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net: tcp: Add noinline_for_tracing annotation for tcp_drop_reason()

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We previously hooked the tcp_drop_reason() function using BPF to monitor
TCP drop reasons. However, after upgrading our compiler from GCC 9 to GCC
11, tcp_drop_reason() is now inlined, preventing us from hooking into it.
To address this, it would be beneficial to make noinline explicitly for
tracing.

Link: https://lore.kernel.org/netdev/CANn89iJuShCmidCi_ZkYABtmscwbVjhuDta1MS5LxV_4H9tKOA@mail.gmail.com/
Suggested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Cc: Menglong Dong <menglong8.dong@gmail.com>
Link: https://patch.msgid.link/20241024093742.87681-3-laoar.shao@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Yafang Shao 2024-10-24 17:37:42 +08:00 committed by Jakub Kicinski
parent a8f80673ca
commit dbd5e2e79e
1 changed files with 2 additions and 2 deletions
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4
net/ipv4/tcp_input.c
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@ -4921,8 +4921,8 @@ static bool tcp_ooo_try_coalesce(struct sock *sk,
return res;
}
static void tcp_drop_reason(struct sock *sk, struct sk_buff *skb,
enum skb_drop_reason reason)
noinline_for_tracing static void
tcp_drop_reason(struct sock *sk, struct sk_buff *skb, enum skb_drop_reason reason)
{
sk_drops_add(sk, skb);
sk_skb_reason_drop(sk, skb, reason);