixed IP ID such as those that convert IPv6 header to IPv4
headers.

In addition I am adding a feature that for now I am referring to TSO with
IP ID mangling.  Basically when this flag is enabled the device has the
option to either output the flow with incrementing IP IDs or with a fixed
IP ID regardless of what the original IP ID ordering was.  This is useful
in cases where the DF bit is set and we do not care if the original IP ID
value is maintained.

Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
---
 include/linux/netdev_features.h |    3 +++
 include/linux/netdevice.h       |    1 +
 include/linux/skbuff.h          |   20 +++++++++++---------
 net/core/dev.c                  |    6 ++++--
 net/core/ethtool.c              |    1 +
 net/ipv4/af_inet.c              |   19 +++++++++++--------
 net/ipv4/gre_offload.c          |    1 +
 net/ipv4/tcp_offload.c          |    4 +++-
 net/ipv6/ip6_offload.c          |    3 ++-
 9 files changed, 37 insertions(+), 21 deletions(-)

diff --git a/include/linux/netdev_features.h b/include/linux/netdev_features.h
index a734bf43d190..7cf272a4b5c8 100644
--- a/include/linux/netdev_features.h
+++ b/include/linux/netdev_features.h
@@ -39,6 +39,7 @@ enum {
 	NETIF_F_UFO_BIT,		/* ... UDPv4 fragmentation */
 	NETIF_F_GSO_ROBUST_BIT,		/* ... ->SKB_GSO_DODGY */
 	NETIF_F_TSO_ECN_BIT,		/* ... TCP ECN support */
+	NETIF_F_TSO_MANGLEID_BIT,	/* ... IPV4 ID mangling allowed */
 	NETIF_F_TSO6_BIT,		/* ... TCPv6 segmentation */
 	NETIF_F_FSO_BIT,		/* ... FCoE segmentation */
 	NETIF_F_GSO_GRE_BIT,		/* ... GRE with TSO */
@@ -120,6 +121,7 @@ enum {
 #define NETIF_F_GSO_SIT		__NETIF_F(GSO_SIT)
 #define NETIF_F_GSO_UDP_TUNNEL	__NETIF_F(GSO_UDP_TUNNEL)
 #define NETIF_F_GSO_UDP_TUNNEL_CSUM __NETIF_F(GSO_UDP_TUNNEL_CSUM)
+#define NETIF_F_TSO_MANGLEID	__NETIF_F(TSO_MANGLEID)
 #define NETIF_F_GSO_TUNNEL_REMCSUM __NETIF_F(GSO_TUNNEL_REMCSUM)
 #define NETIF_F_HW_VLAN_STAG_FILTER __NETIF_F(HW_VLAN_STAG_FILTER)
 #define NETIF_F_HW_VLAN_STAG_RX	__NETIF_F(HW_VLAN_STAG_RX)
@@ -147,6 +149,7 @@ enum {
 
 /* List of features with software fallbacks. */
 #define NETIF_F_GSO_SOFTWARE	(NETIF_F_TSO | NETIF_F_TSO_ECN | \
+				 NETIF_F_TSO_MANGLEID | \
 				 NETIF_F_TSO6 | NETIF_F_UFO)
 
 /* List of IP checksum features. Note that NETIF_F_ HW_CSUM should not be
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 166402ae3324..ffc12f565ed9 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -3994,6 +3994,7 @@ static inline bool net_gso_ok(netdev_features_t features, int gso_type)
 	BUILD_BUG_ON(SKB_GSO_UDP     != (NETIF_F_UFO >> NETIF_F_GSO_SHIFT));
 	BUILD_BUG_ON(SKB_GSO_DODGY   != (NETIF_F_GSO_ROBUST >> NETIF_F_GSO_SHIFT));
 	BUILD_BUG_ON(SKB_GSO_TCP_ECN != (NETIF_F_TSO_ECN >> NETIF_F_GSO_SHIFT));
+	BUILD_BUG_ON(SKB_GSO_TCP_FIXEDID != (NETIF_F_TSO_MANGLEID >> NETIF_F_GSO_SHIFT));
 	BUILD_BUG_ON(SKB_GSO_TCPV6   != (NETIF_F_TSO6 >> NETIF_F_GSO_SHIFT));
 	BUILD_BUG_ON(SKB_GSO_FCOE    != (NETIF_F_FSO >> NETIF_F_GSO_SHIFT));
 	BUILD_BUG_ON(SKB_GSO_GRE     != (NETIF_F_GSO_GRE >> NETIF_F_GSO_SHIFT));
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 007381270ff8..5fba16658f9d 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -465,23 +465,25 @@ enum {
 	/* This indicates the tcp segment has CWR set. */
 	SKB_GSO_TCP_ECN = 1 << 3,
 
-	SKB_GSO_TCPV6 = 1 << 4,
+	SKB_GSO_TCP_FIXEDID = 1 << 4,
 
-	SKB_GSO_FCOE = 1 << 5,
+	SKB_GSO_TCPV6 = 1 << 5,
 
-	SKB_GSO_GRE = 1 << 6,
+	SKB_GSO_FCOE = 1 << 6,
 
-	SKB_GSO_GRE_CSUM = 1 << 7,
+	SKB_GSO_GRE = 1 << 7,
 
-	SKB_GSO_IPIP = 1 << 8,
+	SKB_GSO_GRE_CSUM = 1 << 8,
 
-	SKB_GSO_SIT = 1 << 9,
+	SKB_GSO_IPIP = 1 << 9,
 
-	SKB_GSO_UDP_TUNNEL = 1 << 10,
+	SKB_GSO_SIT = 1 << 10,
 
-	SKB_GSO_UDP_TUNNEL_CSUM = 1 << 11,
+	SKB_GSO_UDP_TUNNEL = 1 << 11,
 
-	SKB_GSO_TUNNEL_REMCSUM = 1 << 12,
+	SKB_GSO_UDP_TUNNEL_CSUM = 1 << 12,
+
+	SKB_GSO_TUNNEL_REMCSUM = 1 << 13,
 };
 
 #if BITS_PER_LONG > 32
diff --git a/net/core/dev.c b/net/core/dev.c
index d51343a821ed..16def40dfbe8 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6976,9 +6976,11 @@ int register_netdevice(struct net_device *dev)
 	dev->features |= NETIF_F_SOFT_FEATURES;
 	dev->wanted_features = dev->features & dev->hw_features;
 
-	if (!(dev->flags & IFF_LOOPBACK)) {
+	if (!(dev->flags & IFF_LOOPBACK))
 		dev->hw_features |= NETIF_F_NOCACHE_COPY;
-	}
+
+	if (dev->hw_features & NETIF_F_TSO)
+		dev->hw_features |= NETIF_F_TSO_MANGLEID;
 
 	/* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
 	 */
diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 6a7f99661c2f..9494c41cc77c 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -79,6 +79,7 @@ static const char netdev_features_strings[NETDEV_FEATURE_COUNT][ETH_GSTRING_LEN]
 	[NETIF_F_UFO_BIT] =              "tx-udp-fragmentation",
 	[NETIF_F_GSO_ROBUST_BIT] =       "tx-gso-robust",
 	[NETIF_F_TSO_ECN_BIT] =          "tx-tcp-ecn-segmentation",
+	[NETIF_F_TSO_MANGLEID_BIT] =	 "tx-tcp-mangleid-segmentation",
 	[NETIF_F_TSO6_BIT] =             "tx-tcp6-segmentation",
 	[NETIF_F_FSO_BIT] =              "tx-fcoe-segmentation",
 	[NETIF_F_GSO_GRE_BIT] =		 "tx-gre-segmentation",
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 8217cd22f921..5bbea9a0ce96 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1195,10 +1195,10 @@ EXPORT_SYMBOL(inet_sk_rebuild_header);
 static struct sk_buff *inet_gso_segment(struct sk_buff *skb,
 					netdev_features_t features)
 {
+	bool udpfrag = false, fixedid = false, encap;
 	struct sk_buff *segs = ERR_PTR(-EINVAL);
 	const struct net_offload *ops;
 	unsigned int offset = 0;
-	bool udpfrag, encap;
 	struct iphdr *iph;
 	int proto;
 	int nhoff;
@@ -1217,6 +1217,7 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb,
 		       SKB_GSO_TCPV6 |
 		       SKB_GSO_UDP_TUNNEL |
 		       SKB_GSO_UDP_TUNNEL_CSUM |
+		       SKB_GSO_TCP_FIXEDID |
 		       SKB_GSO_TUNNEL_REMCSUM |
 		       0)))
 		goto out;
@@ -1248,11 +1249,14 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb,
 
 	segs = ERR_PTR(-EPROTONOSUPPORT);
 
-	if (skb->encapsulation &&
-	    skb_shinfo(skb)->gso_type & (SKB_GSO_SIT|SKB_GSO_IPIP))
-		udpfrag = proto == IPPROTO_UDP && encap;
-	else
-		udpfrag = proto == IPPROTO_UDP && !skb->encapsulation;
+	if (!skb->encapsulation || encap) {
+		udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP);
+		fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID);
+
+		/* fixed ID is invalid if DF bit is not set */
+		if (fixedid && !(iph->frag_off & htons(IP_DF)))
+			goto out;
+	}
 
 	ops = rcu_dereference(inet_offloads[proto]);
 	if (likely(ops && ops->callbacks.gso_segment))
@@ -1265,12 +1269,11 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb,
 	do {
 		iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
 		if (udpfrag) {
-			iph->id = htons(id);
 			iph->frag_off = htons(offset >> 3);
 			if (skb->next)
 				iph->frag_off |= htons(IP_MF);
 			offset += skb->len - nhoff - ihl;
-		} else {
+		} else if (!fixedid) {
 			iph->id = htons(id++);
 		}
 		iph->tot_len = htons(skb->len - nhoff);
diff --git a/net/ipv4/gre_offload.c b/net/ipv4/gre_offload.c
index 6a5bd4317866..6376b0cdf693 100644
--- a/net/ipv4/gre_offload.c
+++ b/net/ipv4/gre_offload.c
@@ -32,6 +32,7 @@ static struct sk_buff *gre_gso_segment(struct sk_buff *skb,
 				  SKB_GSO_UDP |
 				  SKB_GSO_DODGY |
 				  SKB_GSO_TCP_ECN |
+				  SKB_GSO_TCP_FIXEDID |
 				  SKB_GSO_GRE |
 				  SKB_GSO_GRE_CSUM |
 				  SKB_GSO_IPIP |
diff --git a/net/ipv4/tcp_offload.c b/net/ipv4/tcp_offload.c
index 773083b7f1e9..08dd25d835af 100644
--- a/net/ipv4/tcp_offload.c
+++ b/net/ipv4/tcp_offload.c
@@ -89,6 +89,7 @@ struct sk_buff *tcp_gso_segment(struct sk_buff *skb,
 			     ~(SKB_GSO_TCPV4 |
 			       SKB_GSO_DODGY |
 			       SKB_GSO_TCP_ECN |
+			       SKB_GSO_TCP_FIXEDID |
 			       SKB_GSO_TCPV6 |
 			       SKB_GSO_GRE |
 			       SKB_GSO_GRE_CSUM |
@@ -98,7 +99,8 @@ struct sk_buff *tcp_gso_segment(struct sk_buff *skb,
 			       SKB_GSO_UDP_TUNNEL_CSUM |
 			       SKB_GSO_TUNNEL_REMCSUM |
 			       0) ||
-			     !(type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6))))
+			     !(type & (SKB_GSO_TCPV4 |
+				       SKB_GSO_TCPV6))))
 			goto out;
 
 		skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c
index 204af2219471..b3a779393d71 100644
--- a/net/ipv6/ip6_offload.c
+++ b/net/ipv6/ip6_offload.c
@@ -73,6 +73,8 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
 		       SKB_GSO_UDP |
 		       SKB_GSO_DODGY |
 		       SKB_GSO_TCP_ECN |
+		       SKB_GSO_TCP_FIXEDID |
+		       SKB_GSO_TCPV6 |
 		       SKB_GSO_GRE |
 		       SKB_GSO_GRE_CSUM |
 		       SKB_GSO_IPIP |
@@ -80,7 +82,6 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
 		       SKB_GSO_UDP_TUNNEL |
 		       SKB_GSO_UDP_TUNNEL_CSUM |
 		       SKB_GSO_TUNNEL_REMCSUM |
-		       SKB_GSO_TCPV6 |
 		       0)))
 		goto out;
 

Re: [net-next PATCH 2/5] GSO: Add GSO type for fixed IPv4 ID

[Jesse Gross]

On Fri, Apr 8, 2016 at 5:33 PM, Alexander Duyck <aduyck@mirantis.com> wrote:
> This patch adds support for TSO using IPv4 headers with a fixed IP ID
> field.  This is meant to allow us to do a lossless GRO in the case of TCP
> flows that use a fixed IP ID such as those that convert IPv6 header to IPv4
> headers.
>
> In addition I am adding a feature that for now I am referring to TSO with
> IP ID mangling.  Basically when this flag is enabled the device has the
> option to either output the flow with incrementing IP IDs or with a fixed
> IP ID regardless of what the original IP ID ordering was.  This is useful
> in cases where the DF bit is set and we do not care if the original IP ID
> value is maintained.
>
> Signed-off-by: Alexander Duyck <aduyck@mirantis.com>

I think SKB_GSO_TCP_FIXEDID would also need to be added to the list of
enumerated OK GSO types for MPLS GSO.

Re: [net-next PATCH 2/5] GSO: Add GSO type for fixed IPv4 ID

[Alexander Duyck]

On Fri, Apr 8, 2016 at 2:41 PM, Jesse Gross <jesse@kernel.org> wrote:
> On Fri, Apr 8, 2016 at 5:33 PM, Alexander Duyck <aduyck@mirantis.com> wrote:
>> This patch adds support for TSO using IPv4 headers with a fixed IP ID
>> field.  This is meant to allow us to do a lossless GRO in the case of TCP
>> flows that use a fixed IP ID such as those that convert IPv6 header to IPv4
>> headers.
>>
>> In addition I am adding a feature that for now I am referring to TSO with
>> IP ID mangling.  Basically when this flag is enabled the device has the
>> option to either output the flow with incrementing IP IDs or with a fixed
>> IP ID regardless of what the original IP ID ordering was.  This is useful
>> in cases where the DF bit is set and we do not care if the original IP ID
>> value is maintained.
>>
>> Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
>
> I think SKB_GSO_TCP_FIXEDID would also need to be added to the list of
> enumerated OK GSO types for MPLS GSO.

I'll have that fixed for v2.

- Alex

[net-next PATCH 3/5] GRO: Add support for TCP with fixed IPv4 ID field, limit tunnel IP ID values

[Alexander Duyck]

This patch does two things.

First it allows TCP to aggregate TCP frames with a fixed IPv4 ID field.  As
a result we should now be able to aggregate flows that were converted from
IPv6 to IPv4.  In addition this allows us more flexibility for future
implementations of segmentation as we may be able to use a fixed IP ID when
segmenting the flow.

The second thing this does is that it places limitations on the outer IPv4
ID header in the case of tunneled frames.  Specifically it forces the IP ID
to be incrementing by 1 unless the DF bit is set in the outer IPv4 header.
This way we can avoid creating overlapping series of IP IDs that could
possibly be fragmented if the frame goes through GRO and is then
resegmented via GSO.

Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
---
 include/linux/netdevice.h |    5 ++++-
 net/core/dev.c            |    1 +
 net/ipv4/af_inet.c        |   35 ++++++++++++++++++++++++++++-------
 net/ipv4/tcp_offload.c    |   16 +++++++++++++++-
 net/ipv6/ip6_offload.c    |    8 ++++++--
 5 files changed, 54 insertions(+), 11 deletions(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index ffc12f565ed9..a3ac84ac8cb0 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2123,7 +2123,10 @@ struct napi_gro_cb {
 	/* Used in GRE, set in fou/gue_gro_receive */
 	u8	is_fou:1;
 
-	/* 6 bit hole */
+	/* Used to determine if flush_id can be ignored */
+	u8	is_atomic:1;
+
+	/* 5 bit hole */
 
 	/* used to support CHECKSUM_COMPLETE for tunneling protocols */
 	__wsum	csum;
diff --git a/net/core/dev.c b/net/core/dev.c
index 16def40dfbe8..235e0f3e34f0 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4440,6 +4440,7 @@ static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff
 		NAPI_GRO_CB(skb)->free = 0;
 		NAPI_GRO_CB(skb)->encap_mark = 0;
 		NAPI_GRO_CB(skb)->is_fou = 0;
+		NAPI_GRO_CB(skb)->is_atomic = 1;
 		NAPI_GRO_CB(skb)->gro_remcsum_start = 0;
 
 		/* Setup for GRO checksum validation */
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 5bbea9a0ce96..8564cab96189 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1328,6 +1328,7 @@ static struct sk_buff **inet_gro_receive(struct sk_buff **head,
 
 	for (p = *head; p; p = p->next) {
 		struct iphdr *iph2;
+		u16 flush_id;
 
 		if (!NAPI_GRO_CB(p)->same_flow)
 			continue;
@@ -1351,16 +1352,36 @@ static struct sk_buff **inet_gro_receive(struct sk_buff **head,
 			(iph->tos ^ iph2->tos) |
 			((iph->frag_off ^ iph2->frag_off) & htons(IP_DF));
 
-		/* Save the IP ID check to be included later when we get to
-		 * the transport layer so only the inner most IP ID is checked.
-		 * This is because some GSO/TSO implementations do not
-		 * correctly increment the IP ID for the outer hdrs.
-		 */
-		NAPI_GRO_CB(p)->flush_id =
-			    ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id);
 		NAPI_GRO_CB(p)->flush |= flush;
+
+		/* We need to store of the IP ID check to be included later
+		 * when we can verify that this packet does in fact belong
+		 * to a given flow.
+		 */
+		flush_id = (u16)(id - ntohs(iph2->id));
+
+		/* This bit of code makes it much easier for us to identify
+		 * the cases where we are doing atomic vs non-atomic IP ID
+		 * checks.  Specifically an atomic check can return IP ID
+		 * values 0 - 0xFFFF, while a non-atomic check can only
+		 * return 0 or 0xFFFF.
+		 */
+		if (!NAPI_GRO_CB(p)->is_atomic ||
+		    !(iph->frag_off & htons(IP_DF))) {
+			flush_id ^= NAPI_GRO_CB(p)->count;
+			flush_id = flush_id ? 0xFFFF : 0;
+		}
+
+		/* If the previous IP ID value was based on an atomic
+		 * datagram we can overwrite the value and ignore it.
+		 */
+		if (NAPI_GRO_CB(skb)->is_atomic)
+			NAPI_GRO_CB(p)->flush_id = flush_id;
+		else
+			NAPI_GRO_CB(p)->flush_id |= flush_id;
 	}
 
+	NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF));
 	NAPI_GRO_CB(skb)->flush |= flush;
 	skb_set_network_header(skb, off);
 	/* The above will be needed by the transport layer if there is one
diff --git a/net/ipv4/tcp_offload.c b/net/ipv4/tcp_offload.c
index 08dd25d835af..d1ffd55289bd 100644
--- a/net/ipv4/tcp_offload.c
+++ b/net/ipv4/tcp_offload.c
@@ -239,7 +239,7 @@ struct sk_buff **tcp_gro_receive(struct sk_buff **head, struct sk_buff *skb)
 
 found:
 	/* Include the IP ID check below from the inner most IP hdr */
-	flush = NAPI_GRO_CB(p)->flush | NAPI_GRO_CB(p)->flush_id;
+	flush = NAPI_GRO_CB(p)->flush;
 	flush |= (__force int)(flags & TCP_FLAG_CWR);
 	flush |= (__force int)((flags ^ tcp_flag_word(th2)) &
 		  ~(TCP_FLAG_CWR | TCP_FLAG_FIN | TCP_FLAG_PSH));
@@ -248,6 +248,17 @@ found:
 		flush |= *(u32 *)((u8 *)th + i) ^
 			 *(u32 *)((u8 *)th2 + i);
 
+	/* When we receive our second frame we can made a decision on if we
+	 * continue this flow as an atomic flow with a fixed ID or if we use
+	 * an incrementing ID.
+	 */
+	if (NAPI_GRO_CB(p)->flush_id != 1 ||
+	    NAPI_GRO_CB(p)->count != 1 ||
+	    !NAPI_GRO_CB(p)->is_atomic)
+		flush |= NAPI_GRO_CB(p)->flush_id;
+	else
+		NAPI_GRO_CB(p)->is_atomic = false;
+
 	mss = skb_shinfo(p)->gso_size;
 
 	flush |= (len - 1) >= mss;
@@ -316,6 +327,9 @@ static int tcp4_gro_complete(struct sk_buff *skb, int thoff)
 				  iph->daddr, 0);
 	skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV4;
 
+	if (NAPI_GRO_CB(skb)->is_atomic)
+		skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_FIXEDID;
+
 	return tcp_gro_complete(skb);
 }
 
diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c
index b3a779393d71..061adcda65f3 100644
--- a/net/ipv6/ip6_offload.c
+++ b/net/ipv6/ip6_offload.c
@@ -240,10 +240,14 @@ static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
 		NAPI_GRO_CB(p)->flush |= !!(first_word & htonl(0x0FF00000));
 		NAPI_GRO_CB(p)->flush |= flush;
 
-		/* Clear flush_id, there's really no concept of ID in IPv6. */
-		NAPI_GRO_CB(p)->flush_id = 0;
+		/* If the previous IP ID value was based on an atomic
+		 * datagram we can overwrite the value and ignore it.
+		 */
+		if (NAPI_GRO_CB(skb)->is_atomic)
+			NAPI_GRO_CB(p)->flush_id = 0;
 	}
 
+	NAPI_GRO_CB(skb)->is_atomic = true;
 	NAPI_GRO_CB(skb)->flush |= flush;
 
 	skb_gro_postpull_rcsum(skb, iph, nlen);

[net-next PATCH 4/5] GSO: Support partial segmentation offload

[Alexander Duyck]

This patch adds support for something I am referring to as GSO partial.
The basic idea is that we can support a broader range of devices for
segmentation if we use fixed outer headers and have the hardware only
really deal with segmenting the inner header.  The idea behind the naming
is due to the fact that everything before csum_start will be fixed headers,
and everything after will be the region that is handled by hardware.

