netdev - Re: [PATCH net 0/4] nfp: improve signal handing on FW waits and flower control message processing

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Date:   Thu, 12 Apr 2018 22:00:55 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     jakub.kicinski@...ronome.com
Cc:     netdev@...r.kernel.org, oss-drivers@...ronome.com
Subject: Re: [PATCH net 0/4] nfp: improve signal handing on FW waits and
 flower control message processing

From: Jakub Kicinski <jakub.kicinski@...ronome.com>
Date: Wed, 11 Apr 2018 16:47:34 -0700

> The first part of this set aims to improve handling of interrupted
> waits.  Patch 1 makes waiting for management FW responses
> uninterruptible while patch 2 adds a message when signal arrives
> while waiting for an NFP mutex.  We can't interrupt execution of
> FW commands so uninterruptible sleep seems reasonable there.
> Exiting a wait for a mutex should be clean and have no side affects
> so we are allowing to abort it.  Note that both waits have rather
> large timeouts (tens of seconds).
> 
> Patches 3 and 4 improve flower offload operation under heavy load.
> Currently there is no cap on the number of queued FW notifications.
> Some of the notifications have to be processed from a workqueue
> which may lead to very large number of messages getting queued
> if workqueue never gets a chance to run.  Pieter puts a limit
> on number of queued messages, tries to drop some messages we ignore
> without queuing and process more important messages first.

Series applied, thanks Jakub.