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authorNeil Horman <nhorman@tuxdriver.com>2009-10-12 16:26:31 -0400
committerDavid S. Miller <davem@davemloft.net>2009-10-12 16:26:31 -0400
commit3b885787ea4112eaa80945999ea0901bf742707f (patch)
tree06fc15f8e8083d5652ccb4d06653d9812dce9c0b /net/key
parentd5e63bded6e819ca77ee1a1d97c783a31f6caf30 (diff)
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 977750076d98c7ff6cbda51858bb5a5894a9d9ab (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>
Diffstat (limited to 'net/key')
-rw-r--r--net/key/af_key.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/key/af_key.c b/net/key/af_key.c
index c078ae6e975b..472f6594184a 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -3606,7 +3606,7 @@ static int pfkey_recvmsg(struct kiocb *kiocb,
3606 if (err) 3606 if (err)
3607 goto out_free; 3607 goto out_free;
3608 3608
3609 sock_recv_timestamp(msg, sk, skb); 3609 sock_recv_ts_and_drops(msg, sk, skb);
3610 3610
3611 err = (flags & MSG_TRUNC) ? skb->len : copied; 3611 err = (flags & MSG_TRUNC) ? skb->len : copied;
3612 3612