netdev - Re: [PATCH v2 net] ibmvnic: Do not reset dql stats on NON

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Date: Thu, 29 Jun 2023 11:12:48 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Nick Child <nnac123@...ux.ibm.com>
Cc: netdev@...r.kernel.org, haren@...ux.ibm.com, ricklind@...ibm.com
Subject: Re: [PATCH v2 net] ibmvnic: Do not reset dql stats on NON_FATAL err

On Wed, 28 Jun 2023 13:22:44 -0500 Nick Child wrote:
> All ibmvnic resets, make a call to netdev_tx_reset_queue() when
> re-opening the device. netdev_tx_reset_queue() resets the num_queued
> and num_completed byte counters. These stats are used in Byte Queue
> Limit (BQL) algorithms. The difference between these two stats tracks
> the number of bytes currently sitting on the physical NIC. ibmvnic
> increases the number of queued bytes though calls to
> netdev_tx_sent_queue() in the drivers xmit function. When, VIOS reports
> that it is done transmitting bytes, the ibmvnic device increases the
> number of completed bytes through calls to netdev_tx_completed_queue().
> It is important to note that the driver batches its transmit calls and
> num_queued is increased every time that an skb is added to the next
> batch, not necessarily when the batch is sent to VIOS for transmission.

Applied, thanks!