[dpdk-dev] [PATCH v2] app/testpmd: add support for forced ethernet speed

[Ajit Khaparde <ajit.khaparde@broadcom.com>]

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Add support for forced ethernet speed setting.
Currently testpmd tries to configure the Ethernet port in autoneg mode.
It is not possible to set the Ethernet port to a specific speed while
starting testpmd. In some cases capability to configure a forced speed
for the Ethernet port during initialization may be necessary. This patch
tries to add this support.

The patch assumes full duplex setting and does not attempt to change that.
So speeds like 10M, 100M are not configurable using this method.

The command line to configure a forced speed of 10G:
dpdk-testpmd -c 0xff  -- -i  --eth-link-speed  10000

The command line to configure a forced speed of 50G:
dpdk-testpmd -c 0xff  -- -i  --eth-link-speed  50000

Signed-off-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
----
v1->v2:
 - Updated the release notes to document the new parameter.
 - Updated the user guide to indicate 10 and 100 Mbps are not supported.
 - Check and return error if 10 or 100Mbps speeds are requested.
 - Set ETH_LINK_SPEED_FIXED when requesting forced link speed.
 - Updated code based on other review comments.

Please apply.
---
 app/test-pmd/parameters.c              | 44 ++++++++++++++++++++++++++
 app/test-pmd/testpmd.c                 |  8 +++++
 app/test-pmd/testpmd.h                 |  1 +
 doc/guides/rel_notes/release_21_05.rst |  3 ++
 doc/guides/testpmd_app_ug/run_app.rst  | 16 ++++++++++
 5 files changed, 72 insertions(+)

diff --git a/app/test-pmd/parameters.c b/app/test-pmd/parameters.c
index c8acd5d1b7..c5dac33b0f 100644
--- a/app/test-pmd/parameters.c
+++ b/app/test-pmd/parameters.c
@@ -224,6 +224,7 @@ usage(char* progname)
 	printf("  --hairpin-mode=0xXX: bitmask set the hairpin port mode.\n "
 	       "    0x10 - explicit Tx rule, 0x02 - hairpin ports paired\n"
 	       "    0x01 - hairpin ports loop, 0x00 - hairpin port self\n");
+	printf("  --eth-link-speed: forced link speed.\n");
 }
 
 #ifdef RTE_LIB_CMDLINE
@@ -485,6 +486,43 @@ parse_event_printing_config(const char *optarg, int enable)
 	return 0;
 }
 
+static int
+parse_link_speed(int n)
+{
+	uint32_t speed = ETH_LINK_SPEED_FIXED;
+
+	switch (n) {
+	case 1000:
+		speed |= ETH_LINK_SPEED_1G;
+		break;
+	case 10000:
+		speed |= ETH_LINK_SPEED_10G;
+		break;
+	case 25000:
+		speed |= ETH_LINK_SPEED_25G;
+		break;
+	case 40000:
+		speed |= ETH_LINK_SPEED_40G;
+		break;
+	case 50000:
+		speed |= ETH_LINK_SPEED_50G;
+		break;
+	case 100000:
+		speed |= ETH_LINK_SPEED_100G;
+		break;
+	case 200000:
+		speed |= ETH_LINK_SPEED_200G;
+		break;
+	case 100:
+	case 10:
+	default:
+		printf("Unsupported fixed speed\n");
+		return 0;
+	}
+
+	return speed;
+}
+
 void
 launch_args_parse(int argc, char** argv)
 {
@@ -605,6 +643,7 @@ 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 },
+		{ "eth-link-speed",		1, 0, 0 },
 		{ 0, 0, 0, 0 },
 	};
 
@@ -1366,6 +1405,11 @@ 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, "eth-link-speed")) {
+				n = atoi(optarg);
+				if (n >= 0 && parse_link_speed(n) > 0)
+					eth_link_speed = parse_link_speed(n);
+			}
 			break;
 		case 'h':
 			usage(argv[0]);
diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
index 1a57324b1b..98c3248c01 100644
--- a/app/test-pmd/testpmd.c
+++ b/app/test-pmd/testpmd.c
@@ -513,6 +513,11 @@ uint8_t gro_flush_cycles = GRO_DEFAULT_FLUSH_CYCLES;
  */
 enum rte_eth_rx_mq_mode rx_mq_mode = ETH_MQ_RX_VMDQ_DCB_RSS;
 
+/*
+ * Used to set forced link speed
+ */
+uint32_t eth_link_speed;
+
 /* Forward function declarations */
 static void setup_attached_port(portid_t pi);
 static void check_all_ports_link_status(uint32_t port_mask);
@@ -1484,6 +1489,9 @@ init_config(void)
 			port->tx_conf[k].offloads =
 				port->dev_conf.txmode.offloads;
 
+		if (eth_link_speed)
+			port->dev_conf.link_speeds = eth_link_speed;
+
 		/* set flag to initialize port/queue */
 		port->need_reconfig = 1;
 		port->need_reconfig_queues = 1;
diff --git a/app/test-pmd/testpmd.h b/app/test-pmd/testpmd.h
index ce83f31f0d..0f54bcc346 100644
--- a/app/test-pmd/testpmd.h
+++ b/app/test-pmd/testpmd.h
@@ -353,6 +353,7 @@ extern bool setup_on_probe_event; /**< disabled by port setup-on iterator */
 extern uint8_t hot_plug; /**< enable by "--hot-plug" parameter */
 extern int do_mlockall; /**< set by "--mlockall" or "--no-mlockall" parameter */
 extern uint8_t clear_ptypes; /**< disabled by set ptype cmd */
+extern uint32_t eth_link_speed;
 
 #ifdef RTE_LIBRTE_IXGBE_BYPASS
 extern uint32_t bypass_timeout; /**< Store the NIC bypass watchdog timeout */
diff --git a/doc/guides/rel_notes/release_21_05.rst b/doc/guides/rel_notes/release_21_05.rst
index ca28d05d59..dde652dddf 100644
--- a/doc/guides/rel_notes/release_21_05.rst
+++ b/doc/guides/rel_notes/release_21_05.rst
@@ -64,6 +64,9 @@ New Features
   * Added command to display Rx queue used descriptor count.
     ``show port (port_id) rxq (queue_id) desc used count``
 
+  * Added a command line option to configure forced speed for Ethernet port.
+    ``dpdk-testpmd -c 0xff  -- -i  --eth-link-speed N``
+
 
 Removed Items
 -------------
diff --git a/doc/guides/testpmd_app_ug/run_app.rst b/doc/guides/testpmd_app_ug/run_app.rst
index 6745072329..2abff3019a 100644
--- a/doc/guides/testpmd_app_ug/run_app.rst
+++ b/doc/guides/testpmd_app_ug/run_app.rst
@@ -536,3 +536,19 @@ 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.
+
+*   ``--eth-link-speed``
+
+    Set a forced link speed to the ethernet port.
+    1000 - 1Gbps
+    10000 - 10Gbps
+    25000 - 25Gbps
+    40000 - 40Gbps
+    50000 - 50Gbps
+    100000 - 100Gbps
+    200000 - 200Gbps
+    ...
+
+.. Note::
+
+   Setting 10Mbps and 100Mbps speeds is not supported.
-- 
2.21.1 (Apple Git-122.3)