-From 74b120c45aebf4278e1dedc55f5fa24d8ea83cdc Mon Sep 17 00:00:00 2001
-From: Eric Dumazet <edumazet@google.com>
-Date: Mon, 23 Jul 2018 09:28:21 -0700
-Subject: tcp: add tcp_ooo_try_coalesce() helper
-
-commit 58152ecbbcc6a0ce7fddd5bf5f6ee535834ece0c upstream.
-
-In case skb in out_or_order_queue is the result of
-multiple skbs coalescing, we would like to get a proper gso_segs
-counter tracking, so that future tcp_drop() can report an accurate
-number.
-
-I chose to not implement this tracking for skbs in receive queue,
-since they are not dropped, unless socket is disconnected.
-
-Signed-off-by: Eric Dumazet <edumazet@google.com>
-Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
-Acked-by: Yuchung Cheng <ycheng@google.com>
-Signed-off-by: David S. Miller <davem@davemloft.net>
-Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
-Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
----
- net/ipv4/tcp_input.c | 23 +++++++++++++++++++++--
- 1 file changed, 21 insertions(+), 2 deletions(-)
-
-diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
-index a9be8df108b4..9d0b73aa649f 100644
---- a/net/ipv4/tcp_input.c
-+++ b/net/ipv4/tcp_input.c
-@@ -4370,6 +4370,23 @@ static bool tcp_try_coalesce(struct sock *sk,
- return true;
- }
-
-+static bool tcp_ooo_try_coalesce(struct sock *sk,
-+ struct sk_buff *to,
-+ struct sk_buff *from,
-+ bool *fragstolen)
-+{
-+ bool res = tcp_try_coalesce(sk, to, from, fragstolen);
-+
-+ /* In case tcp_drop() is called later, update to->gso_segs */
-+ if (res) {
-+ u32 gso_segs = max_t(u16, 1, skb_shinfo(to)->gso_segs) +
-+ max_t(u16, 1, skb_shinfo(from)->gso_segs);
-+
-+ skb_shinfo(to)->gso_segs = min_t(u32, gso_segs, 0xFFFF);
-+ }
-+ return res;
-+}
-+
- static void tcp_drop(struct sock *sk, struct sk_buff *skb)
- {
- sk_drops_add(sk, skb);
-@@ -4493,7 +4510,8 @@ static void tcp_data_queue_ofo(struct sock *sk, struct sk_buff *skb)
- /* In the typical case, we are adding an skb to the end of the list.
- * Use of ooo_last_skb avoids the O(Log(N)) rbtree lookup.
- */
-- if (tcp_try_coalesce(sk, tp->ooo_last_skb, skb, &fragstolen)) {
-+ if (tcp_ooo_try_coalesce(sk, tp->ooo_last_skb,
-+ skb, &fragstolen)) {
- coalesce_done:
- tcp_grow_window(sk, skb);
- kfree_skb_partial(skb, fragstolen);
-@@ -4543,7 +4561,8 @@ coalesce_done:
- tcp_drop(sk, skb1);
- goto merge_right;
- }
-- } else if (tcp_try_coalesce(sk, skb1, skb, &fragstolen)) {
-+ } else if (tcp_ooo_try_coalesce(sk, skb1,
-+ skb, &fragstolen)) {
- goto coalesce_done;
- }
- p = &parent->rb_right;
---
-cgit 1.2-0.3.lf.el7
-
projects / openwrt / openwrt.git / commitdiff