From: Eric Dumazet <eric.dumazet@gmail.com>
To: "David S . Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>
Cc: netdev <netdev@vger.kernel.org>,
Eric Dumazet <edumazet@google.com>,
Coco Li <lixiaoyan@google.com>,
Eric Dumazet <eric.dumazet@gmail.com>,
Tariq Toukan <tariqt@nvidia.com>
Subject: [PATCH net-next 14/15] mlx4: support BIG TCP packets
Date: Wed, 2 Feb 2022 17:51:39 -0800 [thread overview]
Message-ID: <20220203015140.3022854-15-eric.dumazet@gmail.com> (raw)
In-Reply-To: <20220203015140.3022854-1-eric.dumazet@gmail.com>
From: Eric Dumazet <edumazet@google.com>
mlx4 supports LSOv2 just fine.
IPv6 stack inserts a temporary Hop-by-Hop header
with JUMBO TLV for big packets.
We need to ignore the HBH header when populating TX descriptor.
Tested:
Before: (not enabling bigger TSO/GRO packets)
ip link set dev eth0 gso_ipv6_max_size 65536 gro_ipv6_max_size 65536
netperf -H lpaa18 -t TCP_RR -T2,2 -l 10 -Cc -- -r 70000,70000
MIGRATED TCP REQUEST/RESPONSE TEST from ::0 (::) port 0 AF_INET6 to lpaa18.prod.google.com () port 0 AF_INET6 : first burst 0 : cpu bind
Local /Remote
Socket Size Request Resp. Elapsed Trans. CPU CPU S.dem S.dem
Send Recv Size Size Time Rate local remote local remote
bytes bytes bytes bytes secs. per sec % S % S us/Tr us/Tr
262144 540000 70000 70000 10.00 6591.45 0.86 1.34 62.490 97.446
262144 540000
After: (enabling bigger TSO/GRO packets)
ip link set dev eth0 gso_ipv6_max_size 185000 gro_ipv6_max_size 185000
netperf -H lpaa18 -t TCP_RR -T2,2 -l 10 -Cc -- -r 70000,70000
MIGRATED TCP REQUEST/RESPONSE TEST from ::0 (::) port 0 AF_INET6 to lpaa18.prod.google.com () port 0 AF_INET6 : first burst 0 : cpu bind
Local /Remote
Socket Size Request Resp. Elapsed Trans. CPU CPU S.dem S.dem
Send Recv Size Size Time Rate local remote local remote
bytes bytes bytes bytes secs. per sec % S % S us/Tr us/Tr
262144 540000 70000 70000 10.00 8383.95 0.95 1.01 54.432 57.584
262144 540000
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Tariq Toukan <tariqt@nvidia.com>
---
.../net/ethernet/mellanox/mlx4/en_netdev.c | 3 ++
drivers/net/ethernet/mellanox/mlx4/en_tx.c | 47 +++++++++++++++----
2 files changed, 41 insertions(+), 9 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
index c61dc7ae0c056a4dbcf24297549f6b1b5cc25d92..76cb93f5e5240c54f6f4c57e39739376206b4f34 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
@@ -3417,6 +3417,9 @@ int mlx4_en_init_netdev(struct mlx4_en_dev *mdev, int port,
dev->min_mtu = ETH_MIN_MTU;
dev->max_mtu = priv->max_mtu;
+ /* supports LSOv2 packets, 512KB limit has been tested. */
+ netif_set_tso_ipv6_max_size(dev, 512 * 1024);
+
mdev->pndev[port] = dev;
mdev->upper[port] = NULL;
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_tx.c b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
index 817f4154b86d599cd593876ec83529051d95fe2f..c89b3e8094e7d8cfb11aaa6cc4ad63bf3ad5934e 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
@@ -44,6 +44,7 @@
#include <linux/ipv6.h>
#include <linux/moduleparam.h>
#include <linux/indirect_call_wrapper.h>
+#include <net/ipv6.h>
#include "mlx4_en.h"
@@ -635,19 +636,28 @@ static int get_real_size(const struct sk_buff *skb,
struct net_device *dev,
int *lso_header_size,
bool *inline_ok,
- void **pfrag)
+ void **pfrag,
+ int *hopbyhop)
{
struct mlx4_en_priv *priv = netdev_priv(dev);
int real_size;
if (shinfo->gso_size) {
*inline_ok = false;
- if (skb->encapsulation)
+ *hopbyhop = 0;
+ if (skb->encapsulation) {
*lso_header_size = (skb_inner_transport_header(skb) - skb->data) + inner_tcp_hdrlen(skb);
- else
+ } else {
+ /* Detects large IPV6 TCP packets and prepares for removal of
+ * HBH header that has been pushed by ip6_xmit(),
+ * mainly so that tcpdump can dissect them.
