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authorEric Dumazet <edumazet@google.com>2017-11-12 02:54:12 +0300
committerDavid S. Miller <davem@davemloft.net>2017-11-14 10:18:36 +0300
commit3a9b76fd0db9f0d426533f96a68a62a58753a51e (patch)
treea294317a5c3f2d9f3144d9d5bf9e58f9f3d61c8f /net
parent166c88189632b6b13612dc15e031f58d199602da (diff)
downloadlinux-3a9b76fd0db9f0d426533f96a68a62a58753a51e.tar.xz
tcp: allow drivers to tweak TSQ logic
I had many reports that TSQ logic breaks wifi aggregation. Current logic is to allow up to 1 ms of bytes to be queued into qdisc and drivers queues. But Wifi aggregation needs a bigger budget to allow bigger rates to be discovered by various TCP Congestion Controls algorithms. This patch adds an extra socket field, allowing wifi drivers to select another log scale to derive TCP Small Queue credit from current pacing rate. Initial value is 10, meaning that this patch does not change current behavior. We expect wifi drivers to set this field to smaller values (tests have been done with values from 6 to 9) They would have to use following template : if (skb->sk && skb->sk->sk_pacing_shift != MY_PACING_SHIFT) skb->sk->sk_pacing_shift = MY_PACING_SHIFT; Ref: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1670041 Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Johannes Berg <johannes.berg@intel.com> Cc: Toke Høiland-Jørgensen <toke@toke.dk> Cc: Kir Kolyshkin <kir@openvz.org> Acked-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/sock.c1
-rw-r--r--net/ipv4/tcp_output.c4
2 files changed, 3 insertions, 2 deletions
diff --git a/net/core/sock.c b/net/core/sock.c
index 57bbd6040eb6..13719af7b4e3 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -2746,6 +2746,7 @@ void sock_init_data(struct socket *sock, struct sock *sk)
sk->sk_max_pacing_rate = ~0U;
sk->sk_pacing_rate = ~0U;
+ sk->sk_pacing_shift = 10;
sk->sk_incoming_cpu = -1;
/*
* Before updating sk_refcnt, we must commit prior changes to memory
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 0256f7a41041..76dbe884f246 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -1720,7 +1720,7 @@ u32 tcp_tso_autosize(const struct sock *sk, unsigned int mss_now,
{
u32 bytes, segs;
- bytes = min(sk->sk_pacing_rate >> 10,
+ bytes = min(sk->sk_pacing_rate >> sk->sk_pacing_shift,
sk->sk_gso_max_size - 1 - MAX_TCP_HEADER);
/* Goal is to send at least one packet per ms,
@@ -2198,7 +2198,7 @@ static bool tcp_small_queue_check(struct sock *sk, const struct sk_buff *skb,
{
unsigned int limit;
- limit = max(2 * skb->truesize, sk->sk_pacing_rate >> 10);
+ limit = max(2 * skb->truesize, sk->sk_pacing_rate >> sk->sk_pacing_shift);
limit = min_t(u32, limit,
sock_net(sk)->ipv4.sysctl_tcp_limit_output_bytes);
limit <<= factor;