netdev - Re: [PATCH 09/15] net: hbl_en: add habanalabs Ethernet driver

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Message-ID: <20240614171618.3b65b3c9@hermes.local>
Date: Fri, 14 Jun 2024 17:16:18 -0700
From: Stephen Hemminger <stephen@...workplumber.org>
To: Omer Shpigelman <oshpigelman@...ana.ai>
Cc: linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
 netdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
 ogabbay@...nel.org, zyehudai@...ana.ai
Subject: Re: [PATCH 09/15] net: hbl_en: add habanalabs Ethernet driver

> +
> +/* get the src IP as it is done in devinet_ioctl() */
> +static int hbl_en_get_src_ip(struct hbl_aux_dev *aux_dev, u32 port_idx, u32 *src_ip)
> +{
> +	struct hbl_en_port *port = HBL_EN_PORT(aux_dev, port_idx);
> +	struct net_device *ndev = port->ndev;
> +	struct in_device *in_dev;
> +	struct in_ifaddr *ifa;
> +	int rc = 0;
> +
> +	/* for the case where no src IP is configured */
> +	*src_ip = 0;
> +
> +	/* rtnl lock should be acquired in relevant flows before taking configuration lock */
> +	if (!rtnl_is_locked()) {
> +		netdev_err(port->ndev, "Rtnl lock is not acquired, can't proceed\n");
> +		rc = -EFAULT;
> +		goto out;
> +	}
> +
> +	in_dev = __in_dev_get_rtnl(ndev);
> +	if (!in_dev) {
> +		netdev_err(port->ndev, "Failed to get IPv4 struct\n");
> +		rc = -EFAULT;
> +		goto out;
> +	}
> +
> +	ifa = rtnl_dereference(in_dev->ifa_list);
> +
> +	while (ifa) {
> +		if (!strcmp(ndev->name, ifa->ifa_label)) {
> +			/* convert the BE to native and later on it will be
> +			 * written to the HW as LE in QPC_SET
> +			 */
> +			*src_ip = be32_to_cpu(ifa->ifa_local);
> +			break;
> +		}
> +		ifa = rtnl_dereference(ifa->ifa_next);
> +	}
> +out:
> +	return rc;
> +}

Does this device require IPv4? What about users and infrastructures that use IPv6 only?
IPv4 is legacy at this point.