netdev - Re: [PATCH net 1/1] nfp: flower: fix stats id allocation

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Date:   Tue, 17 Dec 2019 22:49:55 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     john.hurley@...ronome.com
Cc:     netdev@...r.kernel.org, simon.horman@...ronome.com,
        jakub.kicinski@...ronome.com, oss-drivers@...ronome.com
Subject: Re: [PATCH net 1/1] nfp: flower: fix stats id allocation

From: John Hurley <john.hurley@...ronome.com>
Date: Tue, 17 Dec 2019 11:28:56 +0000

> As flower rules are added, they are given a stats ID based on the number
> of rules that can be supported in firmware. Only after the initial
> allocation of all available IDs does the driver begin to reuse those that
> have been released.
> 
> The initial allocation of IDs was modified to account for multiple memory
> units on the offloaded device. However, this introduced a bug whereby the
> counter that controls the IDs could be decremented before the ID was
> assigned (where it is further decremented). This means that the stats ID
> could be assigned as -1/0xfffffff which is out of range.
> 
> Fix this by only decrementing the main counter after the current ID has
> been assigned.
> 
> Fixes: 467322e2627f ("nfp: flower: support multiple memory units for filter offloads")
> Signed-off-by: John Hurley <john.hurley@...ronome.com>
> Reviewed-by: Jakub Kicinski <jakub.kicinski@...ronome.com>

Applied and queued up for -stable, thanks.