With the current implementation it allows us to add support for the
following GSO types with an inner TSO_MANGLEID or TSO6 offload:
NETIF_F_GSO_GRE
NETIF_F_GSO_GRE_CSUM
NETIF_F_GSO_IPIP
NETIF_F_GSO_SIT
NETIF_F_UDP_TUNNEL
NETIF_F_UDP_TUNNEL_CSUM

In the case of hardware that already supports tunneling we may be able to
extend this further to support TSO_TCPV4 without TSO_MANGLEID if the
hardware can support updating inner IPv4 headers.

Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
---
 include/linux/netdev_features.h |    5 +++++
 include/linux/netdevice.h       |    2 ++
 include/linux/skbuff.h          |    9 +++++++--
 net/core/dev.c                  |   31 ++++++++++++++++++++++++++++++-
 net/core/ethtool.c              |    1 +
 net/core/skbuff.c               |   29 ++++++++++++++++++++++++++++-
 net/ipv4/af_inet.c              |   20 ++++++++++++++++----
 net/ipv4/gre_offload.c          |   26 +++++++++++++++++++++-----
 net/ipv4/tcp_offload.c          |   10 ++++++++--
 net/ipv4/udp_offload.c          |   27 +++++++++++++++++++++------
 net/ipv6/ip6_offload.c          |   10 +++++++++-
 11 files changed, 148 insertions(+), 22 deletions(-)

diff --git a/include/linux/netdev_features.h b/include/linux/netdev_features.h
index 7cf272a4b5c8..9fc79df0e561 100644
--- a/include/linux/netdev_features.h
+++ b/include/linux/netdev_features.h
@@ -48,6 +48,10 @@ enum {
 	NETIF_F_GSO_SIT_BIT,		/* ... SIT tunnel with TSO */
 	NETIF_F_GSO_UDP_TUNNEL_BIT,	/* ... UDP TUNNEL with TSO */
 	NETIF_F_GSO_UDP_TUNNEL_CSUM_BIT,/* ... UDP TUNNEL with TSO & CSUM */
+	NETIF_F_GSO_PARTIAL_BIT,	/* ... Only segment inner-most L4
+					 *     in hardware and all other
+					 *     headers in software.
+					 */
 	NETIF_F_GSO_TUNNEL_REMCSUM_BIT, /* ... TUNNEL with TSO & REMCSUM */
 	/**/NETIF_F_GSO_LAST =		/* last bit, see GSO_MASK */
 		NETIF_F_GSO_TUNNEL_REMCSUM_BIT,
@@ -122,6 +126,7 @@ enum {
 #define NETIF_F_GSO_UDP_TUNNEL	__NETIF_F(GSO_UDP_TUNNEL)
 #define NETIF_F_GSO_UDP_TUNNEL_CSUM __NETIF_F(GSO_UDP_TUNNEL_CSUM)
 #define NETIF_F_TSO_MANGLEID	__NETIF_F(TSO_MANGLEID)
+#define NETIF_F_GSO_PARTIAL	 __NETIF_F(GSO_PARTIAL)
 #define NETIF_F_GSO_TUNNEL_REMCSUM __NETIF_F(GSO_TUNNEL_REMCSUM)
 #define NETIF_F_HW_VLAN_STAG_FILTER __NETIF_F(HW_VLAN_STAG_FILTER)
 #define NETIF_F_HW_VLAN_STAG_RX	__NETIF_F(HW_VLAN_STAG_RX)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index a3ac84ac8cb0..554efb93f0ed 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1656,6 +1656,7 @@ struct net_device {
 	netdev_features_t	vlan_features;
 	netdev_features_t	hw_enc_features;
 	netdev_features_t	mpls_features;
+	netdev_features_t	gso_partial_features;
 
 	int			ifindex;
 	int			group;
@@ -4006,6 +4007,7 @@ static inline bool net_gso_ok(netdev_features_t features, int gso_type)
 	BUILD_BUG_ON(SKB_GSO_SIT     != (NETIF_F_GSO_SIT >> NETIF_F_GSO_SHIFT));
 	BUILD_BUG_ON(SKB_GSO_UDP_TUNNEL != (NETIF_F_GSO_UDP_TUNNEL >> NETIF_F_GSO_SHIFT));
 	BUILD_BUG_ON(SKB_GSO_UDP_TUNNEL_CSUM != (NETIF_F_GSO_UDP_TUNNEL_CSUM >> NETIF_F_GSO_SHIFT));
+	BUILD_BUG_ON(SKB_GSO_PARTIAL != (NETIF_F_GSO_PARTIAL >> NETIF_F_GSO_SHIFT));
 	BUILD_BUG_ON(SKB_GSO_TUNNEL_REMCSUM != (NETIF_F_GSO_TUNNEL_REMCSUM >> NETIF_F_GSO_SHIFT));
 
 	return (features & feature) == feature;
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 5fba16658f9d..da0ace389fec 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -483,7 +483,9 @@ enum {
 
 	SKB_GSO_UDP_TUNNEL_CSUM = 1 << 12,
 
-	SKB_GSO_TUNNEL_REMCSUM = 1 << 13,
+	SKB_GSO_PARTIAL = 1 << 13,
+
+	SKB_GSO_TUNNEL_REMCSUM = 1 << 14,
 };
 
 #if BITS_PER_LONG > 32
@@ -3591,7 +3593,10 @@ static inline struct sec_path *skb_sec_path(struct sk_buff *skb)
  * Keeps track of level of encapsulation of network headers.
  */
 struct skb_gso_cb {
-	int	mac_offset;
+	union {
+		int	mac_offset;
+		int	data_offset;
+	};
 	int	encap_level;
 	__wsum	csum;
 	__u16	csum_start;
diff --git a/net/core/dev.c b/net/core/dev.c
index 235e0f3e34f0..d80010b3828f 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2711,6 +2711,19 @@ struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
 			return ERR_PTR(err);
 	}
 
+	/* Only report GSO partial support if it will enable us to
+	 * support segmentation on this frame without needing additional
+	 * work.
+	 */
+	if (features & NETIF_F_GSO_PARTIAL) {
+		netdev_features_t partial_features = NETIF_F_GSO_ROBUST;
+		struct net_device *dev = skb->dev;
+
+		partial_features |= dev->features & dev->gso_partial_features;
+		if (!skb_gso_ok(skb, features | partial_features))
+			features &= ~NETIF_F_GSO_PARTIAL;
+	}
+
 	BUILD_BUG_ON(SKB_SGO_CB_OFFSET +
 		     sizeof(*SKB_GSO_CB(skb)) > sizeof(skb->cb));
 
@@ -2841,6 +2854,14 @@ netdev_features_t netif_skb_features(struct sk_buff *skb)
 	if (skb->encapsulation)
 		features &= dev->hw_enc_features;
 
+	/* Support for GSO partial features requires software intervention
+	 * before we can actually process the packets so we need to strip
+	 * support for any partial features now and we can pull them back
+	 * in after we have partially segmented the frame.
+	 */
+	if (skb_is_gso(skb) && !(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL))
+		features &= ~dev->gso_partial_features;
+
 	if (skb_vlan_tagged(skb))
 		features = netdev_intersect_features(features,
 						     dev->vlan_features |
@@ -6707,6 +6728,14 @@ static netdev_features_t netdev_fix_features(struct net_device *dev,
 		}
 	}
 
+	/* GSO partial features require GSO partial be set */
+	if ((features & dev->gso_partial_features) &&
+	    !(features & NETIF_F_GSO_PARTIAL)) {
+		netdev_dbg(dev,
+			   "Dropping partially supported GSO features since no GSO partial.\n");
+		features &= ~dev->gso_partial_features;
+	}
+
 #ifdef CONFIG_NET_RX_BUSY_POLL
 	if (dev->netdev_ops->ndo_busy_poll)
 		features |= NETIF_F_BUSY_POLL;
@@ -6989,7 +7018,7 @@ int register_netdevice(struct net_device *dev)
 
 	/* Make NETIF_F_SG inheritable to tunnel devices.
 	 */
-	dev->hw_enc_features |= NETIF_F_SG;
+	dev->hw_enc_features |= NETIF_F_SG | NETIF_F_GSO_PARTIAL;
 
 	/* Make NETIF_F_SG inheritable to MPLS.
 	 */
diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 9494c41cc77c..e0cf20a3b3dd 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -88,6 +88,7 @@ static const char netdev_features_strings[NETDEV_FEATURE_COUNT][ETH_GSTRING_LEN]
 	[NETIF_F_GSO_SIT_BIT] =		 "tx-sit-segmentation",
 	[NETIF_F_GSO_UDP_TUNNEL_BIT] =	 "tx-udp_tnl-segmentation",
 	[NETIF_F_GSO_UDP_TUNNEL_CSUM_BIT] = "tx-udp_tnl-csum-segmentation",
+	[NETIF_F_GSO_PARTIAL_BIT] =	 "tx-gso-partial",
 
 	[NETIF_F_FCOE_CRC_BIT] =         "tx-checksum-fcoe-crc",
 	[NETIF_F_SCTP_CRC_BIT] =        "tx-checksum-sctp",
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index d04c2d1c8c87..4cc594cdaada 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -3076,8 +3076,9 @@ struct sk_buff *skb_segment(struct sk_buff *head_skb,
 	struct sk_buff *frag_skb = head_skb;
 	unsigned int offset = doffset;
 	unsigned int tnl_hlen = skb_tnl_header_len(head_skb);
+	unsigned int partial_segs = 0;
 	unsigned int headroom;
-	unsigned int len;
+	unsigned int len = head_skb->len;
 	__be16 proto;
 	bool csum;
 	int sg = !!(features & NETIF_F_SG);
@@ -3094,6 +3095,15 @@ struct sk_buff *skb_segment(struct sk_buff *head_skb,
 
 	csum = !!can_checksum_protocol(features, proto);
 
+	/* GSO partial only requires that we trim off any excess that
+	 * doesn't fit into an MSS sized block, so take care of that
+	 * now.
+	 */
+	if (features & NETIF_F_GSO_PARTIAL) {
+		partial_segs = len / mss;
+		mss *= partial_segs;
+	}
+
 	headroom = skb_headroom(head_skb);
 	pos = skb_headlen(head_skb);
 
@@ -3281,6 +3291,23 @@ perform_csum_check:
 	 */
 	segs->prev = tail;
 
+	/* Update GSO info on first skb in partial sequence. */
+	if (partial_segs) {
+		int type = skb_shinfo(head_skb)->gso_type;
+
+		/* Update type to add partial and then remove dodgy if set */
+		type |= SKB_GSO_PARTIAL;
+		type &= ~SKB_GSO_DODGY;
+
+		/* Update GSO info and prepare to start updating headers on
+		 * our way back down the stack of protocols.
+		 */
+		skb_shinfo(segs)->gso_size = skb_shinfo(head_skb)->gso_size;
+		skb_shinfo(segs)->gso_segs = partial_segs;
+		skb_shinfo(segs)->gso_type = type;
+		SKB_GSO_CB(segs)->data_offset = skb_headroom(segs) + doffset;
+	}
+
 	/* Following permits correct backpressure, for protocols
 	 * using skb_set_owner_w().
 	 * Idea is to tranfert ownership from head_skb to last segment.
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 8564cab96189..2e6e65fc4d20 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1200,7 +1200,7 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb,
 	const struct net_offload *ops;
 	unsigned int offset = 0;
 	struct iphdr *iph;
-	int proto;
+	int proto, tot_len;
 	int nhoff;
 	int ihl;
 	int id;
@@ -1219,6 +1219,7 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb,
 		       SKB_GSO_UDP_TUNNEL_CSUM |
 		       SKB_GSO_TCP_FIXEDID |
 		       SKB_GSO_TUNNEL_REMCSUM |
+		       SKB_GSO_PARTIAL |
 		       0)))
 		goto out;
 
@@ -1273,10 +1274,21 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb,
 			if (skb->next)
 				iph->frag_off |= htons(IP_MF);
 			offset += skb->len - nhoff - ihl;
-		} else if (!fixedid) {
-			iph->id = htons(id++);
+			tot_len = skb->len - nhoff;
+		} else if (skb_is_gso(skb)) {
+			if (!fixedid) {
+				iph->id = htons(id);
+				id += skb_shinfo(skb)->gso_segs;
+			}
+			tot_len = skb_shinfo(skb)->gso_size +
+				  SKB_GSO_CB(skb)->data_offset +
+				  skb->head - (unsigned char *)iph;
+		} else {
+			if (!fixedid)
+				iph->id = htons(id++);
+			tot_len = skb->len - nhoff;
 		}
-		iph->tot_len = htons(skb->len - nhoff);
+		iph->tot_len = htons(tot_len);
 		ip_send_check(iph);
 		if (encap)
 			skb_reset_inner_headers(skb);
diff --git a/net/ipv4/gre_offload.c b/net/ipv4/gre_offload.c
index 6376b0cdf693..20557f211408 100644
--- a/net/ipv4/gre_offload.c
+++ b/net/ipv4/gre_offload.c
@@ -36,7 +36,8 @@ static struct sk_buff *gre_gso_segment(struct sk_buff *skb,
 				  SKB_GSO_GRE |
 				  SKB_GSO_GRE_CSUM |
 				  SKB_GSO_IPIP |
-				  SKB_GSO_SIT)))
+				  SKB_GSO_SIT |
+				  SKB_GSO_PARTIAL)))
 		goto out;
 
 	if (!skb->encapsulation)
@@ -87,7 +88,7 @@ static struct sk_buff *gre_gso_segment(struct sk_buff *skb,
 	skb = segs;
 	do {
 		struct gre_base_hdr *greh;
-		__be32 *pcsum;
+		__sum16 *pcsum;
 
 		/* Set up inner headers if we are offloading inner checksum */
 		if (skb->ip_summed == CHECKSUM_PARTIAL) {
@@ -107,10 +108,25 @@ static struct sk_buff *gre_gso_segment(struct sk_buff *skb,
 			continue;
 
 		greh = (struct gre_base_hdr *)skb_transport_header(skb);
-		pcsum = (__be32 *)(greh + 1);
+		pcsum = (__sum16 *)(greh + 1);
+
+		if (skb_is_gso(skb)) {
+			unsigned int partial_adj;
+
+			/* Adjust checksum to account for the fact that
+			 * the partial checksum is based on actual size
+			 * whereas headers should be based on MSS size.
+			 */
+			partial_adj = skb->len + skb_headroom(skb) -
+				      SKB_GSO_CB(skb)->data_offset -
+				      skb_shinfo(skb)->gso_size;
+			*pcsum = ~csum_fold((__force __wsum)htonl(partial_adj));
+		} else {
+			*pcsum = 0;
+		}
 
-		*pcsum = 0;
-		*(__sum16 *)pcsum = gso_make_checksum(skb, 0);
+		*(pcsum + 1) = 0;
+		*pcsum = gso_make_checksum(skb, 0);
 	} while ((skb = skb->next));
 out:
 	return segs;
diff --git a/net/ipv4/tcp_offload.c b/net/ipv4/tcp_offload.c
index d1ffd55289bd..02737b607aa7 100644
--- a/net/ipv4/tcp_offload.c
+++ b/net/ipv4/tcp_offload.c
@@ -109,6 +109,12 @@ struct sk_buff *tcp_gso_segment(struct sk_buff *skb,
 		goto out;
 	}
 
+	/* GSO partial only requires splitting the frame into an MSS
+	 * multiple and possibly a remainder.  So update the mss now.
+	 */
+	if (features & NETIF_F_GSO_PARTIAL)
+		mss = skb->len - (skb->len % mss);
+
 	copy_destructor = gso_skb->destructor == tcp_wfree;
 	ooo_okay = gso_skb->ooo_okay;
 	/* All segments but the first should have ooo_okay cleared */
@@ -133,7 +139,7 @@ struct sk_buff *tcp_gso_segment(struct sk_buff *skb,
 	newcheck = ~csum_fold((__force __wsum)((__force u32)th->check +
 					       (__force u32)delta));
 
-	do {
+	while (skb->next) {
 		th->fin = th->psh = 0;
 		th->check = newcheck;
 
@@ -153,7 +159,7 @@ struct sk_buff *tcp_gso_segment(struct sk_buff *skb,
 
 		th->seq = htonl(seq);
 		th->cwr = 0;
-	} while (skb->next);
+	}
 
 	/* Following permits TCP Small Queues to work well with GSO :
 	 * The callback to TCP stack will be called at the time last frag
diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
index 6230cf4b0d2d..097060def7f0 100644
--- a/net/ipv4/udp_offload.c
+++ b/net/ipv4/udp_offload.c
@@ -39,8 +39,11 @@ static struct sk_buff *__skb_udp_tunnel_segment(struct sk_buff *skb,
 	 * 16 bit length field due to the header being added outside of an
 	 * IP or IPv6 frame that was already limited to 64K - 1.
 	 */
-	partial = csum_sub(csum_unfold(uh->check),
-			   (__force __wsum)htonl(skb->len));
+	if (skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL)
+		partial = (__force __wsum)uh->len;
+	else
+		partial = (__force __wsum)htonl(skb->len);
+	partial = csum_sub(csum_unfold(uh->check), partial);
 
 	/* setup inner skb. */
 	skb->encapsulation = 0;
@@ -89,7 +92,7 @@ static struct sk_buff *__skb_udp_tunnel_segment(struct sk_buff *skb,
 	udp_offset = outer_hlen - tnl_hlen;
 	skb = segs;
 	do {
-		__be16 len;
+		unsigned int len;
 
 		if (remcsum)
 			skb->ip_summed = CHECKSUM_NONE;
@@ -107,14 +110,26 @@ static struct sk_buff *__skb_udp_tunnel_segment(struct sk_buff *skb,
 		skb_reset_mac_header(skb);
 		skb_set_network_header(skb, mac_len);
 		skb_set_transport_header(skb, udp_offset);
-		len = htons(skb->len - udp_offset);
+		len = skb->len - udp_offset;
 		uh = udp_hdr(skb);
-		uh->len = len;
+
+		/* If we are only performing partial GSO the inner header
+		 * will be using a length value equal to only one MSS sized
+		 * segment instead of the entire frame.
+		 */
+		if (skb_is_gso(skb)) {
+			uh->len = htons(skb_shinfo(skb)->gso_size +
+					SKB_GSO_CB(skb)->data_offset +
+					skb->head - (unsigned char *)uh);
+		} else {
+			uh->len = htons(len);
+		}
 
 		if (!need_csum)
 			continue;
 
-		uh->check = ~csum_fold(csum_add(partial, (__force __wsum)len));
+		uh->check = ~csum_fold(csum_add(partial,
+				       (__force __wsum)htonl(len)));
 
 		if (skb->encapsulation || !offload_csum) {
 			uh->check = gso_make_checksum(skb, ~uh->check);
diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c
index 061adcda65f3..f5eb184e1093 100644
--- a/net/ipv6/ip6_offload.c
+++ b/net/ipv6/ip6_offload.c
@@ -63,6 +63,7 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
 	int proto;
 	struct frag_hdr *fptr;
 	unsigned int unfrag_ip6hlen;
+	unsigned int payload_len;
 	u8 *prevhdr;
 	int offset = 0;
 	bool encap, udpfrag;
@@ -82,6 +83,7 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
 		       SKB_GSO_UDP_TUNNEL |
 		       SKB_GSO_UDP_TUNNEL_CSUM |
 		       SKB_GSO_TUNNEL_REMCSUM |
+		       SKB_GSO_PARTIAL |
 		       0)))
 		goto out;
 
@@ -118,7 +120,13 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
 
 	for (skb = segs; skb; skb = skb->next) {
 		ipv6h = (struct ipv6hdr *)(skb_mac_header(skb) + nhoff);
-		ipv6h->payload_len = htons(skb->len - nhoff - sizeof(*ipv6h));
+		if (skb_is_gso(skb))
+			payload_len = skb_shinfo(skb)->gso_size +
+				      SKB_GSO_CB(skb)->data_offset +
+				      skb->head - (unsigned char *)(ipv6h + 1);
+		else
+			payload_len = skb->len - nhoff - sizeof(*ipv6h);
+		ipv6h->payload_len = htons(payload_len);
 		skb->network_header = (u8 *)ipv6h - skb->head;
 
 		if (udpfrag) {

[net-next PATCH 5/5] Documentation: Add documentation for TSO and GSO features

[Alexander Duyck]

This document is a starting point for defining the TSO and GSO features.
The whole thing is starting to get a bit messy so I wanted to make sure we
have notes somwhere to start describing what does and doesn't work.

Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
---
 Documentation/networking/segmentation-offloads.txt |  130 ++++++++++++++++++++
 1 file changed, 130 insertions(+)
 create mode 100644 Documentation/networking/segmentation-offloads.txt

diff --git a/Documentation/networking/segmentation-offloads.txt b/Documentation/networking/segmentation-offloads.txt
new file mode 100644
index 000000000000..f200467ade38
--- /dev/null
+++ b/Documentation/networking/segmentation-offloads.txt
@@ -0,0 +1,130 @@
+Segmentation Offloads in the Linux Networking Stack
+
+Introduction
+============
+
+This document describes a set of techniques in the Linux networking stack
+to take advantage of segmentation offload capabilities of various NICs.
+
+The following technologies are described:
+ * TCP Segmentation Offload - TSO
+ * UDP Fragmentation Offload - UFO
+ * IPIP, SIT, GRE, and UDP Tunnel Offloads
+ * Generic Segmentation Offload - GSO
+ * Generic Receive Offload - GRO
+ * Partial Generic Segmentation Offload - GSO_PARTIAL
+
+TCP Segmentation Offload
+========================
+
+TCP segmentation allows a device to segment a single frame into multiple
+frames with a data payload size specified in skb_shinfo()->gso_size.
+When TCP segmentation requested the bit for either SKB_GSO_TCP or
+SKB_GSO_TCP6 should be set in skb_shinfo()->gso_type and
+skb_shinfo()->gso_size should be set to a non-zero value.
+
+TCP segmentation is dependent on support for the use of partial checksum
+offload.  For this reason TSO is normally disabled if the Tx checksum
+offload for a given device is disabled.
+
+In order to support TCP segmentation offload it is necessary to populate
+the network and transport header offsets of the skbuff so that the device
+drivers will be able determine the offsets of the IP or IPv6 header and the
+TCP header.  In addition as CHECKSUM_PARTIAL is required csum_start should
+also point to the TCP header of the packet.
+
+For IPv4 segmentation we support one of two types in terms of the IP ID.
+The default behavior is to increment the IP ID with every segment.  If the
+GSO type SKB_GSO_TCP_FIXEDID is specified then we will not increment the IP
+ID and all segments will use the same IP ID.  If a device has
+NETIF_F_TSO_MANGLEID set then the IP ID can be ignored when performing TSO
+and we will either increment the IP ID for all frames, or leave it at a
+static value based on driver preference.
+
+UDP Fragmentation Offload
+=========================
+
+UDP fragmentation offload allows a device to fragment an oversized UDP
+datagram into multiple IPv4 fragments.  Many of the requirements for UDP
+fragmentation offload are the same as TSO.  However the IPv4 ID for
+fragments should not increment as a single IPv4 datagram is fragmented.
+
+IPIP, SIT, GRE, UDP Tunnel, and Remote Checksum Offloads
+========================================================
+
+In addition to the offloads described above it is possible for a frame to
+contain additional headers such as an outer tunnel.  In order to account
+for such instances an additional set of segmentation offload types were
+introduced including SKB_GSO_IPIP, SKB_GSO_SIT, SKB_GSO_GRE, and
+SKB_GSO_UDP_TUNNEL.  These extra segmentation types are used to identify
+cases where there are more than just 1 set of headers.  For example in the
+case of IPIP and SIT we should have the network and transport headers moved
+from the standard list of headers to "inner" header offsets.
+
+Currently only two levels of headers are supported.  The convention is to
+refer to the tunnel headers as the outer headers, while the encapsulated
+data is normally referred to as the inner headers.  Below is the list of
+calls to access the given headers:
+
+IPIP/SIT Tunnel:
+		Outer			Inner
+MAC		skb_mac_header
+Network		skb_network_header	skb_inner_network_header
+Transport	skb_transport_header
+
+UDP/GRE Tunnel:
+		Outer			Inner
+MAC		skb_mac_header		skb_inner_mac_header
+Network		skb_network_header	skb_inner_network_header
+Transport	skb_transport_header	skb_inner_transport_header
+
+In addition to the above tunnel types there are also SKB_GSO_GRE_CSUM and
+SKB_GSO_UDP_TUNNEL_CSUM.  These two additional tunnel types reflect the
+fact that the outer header also requests to have a non-zero checksum
+included in the outer header.
+
+Finally there is SKB_GSO_REMCSUM which indicates that a given tunnel header
+has requested a remote checksum offload.  In this case the inner headers
+will be left with a partial checksum and only the outer header checksum
+will be computed.
+
+Generic Segmentation Offload
+============================
+
+Generic segmentation offload is a pure software offload that is meant to
+deal with cases where device drivers cannot perform the offloads described
+above.  What occurs in GSO is that a given skbuff will have its data broken
+out over multiple skbuffs that have been resized to match the MSS provided
+via skb_shinfo()->gso_size.
+
+Before enabling any hardware segmentation offload a corresponding software
+offload is required in GSO.  Otherwise it becomes possible for a frame to
+be re-routed between devices and end up being unable to be transmitted.
+
+Generic Receive Offload
+=======================
+
+Generic receive offload is the complement to GSO.  Ideally any frame
+assembled by GRO should be segmented to create an identical sequence of
+frames using GSO, and any sequence of frames segmented by GSO should be
+able to be reassembled back to the original by GRO.  The only exception to
+this is IPv4 ID in the case that the DF bit is set for a given IP header.
+If the value of the IPv4 ID is not sequentially incrementing it will be
+altered so that it is when a frame assembled via GRO is segmented via GSO.
+
+Partial Generic Segmentation Offload
+====================================
+
+Partial generic segmentation offload is a hybrid between TSO and GSO.  What
+it effectively does is take advantage of certain traits of TCP and tunnels
+so that instead of having to rewrite the packet headers for each segment
+only the inner-most transport header and possibly the outer-most network
+header need to be updated.  This allows devices that do not support tunnel
+offloads or tunnel offloads with checksum to still make use of segmentation.
+
+With the partial offload what occurs is that all headers excluding the
+inner transport header are updated such that they will contain the correct
+values for if the header was simply duplicated.  The one exception to this
+is the outer IPv4 ID field.  It is up to the device drivers to guarantee
+that the IPv4 ID field is incremented in the case that a given header does
+not have the DF bit set.

[next-queue PATCH 0/3] Add support for GSO partial to Intel NIC drivers

[Alexander Duyck]

So these are the patches needed to enable tunnel segmentation offloads on
the igb, igbvf, ixgbe, and ixgbevf drivers.  In addition this patch extends
the i40e and i40evf drivers to include segmentation support for tunnels
with outer checksums.

The net performance gain for these patches are pretty significant.  In the
case of i40e a tunnel with outer checksums showed the following
improvement:
Throughput Throughput  Local Local   Result 
           Units       CPU   Service Tag    
                       Util  Demand         
                       %                    
14066.29   10^6bits/s  3.49  0.651   "before" 
20618.16   10^6bits/s  3.09  0.393   "after"

For ixgbe similar results were seen:
Throughput Throughput  Local  Local   Result 
           Units       CPU    Service Tag    
                       Util   Demand         
                       %               
12879.89   10^6bits/s  10.00  0.763   "before"
14286.77   10^6bits/s  5.74   0.395   "after" 

These patches all rely on the TSO_MANGLEID and GSO_PARTIAL patches so I
would not recommend applying them until those patches have first been
applied.

---

Alexander Duyck (3):
      i40e/i40evf: Add support for GSO partial with UDP_TUNNEL_CSUM and GRE_CSUM
      ixgbe/ixgbevf: Add support for GSO partial
      igb/igbvf: Add support for GSO partial


 drivers/net/ethernet/intel/i40e/i40e_main.c       |   10 +
 drivers/net/ethernet/intel/i40e/i40e_txrx.c       |    7 +
 drivers/net/ethernet/intel/i40evf/i40e_txrx.c     |    7 +
 drivers/net/ethernet/intel/i40evf/i40evf_main.c   |   10 +
 drivers/net/ethernet/intel/igb/igb_main.c         |  112 ++++++++++----
 drivers/net/ethernet/intel/igbvf/netdev.c         |  173 +++++++++++++--------
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c     |  105 +++++++++----
 drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c |  123 ++++++++++++---
 8 files changed, 391 insertions(+), 156 deletions(-)

[Intel-wired-lan] [next-queue PATCH 0/3] Add support for GSO partial to Intel NIC drivers

[Alexander Duyck]

So these are the patches needed to enable tunnel segmentation offloads on
the igb, igbvf, ixgbe, and ixgbevf drivers.  In addition this patch extends
the i40e and i40evf drivers to include segmentation support for tunnels
with outer checksums.

The net performance gain for these patches are pretty significant.  In the
case of i40e a tunnel with outer checksums showed the following
improvement:
Throughput Throughput  Local Local   Result 
           Units       CPU   Service Tag    
                       Util  Demand         
                       %                    
14066.29   10^6bits/s  3.49  0.651   "before" 
20618.16   10^6bits/s  3.09  0.393   "after"

For ixgbe similar results were seen:
Throughput Throughput  Local  Local   Result 
           Units       CPU    Service Tag    
                       Util   Demand         
                       %               
12879.89   10^6bits/s  10.00  0.763   "before"
14286.77   10^6bits/s  5.74   0.395   "after" 

These patches all rely on the TSO_MANGLEID and GSO_PARTIAL patches so I
would not recommend applying them until those patches have first been
applied.

---

Alexander Duyck (3):
      i40e/i40evf: Add support for GSO partial with UDP_TUNNEL_CSUM and GRE_CSUM
      ixgbe/ixgbevf: Add support for GSO partial
      igb/igbvf: Add support for GSO partial


 drivers/net/ethernet/intel/i40e/i40e_main.c       |   10 +
 drivers/net/ethernet/intel/i40e/i40e_txrx.c       |    7 +
 drivers/net/ethernet/intel/i40evf/i40e_txrx.c     |    7 +
 drivers/net/ethernet/intel/i40evf/i40evf_main.c   |   10 +
 drivers/net/ethernet/intel/igb/igb_main.c         |  112 ++++++++++----
 drivers/net/ethernet/intel/igbvf/netdev.c         |  173 +++++++++++++--------
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c     |  105 +++++++++----
 drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c |  123 ++++++++++++---
 8 files changed, 391 insertions(+), 156 deletions(-)

--

[next-queue PATCH 1/3] i40e/i40evf: Add support for GSO partial with UDP_TUNNEL_CSUM and GRE_CSUM

[Alexander Duyck]

This patch makes it so that i40e and i40evf can use GSO_PARTIAL to support
segmentation for frames with checksums enabled in outer headers.  As a
result we can now send data over these types of tunnels at over 20Gb/s
versus the 12Gb/s that was previously possible on my system.

The advantage with the i40e parts is that this offload is mostly
transparent as the hardware still deals with the inner and/or outer IPv4
headers so the IP ID is still incrementing for both when this offload is
performed.

Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
---
 drivers/net/ethernet/intel/i40e/i40e_main.c     |   10 ++++++++--
 drivers/net/ethernet/intel/i40e/i40e_txrx.c     |    7 ++++++-
 drivers/net/ethernet/intel/i40evf/i40e_txrx.c   |    7 ++++++-
 drivers/net/ethernet/intel/i40evf/i40evf_main.c |   10 ++++++++--
 4 files changed, 28 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 07a70c4ac49f..6342fab4d177 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -9119,20 +9119,25 @@ static int i40e_config_netdev(struct i40e_vsi *vsi)
 				   NETIF_F_TSO_ECN		|
 				   NETIF_F_TSO6			|
 				   NETIF_F_GSO_GRE		|
+				   NETIF_F_GSO_GRE_CSUM		|
 				   NETIF_F_GSO_IPIP		|
 				   NETIF_F_GSO_SIT		|
 				   NETIF_F_GSO_UDP_TUNNEL	|
 				   NETIF_F_GSO_UDP_TUNNEL_CSUM	|
+				   NETIF_F_GSO_PARTIAL		|
 				   NETIF_F_SCTP_CRC		|
 				   NETIF_F_RXHASH		|
 				   NETIF_F_RXCSUM		|
 				   0;
 
 	if (!(pf->flags & I40E_FLAG_OUTER_UDP_CSUM_CAPABLE))
-		netdev->hw_enc_features ^= NETIF_F_GSO_UDP_TUNNEL_CSUM;
+		netdev->gso_partial_features |= NETIF_F_GSO_UDP_TUNNEL_CSUM;
+
+	netdev->gso_partial_features |= NETIF_F_GSO_GRE_CSUM;
 
 	/* record features VLANs can make use of */
-	netdev->vlan_features |= netdev->hw_enc_features;
+	netdev->vlan_features |= netdev->hw_enc_features |
+				 NETIF_F_TSO_MANGLEID;
 
 	if (!(pf->flags & I40E_FLAG_MFP_ENABLED))
 		netdev->hw_features |= NETIF_F_NTUPLE;
@@ -9142,6 +9147,7 @@ static int i40e_config_netdev(struct i40e_vsi *vsi)
 			       NETIF_F_HW_VLAN_CTAG_RX;
 
 	netdev->features |= netdev->hw_features | NETIF_F_HW_VLAN_CTAG_FILTER;
+	netdev->hw_enc_features |= NETIF_F_TSO_MANGLEID;
 
 	if (vsi->type == I40E_VSI_MAIN) {
 		SET_NETDEV_DEV(netdev, &pf->pdev->dev);
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index 6e44cf118843..ede4183468b9 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -2300,11 +2300,15 @@ static int i40e_tso(struct sk_buff *skb, u8 *hdr_len, u64 *cd_type_cmd_tso_mss)
 	}
 
 	if (skb_shinfo(skb)->gso_type & (SKB_GSO_GRE |
+					 SKB_GSO_GRE_CSUM |
 					 SKB_GSO_IPIP |
 					 SKB_GSO_SIT |
 					 SKB_GSO_UDP_TUNNEL |
 					 SKB_GSO_UDP_TUNNEL_CSUM)) {
-		if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM) {
+		if (!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) &&
+		    (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM)) {
+			l4.udp->len = 0;
+
 			/* determine offset of outer transport header */
 			l4_offset = l4.hdr - skb->data;
 
@@ -2481,6 +2485,7 @@ static int i40e_tx_enable_csum(struct sk_buff *skb, u32 *tx_flags,
 
 		/* indicate if we need to offload outer UDP header */
 		if ((*tx_flags & I40E_TX_FLAGS_TSO) &&
+		    !(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) &&
 		    (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM))
 			tunnel |= I40E_TXD_CTX_QW0_L4T_CS_MASK;
 
diff --git a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c
index f101895ecf4a..6ce00547c13e 100644
--- a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c
@@ -1565,11 +1565,15 @@ static int i40e_tso(struct sk_buff *skb, u8 *hdr_len, u64 *cd_type_cmd_tso_mss)
 	}
 
 	if (skb_shinfo(skb)->gso_type & (SKB_GSO_GRE |
+					 SKB_GSO_GRE_CSUM |
 					 SKB_GSO_IPIP |
 					 SKB_GSO_SIT |
 					 SKB_GSO_UDP_TUNNEL |
 					 SKB_GSO_UDP_TUNNEL_CSUM)) {
-		if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM) {
+		if (!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) &&
+		    (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM)) {
+			l4.udp->len = 0;
+
 			/* determine offset of outer transport header */
 			l4_offset = l4.hdr - skb->data;
 
@@ -1704,6 +1708,7 @@ static int i40e_tx_enable_csum(struct sk_buff *skb, u32 *tx_flags,
 
 		/* indicate if we need to offload outer UDP header */
 		if ((*tx_flags & I40E_TX_FLAGS_TSO) &&
+		    !(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) &&
 		    (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM))
 			tunnel |= I40E_TXD_CTX_QW0_L4T_CS_MASK;
 
diff --git a/drivers/net/ethernet/intel/i40evf/i40evf_main.c b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
index 806da2686623..42be838ce77e 100644
--- a/drivers/net/ethernet/intel/i40evf/i40evf_main.c
+++ b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
@@ -2346,20 +2346,25 @@ int i40evf_process_config(struct i40evf_adapter *adapter)
 				   NETIF_F_TSO_ECN		|
 				   NETIF_F_TSO6			|
 				   NETIF_F_GSO_GRE		|
+				   NETIF_F_GSO_GRE_CSUM		|
 				   NETIF_F_GSO_IPIP		|
 				   NETIF_F_GSO_SIT		|
 				   NETIF_F_GSO_UDP_TUNNEL	|
 				   NETIF_F_GSO_UDP_TUNNEL_CSUM	|
+				   NETIF_F_GSO_PARTIAL		|
 				   NETIF_F_SCTP_CRC		|
 				   NETIF_F_RXHASH		|
 				   NETIF_F_RXCSUM		|
 				   0;
 
 	if (!(adapter->flags & I40EVF_FLAG_OUTER_UDP_CSUM_CAPABLE))
-		netdev->hw_enc_features ^= NETIF_F_GSO_UDP_TUNNEL_CSUM;
+		netdev->gso_partial_features |= NETIF_F_GSO_UDP_TUNNEL_CSUM;
+
+	netdev->gso_partial_features |= NETIF_F_GSO_GRE_CSUM;
 
 	/* record features VLANs can make use of */
-	netdev->vlan_features |= netdev->hw_enc_features;
+	netdev->vlan_features |= netdev->hw_enc_features |
+				 NETIF_F_TSO_MANGLEID;
 
 	/* Write features and hw_features separately to avoid polluting
 	 * with, or dropping, features that are set when we registgered.
@@ -2367,6 +2372,7 @@ int i40evf_process_config(struct i40evf_adapter *adapter)
 	netdev->hw_features |= netdev->hw_enc_features;
 
 	netdev->features |= netdev->hw_enc_features | I40EVF_VLAN_FEATURES;
+	netdev->hw_enc_features |= NETIF_F_TSO_MANGLEID;
 
 	/* disable VLAN features if not supported */
 	if (!(vfres->vf_offload_flags & I40E_VIRTCHNL_VF_OFFLOAD_VLAN))

[Intel-wired-lan] [next-queue PATCH 1/3] i40e/i40evf: Add support for GSO partial with UDP_TUNNEL_CSUM and GRE_CSUM

[Alexander Duyck]

This patch makes it so that i40e and i40evf can use GSO_PARTIAL to support
segmentation for frames with checksums enabled in outer headers.  As a
result we can now send data over these types of tunnels at over 20Gb/s
versus the 12Gb/s that was previously possible on my system.

The advantage with the i40e parts is that this offload is mostly
transparent as the hardware still deals with the inner and/or outer IPv4
headers so the IP ID is still incrementing for both when this offload is
performed.

Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
---
 drivers/net/ethernet/intel/i40e/i40e_main.c     |   10 ++++++++--
 drivers/net/ethernet/intel/i40e/i40e_txrx.c     |    7 ++++++-
 drivers/net/ethernet/intel/i40evf/i40e_txrx.c   |    7 ++++++-
 drivers/net/ethernet/intel/i40evf/i40evf_main.c |   10 ++++++++--
 4 files changed, 28 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 07a70c4ac49f..6342fab4d177 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -9119,20 +9119,25 @@ static int i40e_config_netdev(struct i40e_vsi *vsi)
 				   NETIF_F_TSO_ECN		|
 				   NETIF_F_TSO6			|
 				   NETIF_F_GSO_GRE		|
+				   NETIF_F_GSO_GRE_CSUM		|
 				   NETIF_F_GSO_IPIP		|
 				   NETIF_F_GSO_SIT		|
 				   NETIF_F_GSO_UDP_TUNNEL	|
 				   NETIF_F_GSO_UDP_TUNNEL_CSUM	|
+				   NETIF_F_GSO_PARTIAL		|
 				   NETIF_F_SCTP_CRC		|
 				   NETIF_F_RXHASH		|
 				   NETIF_F_RXCSUM		|
 				   0;
 
 	if (!(pf->flags & I40E_FLAG_OUTER_UDP_CSUM_CAPABLE))
-		netdev->hw_enc_features ^= NETIF_F_GSO_UDP_TUNNEL_CSUM;
+		netdev->gso_partial_features |= NETIF_F_GSO_UDP_TUNNEL_CSUM;
+
+	netdev->gso_partial_features |= NETIF_F_GSO_GRE_CSUM;
 
 	/* record features VLANs can make use of */
-	netdev->vlan_features |= netdev->hw_enc_features;
+	netdev->vlan_features |= netdev->hw_enc_features |
+				 NETIF_F_TSO_MANGLEID;
 
 	if (!(pf->flags & I40E_FLAG_MFP_ENABLED))
 		netdev->hw_features |= NETIF_F_NTUPLE;
@@ -9142,6 +9147,7 @@ static int i40e_config_netdev(struct i40e_vsi *vsi)
 			       NETIF_F_HW_VLAN_CTAG_RX;
 
 	netdev->features |= netdev->hw_features | NETIF_F_HW_VLAN_CTAG_FILTER;
+	netdev->hw_enc_features |= NETIF_F_TSO_MANGLEID;
 
 	if (vsi->type == I40E_VSI_MAIN) {
 		SET_NETDEV_DEV(netdev, &pf->pdev->dev);
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index 6e44cf118843..ede4183468b9 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -2300,11 +2300,15 @@ static int i40e_tso(struct sk_buff *skb, u8 *hdr_len, u64 *cd_type_cmd_tso_mss)
 	}
 
 	if (skb_shinfo(skb)->gso_type & (SKB_GSO_GRE |
+					 SKB_GSO_GRE_CSUM |
 					 SKB_GSO_IPIP |
 					 SKB_GSO_SIT |
 					 SKB_GSO_UDP_TUNNEL |
 					 SKB_GSO_UDP_TUNNEL_CSUM)) {
-		if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM) {
+		if (!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) &&
+		    (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM)) {
+			l4.udp->len = 0;
+
 			/* determine offset of outer transport header */
 			l4_offset = l4.hdr - skb->data;
 
@@ -2481,6 +2485,7 @@ static int i40e_tx_enable_csum(struct sk_buff *skb, u32 *tx_flags,
 
 		/* indicate if we need to offload outer UDP header */
 		if ((*tx_flags & I40E_TX_FLAGS_TSO) &&
+		    !(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) &&
 		    (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM))
 			tunnel |= I40E_TXD_CTX_QW0_L4T_CS_MASK;
 
diff --git a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c
index f101895ecf4a..6ce00547c13e 100644
--- a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c
@@ -1565,11 +1565,15 @@ static int i40e_tso(struct sk_buff *skb, u8 *hdr_len, u64 *cd_type_cmd_tso_mss)
 	}
 
 	if (skb_shinfo(skb)->gso_type & (SKB_GSO_GRE |
+					 SKB_GSO_GRE_CSUM |
 					 SKB_GSO_IPIP |
 					 SKB_GSO_SIT |
 					 SKB_GSO_UDP_TUNNEL |
 					 SKB_GSO_UDP_TUNNEL_CSUM)) {
-		if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM) {
+		if (!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) &&
+		    (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM)) {
+			l4.udp->len = 0;
+
 			/* determine offset of outer transport header */
 			l4_offset = l4.hdr - skb->data;
 
@@ -1704,6 +1708,7 @@ static int i40e_tx_enable_csum(struct sk_buff *skb, u32 *tx_flags,
 
 		/* indicate if we need to offload outer UDP header */
 		if ((*tx_flags & I40E_TX_FLAGS_TSO) &&
+		    !(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) &&
 		    (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM))
 			tunnel |= I40E_TXD_CTX_QW0_L4T_CS_MASK;
 
diff --git a/drivers/net/ethernet/intel/i40evf/i40evf_main.c b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
index 806da2686623..42be838ce77e 100644
--- a/drivers/net/ethernet/intel/i40evf/i40evf_main.c
+++ b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
@@ -2346,20 +2346,25 @@ int i40evf_process_config(struct i40evf_adapter *adapter)
 				   NETIF_F_TSO_ECN		|
 				   NETIF_F_TSO6			|
 				   NETIF_F_GSO_GRE		|
+				   NETIF_F_GSO_GRE_CSUM		|
 				   NETIF_F_GSO_IPIP		|
 				   NETIF_F_GSO_SIT		|
 				   NETIF_F_GSO_UDP_TUNNEL	|
 				   NETIF_F_GSO_UDP_TUNNEL_CSUM	|
+				   NETIF_F_GSO_PARTIAL		|
 				   NETIF_F_SCTP_CRC		|
 				   NETIF_F_RXHASH		|
 				   NETIF_F_RXCSUM		|
 				   0;
 
 	if (!(adapter->flags & I40EVF_FLAG_OUTER_UDP_CSUM_CAPABLE))
-		netdev->hw_enc_features ^= NETIF_F_GSO_UDP_TUNNEL_CSUM;
+		netdev->gso_partial_features |= NETIF_F_GSO_UDP_TUNNEL_CSUM;
+
+	netdev->gso_partial_features |= NETIF_F_GSO_GRE_CSUM;
 
 	/* record features VLANs can make use of */
-	netdev->vlan_features |= netdev->hw_enc_features;
+	netdev->vlan_features |= netdev->hw_enc_features |
+				 NETIF_F_TSO_MANGLEID;
 
 	/* Write features and hw_features separately to avoid polluting
 	 * with, or dropping, features that are set when we registgered.
@@ -2367,6 +2372,7 @@ int i40evf_process_config(struct i40evf_adapter *adapter)
 	netdev->hw_features |= netdev->hw_enc_features;
 
 	netdev->features |= netdev->hw_enc_features | I40EVF_VLAN_FEATURES;
+	netdev->hw_enc_features |= NETIF_F_TSO_MANGLEID;
 
 	/* disable VLAN features if not supported */
 	if (!(vfres->vf_offload_flags & I40E_VIRTCHNL_VF_OFFLOAD_VLAN))

Re: [next-queue PATCH 1/3] i40e/i40evf: Add support for GSO partial with UDP_TUNNEL_CSUM and GRE_CSUM

[Jeff Kirsher]

[-- Attachment #1: Type: text/plain, Size: 6698 bytes --]

On Fri, 2016-04-08 at 17:06 -0400, Alexander Duyck wrote:
> This patch makes it so that i40e and i40evf can use GSO_PARTIAL to
> support
> segmentation for frames with checksums enabled in outer headers.  As
> a
> result we can now send data over these types of tunnels at over
> 20Gb/s
> versus the 12Gb/s that was previously possible on my system.
> 
> The advantage with the i40e parts is that this offload is mostly
> transparent as the hardware still deals with the inner and/or outer
> IPv4
> headers so the IP ID is still incrementing for both when this offload
> is
> performed.
> 
> Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
> ---
>  drivers/net/ethernet/intel/i40e/i40e_main.c     |   10 ++++++++--
>  drivers/net/ethernet/intel/i40e/i40e_txrx.c     |    7 ++++++-
>  drivers/net/ethernet/intel/i40evf/i40e_txrx.c   |    7 ++++++-
>  drivers/net/ethernet/intel/i40evf/i40evf_main.c |   10 ++++++++--
>  4 files changed, 28 insertions(+), 6 deletions(-)

Dropping this patch because it does not even compile...

