[PATCH v3 12/13] net/ionic: optimize device stop operation

[Andrew Boyer <andrew.boyer@amd.com>]

Split the queue_stop operation into first-half and second-half helpers.
Move the command context from the stack into each Rx/Tx queue struct.
Expose some needed adminq interfaces.

This allows us to batch up the queue commands during dev_stop(), reducing
the outage window when restarting the process by about 1ms per queue.

Signed-off-by: Andrew Boyer <andrew.boyer@amd.com>
---
 drivers/net/ionic/ionic.h      |  3 ++
 drivers/net/ionic/ionic_lif.c  | 68 ++++++++++++++++++++++-------
 drivers/net/ionic/ionic_lif.h  | 12 ++++--
 drivers/net/ionic/ionic_main.c | 17 +++++++-
 drivers/net/ionic/ionic_rxtx.c | 78 ++++++++++++++++++++--------------
 drivers/net/ionic/ionic_rxtx.h | 14 +++++-
 6 files changed, 138 insertions(+), 54 deletions(-)

diff --git a/drivers/net/ionic/ionic.h b/drivers/net/ionic/ionic.h
index c479eaba74..cb4ea450a9 100644
--- a/drivers/net/ionic/ionic.h
+++ b/drivers/net/ionic/ionic.h
@@ -83,7 +83,10 @@ struct ionic_admin_ctx {
 	union ionic_adminq_comp comp;
 };
 
+int ionic_adminq_post(struct ionic_lif *lif, struct ionic_admin_ctx *ctx);
 int ionic_adminq_post_wait(struct ionic_lif *lif, struct ionic_admin_ctx *ctx);
+int ionic_adminq_wait(struct ionic_lif *lif, struct ionic_admin_ctx *ctx);
+uint16_t ionic_adminq_space_avail(struct ionic_lif *lif);
 
 int ionic_dev_cmd_wait_check(struct ionic_dev *idev, unsigned long max_wait);
 int ionic_setup(struct ionic_adapter *adapter);
diff --git a/drivers/net/ionic/ionic_lif.c b/drivers/net/ionic/ionic_lif.c
index 90efcc8cbb..45317590fa 100644
--- a/drivers/net/ionic/ionic_lif.c
+++ b/drivers/net/ionic/ionic_lif.c
@@ -31,11 +31,15 @@ static int ionic_lif_addr_add(struct ionic_lif *lif, const uint8_t *addr);
 static int ionic_lif_addr_del(struct ionic_lif *lif, const uint8_t *addr);
 
 static int
-ionic_qcq_disable(struct ionic_qcq *qcq)
+ionic_qcq_disable_nowait(struct ionic_qcq *qcq,
+		struct ionic_admin_ctx *ctx)
 {
+	int err;
+
 	struct ionic_queue *q = &qcq->q;
 	struct ionic_lif *lif = qcq->lif;
-	struct ionic_admin_ctx ctx = {
+
+	*ctx = (struct ionic_admin_ctx) {
 		.pending_work = true,
 		.cmd.q_control = {
 			.opcode = IONIC_CMD_Q_CONTROL,
@@ -45,28 +49,39 @@ ionic_qcq_disable(struct ionic_qcq *qcq)
 		},
 	};
 
-	return ionic_adminq_post_wait(lif, &ctx);
+	/* Does not wait for command completion */
+	err = ionic_adminq_post(lif, ctx);
+	if (err)
+		ctx->pending_work = false;
+	return err;
 }
 
 void
 ionic_lif_stop(struct ionic_lif *lif)
 {
-	uint32_t i;
+	struct rte_eth_dev *dev = lif->eth_dev;
+	uint32_t i, j, chunk;
 
 	IONIC_PRINT_CALL();
 
 	lif->state &= ~IONIC_LIF_F_UP;
 
