[Intel-wired-lan] [next PATCH v2 0/4] Add support for generic Tx checksums to igb, ixgbe, igbvf, ixgbevf

[Intel-wired-lan] [next PATCH v2 0/4] Add support for generic Tx checksums to igb, ixgbe, igbvf, ixgbevf

[Alexander Duyck]

It turns out we were doing far more than we needed to in the Tx checksum
functions for the drivers.  As a result it hid the fact that the hardware
is actually much more capable of handling generic offloads then previously
realized.

This patch series enables generic Tx checksum support for igb and ixgbe
based Intel server adapters.  In addition it adds a number of other items
such as:
  Inner checksum support for MPLS
  Encapsulated checksum support for igb, igbvf, and ixgbevf
  SCTP CRC offload support for VLAN tunnels, and VFs
  IPv6 extension header support for igb and igbvf

v2: Fixed whitespace errors in igbvf patch.
    Updated patch descriptions to wrap lines at 75 characters.

---

Alexander Duyck (4):
      ixgbe: Add support for generic Tx checksums
      ixgbevf: Add support for generic Tx checksums
      igb: Add support for generic Tx checksums
      igbvf: Add support for generic Tx checksums


 drivers/net/ethernet/intel/igb/igb_main.c         |  114 ++++++---------
 drivers/net/ethernet/intel/igbvf/netdev.c         |  142 ++++++++++--------
 drivers/net/ethernet/intel/igbvf/vf.h             |    1 
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c     |  163 ++++++++-------------
 drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c |  104 ++++++-------
 5 files changed, 231 insertions(+), 293 deletions(-)

--

[Intel-wired-lan] [next PATCH v2 1/4] ixgbe: Add support for generic Tx checksums

[Alexander Duyck]

This patch adds support for generic Tx checksums to the ixgbe driver.  It
turns out this is actually pretty easy after going over the datasheet as we
were doing a number of steps we didn't need to.

In order to perform a Tx checksum for an L4 header we need to fill in the
following fields in the Tx descriptor:
  MACLEN (maximum of 127), retrieved from:
		skb_network_offset()
  IPLEN  (maximum of 511), retrieved from:
		skb_checksum_start_offset() - skb_network_offset()
  TUCMD.L4T indicates offset and if checksum or crc32c, based on:
		skb->csum_offset

The added advantage to doing this is that we can support inner checksum
offloads for tunnels and MPLS while still being able to transparently
insert VLAN tags.

I also took the opportunity to clean-up many of the feature flag
configuration bits to make them a bit more consistent between drivers.

Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c |  163 +++++++++----------------
 1 file changed, 59 insertions(+), 104 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 77cdaed6de90..1e3a548cc612 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -7207,103 +7207,61 @@ static int ixgbe_tso(struct ixgbe_ring *tx_ring,
 	return 1;
 }
 
+static inline bool ixgbe_ipv6_csum_is_sctp(struct sk_buff *skb)
+{
+	unsigned int offset = 0;
+
+	ipv6_find_hdr(skb, &offset, IPPROTO_SCTP, NULL, NULL);
+
+	return offset == skb_checksum_start_offset(skb);
+}
+
 static void ixgbe_tx_csum(struct ixgbe_ring *tx_ring,
 			  struct ixgbe_tx_buffer *first)
 {
 	struct sk_buff *skb = first->skb;
 	u32 vlan_macip_lens = 0;
-	u32 mss_l4len_idx = 0;
 	u32 type_tucmd = 0;
 
 	if (skb->ip_summed != CHECKSUM_PARTIAL) {
-		if (!(first->tx_flags & IXGBE_TX_FLAGS_HW_VLAN) &&
-		    !(first->tx_flags & IXGBE_TX_FLAGS_CC))
+csum_failed:
+		if (!(first->tx_flags & (IXGBE_TX_FLAGS_HW_VLAN |
+					 IXGBE_TX_FLAGS_CC)))
 			return;
-		vlan_macip_lens = skb_network_offset(skb) <<
-				  IXGBE_ADVTXD_MACLEN_SHIFT;
-	} else {
-		u8 l4_hdr = 0;
-		union {
-			struct iphdr *ipv4;
-			struct ipv6hdr *ipv6;
-			u8 *raw;
-		} network_hdr;
-		union {
-			struct tcphdr *tcphdr;
-			u8 *raw;
-		} transport_hdr;
-		__be16 frag_off;
-
-		if (skb->encapsulation) {
-			network_hdr.raw = skb_inner_network_header(skb);
-			transport_hdr.raw = skb_inner_transport_header(skb);
-			vlan_macip_lens = skb_inner_network_offset(skb) <<
-					  IXGBE_ADVTXD_MACLEN_SHIFT;
-		} else {
-			network_hdr.raw = skb_network_header(skb);
-			transport_hdr.raw = skb_transport_header(skb);
-			vlan_macip_lens = skb_network_offset(skb) <<
-					  IXGBE_ADVTXD_MACLEN_SHIFT;
-		}
-
-		/* use first 4 bits to determine IP version */
-		switch (network_hdr.ipv4->version) {
-		case IPVERSION:
-			vlan_macip_lens |= transport_hdr.raw - network_hdr.raw;
-			type_tucmd |= IXGBE_ADVTXD_TUCMD_IPV4;
-			l4_hdr = network_hdr.ipv4->protocol;
-			break;
-		case 6:
-			vlan_macip_lens |= transport_hdr.raw - network_hdr.raw;
-			l4_hdr = network_hdr.ipv6->nexthdr;
-			if (likely((transport_hdr.raw - network_hdr.raw) ==
-				   sizeof(struct ipv6hdr)))
-				break;
-			ipv6_skip_exthdr(skb, network_hdr.raw - skb->data +
-					      sizeof(struct ipv6hdr),
-					 &l4_hdr, &frag_off);
-			if (unlikely(frag_off))
-				l4_hdr = NEXTHDR_FRAGMENT;
-			break;
-		default:
-			break;
-		}
+		goto no_csum;
+	}
 
