On 3/15/2018 8:01 AM, Hal Rosenstock wrote:
> On 3/15/2018 5:02 AM, Honggang LI wrote:
>> From: Honggang Li <honli@xxxxxxxxxx>
>>
>> commit f1b65df5a232 ("IB/mlx5: Add support for active_width and
>> active_speed in RoCE"). Before this patch applied, the mlx5_ib
>> driver set default active_width and active_speed to IB_WIDTH_4X
>> and IB_SPEED_QDR.
>>
>> When the RoCE port is down, the RoCE port did not negotiate the
>> active width with remote side. The active width is zero. If run
>> ibstat to require the port status, ibstat will panic as it read
>> invalid width from sys file.
>>
>> Signed-off-by: Honggang Li <honli@xxxxxxxxxx>
>> ---
>> drivers/infiniband/core/sysfs.c | 15 +++++++++++----
>> 1 file changed, 11 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/infiniband/core/sysfs.c b/drivers/infiniband/core/sysfs.c
>> index cf36ff1f0068..722e4571f4d2 100644
>> --- a/drivers/infiniband/core/sysfs.c
>> +++ b/drivers/infiniband/core/sysfs.c
>> @@ -240,6 +240,7 @@ static ssize_t rate_show(struct ib_port *p, struct port_attribute *unused,
>> struct ib_port_attr attr;
>> char *speed = "";
>> int rate; /* in deci-Gb/sec */
>> + int width;
>> ssize_t ret;
>>
>> ret = ib_query_port(p->ibdev, p->port_num, &attr);
>> @@ -278,13 +279,19 @@ static ssize_t rate_show(struct ib_port *p, struct port_attribute *unused,
>> break;
>> }
>>
>> - rate *= ib_width_enum_to_int(attr.active_width);
>> - if (rate < 0)
>> - return -EINVAL;
>> + width = ib_width_enum_to_int(attr.active_width);
>> + if (width < 0) {
>> + if (attr.state != IB_PORT_ACTIVE)
>
> Link width is valid in any PortState other than Down so I think that
> this check should be:
> if (attr.state != IB_PORT_DOWN)
>
> However, I don't think overriding width should be needed for this case
> and just returning -EINVAL should be fine regardless of port state.
> AFAIK it's the driver responsibility to populate acceptable defaults for
> such parameters. What driver(s) have this issue ? Shouldn't it be fixed
> there rather than here ?
I just noticed that you reference commit f1b65df5a232 ("IB/mlx5: Add
support for active_width and active_speed in RoCE"). Before this patch
applied, the mlx5_ib driver set default active_width and active_speed to
IB_WIDTH_4X and IB_SPEED_QDR.
Should the fix be to hw/mlx5/main.c:translate_eth_proto_oper which now has:
switch (eth_proto_oper) {
...
default:
return -EINVAL;
}
return 0;
and change default case to:
*active_width = IB_WIDTH_1X;
?
> -- Hal
>
>> + width = 1; /* default to 1X for invalid widths */
>> + else
>> + return -EINVAL;
>> + }
>> +
>> + rate *= width;
>>
>> return sprintf(buf, "%d%s Gb/sec (%dX%s)\n",
>> rate / 10, rate % 10 ? ".5" : "",
>> - ib_width_enum_to_int(attr.active_width), speed);
>> + width, speed);
>> }
>>
>> static ssize_t phys_state_show(struct ib_port *p, struct port_attribute *unused,
>>
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