netdev - Re: [PATCH V3 net-next 1/9] net: ena: use constant value for net

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Date:   Wed, 2 Dec 2020 22:55:09 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     akiyano@...zon.com, kuba@...nel.org, netdev@...r.kernel.org
Cc:     dwmw@...zon.com, zorik@...zon.com, matua@...zon.com,
        saeedb@...zon.com, msw@...zon.com, aliguori@...zon.com,
        nafea@...zon.com, gtzalik@...zon.com, netanel@...zon.com,
        alisaidi@...zon.com, benh@...zon.com, ndagan@...zon.com,
        shayagr@...zon.com, sameehj@...zon.com
Subject: Re: [PATCH V3 net-next 1/9] net: ena: use constant value for
 net_device allocation

Am 02.12.2020 um 21:03 schrieb akiyano@...zon.com:
> From: Arthur Kiyanovski <akiyano@...zon.com>
> 
> The patch changes the maximum number of RX/TX queues it advertises to
> the kernel (via alloc_etherdev_mq()) from a value received from the
> device to a constant value which is the minimum between 128 and the
> number of CPUs in the system.
> 
> By allocating the net_device struct with a constant number of queues,
> the driver is able to allocate it at a much earlier stage, before
> calling any ena_com functions. This would allow to make all log prints in
> ena_com to use netdev_* log functions instead or current pr_* ones.
> 

Did you test this? Usually using netdev_* before the net_device is
registered results in quite ugly messages. Therefore there's a number
of patches doing the opposite, replacing netdev_* with dev_* before
register_netdev(). See e.g.
22148df0d0bd ("r8169: don't use netif_info et al before net_device has been registered")


> Signed-off-by: Shay Agroskin <shayagr@...zon.com>
> Signed-off-by: Arthur Kiyanovski <akiyano@...zon.com>
> ---
>  drivers/net/ethernet/amazon/ena/ena_netdev.c | 46 ++++++++++----------
>  1 file changed, 23 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c
> index df1884d57d1a..985dea1870b5 100644
> --- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
> +++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
> @@ -29,6 +29,8 @@ MODULE_LICENSE("GPL");
>  /* Time in jiffies before concluding the transmitter is hung. */
>  #define TX_TIMEOUT  (5 * HZ)
>  
> +#define ENA_MAX_RINGS min_t(unsigned int, ENA_MAX_NUM_IO_QUEUES, num_possible_cpus())
> +
>  #define ENA_NAPI_BUDGET 64
>  
>  #define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_IFUP | \
> @@ -4176,18 +4178,34 @@ static int ena_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>  
>  	ena_dev->dmadev = &pdev->dev;
>  
> +	netdev = alloc_etherdev_mq(sizeof(struct ena_adapter), ENA_MAX_RINGS);
> +	if (!netdev) {
> +		dev_err(&pdev->dev, "alloc_etherdev_mq failed\n");
> +		rc = -ENOMEM;
> +		goto err_free_region;
> +	}
> +
> +	SET_NETDEV_DEV(netdev, &pdev->dev);
> +	adapter = netdev_priv(netdev);
> +	adapter->ena_dev = ena_dev;
> +	adapter->netdev = netdev;
> +	adapter->pdev = pdev;
> +	adapter->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
> +
> +	pci_set_drvdata(pdev, adapter);
> +
>  	rc = ena_device_init(ena_dev, pdev, &get_feat_ctx, &wd_state);
>  	if (rc) {
>  		dev_err(&pdev->dev, "ENA device init failed\n");
>  		if (rc == -ETIME)
>  			rc = -EPROBE_DEFER;
> -		goto err_free_region;
> +		goto err_netdev_destroy;
>  	}
>  
>  	rc = ena_map_llq_mem_bar(pdev, ena_dev, bars);
>  	if (rc) {
>  		dev_err(&pdev->dev, "ENA llq bar mapping failed\n");
> -		goto err_free_ena_dev;
> +		goto err_device_destroy;
>  	}
>  
>  	calc_queue_ctx.ena_dev = ena_dev;
> @@ -4207,26 +4225,8 @@ static int ena_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>  		goto err_device_destroy;
>  	}
>  
> -	/* dev zeroed in init_etherdev */
> -	netdev = alloc_etherdev_mq(sizeof(struct ena_adapter), max_num_io_queues);
> -	if (!netdev) {
> -		dev_err(&pdev->dev, "alloc_etherdev_mq failed\n");
> -		rc = -ENOMEM;
> -		goto err_device_destroy;
> -	}
> -
> -	SET_NETDEV_DEV(netdev, &pdev->dev);
> -
> -	adapter = netdev_priv(netdev);
> -	pci_set_drvdata(pdev, adapter);
> -
> -	adapter->ena_dev = ena_dev;
> -	adapter->netdev = netdev;
> -	adapter->pdev = pdev;
> -
>  	ena_set_conf_feat_params(adapter, &get_feat_ctx);
>  
> -	adapter->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
>  	adapter->reset_reason = ENA_REGS_RESET_NORMAL;
>  
>  	adapter->requested_tx_ring_size = calc_queue_ctx.tx_queue_size;
> @@ -4257,7 +4257,7 @@ static int ena_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>  	if (rc) {
>  		dev_err(&pdev->dev,
>  			"Failed to query interrupt moderation feature\n");
> -		goto err_netdev_destroy;
> +		goto err_device_destroy;
>  	}
>  	ena_init_io_rings(adapter,
>  			  0,
> @@ -4335,11 +4335,11 @@ static int ena_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>  	ena_disable_msix(adapter);
>  err_worker_destroy:
>  	del_timer(&adapter->timer_service);
> -err_netdev_destroy:
> -	free_netdev(netdev);
>  err_device_destroy:
>  	ena_com_delete_host_info(ena_dev);
>  	ena_com_admin_destroy(ena_dev);
> +err_netdev_destroy:
> +	free_netdev(netdev);
>  err_free_region:
>  	ena_release_bars(ena_dev, pdev);
>  err_free_ena_dev:
>