-		switch (l4_hdr) {
-		case IPPROTO_TCP:
-			type_tucmd |= IXGBE_ADVTXD_TUCMD_L4T_TCP;
-			mss_l4len_idx = (transport_hdr.tcphdr->doff * 4) <<
-					IXGBE_ADVTXD_L4LEN_SHIFT;
-			break;
-		case IPPROTO_SCTP:
-			type_tucmd |= IXGBE_ADVTXD_TUCMD_L4T_SCTP;
-			mss_l4len_idx = sizeof(struct sctphdr) <<
-					IXGBE_ADVTXD_L4LEN_SHIFT;
-			break;
-		case IPPROTO_UDP:
-			mss_l4len_idx = sizeof(struct udphdr) <<
-					IXGBE_ADVTXD_L4LEN_SHIFT;
+	switch (skb->csum_offset) {
+	case offsetof(struct tcphdr, check):
+		type_tucmd = IXGBE_ADVTXD_TUCMD_L4T_TCP;
+		/* fall through */
+	case offsetof(struct udphdr, check):
+		break;
+	case offsetof(struct sctphdr, checksum):
+		/* validate that this is actually an SCTP request */
+		if (((first->protocol == htons(ETH_P_IP)) &&
+		     (ip_hdr(skb)->protocol == IPPROTO_SCTP)) ||
+		    ((first->protocol == htons(ETH_P_IPV6)) &&
+		     ixgbe_ipv6_csum_is_sctp(skb))) {
+			type_tucmd = IXGBE_ADVTXD_TUCMD_L4T_SCTP;
 			break;
-		default:
-			if (unlikely(net_ratelimit())) {
-				dev_warn(tx_ring->dev,
-					 "partial checksum, version=%d, l4 proto=%x\n",
-					 network_hdr.ipv4->version, l4_hdr);
-			}
-			skb_checksum_help(skb);
-			goto no_csum;
 		}
-
-		/* update TX checksum flag */
-		first->tx_flags |= IXGBE_TX_FLAGS_CSUM;
+		/* fall through */
+	default:
+		skb_checksum_help(skb);
+		goto csum_failed;
 	}
 
+	/* update TX checksum flag */
+	first->tx_flags |= IXGBE_TX_FLAGS_CSUM;
+	vlan_macip_lens = skb_checksum_start_offset(skb) -
+			  skb_network_offset(skb);
 no_csum:
 	/* vlan_macip_lens: MACLEN, VLAN tag */
+	vlan_macip_lens |= skb_network_offset(skb) << 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, mss_l4len_idx);
+	ixgbe_tx_ctxtdesc(tx_ring, vlan_macip_lens, 0, type_tucmd, 0);
 }
 
 #define IXGBE_SET_FLAG(_input, _flag, _result) \
@@ -9012,40 +8970,37 @@ skip_sriov:
 
 #endif
 	netdev->features = NETIF_F_SG |
-			   NETIF_F_IP_CSUM |
-			   NETIF_F_IPV6_CSUM |
-			   NETIF_F_HW_VLAN_CTAG_TX |
-			   NETIF_F_HW_VLAN_CTAG_RX |
 			   NETIF_F_TSO |
 			   NETIF_F_TSO6 |
 			   NETIF_F_RXHASH |
-			   NETIF_F_RXCSUM;
-
-	netdev->hw_features = netdev->features | NETIF_F_HW_L2FW_DOFFLOAD;
+			   NETIF_F_RXCSUM |
+			   NETIF_F_HW_CSUM |
+			   NETIF_F_SCTP_CRC |
+			   NETIF_F_HW_VLAN_CTAG_TX |
+			   NETIF_F_HW_VLAN_CTAG_RX;
 
-	switch (adapter->hw.mac.type) {
-	case ixgbe_mac_82599EB:
-	case ixgbe_mac_X540:
-	case ixgbe_mac_X550:
-	case ixgbe_mac_X550EM_x:
+	if (hw->mac.type >= ixgbe_mac_82599EB)
 		netdev->features |= NETIF_F_SCTP_CRC;
-		netdev->hw_features |= NETIF_F_SCTP_CRC |
-				       NETIF_F_NTUPLE;
-		break;
-	default:
-		break;
-	}
 
-	netdev->hw_features |= NETIF_F_RXALL;
+	/* copy netdev features into list of user selectable features */
+	netdev->hw_features |= netdev->features;
+	netdev->hw_features |= NETIF_F_RXALL |
+			       NETIF_F_HW_L2FW_DOFFLOAD;
+
+	if (hw->mac.type >= ixgbe_mac_82599EB)
+		netdev->hw_features |= NETIF_F_NTUPLE;
+
+	/* set this bit last since it cannot be part of hw_features */
 	netdev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
 
-	netdev->vlan_features |= NETIF_F_TSO;
-	netdev->vlan_features |= NETIF_F_TSO6;
-	netdev->vlan_features |= NETIF_F_IP_CSUM;
-	netdev->vlan_features |= NETIF_F_IPV6_CSUM;
-	netdev->vlan_features |= NETIF_F_SG;
+	netdev->vlan_features |= NETIF_F_SG |
+				 NETIF_F_TSO |
+				 NETIF_F_TSO6 |
+				 NETIF_F_HW_CSUM |
+				 NETIF_F_SCTP_CRC;
 
-	netdev->hw_enc_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
+	netdev->mpls_features |= NETIF_F_HW_CSUM;
+	netdev->hw_enc_features |= NETIF_F_HW_CSUM;
 
 	netdev->priv_flags |= IFF_UNICAST_FLT;
 	netdev->priv_flags |= IFF_SUPP_NOFCS;

[Intel-wired-lan] [next PATCH v2 2/4] ixgbevf: Add support for generic Tx checksums

[Alexander Duyck]

This patch adds support for generic Tx checksums to the ixgbevf driver.  It
turns out this is actually pretty easy after going over the datasheet as we
were doing a number of steps we didn't need to.

