netdev - RE: [Intel-wired-lan] [PATCH v2 iwl-net 2/2] i40e: take into account XDP Tx queues when stopping rings

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Message-ID: <CH3PR11MB83130D9CE3E3EAF392A6AB1EEA4B2@CH3PR11MB8313.namprd11.prod.outlook.com>
Date: Fri, 9 Feb 2024 15:43:45 +0000
From: "Rout, ChandanX" <chandanx.rout@...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>, "Nguyen, Anthony L"
	<anthony.l.nguyen@...el.com>, Seth Forshee <sforshee@...nel.org>, "Simon
 Horman" <horms@...nel.org>, "Karlsson, Magnus" <magnus.karlsson@...el.com>,
	"Kuruvinakunnel, George" <george.kuruvinakunnel@...el.com>, "Nagraj, Shravan"
	<shravan.nagraj@...el.com>, "Pandey, Atul" <atul.pandey@...el.com>
Subject: RE: [Intel-wired-lan] [PATCH v2 iwl-net 2/2] i40e: take into account
 XDP Tx queues when stopping rings



>-----Original Message-----
>From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of
>Fijalkowski, Maciej
>Sent: Tuesday, February 6, 2024 6:12 PM
>To: intel-wired-lan@...ts.osuosl.org
>Cc: Fijalkowski, Maciej <maciej.fijalkowski@...el.com>;
>netdev@...r.kernel.org; Nguyen, Anthony L <anthony.l.nguyen@...el.com>;
>Seth Forshee <sforshee@...nel.org>; Simon Horman <horms@...nel.org>;
>Karlsson, Magnus <magnus.karlsson@...el.com>
>Subject: [Intel-wired-lan] [PATCH v2 iwl-net 2/2] i40e: take into account XDP Tx
>queues when stopping rings
>
>Seth reported that on his side XDP traffic can not survive a round of down/up
>against i40e interface. Dmesg output was telling us that we were not able to
>disable the very first XDP ring. That was due to the fact that in
>i40e_vsi_stop_rings() in a pre-work that is done before calling
>i40e_vsi_wait_queues_disabled(), XDP Tx queues were not taken into the
>account.
>
>To fix this, let us distinguish between Rx and Tx queue boundaries and take into
>the account XDP queues for Tx side.
>
>Reported-by: Seth Forshee <sforshee@...nel.org>
>Closes: https://lore.kernel.org/netdev/ZbkE7Ep1N1Ou17sA@do-x1extreme/
>Fixes: 65662a8dcdd0 ("i40e: Fix logic of disabling queues")
>Tested-by: Seth Forshee <sforshee@...nel.org>
>Reviewed-by: Simon Horman <horms@...nel.org>
>Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
>---
> drivers/net/ethernet/intel/i40e/i40e_main.c | 14 ++++++++------
> 1 file changed, 8 insertions(+), 6 deletions(-)
>

Tested-by: Chandan Kumar Rout <chandanx.rout@...el.com> (A Contingent Worker at Intel)