[RFC 2/5] ethdev: introduce the affinity field in Tx queue API

[Jiawei Wang <jiaweiw@nvidia.com>]

For the multiple hardware ports connect to a single DPDK port (mhpsdp),
the previous patch introduces the new rte flow item to match the port
affinity of the received packets.

This patch adds the tx_affinity setting in Tx queue API, the affinity value
reflects packets be sent to which hardware port.

Adds the new tx_affinity field into the padding hole of rte_eth_txconf
structure, the size of rte_eth_txconf keeps the same. Adds a suppress
type for structure change in the ABI check file.

This patch adds the testpmd command line:
testpmd> port config (port_id) txq (queue_id) affinity (value)

For example, there're two hardware ports connects to a single DPDK
port (port id 0), and affinity 1 stood for hard port 1 and affinity
2 stood for hardware port 2, used the below command to config
tx affinity for each TxQ:
	port config 0 txq 0 affinity 1
	port config 0 txq 1 affinity 1
	port config 0 txq 2 affinity 2
	port config 0 txq 3 affinity 2

These commands config the TxQ index 0 and TxQ index 1 with affinity 1,
uses TxQ 0 or TxQ 1 send packets, these packets will be sent from the
hardware port 1, and similar with hardware port 2 if sending packets
with TxQ 2 or TxQ 3.

Signed-off-by: Jiawei Wang <jiaweiw@nvidia.com>
---
 app/test-pmd/cmdline.c                      | 84 +++++++++++++++++++++
 devtools/libabigail.abignore                |  5 ++
 doc/guides/rel_notes/release_22_03.rst      |  4 +
 doc/guides/testpmd_app_ug/testpmd_funcs.rst | 13 ++++
 lib/ethdev/rte_ethdev.h                     |  1 +
 5 files changed, 107 insertions(+)

diff --git a/app/test-pmd/cmdline.c b/app/test-pmd/cmdline.c
index b32dc8bfd4..683cae1cab 100644
--- a/app/test-pmd/cmdline.c
+++ b/app/test-pmd/cmdline.c
@@ -764,6 +764,10 @@ static void cmd_help_long_parsed(void *parsed_result,
 
 			"port cleanup (port_id) txq (queue_id) (free_cnt)\n"
 			"    Cleanup txq mbufs for a specific Tx queue\n\n"
+
+			"port config <port_id> txq <queue_id> affinity <value>\n"
+			"    Set the port affinity value "
+			"on a specific Tx queue\n\n"
 		);
 	}
 
@@ -12621,6 +12625,85 @@ static cmdline_parse_inst_t cmd_show_port_flow_transfer_proxy = {
 	}
 };
 
+/* *** configure port txq affinity value *** */
+struct cmd_config_tx_affinity {
+	cmdline_fixed_string_t port;
+	cmdline_fixed_string_t config;
+	portid_t portid;
+	cmdline_fixed_string_t txq;
+	uint16_t qid;
+	cmdline_fixed_string_t affinity;
+	uint16_t value;
+};
+
+static void
+cmd_config_tx_affinity_parsed(void *parsed_result,
+				__rte_unused struct cmdline *cl,
+				 __rte_unused void *data)
+{
+	struct cmd_config_tx_affinity *res = parsed_result;
+	struct rte_port *port;
+
+	if (port_id_is_invalid(res->portid, ENABLED_WARN))
+		return;
+
+	if (res->portid == (portid_t)RTE_PORT_ALL) {
+		printf("Invalid port id\n");
+		return;
+	}
+
+	port = &ports[res->portid];
+
+	if (strcmp(res->txq, "txq")) {
+		printf("Unknown parameter\n");
+		return;
+	}
+	if (tx_queue_id_is_invalid(res->qid))
+		return;
+
+	port->txq[res->qid].conf.tx_affinity = res->value;
+
+	cmd_reconfig_device_queue(res->portid, 0, 1);
+}
+
+cmdline_parse_token_string_t cmd_config_tx_affinity_port =
+	TOKEN_STRING_INITIALIZER(struct cmd_config_tx_affinity,
+				 port, "port");
+cmdline_parse_token_string_t cmd_config_tx_affinity_config =
+	TOKEN_STRING_INITIALIZER(struct cmd_config_tx_affinity,
+				 config, "config");
+cmdline_parse_token_num_t cmd_config_tx_affinity_portid =
+	TOKEN_NUM_INITIALIZER(struct cmd_config_tx_affinity,
+				 portid, RTE_UINT16);
+cmdline_parse_token_string_t cmd_config_tx_affinity_txq =
+	TOKEN_STRING_INITIALIZER(struct cmd_config_tx_affinity,
+				 txq, "txq");
+cmdline_parse_token_num_t cmd_config_tx_affinity_qid =
+	TOKEN_NUM_INITIALIZER(struct cmd_config_tx_affinity,
+			      qid, RTE_UINT16);
+cmdline_parse_token_string_t cmd_config_tx_affinity_affine =
+	TOKEN_STRING_INITIALIZER(struct cmd_config_tx_affinity,
+				 affinity, "affinity");
+cmdline_parse_token_num_t cmd_config_tx_affinity_value =
+	TOKEN_NUM_INITIALIZER(struct cmd_config_tx_affinity,
+			      value, RTE_UINT16);
+
+static cmdline_parse_inst_t cmd_config_tx_affinity = {
+	.f = cmd_config_tx_affinity_parsed,
+	.data = (void *)0,
+	.help_str = "port config <port_id> txq <queue_id> affinity <value>",
+	.tokens = {
+		(void *)&cmd_config_tx_affinity_port,
+		(void *)&cmd_config_tx_affinity_config,
+		(void *)&cmd_config_tx_affinity_portid,
+		(void *)&cmd_config_tx_affinity_txq,
+		(void *)&cmd_config_tx_affinity_qid,
+		(void *)&cmd_config_tx_affinity_affine,
+		(void *)&cmd_config_tx_affinity_value,
+		NULL,
+	},
+};
+
 /* ******************************************************************************** */
 