-	for (i = 0; i < lif->nrxqcqs; i++) {
-		struct ionic_rx_qcq *rxq = lif->rxqcqs[i];
-		if (rxq->flags & IONIC_QCQ_F_INITED)
-			(void)ionic_dev_rx_queue_stop(lif->eth_dev, i);
+	chunk = ionic_adminq_space_avail(lif);
+
+	for (i = 0; i < lif->nrxqcqs; i += chunk) {
+		for (j = 0; j < chunk && i + j < lif->nrxqcqs; j++)
+			ionic_dev_rx_queue_stop_firsthalf(dev, i + j);
+
+		for (j = 0; j < chunk && i + j < lif->nrxqcqs; j++)
+			ionic_dev_rx_queue_stop_secondhalf(dev, i + j);
 	}
 
-	for (i = 0; i < lif->ntxqcqs; i++) {
-		struct ionic_tx_qcq *txq = lif->txqcqs[i];
-		if (txq->flags & IONIC_QCQ_F_INITED)
-			(void)ionic_dev_tx_queue_stop(lif->eth_dev, i);
+	for (i = 0; i < lif->ntxqcqs; i += chunk) {
+		for (j = 0; j < chunk && i + j < lif->ntxqcqs; j++)
+			ionic_dev_tx_queue_stop_firsthalf(dev, i + j);
+
+		for (j = 0; j < chunk && i + j < lif->ntxqcqs; j++)
+			ionic_dev_tx_queue_stop_secondhalf(dev, i + j);
 	}
 }
 
@@ -1240,21 +1255,42 @@ ionic_lif_rss_teardown(struct ionic_lif *lif)
 }
 
 void
-ionic_lif_txq_deinit(struct ionic_tx_qcq *txq)
+ionic_lif_txq_deinit_nowait(struct ionic_tx_qcq *txq)
 {
-	ionic_qcq_disable(&txq->qcq);
+	ionic_qcq_disable_nowait(&txq->qcq, &txq->admin_ctx);
 
 	txq->flags &= ~IONIC_QCQ_F_INITED;
 }
 
 void
-ionic_lif_rxq_deinit(struct ionic_rx_qcq *rxq)
+ionic_lif_txq_stats(struct ionic_tx_qcq *txq)
+{
+	struct ionic_tx_stats *stats = &txq->stats;
+
+	IONIC_PRINT(DEBUG, "TX queue %u pkts %ju tso %ju",
+		txq->qcq.q.index, stats->packets, stats->tso);
+	IONIC_PRINT(DEBUG, "TX queue %u comps %ju (%ju per)",
+		txq->qcq.q.index, stats->comps,
+		stats->comps ? stats->packets / stats->comps : 0);
+}
+
+void
+ionic_lif_rxq_deinit_nowait(struct ionic_rx_qcq *rxq)
 {
-	ionic_qcq_disable(&rxq->qcq);
+	ionic_qcq_disable_nowait(&rxq->qcq, &rxq->admin_ctx);
 
 	rxq->flags &= ~IONIC_QCQ_F_INITED;
 }
 
+void
+ionic_lif_rxq_stats(struct ionic_rx_qcq *rxq)
+{
+	struct ionic_rx_stats *stats = &rxq->stats;
+
+	IONIC_PRINT(DEBUG, "RX queue %u pkts %ju mtod %ju",
+		rxq->qcq.q.index, stats->packets, stats->mtods);
+}
+
 static void
 ionic_lif_adminq_deinit(struct ionic_lif *lif)
 {
diff --git a/drivers/net/ionic/ionic_lif.h b/drivers/net/ionic/ionic_lif.h
index cac7a4583b..ee13f5b7c8 100644
--- a/drivers/net/ionic/ionic_lif.h
+++ b/drivers/net/ionic/ionic_lif.h
@@ -10,7 +10,7 @@
 #include <rte_ethdev.h>
 #include <rte_ether.h>
 
-#include "ionic_osdep.h"
+#include "ionic.h"
 #include "ionic_dev.h"
 #include "ionic_rx_filter.h"
 
