netdev - Re: [PATCH rdma-next 00/10] Optional counter statistics support

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Date:   Tue, 24 Aug 2021 09:44:26 +0800
From:   Mark Zhang <markzhang@...dia.com>
To:     Jason Gunthorpe <jgg@...dia.com>
CC:     <dledford@...hat.com>, <saeedm@...dia.com>,
        <linux-rdma@...r.kernel.org>, <netdev@...r.kernel.org>,
        <aharonl@...dia.com>, <netao@...dia.com>, <leonro@...dia.com>
Subject: Re: [PATCH rdma-next 00/10] Optional counter statistics support

On 8/24/2021 3:33 AM, Jason Gunthorpe wrote:
> On Wed, Aug 18, 2021 at 02:24:18PM +0300, Mark Zhang wrote:
>> Hi,
>>
>> This series from Aharon and Neta provides an extension to the rdma
>> statistics tool that allows to add and remove optional counters
>> dynamically, using new netlink commands.
>>
>> The idea of having optional counters is to provide to the users the
>> ability to get statistics of counters that hurts performance.
>>
>> Once an optional counter was added, its statistics will be presented
>> along with all the counters, using the show command.
>>
>> Binding objects to the optional counters is currently not supported,
>> neither in auto mode nor in manual mode.
>>
>> To get the list of optional counters that are supported on this device,
>> use "rdma statistic mode supported". To see which counters are currently
>> enabled, use "rdma statistic mode".
>>
>> $ rdma statistic mode supported
>> link rocep8s0f0/1
>>      Optional-set: cc_rx_ce_pkts cc_rx_cnp_pkts cc_tx_cnp_pkts
>> link rocep8s0f1/1
>>      Optional-set: cc_rx_ce_pkts cc_rx_cnp_pkts cc_tx_cnp_pkts
>>
>> $ sudo rdma statistic add link rocep8s0f0/1 optional-set cc_rx_ce_pkts
>> $ rdma statistic mode
>> link rocep8s0f0/1
>>      Optional-set: cc_rx_ce_pkts
>> $ sudo rdma statistic add link rocep8s0f0/1 optional-set cc_tx_cnp_pkts
>> $ rdma statistic mode
>> link rocep8s0f0/1
>>      Optional-set: cc_rx_ce_pkts cc_tx_cnp_pkts
> 
> This doesn't look like the right output to iproute to me, the two
> command should not be using the same tag and the output of iproute
> should always be formed to be valid input to iproute

So it should be like this:

$ rdma statistic mode supported
link rocep8s0f0/1 optional-set cc_rx_ce_pkts cc_rx_cnp_pkts  cc_tx_cnp_pkts
link rocep8s0f1/1 optional-set cc_rx_ce_pkts cc_rx_cnp_pkts cc_tx_cnp_pkts

$ sudo rdma statistic add link rocep8s0f0/1 optional-set cc_rx_ce_pkts
$ rdma statistic mode
link rocep8s0f0/1 optional-set cc_rx_ce_pkts
$ sudo rdma statistic add link rocep8s0f0/1 optional-set cc_tx_cnp_pkts
$ rdma statistic mode
link rocep8s0f0/1 optional-set cc_rx_ce_pkts cc_tx_cnp_pkts

> 
>> $ rdma statistic show link rocep8s0f0/1
>> link rocep8s0f0/1 rx_write_requests 0 rx_read_requests 0 rx_atomic_requests 0 out_of_buffer 0
>> out_of_sequence 0 duplicate_request 0 rnr_nak_retry_err 0 packet_seq_err 0 implied_nak_seq_err 0
>> local_ack_timeout_err 0 resp_local_length_error 0 resp_cqe_error 0 req_cqe_error 0
>> req_remote_invalid_request 0 req_remote_access_errors 0 resp_remote_access_errors 0
>> resp_cqe_flush_error 0 req_cqe_flush_error 0 roce_adp_retrans 0 roce_adp_retrans_to 0
>> roce_slow_restart 0 roce_slow_restart_cnps 0 roce_slow_restart_trans 0 rp_cnp_ignored 0
>> rp_cnp_handled 0 np_ecn_marked_roce_packets 0 np_cnp_sent 0 rx_icrc_encapsulated 0
>>      Optional-set: cc_rx_ce_pkts 0 cc_tx_cnp_pkts 0
> 
> Also looks bad, optional counters should not be marked specially at
> this point.

Will put optional counters in the last, like this:

$ rdma statistic show link rocep8s0f0/1
link rocep8s0f0/1 rx_write_requests 0 rx_read_requests 0 
rx_atomic_requests 0 out_of_buffer 0
out_of_sequence 0 duplicate_request 0 rnr_nak_retry_err 0 packet_seq_err 
0 implied_nak_seq_err 0
local_ack_timeout_err 0 resp_local_length_error 0 resp_cqe_error 0 
req_cqe_error 0
req_remote_invalid_request 0 req_remote_access_errors 0 
resp_remote_access_errors 0
resp_cqe_flush_error 0 req_cqe_flush_error 0 roce_adp_retrans 0 
roce_adp_retrans_to 0
roce_slow_restart 0 roce_slow_restart_cnps 0 roce_slow_restart_trans 0 
rp_cnp_ignored 0
rp_cnp_handled 0 np_ecn_marked_roce_packets 0 np_cnp_sent 0 
rx_icrc_encapsulated 0 cc_rx_ce_pkts 0 cc_tx_cnp_pkts 0

>> Aharon Landau (9):
>>    net/mlx5: Add support in bth_opcode as a match criteria
>>    net/mlx5: Add priorities for counters in RDMA namespaces
>>    RDMA/counters: Support to allocate per-port optional counter
>>      statistics
>>    RDMA/mlx5: Add alloc_op_port_stats() support
>>    RDMA/mlx5: Add steering support in optional flow counters
>>    RDMA/nldev: Add support to add and remove optional counters
>>    RDMA/mlx5: Add add_op_stat() and remove_op_stat() support
>>    RDMA/mlx5: Add get_op_stats() support
>>    RDMA/nldev: Add support to get current enabled optional counters
>>
>> Neta Ostrovsky (1):
>>    RDMA/nldev: Add support to get optional counters statistics
> 
> This series is in a poor order, all the core update should come first
> and the commit messages should explain what is going on when building
> out the new APIs.
> 
> The RDMA/mlx5 patches can go last

Will fix it, thanks Jason.

> Jason
>