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authorEric Dumazet <edumazet@google.com>2017-12-12 06:34:19 -0800
committerDavid S. Miller <davem@davemloft.net>2017-12-13 15:10:57 -0500
commitc9f1f58dc2eba550f208809d272bf0b14f41edba (patch)
tree4c494f3f92e9a221d159f298800e5a88437c7fad /include/net/sock.h
parenteb7935830d00b9e0c4ca11382143ea2320eb45c2 (diff)
downloadlinux-c9f1f58dc2eba550f208809d272bf0b14f41edba.tar.bz2
net: sk_pacing_shift_update() helper
In commit 3a9b76fd0db9 ("tcp: allow drivers to tweak TSQ logic") I gave a code sample to set sk->sk_pacing_shift that was not complete. Better add a helper that can be used by drivers without worries, and maybe amended in the future. A wifi driver might use it from its ndo_start_xmit() Following call would setup TCP to allow up to ~8ms of queued data per flow. sk_pacing_shift_update(skb->sk, 7); Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/sock.h')
-rw-r--r--include/net/sock.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/net/sock.h b/include/net/sock.h
index 9155da422692..9a9047268d37 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -2407,4 +2407,15 @@ static inline int sk_get_rmem0(const struct sock *sk, const struct proto *proto)
return *proto->sysctl_rmem;
}
+/* Default TCP Small queue budget is ~1 ms of data (1sec >> 10)
+ * Some wifi drivers need to tweak it to get more chunks.
+ * They can use this helper from their ndo_start_xmit()
+ */
+static inline void sk_pacing_shift_update(struct sock *sk, int val)
+{
+ if (!sk || !sk_fullsock(sk) || sk->sk_pacing_shift == val)
+ return;
+ sk->sk_pacing_shift = val;
+}
+
#endif /* _SOCK_H */