@@ -99,6 +99,8 @@ struct ionic_rx_qcq {
 
 	/* cacheline4+ */
 	struct rte_mbuf *mbs[IONIC_MBUF_BULK_ALLOC] __rte_cache_aligned;
+
+	struct ionic_admin_ctx admin_ctx;
 };
 
 struct ionic_tx_qcq {
@@ -112,6 +114,8 @@ struct ionic_tx_qcq {
 	uint16_t flags;
 
 	struct ionic_tx_stats stats;
+
+	struct ionic_admin_ctx admin_ctx;
 };
 
 #define IONIC_Q_TO_QCQ(_q)	container_of(_q, struct ionic_qcq, q)
@@ -225,10 +229,12 @@ int ionic_tx_qcq_alloc(struct ionic_lif *lif, uint32_t socket_id,
 void ionic_qcq_free(struct ionic_qcq *qcq);
 
 int ionic_lif_rxq_init(struct ionic_rx_qcq *rxq);
-void ionic_lif_rxq_deinit(struct ionic_rx_qcq *rxq);
+void ionic_lif_rxq_deinit_nowait(struct ionic_rx_qcq *rxq);
+void ionic_lif_rxq_stats(struct ionic_rx_qcq *rxq);
 
 int ionic_lif_txq_init(struct ionic_tx_qcq *txq);
-void ionic_lif_txq_deinit(struct ionic_tx_qcq *txq);
+void ionic_lif_txq_deinit_nowait(struct ionic_tx_qcq *txq);
+void ionic_lif_txq_stats(struct ionic_tx_qcq *txq);
 
 int ionic_lif_rss_config(struct ionic_lif *lif, const uint16_t types,
 	const uint8_t *key, const uint32_t *indir);
diff --git a/drivers/net/ionic/ionic_main.c b/drivers/net/ionic/ionic_main.c
index c957d55bf9..1f24f64a33 100644
--- a/drivers/net/ionic/ionic_main.c
+++ b/drivers/net/ionic/ionic_main.c
@@ -180,6 +180,12 @@ ionic_adminq_service(struct ionic_cq *cq, uint16_t cq_desc_index,
 	return true;
 }
 
+uint16_t
+ionic_adminq_space_avail(struct ionic_lif *lif)
+{
+	return ionic_q_space_avail(&lif->adminqcq->qcq.q);
+}
+
 /** ionic_adminq_post - Post an admin command.
  * @lif:                Handle to lif.
  * @cmd_ctx:            Api admin command context.
@@ -191,7 +197,7 @@ ionic_adminq_service(struct ionic_cq *cq, uint16_t cq_desc_index,
  *
  * Return: zero or negative error status.
  */
-static int
+int
 ionic_adminq_post(struct ionic_lif *lif, struct ionic_admin_ctx *ctx)
 {
 	struct ionic_queue *q = &lif->adminqcq->qcq.q;
@@ -279,7 +285,6 @@ ionic_adminq_wait_for_completion(struct ionic_lif *lif,
 int
 ionic_adminq_post_wait(struct ionic_lif *lif, struct ionic_admin_ctx *ctx)
 {
-	bool done;
 	int err;
 
 	IONIC_PRINT(DEBUG, "Sending %s (%d) via the admin queue",
@@ -292,6 +297,14 @@ ionic_adminq_post_wait(struct ionic_lif *lif, struct ionic_admin_ctx *ctx)
 		return err;
 	}
 
