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

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Date:   Tue, 11 Jan 2022 16:39:03 +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 17:38, Haakon Bugge <haakon.bugge@...cle.com> wrote:
> 
> 
> 
>> 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

 should read:

 # cat /sys/class/infiniband/mlx4_1/ports/1/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