netdev - Re: [PATCH net] mlxsw: spectrum: Adjust headroom buffers for 8x ports

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Message-Id: <20200616.134706.855421482127630808.davem@davemloft.net>
Date:   Tue, 16 Jun 2020 13:47:06 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     idosch@...sch.org
Cc:     netdev@...r.kernel.org, kuba@...nel.org, jiri@...lanox.com,
        mlxsw@...lanox.com, idosch@...lanox.com
Subject: Re: [PATCH net] mlxsw: spectrum: Adjust headroom buffers for 8x
 ports

From: Ido Schimmel <idosch@...sch.org>
Date: Tue, 16 Jun 2020 10:14:58 +0300

> From: Ido Schimmel <idosch@...lanox.com>
> 
> The port's headroom buffers are used to store packets while they
> traverse the device's pipeline and also to store packets that are egress
> mirrored.
> 
> On Spectrum-3, ports with eight lanes use two headroom buffers between
> which the configured headroom size is split.
> 
> In order to prevent packet loss, multiply the calculated headroom size
> by two for 8x ports.
> 
> Fixes: da382875c616 ("mlxsw: spectrum: Extend to support Spectrum-3 ASIC")
> Signed-off-by: Ido Schimmel <idosch@...lanox.com>
> Reviewed-by: Jiri Pirko <jiri@...lanox.com>

Applied and queued up for -stable, thank you.