In order to perform a Tx checksum for an L4 header we need to fill in the
following fields in the Tx descriptor:
  MACLEN (maximum of 127), retrieved from:
		skb_network_offset()
  IPLEN  (maximum of 511), retrieved from:
		skb_checksum_start_offset() - skb_network_offset()
  TUCMD.L4T indicates offset and if checksum or crc32c, based on:
		skb->csum_offset

The added advantage to doing this is that we can support inner checksum
offloads for tunnels and MPLS while still being able to transparently
insert VLAN tags.

I also took the opportunity to clean-up many of the feature flag
configuration bits to make them a bit more consistent between drivers.  In
the case of the VF drivers this meant adding support for SCTP CRCs, and
inner checksum offloads for MPLS and various tunnel types.

Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
---
 drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c |  104 +++++++++------------
 1 file changed, 43 insertions(+), 61 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
index 0b451d9eddb0..e58bebf6ea1d 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
@@ -3334,76 +3334,55 @@ static int ixgbevf_tso(struct ixgbevf_ring *tx_ring,
 	return 1;
 }
 
+static inline bool ixgbevf_ipv6_csum_is_sctp(struct sk_buff *skb)
+{
+	unsigned int offset = 0;
+
+	ipv6_find_hdr(skb, &offset, IPPROTO_SCTP, NULL, NULL);
+
+	return offset == skb_checksum_start_offset(skb);
+}
+
 static void ixgbevf_tx_csum(struct ixgbevf_ring *tx_ring,
 			    struct ixgbevf_tx_buffer *first)
 {
 	struct sk_buff *skb = first->skb;
 	u32 vlan_macip_lens = 0;
-	u32 mss_l4len_idx = 0;
 	u32 type_tucmd = 0;
 
-	if (skb->ip_summed == CHECKSUM_PARTIAL) {
-		u8 l4_hdr = 0;
-		__be16 frag_off;
-
-		switch (first->protocol) {
-		case htons(ETH_P_IP):
-			vlan_macip_lens |= skb_network_header_len(skb);
-			type_tucmd |= IXGBE_ADVTXD_TUCMD_IPV4;
-			l4_hdr = ip_hdr(skb)->protocol;
-			break;
-		case htons(ETH_P_IPV6):
-			vlan_macip_lens |= skb_network_header_len(skb);
-			l4_hdr = ipv6_hdr(skb)->nexthdr;
-			if (likely(skb_network_header_len(skb) ==
-				   sizeof(struct ipv6hdr)))
-				break;
-			ipv6_skip_exthdr(skb, skb_network_offset(skb) +
-					      sizeof(struct ipv6hdr),
-					 &l4_hdr, &frag_off);
-			if (unlikely(frag_off))
-				l4_hdr = NEXTHDR_FRAGMENT;
-			break;
-		default:
-			break;
-		}
+	if (skb->ip_summed != CHECKSUM_PARTIAL)
+		goto no_csum;
 
-		switch (l4_hdr) {
-		case IPPROTO_TCP:
-			type_tucmd |= IXGBE_ADVTXD_TUCMD_L4T_TCP;
-			mss_l4len_idx = tcp_hdrlen(skb) <<
-					IXGBE_ADVTXD_L4LEN_SHIFT;
-			break;
-		case IPPROTO_SCTP:
-			type_tucmd |= IXGBE_ADVTXD_TUCMD_L4T_SCTP;
-			mss_l4len_idx = sizeof(struct sctphdr) <<
-					IXGBE_ADVTXD_L4LEN_SHIFT;
-			break;
-		case IPPROTO_UDP:
-			mss_l4len_idx = sizeof(struct udphdr) <<
-					IXGBE_ADVTXD_L4LEN_SHIFT;
+	switch (skb->csum_offset) {
+	case offsetof(struct tcphdr, check):
+		type_tucmd = IXGBE_ADVTXD_TUCMD_L4T_TCP;
+		/* fall through */
+	case offsetof(struct udphdr, check):
+		break;
+	case offsetof(struct sctphdr, checksum):
+		/* validate that this is actually an SCTP request */
+		if (((first->protocol == htons(ETH_P_IP)) &&
+		     (ip_hdr(skb)->protocol == IPPROTO_SCTP)) ||
+		    ((first->protocol == htons(ETH_P_IPV6)) &&
+		     ixgbevf_ipv6_csum_is_sctp(skb))) {
+			type_tucmd = IXGBE_ADVTXD_TUCMD_L4T_SCTP;
 			break;
-		default:
-			if (unlikely(net_ratelimit())) {
-				dev_warn(tx_ring->dev,
-					 "partial checksum, l3 proto=%x, l4 proto=%x\n",
-					 first->protocol, l4_hdr);
-			}
-			skb_checksum_help(skb);
-			goto no_csum;
 		}
-
-		/* update TX checksum flag */
-		first->tx_flags |= IXGBE_TX_FLAGS_CSUM;
+		/* fall through */
+	default:
+		skb_checksum_help(skb);
+		goto no_csum;
 	}
-
+	/* update TX checksum flag */
+	first->tx_flags |= IXGBE_TX_FLAGS_CSUM;
+	vlan_macip_lens = skb_checksum_start_offset(skb) -
+			  skb_network_offset(skb);
 no_csum:
 	/* vlan_macip_lens: MACLEN, VLAN tag */
 	vlan_macip_lens |= skb_network_offset(skb) << IXGBE_ADVTXD_MACLEN_SHIFT;
 	vlan_macip_lens |= first->tx_flags & IXGBE_TX_FLAGS_VLAN_MASK;
 
