netdev - RE: [Intel-wired-lan] [PATCH v2 intel-net 2/6] ice: xsk: allocate separate memory for XDP SW ring

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Date:   Fri, 17 Dec 2021 15:24:03 +0000
From:   "Bhandare, KiranX" <kiranx.bhandare@...el.com>
To:     "Fijalkowski, Maciej" <maciej.fijalkowski@...el.com>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>
CC:     "Mathew, Elza" <elza.mathew@...el.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "Karlsson, Magnus" <magnus.karlsson@...el.com>
Subject: RE: [Intel-wired-lan] [PATCH v2 intel-net 2/6] ice: xsk: allocate
 separate memory for XDP SW ring


> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of
> Maciej Fijalkowski
> Sent: Monday, December 13, 2021 9:01 PM
> To: intel-wired-lan@...ts.osuosl.org
> Cc: Mathew, Elza <elza.mathew@...el.com>; netdev@...r.kernel.org;
> kuba@...nel.org; bpf@...r.kernel.org; davem@...emloft.net; Karlsson,
> Magnus <magnus.karlsson@...el.com>
> Subject: [Intel-wired-lan] [PATCH v2 intel-net 2/6] ice: xsk: allocate separate
> memory for XDP SW ring
> 
> Currently, the zero-copy data path is reusing the memory region that was
> initially allocated for an array of struct ice_rx_buf for its own purposes. This
> is error prone as it is based on the ice_rx_buf struct always being the same
> size or bigger than what the zero-copy path needs.
> There can also be old values present in that array giving rise to errors when
> the zero-copy path uses it.
> 
> Fix this by freeing the ice_rx_buf region and allocating a new array for the
> zero-copy path that has the right length and is initialized to zero.
> 
> Fixes: 57f7f8b6bc0b ("ice: Use xdp_buf instead of rx_buf for xsk zero-copy")
> Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
> ---
>  drivers/net/ethernet/intel/ice/ice_base.c | 17 ++++++++++++
> drivers/net/ethernet/intel/ice/ice_txrx.c | 19 ++++++++-----
> drivers/net/ethernet/intel/ice/ice_xsk.c  | 33 ++++++++++++-----------
>  3 files changed, 47 insertions(+), 22 deletions(-)
> 

Tested-by: Kiran Bhandare <kiranx.bhandare@...el.com>  A Contingent Worker at Intel