+	return ionic_adminq_wait(lif, ctx);
+}
+
+int
+ionic_adminq_wait(struct ionic_lif *lif, struct ionic_admin_ctx *ctx)
+{
+	bool done;
+
 	done = ionic_adminq_wait_for_completion(lif, ctx,
 		IONIC_DEVCMD_TIMEOUT);
 
diff --git a/drivers/net/ionic/ionic_rxtx.c b/drivers/net/ionic/ionic_rxtx.c
index d92fa1cca7..774dc596c0 100644
--- a/drivers/net/ionic/ionic_rxtx.c
+++ b/drivers/net/ionic/ionic_rxtx.c
@@ -92,36 +92,40 @@ ionic_dev_tx_queue_release(struct rte_eth_dev *dev, uint16_t qid)
 }
 
 int __rte_cold
-ionic_dev_tx_queue_stop(struct rte_eth_dev *eth_dev, uint16_t tx_queue_id)
+ionic_dev_tx_queue_stop(struct rte_eth_dev *dev, uint16_t tx_queue_id)
 {
-	struct ionic_tx_stats *stats;
-	struct ionic_tx_qcq *txq;
+	ionic_dev_tx_queue_stop_firsthalf(dev, tx_queue_id);
+	ionic_dev_tx_queue_stop_secondhalf(dev, tx_queue_id);
+
+	return 0;
+}
+
+void __rte_cold
+ionic_dev_tx_queue_stop_firsthalf(struct rte_eth_dev *dev,
+				uint16_t tx_queue_id)
+{
+	struct ionic_tx_qcq *txq = dev->data->tx_queues[tx_queue_id];
 
 	IONIC_PRINT(DEBUG, "Stopping TX queue %u", tx_queue_id);
 
-	txq = eth_dev->data->tx_queues[tx_queue_id];
+	dev->data->tx_queue_state[tx_queue_id] = RTE_ETH_QUEUE_STATE_STOPPED;
 
-	eth_dev->data->tx_queue_state[tx_queue_id] =
-		RTE_ETH_QUEUE_STATE_STOPPED;
+	ionic_lif_txq_deinit_nowait(txq);
+}
 
-	/*
-	 * Note: we should better post NOP Tx desc and wait for its completion
-	 * before disabling Tx queue
-	 */
+void __rte_cold
+ionic_dev_tx_queue_stop_secondhalf(struct rte_eth_dev *dev,
+				uint16_t tx_queue_id)
+{
+	struct ionic_lif *lif = IONIC_ETH_DEV_TO_LIF(dev);
+	struct ionic_tx_qcq *txq = dev->data->tx_queues[tx_queue_id];
 
-	ionic_lif_txq_deinit(txq);
+	ionic_adminq_wait(lif, &txq->admin_ctx);
 
 	/* Free all buffers from descriptor ring */
 	ionic_tx_empty(txq);
 
-	stats = &txq->stats;
-	IONIC_PRINT(DEBUG, "TX queue %u pkts %ju tso %ju",
-		txq->qcq.q.index, stats->packets, stats->tso);
-	IONIC_PRINT(DEBUG, "TX queue %u comps %ju (%ju per)",
-		txq->qcq.q.index, stats->comps,
-		stats->comps ? stats->packets / stats->comps : 0);
-
-	return 0;
+	ionic_lif_txq_stats(txq);
 }
 
 int __rte_cold
@@ -726,28 +730,40 @@ ionic_dev_rx_queue_start(struct rte_eth_dev *eth_dev, uint16_t rx_queue_id)
  * Stop Receive Units for specified queue.
  */
 int __rte_cold
-ionic_dev_rx_queue_stop(struct rte_eth_dev *eth_dev, uint16_t rx_queue_id)
+ionic_dev_rx_queue_stop(struct rte_eth_dev *dev, uint16_t rx_queue_id)
 {
-	uint8_t *rx_queue_state = eth_dev->data->rx_queue_state;
-	struct ionic_rx_stats *stats;
-	struct ionic_rx_qcq *rxq;
+	ionic_dev_rx_queue_stop_firsthalf(dev, rx_queue_id);
+	ionic_dev_rx_queue_stop_secondhalf(dev, rx_queue_id);
+
+	return 0;
+}
+
+void __rte_cold
+ionic_dev_rx_queue_stop_firsthalf(struct rte_eth_dev *dev,
+				uint16_t rx_queue_id)
+{
+	struct ionic_rx_qcq *rxq = dev->data->rx_queues[rx_queue_id];
 
