[PATCH v2] event/cnxk: flush event queues over multiple pass

[Shijith Thotton <sthotton@marvell.com>]

If an event queue flush does not complete after a fixed number of tries,
remaining queues are flushed before retrying the one with incomplete
flush.

Signed-off-by: Shijith Thotton <sthotton@marvell.com>
---
 drivers/event/cnxk/cn10k_eventdev.c | 10 +++++++++-
 drivers/event/cnxk/cn9k_eventdev.c  | 10 +++++++++-
 drivers/event/cnxk/cnxk_eventdev.c  | 31 ++++++++++++++++++++++-------
 drivers/event/cnxk/cnxk_eventdev.h  |  5 +++--
 4 files changed, 45 insertions(+), 11 deletions(-)

diff --git a/drivers/event/cnxk/cn10k_eventdev.c b/drivers/event/cnxk/cn10k_eventdev.c
index 94829e789c..f70c4c58ce 100644
--- a/drivers/event/cnxk/cn10k_eventdev.c
+++ b/drivers/event/cnxk/cn10k_eventdev.c
@@ -108,10 +108,11 @@ cn10k_sso_hws_release(void *arg, void *hws)
 	memset(ws, 0, sizeof(*ws));
 }
 
-static void
+static int
 cn10k_sso_hws_flush_events(void *hws, uint8_t queue_id, uintptr_t base,
 			   cnxk_handle_event_t fn, void *arg)
 {
+	uint64_t retry = CNXK_SSO_FLUSH_RETRY_MAX;
 	struct cn10k_sso_hws *ws = hws;
 	uint64_t cq_ds_cnt = 1;
 	uint64_t aq_cnt = 1;
@@ -141,6 +142,8 @@ cn10k_sso_hws_flush_events(void *hws, uint8_t queue_id, uintptr_t base,
 			fn(arg, ev);
 		if (ev.sched_type != SSO_TT_EMPTY)
 			cnxk_sso_hws_swtag_flush(ws->base);
+		else if (retry-- == 0)
+			break;
 		do {
 			val = plt_read64(ws->base + SSOW_LF_GWS_PENDSTATE);
 		} while (val & BIT_ULL(56));
@@ -151,8 +154,13 @@ cn10k_sso_hws_flush_events(void *hws, uint8_t queue_id, uintptr_t base,
 		cq_ds_cnt &= 0x3FFF3FFF0000;
 	}
 
+	if (aq_cnt || cq_ds_cnt || ds_cnt)
+		return -EAGAIN;
+
 	plt_write64(0, ws->base + SSOW_LF_GWS_OP_GWC_INVAL);
 	rte_mb();
+
+	return 0;
 }
 
 static void
diff --git a/drivers/event/cnxk/cn9k_eventdev.c b/drivers/event/cnxk/cn9k_eventdev.c
index 987888d3db..dce975bba2 100644
--- a/drivers/event/cnxk/cn9k_eventdev.c
+++ b/drivers/event/cnxk/cn9k_eventdev.c
@@ -117,11 +117,12 @@ cn9k_sso_hws_release(void *arg, void *hws)
 	}
 }
 
-static void
+static int
 cn9k_sso_hws_flush_events(void *hws, uint8_t queue_id, uintptr_t base,
 			  cnxk_handle_event_t fn, void *arg)
 {
 	struct cnxk_sso_evdev *dev = cnxk_sso_pmd_priv(arg);
+	uint64_t retry = CNXK_SSO_FLUSH_RETRY_MAX;
 	struct cnxk_timesync_info *tstamp;
 	struct cn9k_sso_hws_dual *dws;
 	struct cn9k_sso_hws *ws;
@@ -164,6 +165,8 @@ cn9k_sso_hws_flush_events(void *hws, uint8_t queue_id, uintptr_t base,
 			fn(arg, ev);
 		if (ev.sched_type != SSO_TT_EMPTY)
 			cnxk_sso_hws_swtag_flush(ws_base);
+		else if (retry-- == 0)
+			break;
 		do {
 			val = plt_read64(ws_base + SSOW_LF_GWS_PENDSTATE);
 		} while (val & BIT_ULL(56));
@@ -174,7 +177,12 @@ cn9k_sso_hws_flush_events(void *hws, uint8_t queue_id, uintptr_t base,
 		cq_ds_cnt &= 0x3FFF3FFF0000;
 	}
 