[23:49:07 @jtkirshe-linux:next-queue]$ make -j 77 -s
Makefile:679: Cannot use CONFIG_KCOV: -fsanitize-coverage=trace-pc is
not supported by compiler
  DESCEND  objtool
drivers/net/ethernet/intel/i40evf/i40evf_main.c: In function
‘i40evf_process_config’:
drivers/net/ethernet/intel/i40evf/i40evf_main.c:2354:8: error:
‘NETIF_F_GSO_PARTIAL’ undeclared (first use in this function)
        NETIF_F_GSO_PARTIAL  |
        ^
drivers/net/ethernet/intel/i40evf/i40evf_main.c:2354:8: note: each
undeclared identifier is reported only once for each function it
appears in
drivers/net/ethernet/intel/i40evf/i40evf_main.c:2361:9: error: ‘struct
net_device’ has no member named ‘gso_partial_features’
   netdev->gso_partial_features |= NETIF_F_GSO_UDP_TUNNEL_CSUM;
         ^
drivers/net/ethernet/intel/i40evf/i40evf_main.c:2363:8: error: ‘struct
net_device’ has no member named ‘gso_partial_features’
  netdev->gso_partial_features |= NETIF_F_GSO_GRE_CSUM;
        ^
drivers/net/ethernet/intel/i40evf/i40evf_main.c:2367:6: error:
‘NETIF_F_TSO_MANGLEID’ undeclared (first use in this function)
      NETIF_F_TSO_MANGLEID;
      ^
drivers/net/ethernet/intel/i40evf/i40e_txrx.c: In function ‘i40e_tso’:
drivers/net/ethernet/intel/i40evf/i40e_txrx.c:1573:37: error:
‘SKB_GSO_PARTIAL’ undeclared (first use in this function)
   if (!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) &&
                                     ^
drivers/net/ethernet/intel/i40evf/i40e_txrx.c:1573:37: note: each
undeclared identifier is reported only once for each function it
appears in
drivers/net/ethernet/intel/i40evf/i40e_txrx.c: In function
‘i40e_tx_enable_csum’:
drivers/net/ethernet/intel/i40evf/i40e_txrx.c:1711:37: error:
‘SKB_GSO_PARTIAL’ undeclared (first use in this function)
       !(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) &&
                                     ^
scripts/Makefile.build:291: recipe for target
'drivers/net/ethernet/intel/i40evf/i40evf_main.o' failed
make[5]: *** [drivers/net/ethernet/intel/i40evf/i40evf_main.o] Error 1
make[5]: *** Waiting for unfinished jobs....
scripts/Makefile.build:291: recipe for target
'drivers/net/ethernet/intel/i40evf/i40e_txrx.o' failed
make[5]: *** [drivers/net/ethernet/intel/i40evf/i40e_txrx.o] Error 1
scripts/Makefile.build:440: recipe for target
'drivers/net/ethernet/intel/i40evf' failed
make[4]: *** [drivers/net/ethernet/intel/i40evf] Error 2
make[4]: *** Waiting for unfinished jobs....
drivers/net/ethernet/intel/i40e/i40e_main.c: In function
‘i40e_config_netdev’:
drivers/net/ethernet/intel/i40e/i40e_main.c:9127:8: error:
‘NETIF_F_GSO_PARTIAL’ undeclared (first use in this function)
        NETIF_F_GSO_PARTIAL  |
        ^
drivers/net/ethernet/intel/i40e/i40e_main.c:9127:8: note: each
undeclared identifier is reported only once for each function it
appears in
drivers/net/ethernet/intel/i40e/i40e_main.c:9134:9: error: ‘struct
net_device’ has no member named ‘gso_partial_features’
   netdev->gso_partial_features |= NETIF_F_GSO_UDP_TUNNEL_CSUM;
         ^
drivers/net/ethernet/intel/i40e/i40e_main.c:9136:8: error: ‘struct
net_device’ has no member named ‘gso_partial_features’
  netdev->gso_partial_features |= NETIF_F_GSO_GRE_CSUM;
        ^
drivers/net/ethernet/intel/i40e/i40e_main.c:9140:6: error:
‘NETIF_F_TSO_MANGLEID’ undeclared (first use in this function)
      NETIF_F_TSO_MANGLEID;
      ^
scripts/Makefile.build:291: recipe for target
'drivers/net/ethernet/intel/i40e/i40e_main.o' failed
make[5]: *** [drivers/net/ethernet/intel/i40e/i40e_main.o] Error 1
make[5]: *** Waiting for unfinished jobs....
drivers/net/ethernet/intel/i40e/i40e_txrx.c: In function ‘i40e_tso’:
drivers/net/ethernet/intel/i40e/i40e_txrx.c:2308:37: error:
‘SKB_GSO_PARTIAL’ undeclared (first use in this function)
   if (!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) &&
                                     ^
drivers/net/ethernet/intel/i40e/i40e_txrx.c:2308:37: note: each
undeclared identifier is reported only once for each function it
appears in
drivers/net/ethernet/intel/i40e/i40e_txrx.c: In function
‘i40e_tx_enable_csum’:
drivers/net/ethernet/intel/i40e/i40e_txrx.c:2488:37: error:
‘SKB_GSO_PARTIAL’ undeclared (first use in this function)
       !(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) &&
                                     ^
scripts/Makefile.build:291: recipe for target
'drivers/net/ethernet/intel/i40e/i40e_txrx.o' failed
make[5]: *** [drivers/net/ethernet/intel/i40e/i40e_txrx.o] Error 1
scripts/Makefile.build:440: recipe for target
'drivers/net/ethernet/intel/i40e' failed
make[4]: *** [drivers/net/ethernet/intel/i40e] Error 2
scripts/Makefile.build:440: recipe for target
'drivers/net/ethernet/intel' failed
make[3]: *** [drivers/net/ethernet/intel] Error 2
make[3]: *** Waiting for unfinished jobs....
scripts/Makefile.build:440: recipe for target 'drivers/net/ethernet'
failed
make[2]: *** [drivers/net/ethernet] Error 2
scripts/Makefile.build:440: recipe for target 'drivers/net' failed
make[1]: *** [drivers/net] Error 2
make[1]: *** Waiting for unfinished jobs....
Makefile:962: recipe for target 'drivers' failed
make: *** [drivers] Error 2
make: *** Waiting for unfinished jobs....

[-- Attachment #2: This is a digitally signed message part --]
[-- Type: application/pgp-signature, Size: 819 bytes --]

[Intel-wired-lan] [next-queue PATCH 1/3] i40e/i40evf: Add support for GSO partial with UDP_TUNNEL_CSUM and GRE_CSUM

[Jeff Kirsher]

On Fri, 2016-04-08 at 17:06 -0400, Alexander Duyck wrote:
> This patch makes it so that i40e and i40evf can use GSO_PARTIAL to
> support
> segmentation for frames with checksums enabled in outer headers.? As
> a
> result we can now send data over these types of tunnels at over
> 20Gb/s
> versus the 12Gb/s that was previously possible on my system.
> 
> The advantage with the i40e parts is that this offload is mostly
> transparent as the hardware still deals with the inner and/or outer
> IPv4
> headers so the IP ID is still incrementing for both when this offload
> is
> performed.
> 
> Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
> ---
> ?drivers/net/ethernet/intel/i40e/i40e_main.c???? |?? 10 ++++++++--
> ?drivers/net/ethernet/intel/i40e/i40e_txrx.c???? |??? 7 ++++++-
> ?drivers/net/ethernet/intel/i40evf/i40e_txrx.c?? |??? 7 ++++++-
> ?drivers/net/ethernet/intel/i40evf/i40evf_main.c |?? 10 ++++++++--
> ?4 files changed, 28 insertions(+), 6 deletions(-)

Dropping this patch because it does not even compile...

[23:49:07 @jtkirshe-linux:next-queue]$ make -j 77 -s
Makefile:679: Cannot use CONFIG_KCOV: -fsanitize-coverage=trace-pc is
not supported by compiler
? DESCEND??objtool
drivers/net/ethernet/intel/i40evf/i40evf_main.c: In function
?i40evf_process_config?:
drivers/net/ethernet/intel/i40evf/i40evf_main.c:2354:8: error:
?NETIF_F_GSO_PARTIAL? undeclared (first use in this function)
????????NETIF_F_GSO_PARTIAL??|
????????^
drivers/net/ethernet/intel/i40evf/i40evf_main.c:2354:8: note: each
undeclared identifier is reported only once for each function it
appears in
drivers/net/ethernet/intel/i40evf/i40evf_main.c:2361:9: error: ?struct
net_device? has no member named ?gso_partial_features?
???netdev->gso_partial_features |= NETIF_F_GSO_UDP_TUNNEL_CSUM;
?????????^
drivers/net/ethernet/intel/i40evf/i40evf_main.c:2363:8: error: ?struct
net_device? has no member named ?gso_partial_features?
? netdev->gso_partial_features |= NETIF_F_GSO_GRE_CSUM;
????????^
drivers/net/ethernet/intel/i40evf/i40evf_main.c:2367:6: error:
?NETIF_F_TSO_MANGLEID? undeclared (first use in this function)
??????NETIF_F_TSO_MANGLEID;
??????^
drivers/net/ethernet/intel/i40evf/i40e_txrx.c: In function ?i40e_tso?:
drivers/net/ethernet/intel/i40evf/i40e_txrx.c:1573:37: error:
?SKB_GSO_PARTIAL? undeclared (first use in this function)
???if (!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) &&
?????????????????????????????????????^
drivers/net/ethernet/intel/i40evf/i40e_txrx.c:1573:37: note: each
undeclared identifier is reported only once for each function it
appears in
drivers/net/ethernet/intel/i40evf/i40e_txrx.c: In function
?i40e_tx_enable_csum?:
drivers/net/ethernet/intel/i40evf/i40e_txrx.c:1711:37: error:
?SKB_GSO_PARTIAL? undeclared (first use in this function)
???????!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) &&
?????????????????????????????????????^
scripts/Makefile.build:291: recipe for target
'drivers/net/ethernet/intel/i40evf/i40evf_main.o' failed
make[5]: *** [drivers/net/ethernet/intel/i40evf/i40evf_main.o] Error 1
make[5]: *** Waiting for unfinished jobs....
scripts/Makefile.build:291: recipe for target
'drivers/net/ethernet/intel/i40evf/i40e_txrx.o' failed
make[5]: *** [drivers/net/ethernet/intel/i40evf/i40e_txrx.o] Error 1
scripts/Makefile.build:440: recipe for target
'drivers/net/ethernet/intel/i40evf' failed
make[4]: *** [drivers/net/ethernet/intel/i40evf] Error 2
make[4]: *** Waiting for unfinished jobs....
drivers/net/ethernet/intel/i40e/i40e_main.c: In function
?i40e_config_netdev?:
drivers/net/ethernet/intel/i40e/i40e_main.c:9127:8: error:
?NETIF_F_GSO_PARTIAL? undeclared (first use in this function)
????????NETIF_F_GSO_PARTIAL??|
????????^
drivers/net/ethernet/intel/i40e/i40e_main.c:9127:8: note: each
undeclared identifier is reported only once for each function it
appears in
drivers/net/ethernet/intel/i40e/i40e_main.c:9134:9: error: ?struct
net_device? has no member named ?gso_partial_features?
???netdev->gso_partial_features |= NETIF_F_GSO_UDP_TUNNEL_CSUM;
?????????^
drivers/net/ethernet/intel/i40e/i40e_main.c:9136:8: error: ?struct
net_device? has no member named ?gso_partial_features?
? netdev->gso_partial_features |= NETIF_F_GSO_GRE_CSUM;
????????^
drivers/net/ethernet/intel/i40e/i40e_main.c:9140:6: error:
?NETIF_F_TSO_MANGLEID? undeclared (first use in this function)
??????NETIF_F_TSO_MANGLEID;
??????^
scripts/Makefile.build:291: recipe for target
'drivers/net/ethernet/intel/i40e/i40e_main.o' failed
make[5]: *** [drivers/net/ethernet/intel/i40e/i40e_main.o] Error 1
make[5]: *** Waiting for unfinished jobs....
drivers/net/ethernet/intel/i40e/i40e_txrx.c: In function ?i40e_tso?:
drivers/net/ethernet/intel/i40e/i40e_txrx.c:2308:37: error:
?SKB_GSO_PARTIAL? undeclared (first use in this function)
???if (!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) &&
?????????????????????????????????????^
drivers/net/ethernet/intel/i40e/i40e_txrx.c:2308:37: note: each
undeclared identifier is reported only once for each function it
appears in
drivers/net/ethernet/intel/i40e/i40e_txrx.c: In function
?i40e_tx_enable_csum?:
drivers/net/ethernet/intel/i40e/i40e_txrx.c:2488:37: error:
?SKB_GSO_PARTIAL? undeclared (first use in this function)
???????!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) &&
?????????????????????????????????????^
scripts/Makefile.build:291: recipe for target
'drivers/net/ethernet/intel/i40e/i40e_txrx.o' failed
make[5]: *** [drivers/net/ethernet/intel/i40e/i40e_txrx.o] Error 1
scripts/Makefile.build:440: recipe for target
'drivers/net/ethernet/intel/i40e' failed
make[4]: *** [drivers/net/ethernet/intel/i40e] Error 2
scripts/Makefile.build:440: recipe for target
'drivers/net/ethernet/intel' failed
make[3]: *** [drivers/net/ethernet/intel] Error 2
make[3]: *** Waiting for unfinished jobs....
scripts/Makefile.build:440: recipe for target 'drivers/net/ethernet'
failed
make[2]: *** [drivers/net/ethernet] Error 2
scripts/Makefile.build:440: recipe for target 'drivers/net' failed
make[1]: *** [drivers/net] Error 2
make[1]: *** Waiting for unfinished jobs....
Makefile:962: recipe for target 'drivers' failed
make: *** [drivers] Error 2
make: *** Waiting for unfinished jobs....
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[next-queue PATCH 2/3] ixgbe/ixgbevf: Add support for GSO partial

[Alexander Duyck]

This patch adds support for partial GSO segmentation in the case of
tunnels.  Specifically with this change the driver an perform segmenation
as long as the frame either has IPv6 inner headers, or we are allowed to
mangle the IP IDs on the inner header.  This is needed because we will not
be modifying any fields from the start of the start of the outer transport
header to the start of the inner transport header as we are treating them
like they are just a block of IP options.

Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c     |  105 +++++++++++++-----
 drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c |  123 ++++++++++++++++-----
 2 files changed, 172 insertions(+), 56 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 974aa7ca7a12..5134cb97f33c 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -7216,9 +7216,18 @@ static int ixgbe_tso(struct ixgbe_ring *tx_ring,
 		     struct ixgbe_tx_buffer *first,
 		     u8 *hdr_len)
 {
+	u32 vlan_macip_lens, type_tucmd, mss_l4len_idx;
 	struct sk_buff *skb = first->skb;
-	u32 vlan_macip_lens, type_tucmd;
-	u32 mss_l4len_idx, l4len;
+	union {
+		struct iphdr *v4;
+		struct ipv6hdr *v6;
+		unsigned char *hdr;
+	} ip;
+	union {
+		struct tcphdr *tcp;
+		unsigned char *hdr;
+	} l4;
+	u32 paylen, l4_offset;
 	int err;
 
 	if (skb->ip_summed != CHECKSUM_PARTIAL)
@@ -7231,46 +7240,52 @@ static int ixgbe_tso(struct ixgbe_ring *tx_ring,
 	if (err < 0)
 		return err;
 
+	ip.hdr = skb_network_header(skb);
+	l4.hdr = skb_checksum_start(skb);
+
 	/* ADV DTYP TUCMD MKRLOC/ISCSIHEDLEN */
 	type_tucmd = IXGBE_ADVTXD_TUCMD_L4T_TCP;
 
-	if (first->protocol == htons(ETH_P_IP)) {
-		struct iphdr *iph = ip_hdr(skb);
-		iph->tot_len = 0;
-		iph->check = 0;
-		tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
-							 iph->daddr, 0,
-							 IPPROTO_TCP,
-							 0);
+	/* initialize outer IP header fields */
+	if (ip.v4->version == 4) {
+		/* IP header will have to cancel out any data that
+		 * is not a part of the outer IP header
+		 */
+		ip.v4->check = csum_fold(csum_add(lco_csum(skb),
+						  csum_unfold(l4.tcp->check)));
 		type_tucmd |= IXGBE_ADVTXD_TUCMD_IPV4;
+
+		ip.v4->tot_len = 0;
 		first->tx_flags |= IXGBE_TX_FLAGS_TSO |
 				   IXGBE_TX_FLAGS_CSUM |
 				   IXGBE_TX_FLAGS_IPV4;
-	} else if (skb_is_gso_v6(skb)) {
-		ipv6_hdr(skb)->payload_len = 0;
-		tcp_hdr(skb)->check =
-		    ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
-				     &ipv6_hdr(skb)->daddr,
-				     0, IPPROTO_TCP, 0);
+	} else {
+		ip.v6->payload_len = 0;
 		first->tx_flags |= IXGBE_TX_FLAGS_TSO |
 				   IXGBE_TX_FLAGS_CSUM;
 	}
 
-	/* compute header lengths */
-	l4len = tcp_hdrlen(skb);
-	*hdr_len = skb_transport_offset(skb) + l4len;
+	/* determine offset of inner transport header */
+	l4_offset = l4.hdr - skb->data;
+
+	/* compute length of segmentation header */
+	*hdr_len = (l4.tcp->doff * 4) + l4_offset;
+
+	/* remove payload length from inner checksum */
+	paylen = skb->len - l4_offset;
+	csum_replace_by_diff(&l4.tcp->check, htonl(paylen));
 
 	/* update gso size and bytecount with header size */
 	first->gso_segs = skb_shinfo(skb)->gso_segs;
 	first->bytecount += (first->gso_segs - 1) * *hdr_len;
 
 	/* mss_l4len_id: use 0 as index for TSO */
-	mss_l4len_idx = l4len << IXGBE_ADVTXD_L4LEN_SHIFT;
+	mss_l4len_idx = (*hdr_len - l4_offset) << IXGBE_ADVTXD_L4LEN_SHIFT;
 	mss_l4len_idx |= skb_shinfo(skb)->gso_size << IXGBE_ADVTXD_MSS_SHIFT;
 
 	/* vlan_macip_lens: HEADLEN, MACLEN, VLAN tag */
-	vlan_macip_lens = skb_network_header_len(skb);
-	vlan_macip_lens |= skb_network_offset(skb) << IXGBE_ADVTXD_MACLEN_SHIFT;
+	vlan_macip_lens = l4.hdr - ip.hdr;
+	vlan_macip_lens |= (ip.hdr - skb->data) << IXGBE_ADVTXD_MACLEN_SHIFT;
 	vlan_macip_lens |= first->tx_flags & IXGBE_TX_FLAGS_VLAN_MASK;
 
 	ixgbe_tx_ctxtdesc(tx_ring, vlan_macip_lens, 0, type_tucmd,
@@ -8614,6 +8629,14 @@ static int ixgbe_set_features(struct net_device *netdev,
 	if (changed & NETIF_F_RXALL)
 		need_reset = true;
 
