netdev - Re: [PATCH net-next v5 0/7] dpaa

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Date:   Sat, 28 Nov 2020 23:59:57 +0100
From:   Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To:     Camelia Groza <camelia.groza@....com>
Cc:     kuba@...nel.org, brouer@...hat.com, saeed@...nel.org,
        davem@...emloft.net, madalin.bucur@....nxp.com,
        ioana.ciornei@....com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v5 0/7] dpaa_eth: add XDP support

On Wed, Nov 25, 2020 at 06:53:29PM +0200, Camelia Groza wrote:
> Enable XDP support for the QorIQ DPAA1 platforms.
> 
> Implement all the current actions (DROP, ABORTED, PASS, TX, REDIRECT). No
> Tx batching is added at this time.
> 
> Additional XDP_PACKET_HEADROOM bytes are reserved in each frame's headroom.
> 
> After transmit, a reference to the xdp_frame is saved in the buffer for
> clean-up on confirmation in a newly created structure for software
> annotations. DPAA_TX_PRIV_DATA_SIZE bytes are reserved in the buffer for
> storing this structure and the XDP program is restricted from accessing
> them.
> 
> The driver shares the egress frame queues used for XDP with the network
> stack. The DPAA driver is a LLTX driver so no explicit locking is required
> on transmission.
> 
> Changes in v2:
> - warn only once if extracting the timestamp from a received frame fails
>   in 2/7
> 
> Changes in v3:
> - drop received S/G frames when XDP is enabled in 2/7
> 
> Changes in v4:
> - report a warning if the MTU is too hight for running XDP in 2/7
> - report an error if opening the device fails in the XDP setup in 2/7
> - call xdp_rxq_info_is_reg() before unregistering in 4/7
> - minor cleanups (remove unneeded variable, print error code) in 4/7
> - add more details in the commit message in 4/7
> - did not call qman_destroy_fq() in case of xdp_rxq_info_reg() failure
> since it would lead to a double free of the fq resources in 4/7
> 
> Changes in v5:
> - report errors on XDP setup with extack in 2/7
> - checkpath fix in 4/7
> - add more details in the commit message in 4/7
> - reduce the impact of the A050385 erratum workaround code on non-erratum
> platforms in 7/7

For the series:
Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>

> 
> Camelia Groza (7):
>   dpaa_eth: add struct for software backpointers
>   dpaa_eth: add basic XDP support
>   dpaa_eth: limit the possible MTU range when XDP is enabled
>   dpaa_eth: add XDP_TX support
>   dpaa_eth: add XDP_REDIRECT support
>   dpaa_eth: rename current skb A050385 erratum workaround
>   dpaa_eth: implement the A050385 erratum workaround for XDP
> 
>  drivers/net/ethernet/freescale/dpaa/dpaa_eth.c | 465 +++++++++++++++++++++++--
>  drivers/net/ethernet/freescale/dpaa/dpaa_eth.h |  13 +
>  2 files changed, 448 insertions(+), 30 deletions(-)
> 
> --
> 1.9.1
>