netdev - RE: [Intel-wired-lan] [PATCH intel-net 1/3] ice: synchronize

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Date:   Thu, 31 Mar 2022 13:01:49 +0000
From:   "Nagaraju, Shwetha" <shwetha.nagaraju@...el.com>
To:     "Fijalkowski, Maciej" <maciej.fijalkowski@...el.com>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>
CC:     "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 intel-net 1/3] ice: synchronize_rcu()
 when terminating rings



> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of
> Maciej Fijalkowski
> Sent: Friday, March 18, 2022 12:06 AM
> To: intel-wired-lan@...ts.osuosl.org
> Cc: 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 intel-net 1/3] ice: synchronize_rcu() when
> terminating rings
> 
> Unfortunately, the ice driver doesn't respect the RCU critical section that XSK
> wakeup is surrounded with. To fix this, add synchronize_rcu() calls to paths
> that destroy resources that might be in use.
> 
> This was addressed in other AF_XDP ZC enabled drivers, for reference see
> for example commit b3873a5be757 ("net/i40e: Fix concurrency issues
> between config flow and XSK")
> 
> Fixes: efc2214b6047 ("ice: Add support for XDP")
> Fixes: 2d4238f55697 ("ice: Add support for AF_XDP")
> Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
> ---
>  drivers/net/ethernet/intel/ice/ice.h      | 2 +-
>  drivers/net/ethernet/intel/ice/ice_main.c | 4 +++-
> drivers/net/ethernet/intel/ice/ice_xsk.c  | 4 +++-
>  3 files changed, 7 insertions(+), 3 deletions(-)
> 
Tested-by: Shwetha Nagaraju <Shwetha.nagaraju@...el.com>