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net: change sock_queue_rcv_skb_reason() to return a drop_reason

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Change sock_queue_rcv_skb_reason() to return the drop_reason directly
instead of using a reference.

This is part of an effort to remove stack canaries and reduce bloat.

$ scripts/bloat-o-meter -t vmlinux.old vmlinux.new
add/remove: 0/0 grow/shrink: 3/7 up/down: 79/-301 (-222)
Function                                     old     new   delta
vsock_queue_rcv_skb                           50      79     +29
ipmr_cache_report                           1290    1315     +25
ip6mr_cache_report                          1322    1347     +25
packet_rcv_spkt                              329     327      -2
sock_queue_rcv_skb_reason                    166     128     -38
raw_rcv_skb                                  122      80     -42
ping_queue_rcv_skb                           109      61     -48
ping_rcv                                     215     162     -53
rawv6_rcv_skb                                278     224     -54
raw_rcv                                      591     527     -64
Total: Before=29722890, After=29722668, chg -0.00%

Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260409145625.2306224-2-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet
2026-04-09 14:56:20 +00:00
committed by Jakub Kicinski
parent 4431c239a3
commit 900f27fb79
9 changed files with 34 additions and 26 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
include/net/sock.h
View File

@@ -2502,12 +2502,23 @@ int __sk_queue_drop_skb(struct sock *sk, struct sk_buff_head *sk_queue,
struct sk_buff *skb));
int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
int sock_queue_rcv_skb_reason(struct sock *sk, struct sk_buff *skb,
enum skb_drop_reason *reason);
enum skb_drop_reason
sock_queue_rcv_skb_reason(struct sock *sk, struct sk_buff *skb);
static inline int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
{
return sock_queue_rcv_skb_reason(sk, skb, NULL);
enum skb_drop_reason drop_reason = sock_queue_rcv_skb_reason(sk, skb);
switch (drop_reason) {
case SKB_DROP_REASON_SOCKET_RCVBUFF:
return -ENOMEM;
case SKB_DROP_REASON_PROTO_MEM:
return -ENOBUFS;
case 0:
return 0;
default:
return -EPERM;
}
}
int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb);