Neil Horman 3b885787ea net: Generalize socket rx gap / receive queue overflow cmsg ... Create a new socket level option to report number of queue overflows Recently I augmented the AF_PACKET protocol to report the number of frames lost on the socket receive queue between any two enqueued frames. This value was exported via a SOL_PACKET level cmsg. AFter I completed that work it was requested that this feature be generalized so that any datagram oriented socket could make use of this option. As such I've created this patch, It creates a new SOL_SOCKET level option called SO_RXQ_OVFL, which when enabled exports a SOL_SOCKET level cmsg that reports the nubmer of times the sk_receive_queue overflowed between any two given frames. It also augments the AF_PACKET protocol to take advantage of this new feature (as it previously did not touch sk->sk_drops, which this patch uses to record the overflow count). Tested successfully by me. Notes: 1) Unlike my previous patch, this patch simply records the sk_drops value, which is not a number of drops between packets, but rather a total number of drops. Deltas must be computed in user space. 2) While this patch currently works with datagram oriented protocols, it will also be accepted by non-datagram oriented protocols. I'm not sure if thats agreeable to everyone, but my argument in favor of doing so is that, for those protocols which aren't applicable to this option, sk_drops will always be zero, and reporting no drops on a receive queue that isn't used for those non-participating protocols seems reasonable to me. This also saves us having to code in a per-protocol opt in mechanism. 3) This applies cleanly to net-next assuming that commit 977750076d (my af packet cmsg patch) is reverted Signed-off-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2009-10-12 13:26:31 -07:00
..
af_rxrpc.c	net: mark net_proto_ops as const	2009-10-07 01:10:46 -07:00
ar-accept.c	net/rxrpc: Use an IS_ERR test rather than a NULL test	2008-08-13 02:40:48 -07:00
ar-ack.c	RxRPC: Use uX/sX rather than uintX_t/intX_t types	2009-09-16 00:01:13 -07:00
ar-call.c	trivial: fix typo "to to" in multiple files	2009-09-21 15:14:55 +02:00
ar-connection.c	RxRPC: Don't attempt to reuse aborted connections	2009-06-16 21:20:14 -07:00
ar-connevent.c	RxRPC: Don't attempt to reuse aborted connections	2009-06-16 21:20:14 -07:00
ar-error.c	net: replace NIPQUAD() in net/*/	2008-10-31 00:54:56 -07:00
ar-input.c	MIB: add struct net to UDP_INC_STATS_BH	2008-07-05 21:18:48 -07:00
ar-internal.h	RxRPC: Use uX/sX rather than uintX_t/intX_t types	2009-09-16 00:01:13 -07:00
ar-key.c	RxRPC: Use uX/sX rather than uintX_t/intX_t types	2009-09-16 00:01:13 -07:00
ar-local.c	net: replace NIPQUAD() in net/*/	2008-10-31 00:54:56 -07:00
ar-output.c
ar-peer.c	net: replace NIPQUAD() in net/*/	2008-10-31 00:54:56 -07:00
ar-proc.c	net: replace NIPQUAD() in net/*/	2008-10-31 00:54:56 -07:00
ar-recvmsg.c	net: Generalize socket rx gap / receive queue overflow cmsg	2009-10-12 13:26:31 -07:00
ar-security.c	RxRPC: Allow key payloads to be passed in XDR form	2009-09-15 02:44:23 -07:00
ar-skbuff.c
ar-transport.c	net: replace NIPQUAD() in net/*/	2008-10-31 00:54:56 -07:00
Kconfig	[RXRPC]: Add missing select on CRYPTO	2007-11-30 23:30:40 +11:00
Makefile
rxkad.c	RxRPC: Allow key payloads to be passed in XDR form	2009-09-15 02:44:23 -07:00