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tcp: return a drop_reason from tcp_add_backlog()

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Part of a stack canary removal from tcp_v{4,6}_rcv().

Return a drop_reason instead of a boolean, so that we no longer
have to pass the address of a local variable.

$ scripts/bloat-o-meter -t vmlinux.old vmlinux.new
add/remove: 0/0 grow/shrink: 0/3 up/down: 0/-37 (-37)
Function                                     old     new   delta
tcp_v6_rcv                                  3133    3129      -4
tcp_v4_rcv                                  3206    3202      -4
tcp_add_backlog                             1281    1252     -29
Total: Before=25567186, After=25567149, chg -0.00%

Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260409101147.1642967-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet
2026-04-09 10:11:47 +00:00
committed by Jakub Kicinski
parent 4431c239a3
commit f5148298b0
3 changed files with 12 additions and 15 deletions
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3
include/net/tcp.h
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@@ -1680,8 +1680,7 @@ static inline bool tcp_checksum_complete(struct sk_buff *skb)
__skb_checksum_complete(skb);
}
bool tcp_add_backlog(struct sock *sk, struct sk_buff *skb,
enum skb_drop_reason *reason);
enum skb_drop_reason tcp_add_backlog(struct sock *sk, struct sk_buff *skb);
static inline int tcp_filter(struct sock *sk, struct sk_buff *skb,
enum skb_drop_reason *reason)