[dpdk-dev] [PATCH 14/20] eventdev: add default conf for Rx adapter conf

[Anoob Joseph <anoob.joseph@caviumnetworks.com>]

Generate a default conf for Rx adapter, if not specified in the conf.
This routine will check the available eth ports and event queues, and
maps them 1:1. So one eth port will be connected to one event queue.
This way, event queue ID could be used to figure out the port on which
the packet came in.

Signed-off-by: Anoob Joseph <anoob.joseph@caviumnetworks.com>
---
 lib/librte_eventdev/rte_eventmode_helper.c         | 127 +++++++++++++++++++++
 .../rte_eventmode_helper_internal.h                |   4 +
 2 files changed, 131 insertions(+)

diff --git a/lib/librte_eventdev/rte_eventmode_helper.c b/lib/librte_eventdev/rte_eventmode_helper.c
index 4d6888c..bec893c 100644
--- a/lib/librte_eventdev/rte_eventmode_helper.c
+++ b/lib/librte_eventdev/rte_eventmode_helper.c
@@ -65,6 +65,29 @@ internal_get_eventdev_params(struct eventmode_conf *em_conf,
 	return &(em_conf->eventdev_config[i]);
 }
 
+static inline unsigned
+internal_get_next_rx_core(struct eventmode_conf *em_conf, unsigned prev_core)
+{
+	unsigned next_core;
+
+get_next_core:
+	/* Get the next core */
+	next_core = rte_get_next_lcore(prev_core, 0, 0);
+
+	/* Check if we have reached max lcores */
+	if (next_core == RTE_MAX_LCORE)
+		return next_core;
+
+	/* Only some cores would be marked as rx cores. Skip others */
+	if (!(em_conf->rx_core_mask & (1 << next_core))) {
+		prev_core = next_core;
+		goto get_next_core;
+	}
+
+	return next_core;
+}
+
+
 /* Global functions */
 
 void
@@ -105,6 +128,7 @@ static void
 em_initialize_helper_conf(struct rte_eventmode_helper_conf *conf)
 {
 	struct eventmode_conf *em_conf = NULL;
+	unsigned rx_core_id;
 
 	/* Set default conf */
 
@@ -119,6 +143,13 @@ em_initialize_helper_conf(struct rte_eventmode_helper_conf *conf)
 
 	/* Stage 1 schedule type: atomic */
 	em_conf->ext_params.s1_sched_type = RTE_SCHED_TYPE_ATOMIC;
+
+	/* Set rx core. Use first core other than master core as Rx core */
+	rx_core_id = rte_get_next_lcore(0, /* curr core */
+					1, /* skip master core */
+					0  /* wrap */);
+
+	em_conf->rx_core_mask = (1 << rx_core_id);
 }
 
 struct rte_eventmode_helper_conf *
@@ -253,6 +284,89 @@ rte_eventmode_helper_set_default_conf_eventdev(struct eventmode_conf *em_conf)
 }
 
 static int
+rte_eventmode_helper_set_default_conf_adapter(struct eventmode_conf *em_conf)
+{
+	int nb_eth_dev;
+	int i;
+	int adapter_id;
+	int eventdev_id;
+	int conn_id;
+	struct rx_adapter_conf *adapter;
+	struct adapter_connection_info *conn;
+	struct eventdev_params *eventdev_config;
+
+	/* Create one adapter with all eth queues mapped to event queues 1:1 */
+
+	if (em_conf->nb_eventdev == 0) {
+		RTE_EM_HLPR_LOG_ERR("No event devs registered");
+		return -1;
+	}
+
+	/* Get the number of eth devs */
+	nb_eth_dev = rte_eth_dev_count_avail();
+
+	/* Use the first event dev */
+	eventdev_config = &(em_conf->eventdev_config[0]);
+
+	/* Get eventdev ID */
+	eventdev_id = eventdev_config->eventdev_id;
+	adapter_id = 0;
+
+	/* Get adapter conf */
+	adapter = &(em_conf->adapter[adapter_id]);
+
+	/* Set adapter conf */
+	adapter->eventdev_id = eventdev_id;
+	adapter->adapter_id = adapter_id;
+	adapter->rx_core_id = internal_get_next_rx_core(em_conf, -1);
+
+	/*
+	 * All queues of one eth device (port) will be mapped to one event
+	 * queue. Each port will have an individual connection.
+	 *
+	 */
+
+	/* Make sure there is enough event queues for 1:1 mapping */
+	if (nb_eth_dev > eventdev_config->nb_eventqueue) {
+		RTE_EM_HLPR_LOG_ERR(
+			"Not enough event queues for 1:1 mapping "
+			"[eth devs: %d, event queues: %d]\n",
+			nb_eth_dev,
+			eventdev_config->nb_eventqueue);
+		return -1;
+	}
+
+	for (i = 0; i < nb_eth_dev; i++) {
+
+		/* Use only the ports enabled */
+		if ((em_conf->eth_portmask & (1 << i)) == 0)
+			continue;
+
+		/* Get the connection id */
+		conn_id = adapter->nb_connections;
+
+		/* Get the connection */
+		conn = &(adapter->conn[conn_id]);
+
+		/* Set 1:1 mapping between eth ports & event queues*/
+		conn->ethdev_id = i;
+		conn->eventq_id = i;
+
+		/* Add all eth queues of one eth port to one event queue */
+		conn->ethdev_rx_qid = -1;
+
+		/* Update no of connections */
+		adapter->nb_connections++;
+
+	}
+
+	/* We have setup one adapter */
+	em_conf->nb_rx_adapter = 1;
+
+	return 0;
+}
+
+static int
 rte_eventmode_helper_validate_conf(struct eventmode_conf *em_conf)
 {
 	int ret;
@@ -272,6 +386,16 @@ rte_eventmode_helper_validate_conf(struct eventmode_conf *em_conf)
 			return ret;
 	}
 
+	/*
+	 * See if adapters are specified. Else generate a default conf
+	 * with one adapter and all eth queue - event queue mapped.
+	 */
+	if (em_conf->nb_rx_adapter == 0) {
+		ret = rte_eventmode_helper_set_default_conf_adapter(em_conf);
+		if (ret != 0)
+			return ret;
+	}
+
 	return 0;
 }
 
@@ -591,6 +715,9 @@ rte_eventmode_helper_initialize_devs(
 	/* Get eventmode conf */
 	em_conf = (struct eventmode_conf *)(mode_conf->mode_params);
 
+	/* Eventmode conf would need eth portmask */
+	em_conf->eth_portmask = mode_conf->eth_portmask;
+
 	/* Validate the conf requested */
 	if (rte_eventmode_helper_validate_conf(em_conf) != 0) {
 		RTE_EM_HLPR_LOG_ERR(
diff --git a/lib/librte_eventdev/rte_eventmode_helper_internal.h b/lib/librte_eventdev/rte_eventmode_helper_internal.h
index 63b2fb5..9db9684 100644
--- a/lib/librte_eventdev/rte_eventmode_helper_internal.h
+++ b/lib/librte_eventdev/rte_eventmode_helper_internal.h
@@ -83,6 +83,10 @@ struct eventmode_conf {
 	struct rte_eventmode_helper_event_link_info
 			link[EVENT_MODE_MAX_LCORE_LINKS];
 		/**< Per link conf */
+	uint32_t rx_core_mask;
+		/**< Core mask of rx cores to be used */
+	uint32_t eth_portmask;
+		/**< Mask of the eth ports to be used */
 	union {
 		struct {
 			uint64_t s1_sched_type			: 2;
-- 
2.7.4