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 14:07:40 -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_query_vport_cfg(struct mana_port_context *apc, u32 vport_index,
> +				u32 *max_sq, u32 *max_rq, u32 *num_indir_entry)
> +{
> +	struct mana_query_vport_cfg_resp resp = {};
> +	struct mana_query_vport_cfg_req req = {};
> +	int err;
> +
> +	mana_gd_init_req_hdr(&req.hdr, MANA_QUERY_VPORT_CONFIG,
> +			     sizeof(req), sizeof(resp));
> +
> +	req.vport_index = vport_index;
> +
> +	err = mana_send_request(apc->ac, &req, sizeof(req), &resp,
> +				sizeof(resp));
> +	if (err)
> +		return err;
> +
> +	err = mana_verify_resp_hdr(&resp.hdr, MANA_QUERY_VPORT_CONFIG,
> +				   sizeof(resp));
> +	if (err)
> +		return err;
> +
> +	if (resp.hdr.status)
> +		return -EPROTO;
> +
> +	*max_sq = resp.max_num_sq;
> +	*max_rq = resp.max_num_rq;
> +	*num_indir_entry = resp.num_indirection_ent;
> +
> +	apc->port_handle = resp.vport;
> +	memcpy(apc->mac_addr, resp.mac_addr, ETH_ALEN);

You could use ether_addr_copy here.


> +int mana_do_attach(struct net_device *ndev, enum mana_attach_caller caller)
> +{
> +	struct mana_port_context *apc = netdev_priv(ndev);
> +	struct gdma_dev *gd = apc->ac->gdma_dev;
> +	u32 max_txq, max_rxq, max_queues;
> +	int port_idx = apc->port_idx;
> +	u32 num_indirect_entries;
> +	int err;
> +
> +	if (caller == MANA_OPEN)
> +		goto start_open;
> +
> +	err = mana_init_port_context(apc);
> +	if (err)
> +		return err;
> +
> +	err = mana_query_vport_cfg(apc, port_idx, &max_txq, &max_rxq,
> +				   &num_indirect_entries);
> +	if (err) {
> +		netdev_err(ndev, "Failed to query info for vPort 0\n");
> +		goto reset_apc;
> +	}
> +
> +	max_queues = min_t(u32, max_txq, max_rxq);
> +	if (apc->max_queues > max_queues)
> +		apc->max_queues = max_queues;
> +
> +	if (apc->num_queues > apc->max_queues)
> +		apc->num_queues = apc->max_queues;
> +
> +	memcpy(ndev->dev_addr, apc->mac_addr, ETH_ALEN);

And here use ether_addr_copy().