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Date: Wed, 9 Mar 2022 16:28:46 -0800
From: Eric Dumazet <eric.dumazet@...il.com>
To: "David S . Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>
Cc: netdev <netdev@...r.kernel.org>,
Alexander Duyck <alexanderduyck@...com>,
Coco Li <lixiaoyan@...gle.com>,
Eric Dumazet <edumazet@...gle.com>,
Eric Dumazet <eric.dumazet@...il.com>,
Tariq Toukan <tariqt@...dia.com>,
Saeed Mahameed <saeedm@...dia.com>,
Leon Romanovsky <leon@...nel.org>
Subject: [PATCH v3 net-next 14/14] mlx5: support BIG TCP packets
From: Coco Li <lixiaoyan@...gle.com>
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.
v2: clear hopbyhop in mlx5e_tx_get_gso_ihs()
Signed-off-by: Coco Li <lixiaoyan@...gle.com>
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Reviewed-by: Tariq Toukan <tariqt@...dia.com>
Cc: Saeed Mahameed <saeedm@...dia.com>
Cc: Leon Romanovsky <leon@...nel.org>
---
.../net/ethernet/mellanox/mlx5/core/en_main.c | 1 +
.../net/ethernet/mellanox/mlx5/core/en_tx.c | 82 +++++++++++++++----
2 files changed, 67 insertions(+), 16 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index b2ed2f6d4a9208aebfd17fd0c503cd1e37c39ee1..1e51ce1d74486392a26568852c5068fe9047296d 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -4910,6 +4910,7 @@ static void mlx5e_build_nic_netdev(struct net_device *netdev)
netdev->priv_flags |= IFF_UNICAST_FLT;
+ netif_set_tso_ipv6_max_size(netdev, 512 * 1024);
mlx5e_set_netdev_dev_addr(netdev);
mlx5e_ipsec_build_netdev(priv);
mlx5e_tls_build_netdev(priv);
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
index 2dc48406cd08d21ff94f665cd61ab9227f351215..c6f6ca2d216692e1d3fd99e540198b11145788cd 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
@@ -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)
{
@@ -130,23 +131,32 @@ 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 +218,7 @@ struct mlx5e_tx_attr {
__be16 mss;
u16 insz;
u8 opcode;
+ u8 hopbyhop;
};
struct mlx5e_tx_wqe_attr {
@@ -244,14 +255,16 @@ 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 +378,8 @@ 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;
@@ -379,15 +393,36 @@ 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 {
+ memcpy(start, skb->data, ETH_HLEN + sizeof(*h6));
+ 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);
- memcpy(eseg->inline_hdr.start, skb->data, attr->ihs);
+ memcpy(start, skb->data, ihs);
}
+ 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);
@@ -398,7 +433,7 @@ 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;
@@ -918,12 +953,27 @@ 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)) {
+ /* remove the HBH header.
+ * Layout: [Ethernet header][IPv6 header][HBH][TCP header]
+ */
+ memcpy(eseg->inline_hdr.start, skb->data, ETH_HLEN + sizeof(*h6));
+ h6 = (struct ipv6hdr *)((char *)eseg->inline_hdr.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 {
+ memcpy(eseg->inline_hdr.start, skb->data, attr.ihs);
+ }
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;
--
2.35.1.616.g0bdcbb4464-goog
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