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Date: Sat, 10 Oct 2009 07:12:10 +0200
From: Eric Dumazet <eric.dumazet@...il.com>
To: Neil Horman <nhorman@...driver.com>
CC: netdev@...r.kernel.org, davem@...emloft.net, socketcan@...tkopp.net
Subject: Re: [PATCH] Generalize socket rx gap / receive queue overflow cmsg
(v3)
Neil Horman a écrit :
> Ok, take 3 with Erics new notes
>
> Change Notes:
>
> 1) Modified inlining of sock_recv_ts_and_drops to be more efficient
>
> 2) modify getsockopt for SO_RXQ_OVFL to gurantee only a 1 or 0 return
>
> =============================================================
>
>
> 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:
> diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
> --- a/net/ipv4/udp.c
> +++ b/net/ipv4/udp.c
> @@ -951,7 +951,7 @@ try_again:
> UDP_INC_STATS_USER(sock_net(sk),
> UDP_MIB_INDATAGRAMS, is_udplite);
>
> - sock_recv_timestamp(msg, sk, skb);
> + sock_recv_ts_and_drops(msg, sk, skb);
>
> /* Copy the address. */
> if (sin) {
As a followup to my patch about udp_poll(), I realize we dont atomic_inc(&sk->sk_drops)
in the event a packet is dropped because of a bad checksum.
I'll post a fixup once David reviewed previous patch
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