-	ixgbevf_tx_ctxtdesc(tx_ring, vlan_macip_lens,
-			    type_tucmd, mss_l4len_idx);
+	ixgbevf_tx_ctxtdesc(tx_ring, vlan_macip_lens, type_tucmd, 0);
 }
 
 static __le32 ixgbevf_tx_cmd_type(u32 tx_flags)
@@ -4006,22 +3985,25 @@ static int ixgbevf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	}
 
 	netdev->hw_features = NETIF_F_SG |
-			      NETIF_F_IP_CSUM |
-			      NETIF_F_IPV6_CSUM |
 			      NETIF_F_TSO |
 			      NETIF_F_TSO6 |
-			      NETIF_F_RXCSUM;
+			      NETIF_F_RXCSUM |
+			      NETIF_F_HW_CSUM |
+			      NETIF_F_SCTP_CRC;
 
 	netdev->features = netdev->hw_features |
 			   NETIF_F_HW_VLAN_CTAG_TX |
 			   NETIF_F_HW_VLAN_CTAG_RX |
 			   NETIF_F_HW_VLAN_CTAG_FILTER;
 
-	netdev->vlan_features |= NETIF_F_TSO |
+	netdev->vlan_features |= NETIF_F_SG |
+				 NETIF_F_TSO |
 				 NETIF_F_TSO6 |
-				 NETIF_F_IP_CSUM |
-				 NETIF_F_IPV6_CSUM |
-				 NETIF_F_SG;
+				 NETIF_F_HW_CSUM |
+				 NETIF_F_SCTP_CRC;
+
+	netdev->mpls_features |= NETIF_F_HW_CSUM;
+	netdev->hw_enc_features |= NETIF_F_HW_CSUM;
 
 	if (pci_using_dac)
 		netdev->features |= NETIF_F_HIGHDMA;

[Intel-wired-lan] [next PATCH v2 3/4] igb: Add support for generic Tx checksums

[Alexander Duyck]

This patch adds support for generic Tx checksums to the igb driver.  It
turns out this is actually pretty easy after going over the datasheet as we
were doing a number of steps we didn't need to.

In order to perform a Tx checksum for an L4 header we need to fill in the
following fields in the Tx descriptor:
  MACLEN (maximum of 127), retrieved from:
		skb_network_offset()
  IPLEN  (maximum of 511), retrieved from:
		skb_checksum_start_offset() - skb_network_offset()
  TUCMD.L4T indicates offset and if checksum or crc32c, based on:
		skb->csum_offset

The added advantage to doing this is that we can support inner checksum
offloads for tunnels and MPLS while still being able to transparently
insert VLAN tags.

I also took the opportunity to clean-up many of the feature flag
configuration bits to make them a bit more consistent between drivers.

Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
---
 drivers/net/ethernet/intel/igb/igb_main.c |  114 ++++++++++++-----------------
 1 file changed, 47 insertions(+), 67 deletions(-)

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index ade8dee55fb8..8cd71cf39001 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -2437,37 +2437,35 @@ static int igb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	 * assignment.
 	 */
 	netdev->features |= NETIF_F_SG |
-			    NETIF_F_IP_CSUM |
-			    NETIF_F_IPV6_CSUM |
 			    NETIF_F_TSO |
 			    NETIF_F_TSO6 |
 			    NETIF_F_RXHASH |
 			    NETIF_F_RXCSUM |
+			    NETIF_F_HW_CSUM |
 			    NETIF_F_HW_VLAN_CTAG_RX |
 			    NETIF_F_HW_VLAN_CTAG_TX;
 
+	if (hw->mac.type >= e1000_82576)
+		netdev->features |= NETIF_F_SCTP_CRC;
+
 	/* copy netdev features into list of user selectable features */
 	netdev->hw_features |= netdev->features;
 	netdev->hw_features |= NETIF_F_RXALL;
 
+	if (hw->mac.type >= e1000_i350)
+		netdev->hw_features |= NETIF_F_NTUPLE;
+
 	/* set this bit last since it cannot be part of hw_features */
 	netdev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
 
-	netdev->vlan_features |= NETIF_F_TSO |
+	netdev->vlan_features |= NETIF_F_SG |
+				 NETIF_F_TSO |
 				 NETIF_F_TSO6 |
-				 NETIF_F_IP_CSUM |
-				 NETIF_F_IPV6_CSUM |
-				 NETIF_F_SG;
+				 NETIF_F_HW_CSUM |
+				 NETIF_F_SCTP_CRC;
 
-	switch (hw->mac.type) {
-	case e1000_i210:
-	case e1000_i211:
-	case e1000_i350:
-		netdev->hw_features |= NETIF_F_NTUPLE;
-		break;
-	default:
-		break;
-	}
+	netdev->mpls_features |= NETIF_F_HW_CSUM;
+	netdev->hw_enc_features |= NETIF_F_HW_CSUM;
 
 	netdev->priv_flags |= IFF_SUPP_NOFCS;
 
@@ -2476,11 +2474,6 @@ static int igb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 		netdev->vlan_features |= NETIF_F_HIGHDMA;
 	}
 
