diff options
| author | Peilin Ye | 2022-09-22 21:59:13 -0700 |
|---|---|---|
| committer | Jakub Kicinski | 2022-09-26 11:00:19 -0700 |
| commit | 31f1fbcb346c9342f6860c322b3f33b2acbc640b (patch) | |
| tree | a41df2706cf3b9ca01888b07d6b9fd63ba8f6944 /net/ipv4/udp.c | |
| parent | c52add61c27ea23501be82a34854edd98e10e061 (diff) | |
udp: Refactor udp_read_skb()
Delete the unnecessary while loop in udp_read_skb() for readability.
Additionally, since recv_actor() cannot return a value greater than
skb->len (see sk_psock_verdict_recv()), remove the redundant check.
Suggested-by: Cong Wang <cong.wang@bytedance.com>
Signed-off-by: Peilin Ye <peilin.ye@bytedance.com>
Link: https://lore.kernel.org/r/343b5d8090a3eb764068e9f1d392939e2b423747.1663909008.git.peilin.ye@bytedance.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/ipv4/udp.c')
| -rw-r--r-- | net/ipv4/udp.c | 46 |
1 files changed, 17 insertions, 29 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 560d9eadeaa5..d63118ce5900 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -1801,41 +1801,29 @@ EXPORT_SYMBOL(__skb_recv_udp); int udp_read_skb(struct sock *sk, skb_read_actor_t recv_actor) { - int copied = 0; - - while (1) { - struct sk_buff *skb; - int err, used; - - skb = skb_recv_udp(sk, MSG_DONTWAIT, &err); - if (!skb) - return err; + struct sk_buff *skb; + int err, copied; - if (udp_lib_checksum_complete(skb)) { - __UDP_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, - IS_UDPLITE(sk)); - __UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, - IS_UDPLITE(sk)); - atomic_inc(&sk->sk_drops); - kfree_skb(skb); - continue; - } +try_again: + skb = skb_recv_udp(sk, MSG_DONTWAIT, &err); + if (!skb) + return err; - WARN_ON_ONCE(!skb_set_owner_sk_safe(skb, sk)); - used = recv_actor(sk, skb); - if (used <= 0) { - if (!copied) - copied = used; - kfree_skb(skb); - break; - } else if (used <= skb->len) { - copied += used; - } + if (udp_lib_checksum_complete(skb)) { + int is_udplite = IS_UDPLITE(sk); + struct net *net = sock_net(sk); + __UDP_INC_STATS(net, UDP_MIB_CSUMERRORS, is_udplite); + __UDP_INC_STATS(net, UDP_MIB_INERRORS, is_udplite); + atomic_inc(&sk->sk_drops); kfree_skb(skb); - break; + goto try_again; } + WARN_ON_ONCE(!skb_set_owner_sk_safe(skb, sk)); + copied = recv_actor(sk, skb); + kfree_skb(skb); + return copied; } EXPORT_SYMBOL(udp_read_skb); |