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* [dpdk-dev] [PATCH] examples/l3fwd: remove useless reloads in FIB main loop
@ 2021-07-05 17:05 Conor Walsh
  2021-07-05 17:32 ` Ananyev, Konstantin
                   ` (3 more replies)
  0 siblings, 4 replies; 6+ messages in thread
From: Conor Walsh @ 2021-07-05 17:05 UTC (permalink / raw)
  To: konstantin.ananyev, vladimir.medvedkin, ruifeng.wang, jerinj
  Cc: dev, paulis.gributs, Conor Walsh

This patch aligns the l3fwd FIB code with the changes made to LPM in
commit 74fb854a3de6 ("examples/l3fwd: remove useless reloads in LPM
main loop").
This change ensures the compiler knows that the lcore config variables
are constant values and the compiler will then optimize the code
accordingly.

Signed-off-by: Conor Walsh <conor.walsh@intel.com>
---
 examples/l3fwd/l3fwd_fib.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/examples/l3fwd/l3fwd_fib.c b/examples/l3fwd/l3fwd_fib.c
index 1787229942..d083ddfdd5 100644
--- a/examples/l3fwd/l3fwd_fib.c
+++ b/examples/l3fwd/l3fwd_fib.c
@@ -182,14 +182,16 @@ fib_main_loop(__rte_unused void *dummy)
 	lcore_id = rte_lcore_id();
 	qconf = &lcore_conf[lcore_id];
 
-	if (qconf->n_rx_queue == 0) {
+	const uint16_t n_rx_q = qconf->n_rx_queue;
+	const uint16_t n_tx_p = qconf->n_tx_port;
+	if (n_rx_q == 0) {
 		RTE_LOG(INFO, L3FWD, "lcore %u has nothing to do\n", lcore_id);
 		return 0;
 	}
 
 	RTE_LOG(INFO, L3FWD, "entering main loop on lcore %u\n", lcore_id);
 
-	for (i = 0; i < qconf->n_rx_queue; i++) {
+	for (i = 0; i < n_rx_q; i++) {
 
 		portid = qconf->rx_queue_list[i].port_id;
 		queueid = qconf->rx_queue_list[i].queue_id;
@@ -207,7 +209,7 @@ fib_main_loop(__rte_unused void *dummy)
 		diff_tsc = cur_tsc - prev_tsc;
 		if (unlikely(diff_tsc > drain_tsc)) {
 
-			for (i = 0; i < qconf->n_tx_port; ++i) {
+			for (i = 0; i < n_tx_p; ++i) {
 				portid = qconf->tx_port_id[i];
 				if (qconf->tx_mbufs[portid].len == 0)
 					continue;
@@ -221,7 +223,7 @@ fib_main_loop(__rte_unused void *dummy)
 		}
 
 		/* Read packet from RX queues. */
-		for (i = 0; i < qconf->n_rx_queue; ++i) {
+		for (i = 0; i < n_rx_q; ++i) {
 			portid = qconf->rx_queue_list[i].port_id;
 			queueid = qconf->rx_queue_list[i].queue_id;
 			nb_rx = rte_eth_rx_burst(portid, queueid, pkts_burst,
-- 
2.25.1


^ permalink raw reply	[flat|nested] 6+ messages in thread

end of thread, other threads:[~2021-07-07  9:57 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-07-05 17:05 [dpdk-dev] [PATCH] examples/l3fwd: remove useless reloads in FIB main loop Conor Walsh
2021-07-05 17:32 ` Ananyev, Konstantin
2021-07-06  1:38 ` Ruifeng Wang
2021-07-06 11:29 ` David Marchand
2021-07-06 11:55   ` Walsh, Conor
2021-07-07  9:57 ` David Marchand

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