netdev - RE: [Intel-wired-lan] [PATCH v2 iwl-net 1/2] i40e: avoid double calling i40e_pf_rxq

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Date: Fri, 9 Feb 2024 15:47:31 +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>, 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 1/2] i40e: avoid double
 calling i40e_pf_rxq_wait()



>-----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: netdev@...r.kernel.org; Fijalkowski, Maciej
><maciej.fijalkowski@...el.com>; Nguyen, Anthony L
><anthony.l.nguyen@...el.com>; Simon Horman <horms@...nel.org>;
>Karlsson, Magnus <magnus.karlsson@...el.com>
>Subject: [Intel-wired-lan] [PATCH v2 iwl-net 1/2] i40e: avoid double calling
>i40e_pf_rxq_wait()
>
>Currently, when interface is being brought down and
>i40e_vsi_stop_rings() is called, i40e_pf_rxq_wait() is called two times, which is
>wrong. To showcase this scenario, simplified call stack looks as follows:
>
>i40e_vsi_stop_rings()
>	i40e_control wait rx_q()
>		i40e_control_rx_q()
>		i40e_pf_rxq_wait()
>	i40e_vsi_wait_queues_disabled()
>		i40e_pf_rxq_wait()  // redundant call
>
>To fix this, let us s/i40e_control_wait_rx_q/i40e_control_rx_q within
>i40e_vsi_stop_rings().
>
>Fixes: 65662a8dcdd0 ("i40e: Fix logic of disabling queues")
>Reviewed-by: Simon Horman <horms@...nel.org>
>Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
>---
> drivers/net/ethernet/intel/i40e/i40e_main.c | 12 +++---------
> 1 file changed, 3 insertions(+), 9 deletions(-)
>

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