linux-kernel - Re: [Intel-wired-lan] [PATCH 2/2] Trigger proper interrupts in igc_xsk

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Date:   Tue, 19 Apr 2022 16:19:29 +0200
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Jeff Evanson <jeff.evanson@...il.com>
Cc:     Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, jeff.evanson@....com
Subject: Re: [Intel-wired-lan] [PATCH 2/2] Trigger proper interrupts in
 igc_xsk_wakeup

Dear Jeff,


Thank you for your patch.


Am 15.04.22 um 23:05 schrieb Jeff Evanson:

1.  Add a From tag(?), so your company instead of gmail.com email is used?
2.  Please add a prefix to the commit message summary. See `git log 
--oneline drivers/net/ethernet/igc` for examples.

> in igc_xsk_wakeup, trigger the proper interrupt based on whether flags
> contains XDP_WAKEUP_RX and/or XDP_WAKEUP_TX

Nit. Please add a dot/period to the end of sentences.

Can you please add a paragraph on what system you experienced the 
problem, and how to verify your fix?

> Signed-off-by: Jeff Evanson <jeff.evanson@....com>
> ---
>   drivers/net/ethernet/intel/igc/igc_main.c | 36 +++++++++++++++++------
>   1 file changed, 27 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
> index a36a18c84aeb..d706de95dc06 100644
> --- a/drivers/net/ethernet/intel/igc/igc_main.c
> +++ b/drivers/net/ethernet/intel/igc/igc_main.c
> @@ -6073,7 +6073,7 @@ static void igc_trigger_rxtxq_interrupt(struct igc_adapter *adapter,
>   int igc_xsk_wakeup(struct net_device *dev, u32 queue_id, u32 flags)
>   {
>   	struct igc_adapter *adapter = netdev_priv(dev);
> -	struct igc_q_vector *q_vector;
> +	struct igc_q_vector *txq_vector = 0, *rxq_vector = 0;

Should you use NULL instead of 0?


Kind regards,

Paul


>   	struct igc_ring *ring;
>   
>   	if (test_bit(__IGC_DOWN, &adapter->state))
> @@ -6082,17 +6082,35 @@ int igc_xsk_wakeup(struct net_device *dev, u32 queue_id, u32 flags)
>   	if (!igc_xdp_is_enabled(adapter))
>   		return -ENXIO;
>   
> -	if (queue_id >= adapter->num_rx_queues)
> -		return -EINVAL;
> +	if (flags & XDP_WAKEUP_RX) {
> +		if (queue_id >= adapter->num_rx_queues)
> +			return -EINVAL;
>   
> -	ring = adapter->rx_ring[queue_id];
> +		ring = adapter->rx_ring[queue_id];
> +		if (!ring->xsk_pool)
> +			return -ENXIO;
>   
> -	if (!ring->xsk_pool)
> -		return -ENXIO;
> +		rxq_vector = ring->q_vector;
> +	}
> +
> +	if (flags & XDP_WAKEUP_TX) {
> +		if (queue_id >= adapter->num_tx_queues)
> +			return -EINVAL;
> +
> +		ring = adapter->tx_ring[queue_id];
> +		if (!ring->xsk_pool)
> +			return -ENXIO;
> +
> +		txq_vector = ring->q_vector;
> +	}
> +
> +	if (rxq_vector &&
> +	    !napi_if_scheduled_mark_missed(&rxq_vector->napi))
> +		igc_trigger_rxtxq_interrupt(adapter, rxq_vector);
>   
> -	q_vector = adapter->q_vector[queue_id];
> -	if (!napi_if_scheduled_mark_missed(&q_vector->napi))
> -		igc_trigger_rxtxq_interrupt(adapter, q_vector);
> +	if (txq_vector && txq_vector != rxq_vector &&
> +	    !napi_if_scheduled_mark_missed(&txq_vector->napi))
> +		igc_trigger_rxtxq_interrupt(adapter, txq_vector);
>   
>   	return 0;
>   }