+	/* We can only support IPV4 TSO in tunnels if we can mangle the
+	 * inner IP ID field, so strip TSO if MANGLEID is not supported.
+	 */
+	if (features & NETIF_F_TSO_MANGLEID)
+		netdev->hw_enc_features |= NETIF_F_TSO;
+	else
+		netdev->hw_enc_features &= ~NETIF_F_TSO;
+
 	netdev->features = features;
 
 #ifdef CONFIG_IXGBE_VXLAN
@@ -8927,17 +8950,25 @@ static void ixgbe_fwd_del(struct net_device *pdev, void *priv)
 	kfree(fwd_adapter);
 }
 
-#define IXGBE_MAX_TUNNEL_HDR_LEN 80
+#define IXGBE_MAX_MAC_HDR_LEN		127
+#define IXGBE_MAX_NETWORK_HDR_LEN	511
+
 static netdev_features_t
 ixgbe_features_check(struct sk_buff *skb, struct net_device *dev,
 		     netdev_features_t features)
 {
-	if (!skb->encapsulation)
-		return features;
+	unsigned int network_hdr_len, mac_hdr_len;
 
-	if (unlikely(skb_inner_mac_header(skb) - skb_transport_header(skb) >
-		     IXGBE_MAX_TUNNEL_HDR_LEN))
-		return features & ~NETIF_F_CSUM_MASK;
+	/* Make certain the headers can be described by a context descriptor */
+	mac_hdr_len = skb_network_header(skb) - skb->data;
+	network_hdr_len = skb_checksum_start(skb) - skb_network_header(skb);
+	if (unlikely((mac_hdr_len > IXGBE_MAX_MAC_HDR_LEN) ||
+		     (network_hdr_len >  IXGBE_MAX_NETWORK_HDR_LEN)))
+		return features & ~(NETIF_F_HW_CSUM |
+				    NETIF_F_SCTP_CRC |
+				    NETIF_F_HW_VLAN_CTAG_TX |
+				    NETIF_F_TSO |
+				    NETIF_F_TSO6);
 
 	return features;
 }
@@ -9309,6 +9340,17 @@ skip_sriov:
 			   NETIF_F_HW_VLAN_CTAG_RX |
 			   NETIF_F_HW_VLAN_CTAG_FILTER;
 
+#define IXGBE_GSO_PARTIAL_FEATURES (NETIF_F_GSO_GRE | \
+				    NETIF_F_GSO_GRE_CSUM | \
+				    NETIF_F_GSO_IPIP | \
+				    NETIF_F_GSO_SIT | \
+				    NETIF_F_GSO_UDP_TUNNEL | \
+				    NETIF_F_GSO_UDP_TUNNEL_CSUM)
+
+	netdev->gso_partial_features = IXGBE_GSO_PARTIAL_FEATURES;
+	netdev->features |= NETIF_F_GSO_PARTIAL |
+			    IXGBE_GSO_PARTIAL_FEATURES;
+
 	if (hw->mac.type >= ixgbe_mac_82599EB)
 		netdev->features |= NETIF_F_SCTP_CRC;
 
@@ -9323,12 +9365,17 @@ skip_sriov:
 
 	netdev->vlan_features |= NETIF_F_SG |
 				 NETIF_F_TSO |
+				 NETIF_F_TSO_MANGLEID |
 				 NETIF_F_TSO6 |
 				 NETIF_F_HW_CSUM |
 				 NETIF_F_SCTP_CRC;
 
 	netdev->mpls_features |= NETIF_F_HW_CSUM;
-	netdev->hw_enc_features |= NETIF_F_HW_CSUM;
+	netdev->hw_enc_features |= NETIF_F_HW_CSUM |
+				   NETIF_F_TSO_MANGLEID |
+				   NETIF_F_TSO6 |
+				   NETIF_F_GSO_PARTIAL |
+				   IXGBE_GSO_PARTIAL_FEATURES;
 
 	netdev->priv_flags |= IFF_UNICAST_FLT;
 	netdev->priv_flags |= IFF_SUPP_NOFCS;
diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
index 007cbe094990..e4f471787dd4 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
@@ -3272,9 +3272,18 @@ static int ixgbevf_tso(struct ixgbevf_ring *tx_ring,
 		       struct ixgbevf_tx_buffer *first,
 		       u8 *hdr_len)
 {
+	u32 vlan_macip_lens, type_tucmd, mss_l4len_idx;
 	struct sk_buff *skb = first->skb;
-	u32 vlan_macip_lens, type_tucmd;
-	u32 mss_l4len_idx, l4len;
+	union {
+		struct iphdr *v4;
+		struct ipv6hdr *v6;
+		unsigned char *hdr;
+	} ip;
+	union {
+		struct tcphdr *tcp;
+		unsigned char *hdr;
+	} l4;
+	u32 paylen, l4_offset;
 	int err;
 
 	if (skb->ip_summed != CHECKSUM_PARTIAL)
@@ -3287,49 +3296,53 @@ static int ixgbevf_tso(struct ixgbevf_ring *tx_ring,
 	if (err < 0)
 		return err;
 
+	ip.hdr = skb_network_header(skb);
+	l4.hdr = skb_checksum_start(skb);
+
 	/* ADV DTYP TUCMD MKRLOC/ISCSIHEDLEN */
 	type_tucmd = IXGBE_ADVTXD_TUCMD_L4T_TCP;
 
-	if (first->protocol == htons(ETH_P_IP)) {
-		struct iphdr *iph = ip_hdr(skb);
-
-		iph->tot_len = 0;
-		iph->check = 0;
-		tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
-							 iph->daddr, 0,
-							 IPPROTO_TCP,
-							 0);
+	/* initialize outer IP header fields */
+	if (ip.v4->version == 4) {
+		/* IP header will have to cancel out any data that
+		 * is not a part of the outer IP header
+		 */
+		ip.v4->check = csum_fold(csum_add(lco_csum(skb),
+						  csum_unfold(l4.tcp->check)));
 		type_tucmd |= IXGBE_ADVTXD_TUCMD_IPV4;
+
+		ip.v4->tot_len = 0;
 		first->tx_flags |= IXGBE_TX_FLAGS_TSO |
 				   IXGBE_TX_FLAGS_CSUM |
 				   IXGBE_TX_FLAGS_IPV4;
-	} else if (skb_is_gso_v6(skb)) {
-		ipv6_hdr(skb)->payload_len = 0;
-		tcp_hdr(skb)->check =
-		    ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
-				     &ipv6_hdr(skb)->daddr,
-				     0, IPPROTO_TCP, 0);
+	} else {
+		ip.v6->payload_len = 0;
 		first->tx_flags |= IXGBE_TX_FLAGS_TSO |
 				   IXGBE_TX_FLAGS_CSUM;
 	}
 
-	/* compute header lengths */
-	l4len = tcp_hdrlen(skb);
-	*hdr_len += l4len;
-	*hdr_len = skb_transport_offset(skb) + l4len;
+	/* determine offset of inner transport header */
+	l4_offset = l4.hdr - skb->data;
+
+	/* compute length of segmentation header */
+	*hdr_len = (l4.tcp->doff * 4) + l4_offset;
 
-	/* update GSO size and bytecount with header size */
+	/* remove payload length from inner checksum */
+	paylen = skb->len - l4_offset;
+	csum_replace_by_diff(&l4.tcp->check, htonl(paylen));
+
+	/* update gso size and bytecount with header size */
 	first->gso_segs = skb_shinfo(skb)->gso_segs;
 	first->bytecount += (first->gso_segs - 1) * *hdr_len;
 
 	/* mss_l4len_id: use 1 as index for TSO */
-	mss_l4len_idx = l4len << IXGBE_ADVTXD_L4LEN_SHIFT;
+	mss_l4len_idx = (*hdr_len - l4_offset) << IXGBE_ADVTXD_L4LEN_SHIFT;
 	mss_l4len_idx |= skb_shinfo(skb)->gso_size << IXGBE_ADVTXD_MSS_SHIFT;
 	mss_l4len_idx |= 1 << IXGBE_ADVTXD_IDX_SHIFT;
 
 	/* vlan_macip_lens: HEADLEN, MACLEN, VLAN tag */
-	vlan_macip_lens = skb_network_header_len(skb);
-	vlan_macip_lens |= skb_network_offset(skb) << IXGBE_ADVTXD_MACLEN_SHIFT;
+	vlan_macip_lens = l4.hdr - ip.hdr;
+	vlan_macip_lens |= (ip.hdr - skb->data) << IXGBE_ADVTXD_MACLEN_SHIFT;
 	vlan_macip_lens |= first->tx_flags & IXGBE_TX_FLAGS_VLAN_MASK;
 
 	ixgbevf_tx_ctxtdesc(tx_ring, vlan_macip_lens,
@@ -3870,6 +3883,45 @@ static struct rtnl_link_stats64 *ixgbevf_get_stats(struct net_device *netdev,
 	return stats;
 }
 
+static int ixgbevf_set_features(struct net_device *netdev,
+				netdev_features_t features)
+{
+	/* We can only support IPV4 TSO in tunnels if we can mangle the
+	 * inner IP ID field, so strip TSO if MANGLEID is not supported.
+	 */
+	if (features & NETIF_F_TSO_MANGLEID)
+		netdev->hw_enc_features |= NETIF_F_TSO;
+	else
+		netdev->hw_enc_features &= ~NETIF_F_TSO;
+
+	netdev->features = features;
+
+	return 0;
+}
+
+#define IXGBEVF_MAX_MAC_HDR_LEN		127
+#define IXGBEVF_MAX_NETWORK_HDR_LEN	511
+
+static netdev_features_t
+ixgbevf_features_check(struct sk_buff *skb, struct net_device *dev,
+		       netdev_features_t features)
+{
+	unsigned int network_hdr_len, mac_hdr_len;
+
+	/* Make certain the headers can be described by a context descriptor */
+	mac_hdr_len = skb_network_header(skb) - skb->data;
+	network_hdr_len = skb_checksum_start(skb) - skb_network_header(skb);
+	if (unlikely((mac_hdr_len > IXGBEVF_MAX_MAC_HDR_LEN) ||
+		     (network_hdr_len >  IXGBEVF_MAX_NETWORK_HDR_LEN)))
+		return features & ~(NETIF_F_HW_CSUM |
+				    NETIF_F_SCTP_CRC |
+				    NETIF_F_HW_VLAN_CTAG_TX |
+				    NETIF_F_TSO |
+				    NETIF_F_TSO6);
+
+	return features;
+}
+
 static const struct net_device_ops ixgbevf_netdev_ops = {
 	.ndo_open		= ixgbevf_open,
 	.ndo_stop		= ixgbevf_close,
@@ -3888,7 +3940,8 @@ static const struct net_device_ops ixgbevf_netdev_ops = {
 #ifdef CONFIG_NET_POLL_CONTROLLER
 	.ndo_poll_controller	= ixgbevf_netpoll,
 #endif
-	.ndo_features_check	= passthru_features_check,
+	.ndo_set_features	= ixgbevf_set_features,
+	.ndo_features_check	= ixgbevf_features_check,
 };
 
 static void ixgbevf_assign_netdev_ops(struct net_device *dev)
@@ -3999,6 +4052,17 @@ static int ixgbevf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 			      NETIF_F_HW_CSUM |
 			      NETIF_F_SCTP_CRC;
 
+#define IXGBEVF_GSO_PARTIAL_FEATURES (NETIF_F_GSO_GRE | \
+				      NETIF_F_GSO_GRE_CSUM | \
+				      NETIF_F_GSO_IPIP | \
+				      NETIF_F_GSO_SIT | \
+				      NETIF_F_GSO_UDP_TUNNEL | \
+				      NETIF_F_GSO_UDP_TUNNEL_CSUM)
+
+	netdev->gso_partial_features = IXGBEVF_GSO_PARTIAL_FEATURES;
+	netdev->hw_features |= NETIF_F_GSO_PARTIAL |
+			       IXGBEVF_GSO_PARTIAL_FEATURES;
+
 	netdev->features = netdev->hw_features |
 			   NETIF_F_HW_VLAN_CTAG_TX |
 			   NETIF_F_HW_VLAN_CTAG_RX |
@@ -4006,12 +4070,17 @@ static int ixgbevf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	netdev->vlan_features |= NETIF_F_SG |
 				 NETIF_F_TSO |
+				 NETIF_F_TSO_MANGLEID |
 				 NETIF_F_TSO6 |
 				 NETIF_F_HW_CSUM |
 				 NETIF_F_SCTP_CRC;
 
 	netdev->mpls_features |= NETIF_F_HW_CSUM;
-	netdev->hw_enc_features |= NETIF_F_HW_CSUM;
+	netdev->hw_enc_features |= NETIF_F_HW_CSUM |
+				   NETIF_F_TSO_MANGLEID |
+				   NETIF_F_TSO6 |
+				   NETIF_F_GSO_PARTIAL |
+				   IXGBEVF_GSO_PARTIAL_FEATURES;
 
 	if (pci_using_dac)
 		netdev->features |= NETIF_F_HIGHDMA;

[Intel-wired-lan] [next-queue PATCH 2/3] ixgbe/ixgbevf: Add support for GSO partial

[Alexander Duyck]

This patch adds support for partial GSO segmentation in the case of
tunnels.  Specifically with this change the driver an perform segmenation
as long as the frame either has IPv6 inner headers, or we are allowed to
mangle the IP IDs on the inner header.  This is needed because we will not
be modifying any fields from the start of the start of the outer transport
header to the start of the inner transport header as we are treating them
like they are just a block of IP options.

Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c     |  105 +++++++++++++-----
 drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c |  123 ++++++++++++++++-----
 2 files changed, 172 insertions(+), 56 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 974aa7ca7a12..5134cb97f33c 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -7216,9 +7216,18 @@ static int ixgbe_tso(struct ixgbe_ring *tx_ring,
 		     struct ixgbe_tx_buffer *first,
 		     u8 *hdr_len)
 {
+	u32 vlan_macip_lens, type_tucmd, mss_l4len_idx;
 	struct sk_buff *skb = first->skb;
-	u32 vlan_macip_lens, type_tucmd;
-	u32 mss_l4len_idx, l4len;
+	union {
+		struct iphdr *v4;
+		struct ipv6hdr *v6;
+		unsigned char *hdr;
+	} ip;
+	union {
+		struct tcphdr *tcp;
+		unsigned char *hdr;
+	} l4;
+	u32 paylen, l4_offset;
 	int err;
 
 	if (skb->ip_summed != CHECKSUM_PARTIAL)
@@ -7231,46 +7240,52 @@ static int ixgbe_tso(struct ixgbe_ring *tx_ring,
 	if (err < 0)
 		return err;
 
+	ip.hdr = skb_network_header(skb);
+	l4.hdr = skb_checksum_start(skb);
+
 	/* ADV DTYP TUCMD MKRLOC/ISCSIHEDLEN */
 	type_tucmd = IXGBE_ADVTXD_TUCMD_L4T_TCP;
 
-	if (first->protocol == htons(ETH_P_IP)) {
-		struct iphdr *iph = ip_hdr(skb);
-		iph->tot_len = 0;
-		iph->check = 0;
-		tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
-							 iph->daddr, 0,
-							 IPPROTO_TCP,
-							 0);
+	/* initialize outer IP header fields */
+	if (ip.v4->version == 4) {
+		/* IP header will have to cancel out any data that
+		 * is not a part of the outer IP header
+		 */
+		ip.v4->check = csum_fold(csum_add(lco_csum(skb),
+						  csum_unfold(l4.tcp->check)));
 		type_tucmd |= IXGBE_ADVTXD_TUCMD_IPV4;
+
+		ip.v4->tot_len = 0;
 		first->tx_flags |= IXGBE_TX_FLAGS_TSO |
 				   IXGBE_TX_FLAGS_CSUM |
 				   IXGBE_TX_FLAGS_IPV4;
-	} else if (skb_is_gso_v6(skb)) {
-		ipv6_hdr(skb)->payload_len = 0;
-		tcp_hdr(skb)->check =
-		    ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
-				     &ipv6_hdr(skb)->daddr,
-				     0, IPPROTO_TCP, 0);
+	} else {
+		ip.v6->payload_len = 0;
 		first->tx_flags |= IXGBE_TX_FLAGS_TSO |
 				   IXGBE_TX_FLAGS_CSUM;
 	}
 
-	/* compute header lengths */
-	l4len = tcp_hdrlen(skb);
-	*hdr_len = skb_transport_offset(skb) + l4len;
+	/* determine offset of inner transport header */
+	l4_offset = l4.hdr - skb->data;
+
+	/* compute length of segmentation header */
+	*hdr_len = (l4.tcp->doff * 4) + l4_offset;
+
+	/* remove payload length from inner checksum */
+	paylen = skb->len - l4_offset;
+	csum_replace_by_diff(&l4.tcp->check, htonl(paylen));
 
 	/* update gso size and bytecount with header size */
 	first->gso_segs = skb_shinfo(skb)->gso_segs;
 	first->bytecount += (first->gso_segs - 1) * *hdr_len;
 
 	/* mss_l4len_id: use 0 as index for TSO */
-	mss_l4len_idx = l4len << IXGBE_ADVTXD_L4LEN_SHIFT;
+	mss_l4len_idx = (*hdr_len - l4_offset) << IXGBE_ADVTXD_L4LEN_SHIFT;
 	mss_l4len_idx |= skb_shinfo(skb)->gso_size << IXGBE_ADVTXD_MSS_SHIFT;
 
 	/* vlan_macip_lens: HEADLEN, MACLEN, VLAN tag */
-	vlan_macip_lens = skb_network_header_len(skb);
-	vlan_macip_lens |= skb_network_offset(skb) << IXGBE_ADVTXD_MACLEN_SHIFT;
+	vlan_macip_lens = l4.hdr - ip.hdr;
+	vlan_macip_lens |= (ip.hdr - skb->data) << IXGBE_ADVTXD_MACLEN_SHIFT;
 	vlan_macip_lens |= first->tx_flags & IXGBE_TX_FLAGS_VLAN_MASK;
 
 	ixgbe_tx_ctxtdesc(tx_ring, vlan_macip_lens, 0, type_tucmd,
@@ -8614,6 +8629,14 @@ static int ixgbe_set_features(struct net_device *netdev,
 	if (changed & NETIF_F_RXALL)
 		need_reset = true;
 
+	/* We can only support IPV4 TSO in tunnels if we can mangle the
+	 * inner IP ID field, so strip TSO if MANGLEID is not supported.
+	 */
+	if (features & NETIF_F_TSO_MANGLEID)
+		netdev->hw_enc_features |= NETIF_F_TSO;
+	else
+		netdev->hw_enc_features &= ~NETIF_F_TSO;
+
 	netdev->features = features;
 
 #ifdef CONFIG_IXGBE_VXLAN
@@ -8927,17 +8950,25 @@ static void ixgbe_fwd_del(struct net_device *pdev, void *priv)
 	kfree(fwd_adapter);
 }
 
-#define IXGBE_MAX_TUNNEL_HDR_LEN 80
+#define IXGBE_MAX_MAC_HDR_LEN		127
+#define IXGBE_MAX_NETWORK_HDR_LEN	511
+
 static netdev_features_t
 ixgbe_features_check(struct sk_buff *skb, struct net_device *dev,
 		     netdev_features_t features)
 {
-	if (!skb->encapsulation)
-		return features;
+	unsigned int network_hdr_len, mac_hdr_len;
 
-	if (unlikely(skb_inner_mac_header(skb) - skb_transport_header(skb) >
-		     IXGBE_MAX_TUNNEL_HDR_LEN))
-		return features & ~NETIF_F_CSUM_MASK;
+	/* Make certain the headers can be described by a context descriptor */
+	mac_hdr_len = skb_network_header(skb) - skb->data;
+	network_hdr_len = skb_checksum_start(skb) - skb_network_header(skb);
+	if (unlikely((mac_hdr_len > IXGBE_MAX_MAC_HDR_LEN) ||
+		     (network_hdr_len >  IXGBE_MAX_NETWORK_HDR_LEN)))
+		return features & ~(NETIF_F_HW_CSUM |
+				    NETIF_F_SCTP_CRC |
+				    NETIF_F_HW_VLAN_CTAG_TX |
+				    NETIF_F_TSO |
+				    NETIF_F_TSO6);
 
 	return features;
 }
@@ -9309,6 +9340,17 @@ skip_sriov:
 			   NETIF_F_HW_VLAN_CTAG_RX |
 			   NETIF_F_HW_VLAN_CTAG_FILTER;
 
+#define IXGBE_GSO_PARTIAL_FEATURES (NETIF_F_GSO_GRE | \
+				    NETIF_F_GSO_GRE_CSUM | \
+				    NETIF_F_GSO_IPIP | \
+				    NETIF_F_GSO_SIT | \
+				    NETIF_F_GSO_UDP_TUNNEL | \
+				    NETIF_F_GSO_UDP_TUNNEL_CSUM)
+
+	netdev->gso_partial_features = IXGBE_GSO_PARTIAL_FEATURES;
+	netdev->features |= NETIF_F_GSO_PARTIAL |
+			    IXGBE_GSO_PARTIAL_FEATURES;
+
 	if (hw->mac.type >= ixgbe_mac_82599EB)
 		netdev->features |= NETIF_F_SCTP_CRC;
 
