[PATCH net] net: bpf: Use the protocol's set_rcvlowat behavior if there is one

[PATCH net] net: bpf: Use the protocol's set_rcvlowat behavior if there is one

[gfree.wind]

From: Gao Feng <gfree.wind@gmail.com>

The commit d1361840f8c5 ("tcp: fix SO_RCVLOWAT and RCVBUF autotuning")
add one new (struct proto_ops)->set_rcvlowat method so that a protocol
can override the default setsockopt(SO_RCVLOWAT) behavior.

The prior bpf codes don't check and invoke the protos's set_rcvlowat,
now correct it.

Signed-off-by: Gao Feng <gfree.wind@gmail.com>
---
 net/core/filter.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/core/filter.c b/net/core/filter.c
index 7950f7520765..beb6209897ab 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -5064,7 +5064,10 @@ static int _bpf_setsockopt(struct sock *sk, int level, int optname,
 		case SO_RCVLOWAT:
 			if (val < 0)
 				val = INT_MAX;
-			WRITE_ONCE(sk->sk_rcvlowat, val ? : 1);
+			if (sk->sk_socket && sk->sk_socket->ops->set_rcvlowat)
+				ret = sk->sk_socket->ops->set_rcvlowat(sk, val);
+			else
+				WRITE_ONCE(sk->sk_rcvlowat, val ? : 1);
 			break;
 		case SO_MARK:
 			if (sk->sk_mark != val) {
-- 
2.25.1

Re: [PATCH net] net: bpf: Use the protocol's set_rcvlowat behavior if there is one

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (master)
by David S. Miller <davem@davemloft.net>:

On Thu,  4 Aug 2022 23:04:21 +0800 you wrote:
> From: Gao Feng <gfree.wind@gmail.com>
> 
> The commit d1361840f8c5 ("tcp: fix SO_RCVLOWAT and RCVBUF autotuning")
> add one new (struct proto_ops)->set_rcvlowat method so that a protocol
> can override the default setsockopt(SO_RCVLOWAT) behavior.
> 
> The prior bpf codes don't check and invoke the protos's set_rcvlowat,
> now correct it.
> 
> [...]

Here is the summary with links:
  - [net] net: bpf: Use the protocol's set_rcvlowat behavior if there is one
    https://git.kernel.org/netdev/net/c/f574f7f839fc

You are awesome, thank you!
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