netdev - Re: [PATCH net-next 1/2] net: sparx5: switchdev: adding frame DMA functionality

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Message-ID: <20210811153132.63480934@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Wed, 11 Aug 2021 15:31:32 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Steen Hegelund <steen.hegelund@...rochip.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        <UNGLinuxDriver@...rochip.com>, <netdev@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Subject: Re: [PATCH net-next 1/2] net: sparx5: switchdev: adding frame DMA
 functionality

On Wed, 11 Aug 2021 09:59:08 +0200 Steen Hegelund wrote:
> This add frame DMA functionality to the Sparx5 platform.
> 
> Ethernet frames can be extracted or injected autonomously to or from the
> device’s DDR3/DDR3L memory and/or PCIe memory space. Linked list data
> structures in memory are used for injecting or extracting Ethernet frames.
> The FDMA generates interrupts when frame extraction or injection is done
> and when the linked lists need updating.

Something to fix:

drivers/net/ethernet/microchip/sparx5/sparx5_fdma.c: In function ‘sparx5_fdma_start’:
drivers/net/ethernet/microchip/sparx5/sparx5_fdma.c:544:6: warning: variable ‘proc_ctrl’ set but not used [-Wunused-but-set-variable]
  544 |  u32 proc_ctrl;
      |      ^~~~~~~~~