-	if (hw->mac.type >= e1000_82576) {
-		netdev->hw_features |= NETIF_F_SCTP_CRC;
-		netdev->features |= NETIF_F_SCTP_CRC;
-	}
-
 	netdev->priv_flags |= IFF_UNICAST_FLT;
 
 	adapter->en_mng_pt = igb_enable_mng_pass_thru(hw);
@@ -4967,70 +4960,57 @@ static int igb_tso(struct igb_ring *tx_ring,
 	return 1;
 }
 
+static inline bool igb_ipv6_csum_is_sctp(struct sk_buff *skb)
+{
+	unsigned int offset = 0;
+
+	ipv6_find_hdr(skb, &offset, IPPROTO_SCTP, NULL, NULL);
+
+	return offset == skb_checksum_start_offset(skb);
+}
+
 static void igb_tx_csum(struct igb_ring *tx_ring, struct igb_tx_buffer *first)
 {
 	struct sk_buff *skb = first->skb;
 	u32 vlan_macip_lens = 0;
-	u32 mss_l4len_idx = 0;
 	u32 type_tucmd = 0;
 
 	if (skb->ip_summed != CHECKSUM_PARTIAL) {
+csum_failed:
 		if (!(first->tx_flags & IGB_TX_FLAGS_VLAN))
 			return;
-	} else {
-		u8 l4_hdr = 0;
-
-		switch (first->protocol) {
-		case htons(ETH_P_IP):
-			vlan_macip_lens |= skb_network_header_len(skb);
-			type_tucmd |= E1000_ADVTXD_TUCMD_IPV4;
-			l4_hdr = ip_hdr(skb)->protocol;
-			break;
-		case htons(ETH_P_IPV6):
-			vlan_macip_lens |= skb_network_header_len(skb);
-			l4_hdr = ipv6_hdr(skb)->nexthdr;
-			break;
-		default:
-			if (unlikely(net_ratelimit())) {
-				dev_warn(tx_ring->dev,
-					 "partial checksum but proto=%x!\n",
-					 first->protocol);
-			}
-			break;
-		}
+		goto no_csum;
+	}
 
-		switch (l4_hdr) {
-		case IPPROTO_TCP:
-			type_tucmd |= E1000_ADVTXD_TUCMD_L4T_TCP;
-			mss_l4len_idx = tcp_hdrlen(skb) <<
-					E1000_ADVTXD_L4LEN_SHIFT;
-			break;
-		case IPPROTO_SCTP:
-			type_tucmd |= E1000_ADVTXD_TUCMD_L4T_SCTP;
-			mss_l4len_idx = sizeof(struct sctphdr) <<
-					E1000_ADVTXD_L4LEN_SHIFT;
-			break;
-		case IPPROTO_UDP:
-			mss_l4len_idx = sizeof(struct udphdr) <<
-					E1000_ADVTXD_L4LEN_SHIFT;
-			break;
-		default:
-			if (unlikely(net_ratelimit())) {
-				dev_warn(tx_ring->dev,
-					 "partial checksum but l4 proto=%x!\n",
-					 l4_hdr);
-			}
+	switch (skb->csum_offset) {
+	case offsetof(struct tcphdr, check):
+		type_tucmd = E1000_ADVTXD_TUCMD_L4T_TCP;
+		/* fall through */
+	case offsetof(struct udphdr, check):
+		break;
+	case offsetof(struct sctphdr, checksum):
+		/* validate that this is actually an SCTP request */
+		if (((first->protocol == htons(ETH_P_IP)) &&
+		     (ip_hdr(skb)->protocol == IPPROTO_SCTP)) ||
+		    ((first->protocol == htons(ETH_P_IPV6)) &&
+		     igb_ipv6_csum_is_sctp(skb))) {
+			type_tucmd = E1000_ADVTXD_TUCMD_L4T_SCTP;
 			break;
 		}
-
-		/* update TX checksum flag */
-		first->tx_flags |= IGB_TX_FLAGS_CSUM;
+	default:
+		skb_checksum_help(skb);
+		goto csum_failed;
 	}
 
+	/* update TX checksum flag */
+	first->tx_flags |= IGB_TX_FLAGS_CSUM;
+	vlan_macip_lens = skb_checksum_start_offset(skb) -
+			  skb_network_offset(skb);
+no_csum:
 	vlan_macip_lens |= skb_network_offset(skb) << 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);
+	igb_tx_ctxtdesc(tx_ring, vlan_macip_lens, type_tucmd, 0);
 }
 
 #define IGB_SET_FLAG(_input, _flag, _result) \

[Intel-wired-lan] [next PATCH v2 4/4] igbvf: Add support for generic Tx checksums

[Alexander Duyck]

This patch adds support for generic Tx checksums to the igbvf driver.  It
turns out this is actually pretty easy after going over the datasheet as we
were doing a number of steps we didn't need to.

In order to perform a Tx checksum for an L4 header we need to fill in the
following fields in the Tx descriptor:
  MACLEN (maximum of 127), retrieved from:
		skb_network_offset()
  IPLEN  (maximum of 511), retrieved from:
		skb_checksum_start_offset() - skb_network_offset()
  TUCMD.L4T indicates offset and if checksum or crc32c, based on:
		skb->csum_offset

The added advantage to doing this is that we can support inner checksum
offloads for tunnels and MPLS while still being able to transparently
insert VLAN tags.

I also took the opportunity to clean-up many of the feature flag
configuration bits to make them a bit more consistent between drivers.  In
the case of the VF drivers this meant adding support for SCTP CRCs, and
inner checksum offloads for MPLS and various tunnel types.

Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
---
 drivers/net/ethernet/intel/igbvf/netdev.c |  142 +++++++++++++++++------------
 drivers/net/ethernet/intel/igbvf/vf.h     |    1 
 2 files changed, 82 insertions(+), 61 deletions(-)

diff --git a/drivers/net/ethernet/intel/igbvf/netdev.c b/drivers/net/ethernet/intel/igbvf/netdev.c
index 297af801f051..aa3486556630 100644
--- a/drivers/net/ethernet/intel/igbvf/netdev.c
+++ b/drivers/net/ethernet/intel/igbvf/netdev.c
@@ -43,6 +43,7 @@
 #include <linux/ethtool.h>
 #include <linux/if_vlan.h>
 #include <linux/prefetch.h>
+#include <linux/sctp.h>
 
 #include "igbvf.h"
 
@@ -1908,6 +1909,31 @@ static void igbvf_watchdog_task(struct work_struct *work)
 #define IGBVF_TX_FLAGS_VLAN_MASK	0xffff0000
 #define IGBVF_TX_FLAGS_VLAN_SHIFT	16
 
+static void igbvf_tx_ctxtdesc(struct igbvf_ring *tx_ring, u32 vlan_macip_lens,
+			      u32 type_tucmd, u32 mss_l4len_idx)
+{
+	struct e1000_adv_tx_context_desc *context_desc;
+	struct igbvf_buffer *buffer_info;
+	u16 i = tx_ring->next_to_use;
+
+	context_desc = IGBVF_TX_CTXTDESC_ADV(*tx_ring, i);
+	buffer_info = &tx_ring->buffer_info[i];
+
+	i++;
+	tx_ring->next_to_use = (i < tx_ring->count) ? i : 0;
+
+	/* set bits to identify this as an advanced context descriptor */
+	type_tucmd |= E1000_TXD_CMD_DEXT | E1000_ADVTXD_DTYP_CTXT;
+
+	context_desc->vlan_macip_lens	= cpu_to_le32(vlan_macip_lens);
+	context_desc->seqnum_seed	= 0;
+	context_desc->type_tucmd_mlhl	= cpu_to_le32(type_tucmd);
+	context_desc->mss_l4len_idx	= cpu_to_le32(mss_l4len_idx);
+
+	buffer_info->time_stamp = jiffies;
+	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,
@@ -1987,65 +2013,56 @@ static int igbvf_tso(struct igbvf_adapter *adapter,
 	return true;
 }
 
-static inline bool igbvf_tx_csum(struct igbvf_adapter *adapter,
-				 struct igbvf_ring *tx_ring,
-				 struct sk_buff *skb, u32 tx_flags,
-				 __be16 protocol)
+static inline bool igbvf_ipv6_csum_is_sctp(struct sk_buff *skb)
 {
-	struct e1000_adv_tx_context_desc *context_desc;
-	unsigned int i;
-	struct igbvf_buffer *buffer_info;
-	u32 info = 0, tu_cmd = 0;
-
-	if ((skb->ip_summed == CHECKSUM_PARTIAL) ||
-	    (tx_flags & IGBVF_TX_FLAGS_VLAN)) {
-		i = tx_ring->next_to_use;
-		buffer_info = &tx_ring->buffer_info[i];
-		context_desc = IGBVF_TX_CTXTDESC_ADV(*tx_ring, i);
+	unsigned int offset = 0;
 
-		if (tx_flags & IGBVF_TX_FLAGS_VLAN)
-			info |= (tx_flags & IGBVF_TX_FLAGS_VLAN_MASK);
+	ipv6_find_hdr(skb, &offset, IPPROTO_SCTP, NULL, NULL);
 
-		info |= (skb_network_offset(skb) << E1000_ADVTXD_MACLEN_SHIFT);
-		if (skb->ip_summed == CHECKSUM_PARTIAL)
-			info |= (skb_transport_header(skb) -
-				 skb_network_header(skb));
+	return offset == skb_checksum_start_offset(skb);
+}
 
-		context_desc->vlan_macip_lens = cpu_to_le32(info);
+static bool igbvf_tx_csum(struct igbvf_ring *tx_ring, struct sk_buff *skb,
+			  u32 tx_flags, __be16 protocol)
+{
+	u32 vlan_macip_lens = 0;
+	u32 type_tucmd = 0;
 
-		tu_cmd |= (E1000_TXD_CMD_DEXT | E1000_ADVTXD_DTYP_CTXT);
+	if (skb->ip_summed != CHECKSUM_PARTIAL) {
+csum_failed:
+		if (!(tx_flags & IGBVF_TX_FLAGS_VLAN))
+			return false;
+		goto no_csum;
+	}
 
-		if (skb->ip_summed == CHECKSUM_PARTIAL) {
-			switch (protocol) {
-			case htons(ETH_P_IP):
-				tu_cmd |= E1000_ADVTXD_TUCMD_IPV4;
-				if (ip_hdr(skb)->protocol == IPPROTO_TCP)
-					tu_cmd |= E1000_ADVTXD_TUCMD_L4T_TCP;
-				break;
-			case htons(ETH_P_IPV6):
-				if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
-					tu_cmd |= E1000_ADVTXD_TUCMD_L4T_TCP;
-				break;
-			default:
-				break;
-			}
+	switch (skb->csum_offset) {
+	case offsetof(struct tcphdr, check):
+		type_tucmd = E1000_ADVTXD_TUCMD_L4T_TCP;
+		/* fall through */
+	case offsetof(struct udphdr, check):
+		break;
+	case offsetof(struct sctphdr, checksum):
+		/* validate that this is actually an SCTP request */
+		if (((protocol == htons(ETH_P_IP)) &&
+		     (ip_hdr(skb)->protocol == IPPROTO_SCTP)) ||
+		    ((protocol == htons(ETH_P_IPV6)) &&
+		     igbvf_ipv6_csum_is_sctp(skb))) {
+			type_tucmd = E1000_ADVTXD_TUCMD_L4T_SCTP;
+			break;
 		}
-
-		context_desc->type_tucmd_mlhl = cpu_to_le32(tu_cmd);
-		context_desc->seqnum_seed = 0;
-		context_desc->mss_l4len_idx = 0;
-
-		buffer_info->time_stamp = jiffies;
-		buffer_info->dma = 0;
-		i++;
-		if (i == tx_ring->count)
-			i = 0;
-		tx_ring->next_to_use = i;
-
-		return true;
+	default:
+		skb_checksum_help(skb);
+		goto csum_failed;
 	}
 