+	if (aq_cnt || cq_ds_cnt || ds_cnt)
+		return -EAGAIN;
+
 	plt_write64(0, ws_base + SSOW_LF_GWS_OP_GWC_INVAL);
+
+	return 0;
 }
 
 static void
diff --git a/drivers/event/cnxk/cnxk_eventdev.c b/drivers/event/cnxk/cnxk_eventdev.c
index be021d86c9..91235ed9f3 100644
--- a/drivers/event/cnxk/cnxk_eventdev.c
+++ b/drivers/event/cnxk/cnxk_eventdev.c
@@ -385,9 +385,10 @@ static void
 cnxk_sso_cleanup(struct rte_eventdev *event_dev, cnxk_sso_hws_reset_t reset_fn,
 		 cnxk_sso_hws_flush_t flush_fn, uint8_t enable)
 {
+	uint8_t pend_list[RTE_EVENT_MAX_QUEUES_PER_DEV], pend_cnt, new_pcnt;
 	struct cnxk_sso_evdev *dev = cnxk_sso_pmd_priv(event_dev);
 	uintptr_t hwgrp_base;
-	uint16_t i;
+	uint8_t queue_id, i;
 	void *ws;
 
 	for (i = 0; i < dev->nb_event_ports; i++) {
@@ -396,14 +397,30 @@ cnxk_sso_cleanup(struct rte_eventdev *event_dev, cnxk_sso_hws_reset_t reset_fn,
 	}
 
 	rte_mb();
+
+	/* Consume all the events through HWS0 */
 	ws = event_dev->data->ports[0];
 
-	for (i = 0; i < dev->nb_event_queues; i++) {
-		/* Consume all the events through HWS0 */
-		hwgrp_base = roc_sso_hwgrp_base_get(&dev->sso, i);
-		flush_fn(ws, i, hwgrp_base, cnxk_handle_event, event_dev);
-		/* Enable/Disable SSO GGRP */
-		plt_write64(enable, hwgrp_base + SSO_LF_GGRP_QCTL);
+	/* Starting list of queues to flush */
+	pend_cnt = dev->nb_event_queues;
+	for (i = 0; i < dev->nb_event_queues; i++)
+		pend_list[i] = i;
+
+	while (pend_cnt) {
+		new_pcnt = 0;
+		for (i = 0; i < pend_cnt; i++) {
+			queue_id = pend_list[i];
+			hwgrp_base =
+				roc_sso_hwgrp_base_get(&dev->sso, queue_id);
+			if (flush_fn(ws, queue_id, hwgrp_base,
+				     cnxk_handle_event, event_dev)) {
+				pend_list[new_pcnt++] = queue_id;
+				continue;
+			}
+			/* Enable/Disable SSO GGRP */
+			plt_write64(enable, hwgrp_base + SSO_LF_GGRP_QCTL);
+		}
+		pend_cnt = new_pcnt;
 	}
 }
 
diff --git a/drivers/event/cnxk/cnxk_eventdev.h b/drivers/event/cnxk/cnxk_eventdev.h
index 5564746e6d..a490829a8a 100644
--- a/drivers/event/cnxk/cnxk_eventdev.h
+++ b/drivers/event/cnxk/cnxk_eventdev.h
@@ -54,6 +54,7 @@
 #define CN10K_GW_MODE_PREF     1
 #define CN10K_GW_MODE_PREF_WFE 2
 
+#define CNXK_SSO_FLUSH_RETRY_MAX 0xfff
 #define CNXK_VALID_DEV_OR_ERR_RET(dev, drv_name)                               \
 	do {                                                                   \
 		if (strncmp(dev->driver->name, drv_name, strlen(drv_name)))    \
@@ -69,8 +70,8 @@ typedef int (*cnxk_sso_unlink_t)(void *dev, void *ws, uint16_t *map,
 				 uint16_t nb_link);
 typedef void (*cnxk_handle_event_t)(void *arg, struct rte_event ev);
 typedef void (*cnxk_sso_hws_reset_t)(void *arg, void *ws);
-typedef void (*cnxk_sso_hws_flush_t)(void *ws, uint8_t queue_id, uintptr_t base,
-				     cnxk_handle_event_t fn, void *arg);
+typedef int (*cnxk_sso_hws_flush_t)(void *ws, uint8_t queue_id, uintptr_t base,
+				    cnxk_handle_event_t fn, void *arg);
 
 struct cnxk_sso_qos {
 	uint16_t queue;
-- 
2.25.1