diff options
| author | Chia-Yu Chang <chia-yu.chang@nokia-bell-labs.com> | 2025-09-16 11:24:32 +0300 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2025-09-18 09:47:52 +0300 |
| commit | b40671b5ee588c8a61b2d0eacbad32ffc57e9a8f (patch) | |
| tree | 02ce18b911b45d19e014de4c9d9d0fc8f093171e /include/linux | |
| parent | aa55a7dde7ec506bb23448a5005ae3f4f809d022 (diff) | |
| download | linux-b40671b5ee588c8a61b2d0eacbad32ffc57e9a8f.tar.xz | |
tcp: accecn: AccECN option failure handling
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>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/tcp.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/tcp.h b/include/linux/tcp.h index f637b659b35a..3ca5ed02de6d 100644 --- a/include/linux/tcp.h +++ b/include/linux/tcp.h @@ -173,6 +173,7 @@ struct tcp_request_sock { u8 syn_ect_snt: 2, syn_ect_rcv: 2, accecn_fail_mode:4; + u8 saw_accecn_opt :2; #ifdef CONFIG_TCP_AO u8 ao_keyid; u8 ao_rcv_next; @@ -407,7 +408,8 @@ struct tcp_sock { syn_fastopen_child:1; /* created TFO passive child socket */ u8 keepalive_probes; /* num of allowed keep alive probes */ - u8 accecn_fail_mode:4; /* AccECN failure handling */ + u8 accecn_fail_mode:4, /* AccECN failure handling */ + saw_accecn_opt:2; /* An AccECN option was seen */ u32 tcp_tx_delay; /* delay (in usec) added to TX packets */ /* RTT measurement */ |