[dpdk-dev] [PATCH v17] app/testpmd: support multi-process

["Min Hu (Connor)" <humin29@huawei.com>]

This patch adds multi-process support for testpmd.
For example the following commands run two testpmd
processes:

 * the primary process:

./dpdk-testpmd --proc-type=auto -l 0-1 -- -i \
   --rxq=4 --txq=4 --num-procs=2 --proc-id=0

 * the secondary process:

./dpdk-testpmd --proc-type=auto -l 2-3 -- -i \
   --rxq=4 --txq=4 --num-procs=2 --proc-id=1

Signed-off-by: Min Hu (Connor) <humin29@huawei.com>
Signed-off-by: Lijun Ou <oulijun@huawei.com>
Signed-off-by: Andrew Rybchenko <Andrew.Rybchenko@oktetlabs.ru>
Acked-by: Xiaoyun Li <xiaoyun.li@intel.com>
Acked-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>
Acked-by: Aman Deep Singh <aman.deep.singh@intel.com>
---
v17:
rebase 21.11

V16:
* revert unrelated changes.
* add some restrictions in doc. 

v15:
* Fixed release notes.
* Cleanup documentation.

v14:
* Fixed comments by Andrew Rybchenko.

v13:
* Modified the doc syntax.

v12:
* Updated doc info.

v11:
* Fixed some minor syntax.

v10:
* Hid process type checks behind new functions.
* Added comments.

v9:
* Updated release notes and rst doc.
* Deleted deprecated codes.
* move macro and variable.

v8:
* Added warning info about queue numbers and process numbers.

v7:
* Fixed compiling error for unexpected unindent.

v6:
* Add rte flow description for multiple process.

v5:
* Fixed run_app.rst for multiple process description.
* Fix compiling error.

v4:
* Fixed minimum vlaue of Rxq or Txq in doc.

v3:
* Fixed compiling error using gcc10.0.

v2:
* Added document for this patch.
---
 app/test-pmd/cmdline.c                 |  6 +++
 app/test-pmd/config.c                  | 20 ++++++-
 app/test-pmd/parameters.c              |  9 ++++
 app/test-pmd/testpmd.c                 | 95 +++++++++++++++++++++++++++++-----
 app/test-pmd/testpmd.h                 |  9 ++++
 doc/guides/rel_notes/release_21_11.rst |  4 ++
 doc/guides/testpmd_app_ug/run_app.rst  | 84 ++++++++++++++++++++++++++++++
 7 files changed, 214 insertions(+), 13 deletions(-)

diff --git a/app/test-pmd/cmdline.c b/app/test-pmd/cmdline.c
index 82253bc..395122b 100644
--- a/app/test-pmd/cmdline.c
+++ b/app/test-pmd/cmdline.c
@@ -5491,6 +5491,12 @@ cmd_set_flush_rx_parsed(void *parsed_result,
 		__rte_unused void *data)
 {
 	struct cmd_set_flush_rx *res = parsed_result;
+
+	if (num_procs > 1 && (strcmp(res->mode, "on") == 0)) {
+		printf("multi-process doesn't support to flush Rx queues.\n");
+		return;
+	}
+
 	no_flush_rx = (uint8_t)((strcmp(res->mode, "on") == 0) ? 0 : 1);
 }
 
diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c
index 31d8ba1..bd404db 100644
--- a/app/test-pmd/config.c
+++ b/app/test-pmd/config.c
@@ -2998,6 +2998,8 @@ rss_fwd_config_setup(void)
 	queueid_t  rxq;
 	queueid_t  nb_q;
 	streamid_t  sm_id;
+	int start;
+	int end;
 
 	nb_q = nb_rxq;
 	if (nb_q > nb_txq)
@@ -3015,7 +3017,21 @@ rss_fwd_config_setup(void)
 	init_fwd_streams();
 
 	setup_fwd_config_of_each_lcore(&cur_fwd_config);
-	rxp = 0; rxq = 0;
+
+	if (proc_id > 0 && nb_q % num_procs != 0)
+		printf("Warning! queue numbers should be multiple of processes, or packet loss will happen.\n");
+
+	/**
+	 * In multi-process, All queues are allocated to different
+	 * processes based on num_procs and proc_id. For example:
+	 * if supports 4 queues(nb_q), 2 processes(num_procs),
+	 * the 0~1 queue for primary process.
+	 * the 2~3 queue for secondary process.
+	 */
+	start = proc_id * nb_q / num_procs;
+	end = start + nb_q / num_procs;
+	rxp = 0;
+	rxq = start;
 	for (sm_id = 0; sm_id < cur_fwd_config.nb_fwd_streams; sm_id++) {
 		struct fwd_stream *fs;
 
