[dpdk-dev] [PATCH v12] app/testpmd: support multi-process
Min Hu (Connor)
humin29 at huawei.com
Thu Apr 22 03:18:27 CEST 2021
Hi, Singh, fixed in v13, thanks.
在 2021/4/21 17:56, Singh, Aman Deep 写道:
> This patch adds multi-process support for testpmd.
>
> The test cmd example as follows:
>
> the primary cmd:
>
> ./dpdk-testpmd -a xxx --proc-type=auto -l 0-1 -- -i \
>
> --rxq=4 --txq=4 --num-procs=2 --proc-id=0
>
> the secondary cmd:
>
> ./dpdk-testpmd -a xxx --proc-type=auto -l 2-3 -- -i \
>
> --rxq=4 --txq=4 --num-procs=2 --proc-id=1
>
> Signed-off-by: Min Hu (Connor) <humin29 at huawei.com
> <mailto:humin29 at huawei.com>>
>
> Signed-off-by: Lijun Ou <oulijun at huawei.com <mailto:oulijun at huawei.com>>
>
> Acked-by: Xiaoyun Li <xiaoyun.li at intel.com <mailto:xiaoyun.li at intel.com>>
>
> Acked-by: Ajit Khaparde <ajit.khaparde at broadcom.com
> <mailto:ajit.khaparde at broadcom.com>>
>
> Reviewed-by: Ferruh Yigit <ferruh.yigit at intel.com
> <mailto:ferruh.yigit at intel.com>>
>
> ---
>
> v12:
>
> * Updated doc info.
>
> <….>
>
> diff --git a/doc/guides/testpmd_app_ug/run_app.rst
> b/doc/guides/testpmd_app_ug/run_app.rst
>
> index d062165..7414e85 100644
>
> --- a/doc/guides/testpmd_app_ug/run_app.rst
>
> +++ b/doc/guides/testpmd_app_ug/run_app.rst
>
> @@ -543,3 +543,87 @@ The command line options are:
>
> bit 1 - two hairpin ports paired
>
> bit 0 - two hairpin ports loop
>
> The default value is 0. Hairpin will use single port mode and
> implicit Tx flow mode.
>
> +
>
> +Testpmd Multi-Process Command-line Options
>
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> +
>
> +The following are the command-line options for testpmd multi-process
> support:
>
> +
>
> +.. code-block:: console
>
> +
>
> + primary process:
>
> + sudo ./dpdk-testpmd -a xxx --proc-type=auto -l 0-1 -- -i
> --rxq=4 --txq=4 \
>
> + --num-procs=2 --proc-id=0
>
> +
>
> + secondary process:
>
> + sudo ./dpdk-testpmd -a xxx --proc-type=auto -l 2-3 -- -i
> --rxq=4 --txq=4 \
>
> + --num-procs=2 --proc-id=1
>
> +
>
> +The command line options are:
>
> +
>
> +* ``--rxq=N``
>
> +
>
> + Set the number of Rx queues per port to N. N is the sum of queues
> used by primary
>
> + and secondary process. Primary process and secondary process should
> have separate
>
> + queues, and each should occupy at least one queue. Where N should
> be the multiple
>
> // [Minor Comment]: , not required
>
> + of number of processes.
>
> +
>
> +* ``--txq=N``
>
> +
>
> + Set the number of Tx queues per port to N. N is the sum of queues
> used by primary
>
> + and secondary process. Primary process and secondary process should
> have separate
>
> + queues, and each should occupy at least one queue. Where N should
> be the multiple
>
> // [Minor Comment]: , not required
>
> + of number of processes.
>
> +
>
> +* ``--num-procs=N``
>
> +
>
> + The number of processes which will be used.
>
> +
>
> +* ``--proc-id=id``
>
> +
>
> + The id of the current process (id < num-procs). id should be
> different in primary
>
> + process and secondary process, which starts from '0'.
>
> +
>
> +Calculation rule for queue:
>
> +All queues are allocated to different processes based on ``proc_num``
> and ``proc_id``.
>
> +Calculation rule for the testpmd to allocate queues to each process:
>
> +start(queue start id) = proc_id * nb_q / num_procs?
>
> +end(queue end id) = start + nb_q / num_procs?
>
> +
>
> +For example, if testpmp supports 4 Tx and Rx queues the 0~1 for primary
>
> // [Spelling] testpmp à “testpmd”, change Rx à 4 Rx
>
> +process the 2~3 for secondary process
>
> +
>
> +The number of rings should be a multiple of the number of processes. If
>
> +not, redundant queues will exist after queues are allocated to
>
> +processes. After RSS is enabled, packet loss occurs when traffic is
> sent to all processes at the same time.
>
> +Some traffic enters redundant queues and cannot be forwarded.
>
> +
>
> +All the dev ops is supported in primary process. While secondary
>
> +process is not permitted to allocate or release shared memory, so some
> ops are not supported as follows::
>
> +``dev_configure``
>
> +``dev_start``
>
> +``dev_stop``
>
> +``rx_queue_setup``
>
> +``tx_queue_setup``
>
> +``rx_queue_release``
>
> +``tx_queue_release``
>
> +
>
> +So, any command from testpmd which calls those APIs will not be
>
> +supported in secondary process, like::
>
> +``port config all rxq|txq|rxd|txd <value>`` ``port config <port_id>
>
> +rx_offload xxx on/off `` ``port config <port_id> tx_offload xxx
>
> +on/off`` etc.
>
> +
>
> +Flow API is supported, it applies only on its own process on SW side,
> but all on HW size.
>
> // [Replace] all à uniformly [Spelling] size --> side
>
> +
>
> +Stats is supported, stats will not change when one quit and start, As
>
> +they share the same buffer to store the stats. Flow rules are
>
> +maintained in process level: primary and secondary has its own flow
>
> +list (but one flow list in HW). The two can see all the queues, so
>
> +setting the flow rules for the other is OK. But in testpmd primary
>
> // [Replace] in à if
>
> +process receives or transmits packets from the queue allocated for
> secondary process is not permitted, and same for secondary process.
>
> // [Rephrase] is not permittedà it is not permitted
>
> +
>
> +RSS is supported, primary process and secondary process has separate
>
> +queues to use, RSS will work in their own queues whether primary or
> secondary process.
>
> --
>
> 2.7.4
>
> Tested-by: Aman Deep Singh <aman.deep.singh at intel.com
> <mailto:aman.deep.singh at intel.com>>
>
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