@@ -9323,12 +9365,17 @@ skip_sriov:
 
 	netdev->vlan_features |= NETIF_F_SG |
 				 NETIF_F_TSO |
+				 NETIF_F_TSO_MANGLEID |
 				 NETIF_F_TSO6 |
 				 NETIF_F_HW_CSUM |
 				 NETIF_F_SCTP_CRC;
 
 	netdev->mpls_features |= NETIF_F_HW_CSUM;
-	netdev->hw_enc_features |= NETIF_F_HW_CSUM;
+	netdev->hw_enc_features |= NETIF_F_HW_CSUM |
+				   NETIF_F_TSO_MANGLEID |
+				   NETIF_F_TSO6 |
+				   NETIF_F_GSO_PARTIAL |
+				   IXGBE_GSO_PARTIAL_FEATURES;
 
 	netdev->priv_flags |= IFF_UNICAST_FLT;
 	netdev->priv_flags |= IFF_SUPP_NOFCS;
diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
index 007cbe094990..e4f471787dd4 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
@@ -3272,9 +3272,18 @@ static int ixgbevf_tso(struct ixgbevf_ring *tx_ring,
 		       struct ixgbevf_tx_buffer *first,
 		       u8 *hdr_len)
 {
+	u32 vlan_macip_lens, type_tucmd, mss_l4len_idx;
 	struct sk_buff *skb = first->skb;
-	u32 vlan_macip_lens, type_tucmd;
-	u32 mss_l4len_idx, l4len;
+	union {
+		struct iphdr *v4;
+		struct ipv6hdr *v6;
+		unsigned char *hdr;
+	} ip;
+	union {
+		struct tcphdr *tcp;
+		unsigned char *hdr;
+	} l4;
+	u32 paylen, l4_offset;
 	int err;
 
 	if (skb->ip_summed != CHECKSUM_PARTIAL)
@@ -3287,49 +3296,53 @@ static int ixgbevf_tso(struct ixgbevf_ring *tx_ring,
 	if (err < 0)
 		return err;
 
+	ip.hdr = skb_network_header(skb);
+	l4.hdr = skb_checksum_start(skb);
+
 	/* ADV DTYP TUCMD MKRLOC/ISCSIHEDLEN */
 	type_tucmd = IXGBE_ADVTXD_TUCMD_L4T_TCP;
 
-	if (first->protocol == htons(ETH_P_IP)) {
-		struct iphdr *iph = ip_hdr(skb);
-
-		iph->tot_len = 0;
-		iph->check = 0;
-		tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
-							 iph->daddr, 0,
-							 IPPROTO_TCP,
-							 0);
+	/* initialize outer IP header fields */
+	if (ip.v4->version == 4) {
+		/* IP header will have to cancel out any data that
+		 * is not a part of the outer IP header
+		 */
+		ip.v4->check = csum_fold(csum_add(lco_csum(skb),
+						  csum_unfold(l4.tcp->check)));
 		type_tucmd |= IXGBE_ADVTXD_TUCMD_IPV4;
+
+		ip.v4->tot_len = 0;
 		first->tx_flags |= IXGBE_TX_FLAGS_TSO |
 				   IXGBE_TX_FLAGS_CSUM |
 				   IXGBE_TX_FLAGS_IPV4;
-	} else if (skb_is_gso_v6(skb)) {
-		ipv6_hdr(skb)->payload_len = 0;
-		tcp_hdr(skb)->check =
-		    ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
-				     &ipv6_hdr(skb)->daddr,
-				     0, IPPROTO_TCP, 0);
+	} else {
+		ip.v6->payload_len = 0;
 		first->tx_flags |= IXGBE_TX_FLAGS_TSO |
 				   IXGBE_TX_FLAGS_CSUM;
 	}
 
-	/* compute header lengths */
-	l4len = tcp_hdrlen(skb);
-	*hdr_len += l4len;
-	*hdr_len = skb_transport_offset(skb) + l4len;
+	/* determine offset of inner transport header */
+	l4_offset = l4.hdr - skb->data;
+
+	/* compute length of segmentation header */
+	*hdr_len = (l4.tcp->doff * 4) + l4_offset;
 
-	/* update GSO size and bytecount with header size */
+	/* remove payload length from inner checksum */
+	paylen = skb->len - l4_offset;
+	csum_replace_by_diff(&l4.tcp->check, htonl(paylen));
+
+	/* update gso size and bytecount with header size */
 	first->gso_segs = skb_shinfo(skb)->gso_segs;
 	first->bytecount += (first->gso_segs - 1) * *hdr_len;
 
 	/* mss_l4len_id: use 1 as index for TSO */
-	mss_l4len_idx = l4len << IXGBE_ADVTXD_L4LEN_SHIFT;
+	mss_l4len_idx = (*hdr_len - l4_offset) << IXGBE_ADVTXD_L4LEN_SHIFT;
 	mss_l4len_idx |= skb_shinfo(skb)->gso_size << IXGBE_ADVTXD_MSS_SHIFT;
 	mss_l4len_idx |= 1 << IXGBE_ADVTXD_IDX_SHIFT;
 
 	/* vlan_macip_lens: HEADLEN, MACLEN, VLAN tag */
-	vlan_macip_lens = skb_network_header_len(skb);
-	vlan_macip_lens |= skb_network_offset(skb) << IXGBE_ADVTXD_MACLEN_SHIFT;
+	vlan_macip_lens = l4.hdr - ip.hdr;
+	vlan_macip_lens |= (ip.hdr - skb->data) << IXGBE_ADVTXD_MACLEN_SHIFT;
 	vlan_macip_lens |= first->tx_flags & IXGBE_TX_FLAGS_VLAN_MASK;
 
 	ixgbevf_tx_ctxtdesc(tx_ring, vlan_macip_lens,
@@ -3870,6 +3883,45 @@ static struct rtnl_link_stats64 *ixgbevf_get_stats(struct net_device *netdev,
 	return stats;
 }
 
+static int ixgbevf_set_features(struct net_device *netdev,
+				netdev_features_t features)
+{
+	/* We can only support IPV4 TSO in tunnels if we can mangle the
+	 * inner IP ID field, so strip TSO if MANGLEID is not supported.
+	 */
+	if (features & NETIF_F_TSO_MANGLEID)
+		netdev->hw_enc_features |= NETIF_F_TSO;
+	else
+		netdev->hw_enc_features &= ~NETIF_F_TSO;
+
+	netdev->features = features;
+
+	return 0;
+}
+
+#define IXGBEVF_MAX_MAC_HDR_LEN		127
+#define IXGBEVF_MAX_NETWORK_HDR_LEN	511
+
+static netdev_features_t
+ixgbevf_features_check(struct sk_buff *skb, struct net_device *dev,
+		       netdev_features_t features)
+{
+	unsigned int network_hdr_len, mac_hdr_len;
+
+	/* Make certain the headers can be described by a context descriptor */
+	mac_hdr_len = skb_network_header(skb) - skb->data;
+	network_hdr_len = skb_checksum_start(skb) - skb_network_header(skb);
+	if (unlikely((mac_hdr_len > IXGBEVF_MAX_MAC_HDR_LEN) ||
+		     (network_hdr_len >  IXGBEVF_MAX_NETWORK_HDR_LEN)))
+		return features & ~(NETIF_F_HW_CSUM |
+				    NETIF_F_SCTP_CRC |
+				    NETIF_F_HW_VLAN_CTAG_TX |
+				    NETIF_F_TSO |
+				    NETIF_F_TSO6);
+
+	return features;
+}
+
 static const struct net_device_ops ixgbevf_netdev_ops = {
 	.ndo_open		= ixgbevf_open,
 	.ndo_stop		= ixgbevf_close,
@@ -3888,7 +3940,8 @@ static const struct net_device_ops ixgbevf_netdev_ops = {
 #ifdef CONFIG_NET_POLL_CONTROLLER
 	.ndo_poll_controller	= ixgbevf_netpoll,
 #endif
-	.ndo_features_check	= passthru_features_check,
+	.ndo_set_features	= ixgbevf_set_features,
+	.ndo_features_check	= ixgbevf_features_check,
 };
 
 static void ixgbevf_assign_netdev_ops(struct net_device *dev)
@@ -3999,6 +4052,17 @@ static int ixgbevf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 			      NETIF_F_HW_CSUM |
 			      NETIF_F_SCTP_CRC;
 
+#define IXGBEVF_GSO_PARTIAL_FEATURES (NETIF_F_GSO_GRE | \
+				      NETIF_F_GSO_GRE_CSUM | \
+				      NETIF_F_GSO_IPIP | \
+				      NETIF_F_GSO_SIT | \
+				      NETIF_F_GSO_UDP_TUNNEL | \
+				      NETIF_F_GSO_UDP_TUNNEL_CSUM)
+
+	netdev->gso_partial_features = IXGBEVF_GSO_PARTIAL_FEATURES;
+	netdev->hw_features |= NETIF_F_GSO_PARTIAL |
+			       IXGBEVF_GSO_PARTIAL_FEATURES;
+
 	netdev->features = netdev->hw_features |
 			   NETIF_F_HW_VLAN_CTAG_TX |
 			   NETIF_F_HW_VLAN_CTAG_RX |
@@ -4006,12 +4070,17 @@ static int ixgbevf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	netdev->vlan_features |= NETIF_F_SG |
 				 NETIF_F_TSO |
+				 NETIF_F_TSO_MANGLEID |
 				 NETIF_F_TSO6 |
 				 NETIF_F_HW_CSUM |
 				 NETIF_F_SCTP_CRC;
 
 	netdev->mpls_features |= NETIF_F_HW_CSUM;
-	netdev->hw_enc_features |= NETIF_F_HW_CSUM;
+	netdev->hw_enc_features |= NETIF_F_HW_CSUM |
+				   NETIF_F_TSO_MANGLEID |
+				   NETIF_F_TSO6 |
+				   NETIF_F_GSO_PARTIAL |
+				   IXGBEVF_GSO_PARTIAL_FEATURES;
 
 	if (pci_using_dac)
 		netdev->features |= NETIF_F_HIGHDMA;

Re: [next-queue PATCH 2/3] ixgbe/ixgbevf: Add support for GSO partial

[Jeff Kirsher]

[-- Attachment #1: Type: text/plain, Size: 4597 bytes --]

On Fri, 2016-04-08 at 17:06 -0400, Alexander Duyck wrote:
> This patch adds support for partial GSO segmentation in the case of
> tunnels.  Specifically with this change the driver an perform
> segmenation
> as long as the frame either has IPv6 inner headers, or we are allowed
> to
> mangle the IP IDs on the inner header.  This is needed because we
> will not
> be modifying any fields from the start of the start of the outer
> transport
> header to the start of the inner transport header as we are treating
> them
> like they are just a block of IP options.
> 
> Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
> ---
>  drivers/net/ethernet/intel/ixgbe/ixgbe_main.c     |  105
> +++++++++++++-----
>  drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c |  123
> ++++++++++++++++-----
>  2 files changed, 172 insertions(+), 56 deletions(-)

Dropping this patch (and now the series) because this does not
compile...

[23:51:49 @jtkirshe-linux:next-queue]$ make -j 77 -s
Makefile:679: Cannot use CONFIG_KCOV: -fsanitize-coverage=trace-pc is
not supported by compiler
  DESCEND  objtool
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c: In function
‘ixgbevf_set_features’:
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c:3892:17: error:
‘NETIF_F_TSO_MANGLEID’ undeclared (first use in this function)
  if (features & NETIF_F_TSO_MANGLEID)
                 ^
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c:3892:17: note: each
undeclared identifier is reported only once for each function it
appears in
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c: In function
‘ixgbevf_probe’:
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c:4062:8: error:
‘struct net_device’ has no member named ‘gso_partial_features’
  netdev->gso_partial_features = IXGBEVF_GSO_PARTIAL_FEATURES;
        ^
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c:4063:25: error:
‘NETIF_F_GSO_PARTIAL’ undeclared (first use in this function)
  netdev->hw_features |= NETIF_F_GSO_PARTIAL |
                         ^
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c:4073:6: error:
‘NETIF_F_TSO_MANGLEID’ undeclared (first use in this function)
      NETIF_F_TSO_MANGLEID |
      ^
scripts/Makefile.build:291: recipe for target
'drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.o' failed
make[5]: *** [drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.o] Error
1
scripts/Makefile.build:440: recipe for target
'drivers/net/ethernet/intel/ixgbevf' failed
make[4]: *** [drivers/net/ethernet/intel/ixgbevf] Error 2
make[4]: *** Waiting for unfinished jobs....
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c: In function
‘ixgbe_set_features’:
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:8635:17: error:
‘NETIF_F_TSO_MANGLEID’ undeclared (first use in this function)
  if (features & NETIF_F_TSO_MANGLEID)
                 ^
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:8635:17: note: each
undeclared identifier is reported only once for each function it
appears in
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c: In function
‘ixgbe_probe’:
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:9350:8: error: ‘struct
net_device’ has no member named ‘gso_partial_features’
  netdev->gso_partial_features = IXGBE_GSO_PARTIAL_FEATURES;
        ^
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:9351:22: error:
‘NETIF_F_GSO_PARTIAL’ undeclared (first use in this function)
  netdev->features |= NETIF_F_GSO_PARTIAL |
                      ^
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:9368:6: error:
‘NETIF_F_TSO_MANGLEID’ undeclared (first use in this function)
      NETIF_F_TSO_MANGLEID |
      ^
scripts/Makefile.build:291: recipe for target
'drivers/net/ethernet/intel/ixgbe/ixgbe_main.o' failed
make[5]: *** [drivers/net/ethernet/intel/ixgbe/ixgbe_main.o] Error 1
scripts/Makefile.build:440: recipe for target
'drivers/net/ethernet/intel/ixgbe' failed
make[4]: *** [drivers/net/ethernet/intel/ixgbe] Error 2
scripts/Makefile.build:440: recipe for target
'drivers/net/ethernet/intel' failed
make[3]: *** [drivers/net/ethernet/intel] Error 2
scripts/Makefile.build:440: recipe for target 'drivers/net/ethernet'
failed
make[2]: *** [drivers/net/ethernet] Error 2
scripts/Makefile.build:440: recipe for target 'drivers/net' failed
make[1]: *** [drivers/net] Error 2
Makefile:962: recipe for target 'drivers' failed
make: *** [drivers] Error 2

[-- Attachment #2: This is a digitally signed message part --]
[-- Type: application/pgp-signature, Size: 819 bytes --]

[Intel-wired-lan] [next-queue PATCH 2/3] ixgbe/ixgbevf: Add support for GSO partial

[Jeff Kirsher]

On Fri, 2016-04-08 at 17:06 -0400, Alexander Duyck wrote:
> This patch adds support for partial GSO segmentation in the case of
> tunnels.? Specifically with this change the driver an perform
> segmenation
> as long as the frame either has IPv6 inner headers, or we are allowed
> to
> mangle the IP IDs on the inner header.? This is needed because we
> will not
> be modifying any fields from the start of the start of the outer
> transport
> header to the start of the inner transport header as we are treating
> them
> like they are just a block of IP options.
> 
> Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
> ---
> ?drivers/net/ethernet/intel/ixgbe/ixgbe_main.c???? |? 105
> +++++++++++++-----
> ?drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c |? 123
> ++++++++++++++++-----
> ?2 files changed, 172 insertions(+), 56 deletions(-)

Dropping this patch (and now the series) because this does not
compile...

[23:51:49 @jtkirshe-linux:next-queue]$ make -j 77 -s
Makefile:679: Cannot use CONFIG_KCOV: -fsanitize-coverage=trace-pc is
not supported by compiler
? DESCEND??objtool
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c: In function
?ixgbevf_set_features?:
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c:3892:17: error:
?NETIF_F_TSO_MANGLEID? undeclared (first use in this function)
? if (features & NETIF_F_TSO_MANGLEID)
?????????????????^
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c:3892:17: note: each
undeclared identifier is reported only once for each function it
appears in
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c: In function
?ixgbevf_probe?:
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c:4062:8: error:
?struct net_device? has no member named ?gso_partial_features?
? netdev->gso_partial_features = IXGBEVF_GSO_PARTIAL_FEATURES;
????????^
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c:4063:25: error:
?NETIF_F_GSO_PARTIAL? undeclared (first use in this function)
? netdev->hw_features |= NETIF_F_GSO_PARTIAL |
?????????????????????????^
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c:4073:6: error:
?NETIF_F_TSO_MANGLEID? undeclared (first use in this function)
??????NETIF_F_TSO_MANGLEID |
??????^
scripts/Makefile.build:291: recipe for target
'drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.o' failed
make[5]: *** [drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.o] Error
1
scripts/Makefile.build:440: recipe for target
'drivers/net/ethernet/intel/ixgbevf' failed
make[4]: *** [drivers/net/ethernet/intel/ixgbevf] Error 2
make[4]: *** Waiting for unfinished jobs....
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c: In function
?ixgbe_set_features?:
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:8635:17: error:
?NETIF_F_TSO_MANGLEID? undeclared (first use in this function)
? if (features & NETIF_F_TSO_MANGLEID)
?????????????????^
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:8635:17: note: each
undeclared identifier is reported only once for each function it
appears in
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c: In function
?ixgbe_probe?:
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:9350:8: error: ?struct
net_device? has no member named ?gso_partial_features?
? netdev->gso_partial_features = IXGBE_GSO_PARTIAL_FEATURES;
????????^
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:9351:22: error:
?NETIF_F_GSO_PARTIAL? undeclared (first use in this function)
? netdev->features |= NETIF_F_GSO_PARTIAL |
??????????????????????^
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:9368:6: error:
?NETIF_F_TSO_MANGLEID? undeclared (first use in this function)
??????NETIF_F_TSO_MANGLEID |
??????^
scripts/Makefile.build:291: recipe for target
'drivers/net/ethernet/intel/ixgbe/ixgbe_main.o' failed
make[5]: *** [drivers/net/ethernet/intel/ixgbe/ixgbe_main.o] Error 1
scripts/Makefile.build:440: recipe for target
'drivers/net/ethernet/intel/ixgbe' failed
make[4]: *** [drivers/net/ethernet/intel/ixgbe] Error 2
scripts/Makefile.build:440: recipe for target
'drivers/net/ethernet/intel' failed
make[3]: *** [drivers/net/ethernet/intel] Error 2
scripts/Makefile.build:440: recipe for target 'drivers/net/ethernet'
failed
make[2]: *** [drivers/net/ethernet] Error 2
scripts/Makefile.build:440: recipe for target 'drivers/net' failed
make[1]: *** [drivers/net] Error 2
Makefile:962: recipe for target 'drivers' failed
make: *** [drivers] Error 2
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[next-queue PATCH 3/3] igb/igbvf: Add support for GSO partial

[Alexander Duyck]

This patch adds support for partial GSO segmentation in the case of
tunnels.  Specifically with this change the driver an perform segmenation
as long as the frame either has IPv6 inner headers, or we are allowed to
mangle the IP IDs on the inner header.  This is needed because we will not
be modifying any fields from the start of the start of the outer transport
header to the start of the inner transport header as we are treating them
like they are just a block of IP options.

Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
---
 drivers/net/ethernet/intel/igb/igb_main.c |  112 ++++++++++++++-----
 drivers/net/ethernet/intel/igbvf/netdev.c |  173 ++++++++++++++++++-----------
 2 files changed, 191 insertions(+), 94 deletions(-)

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 8e96c35307fb..998a24611246 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -2055,6 +2055,14 @@ static int igb_set_features(struct net_device *netdev,
 	if (changed & NETIF_F_HW_VLAN_CTAG_RX)
 		igb_vlan_mode(netdev, features);
 
+	/* We can only support IPV4 TSO in tunnels if we can mangle the
+	 * inner IP ID field, so strip TSO if MANGLEID is not supported.
+	 */
+	if (features & NETIF_F_TSO_MANGLEID)
+		netdev->hw_enc_features |= NETIF_F_TSO;
+	else
+		netdev->hw_enc_features &= ~NETIF_F_TSO;
+
 	if (!(changed & (NETIF_F_RXALL | NETIF_F_NTUPLE)))
 		return 0;
 
@@ -2087,6 +2095,29 @@ static int igb_ndo_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 	return ndo_dflt_fdb_add(ndm, tb, dev, addr, vid, flags);
 }
 
+#define IGB_MAX_MAC_HDR_LEN	127
+#define IGB_MAX_NETWORK_HDR_LEN	511
+
+static netdev_features_t
+igb_features_check(struct sk_buff *skb, struct net_device *dev,
+		   netdev_features_t features)
+{
+	unsigned int network_hdr_len, mac_hdr_len;
+
+	/* Make certain the headers can be described by a context descriptor */
+	mac_hdr_len = skb_network_header(skb) - skb->data;
+	network_hdr_len = skb_checksum_start(skb) - skb_network_header(skb);
+	if (unlikely((mac_hdr_len > IGB_MAX_MAC_HDR_LEN) ||
+		     (network_hdr_len >  IGB_MAX_NETWORK_HDR_LEN)))
+		return features & ~(NETIF_F_HW_CSUM |
+				    NETIF_F_SCTP_CRC |
+				    NETIF_F_HW_VLAN_CTAG_TX |
+				    NETIF_F_TSO |
+				    NETIF_F_TSO6);
+
+	return features;
+}
+
 static const struct net_device_ops igb_netdev_ops = {
 	.ndo_open		= igb_open,
 	.ndo_stop		= igb_close,
@@ -2111,7 +2142,7 @@ static const struct net_device_ops igb_netdev_ops = {
 	.ndo_fix_features	= igb_fix_features,
 	.ndo_set_features	= igb_set_features,
 	.ndo_fdb_add		= igb_ndo_fdb_add,
-	.ndo_features_check	= passthru_features_check,
+	.ndo_features_check	= igb_features_check,
 };
 
 /**
@@ -2384,6 +2415,16 @@ static int igb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (hw->mac.type >= e1000_82576)
 		netdev->features |= NETIF_F_SCTP_CRC;
 
+#define IGB_GSO_PARTIAL_FEATURES (NETIF_F_GSO_GRE | \
+				  NETIF_F_GSO_GRE_CSUM | \
+				  NETIF_F_GSO_IPIP | \
+				  NETIF_F_GSO_SIT | \
+				  NETIF_F_GSO_UDP_TUNNEL | \
+				  NETIF_F_GSO_UDP_TUNNEL_CSUM)
+
+	netdev->gso_partial_features = IGB_GSO_PARTIAL_FEATURES;
+	netdev->features |= NETIF_F_GSO_PARTIAL | IGB_GSO_PARTIAL_FEATURES;
+
 	/* copy netdev features into list of user selectable features */
 	netdev->hw_features |= netdev->features;
 	netdev->hw_features |= NETIF_F_RXALL;
@@ -2396,19 +2437,22 @@ static int igb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	netdev->vlan_features |= NETIF_F_SG |
 				 NETIF_F_TSO |
+				 NETIF_F_TSO_MANGLEID |
 				 NETIF_F_TSO6 |
 				 NETIF_F_HW_CSUM |
 				 NETIF_F_SCTP_CRC;
 
 	netdev->mpls_features |= NETIF_F_HW_CSUM;
-	netdev->hw_enc_features |= NETIF_F_HW_CSUM;
+	netdev->hw_enc_features |= NETIF_F_HW_CSUM |
+				   NETIF_F_TSO_MANGLEID |
+				   NETIF_F_TSO6 |
+				   NETIF_F_GSO_PARTIAL |
+				   IGB_GSO_PARTIAL_FEATURES;
 
 	netdev->priv_flags |= IFF_SUPP_NOFCS;
 
