netdev - Re: [PATCH 1/2 net] ibmvnic: Fix overflowing firmware/hardware TX queue

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Message-Id: <20170307.141444.1814957653636898496.davem@davemloft.net>
Date:   Tue, 07 Mar 2017 14:14:44 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     tlfalcon@...ux.vnet.ibm.com
Cc:     netdev@...r.kernel.org, jallen@...ux.vnet.ibm.com,
        nfont@...ux.vnet.ibm.com, wvoigt@...ibm.com
Subject: Re: [PATCH 1/2 net] ibmvnic: Fix overflowing firmware/hardware TX
 queue

From: Thomas Falcon <tlfalcon@...ux.vnet.ibm.com>
Date: Sun,  5 Mar 2017 12:18:41 -0600

> Use a counter to track the number of outstanding transmissions sent
> that have not received completions. If the counter reaches the maximum
> number of queue entries, stop transmissions on that queue. As we receive 
> more completions from firmware, wake the queue once the counter reaches 
> an acceptable level.
> 
> This patch prevents hardware/firmware TX queue from filling up and
> and generating errors.  Since incorporating this fix, internal testing
> has reported that these firmware errors have stopped.
> 
> Signed-off-by: Thomas Falcon <tlfalcon@...ux.vnet.ibm.com>

Applied.