linux-kernel - Re: [RFC for-rc] IB/mlx4: Fix the fix for reading flow-counters

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Date:   Tue, 11 Jan 2022 16:38:19 +0000
From:   Haakon Bugge <haakon.bugge@...cle.com>
To:     Jason Gunthorpe <jgg@...pe.ca>, Yishai Hadas <yishaih@...dia.com>,
        Or Gerlitz <ogerlitz@...lanox.com>
CC:     OFED mailing list <linux-rdma@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC for-rc] IB/mlx4: Fix the fix for reading flow-counters



> On 11 Jan 2022, at 17:35, Håkon Bugge <haakon.bugge@...cle.com> wrote:
> 
> It is not logical to call iboe_process_mad() when the link-layer is
> Infiniband. Nevertheless, the commit message in commit 43bfb9729ea8
> ("IB/mlx4: Fix use of flow-counters for process_mad") explicitly state
> that iboe_process_mad() shall be called.
> 
> Without this fix, reading:

 # cat /sys/class/infiniband/mlx4_0/ports/2/counters_ext/port_xmit_data_64

(sorry, this line was of course taken as comment and was removed).


Thxs, Håkon


> 
> yields "Invalid argument", whereas with this commit, said counter can
> be read.
> 
> Please note that mlx4_1 is a VF.
> 
> Fixes: 43bfb9729ea8 ("IB/mlx4: Fix use of flow-counters for process_mad")
> Signed-off-by: Håkon Bugge <haakon.bugge@...cle.com>
> ---
> drivers/infiniband/hw/mlx4/mad.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/infiniband/hw/mlx4/mad.c b/drivers/infiniband/hw/mlx4/mad.c
> index d13ecbd..cc83782 100644
> --- a/drivers/infiniband/hw/mlx4/mad.c
> +++ b/drivers/infiniband/hw/mlx4/mad.c
> @@ -998,8 +998,8 @@ int mlx4_ib_process_mad(struct ib_device *ibdev, int mad_flags, u32 port_num,
> 		     (in->mad_hdr.attr_id == IB_PMA_PORT_COUNTERS ||
> 		      in->mad_hdr.attr_id == IB_PMA_PORT_COUNTERS_EXT ||
> 		      in->mad_hdr.attr_id == IB_PMA_CLASS_PORT_INFO)))
> -			return iboe_process_mad(ibdev, mad_flags, port_num,
> -						in_wc, in_grh, in, out);
> +			return ib_process_mad(ibdev, mad_flags, port_num,
> +					      in_wc, in_grh, in, out);
> 
> 		return ib_process_mad(ibdev, mad_flags, port_num, in_wc, in_grh,
> 				      in, out);
> -- 
> 1.8.3.1
>