@@ -3032,6 +3048,8 @@ rss_fwd_config_setup(void)
 			continue;
 		rxp = 0;
 		rxq++;
+		if (rxq >= end)
+			rxq = start;
 	}
 }
 
diff --git a/app/test-pmd/parameters.c b/app/test-pmd/parameters.c
index 7c13210..26192f1 100644
--- a/app/test-pmd/parameters.c
+++ b/app/test-pmd/parameters.c
@@ -512,6 +512,9 @@ parse_link_speed(int n)
 void
 launch_args_parse(int argc, char** argv)
 {
+#define PARAM_PROC_ID "proc-id"
+#define PARAM_NUM_PROCS "num-procs"
+
 	int n, opt;
 	char **argvopt;
 	int opt_idx;
@@ -631,6 +634,8 @@ launch_args_parse(int argc, char** argv)
 		{ "rx-mq-mode",                 1, 0, 0 },
 		{ "record-core-cycles",         0, 0, 0 },
 		{ "record-burst-stats",         0, 0, 0 },
+		{ PARAM_NUM_PROCS,              1, 0, 0 },
+		{ PARAM_PROC_ID,                1, 0, 0 },
 		{ 0, 0, 0, 0 },
 	};
 
@@ -1397,6 +1402,10 @@ launch_args_parse(int argc, char** argv)
 				record_core_cycles = 1;
 			if (!strcmp(lgopts[opt_idx].name, "record-burst-stats"))
 				record_burst_stats = 1;
+			if (!strcmp(lgopts[opt_idx].name, PARAM_NUM_PROCS))
+				num_procs = atoi(optarg);
+			if (!strcmp(lgopts[opt_idx].name, PARAM_PROC_ID))
+				proc_id = atoi(optarg);
 			break;
 		case 'h':
 			usage(argv[0]);
diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
index 6cbe9ba..66bce4c 100644
--- a/app/test-pmd/testpmd.c
+++ b/app/test-pmd/testpmd.c
@@ -520,6 +520,62 @@ enum rte_eth_rx_mq_mode rx_mq_mode = ETH_MQ_RX_VMDQ_DCB_RSS;
  */
 uint32_t eth_link_speed;
 
+/*
+ * ID of the current process in multi-process, used to
+ * configure the queues to be polled.
+ */
+int proc_id;
+
+/*
+ * Number of processes in multi-process, used to
+ * configure the queues to be polled.
+ */
+unsigned int num_procs = 1;
+
+static int
+eth_dev_configure_mp(uint16_t port_id, uint16_t nb_rx_q, uint16_t nb_tx_q,
+		      const struct rte_eth_conf *dev_conf)
+{
+	if (is_proc_primary())
+		return rte_eth_dev_configure(port_id, nb_rx_q, nb_tx_q,
+					dev_conf);
+	return 0;
+}
+
+static int
+eth_dev_start_mp(uint16_t port_id)
+{
+	if (is_proc_primary())
+		return rte_eth_dev_start(port_id);
+
+	return 0;
+}
+
+static int
+eth_dev_stop_mp(uint16_t port_id)
+{
+	if (is_proc_primary())
+		return rte_eth_dev_stop(port_id);
+
+	return 0;
+}
+
+static void
+mempool_free_mp(struct rte_mempool *mp)
+{
+	if (is_proc_primary())
+		rte_mempool_free(mp);
+}
+
+static int
+eth_dev_set_mtu_mp(uint16_t port_id, uint16_t mtu)
+{
+	if (is_proc_primary())
+		return rte_eth_dev_set_mtu(port_id, mtu);
+
+	return 0;
+}
+
 /* Forward function declarations */
 static void setup_attached_port(portid_t pi);
 static void check_all_ports_link_status(uint32_t port_mask);
@@ -995,6 +1051,14 @@ mbuf_pool_create(uint16_t mbuf_seg_size, unsigned nb_mbuf,
 	mb_size = sizeof(struct rte_mbuf) + mbuf_seg_size;
 #endif
 	mbuf_poolname_build(socket_id, pool_name, sizeof(pool_name), size_idx);
+	if (!is_proc_primary()) {
+		rte_mp = rte_mempool_lookup(pool_name);
+		if (rte_mp == NULL)
+			rte_exit(EXIT_FAILURE,
+				"Get mbuf pool for socket %u failed: %s\n",
+				socket_id, rte_strerror(rte_errno));
+		return rte_mp;
+	}
 