-	if (pci_using_dac) {
+	if (pci_using_dac)
 		netdev->features |= NETIF_F_HIGHDMA;
-		netdev->vlan_features |= NETIF_F_HIGHDMA;
-	}
 
 	netdev->priv_flags |= IFF_UNICAST_FLT;
 
@@ -4842,9 +4886,18 @@ static int igb_tso(struct igb_ring *tx_ring,
 		   struct igb_tx_buffer *first,
 		   u8 *hdr_len)
 {
+	u32 vlan_macip_lens, type_tucmd, mss_l4len_idx;
 	struct sk_buff *skb = first->skb;
-	u32 vlan_macip_lens, type_tucmd;
-	u32 mss_l4len_idx, l4len;
+	union {
+		struct iphdr *v4;
+		struct ipv6hdr *v6;
+		unsigned char *hdr;
+	} ip;
+	union {
+		struct tcphdr *tcp;
+		unsigned char *hdr;
+	} l4;
+	u32 paylen, l4_offset;
 	int err;
 
 	if (skb->ip_summed != CHECKSUM_PARTIAL)
@@ -4857,45 +4910,52 @@ static int igb_tso(struct igb_ring *tx_ring,
 	if (err < 0)
 		return err;
 
+	ip.hdr = skb_network_header(skb);
+	l4.hdr = skb_checksum_start(skb);
+
 	/* ADV DTYP TUCMD MKRLOC/ISCSIHEDLEN */
 	type_tucmd = E1000_ADVTXD_TUCMD_L4T_TCP;
 
-	if (first->protocol == htons(ETH_P_IP)) {
-		struct iphdr *iph = ip_hdr(skb);
-		iph->tot_len = 0;
-		iph->check = 0;
-		tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
-							 iph->daddr, 0,
-							 IPPROTO_TCP,
-							 0);
+	/* initialize outer IP header fields */
+	if (ip.v4->version == 4) {
+		/* IP header will have to cancel out any data that
+		 * is not a part of the outer IP header
+		 */
+		ip.v4->check = csum_fold(csum_add(lco_csum(skb),
+						  csum_unfold(l4.tcp->check)));
 		type_tucmd |= E1000_ADVTXD_TUCMD_IPV4;
+
+		ip.v4->tot_len = 0;
 		first->tx_flags |= IGB_TX_FLAGS_TSO |
 				   IGB_TX_FLAGS_CSUM |
 				   IGB_TX_FLAGS_IPV4;
-	} else if (skb_is_gso_v6(skb)) {
-		ipv6_hdr(skb)->payload_len = 0;
-		tcp_hdr(skb)->check = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
-						       &ipv6_hdr(skb)->daddr,
-						       0, IPPROTO_TCP, 0);
+	} else {
+		ip.v6->payload_len = 0;
 		first->tx_flags |= IGB_TX_FLAGS_TSO |
 				   IGB_TX_FLAGS_CSUM;
 	}
 
-	/* compute header lengths */
-	l4len = tcp_hdrlen(skb);
-	*hdr_len = skb_transport_offset(skb) + l4len;
+	/* determine offset of inner transport header */
+	l4_offset = l4.hdr - skb->data;
+
+	/* compute length of segmentation header */
+	*hdr_len = (l4.tcp->doff * 4) + l4_offset;
+
+	/* remove payload length from inner checksum */
+	paylen = skb->len - l4_offset;
+	csum_replace_by_diff(&l4.tcp->check, htonl(paylen));
 
 	/* update gso size and bytecount with header size */
 	first->gso_segs = skb_shinfo(skb)->gso_segs;
 	first->bytecount += (first->gso_segs - 1) * *hdr_len;
 
 	/* MSS L4LEN IDX */
-	mss_l4len_idx = l4len << E1000_ADVTXD_L4LEN_SHIFT;
+	mss_l4len_idx = (*hdr_len - l4_offset) << E1000_ADVTXD_L4LEN_SHIFT;
 	mss_l4len_idx |= skb_shinfo(skb)->gso_size << E1000_ADVTXD_MSS_SHIFT;
 
 	/* VLAN MACLEN IPLEN */
-	vlan_macip_lens = skb_network_header_len(skb);
-	vlan_macip_lens |= skb_network_offset(skb) << E1000_ADVTXD_MACLEN_SHIFT;
+	vlan_macip_lens = l4.hdr - ip.hdr;
+	vlan_macip_lens |= (ip.hdr - skb->data) << E1000_ADVTXD_MACLEN_SHIFT;
 	vlan_macip_lens |= first->tx_flags & IGB_TX_FLAGS_VLAN_MASK;
 
 	igb_tx_ctxtdesc(tx_ring, vlan_macip_lens, type_tucmd, mss_l4len_idx);
diff --git a/drivers/net/ethernet/intel/igbvf/netdev.c b/drivers/net/ethernet/intel/igbvf/netdev.c
index c12442252adb..cd759c5e09f8 100644
--- a/drivers/net/ethernet/intel/igbvf/netdev.c
+++ b/drivers/net/ethernet/intel/igbvf/netdev.c
@@ -1933,83 +1933,74 @@ static void igbvf_tx_ctxtdesc(struct igbvf_ring *tx_ring, u32 vlan_macip_lens,
 	buffer_info->dma = 0;
 }
 
-static int igbvf_tso(struct igbvf_adapter *adapter,
-		     struct igbvf_ring *tx_ring,
-		     struct sk_buff *skb, u32 tx_flags, u8 *hdr_len,
-		     __be16 protocol)
-{
-	struct e1000_adv_tx_context_desc *context_desc;
-	struct igbvf_buffer *buffer_info;
-	u32 info = 0, tu_cmd = 0;
-	u32 mss_l4len_idx, l4len;
-	unsigned int i;
+static int igbvf_tso(struct igbvf_ring *tx_ring,
+		     struct sk_buff *skb, u32 tx_flags, u8 *hdr_len)
+{
+	u32 vlan_macip_lens, type_tucmd, mss_l4len_idx;
+	union {
+		struct iphdr *v4;
+		struct ipv6hdr *v6;
+		unsigned char *hdr;
+	} ip;
+	union {
+		struct tcphdr *tcp;
+		unsigned char *hdr;
+	} l4;
+	u32 paylen, l4_offset;
 	int err;
 
-	*hdr_len = 0;
+	if (skb->ip_summed != CHECKSUM_PARTIAL)
+		return 0;
+
+	if (!skb_is_gso(skb))
+		return 0;
 
 	err = skb_cow_head(skb, 0);
-	if (err < 0) {
-		dev_err(&adapter->pdev->dev, "igbvf_tso returning an error\n");
+	if (err < 0)
 		return err;
-	}
 
-	l4len = tcp_hdrlen(skb);
-	*hdr_len += l4len;
-
-	if (protocol == htons(ETH_P_IP)) {
-		struct iphdr *iph = ip_hdr(skb);
-
-		iph->tot_len = 0;
-		iph->check = 0;
-		tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
-							 iph->daddr, 0,
-							 IPPROTO_TCP,
-							 0);
-	} else if (skb_is_gso_v6(skb)) {
-		ipv6_hdr(skb)->payload_len = 0;
-		tcp_hdr(skb)->check = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
-						       &ipv6_hdr(skb)->daddr,
-						       0, IPPROTO_TCP, 0);
-	}
+	ip.hdr = skb_network_header(skb);
+	l4.hdr = skb_checksum_start(skb);
 
-	i = tx_ring->next_to_use;
+	/* ADV DTYP TUCMD MKRLOC/ISCSIHEDLEN */
+	type_tucmd = E1000_ADVTXD_TUCMD_L4T_TCP;
 
-	buffer_info = &tx_ring->buffer_info[i];
-	context_desc = IGBVF_TX_CTXTDESC_ADV(*tx_ring, i);
-	/* VLAN MACLEN IPLEN */
-	if (tx_flags & IGBVF_TX_FLAGS_VLAN)
-		info |= (tx_flags & IGBVF_TX_FLAGS_VLAN_MASK);
-	info |= (skb_network_offset(skb) << E1000_ADVTXD_MACLEN_SHIFT);
-	*hdr_len += skb_network_offset(skb);
-	info |= (skb_transport_header(skb) - skb_network_header(skb));
-	*hdr_len += (skb_transport_header(skb) - skb_network_header(skb));
-	context_desc->vlan_macip_lens = cpu_to_le32(info);
+	/* initialize outer IP header fields */
+	if (ip.v4->version == 4) {
+		/* IP header will have to cancel out any data that
+		 * is not a part of the outer IP header
+		 */
+		ip.v4->check = csum_fold(csum_add(lco_csum(skb),
+						  csum_unfold(l4.tcp->check)));
+		type_tucmd |= E1000_ADVTXD_TUCMD_IPV4;
 
-	/* ADV DTYP TUCMD MKRLOC/ISCSIHEDLEN */
-	tu_cmd |= (E1000_TXD_CMD_DEXT | E1000_ADVTXD_DTYP_CTXT);
+		ip.v4->tot_len = 0;
+	} else {
+		ip.v6->payload_len = 0;
+	}
 
-	if (protocol == htons(ETH_P_IP))
-		tu_cmd |= E1000_ADVTXD_TUCMD_IPV4;
-	tu_cmd |= E1000_ADVTXD_TUCMD_L4T_TCP;
+	/* determine offset of inner transport header */
+	l4_offset = l4.hdr - skb->data;
 
-	context_desc->type_tucmd_mlhl = cpu_to_le32(tu_cmd);
+	/* compute length of segmentation header */
+	*hdr_len = (l4.tcp->doff * 4) + l4_offset;
 
-	/* MSS L4LEN IDX */
-	mss_l4len_idx = (skb_shinfo(skb)->gso_size << E1000_ADVTXD_MSS_SHIFT);
-	mss_l4len_idx |= (l4len << E1000_ADVTXD_L4LEN_SHIFT);
+	/* remove payload length from inner checksum */
+	paylen = skb->len - l4_offset;
+	csum_replace_by_diff(&l4.tcp->check, htonl(paylen));
 
-	context_desc->mss_l4len_idx = cpu_to_le32(mss_l4len_idx);
-	context_desc->seqnum_seed = 0;
+	/* MSS L4LEN IDX */
+	mss_l4len_idx = (*hdr_len - l4_offset) << E1000_ADVTXD_L4LEN_SHIFT;
+	mss_l4len_idx |= skb_shinfo(skb)->gso_size << E1000_ADVTXD_MSS_SHIFT;
 
-	buffer_info->time_stamp = jiffies;
-	buffer_info->dma = 0;
-	i++;
-	if (i == tx_ring->count)
-		i = 0;
+	/* VLAN MACLEN IPLEN */
+	vlan_macip_lens = l4.hdr - ip.hdr;
+	vlan_macip_lens |= (ip.hdr - skb->data) << E1000_ADVTXD_MACLEN_SHIFT;
+	vlan_macip_lens |= tx_flags & IGBVF_TX_FLAGS_VLAN_MASK;
 
-	tx_ring->next_to_use = i;
+	igbvf_tx_ctxtdesc(tx_ring, vlan_macip_lens, type_tucmd, mss_l4len_idx);
 
-	return true;
+	return 1;
 }
 
 static inline bool igbvf_ipv6_csum_is_sctp(struct sk_buff *skb)
@@ -2271,8 +2262,7 @@ static netdev_tx_t igbvf_xmit_frame_ring_adv(struct sk_buff *skb,
 
 	first = tx_ring->next_to_use;
 
-	tso = skb_is_gso(skb) ?
-		igbvf_tso(adapter, tx_ring, skb, tx_flags, &hdr_len, protocol) : 0;
+	tso = igbvf_tso(tx_ring, skb, tx_flags, &hdr_len);
 	if (unlikely(tso < 0)) {
 		dev_kfree_skb_any(skb);
 		return NETDEV_TX_OK;
@@ -2612,9 +2602,40 @@ static int igbvf_set_features(struct net_device *netdev,
 	else
 		adapter->flags |= IGBVF_FLAG_RX_CSUM_DISABLED;
 
+	/* We can only support IPV4 TSO in tunnels if we can mangle the
+	 * inner IP ID field, so strip TSO if MANGLEID is not supported.
+	 */
+	if (features & NETIF_F_TSO_MANGLEID)
+		netdev->hw_enc_features |= NETIF_F_TSO;
+	else
+		netdev->hw_enc_features &= ~NETIF_F_TSO;
+
 	return 0;
 }
 
+#define IGBVF_MAX_MAC_HDR_LEN		127
+#define IGBVF_MAX_NETWORK_HDR_LEN	511
+
+static netdev_features_t
+igbvf_features_check(struct sk_buff *skb, struct net_device *dev,
+		     netdev_features_t features)
+{
+	unsigned int network_hdr_len, mac_hdr_len;
+
+	/* Make certain the headers can be described by a context descriptor */
+	mac_hdr_len = skb_network_header(skb) - skb->data;
+	network_hdr_len = skb_checksum_start(skb) - skb_network_header(skb);
+	if (unlikely((mac_hdr_len > IGBVF_MAX_MAC_HDR_LEN) ||
+		     (network_hdr_len >  IGBVF_MAX_NETWORK_HDR_LEN)))
+		return features & ~(NETIF_F_HW_CSUM |
+				    NETIF_F_SCTP_CRC |
+				    NETIF_F_HW_VLAN_CTAG_TX |
+				    NETIF_F_TSO |
+				    NETIF_F_TSO6);
+
+	return features;
+}
+
 static const struct net_device_ops igbvf_netdev_ops = {
 	.ndo_open		= igbvf_open,
 	.ndo_stop		= igbvf_close,
@@ -2631,7 +2652,7 @@ static const struct net_device_ops igbvf_netdev_ops = {
 	.ndo_poll_controller	= igbvf_netpoll,
 #endif
 	.ndo_set_features	= igbvf_set_features,
-	.ndo_features_check	= passthru_features_check,
+	.ndo_features_check	= igbvf_features_check,
 };
 
 /**
@@ -2739,22 +2760,38 @@ static int igbvf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 			      NETIF_F_HW_CSUM |
 			      NETIF_F_SCTP_CRC;
 
+#define IGBVF_GSO_PARTIAL_FEATURES (NETIF_F_GSO_GRE | \
+				    NETIF_F_GSO_GRE_CSUM | \
+				    NETIF_F_GSO_IPIP | \
+				    NETIF_F_GSO_SIT | \
+				    NETIF_F_GSO_UDP_TUNNEL | \
+				    NETIF_F_GSO_UDP_TUNNEL_CSUM)
+
+	netdev->gso_partial_features = IGBVF_GSO_PARTIAL_FEATURES;
+	netdev->hw_features |= NETIF_F_GSO_PARTIAL |
+			       IGBVF_GSO_PARTIAL_FEATURES;
+
 	netdev->features = netdev->hw_features |
 			   NETIF_F_HW_VLAN_CTAG_TX |
 			   NETIF_F_HW_VLAN_CTAG_RX |
 			   NETIF_F_HW_VLAN_CTAG_FILTER;
 
-	if (pci_using_dac)
-		netdev->features |= NETIF_F_HIGHDMA;
-
 	netdev->vlan_features |= NETIF_F_SG |
 				 NETIF_F_TSO |
+				 NETIF_F_TSO_MANGLEID |
 				 NETIF_F_TSO6 |
 				 NETIF_F_HW_CSUM |
 				 NETIF_F_SCTP_CRC;
 
 	netdev->mpls_features |= NETIF_F_HW_CSUM;
-	netdev->hw_enc_features |= NETIF_F_HW_CSUM;
+	netdev->hw_enc_features |= NETIF_F_HW_CSUM |
+				   NETIF_F_TSO_MANGLEID |
+				   NETIF_F_TSO6 |
+				   NETIF_F_GSO_PARTIAL |
+				   IGBVF_GSO_PARTIAL_FEATURES;
+
+	if (pci_using_dac)
+		netdev->features |= NETIF_F_HIGHDMA;
 
 	/*reset the controller to put the device in a known good state */
 	err = hw->mac.ops.reset_hw(hw);

[Intel-wired-lan] [next-queue PATCH 3/3] igb/igbvf: Add support for GSO partial

[Alexander Duyck]

This patch adds support for partial GSO segmentation in the case of
tunnels.  Specifically with this change the driver an perform segmenation
as long as the frame either has IPv6 inner headers, or we are allowed to
mangle the IP IDs on the inner header.  This is needed because we will not
be modifying any fields from the start of the start of the outer transport
header to the start of the inner transport header as we are treating them
like they are just a block of IP options.

Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
---
 drivers/net/ethernet/intel/igb/igb_main.c |  112 ++++++++++++++-----
 drivers/net/ethernet/intel/igbvf/netdev.c |  173 ++++++++++++++++++-----------
 2 files changed, 191 insertions(+), 94 deletions(-)

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 8e96c35307fb..998a24611246 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -2055,6 +2055,14 @@ static int igb_set_features(struct net_device *netdev,
 	if (changed & NETIF_F_HW_VLAN_CTAG_RX)
 		igb_vlan_mode(netdev, features);
 
+	/* We can only support IPV4 TSO in tunnels if we can mangle the
+	 * inner IP ID field, so strip TSO if MANGLEID is not supported.
+	 */
+	if (features & NETIF_F_TSO_MANGLEID)
+		netdev->hw_enc_features |= NETIF_F_TSO;
+	else
+		netdev->hw_enc_features &= ~NETIF_F_TSO;
+
 	if (!(changed & (NETIF_F_RXALL | NETIF_F_NTUPLE)))
 		return 0;
 
@@ -2087,6 +2095,29 @@ static int igb_ndo_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 	return ndo_dflt_fdb_add(ndm, tb, dev, addr, vid, flags);
 }
 
+#define IGB_MAX_MAC_HDR_LEN	127
+#define IGB_MAX_NETWORK_HDR_LEN	511
+
+static netdev_features_t
+igb_features_check(struct sk_buff *skb, struct net_device *dev,
+		   netdev_features_t features)
+{
+	unsigned int network_hdr_len, mac_hdr_len;
+
+	/* Make certain the headers can be described by a context descriptor */
+	mac_hdr_len = skb_network_header(skb) - skb->data;
+	network_hdr_len = skb_checksum_start(skb) - skb_network_header(skb);
+	if (unlikely((mac_hdr_len > IGB_MAX_MAC_HDR_LEN) ||
+		     (network_hdr_len >  IGB_MAX_NETWORK_HDR_LEN)))
+		return features & ~(NETIF_F_HW_CSUM |
+				    NETIF_F_SCTP_CRC |
+				    NETIF_F_HW_VLAN_CTAG_TX |
+				    NETIF_F_TSO |
+				    NETIF_F_TSO6);
+
+	return features;
+}
+
 static const struct net_device_ops igb_netdev_ops = {
 	.ndo_open		= igb_open,
 	.ndo_stop		= igb_close,
@@ -2111,7 +2142,7 @@ static const struct net_device_ops igb_netdev_ops = {
 	.ndo_fix_features	= igb_fix_features,
 	.ndo_set_features	= igb_set_features,
 	.ndo_fdb_add		= igb_ndo_fdb_add,
-	.ndo_features_check	= passthru_features_check,
+	.ndo_features_check	= igb_features_check,
 };
 
 /**
@@ -2384,6 +2415,16 @@ static int igb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (hw->mac.type >= e1000_82576)
 		netdev->features |= NETIF_F_SCTP_CRC;
 
+#define IGB_GSO_PARTIAL_FEATURES (NETIF_F_GSO_GRE | \
+				  NETIF_F_GSO_GRE_CSUM | \
+				  NETIF_F_GSO_IPIP | \
+				  NETIF_F_GSO_SIT | \
+				  NETIF_F_GSO_UDP_TUNNEL | \
+				  NETIF_F_GSO_UDP_TUNNEL_CSUM)
+
+	netdev->gso_partial_features = IGB_GSO_PARTIAL_FEATURES;
+	netdev->features |= NETIF_F_GSO_PARTIAL | IGB_GSO_PARTIAL_FEATURES;
+
 	/* copy netdev features into list of user selectable features */
 	netdev->hw_features |= netdev->features;
 	netdev->hw_features |= NETIF_F_RXALL;
@@ -2396,19 +2437,22 @@ static int igb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	netdev->vlan_features |= NETIF_F_SG |
 				 NETIF_F_TSO |
+				 NETIF_F_TSO_MANGLEID |
 				 NETIF_F_TSO6 |
 				 NETIF_F_HW_CSUM |
 				 NETIF_F_SCTP_CRC;
 
 	netdev->mpls_features |= NETIF_F_HW_CSUM;
-	netdev->hw_enc_features |= NETIF_F_HW_CSUM;
+	netdev->hw_enc_features |= NETIF_F_HW_CSUM |
+				   NETIF_F_TSO_MANGLEID |
+				   NETIF_F_TSO6 |
+				   NETIF_F_GSO_PARTIAL |
+				   IGB_GSO_PARTIAL_FEATURES;
 
 	netdev->priv_flags |= IFF_SUPP_NOFCS;
 
-	if (pci_using_dac) {
+	if (pci_using_dac)
 		netdev->features |= NETIF_F_HIGHDMA;
-		netdev->vlan_features |= NETIF_F_HIGHDMA;
-	}
 
 	netdev->priv_flags |= IFF_UNICAST_FLT;
 
@@ -4842,9 +4886,18 @@ static int igb_tso(struct igb_ring *tx_ring,
 		   struct igb_tx_buffer *first,
 		   u8 *hdr_len)
 {
+	u32 vlan_macip_lens, type_tucmd, mss_l4len_idx;
 	struct sk_buff *skb = first->skb;
-	u32 vlan_macip_lens, type_tucmd;
-	u32 mss_l4len_idx, l4len;
+	union {
+		struct iphdr *v4;
+		struct ipv6hdr *v6;
+		unsigned char *hdr;
+	} ip;
+	union {
+		struct tcphdr *tcp;
+		unsigned char *hdr;
+	} l4;
+	u32 paylen, l4_offset;
 	int err;
 
 	if (skb->ip_summed != CHECKSUM_PARTIAL)
@@ -4857,45 +4910,52 @@ static int igb_tso(struct igb_ring *tx_ring,
 	if (err < 0)
 		return err;
 
