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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Date: Wed, 7 Feb 2024 14:57:14 +0100
From: Ivan Vecera <ivecera@...hat.com>
To: Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
 intel-wired-lan@...ts.osuosl.org
Cc: netdev@...r.kernel.org, anthony.l.nguyen@...el.com,
 Seth Forshee <sforshee@...nel.org>, Simon Horman <horms@...nel.org>,
 magnus.karlsson@...el.com
Subject: Re: [Intel-wired-lan] [PATCH v2 iwl-net 2/2] i40e: take into account
 XDP Tx queues when stopping rings

On 06. 02. 24 13:41, Maciej Fijalkowski wrote:
> 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(-)
> 
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
> index 2c46a5e7d222..bf1b32a15b5e 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_main.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
> @@ -4926,21 +4926,23 @@ int i40e_vsi_start_rings(struct i40e_vsi *vsi)
>   void i40e_vsi_stop_rings(struct i40e_vsi *vsi)
>   {
>   	struct i40e_pf *pf = vsi->back;
> -	int pf_q, q_end;
> +	u32 pf_q, tx_q_end, rx_q_end;
>   
>   	/* When port TX is suspended, don't wait */
>   	if (test_bit(__I40E_PORT_SUSPENDED, vsi->back->state))
>   		return i40e_vsi_stop_rings_no_wait(vsi);
>   
> -	q_end = vsi->base_queue + vsi->num_queue_pairs;
> -	for (pf_q = vsi->base_queue; pf_q < q_end; pf_q++)
> -		i40e_pre_tx_queue_cfg(&pf->hw, (u32)pf_q, false);
> +	tx_q_end = vsi->base_queue +
> +		vsi->alloc_queue_pairs * (i40e_enabled_xdp_vsi(vsi) ? 2 : 1);
> +	for (pf_q = vsi->base_queue; pf_q < tx_q_end; pf_q++)
> +		i40e_pre_tx_queue_cfg(&pf->hw, pf_q, false);
>   
> -	for (pf_q = vsi->base_queue; pf_q < q_end; pf_q++)
> +	rx_q_end = vsi->base_queue + vsi->num_queue_pairs;
> +	for (pf_q = vsi->base_queue; pf_q < rx_q_end; pf_q++)
>   		i40e_control_rx_q(pf, pf_q, false);
>   
>   	msleep(I40E_DISABLE_TX_GAP_MSEC);
> -	for (pf_q = vsi->base_queue; pf_q < q_end; pf_q++)
> +	for (pf_q = vsi->base_queue; pf_q < tx_q_end; pf_q++)
>   		wr32(&pf->hw, I40E_QTX_ENA(pf_q), 0);
>   
>   	i40e_vsi_wait_queues_disabled(vsi);

Reviewed-by: Ivan Vecera <ivecera@...hat.com>