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can: etas_es58x: es58x_init_netdev: populate net_device::dev_port
The field dev_port of struct net_device indicates the port number of a network device [1]. This patch populates this field. This field can be helpful to distinguish between the two network interfaces of a dual channel device (i.e. ES581.4 or ES582.1). Indeed, at the moment, all the network interfaces of a same device share the same static udev attributes c.f. output of: | udevadm info --attribute-walk /sys/class/net/canX The dev_port attribute can then be used to write some udev rules to, for example, assign a permanent name to each network interface based on the serial/dev_port pair (which is convenient when you have a test bench with several CAN devices connected simultaneously and wish to keep consistent interface names upon reboot). [1] https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-class-net Link: https://lore.kernel.org/all/20211026180553.1953189-1-mailhol.vincent@wanadoo.fr Suggested-by: Lukas Magel <lukas.magel@escrypt.com> Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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@ -2094,6 +2094,7 @@ static int es58x_init_netdev(struct es58x_device *es58x_dev, int channel_idx)
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netdev->netdev_ops = &es58x_netdev_ops;
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netdev->flags |= IFF_ECHO; /* We support local echo */
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netdev->dev_port = channel_idx;
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ret = register_candev(netdev);
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if (ret)
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