[PATCH 3/3] event/dlb2: optimize credit allocations

[Timothy McDaniel]

This commit implements the changes required for using suggested
port type hint feature. Each port uses different credit quanta
based on port type specified using port configuration flags.

Each port has separate quanta defined in dlb2_priv.h
Producer and consumer ports will need larger quanta value to reduce number
of credit calls they make. Workers can use small quanta as they mostly
work out of locally cached credits and don't request/return credits often.

Signed-off-by: Timothy McDaniel <timothy.mcdan...@intel.com>
---
 drivers/event/dlb2/dlb2.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/event/dlb2/dlb2.c b/drivers/event/dlb2/dlb2.c
index 76f51736c4..438184bb27 100644
--- a/drivers/event/dlb2/dlb2.c
+++ b/drivers/event/dlb2/dlb2.c
@@ -1945,8 +1945,8 @@ dlb2_eventdev_port_setup(struct rte_eventdev *dev,
 {
        struct dlb2_eventdev *dlb2;
        struct dlb2_eventdev_port *ev_port;
-       int ret;
        uint32_t hw_credit_quanta, sw_credit_quanta;
+       int ret;
 
        if (dev == NULL || port_conf == NULL) {
                DLB2_LOG_ERR("Null parameter\n");
@@ -2047,6 +2047,23 @@ dlb2_eventdev_port_setup(struct rte_eventdev *dev,
        ev_port->inflight_credits = 0;
        ev_port->dlb2 = dlb2; /* reverse link */
 
+       /* Default for worker ports */
+       sw_credit_quanta = dlb2->sw_credit_quanta;
+       hw_credit_quanta = dlb2->hw_credit_quanta;
+
+       if (port_conf->event_port_cfg & RTE_EVENT_PORT_CFG_HINT_PRODUCER) {
+               /* Producer type ports. Mostly enqueue */
+               sw_credit_quanta = DLB2_SW_CREDIT_P_QUANTA_DEFAULT;
+               hw_credit_quanta = DLB2_SW_CREDIT_P_BATCH_SZ;
+       }
+       if (port_conf->event_port_cfg & RTE_EVENT_PORT_CFG_HINT_CONSUMER) {
+               /* Consumer type ports. Mostly dequeue */
+               sw_credit_quanta = DLB2_SW_CREDIT_C_QUANTA_DEFAULT;
+               hw_credit_quanta = DLB2_SW_CREDIT_C_BATCH_SZ;
+       }
+       ev_port->credit_update_quanta = sw_credit_quanta;
+       ev_port->qm_port.hw_credit_quanta = hw_credit_quanta;
+
        /* Tear down pre-existing port->queue links */
        if (dlb2->run_state == DLB2_RUN_STATE_STOPPED)
                dlb2_port_link_teardown(dlb2, &dlb2->ev_ports[ev_port_id]);
-- 
2.23.0