netdev - Re: [PATCH rdma-next v2 13/17] RDMA/core: Get sum value of all counters when perform a sysfs stat read

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Date:   Thu, 30 May 2019 06:01:46 +0000
From:   Mark Zhang <markz@...lanox.com>
To:     Jason Gunthorpe <jgg@...pe.ca>, Leon Romanovsky <leon@...nel.org>
CC:     Doug Ledford <dledford@...hat.com>,
        RDMA mailing list <linux-rdma@...r.kernel.org>,
        Majd Dibbiny <majd@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        linux-netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH rdma-next v2 13/17] RDMA/core: Get sum value of all
 counters when perform a sysfs stat read

On 5/29/2019 11:44 PM, Jason Gunthorpe wrote:
> On Wed, May 29, 2019 at 02:05:24PM +0300, Leon Romanovsky wrote:
>> On Wed, May 22, 2019 at 02:26:36PM -0300, Jason Gunthorpe wrote:
>>> On Mon, Apr 29, 2019 at 11:34:49AM +0300, Leon Romanovsky wrote:
>>>> diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
>>>> index c56ffc61ab1e..8ae4906a60e7 100644
>>>> +++ b/drivers/infiniband/core/device.c
>>>> @@ -1255,7 +1255,11 @@ int ib_register_device(struct ib_device *device, const char *name)
>>>>   		goto dev_cleanup;
>>>>   	}
>>>>
>>>> -	rdma_counter_init(device);
>>>> +	ret = rdma_counter_init(device);
>>>> +	if (ret) {
>>>> +		dev_warn(&device->dev, "Couldn't initialize counter\n");
>>>> +		goto sysfs_cleanup;
>>>> +	}
>>>
>>> Don't put this things randomly, if there is some reason it should be
>>> after sysfs it needs a comment, otherwise if it is just allocating
>>> memory it belongs earlier, and the unwind should be done in release.
>>>
>>> I also think it is very strange/wrong that both sysfs and counters are
>>> allocating the same alloc_hw_stats object
>>>
>>> Why can't they share?
>>
>> They can, but we wanted to separate "legacy" counters which were exposed
>> through sysfs and "new" counters which can be enabled/disable automatically.
> 
> Is there any cross contamination through the hw_stats? If no they
> should just share. >

sysfs hw_stats holds the port counter, while this one holds the
history value of all dynamically allocated counters. They can not share.
port_counter =
   default_counter + running_dynamic_counter + history_dynamic_counter

> Jason
>