netdev - [PATCH 04/10] netpoll: Warn if more packets are processed than are budgeted

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Message-ID: <87k3bwp1h8.fsf_-_@xmission.com>
Date:	Fri, 14 Mar 2014 20:47:15 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	David Miller <davem@...emloft.net>
Cc:	stephen@...workplumber.org, eric.dumazet@...il.com,
	netdev@...r.kernel.org, xiyou.wangcong@...il.com, mpm@...enic.com,
	satyam.sharma@...il.com
Subject: [PATCH 04/10] netpoll: Warn if more packets are processed than are budgeted


There is already a warning for this case in the normal netpoll path,
but put a copy here in case how netpoll calls the poll functions
causes a differenet result.

netpoll will shortly call the napi poll routine with a budget 0 to
avoid any rx packets being processed.  As nothing does that today
we may encounter drivers that have problems so a netpoll specific
warning seems desirable.

Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
---
 net/core/netpoll.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index d9e3d74ec9ac..2ad330e02967 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -158,6 +158,7 @@ static int poll_one_napi(struct napi_struct *napi, int budget)
 	set_bit(NAPI_STATE_NPSVC, &napi->state);
 
 	work = napi->poll(napi, budget);
+	WARN_ONCE(work > budget, "%pF exceeded budget in poll\n", napi->poll);
 	trace_napi_poll(napi);
 
 	clear_bit(NAPI_STATE_NPSVC, &napi->state);
-- 
1.7.5.4

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