netdev - Re: [PATCH v1 iproute2-next 1/4] rdma: add helper rd_sendrecv

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Date:   Thu, 28 Feb 2019 14:10:06 -0600
From:   Steve Wise <swise@...ngridcomputing.com>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     dsahern@...il.com, stephen@...workplumber.org,
        netdev@...r.kernel.org, linux-rdma@...r.kernel.org
Subject: Re: [PATCH v1 iproute2-next 1/4] rdma: add helper rd_sendrecv_msg()


On 2/28/2019 1:56 PM, Leon Romanovsky wrote:
> On Thu, Feb 28, 2019 at 01:41:20PM -0600, Steve Wise wrote:
>> On 2/23/2019 3:26 AM, Leon Romanovsky wrote:
>>> On Thu, Feb 21, 2019 at 08:19:03AM -0800, Steve Wise wrote:
>>>> This function sends the constructed netlink message and then
>>>> receives the response, displaying any error text.
>>>>
>>>> Change 'rdma dev set' to use it.
>>>>
>>>> Signed-off-by: Steve Wise <swise@...ngridcomputing.com>
>>>> ---
>>>>  rdma/dev.c   |  2 +-
>>>>  rdma/rdma.h  |  1 +
>>>>  rdma/utils.c | 21 +++++++++++++++++++++
>>>>  3 files changed, 23 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/rdma/dev.c b/rdma/dev.c
>>>> index 60ff4b31e320..d2949c378f08 100644
>>>> --- a/rdma/dev.c
>>>> +++ b/rdma/dev.c
>>>> @@ -273,7 +273,7 @@ static int dev_set_name(struct rd *rd)
>>>>  	mnl_attr_put_u32(rd->nlh, RDMA_NLDEV_ATTR_DEV_INDEX, rd->dev_idx);
>>>>  	mnl_attr_put_strz(rd->nlh, RDMA_NLDEV_ATTR_DEV_NAME, rd_argv(rd));
>>>>
>>>> -	return rd_send_msg(rd);
>>>> +	return rd_sendrecv_msg(rd, seq);
>>>>  }
>>>>
>>>>  static int dev_one_set(struct rd *rd)
>>>> diff --git a/rdma/rdma.h b/rdma/rdma.h
>>>> index 547bb5749a39..20be2f12c4f8 100644
>>>> --- a/rdma/rdma.h
>>>> +++ b/rdma/rdma.h
>>>> @@ -115,6 +115,7 @@ bool rd_check_is_key_exist(struct rd *rd, const char *key);
>>>>   */
>>>>  int rd_send_msg(struct rd *rd);
>>>>  int rd_recv_msg(struct rd *rd, mnl_cb_t callback, void *data, uint32_t seq);
>>>> +int rd_sendrecv_msg(struct rd *rd, unsigned int seq);
>>>>  void rd_prepare_msg(struct rd *rd, uint32_t cmd, uint32_t *seq, uint16_t flags);
>>>>  int rd_dev_init_cb(const struct nlmsghdr *nlh, void *data);
>>>>  int rd_attr_cb(const struct nlattr *attr, void *data);
>>>> diff --git a/rdma/utils.c b/rdma/utils.c
>>>> index 069d44fece10..a6f2826c9605 100644
>>>> --- a/rdma/utils.c
>>>> +++ b/rdma/utils.c
>>>> @@ -664,6 +664,27 @@ int rd_recv_msg(struct rd *rd, mnl_cb_t callback, void *data, unsigned int seq)
>>>>  	return ret;
>>>>  }
>>>>
>>>> +static int null_cb(const struct nlmsghdr *nlh, void *data)
>>>> +{
>>>> +	return MNL_CB_OK;
>>>> +}
>>>> +
>>>> +int rd_sendrecv_msg(struct rd *rd, unsigned int seq)
>>>> +{
>>>> +	int ret;
>>>> +
>>>> +	ret = rd_send_msg(rd);
>>>> +	if (ret) {
>>>> +		perror(NULL);
>>> This is more or less already done in rd_send_msg() and that function
>>> prints something in case of execution error. So the missing piece
>>> is to update rd_recv_msg(), so all places will "magically" print errors
>>> and not only dev_set_name().
>> Hey Leon,
>>
>> Displaying errors in rd_recv_msg() as you suggested:
>>
>> @@ -693,10 +693,28 @@ int rd_recv_msg(struct rd *rd, mnl_cb_t callback,
>> void *data, unsigned int seq)
>>                 ret = mnl_cb_run(buf, ret, seq, portid, callback, data);
>>         } while (ret > 0);
>>
>> +       if (ret < 0)
>> +               perror(NULL);
>> +
>>         mnl_socket_close(rd->nl);
>>         return ret;
>>  }
>>
>> Causes problems when doing filtered dumps:
>>
>> [root@...vo1 iproute2]# ./rdma/rdma res show qp
>> link mlx5_0/1 lqpn 1 type GSI state RTS sq-psn 0 comm [ib_core]
>> link mlx5_0/1 lqpn 176 type UD state RTS sq-psn 0 comm [ib_core]
>> link mlx5_1/1 lqpn 1 type GSI state RTS sq-psn 0 comm [ib_core]
>> link mlx5_1/1 lqpn 2224 type UD state RTS sq-psn 0 comm [ib_core]
>> link rxe_foo0/1 lqpn 1 type GSI state RTS sq-psn 0 comm [ib_core]
>> [root@...vo1 iproute2]# ./rdma/rdma res show qp  lqpn 2224
>> Invalid argument
>> No such file or directory
> Why do we it? We are supposed to check "invalid argument" before sending
> message and are not supposed to see perror(). I'm not near code right
> now, so most probably wrong in my assumption.

I'm still investigating, but I _think_ it is because mnl_run_cb(),
called by rd_recv_msg() returns the return code from the callback
function.  So the resource callback functions must be returning an error
when a returned resource doesn't match the filter.  Maybe.  It is
related to doing a rdma res dump where you specify a filter...