netdev - RE: [Intel-wired-lan] [PATCH v2 intel-net 4/6] ice: xsk: do not clear status_error0 for ntu + nb

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Message-ID: <DM6PR11MB3292039CD30AE96145240042F1789@DM6PR11MB3292.namprd11.prod.outlook.com>
Date:   Fri, 17 Dec 2021 15:23:55 +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 4/6] ice: xsk: do not clear
 status_error0 for ntu + nb_buffs descriptor


> -----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 4/6] ice: xsk: do not clear
> status_error0 for ntu + nb_buffs descriptor
> 
> The descriptor that ntu is pointing at when we exit
> ice_alloc_rx_bufs_zc() should not have its corresponding DD bit cleared as
> descriptor is not allocated in there and it is not valid for HW usage.
> 
> The allocation routine at the entry will fill the descriptor that ntu points to
> after it was set to ntu + nb_buffs on previous call.
> 
> Even the spec says:
> "The tail pointer should be set to one descriptor beyond the last empty
> descriptor in host descriptor ring."
> 
> Therefore, step away from clearing the status_error0 on ntu + nb_buffs
> descriptor.
> 
> Fixes: db804cfc21e9 ("ice: Use the xsk batched rx allocation interface")
> Reported-by: Elza Mathew <elza.mathew@...el.com>
> Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
> ---
>  drivers/net/ethernet/intel/ice/ice_xsk.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 

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