Re: [PATCH net-next v3 1/6] net: ethernet: ti: am65-cpsw: Introduce multi queue Rx

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Wed, Jul 03, 2024 at 04:51:32PM +0300, Roger Quadros wrote:

[...]

> @@ -699,6 +727,14 @@ static int am65_cpsw_nuss_common_open(struct am65_cpsw_common *common)
>  		goto fail_rx;
>  	}
>  
> +	for (i = 0; i < common->rx_ch_num_flows ; i++) {
> +		napi_enable(&common->rx_chns.flows[i].napi_rx);
> +		if (common->rx_chns.flows[i].irq_disabled) {
> +			common->rx_chns.flows[i].irq_disabled = false;

Just a minor nit (not a reason to hold this back): I've been
encouraging folks to use the new netdev-genl APIs in their drivers
to map NAPIs to queues and IRQs if possible because it allows for
more expressive and interesting userland applications.

You may consider in the future using something vaguely like (this is
untested psuedo-code I just typed out):

   netif_napi_set_irq(&common->rx_chns.flows[i].napi_rx,
                      common->rx_chns.flows[i].irq);

and 

   netif_queue_set_napi(common->dev, i, NETDEV_QUEUE_TYPE_RX,
                        &common->rx_chns.flows[i].napi_rx);

To link everything together (note that RTNL must be held while doing
this -- I haven't checked your code path to see if that is true here).

For an example, see 64b62146ba9e ("net/mlx4: link NAPI instances to
queues and IRQs). 

Doing this would allow userland to get data via netlink, which you
can examine yourself by using cli.py like this:

python3 tools/net/ynl/cli.py \
  --spec Documentation/netlink/specs/netdev.yaml \
  --dump queue-get

python3 tools/net/ynl/cli.py \
  --spec Documentation/netlink/specs/netdev.yaml \
  --dump napi-get

> +			enable_irq(common->rx_chns.flows[i].irq);
> +		}
> +	}
> +
>  	for (tx = 0; tx < common->tx_ch_num; tx++) {
>  		ret = k3_udma_glue_enable_tx_chn(tx_chn[tx].tx_chn);
>  		if (ret) {
> @@ -710,12 +746,6 @@ static int am65_cpsw_nuss_common_open(struct am65_cpsw_common *common)
>  		napi_enable(&tx_chn[tx].napi_tx);
>  	}
>  
> -	napi_enable(&common->napi_rx);
> -	if (common->rx_irq_disabled) {
> -		common->rx_irq_disabled = false;
> -		enable_irq(rx_chn->irq);
> -	}
> -
>  	dev_dbg(common->dev, "cpsw_nuss started\n");
>  	return 0;
>  
> @@ -726,11 +756,24 @@ static int am65_cpsw_nuss_common_open(struct am65_cpsw_common *common)
>  		tx--;
>  	}
>  
> +	for (flow_idx = 0; i < common->rx_ch_num_flows; flow_idx++) {
> +		flow = &rx_chn->flows[flow_idx];
> +		if (!flow->irq_disabled) {
> +			disable_irq(flow->irq);
> +			flow->irq_disabled = true;
> +		}
> +		napi_disable(&flow->napi_rx);
> +	}
> +
>  	k3_udma_glue_disable_rx_chn(rx_chn->rx_chn);
>  
>  fail_rx:
> -	k3_udma_glue_reset_rx_chn(rx_chn->rx_chn, 0, rx_chn,
> -				  am65_cpsw_nuss_rx_cleanup, 0);
> +	for (i = 0; i < common->rx_ch_num_flows; i--)
> +		k3_udma_glue_reset_rx_chn(rx_chn->rx_chn, i, &rx_chn->flows[i],
> +					  am65_cpsw_nuss_rx_cleanup, !!i);
> +
> +	am65_cpsw_destroy_xdp_rxqs(common);
> +
>  	return ret;
>  }
>  
> @@ -779,12 +822,12 @@ static int am65_cpsw_nuss_common_stop(struct am65_cpsw_common *common)
>  			dev_err(common->dev, "rx teardown timeout\n");
>  	}
>  
> -	napi_disable(&common->napi_rx);
> -	hrtimer_cancel(&common->rx_hrtimer);
> -
> -	for (i = 0; i < AM65_CPSW_MAX_RX_FLOWS; i++)
> -		k3_udma_glue_reset_rx_chn(rx_chn->rx_chn, i, rx_chn,
> +	for (i = 0; i < common->rx_ch_num_flows; i++) {
> +		napi_disable(&common->rx_chns.flows[i].napi_rx);

The inverse of the above is probably true somewhere around here;
again a small piece of psuedo code for illustrative purposes:

   netif_queue_set_napi(common->dev, i, NETDEV_QUEUE_TYPE_RX, NULL);

> +		hrtimer_cancel(&common->rx_chns.flows[i].rx_hrtimer);
> +		k3_udma_glue_reset_rx_chn(rx_chn->rx_chn, i, &rx_chn->flows[i],
>  					  am65_cpsw_nuss_rx_cleanup, !!i);
> +	}
>  
>  	k3_udma_glue_disable_rx_chn(rx_chn->rx_chn);
>  




[Index of Archives]     [Linux Arm (vger)]     [ARM Kernel]     [ARM MSM]     [Linux Tegra]     [Linux WPAN Networking]     [Linux Wireless Networking]     [Maemo Users]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite Trails]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux