Re: [dpdk-dev] [PATCH v2 1/1] net/mlx5: fix device probing for old kernel drivers

[Shahaf Shuler <shahafs@mellanox.com>]

Friday, April 5, 2019 4:26 PM, Viacheslav Ovsiienko:
> Subject: [dpdk-dev] [PATCH v2 1/1] net/mlx5: fix device probing for old
> kernel drivers
> 
> Retrieving network interface index via Netlink fails in case of old ib_core
> kernel driver installed - mlx5_nl_ifindex() routine fails due to
> RDMA_NLDEV_ATTR_NDEV_INDEX attribute is not supported by the old
> driver.
> 
> The patch allowing to retrieve the network interface index and name via
> Netlink [1]. So, the problem depends on ib_core module version - 4.16
> supports getting ifindex via Netlink, 4.15 does not.
> 
> This error was ignored in previous versions of MLX5 PMD probing routine. For
> single device ifindex was retrieved via sysfs and link control was not lost, so
> problem just was not noticed.
> In order to support MLX5 PMD functioning over old kernel driver this patch
> adds ifindex retrieving via sysfs into probing routine.
> It is worth to note this method works for master/standalone device only.
> 
> [1]
> https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww
> .spinics.net%2Flists%2Flinux-
> rdma%2Fmsg62948.html&data=02%7C01%7Cshahafs%40mellanox.com
> %7C0968f75813714ee221ac08d6b9ca45ea%7Ca652971c7d2e4d9ba6a4d149256
> f461b%7C0%7C0%7C636900675741983483&sdata=ONhYWfZ7Y4zEOunEd
> wx9H0zyOiFIyzHDxnw7MXtTIAk%3D&reserved=0
>     Linux tree: 5b2cc79d (Leon Romanovsky 2018-03-27 20:40:49 +0300 270)
> 
> Fixes: ad74bc619504 ("net/mlx5: support multiport IB device during probing")
> 
> Signed-off-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>

Applied to next-net-mlx, thanks.