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

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

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

 	icsk->icsk_mtup.search_high = icsk->icsk_mtup.probe_size - 1;
 	icsk->icsk_mtup.probe_size = 0;
+	NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMTUPFAIL);
 }
 static void tcp_mtup_probe_success(struct sock *sk)
 	icsk->icsk_mtup.search_low = icsk->icsk_mtup.probe_size;
 	icsk->icsk_mtup.probe_size = 0;
 	tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
+	NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMTUPSUCCESS);
 }
 /* Do a simple retransmit without using the backoff mechanisms in

Keyboard shortcuts