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mlx5: support BIG TCP packets

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mlx5 supports LSOv2.

IPv6 gro/tcp stacks insert a temporary Hop-by-Hop header
with JUMBO TLV for big packets.

We need to ignore/skip this HBH header when populating TX descriptor.

Note that ipv6_has_hopopt_jumbo() only recognizes very specific packet
layout, thus mlx5e_sq_xmit_wqe() is taking care of this layout only.

v7: adopt unsafe_memcpy() and MLX5_UNSAFE_MEMCPY_DISCLAIMER
v2: clear hopbyhop in mlx5e_tx_get_gso_ihs()
v4: fix compile error for CONFIG_MLX5_CORE_IPOIB=y

Signed-off-by: Coco Li <lixiaoyan@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Cc: Saeed Mahameed <saeedm@nvidia.com>
Cc: Leon Romanovsky <leon@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2022-05-13 11:34:08 -07:00 committed by David S. Miller
parent 1169a64265
commit de78960e02
2 changed files with 89 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/net/ethernet/mellanox/mlx5/core/en_main.c
View File

@ -4920,6 +4920,7 @@ static void mlx5e_build_nic_netdev(struct net_device *netdev)
netdev->priv_flags |= IFF_UNICAST_FLT;
netif_set_tso_max_size(netdev, GSO_MAX_SIZE);
mlx5e_set_netdev_dev_addr(netdev);
mlx5e_ipsec_build_netdev(priv);
mlx5e_ktls_build_netdev(priv);

