netdev - Re: [PATCH net-next 0/6] sfc: rework locking around filter management

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Date:   Tue, 27 Mar 2018 13:34:15 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     ecree@...arflare.com
Cc:     linux-net-drivers@...arflare.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 0/6] sfc: rework locking around filter
 management

From: Edward Cree <ecree@...arflare.com>
Date: Tue, 27 Mar 2018 17:40:11 +0100

> The use of a spinlock to protect filter state combined with the need for a
>  sleeping operation (MCDI) to apply that state to the NIC (on EF10) led to
>  unfixable race conditions, around the handling of filter restoration after
>  an MC reboot.
> So, this patch series removes the requirement to be able to modify the SW
>  filter table from atomic context, by using a workqueue to request
>  asynchronous filter operations (which are needed for ARFS).  Then, the
>  filter table locks are changed to mutexes, replacing the dance of spinlocks
>  and 'busy' flags.  Also, a mutex is added to protect the RSS context state,
>  since otherwise a similar race is possible around restoring that after an
>  MC reboot.  While we're at it, fix a couple of other related bugs.

Series applied, thank you.