[dpdk-dev] [PATCH] examples/l2fwd-crypto: flush crypto dev buffers

[Pablo de Lara <pablo.de.lara.guarch@intel.com>]

Crypto operations are enqueued in the crypto devices
when the crypto device buffers are full (MAX_PKT_BURST),
in order to be more efficient.

The problem is that operations might be stuck in those buffers,
if they never get full, and therefore, those operations
will never be performed.

Therefore, it is necessary to have a buffer flush mechanism,
similar to the one used for flush the TX buffers, so eventually,
all packets received are ciphered and sent out.

Fixes: 387259bd6c67 ("examples/l2fwd-crypto: add sample application")

Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
---
 examples/l2fwd-crypto/main.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/examples/l2fwd-crypto/main.c b/examples/l2fwd-crypto/main.c
index 8dc616d..23b20b1 100644
--- a/examples/l2fwd-crypto/main.c
+++ b/examples/l2fwd-crypto/main.c
@@ -628,7 +628,7 @@ l2fwd_main_loop(struct l2fwd_crypto_options *options)
 
 	unsigned lcore_id = rte_lcore_id();
 	uint64_t prev_tsc = 0, diff_tsc, cur_tsc, timer_tsc = 0;
-	unsigned i, j, portid, nb_rx;
+	unsigned i, j, portid, nb_rx, len;
 	struct lcore_queue_conf *qconf = &lcore_queue_conf[lcore_id];
 	const uint64_t drain_tsc = (rte_get_tsc_hz() + US_PER_S - 1) /
 			US_PER_S * BURST_TX_DRAIN_US;
@@ -727,10 +727,18 @@ l2fwd_main_loop(struct l2fwd_crypto_options *options)
 		cur_tsc = rte_rdtsc();
 
 		/*
-		 * TX burst queue drain
+		 * Crypto device/TX burst queue drain
 		 */
 		diff_tsc = cur_tsc - prev_tsc;
 		if (unlikely(diff_tsc > drain_tsc)) {
+			/* Enqueue all crypto ops remaining in buffers */
+			for (i = 0; i < qconf->nb_crypto_devs; i++) {
+				cparams = &port_cparams[i];
+				len = qconf->op_buf[cparams->dev_id].len;
+				l2fwd_crypto_send_burst(qconf, len, cparams);
+				qconf->op_buf[cparams->dev_id].len = 0;
+			}
+			/* Transmit all packets remaining in buffers */
 			for (portid = 0; portid < RTE_MAX_ETHPORTS; portid++) {
 				if (qconf->pkt_buf[portid].len == 0)
 					continue;
-- 
2.5.5