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tcp: accecn: AccECN option failure handling

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AccECN option may fail in various way, handle these:
- Attempt to negotiate the use of AccECN on the 1st retransmitted SYN
	- From the 2nd retransmitted SYN, stop AccECN negotiation
- Remove option from SYN/ACK rexmits to handle blackholes
- If no option arrives in SYN/ACK, assume Option is not usable
        - If an option arrives later, re-enabled
- If option is zeroed, disable AccECN option processing

This patch use existing padding bits in tcp_request_sock and
holes in tcp_sock without increasing the size.

Signed-off-by: Ilpo Järvinen <ij@kernel.org>
Signed-off-by: Chia-Yu Chang <chia-yu.chang@nokia-bell-labs.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20250916082434.100722-9-chia-yu.chang@nokia-bell-labs.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Chia-Yu Chang
2025-09-18 08:47:52 +02:00
committed by Paolo Abeni
parent aa55a7dde7
commit b40671b5ee
7 changed files with 111 additions and 9 deletions
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include/uapi/linux/tcp.h
+2
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@@ -323,6 +323,8 @@ struct tcp_info {
__u32 tcpi_received_e1_bytes;
__u32 tcpi_received_e0_bytes;
__u32 tcpi_received_ce_bytes;
__u16 tcpi_accecn_fail_mode;
__u16 tcpi_accecn_opt_seen;
};
/* netlink attributes types for SCM_TIMESTAMPING_OPT_STATS */