111
drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
View File

@ -40,6 +40,7 @@
#include "en_accel/en_accel.h"
#include "en_accel/ipsec_rxtx.h"
#include "en/ptp.h"
#include <net/ipv6.h>
static void mlx5e_dma_unmap_wqe_err(struct mlx5e_txqsq *sq, u8 num_dma)
{
@ -91,6 +92,13 @@ static inline u16 mlx5e_calc_min_inline(enum mlx5_inline_modes mode,
return min_t(u16, hlen, skb_headlen(skb));
}
#define MLX5_UNSAFE_MEMCPY_DISCLAIMER \
"This copy has been bounds-checked earlier in " \
"mlx5i_sq_calc_wqe_attr() and intentionally " \
"crosses a flex array boundary. Since it is " \
"performance sensitive, splitting the copy is " \
"undesirable."
static inline void mlx5e_insert_vlan(void *start, struct sk_buff *skb, u16 ihs)
{
struct vlan_ethhdr *vhdr = (struct vlan_ethhdr *)start;
@ -100,7 +108,10 @@ static inline void mlx5e_insert_vlan(void *start, struct sk_buff *skb, u16 ihs)
memcpy(&vhdr->addrs, skb->data, cpy1_sz);
vhdr->h_vlan_proto = skb->vlan_proto;
vhdr->h_vlan_TCI = cpu_to_be16(skb_vlan_tag_get(skb));
memcpy(&vhdr->h_vlan_encapsulated_proto, skb->data + cpy1_sz, cpy2_sz);
unsafe_memcpy(&vhdr->h_vlan_encapsulated_proto,
skb->data + cpy1_sz,
cpy2_sz,
MLX5_UNSAFE_MEMCPY_DISCLAIMER);
}
static inline void
@ -130,23 +141,32 @@ mlx5e_txwqe_build_eseg_csum(struct mlx5e_txqsq *sq, struct sk_buff *skb,
sq->stats->csum_none++;
}
/* Returns the number of header bytes that we plan
* to inline later in the transmit descriptor
*/
static inline u16
mlx5e_tx_get_gso_ihs(struct mlx5e_txqsq *sq, struct sk_buff *skb)
mlx5e_tx_get_gso_ihs(struct mlx5e_txqsq *sq, struct sk_buff *skb, int *hopbyhop)
{
struct mlx5e_sq_stats *stats = sq->stats;
u16 ihs;
*hopbyhop = 0;
if (skb->encapsulation) {
ihs = skb_inner_transport_offset(skb) + inner_tcp_hdrlen(skb);
stats->tso_inner_packets++;
stats->tso_inner_bytes += skb->len - ihs;
} else {
if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4)
if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) {
ihs = skb_transport_offset(skb) + sizeof(struct udphdr);
else
} else {
ihs = skb_transport_offset(skb) + tcp_hdrlen(skb);
if (ipv6_has_hopopt_jumbo(skb)) {
*hopbyhop = sizeof(struct hop_jumbo_hdr);
ihs -= sizeof(struct hop_jumbo_hdr);
}
}
stats->tso_packets++;
stats->tso_bytes += skb->len - ihs;
stats->tso_bytes += skb->len - ihs - *hopbyhop;
}
return ihs;
@ -208,6 +228,7 @@ struct mlx5e_tx_attr {
__be16 mss;
u16 insz;
u8 opcode;
u8 hopbyhop;
};
struct mlx5e_tx_wqe_attr {
@ -244,14 +265,16 @@ static void mlx5e_sq_xmit_prepare(struct mlx5e_txqsq *sq, struct sk_buff *skb,
struct mlx5e_sq_stats *stats = sq->stats;
if (skb_is_gso(skb)) {
u16 ihs = mlx5e_tx_get_gso_ihs(sq, skb);
int hopbyhop;
u16 ihs = mlx5e_tx_get_gso_ihs(sq, skb, &hopbyhop);
*attr = (struct mlx5e_tx_attr) {
.opcode = MLX5_OPCODE_LSO,
.mss = cpu_to_be16(skb_shinfo(skb)->gso_size),
.ihs = ihs,
.num_bytes = skb->len + (skb_shinfo(skb)->gso_segs - 1) * ihs,
.headlen = skb_headlen(skb) - ihs,
.headlen = skb_headlen(skb) - ihs - hopbyhop,
.hopbyhop = hopbyhop,
};
stats->packets += skb_shinfo(skb)->gso_segs;
@ -365,7 +388,8 @@ mlx5e_sq_xmit_wqe(struct mlx5e_txqsq *sq, struct sk_buff *skb,
struct mlx5_wqe_eth_seg *eseg;
struct mlx5_wqe_data_seg *dseg;
struct mlx5e_tx_wqe_info *wi;
u16 ihs = attr->ihs;
struct ipv6hdr *h6;
struct mlx5e_sq_stats *stats = sq->stats;
int num_dma;
@ -379,21 +403,40 @@ mlx5e_sq_xmit_wqe(struct mlx5e_txqsq *sq, struct sk_buff *skb,
eseg->mss = attr->mss;
if (attr->ihs) {
if (skb_vlan_tag_present(skb)) {
eseg->inline_hdr.sz |= cpu_to_be16(attr->ihs + VLAN_HLEN);
mlx5e_insert_vlan(eseg->inline_hdr.start, skb, attr->ihs);
if (ihs) {
u8 *start = eseg->inline_hdr.start;
if (unlikely(attr->hopbyhop)) {
/* remove the HBH header.
* Layout: [Ethernet header][IPv6 header][HBH][TCP header]
*/
if (skb_vlan_tag_present(skb)) {
mlx5e_insert_vlan(start, skb, ETH_HLEN + sizeof(*h6));
ihs += VLAN_HLEN;
h6 = (struct ipv6hdr *)(start + sizeof(struct vlan_ethhdr));
} else {
unsafe_memcpy(start, skb->data,
ETH_HLEN + sizeof(*h6),
MLX5_UNSAFE_MEMCPY_DISCLAIMER);
h6 = (struct ipv6hdr *)(start + 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 if (skb_vlan_tag_present(skb)) {
mlx5e_insert_vlan(start, skb, ihs);
ihs += VLAN_HLEN;
stats->added_vlan_packets++;
} else {
eseg->inline_hdr.sz |= cpu_to_be16(attr->ihs);
unsafe_memcpy(eseg->inline_hdr.start, skb->data, attr->ihs,
/* This copy has been bounds-checked earlier in
* mlx5i_sq_calc_wqe_attr() and intentionally
* crosses a flex array boundary. Since it is
* performance sensitive, splitting the copy is
* undesirable.
*/);
unsafe_memcpy(eseg->inline_hdr.start, skb->data,
attr->ihs,
MLX5_UNSAFE_MEMCPY_DISCLAIMER);
}
eseg->inline_hdr.sz |= cpu_to_be16(ihs);
dseg += wqe_attr->ds_cnt_inl;
} else if (skb_vlan_tag_present(skb)) {
eseg->insert.type = cpu_to_be16(MLX5_ETH_WQE_INSERT_VLAN);
@ -404,7 +447,7 @@ mlx5e_sq_xmit_wqe(struct mlx5e_txqsq *sq, struct sk_buff *skb,
}
dseg += wqe_attr->ds_cnt_ids;
num_dma = mlx5e_txwqe_build_dsegs(sq, skb, skb->data + attr->ihs,
num_dma = mlx5e_txwqe_build_dsegs(sq, skb, skb->data + attr->ihs + attr->hopbyhop,
attr->headlen, dseg);
if (unlikely(num_dma < 0))
goto err_drop;
@ -924,12 +967,34 @@ void mlx5i_sq_xmit(struct mlx5e_txqsq *sq, struct sk_buff *skb,
eseg->mss = attr.mss;
if (attr.ihs) {
memcpy(eseg->inline_hdr.start, skb->data, attr.ihs);
if (unlikely(attr.hopbyhop)) {
struct ipv6hdr *h6;
/* remove the HBH header.
* Layout: [Ethernet header][IPv6 header][HBH][TCP header]
*/
unsafe_memcpy(eseg->inline_hdr.start, skb->data,
ETH_HLEN + sizeof(*h6),
MLX5_UNSAFE_MEMCPY_DISCLAIMER);
h6 = (struct ipv6hdr *)((char *)eseg->inline_hdr.start + ETH_HLEN);
h6->nexthdr = IPPROTO_TCP;
/* Copy the TCP header after the IPv6 one */
unsafe_memcpy(h6 + 1,
skb->data + ETH_HLEN + sizeof(*h6) +
sizeof(struct hop_jumbo_hdr),
tcp_hdrlen(skb),
MLX5_UNSAFE_MEMCPY_DISCLAIMER);
/* Leave ipv6 payload_len set to 0, as LSO v2 specs request. */
} else {
unsafe_memcpy(eseg->inline_hdr.start, skb->data,
attr.ihs,
MLX5_UNSAFE_MEMCPY_DISCLAIMER);
}
eseg->inline_hdr.sz = cpu_to_be16(attr.ihs);
dseg += wqe_attr.ds_cnt_inl;
}
num_dma = mlx5e_txwqe_build_dsegs(sq, skb, skb->data + attr.ihs,
num_dma = mlx5e_txwqe_build_dsegs(sq, skb, skb->data + attr.ihs + attr.hopbyhop,
attr.headlen, dseg);
if (unlikely(num_dma < 0))
goto err_drop;