net: track success and failure of TCP PMTU probing

Track success and failure of TCP PMTU probing.

Rick Jones committed 11 years ago

Commit b56ea291 parent 0b2c2a93 files · +6 −0Browse files

Unified · Split

3 files

include/uapi/linux/snmp.h +2 −0
net/ipv4/proc.c +2 −0
net/ipv4/tcp_input.c +2 −0

include/uapi/linux/snmp.h+2−0

@@ -278,6 +278,8 @@ enum · 277 unmodified lines
278	278	LINUX_MIB_TCPACKSKIPPEDCHALLENGE, /* TCPACKSkippedChallenge */
279	279	LINUX_MIB_TCPWINPROBE, /* TCPWinProbe */
280	280	LINUX_MIB_TCPKEEPALIVE, /* TCPKeepAlive */
	281	+ LINUX_MIB_TCPMTUPFAIL, /* TCPMTUPFail */
	282	+ LINUX_MIB_TCPMTUPSUCCESS, /* TCPMTUPSuccess */
281	283	__LINUX_MIB_MAX
282	284	};
283	285

net/ipv4/proc.c+2−0

@@ -300,6 +300,8 @@ static const struct snmp_mib snmp4_net_list[] = { · 299 unmodified lines
300	300	SNMP_MIB_ITEM("TCPACKSkippedChallenge", LINUX_MIB_TCPACKSKIPPEDCHALLENGE),
301	301	SNMP_MIB_ITEM("TCPWinProbe", LINUX_MIB_TCPWINPROBE),
302	302	SNMP_MIB_ITEM("TCPKeepAlive", LINUX_MIB_TCPKEEPALIVE),
	303	+ SNMP_MIB_ITEM("TCPMTUPFail", LINUX_MIB_TCPMTUPFAIL),
	304	+ SNMP_MIB_ITEM("TCPMTUPSuccess", LINUX_MIB_TCPMTUPSUCCESS),
303	305	SNMP_MIB_SENTINEL
304	306	};
305	307

net/ipv4/tcp_input.c+2−0

@@ -2593,6 +2593,7 @@ static void tcp_mtup_probe_failed(struct sock *sk) · 2592 unmodified lines
2593	2593
2594	2594	icsk->icsk_mtup.search_high = icsk->icsk_mtup.probe_size - 1;
2595	2595	icsk->icsk_mtup.probe_size = 0;
	2596	+ NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMTUPFAIL);
2596	2597	}
2597	2598
2598	2599	static void tcp_mtup_probe_success(struct sock *sk)
@@ -2612,6 +2613,7 @@ static void tcp_mtup_probe_success(struct sock *sk) · 13 unmodified lines
2612	2613	icsk->icsk_mtup.search_low = icsk->icsk_mtup.probe_size;
2613	2614	icsk->icsk_mtup.probe_size = 0;
2614	2615	tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
	2616	+ NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMTUPSUCCESS);
2615	2617	}
2616	2618
2617	2619	/* Do a simple retransmit without using the backoff mechanisms in