diff options
| author | Eric Dumazet <edumazet@google.com> | 2026-04-16 20:03:07 +0000 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2026-04-18 11:10:12 -0700 |
| commit | 21e92a38cfd891538598ba8f805e0165a820d532 (patch) | |
| tree | 27511c2b82c9278f5791eb89282a4c45a2dbc97a /net | |
| parent | 267bf3cf9a6f0ffb98b8afd983c1950e835f07c9 (diff) | |
tcp: add data-race annotations around tp->data_segs_out and tp->total_retrans
tcp_get_timestamping_opt_stats() intentionally runs lockless, we must
add READ_ONCE() and WRITE_ONCE() annotations to keep KCSAN happy.
Fixes: 7e98102f4897 ("tcp: record pkts sent and retransmistted")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260416200319.3608680-3-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/tcp.c | 4 | ||||
| -rw-r--r-- | net/ipv4/tcp_output.c | 8 |
2 files changed, 7 insertions, 5 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 7b7812cb710f..e39e0734d958 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -4434,9 +4434,9 @@ struct sk_buff *tcp_get_timestamping_opt_stats(const struct sock *sk, nla_put_u64_64bit(stats, TCP_NLA_SNDBUF_LIMITED, info.tcpi_sndbuf_limited, TCP_NLA_PAD); nla_put_u64_64bit(stats, TCP_NLA_DATA_SEGS_OUT, - tp->data_segs_out, TCP_NLA_PAD); + READ_ONCE(tp->data_segs_out), TCP_NLA_PAD); nla_put_u64_64bit(stats, TCP_NLA_TOTAL_RETRANS, - tp->total_retrans, TCP_NLA_PAD); + READ_ONCE(tp->total_retrans), TCP_NLA_PAD); rate = READ_ONCE(sk->sk_pacing_rate); rate64 = (rate != ~0UL) ? rate : ~0ULL; diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 8e99687526a6..d8e8bba2d03a 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -1688,7 +1688,8 @@ static int __tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, if (skb->len != tcp_header_size) { tcp_event_data_sent(tp, sk); - tp->data_segs_out += tcp_skb_pcount(skb); + WRITE_ONCE(tp->data_segs_out, + tp->data_segs_out + tcp_skb_pcount(skb)); tp->bytes_sent += skb->len - tcp_header_size; } @@ -3642,7 +3643,7 @@ start: TCP_ADD_STATS(sock_net(sk), TCP_MIB_RETRANSSEGS, segs); if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_SYN) __NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPSYNRETRANS); - tp->total_retrans += segs; + WRITE_ONCE(tp->total_retrans, tp->total_retrans + segs); tp->bytes_retrans += skb->len; /* make sure skb->data is aligned on arches that require it @@ -4646,7 +4647,8 @@ int tcp_rtx_synack(const struct sock *sk, struct request_sock *req) * However in this case, we are dealing with a passive fastopen * socket thus we can change total_retrans value. */ - tcp_sk_rw(sk)->total_retrans++; + WRITE_ONCE(tcp_sk_rw(sk)->total_retrans, + tcp_sk_rw(sk)->total_retrans + 1); } trace_tcp_retransmit_synack(sk, req); WRITE_ONCE(req->num_retrans, req->num_retrans + 1); |