-	return false;
+	vlan_macip_lens = skb_checksum_start_offset(skb) -
+			  skb_network_offset(skb);
+no_csum:
+	vlan_macip_lens |= skb_network_offset(skb) << E1000_ADVTXD_MACLEN_SHIFT;
+	vlan_macip_lens |= tx_flags & IGBVF_TX_FLAGS_VLAN_MASK;
+
+	igbvf_tx_ctxtdesc(tx_ring, vlan_macip_lens, type_tucmd, 0);
+	return true;
 }
 
 static int igbvf_maybe_stop_tx(struct net_device *netdev, int size)
@@ -2264,7 +2281,7 @@ static netdev_tx_t igbvf_xmit_frame_ring_adv(struct sk_buff *skb,
 
 	if (tso)
 		tx_flags |= IGBVF_TX_FLAGS_TSO;
-	else if (igbvf_tx_csum(adapter, tx_ring, skb, tx_flags, protocol) &&
+	else if (igbvf_tx_csum(tx_ring, skb, tx_flags, protocol) &&
 		 (skb->ip_summed == CHECKSUM_PARTIAL))
 		tx_flags |= IGBVF_TX_FLAGS_CSUM;
 
@@ -2717,11 +2734,11 @@ static int igbvf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	adapter->bd_number = cards_found++;
 
 	netdev->hw_features = NETIF_F_SG |
-			   NETIF_F_IP_CSUM |
-			   NETIF_F_IPV6_CSUM |
-			   NETIF_F_TSO |
-			   NETIF_F_TSO6 |
-			   NETIF_F_RXCSUM;
+			      NETIF_F_TSO |
+			      NETIF_F_TSO6 |
+			      NETIF_F_RXCSUM |
+			      NETIF_F_HW_CSUM |
+			      NETIF_F_SCTP_CRC;
 
 	netdev->features = netdev->hw_features |
 			   NETIF_F_HW_VLAN_CTAG_TX |
@@ -2731,11 +2748,14 @@ static int igbvf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (pci_using_dac)
 		netdev->features |= NETIF_F_HIGHDMA;
 
-	netdev->vlan_features |= NETIF_F_TSO;
-	netdev->vlan_features |= NETIF_F_TSO6;
-	netdev->vlan_features |= NETIF_F_IP_CSUM;
-	netdev->vlan_features |= NETIF_F_IPV6_CSUM;
-	netdev->vlan_features |= NETIF_F_SG;
+	netdev->vlan_features |= NETIF_F_SG |
+				 NETIF_F_TSO |
+				 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;
 
 	/*reset the controller to put the device in a known good state */
 	err = hw->mac.ops.reset_hw(hw);
diff --git a/drivers/net/ethernet/intel/igbvf/vf.h b/drivers/net/ethernet/intel/igbvf/vf.h
index 0f1eca639f68..f00a41d9a1ca 100644
--- a/drivers/net/ethernet/intel/igbvf/vf.h
+++ b/drivers/net/ethernet/intel/igbvf/vf.h
@@ -126,6 +126,7 @@ struct e1000_adv_tx_context_desc {
 #define E1000_ADVTXD_MACLEN_SHIFT	9  /* Adv ctxt desc mac len shift */
 #define E1000_ADVTXD_TUCMD_IPV4		0x00000400 /* IP Packet Type: 1=IPv4 */
 #define E1000_ADVTXD_TUCMD_L4T_TCP	0x00000800 /* L4 Packet TYPE of TCP */
+#define E1000_ADVTXD_TUCMD_L4T_SCTP	0x00001000 /* L4 packet TYPE of SCTP */
 #define E1000_ADVTXD_L4LEN_SHIFT	8  /* Adv ctxt L4LEN shift */
 #define E1000_ADVTXD_MSS_SHIFT		16 /* Adv ctxt MSS shift */
 

[Intel-wired-lan] [next PATCH v2 3/4] igb: Add support for generic Tx checksums

[Brown, Aaron F]

> From: Intel-wired-lan [intel-wired-lan-bounces at lists.osuosl.org] on behalf of Alexander Duyck [aduyck at mirantis.com]
> Sent: Wednesday, January 13, 2016 7:31 AM
> To: intel-wired-lan at lists.osuosl.org
> Subject: [Intel-wired-lan] [next PATCH v2 3/4] igb: Add support for generic     Tx checksums
> 
> This patch adds support for generic Tx checksums to the igb driver.  It
> turns out this is actually pretty easy after going over the datasheet as we
> were doing a number of steps we didn't need to.
> 
> In order to perform a Tx checksum for an L4 header we need to fill in the
> following fields in the Tx descriptor:
>   MACLEN (maximum of 127), retrieved from:
>                 skb_network_offset()
>   IPLEN  (maximum of 511), retrieved from:
>                 skb_checksum_start_offset() - skb_network_offset()
>   TUCMD.L4T indicates offset and if checksum or crc32c, based on:
>                 skb->csum_offset
> 
> The added advantage to doing this is that we can support inner checksum
> offloads for tunnels and MPLS while still being able to transparently
> insert VLAN tags.
> 
> I also took the opportunity to clean-up many of the feature flag
> configuration bits to make them a bit more consistent between drivers.
> 
> Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
> ---
>  drivers/net/ethernet/intel/igb/igb_main.c |  114 ++++++++++++-----------------
>  1 file changed, 47 insertions(+), 67 deletions(-)