 	TESTPMD_LOG(INFO,
 		"create a new mbuf pool <%s>: n=%u, size=%u, socket=%u\n",
@@ -1994,6 +2058,11 @@ flush_fwd_rx_queues(void)
 	uint64_t prev_tsc = 0, diff_tsc, cur_tsc, timer_tsc = 0;
 	uint64_t timer_period;
 
+	if (num_procs > 1) {
+		printf("multi-process not support for flushing fwd Rx queues, skip the below lines and return.\n");
+		return;
+	}
+
 	/* convert to number of cycles */
 	timer_period = rte_get_timer_hz(); /* 1 second timeout */
 
@@ -2483,7 +2552,7 @@ start_port(portid_t pid)
 				return -1;
 			}
 			/* configure port */
-			diag = rte_eth_dev_configure(pi, nb_rxq + nb_hairpinq,
+			diag = eth_dev_configure_mp(pi, nb_rxq + nb_hairpinq,
 						     nb_txq + nb_hairpinq,
 						     &(port->dev_conf));
 			if (diag != 0) {
@@ -2499,7 +2568,7 @@ start_port(portid_t pid)
 				return -1;
 			}
 		}
-		if (port->need_reconfig_queues > 0) {
+		if (port->need_reconfig_queues > 0 && is_proc_primary()) {
 			port->need_reconfig_queues = 0;
 			/* setup tx queues */
 			for (qi = 0; qi < nb_txq; qi++) {
@@ -2602,7 +2671,7 @@ start_port(portid_t pid)
 		cnt_pi++;
 
 		/* start port */
-		diag = rte_eth_dev_start(pi);
+		diag = eth_dev_start_mp(pi);
 		if (diag < 0) {
 			fprintf(stderr, "Fail to start port %d: %s\n",
 				pi, rte_strerror(-diag));
@@ -2745,7 +2814,7 @@ stop_port(portid_t pid)
 		if (port->flow_list)
 			port_flow_flush(pi);
 
-		if (rte_eth_dev_stop(pi) != 0)
+		if (eth_dev_stop_mp(pi) != 0)
 			RTE_LOG(ERR, EAL, "rte_eth_dev_stop failed for port %u\n",
 				pi);
 
@@ -2819,8 +2888,10 @@ close_port(portid_t pid)
 			continue;
 		}
 
-		port_flow_flush(pi);
-		rte_eth_dev_close(pi);
+		if (is_proc_primary()) {
+			port_flow_flush(pi);
+			rte_eth_dev_close(pi);
+		}
 	}
 
 	remove_invalid_ports();
@@ -3105,7 +3176,7 @@ pmd_test_exit(void)
 	}
 	for (i = 0 ; i < RTE_DIM(mempools) ; i++) {
 		if (mempools[i])
-			rte_mempool_free(mempools[i]);
+			mempool_free_mp(mempools[i]);
 	}
 
 	printf("\nBye...\n");
@@ -3446,7 +3517,7 @@ update_jumbo_frame_offload(portid_t portid)
 	 * if unset do it here
 	 */
 	if ((rx_offloads & DEV_RX_OFFLOAD_JUMBO_FRAME) == 0) {
-		ret = rte_eth_dev_set_mtu(portid,
+		ret = eth_dev_set_mtu_mp(portid,
 				port->dev_conf.rxmode.max_rx_pkt_len - eth_overhead);
 		if (ret)
 			fprintf(stderr,
@@ -3642,6 +3713,10 @@ init_port_dcb_config(portid_t pid,
 	int retval;
 	uint16_t i;
 
