tcp: export count for rehash attempts

Using IPv6 flow-label to swiftly route around avoid congested or disconnected network path can greatly improve TCP reliability. This patch adds SNMP counters and a OPT_STATS counter to track both host-level and connection-level statistics. Network administrators can use these counters to evaluate the impact of this new ability better. Export count for rehash attempts to 1) two SNMP counters: TcpTimeoutRehash (rehash due to timeouts), and TcpDuplicateDataRehash (rehash due to receiving duplicate packets) 2) Timestamping API SOF_TIMESTAMPING_OPT_STATS.

Abdul Kabbani committed 6 years ago

Commit 32efcc01 parent 6efca897 files · +18 −1Browse files

Showing the changes to include/linux (1 of 7 files). Show all

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include/linux/tcp.h+2−0

@@ -386,6 +386,8 @@ struct tcp_sock { · 385 unmodified lines
386	#define BPF_SOCK_OPS_TEST_FLAG(TP, ARG) 0	386	#define BPF_SOCK_OPS_TEST_FLAG(TP, ARG) 0
387	#endif	387	#endif
388		388
		389	u16 timeout_rehash; /* Timeout-triggered rehash attempts */
		390
389	u32 rcv_ooopack; /* Received out-of-order packets, for tcpinfo */	391	u32 rcv_ooopack; /* Received out-of-order packets, for tcpinfo */
390		392
391	/* Receiver side RTT estimation */	393	/* Receiver side RTT estimation */