linux-kernel - Re: [PATCH v6 net-next] net: mana: Add a driver for Microsoft Azure Network Adapter (MANA)

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Date:   Thu, 15 Apr 2021 14:15:25 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Dexuan Cui <decui@...rosoft.com>
Cc:     davem@...emloft.net, kuba@...nel.org, kys@...rosoft.com,
        haiyangz@...rosoft.com, sthemmin@...rosoft.com, wei.liu@...nel.org,
        liuwe@...rosoft.com, netdev@...r.kernel.org, leon@...nel.org,
        andrew@...n.ch, bernd@...rovitsch.priv.at, rdunlap@...radead.org,
        shacharr@...rosoft.com, linux-kernel@...r.kernel.org,
        linux-hyperv@...r.kernel.org
Subject: Re: [PATCH v6 net-next] net: mana: Add a driver for Microsoft Azure
 Network Adapter (MANA)

On Wed, 14 Apr 2021 22:45:19 -0700
Dexuan Cui <decui@...rosoft.com> wrote:

> +static int mana_probe_port(struct mana_context *ac, int port_idx,
> +			   struct net_device **ndev_storage)
> +{
> +	struct gdma_context *gc = ac->gdma_dev->gdma_context;
> +	struct mana_port_context *apc;
> +	struct net_device *ndev;
> +	int err;
> +
> +	ndev = alloc_etherdev_mq(sizeof(struct mana_port_context),
> +				 gc->max_num_queues);
> +	if (!ndev)
> +		return -ENOMEM;
> +
> +	*ndev_storage = ndev;
> +
> +	apc = netdev_priv(ndev);
> +	apc->ac = ac;
> +	apc->ndev = ndev;
> +	apc->max_queues = gc->max_num_queues;
> +	apc->num_queues = min_t(uint, gc->max_num_queues, MANA_MAX_NUM_QUEUES);
> +	apc->port_handle = INVALID_MANA_HANDLE;
> +	apc->port_idx = port_idx;
> +
> +	ndev->netdev_ops = &mana_devops;
> +	ndev->ethtool_ops = &mana_ethtool_ops;
> +	ndev->mtu = ETH_DATA_LEN;
> +	ndev->max_mtu = ndev->mtu;
> +	ndev->min_mtu = ndev->mtu;
> +	ndev->needed_headroom = MANA_HEADROOM;
> +	SET_NETDEV_DEV(ndev, gc->dev);
> +
> +	netif_carrier_off(ndev);
> +
> +	get_random_bytes(apc->hashkey, MANA_HASH_KEY_SIZE);

Current practice for network drivers is to use netdev_rss_key_fill() for this.