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net/mlx4: Remove jumbo_remove step from TX path

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Now that the kernel doesn't insert HBH for BIG TCP IPv6 packets, remove
unnecessary steps from the mlx4 TX path, that used to check and remove
HBH.

Signed-off-by: Alice Mikityanska <alice@isovalent.com>
Acked-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260205133925.526371-7-alice.kernel@fastmail.im
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Alice Mikityanska 2026-02-05 15:39:19 +02:00 committed by Jakub Kicinski
parent bda5896e46
commit 94379a5880
1 changed files with 8 additions and 34 deletions
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42
drivers/net/ethernet/mellanox/mlx4/en_tx.c
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@ -636,28 +636,20 @@ static int get_real_size(const struct sk_buff *skb,
struct net_device *dev,
int *lso_header_size,
bool *inline_ok,
void **pfrag,
int *hopbyhop)
void **pfrag)
{
struct mlx4_en_priv *priv = netdev_priv(dev);
int real_size;
if (shinfo->gso_size) {
*inline_ok = false;
*hopbyhop = 0;
if (skb->encapsulation) {
*lso_header_size = skb_inner_tcp_all_headers(skb);
} 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_tcp_all_headers(skb);
}
real_size = CTRL_SIZE + shinfo->nr_frags * DS_SIZE +
ALIGN(*lso_header_size - *hopbyhop + 4, DS_SIZE);
ALIGN(*lso_header_size + 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 */
@ -884,7 +876,6 @@ 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;
@ -893,7 +884,6 @@ 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);
@ -903,7 +893,7 @@ 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, &hopbyhop);
&inline_ok, &fragptr);
if (unlikely(!real_size))
goto tx_drop_count;
@ -956,7 +946,7 @@ 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 - hopbyhop + 4, DS_SIZE);
int lso_align = ALIGN(lso_header_size + 4, DS_SIZE);
data = (void *)&tx_desc->lso + lso_align;
data_offset = offsetof(struct mlx4_en_tx_desc, lso) + lso_align;
@ -1021,31 +1011,15 @@ 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;