diff options
| author | Eric Dumazet <edumazet@google.com> | 2023-06-09 22:42:44 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-06-12 12:38:54 +0200 |
| commit | fbf934068f6b93a8c4ddda293fc02b4eb3747323 (patch) | |
| tree | 8fb243da4c08b49f63f920471d3c826a2fe1ebca /net/ipv4 | |
| parent | Merge branch 'ethtool-extack' (diff) | |
| download | linux-fbf934068f6b93a8c4ddda293fc02b4eb3747323.tar.xz linux-fbf934068f6b93a8c4ddda293fc02b4eb3747323.zip | |
tcp: let tcp_send_syn_data() build headless packets
tcp_send_syn_data() is the last component in TCP transmit
path to put payload in skb->head.
Switch it to use page frags, so that we can remove dead
code later.
This allows to put more payload than previous implementation.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/tcp.c | 2 | ||||
| -rw-r--r-- | net/ipv4/tcp_output.c | 31 |
2 files changed, 20 insertions, 13 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 09f03221a6f1..da7f156d9fad 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -957,7 +957,7 @@ static int tcp_downgrade_zcopy_pure(struct sock *sk, struct sk_buff *skb) } -static int tcp_wmem_schedule(struct sock *sk, int copy) +int tcp_wmem_schedule(struct sock *sk, int copy) { int left; diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index f8ce77ce7c3e..d03966337359 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -3802,8 +3802,9 @@ static int tcp_send_syn_data(struct sock *sk, struct sk_buff *syn) struct inet_connection_sock *icsk = inet_csk(sk); struct tcp_sock *tp = tcp_sk(sk); struct tcp_fastopen_request *fo = tp->fastopen_req; - int space, err = 0; + struct page_frag *pfrag = sk_page_frag(sk); struct sk_buff *syn_data; + int space, err = 0; tp->rx_opt.mss_clamp = tp->advmss; /* If MSS is not cached */ if (!tcp_fastopen_cookie_check(sk, &tp->rx_opt.mss_clamp, &fo->cookie)) @@ -3822,25 +3823,31 @@ static int tcp_send_syn_data(struct sock *sk, struct sk_buff *syn) space = min_t(size_t, space, fo->size); - /* limit to order-0 allocations */ - space = min_t(size_t, space, SKB_MAX_HEAD(MAX_TCP_HEADER)); - - syn_data = tcp_stream_alloc_skb(sk, space, sk->sk_allocation, false); + if (space && + !skb_page_frag_refill(min_t(size_t, space, PAGE_SIZE), + pfrag, sk->sk_allocation)) + goto fallback; + syn_data = tcp_stream_alloc_skb(sk, 0, sk->sk_allocation, false); if (!syn_data) goto fallback; memcpy(syn_data->cb, syn->cb, sizeof(syn->cb)); if (space) { - int copied = copy_from_iter(skb_put(syn_data, space), space, - &fo->data->msg_iter); - if (unlikely(!copied)) { + space = min_t(size_t, space, pfrag->size - pfrag->offset); + space = tcp_wmem_schedule(sk, space); + } + if (space) { + space = copy_page_from_iter(pfrag->page, pfrag->offset, + space, &fo->data->msg_iter); + if (unlikely(!space)) { tcp_skb_tsorted_anchor_cleanup(syn_data); kfree_skb(syn_data); goto fallback; } - if (copied != space) { - skb_trim(syn_data, copied); - space = copied; - } + skb_fill_page_desc(syn_data, 0, pfrag->page, + pfrag->offset, space); + page_ref_inc(pfrag->page); + pfrag->offset += space; + skb_len_add(syn_data, space); skb_zcopy_set(syn_data, fo->uarg, NULL); } /* No more data pending in inet_wait_for_connect() */ |