+	if (num_procs > 1) {
+		printf("The multi-process feature doesn't support dcb.\n");
+		return -ENOTSUP;
+	}
 	rte_port = &ports[pid];
 
 	memset(&port_conf, 0, sizeof(struct rte_eth_conf));
@@ -3811,10 +3886,6 @@ main(int argc, char** argv)
 		rte_exit(EXIT_FAILURE, "Cannot init EAL: %s\n",
 			 rte_strerror(rte_errno));
 
-	if (rte_eal_process_type() == RTE_PROC_SECONDARY)
-		rte_exit(EXIT_FAILURE,
-			 "Secondary process type not supported.\n");
-
 	ret = register_eth_event_callback();
 	if (ret != 0)
 		rte_exit(EXIT_FAILURE, "Cannot register for ethdev events");
diff --git a/app/test-pmd/testpmd.h b/app/test-pmd/testpmd.h
index 16a3598..04773c7 100644
--- a/app/test-pmd/testpmd.h
+++ b/app/test-pmd/testpmd.h
@@ -632,6 +632,15 @@ extern enum rte_eth_rx_mq_mode rx_mq_mode;
 
 extern struct rte_flow_action_conntrack conntrack_context;
 
+extern int proc_id;
+extern unsigned int num_procs;
+
+static inline bool
+is_proc_primary(void)
+{
+	return rte_eal_process_type() == RTE_PROC_PRIMARY;
+}
+
 static inline unsigned int
 lcore_num(void)
 {
diff --git a/doc/guides/rel_notes/release_21_11.rst b/doc/guides/rel_notes/release_21_11.rst
index d707a55..2a9d3b9 100644
--- a/doc/guides/rel_notes/release_21_11.rst
+++ b/doc/guides/rel_notes/release_21_11.rst
@@ -51,6 +51,10 @@ New Features
      * Other libs
      * Apps, Examples, Tools (if significant)
 
+	 * **Added support multi-process for testpmd.**
+       Added command-line options to specify total number of processes and
+       current process ID. Each process owns subset of Rx and Tx queues.
+
      This section is a comment. Do not overwrite or remove it.
      Also, make sure to start the actual text at the margin.
      =======================================================
diff --git a/doc/guides/testpmd_app_ug/run_app.rst b/doc/guides/testpmd_app_ug/run_app.rst
index 6061674..ebbe8d9 100644
--- a/doc/guides/testpmd_app_ug/run_app.rst
+++ b/doc/guides/testpmd_app_ug/run_app.rst
@@ -545,3 +545,87 @@ The command line options are:
 	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:
+
+*   primary process:
+
+.. code-block:: console
+
+    sudo ./dpdk-testpmd -a xxx --proc-type=auto -l 0-1 -- -i --rxq=4 --txq=4 \
+        --num-procs=2 --proc-id=0
+
+*   secondary process:
+
+.. code-block:: console
+
+    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:
+
+*   ``--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 testpmd is configured to have 4 Tx and Rx queues,
+queues 0 and 1 will be used by the primary process and
+queues 2 and 3 will be used by the secondary process.
+
+The number of queues should be a multiple of the number of processes. If not,
+redundant queues will exist after queues are allocated to processes. If RSS
+is enabled, packet loss occurs when traffic is sent to all processes at the same
+time. Some traffic goes to 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:
+
+.. code-block:: console
+
+    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.
+
+When secondary is running, port in primary is not permitted to be stopped.
+Reconfigure operation is only valid in primary.
+
+Stats is supported, stats will not change when one quits and starts, 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 the testpmd primary process receiving or transmitting packets from the
+queue allocated for secondary process is not permitted, and same for secondary
+process.
+
+Flow API and RSS are supported.
-- 
2.7.4