netdev - Re: [PATCH net v2] net: mvpp2: prs: Don't override the sign bit in SRAM parser shift

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Date:   Tue, 25 Jun 2019 14:04:12 +0200
From:   Maxime Chevallier <maxime.chevallier@...tlin.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Antoine Tenart <antoine.tenart@...tlin.com>,
        thomas.petazzoni@...tlin.com, gregory.clement@...tlin.com,
        nadavh@...vell.com, stefanc@...vell.com, mw@...ihalf.com,
        Alan Winkowski <walan@...vell.com>
Subject: Re: [PATCH net v2] net: mvpp2: prs: Don't override the sign bit in
 SRAM parser shift

Hello David,

On Thu, 20 Jun 2019 11:42:45 +0200
Maxime Chevallier <maxime.chevallier@...tlin.com> wrote:

>The Header Parser allows identifying various fields in the packet
>headers, used for various kind of filtering and classification
>steps.
>
>This is a re-entrant process, where the offset in the packet header
>depends on the previous lookup results. This offset is represented in
>the SRAM results of the TCAM, as a shift to be operated.
>
>This shift can be negative in some cases, such as in IPv6 parsing.
>
>This commit prevents overriding the sign bit when setting the shift
>value, which could cause instabilities when parsing IPv6 flows.
>
>Fixes: 3f518509dedc ("ethernet: Add new driver for Marvell Armada 375 network unit")
>Suggested-by: Alan Winkowski <walan@...vell.com>
>Signed-off-by: Maxime Chevallier <maxime.chevallier@...tlin.com>
>---
>V2 : Fix a typo in the commit log, reported by Sergei.

I see that this patch was set as "Accepted" on patchwork, but hasn't
made it to -net, I was wondering if this patch slipped through the
cracks :)

https://patchwork.ozlabs.org/patch/1119311/

Thanks,

Maxime