[Intel-wired-lan] [PATCH net] idpf: distinguish vports by the dev_port attribute

[Intel-wired-lan] [PATCH net] idpf: distinguish vports by the dev_port attribute

[Michal Schmidt]

idpf registers multiple netdevs (virtual ports) for one PCI function,
but it does not provide a way for userspace to distinguish them with
sysfs attributes. Per Documentation/ABI/testing/sysfs-class-net, it is
a bug not to set dev_port for independent ports on the same PCI bus,
device and function.

Without dev_port set, systemd-udevd's default naming policy attempts
to assign the same name ("ens2f0") to all four idpf netdevs on my test
system and obviously fails, leaving three of them with the initial
eth<N> name.

With this patch, systemd-udevd is able to assign unique names to the
netdevs (e.g. "ens2f0", "ens2f0d1", "ens2f0d2", "ens2f0d3").

The Intel-provided out-of-tree idpf driver already sets dev_port. In
this patch I chose to do it in the same place in the idpf_cfg_netdev
function.

Fixes: 0fe45467a104 ("idpf: add create vport and netdev configuration")
Signed-off-by: Michal Schmidt <mschmidt@redhat.com>
---
 drivers/net/ethernet/intel/idpf/idpf_lib.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/intel/idpf/idpf_lib.c b/drivers/net/ethernet/intel/idpf/idpf_lib.c
index 5fea2fd957eb..58179bd733ff 100644
--- a/drivers/net/ethernet/intel/idpf/idpf_lib.c
+++ b/drivers/net/ethernet/intel/idpf/idpf_lib.c
@@ -783,6 +783,8 @@ static int idpf_cfg_netdev(struct idpf_vport *vport)
 	/* setup watchdog timeout value to be 5 second */
 	netdev->watchdog_timeo = 5 * HZ;
 
+	netdev->dev_port = idx;
+
 	/* configure default MTU size */
 	netdev->min_mtu = ETH_MIN_MTU;
 	netdev->max_mtu = vport->max_mtu;
-- 
2.41.0

Re: [Intel-wired-lan] [PATCH net] idpf: distinguish vports by the dev_port attribute

[Jesse Brandeburg]

On 1/18/2024 12:50 PM, Michal Schmidt wrote:
> idpf registers multiple netdevs (virtual ports) for one PCI function,
> but it does not provide a way for userspace to distinguish them with
> sysfs attributes. Per Documentation/ABI/testing/sysfs-class-net, it is
> a bug not to set dev_port for independent ports on the same PCI bus,
> device and function.
> 
> Without dev_port set, systemd-udevd's default naming policy attempts
> to assign the same name ("ens2f0") to all four idpf netdevs on my test
> system and obviously fails, leaving three of them with the initial
> eth<N> name.
> 
> With this patch, systemd-udevd is able to assign unique names to the
> netdevs (e.g. "ens2f0", "ens2f0d1", "ens2f0d2", "ens2f0d3").
> 
> The Intel-provided out-of-tree idpf driver already sets dev_port. In
> this patch I chose to do it in the same place in the idpf_cfg_netdev
> function.
> 
> Fixes: 0fe45467a104 ("idpf: add create vport and netdev configuration")
> Signed-off-by: Michal Schmidt <mschmidt@redhat.com>

LGTM! Thanks Michal! I checked our latest internal development branch
and it matches what you've added here.

Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>

Re: [Intel-wired-lan] [PATCH net] idpf: distinguish vports by the dev_port attribute

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (main)
by David S. Miller <davem@davemloft.net>:

On Thu, 18 Jan 2024 21:50:40 +0100 you wrote:
> idpf registers multiple netdevs (virtual ports) for one PCI function,
> but it does not provide a way for userspace to distinguish them with
> sysfs attributes. Per Documentation/ABI/testing/sysfs-class-net, it is
> a bug not to set dev_port for independent ports on the same PCI bus,
> device and function.
> 
> Without dev_port set, systemd-udevd's default naming policy attempts
> to assign the same name ("ens2f0") to all four idpf netdevs on my test
> system and obviously fails, leaving three of them with the initial
> eth<N> name.
> 
> [...]

Here is the summary with links:
  - [net] idpf: distinguish vports by the dev_port attribute
    https://git.kernel.org/netdev/net/c/359724fa3ab7

You are awesome, thank you!
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