netdev - Re: [PATCH v2 0/7] net: ethernet: ti: cpsw: support placing CPDMA descriptors into DDR

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Message-Id: <20170107.204835.280172002099890013.davem@davemloft.net>
Date:   Sat, 07 Jan 2017 20:48:35 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     grygorii.strashko@...com
Cc:     netdev@...r.kernel.org, mugunthanvnm@...com,
        ivan.khoronzhuk@...aro.org, nsekhar@...com,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org
Subject: Re: [PATCH v2 0/7] net: ethernet: ti: cpsw: support placing CPDMA
 descriptors into DDR

From: Grygorii Strashko <grygorii.strashko@...com>
Date: Fri, 6 Jan 2017 14:07:28 -0600

> This series intended to add support for placing CPDMA descriptors into DDR by
> introducing new module parameter "descs_pool_size" to specify size of descriptor's
> pool. The "descs_pool_size" defines total number of CPDMA
> CPPI descriptors to be used for both ingress/egress packets
> processing. If not specified - the default value 256 will be used
> which will allow to place descriptor's pool into the internal CPPI
> RAM.
> 
> In addition, added ability to re-split CPDMA pool of descriptors between RX and TX
> path via ethtool '-G' command wich will allow to configure and fix number
> of descriptors used by RX and TX path, which, then, will be split between
> RX/TX channels proportionally depending on number of RX/TX channels and
> its weight. 
> 
> This allows significantly to reduce UDP packets drop rate
> for bandwidth >301 Mbits/sec (am57x).  
> 
> Before enabling this feature, the am437x SoC has to be fixed as it's proved
> that it's not working when CPDMA descriptors placed in DDR.
> So, the patch 1 fixes this issue.

Series applied to net-next, thanks.