RE: [PATCH rdma-rc 1/7] IB/core: Fix query port failure in RoCE

["Steve Wise" <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>]

> 
> From: Eli Cohen <eli-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
> 
> Currently ib_query_port always attempts to to read the subnet prefix by
> calling ib_query_gid(). For RoCE there is no subnet manager and no
> subnet prefix. Fix this by querying GID[0] only for IB networks.
> 
> Fixes: fad61ad4e755 ('IB/core: Add subnet prefix to port info')
> Signed-off-by: Eli Cohen <eli-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
> Signed-off-by: Leon Romanovsky <leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
> ---
>  drivers/infiniband/core/device.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/infiniband/core/device.c
b/drivers/infiniband/core/device.c
> index 5516fb0..05e25a3 100644
> --- a/drivers/infiniband/core/device.c
> +++ b/drivers/infiniband/core/device.c
> @@ -661,6 +661,9 @@ int ib_query_port(struct ib_device *device,
>  	if (err || port_attr->subnet_prefix)
>  		return err;
> 
> +	if (rdma_port_get_link_layer(device, port_num) !=
> IB_LINK_LAYER_INFINIBAND)
> +		return 0;
> +
>  	err = ib_query_gid(device, port_num, 0, &gid, NULL);
>  	if (err)
>  		return err;

This change assumes IB_LINK_LAYER_ETHERNET == RoCE, which isn't true for iWARP
devices.  Still, the change is good for iWARP too, but the comment should
perhaps reflect this.

Reviewed-by: Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>

Steve.

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