[PATCH v4] event/dlb2: fix port COS range allocation

[Abdullah Sevincer <abdullah.sevincer@intel.com>]

This commit fixes allocation of port COS
when application requested port COS exceeds
(e.g. beyond 0-15) the number of LDB ports for
the domain.

We limit application specified ports from a
COS to the max ports allocated for the COS
so that the rest of the of the ports can be
allocated from default(best) COS.

Fixes: bec8901bfe9f ("event/dlb2: support ldb port specific COS")
Cc: stable@dpdk.org

Signed-off-by: Abdullah Sevincer <abdullah.sevincer@intel.com>
---
 drivers/event/dlb2/dlb2.c      | 9 ++++++---
 drivers/event/dlb2/dlb2_priv.h | 2 ++
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/event/dlb2/dlb2.c b/drivers/event/dlb2/dlb2.c
index 02f0e57208..60c5cd4804 100644
--- a/drivers/event/dlb2/dlb2.c
+++ b/drivers/event/dlb2/dlb2.c
@@ -182,8 +182,10 @@ dlb2_init_port_cos(struct dlb2_eventdev *dlb2, int *port_cos)
 
 	for (q = 0; q < DLB2_MAX_NUM_PORTS_ALL; q++) {
 		dlb2->ev_ports[q].cos_id = port_cos[q];
-		if (port_cos[q] != DLB2_COS_DEFAULT) {
+		if (port_cos[q] != DLB2_COS_DEFAULT &&
+		    dlb2->cos_ports[port_cos[q]] < DLB2_MAX_NUM_LDB_PORTS_PER_COS) {
 			dlb2->cos_ports[port_cos[q]]++;
+			dlb2->max_cos_port = q;
 		}
 	}
 }
@@ -841,8 +843,9 @@ dlb2_hw_create_sched_domain(struct dlb2_eventdev *dlb2,
 	cos_ports = dlb2->cos_ports[0] + dlb2->cos_ports[1] +
 		    dlb2->cos_ports[2] + dlb2->cos_ports[3];
 
-	if (cos_ports > resources_asked->num_ldb_ports) {
-		DLB2_LOG_ERR("dlb2: num_ldb_ports < nonzero cos_ports\n");
+	if (cos_ports > resources_asked->num_ldb_ports ||
+	    (cos_ports && dlb2->max_cos_port >= resources_asked->num_ldb_ports)) {
+		DLB2_LOG_ERR("dlb2: num_ldb_ports < cos_ports\n");
 		ret = EINVAL;
 		goto error_exit;
 	}
diff --git a/drivers/event/dlb2/dlb2_priv.h b/drivers/event/dlb2/dlb2_priv.h
index ac20c5a179..f4b9e7f9ff 100644
--- a/drivers/event/dlb2/dlb2_priv.h
+++ b/drivers/event/dlb2/dlb2_priv.h
@@ -92,6 +92,7 @@
 #define DLB2_NUM_SN_GROUPS 2
 #define DLB2_MAX_LDB_SN_ALLOC 1024
 #define DLB2_MAX_QUEUE_DEPTH_THRESHOLD 8191
+#define DLB2_MAX_NUM_LDB_PORTS_PER_COS (DLB2_MAX_NUM_LDB_PORTS/DLB2_COS_NUM_VALS)
 
 /* 2048 total hist list entries and 64 total ldb ports, which
  * makes for 2048/64 == 32 hist list entries per port. However, CQ
@@ -635,6 +636,7 @@ struct dlb2_eventdev {
 	};
 	uint32_t cos_ports[DLB2_COS_NUM_VALS]; /* total ldb ports in each class */
 	uint32_t cos_bw[DLB2_COS_NUM_VALS]; /* bandwidth per cos domain */
+	uint8_t max_cos_port; /* Max LDB port from any cos */
 };
 
 /* used for collecting and passing around the dev args */
-- 
2.25.1