To reduce flow migration overhead, replace the array-based
representation of which set of ports are bound to a particular queue
by a multi-word bitset.
Signed-off-by: Mattias Rönnblom <mattias.ronnb...@ericsson.com>
---
drivers/event/dsw/dsw_evdev.c | 34 +++++++++++++++++++---------------
drivers/event/dsw/dsw_evdev.h | 3 ++-
drivers/event/dsw/dsw_event.c | 11 ++++-------
3 files changed, 25 insertions(+), 23 deletions(-)
diff --git a/drivers/event/dsw/dsw_evdev.c b/drivers/event/dsw/dsw_evdev.c
index 1209e73a9d..a0781e4141 100644
--- a/drivers/event/dsw/dsw_evdev.c
+++ b/drivers/event/dsw/dsw_evdev.c
@@ -118,6 +118,7 @@ dsw_queue_setup(struct rte_eventdev *dev, uint8_t queue_id,
queue->schedule_type = conf->schedule_type;
}
+ rte_bitset_init(queue->serving_ports, DSW_MAX_PORTS);
queue->num_serving_ports = 0;
return 0;
@@ -144,24 +145,19 @@ dsw_queue_release(struct rte_eventdev *dev __rte_unused,
static void
queue_add_port(struct dsw_queue *queue, uint16_t port_id)
{
- queue->serving_ports[queue->num_serving_ports] = port_id;
+ rte_bitset_set(queue->serving_ports, port_id);
queue->num_serving_ports++;
}
static bool
queue_remove_port(struct dsw_queue *queue, uint16_t port_id)
{
- uint16_t i;
+ if (rte_bitset_test(queue->serving_ports, port_id)) {
+ queue->num_serving_ports--;
+ rte_bitset_clear(queue->serving_ports, port_id);
+ return true;
+ }
- for (i = 0; i < queue->num_serving_ports; i++)
- if (queue->serving_ports[i] == port_id) {
- uint16_t last_idx = queue->num_serving_ports - 1;
- if (i != last_idx)
- queue->serving_ports[i] =
- queue->serving_ports[last_idx];
- queue->num_serving_ports--;
- return true;
- }
return false;
}
@@ -256,10 +252,18 @@ initial_flow_to_port_assignment(struct dsw_evdev *dsw)
struct dsw_queue *queue = &dsw->queues[queue_id];
uint16_t flow_hash;
for (flow_hash = 0; flow_hash < DSW_MAX_FLOWS; flow_hash++) {
- uint8_t port_idx =
- rte_rand() % queue->num_serving_ports;
- uint8_t port_id =
- queue->serving_ports[port_idx];
+ uint8_t skip = rte_rand_max(queue->num_serving_ports);
+ uint8_t port_id;
+
+ for (port_id = 0;; port_id++) {
+ if (rte_bitset_test(queue->serving_ports,
+ port_id)) {
+ if (skip == 0)
+ break;
+ skip--;
+ }
+ }
+
dsw->queues[queue_id].flow_to_port_map[flow_hash] =
port_id;
}
diff --git a/drivers/event/dsw/dsw_evdev.h b/drivers/event/dsw/dsw_evdev.h
index 6416a8a898..503a63cbb2 100644
--- a/drivers/event/dsw/dsw_evdev.h
+++ b/drivers/event/dsw/dsw_evdev.h
@@ -7,6 +7,7 @@
#include <eventdev_pmd.h>
+#include <rte_bitset.h>
#include <rte_event_ring.h>
#include <rte_eventdev.h>
@@ -234,7 +235,7 @@ struct dsw_port {
struct dsw_queue {
uint8_t schedule_type;
- uint8_t serving_ports[DSW_MAX_PORTS];
+ RTE_BITSET_DECLARE(serving_ports, DSW_MAX_PORTS);
uint16_t num_serving_ports;
uint8_t flow_to_port_map[DSW_MAX_FLOWS] __rte_cache_aligned;
diff --git a/drivers/event/dsw/dsw_event.c b/drivers/event/dsw/dsw_event.c
index 93bbeead2e..b855f9ecf1 100644
--- a/drivers/event/dsw/dsw_event.c
+++ b/drivers/event/dsw/dsw_event.c
@@ -447,13 +447,8 @@ static bool
dsw_is_serving_port(struct dsw_evdev *dsw, uint8_t port_id, uint8_t queue_id)
{
struct dsw_queue *queue = &dsw->queues[queue_id];
- uint16_t i;
-
- for (i = 0; i < queue->num_serving_ports; i++)
- if (queue->serving_ports[i] == port_id)
- return true;
- return false;
+ return rte_bitset_test(queue->serving_ports, port_id);
}
static bool
@@ -575,7 +570,9 @@ dsw_schedule(struct dsw_evdev *dsw, uint8_t queue_id,
uint16_t flow_hash)
/* A single-link queue, or atomic/ordered/parallel but
* with just a single serving port.
*/
- port_id = queue->serving_ports[0];
+ port_id = (uint8_t)rte_bitset_find_first_set(
+ queue->serving_ports, DSW_MAX_PORTS
+ );
DSW_LOG_DP(DEBUG, "Event with queue_id %d flow_hash %d is scheduled "
"to port %d.\n", queue_id, flow_hash, port_id);
--
2.34.1