 /* list of instructions */
@@ -12851,6 +12934,7 @@ static cmdline_parse_ctx_t builtin_ctx[] = {
 	(cmdline_parse_inst_t *)&cmd_show_capability,
 	(cmdline_parse_inst_t *)&cmd_set_flex_is_pattern,
 	(cmdline_parse_inst_t *)&cmd_set_flex_spec_pattern,
+	(cmdline_parse_inst_t *)&cmd_config_tx_affinity,
 	NULL,
 };
 
diff --git a/devtools/libabigail.abignore b/devtools/libabigail.abignore
index 7a93de3ba1..cbbde4ef05 100644
--- a/devtools/libabigail.abignore
+++ b/devtools/libabigail.abignore
@@ -20,6 +20,11 @@
 [suppress_file]
         soname_regexp = ^librte_.*mlx.*glue\.
 
+; Ignore fields inserted in middle padding of rte_eth_txconf
+[suppress_type]
+        name = rte_eth_txconf
+        has_data_member_inserted_between = {offset_after(tx_deferred_start), offset_of(offloads)}
+
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ; Experimental APIs exceptions ;
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
diff --git a/doc/guides/rel_notes/release_22_03.rst b/doc/guides/rel_notes/release_22_03.rst
index 8acd3174f6..0d81ae7bc3 100644
--- a/doc/guides/rel_notes/release_22_03.rst
+++ b/doc/guides/rel_notes/release_22_03.rst
@@ -212,6 +212,10 @@ API Changes
 * ethdev: Old public macros and enumeration constants without ``RTE_ETH_`` prefix,
   which are kept for backward compatibility, are marked as deprecated.
 
+* ethdev: added a new field:
+
+  - Tx affinity per-queue ``rte_eth_txconf.tx_affinity``
+
 * cryptodev: The asymmetric session handling was modified to use a single
   mempool object. An API ``rte_cryptodev_asym_session_pool_create`` was added
   to create a mempool with element size big enough to hold the generic asymmetric
diff --git a/doc/guides/testpmd_app_ug/testpmd_funcs.rst b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
index c0ace56c1f..0c3317ee06 100644
--- a/doc/guides/testpmd_app_ug/testpmd_funcs.rst
+++ b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
@@ -1605,6 +1605,19 @@ Enable or disable a per queue Tx offloading only on a specific Tx queue::
 
 This command should be run when the port is stopped, or else it will fail.
 
+config per queue Tx affinity
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Configure a affinity value per queue Tx offloading only on a specific Tx queue::
+
+   testpmd> port (port_id) txq (queue_id) affinity (value)
+
+* ``affinity``: reflects packet can be sent to which hardware port.
+                uses it on multiple hardware ports connect to
+                a single DPDK port (mhpsdp).
+
+This command should be run when the port is stopped, or else it will fail.
+
 Config VXLAN Encap outer layers
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
diff --git a/lib/ethdev/rte_ethdev.h b/lib/ethdev/rte_ethdev.h
index 882ca585f2..813dbb34b5 100644
--- a/lib/ethdev/rte_ethdev.h
+++ b/lib/ethdev/rte_ethdev.h
@@ -1138,6 +1138,7 @@ struct rte_eth_txconf {
 				      less free descriptors than this value. */
 
 	uint8_t tx_deferred_start; /**< Do not start queue with rte_eth_dev_start(). */
+	uint8_t tx_affinity; /**< Drives the setting of affinity per-queue. */
 	/**
 	 * Per-queue Tx offloads to be set  using RTE_ETH_TX_OFFLOAD_* flags.
 	 * Only offloads set on tx_queue_offload_capa or tx_offload_capa
-- 
2.18.1