+	ip.hdr = skb_network_header(skb);
+	l4.hdr = skb_checksum_start(skb);
+
 	/* ADV DTYP TUCMD MKRLOC/ISCSIHEDLEN */
 	type_tucmd = E1000_ADVTXD_TUCMD_L4T_TCP;
 
-	if (first->protocol == htons(ETH_P_IP)) {
-		struct iphdr *iph = ip_hdr(skb);
-		iph->tot_len = 0;
-		iph->check = 0;
-		tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
-							 iph->daddr, 0,
-							 IPPROTO_TCP,
-							 0);
+	/* initialize outer IP header fields */
+	if (ip.v4->version == 4) {
+		/* IP header will have to cancel out any data that
+		 * is not a part of the outer IP header
+		 */
+		ip.v4->check = csum_fold(csum_add(lco_csum(skb),
+						  csum_unfold(l4.tcp->check)));
 		type_tucmd |= E1000_ADVTXD_TUCMD_IPV4;
+
+		ip.v4->tot_len = 0;
 		first->tx_flags |= IGB_TX_FLAGS_TSO |
 				   IGB_TX_FLAGS_CSUM |
 				   IGB_TX_FLAGS_IPV4;
-	} else if (skb_is_gso_v6(skb)) {
-		ipv6_hdr(skb)->payload_len = 0;
-		tcp_hdr(skb)->check = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
-						       &ipv6_hdr(skb)->daddr,
-						       0, IPPROTO_TCP, 0);
+	} else {
+		ip.v6->payload_len = 0;
 		first->tx_flags |= IGB_TX_FLAGS_TSO |
 				   IGB_TX_FLAGS_CSUM;
 	}
 
-	/* compute header lengths */
-	l4len = tcp_hdrlen(skb);
-	*hdr_len = skb_transport_offset(skb) + l4len;
+	/* determine offset of inner transport header */
+	l4_offset = l4.hdr - skb->data;
+
+	/* compute length of segmentation header */
+	*hdr_len = (l4.tcp->doff * 4) + l4_offset;
+
+	/* remove payload length from inner checksum */
+	paylen = skb->len - l4_offset;
+	csum_replace_by_diff(&l4.tcp->check, htonl(paylen));
 
 	/* update gso size and bytecount with header size */
 	first->gso_segs = skb_shinfo(skb)->gso_segs;
 	first->bytecount += (first->gso_segs - 1) * *hdr_len;
 
 	/* MSS L4LEN IDX */
-	mss_l4len_idx = l4len << E1000_ADVTXD_L4LEN_SHIFT;
+	mss_l4len_idx = (*hdr_len - l4_offset) << E1000_ADVTXD_L4LEN_SHIFT;
 	mss_l4len_idx |= skb_shinfo(skb)->gso_size << E1000_ADVTXD_MSS_SHIFT;
 
 	/* VLAN MACLEN IPLEN */
-	vlan_macip_lens = skb_network_header_len(skb);
-	vlan_macip_lens |= skb_network_offset(skb) << E1000_ADVTXD_MACLEN_SHIFT;
+	vlan_macip_lens = l4.hdr - ip.hdr;
+	vlan_macip_lens |= (ip.hdr - skb->data) << E1000_ADVTXD_MACLEN_SHIFT;
 	vlan_macip_lens |= first->tx_flags & IGB_TX_FLAGS_VLAN_MASK;
 
 	igb_tx_ctxtdesc(tx_ring, vlan_macip_lens, type_tucmd, mss_l4len_idx);
diff --git a/drivers/net/ethernet/intel/igbvf/netdev.c b/drivers/net/ethernet/intel/igbvf/netdev.c
index c12442252adb..cd759c5e09f8 100644
--- a/drivers/net/ethernet/intel/igbvf/netdev.c
+++ b/drivers/net/ethernet/intel/igbvf/netdev.c
@@ -1933,83 +1933,74 @@ static void igbvf_tx_ctxtdesc(struct igbvf_ring *tx_ring, u32 vlan_macip_lens,
 	buffer_info->dma = 0;
 }
 
-static int igbvf_tso(struct igbvf_adapter *adapter,
-		     struct igbvf_ring *tx_ring,
-		     struct sk_buff *skb, u32 tx_flags, u8 *hdr_len,
-		     __be16 protocol)
-{
-	struct e1000_adv_tx_context_desc *context_desc;
-	struct igbvf_buffer *buffer_info;
-	u32 info = 0, tu_cmd = 0;
-	u32 mss_l4len_idx, l4len;
-	unsigned int i;
+static int igbvf_tso(struct igbvf_ring *tx_ring,
+		     struct sk_buff *skb, u32 tx_flags, u8 *hdr_len)
+{
+	u32 vlan_macip_lens, type_tucmd, mss_l4len_idx;
+	union {
+		struct iphdr *v4;
+		struct ipv6hdr *v6;
+		unsigned char *hdr;
+	} ip;
+	union {
+		struct tcphdr *tcp;
+		unsigned char *hdr;
+	} l4;
+	u32 paylen, l4_offset;
 	int err;
 
-	*hdr_len = 0;
+	if (skb->ip_summed != CHECKSUM_PARTIAL)
+		return 0;
+
+	if (!skb_is_gso(skb))
+		return 0;
 
 	err = skb_cow_head(skb, 0);
-	if (err < 0) {
-		dev_err(&adapter->pdev->dev, "igbvf_tso returning an error\n");
+	if (err < 0)
 		return err;
-	}
 
-	l4len = tcp_hdrlen(skb);
-	*hdr_len += l4len;
-
-	if (protocol == htons(ETH_P_IP)) {
-		struct iphdr *iph = ip_hdr(skb);
-
-		iph->tot_len = 0;
-		iph->check = 0;
-		tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
-							 iph->daddr, 0,
-							 IPPROTO_TCP,
-							 0);
-	} else if (skb_is_gso_v6(skb)) {
-		ipv6_hdr(skb)->payload_len = 0;
-		tcp_hdr(skb)->check = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
-						       &ipv6_hdr(skb)->daddr,
-						       0, IPPROTO_TCP, 0);
-	}
+	ip.hdr = skb_network_header(skb);
+	l4.hdr = skb_checksum_start(skb);
 
-	i = tx_ring->next_to_use;
+	/* ADV DTYP TUCMD MKRLOC/ISCSIHEDLEN */
+	type_tucmd = E1000_ADVTXD_TUCMD_L4T_TCP;
 
-	buffer_info = &tx_ring->buffer_info[i];
-	context_desc = IGBVF_TX_CTXTDESC_ADV(*tx_ring, i);
-	/* VLAN MACLEN IPLEN */
-	if (tx_flags & IGBVF_TX_FLAGS_VLAN)
-		info |= (tx_flags & IGBVF_TX_FLAGS_VLAN_MASK);
-	info |= (skb_network_offset(skb) << E1000_ADVTXD_MACLEN_SHIFT);
-	*hdr_len += skb_network_offset(skb);
-	info |= (skb_transport_header(skb) - skb_network_header(skb));
-	*hdr_len += (skb_transport_header(skb) - skb_network_header(skb));
-	context_desc->vlan_macip_lens = cpu_to_le32(info);
+	/* initialize outer IP header fields */
+	if (ip.v4->version == 4) {
+		/* IP header will have to cancel out any data that
+		 * is not a part of the outer IP header
+		 */
+		ip.v4->check = csum_fold(csum_add(lco_csum(skb),
+						  csum_unfold(l4.tcp->check)));
+		type_tucmd |= E1000_ADVTXD_TUCMD_IPV4;
 
-	/* ADV DTYP TUCMD MKRLOC/ISCSIHEDLEN */
-	tu_cmd |= (E1000_TXD_CMD_DEXT | E1000_ADVTXD_DTYP_CTXT);
+		ip.v4->tot_len = 0;
+	} else {
+		ip.v6->payload_len = 0;
+	}
 
-	if (protocol == htons(ETH_P_IP))
-		tu_cmd |= E1000_ADVTXD_TUCMD_IPV4;
-	tu_cmd |= E1000_ADVTXD_TUCMD_L4T_TCP;
+	/* determine offset of inner transport header */
+	l4_offset = l4.hdr - skb->data;
 
-	context_desc->type_tucmd_mlhl = cpu_to_le32(tu_cmd);
+	/* compute length of segmentation header */
+	*hdr_len = (l4.tcp->doff * 4) + l4_offset;
 
-	/* MSS L4LEN IDX */
-	mss_l4len_idx = (skb_shinfo(skb)->gso_size << E1000_ADVTXD_MSS_SHIFT);
-	mss_l4len_idx |= (l4len << E1000_ADVTXD_L4LEN_SHIFT);
+	/* remove payload length from inner checksum */
+	paylen = skb->len - l4_offset;
+	csum_replace_by_diff(&l4.tcp->check, htonl(paylen));
 
-	context_desc->mss_l4len_idx = cpu_to_le32(mss_l4len_idx);
-	context_desc->seqnum_seed = 0;
+	/* MSS L4LEN IDX */
+	mss_l4len_idx = (*hdr_len - l4_offset) << E1000_ADVTXD_L4LEN_SHIFT;
+	mss_l4len_idx |= skb_shinfo(skb)->gso_size << E1000_ADVTXD_MSS_SHIFT;
 
-	buffer_info->time_stamp = jiffies;
-	buffer_info->dma = 0;
-	i++;
-	if (i == tx_ring->count)
-		i = 0;
+	/* VLAN MACLEN IPLEN */
+	vlan_macip_lens = l4.hdr - ip.hdr;
+	vlan_macip_lens |= (ip.hdr - skb->data) << E1000_ADVTXD_MACLEN_SHIFT;
+	vlan_macip_lens |= tx_flags & IGBVF_TX_FLAGS_VLAN_MASK;
 
-	tx_ring->next_to_use = i;
+	igbvf_tx_ctxtdesc(tx_ring, vlan_macip_lens, type_tucmd, mss_l4len_idx);
 
-	return true;
+	return 1;
 }
 
 static inline bool igbvf_ipv6_csum_is_sctp(struct sk_buff *skb)
@@ -2271,8 +2262,7 @@ static netdev_tx_t igbvf_xmit_frame_ring_adv(struct sk_buff *skb,
 
 	first = tx_ring->next_to_use;
 
-	tso = skb_is_gso(skb) ?
-		igbvf_tso(adapter, tx_ring, skb, tx_flags, &hdr_len, protocol) : 0;
+	tso = igbvf_tso(tx_ring, skb, tx_flags, &hdr_len);
 	if (unlikely(tso < 0)) {
 		dev_kfree_skb_any(skb);
 		return NETDEV_TX_OK;
@@ -2612,9 +2602,40 @@ static int igbvf_set_features(struct net_device *netdev,
 	else
 		adapter->flags |= IGBVF_FLAG_RX_CSUM_DISABLED;
 
+	/* We can only support IPV4 TSO in tunnels if we can mangle the
+	 * inner IP ID field, so strip TSO if MANGLEID is not supported.
+	 */
+	if (features & NETIF_F_TSO_MANGLEID)
+		netdev->hw_enc_features |= NETIF_F_TSO;
+	else
+		netdev->hw_enc_features &= ~NETIF_F_TSO;
+
 	return 0;
 }
 
+#define IGBVF_MAX_MAC_HDR_LEN		127
+#define IGBVF_MAX_NETWORK_HDR_LEN	511
+
+static netdev_features_t
+igbvf_features_check(struct sk_buff *skb, struct net_device *dev,
+		     netdev_features_t features)
+{
+	unsigned int network_hdr_len, mac_hdr_len;
+
+	/* Make certain the headers can be described by a context descriptor */
+	mac_hdr_len = skb_network_header(skb) - skb->data;
+	network_hdr_len = skb_checksum_start(skb) - skb_network_header(skb);
+	if (unlikely((mac_hdr_len > IGBVF_MAX_MAC_HDR_LEN) ||
+		     (network_hdr_len >  IGBVF_MAX_NETWORK_HDR_LEN)))
+		return features & ~(NETIF_F_HW_CSUM |
+				    NETIF_F_SCTP_CRC |
+				    NETIF_F_HW_VLAN_CTAG_TX |
+				    NETIF_F_TSO |
+				    NETIF_F_TSO6);
+
+	return features;
+}
+
 static const struct net_device_ops igbvf_netdev_ops = {
 	.ndo_open		= igbvf_open,
 	.ndo_stop		= igbvf_close,
@@ -2631,7 +2652,7 @@ static const struct net_device_ops igbvf_netdev_ops = {
 	.ndo_poll_controller	= igbvf_netpoll,
 #endif
 	.ndo_set_features	= igbvf_set_features,
-	.ndo_features_check	= passthru_features_check,
+	.ndo_features_check	= igbvf_features_check,
 };
 
 /**
@@ -2739,22 +2760,38 @@ static int igbvf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 			      NETIF_F_HW_CSUM |
 			      NETIF_F_SCTP_CRC;
 
+#define IGBVF_GSO_PARTIAL_FEATURES (NETIF_F_GSO_GRE | \
+				    NETIF_F_GSO_GRE_CSUM | \
+				    NETIF_F_GSO_IPIP | \
+				    NETIF_F_GSO_SIT | \
+				    NETIF_F_GSO_UDP_TUNNEL | \
+				    NETIF_F_GSO_UDP_TUNNEL_CSUM)
+
+	netdev->gso_partial_features = IGBVF_GSO_PARTIAL_FEATURES;
+	netdev->hw_features |= NETIF_F_GSO_PARTIAL |
+			       IGBVF_GSO_PARTIAL_FEATURES;
+
 	netdev->features = netdev->hw_features |
 			   NETIF_F_HW_VLAN_CTAG_TX |
 			   NETIF_F_HW_VLAN_CTAG_RX |
 			   NETIF_F_HW_VLAN_CTAG_FILTER;
 
-	if (pci_using_dac)
-		netdev->features |= NETIF_F_HIGHDMA;
-
 	netdev->vlan_features |= NETIF_F_SG |
 				 NETIF_F_TSO |
+				 NETIF_F_TSO_MANGLEID |
 				 NETIF_F_TSO6 |
 				 NETIF_F_HW_CSUM |
 				 NETIF_F_SCTP_CRC;
 
 	netdev->mpls_features |= NETIF_F_HW_CSUM;
-	netdev->hw_enc_features |= NETIF_F_HW_CSUM;
+	netdev->hw_enc_features |= NETIF_F_HW_CSUM |
+				   NETIF_F_TSO_MANGLEID |
+				   NETIF_F_TSO6 |
+				   NETIF_F_GSO_PARTIAL |
+				   IGBVF_GSO_PARTIAL_FEATURES;
+
+	if (pci_using_dac)
+		netdev->features |= NETIF_F_HIGHDMA;
 
 	/*reset the controller to put the device in a known good state */
 	err = hw->mac.ops.reset_hw(hw);

Re: [next-queue PATCH 0/3] Add support for GSO partial to Intel NIC drivers

[Jeff Kirsher]

[-- Attachment #1: Type: text/plain, Size: 1711 bytes --]

On Fri, 2016-04-08 at 17:06 -0400, Alexander Duyck wrote:
> So these are the patches needed to enable tunnel segmentation
> offloads on
> the igb, igbvf, ixgbe, and ixgbevf drivers.  In addition this patch
> extends
> the i40e and i40evf drivers to include segmentation support for
> tunnels
> with outer checksums.
> 
> The net performance gain for these patches are pretty significant. 
> In the
> case of i40e a tunnel with outer checksums showed the following
> improvement:
> Throughput Throughput  Local Local   Result 
>            Units       CPU   Service Tag    
>                        Util  Demand         
>                        %                    
> 14066.29   10^6bits/s  3.49  0.651   "before" 
> 20618.16   10^6bits/s  3.09  0.393   "after"
> 
> For ixgbe similar results were seen:
> Throughput Throughput  Local  Local   Result 
>            Units       CPU    Service Tag    
>                        Util   Demand         
>                        %               
> 12879.89   10^6bits/s  10.00  0.763   "before"
> 14286.77   10^6bits/s  5.74   0.395   "after" 
> 
> These patches all rely on the TSO_MANGLEID and GSO_PARTIAL patches so
> I
> would not recommend applying them until those patches have first been
> applied.

Sorry I did not see this until after I tried applying your series. :-(

Maybe the two dependent patches should have been in the series, so I
and others do not waste their time.  Or not send this until the two
patches were accepted.

[-- Attachment #2: This is a digitally signed message part --]
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[Intel-wired-lan] [next-queue PATCH 0/3] Add support for GSO partial to Intel NIC drivers

[Jeff Kirsher]

On Fri, 2016-04-08 at 17:06 -0400, Alexander Duyck wrote:
> So these are the patches needed to enable tunnel segmentation
> offloads on
> the igb, igbvf, ixgbe, and ixgbevf drivers.? In addition this patch
> extends
> the i40e and i40evf drivers to include segmentation support for
> tunnels
> with outer checksums.
> 
> The net performance gain for these patches are pretty significant.?
> In the
> case of i40e a tunnel with outer checksums showed the following
> improvement:
> Throughput Throughput? Local Local?? Result?
> ?????????? Units?????? CPU?? Service Tag????
> ?????????????????????? Util? Demand?????????
> ?????????????????????? %????????????????????
> 14066.29?? 10^6bits/s? 3.49? 0.651?? "before"?
> 20618.16?? 10^6bits/s? 3.09? 0.393?? "after"
> 
> For ixgbe similar results were seen:
> Throughput Throughput? Local? Local?? Result?
> ?????????? Units?????? CPU??? Service Tag????
> ?????????????????????? Util?? Demand?????????
> ?????????????????????? %???????????????
> 12879.89?? 10^6bits/s? 10.00? 0.763?? "before"
> 14286.77?? 10^6bits/s? 5.74?? 0.395?? "after"?
> 
> These patches all rely on the TSO_MANGLEID and GSO_PARTIAL patches so
> I
> would not recommend applying them until those patches have first been
> applied.

Sorry I did not see this until after I tried applying your series. :-(

Maybe the two dependent patches should have been in the series, so I
and others do not waste their time. ?Or not send this until the two
patches were accepted.
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Re: [next-queue PATCH 0/3] Add support for GSO partial to Intel NIC drivers

[Alexander Duyck]

On Fri, Apr 8, 2016 at 11:59 PM, Jeff Kirsher
<jeffrey.t.kirsher@intel.com> wrote:
> On Fri, 2016-04-08 at 17:06 -0400, Alexander Duyck wrote:
>> So these are the patches needed to enable tunnel segmentation
>> offloads on
>> the igb, igbvf, ixgbe, and ixgbevf drivers.  In addition this patch
>> extends
>> the i40e and i40evf drivers to include segmentation support for
>> tunnels
>> with outer checksums.
>>
>> The net performance gain for these patches are pretty significant.
>> In the
>> case of i40e a tunnel with outer checksums showed the following
>> improvement:
>> Throughput Throughput  Local Local   Result
>>            Units       CPU   Service Tag
>>                        Util  Demand
>>                        %
>> 14066.29   10^6bits/s  3.49  0.651   "before"
>> 20618.16   10^6bits/s  3.09  0.393   "after"
>>
>> For ixgbe similar results were seen:
>> Throughput Throughput  Local  Local   Result
>>            Units       CPU    Service Tag
>>                        Util   Demand
>>                        %
>> 12879.89   10^6bits/s  10.00  0.763   "before"
>> 14286.77   10^6bits/s  5.74   0.395   "after"
>>
>> These patches all rely on the TSO_MANGLEID and GSO_PARTIAL patches so
>> I
>> would not recommend applying them until those patches have first been
>> applied.
>
> Sorry I did not see this until after I tried applying your series. :-(
>
> Maybe the two dependent patches should have been in the series, so I
> and others do not waste their time.  Or not send this until the two
> patches were accepted.

Sorry I meant to send these as an RFC but sent it out with the
next-queue tag as I had gotten a bit distracted.

I shouldn't need to resubmit these until the other patches are
accepted so I will probably follow that route.

Thanks.

- Alex

[Intel-wired-lan] [next-queue PATCH 0/3] Add support for GSO partial to Intel NIC drivers

[Alexander Duyck]

On Fri, Apr 8, 2016 at 11:59 PM, Jeff Kirsher
<jeffrey.t.kirsher@intel.com> wrote:
> On Fri, 2016-04-08 at 17:06 -0400, Alexander Duyck wrote:
>> So these are the patches needed to enable tunnel segmentation
>> offloads on
>> the igb, igbvf, ixgbe, and ixgbevf drivers.  In addition this patch
>> extends
>> the i40e and i40evf drivers to include segmentation support for
>> tunnels
>> with outer checksums.
>>
>> The net performance gain for these patches are pretty significant.
>> In the
>> case of i40e a tunnel with outer checksums showed the following
>> improvement:
>> Throughput Throughput  Local Local   Result
>>            Units       CPU   Service Tag
>>                        Util  Demand
>>                        %
>> 14066.29   10^6bits/s  3.49  0.651   "before"
>> 20618.16   10^6bits/s  3.09  0.393   "after"
>>
>> For ixgbe similar results were seen:
>> Throughput Throughput  Local  Local   Result
>>            Units       CPU    Service Tag
>>                        Util   Demand
>>                        %
>> 12879.89   10^6bits/s  10.00  0.763   "before"
>> 14286.77   10^6bits/s  5.74   0.395   "after"
>>
>> These patches all rely on the TSO_MANGLEID and GSO_PARTIAL patches so
>> I
>> would not recommend applying them until those patches have first been
>> applied.
>
> Sorry I did not see this until after I tried applying your series. :-(
>
> Maybe the two dependent patches should have been in the series, so I
> and others do not waste their time.  Or not send this until the two
> patches were accepted.

Sorry I meant to send these as an RFC but sent it out with the
next-queue tag as I had gotten a bit distracted.

I shouldn't need to resubmit these until the other patches are
accepted so I will probably follow that route.

Thanks.

- Alex