+ */
+ if (ipv6_has_hopopt_jumbo(skb))
+ *hopbyhop = sizeof(struct hop_jumbo_hdr);
*lso_header_size = skb_transport_offset(skb) + tcp_hdrlen(skb);
+ }
real_size = CTRL_SIZE + shinfo->nr_frags * DS_SIZE +
- ALIGN(*lso_header_size + 4, DS_SIZE);
+ ALIGN(*lso_header_size - *hopbyhop + 4, DS_SIZE);
if (unlikely(*lso_header_size != skb_headlen(skb))) {
/* We add a segment for the skb linear buffer only if
* it contains data */
@@ -874,6 +884,7 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
int desc_size;
int real_size;
u32 index, bf_index;
+ struct ipv6hdr *h6;
__be32 op_own;
int lso_header_size;
void *fragptr = NULL;
@@ -882,6 +893,7 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
bool stop_queue;
bool inline_ok;
u8 data_offset;
+ int hopbyhop;
bool bf_ok;
tx_ind = skb_get_queue_mapping(skb);
@@ -891,7 +903,7 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
goto tx_drop;
real_size = get_real_size(skb, shinfo, dev, &lso_header_size,
- &inline_ok, &fragptr);
+ &inline_ok, &fragptr, &hopbyhop);
if (unlikely(!real_size))
goto tx_drop_count;
@@ -944,7 +956,7 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
data = &tx_desc->data;
data_offset = offsetof(struct mlx4_en_tx_desc, data);
} else {
- int lso_align = ALIGN(lso_header_size + 4, DS_SIZE);
+ int lso_align = ALIGN(lso_header_size - hopbyhop + 4, DS_SIZE);
data = (void *)&tx_desc->lso + lso_align;
data_offset = offsetof(struct mlx4_en_tx_desc, lso) + lso_align;
@@ -1009,14 +1021,31 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
((ring->prod & ring->size) ?
cpu_to_be32(MLX4_EN_BIT_DESC_OWN) : 0);
+ lso_header_size -= hopbyhop;
/* Fill in the LSO prefix */
tx_desc->lso.mss_hdr_size = cpu_to_be32(
shinfo->gso_size << 16 | lso_header_size);
- /* Copy headers;
- * note that we already verified that it is linear */
- memcpy(tx_desc->lso.header, skb->data, lso_header_size);
+ if (unlikely(hopbyhop)) {
+ /* remove the HBH header.
+ * Layout: [Ethernet header][IPv6 header][HBH][TCP header]
+ */
+ memcpy(tx_desc->lso.header, skb->data, ETH_HLEN + sizeof(*h6));
+ h6 = (struct ipv6hdr *)((char *)tx_desc->lso.header + ETH_HLEN);
+ h6->nexthdr = IPPROTO_TCP;
+ /* Copy the TCP header after the IPv6 one */
+ memcpy(h6 + 1,
+ skb->data + ETH_HLEN + sizeof(*h6) +
+ sizeof(struct hop_jumbo_hdr),
+ tcp_hdrlen(skb));
+ /* Leave ipv6 payload_len set to 0, as LSO v2 specs request. */
+ } else {
+ /* Copy headers;
+ * note that we already verified that it is linear
+ */
+ memcpy(tx_desc->lso.header, skb->data, lso_header_size);
+ }
ring->tso_packets++;
i = shinfo->gso_segs;
--
2.35.0.rc2.247.g8bbb082509-goog
next prev parent reply other threads:[~2022-02-03 1:52 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-03 1:51 [PATCH net-next 00/15] tcp: BIG TCP implementation Eric Dumazet
2022-02-03 1:51 ` [PATCH net-next 01/15] net: add netdev->tso_ipv6_max_size attribute Eric Dumazet
2022-02-03 16:34 ` Jakub Kicinski
2022-02-03 16:56 ` Eric Dumazet
2022-02-03 18:58 ` Jakub Kicinski
2022-02-03 19:12 ` Eric Dumazet
2022-02-03 1:51 ` [PATCH net-next 02/15] ipv6: add dev->gso_ipv6_max_size Eric Dumazet
2022-02-03 8:57 ` Paolo Abeni
2022-02-03 15:34 ` Eric Dumazet
2022-02-03 1:51 ` [PATCH net-next 03/15] tcp_cubic: make hystart_ack_delay() aware of BIG TCP Eric Dumazet
2022-02-03 1:51 ` [PATCH net-next 04/15] ipv6: add struct hop_jumbo_hdr definition Eric Dumazet
2022-02-03 1:51 ` [PATCH net-next 05/15] ipv6/gso: remove temporary HBH/jumbo header Eric Dumazet
2022-02-03 18:53 ` Alexander H Duyck
2022-02-03 19:17 ` Eric Dumazet
2022-02-03 19:45 ` Alexander Duyck
2022-02-03 19:59 ` Eric Dumazet
2022-02-03 21:08 ` Alexander H Duyck
2022-02-03 21:41 ` Eric Dumazet
2022-02-04 0:05 ` Alexander Duyck
2022-02-04 0:27 ` Eric Dumazet
2022-02-04 1:14 ` Eric Dumazet
2022-02-04 1:48 ` Eric Dumazet
2022-02-04 2:15 ` Eric Dumazet
2022-02-03 1:51 ` [PATCH net-next 06/15] ipv6/gro: insert " Eric Dumazet
2022-02-03 9:19 ` Paolo Abeni
2022-02-03 15:48 ` Eric Dumazet
2022-02-03 1:51 ` [PATCH net-next 07/15] ipv6: add GRO_IPV6_MAX_SIZE Eric Dumazet
2022-02-03 2:18 ` Eric Dumazet
2022-02-03 10:44 ` Paolo Abeni
2022-02-03 1:51 ` [PATCH net-next 08/15] ipv6: Add hop-by-hop header to jumbograms in ip6_output Eric Dumazet
2022-02-03 9:07 ` Paolo Abeni
2022-02-03 16:31 ` Eric Dumazet
2022-02-03 1:51 ` [PATCH net-next 09/15] net: increase MAX_SKB_FRAGS Eric Dumazet
2022-02-03 5:02 ` kernel test robot
2022-02-03 5:20 ` Eric Dumazet
2022-02-03 5:31 ` Jakub Kicinski
2022-02-03 6:35 ` Eric Dumazet
2022-02-03 5:23 ` kernel test robot
2022-02-03 5:43 ` kernel test robot
2022-02-03 16:01 ` Paolo Abeni
2022-02-03 17:26 ` Alexander H Duyck
2022-02-03 17:34 ` Eric Dumazet
2022-02-03 17:56 ` Alexander Duyck
2022-02-03 19:18 ` Jakub Kicinski
2022-02-03 19:20 ` Eric Dumazet
2022-02-03 19:54 ` Eric Dumazet
2022-02-04 10:18 ` David Laight
2022-02-04 15:46 ` Alexander Duyck
2022-02-03 1:51 ` [PATCH net-next 10/15] net: loopback: enable BIG TCP packets Eric Dumazet
2022-02-03 1:51 ` [PATCH net-next 11/15] bonding: update dev->tso_ipv6_max_size Eric Dumazet
2022-02-03 1:51 ` [PATCH net-next 12/15] macvlan: enable BIG TCP Packets Eric Dumazet
2022-02-03 1:51 ` [PATCH net-next 13/15] ipvlan: " Eric Dumazet
2022-02-03 1:51 ` Eric Dumazet [this message]
2022-02-03 13:04 ` [PATCH net-next 14/15] mlx4: support BIG TCP packets Tariq Toukan
2022-02-03 15:54 ` Eric Dumazet
2022-02-03 1:51 ` [PATCH net-next 15/15] mlx5: " Eric Dumazet
2022-02-03 7:27 ` Tariq Toukan
2022-02-04 4:03 ` kernel test robot
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