 	IONIC_PRINT(DEBUG, "Stopping RX queue %u", rx_queue_id);
 
-	rxq = eth_dev->data->rx_queues[rx_queue_id];
+	dev->data->rx_queue_state[rx_queue_id] = RTE_ETH_QUEUE_STATE_STOPPED;
+
+	ionic_lif_rxq_deinit_nowait(rxq);
+}
 
-	rx_queue_state[rx_queue_id] = RTE_ETH_QUEUE_STATE_STOPPED;
+void __rte_cold
+ionic_dev_rx_queue_stop_secondhalf(struct rte_eth_dev *dev,
+				uint16_t rx_queue_id)
+{
+	struct ionic_lif *lif = IONIC_ETH_DEV_TO_LIF(dev);
+	struct ionic_rx_qcq *rxq = dev->data->rx_queues[rx_queue_id];
 
-	ionic_lif_rxq_deinit(rxq);
+	ionic_adminq_wait(lif, &rxq->admin_ctx);
 
 	/* Free all buffers from descriptor ring */
 	ionic_rx_empty(rxq);
 
-	stats = &rxq->stats;
-	IONIC_PRINT(DEBUG, "RX queue %u pkts %ju mtod %ju",
-		rxq->qcq.q.index, stats->packets, stats->mtods);
-
-	return 0;
+	ionic_lif_rxq_stats(rxq);
 }
 
 int
diff --git a/drivers/net/ionic/ionic_rxtx.h b/drivers/net/ionic/ionic_rxtx.h
index 5348395956..7ca23178cc 100644
--- a/drivers/net/ionic/ionic_rxtx.h
+++ b/drivers/net/ionic/ionic_rxtx.h
@@ -37,14 +37,24 @@ int ionic_dev_rx_queue_setup(struct rte_eth_dev *dev, uint16_t rx_queue_id,
 	const struct rte_eth_rxconf *rx_conf, struct rte_mempool *mp);
 void ionic_dev_rx_queue_release(struct rte_eth_dev *dev, uint16_t qid);
 int ionic_dev_rx_queue_start(struct rte_eth_dev *dev, uint16_t rx_queue_id);
-int ionic_dev_rx_queue_stop(struct rte_eth_dev *eth_dev, uint16_t rx_queue_id);
+int ionic_dev_rx_queue_stop(struct rte_eth_dev *dev, uint16_t rx_queue_id);
 
 int ionic_dev_tx_queue_setup(struct rte_eth_dev *dev, uint16_t tx_queue_id,
 	uint16_t nb_desc,  uint32_t socket_id,
 	const struct rte_eth_txconf *tx_conf);
 void ionic_dev_tx_queue_release(struct rte_eth_dev *dev, uint16_t qid);
-int ionic_dev_tx_queue_stop(struct rte_eth_dev *eth_dev, uint16_t tx_queue_id);
 int ionic_dev_tx_queue_start(struct rte_eth_dev *dev, uint16_t tx_queue_id);
+int ionic_dev_tx_queue_stop(struct rte_eth_dev *dev, uint16_t tx_queue_id);
+
+/* Helpers for optimized dev_stop() */
+void ionic_dev_rx_queue_stop_firsthalf(struct rte_eth_dev *dev,
+	uint16_t rx_queue_id);
+void ionic_dev_rx_queue_stop_secondhalf(struct rte_eth_dev *dev,
+	uint16_t rx_queue_id);
+void ionic_dev_tx_queue_stop_firsthalf(struct rte_eth_dev *dev,
+	uint16_t tx_queue_id);
+void ionic_dev_tx_queue_stop_secondhalf(struct rte_eth_dev *dev,
+	uint16_t tx_queue_id);
 
 void ionic_rxq_info_get(struct rte_eth_dev *dev, uint16_t queue_id,
 	struct rte_eth_rxq_info *qinfo);
-- 
2.17.1