From: Satoru Moriya <satoru.moriya@hds.com>
Date: Fri, 17 Jun 2011 11:58:39 +0000 (+0000)
Subject: udp: add tracepoints for queueing skb to rcvbuf
X-Git-Tag: v3.1-rc1~316^2~375
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=296f7ea75b45913d5e2067baef0812087e0b6eb9;p=pandora-kernel.git

udp: add tracepoints for queueing skb to rcvbuf

This patch adds a tracepoint to __udp_queue_rcv_skb to get the
return value of ip_queue_rcv_skb. It indicates why kernel drops
a packet at this point.

ip_queue_rcv_skb returns following values in the packet drop case:

rcvbuf is full                 : -ENOMEM
sk_filter returns error        : -EINVAL, -EACCESS, -ENOMEM, etc.
__sk_mem_schedule returns error: -ENOBUF

Signed-off-by: Satoru Moriya <satoru.moriya@hds.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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