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tcp: remove unused hash_size from struct tcp_out_options

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hash_size is declared but never read. The MD5 path always uses a
fixed size of 16, and the TCP-AO path uses tcp_ao_maclen().

This closes a 7-byte hole and reduces the struct size from 96 to
88 bytes.

Suggested-by: Jakub Sitnicki <jakub@cloudflare.com>
Signed-off-by: Keita Morisaki <kmta1236@gmail.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260307051619.51685-1-kmta1236@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Keita Morisaki 2026-03-07 14:16:19 +09:00 committed by Jakub Kicinski
parent 2ed4b46b4f
commit 8ca8eb0576
1 changed files with 0 additions and 1 deletions
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net/ipv4/tcp_output.c
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@ -441,7 +441,6 @@ struct tcp_out_options {
u8 ws; /* window scale, 0 to disable */
u8 num_accecn_fields:7, /* number of AccECN fields needed */
use_synack_ecn_bytes:1; /* Use synack_ecn_bytes or not */
u8 hash_size; /* bytes in hash_location */
__u8 *hash_location; /* temporary pointer, overloaded */
__u32 tsval, tsecr; /* need to include OPTION_TS */
struct tcp_fastopen_cookie *fastopen_cookie; /* Fast open cookie */