leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

tcp: factorize logic into tcp_epollin_ready()

Browse Source 
Both tcp_data_ready() and tcp_stream_is_readable() share the same logic.

Add tcp_epollin_ready() helper to avoid duplication.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Arjun Roy <arjunroy@google.com>
Cc: Wei Wang <weiwan@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2021-02-12 15:22:14 -08:00
committed by David S. Miller
parent f969dc5a88
commit 05dc72aba3
3 changed files with 18 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
include/net/tcp.h
View File

@@ -1442,6 +1442,18 @@ static inline bool tcp_rmem_pressure(const struct sock *sk)
return atomic_read(&sk->sk_rmem_alloc) > threshold;
}
static inline bool tcp_epollin_ready(const struct sock *sk, int target)
{
const struct tcp_sock *tp = tcp_sk(sk);
int avail = READ_ONCE(tp->rcv_nxt) - READ_ONCE(tp->copied_seq);
if (avail <= 0)
return false;
return (avail >= target) || tcp_rmem_pressure(sk) ||
(tcp_receive_window(tp) <= inet_csk(sk)->icsk_ack.rcv_mss);
}
extern void tcp_openreq_init_rwin(struct request_sock *req,
const struct sock *sk_listener,
const struct dst_entry *dst);