Tested-by: Aaron Brown <aaron.f.brown@intel.com>

[Intel-wired-lan] [next PATCH v2 4/4] igbvf: Add support for generic Tx checksums

[Brown, Aaron F]

> From: Intel-wired-lan [intel-wired-lan-bounces at lists.osuosl.org] on behalf of Alexander Duyck [aduyck at mirantis.com]
> Sent: Wednesday, January 13, 2016 7:31 AM
> To: intel-wired-lan at lists.osuosl.org
> Subject: [Intel-wired-lan] [next PATCH v2 4/4] igbvf: Add support for   generic Tx checksums
> 
> This patch adds support for generic Tx checksums to the igbvf driver.  It
> turns out this is actually pretty easy after going over the datasheet as we
> were doing a number of steps we didn't need to.
> 
> In order to perform a Tx checksum for an L4 header we need to fill in the
> following fields in the Tx descriptor:
>   MACLEN (maximum of 127), retrieved from:
>                 skb_network_offset()
>   IPLEN  (maximum of 511), retrieved from:
>                 skb_checksum_start_offset() - skb_network_offset()
>   TUCMD.L4T indicates offset and if checksum or crc32c, based on:
>                 skb->csum_offset
> 
> The added advantage to doing this is that we can support inner checksum
> offloads for tunnels and MPLS while still being able to transparently
> insert VLAN tags.
> 
> I also took the opportunity to clean-up many of the feature flag
> configuration bits to make them a bit more consistent between drivers.  In
> the case of the VF drivers this meant adding support for SCTP CRCs, and
> inner checksum offloads for MPLS and various tunnel types.
> 
> Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
> ---
>  drivers/net/ethernet/intel/igbvf/netdev.c |  142 +++++++++++++++++------------
>  drivers/net/ethernet/intel/igbvf/vf.h     |    1
>  2 files changed, 82 insertions(+), 61 deletions(-)

Tested-by: Aaron Brown <aaron.f.brown@intel.com>

[Intel-wired-lan] [next PATCH v2 2/4] ixgbevf: Add support for generic Tx checksums

[Bowers, AndrewX]

> -----Original Message-----
> From: Intel-wired-lan [mailto:intel-wired-lan-bounces at lists.osuosl.org] On
> Behalf Of Alexander Duyck
> Sent: Wednesday, January 13, 2016 7:31 AM
> To: intel-wired-lan at lists.osuosl.org
> Subject: [Intel-wired-lan] [next PATCH v2 2/4] ixgbevf: Add support for
> generic Tx checksums
> 
> This patch adds support for generic Tx checksums to the ixgbevf driver.  It
> turns out this is actually pretty easy after going over the datasheet as we
> were doing a number of steps we didn't need to.
> 
> In order to perform a Tx checksum for an L4 header we need to fill in the
> following fields in the Tx descriptor:
>   MACLEN (maximum of 127), retrieved from:
> 		skb_network_offset()
>   IPLEN  (maximum of 511), retrieved from:
> 		skb_checksum_start_offset() - skb_network_offset()
>   TUCMD.L4T indicates offset and if checksum or crc32c, based on:
> 		skb->csum_offset
> 
> The added advantage to doing this is that we can support inner checksum
> offloads for tunnels and MPLS while still being able to transparently insert
> VLAN tags.
> 
> I also took the opportunity to clean-up many of the feature flag configuration
> bits to make them a bit more consistent between drivers.  In the case of the
> VF drivers this meant adding support for SCTP CRCs, and inner checksum
> offloads for MPLS and various tunnel types.
> 
> Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
> ---
>  drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c |  104 +++++++++--------
> ----
>  1 file changed, 43 insertions(+), 61 deletions(-)

Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Ethtool shows generic checksum offload support, can be toggled.

[Intel-wired-lan] [next PATCH v2 1/4] ixgbe: Add support for generic Tx checksums

[Bowers, AndrewX]

> -----Original Message-----
> From: Intel-wired-lan [mailto:intel-wired-lan-bounces at lists.osuosl.org] On
> Behalf Of Alexander Duyck
> Sent: Wednesday, January 13, 2016 7:31 AM
> To: intel-wired-lan at lists.osuosl.org
> Subject: [Intel-wired-lan] [next PATCH v2 1/4] ixgbe: Add support for generic
> Tx checksums
> 
> This patch adds support for generic Tx checksums to the ixgbe driver.  It turns
> out this is actually pretty easy after going over the datasheet as we were
> doing a number of steps we didn't need to.
> 
> In order to perform a Tx checksum for an L4 header we need to fill in the
> following fields in the Tx descriptor:
>   MACLEN (maximum of 127), retrieved from:
> 		skb_network_offset()
>   IPLEN  (maximum of 511), retrieved from:
> 		skb_checksum_start_offset() - skb_network_offset()
>   TUCMD.L4T indicates offset and if checksum or crc32c, based on:
> 		skb->csum_offset
> 
> The added advantage to doing this is that we can support inner checksum
> offloads for tunnels and MPLS while still being able to transparently insert
> VLAN tags.
> 
> I also took the opportunity to clean-up many of the feature flag configuration
> bits to make them a bit more consistent between drivers.
> 
> Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
> ---
>  drivers/net/ethernet/intel/ixgbe/ixgbe_main.c |  163 +++++++++-------------
> ---
>  1 file changed, 59 insertions(+), 104 deletions(-)

Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Ethtool shows generic checksum offload support, can be toggled.