[PATCH v7] app/testpmd : fix packets not getting flushed in heavy-weight mode API

[Kumara Parameshwaran]

In heavy-weight mode GRO which is based on timer, the GRO packets
will not be flushed in spite of timer expiry if there is no packet
in the current poll. If timer mode GRO is enabled the
rte_gro_timeout_flush API should be invoked.

Fixes: b7091f1dcfbc ("app/testpmd: enable the heavyweight mode TCP/IPv4 GRO")
Cc: jiayu.hu at intel.com

Signed-off-by: Kumara Parameshwaran <kumaraparamesh92 at gmail.com>
---
v1:
    Changes to make sure that the GRO flush API is invoked if there are no packets in 
    current poll and timer expiry.

v2:
    Fix code organisation issue

v3:
    Fix warnings

v4:
    Fix error and warnings

v5:
    Fix compilation issue when GRO is not defined

v6:
    Address review comments

v7:
    Address review comments

 app/test-pmd/csumonly.c | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/app/test-pmd/csumonly.c b/app/test-pmd/csumonly.c
index c103e54111..637a46d92a 100644
--- a/app/test-pmd/csumonly.c
+++ b/app/test-pmd/csumonly.c
@@ -863,16 +863,29 @@ pkt_burst_checksum_forward(struct fwd_stream *fs)
 
 	/* receive a burst of packet */
 	nb_rx = common_fwd_stream_receive(fs, pkts_burst, nb_pkt_per_burst);
-	if (unlikely(nb_rx == 0))
+	if (unlikely(nb_rx == 0)) {
+#ifndef RTE_LIB_GRO
 		return false;
+#else
+		gro_enable = gro_ports[fs->rx_port].enable;
+		/*
+		 * Make sure that in case of Heavyweight mode GRO the packets in
+		 * GRO cache should be flushed as the timer could have expired.
+		 *
+		 * The order of condidtions should be the same as gro_ctx is valid
+		 * only when gro_flush_cycles is not the GRO_DEFAULT_FLUSH_CYCLES which
+		 * indicates ligth weight mode GRO
+		 */
+		if (!gro_enable || (gro_flush_cycles == GRO_DEFAULT_FLUSH_CYCLES) ||
+			(rte_gro_get_pkt_count(current_fwd_lcore()->gro_ctx) == 0))
+			return false;
+#endif
+	}
 
 	rx_bad_ip_csum = 0;
 	rx_bad_l4_csum = 0;
 	rx_bad_outer_l4_csum = 0;
 	rx_bad_outer_ip_csum = 0;
-#ifdef RTE_LIB_GRO
-	gro_enable = gro_ports[fs->rx_port].enable;
-#endif
 
 	txp = &ports[fs->tx_port];
 	tx_offloads = txp->dev_conf.txmode.offloads;
@@ -1103,6 +1116,7 @@ pkt_burst_checksum_forward(struct fwd_stream *fs)
 	}
 
 #ifdef RTE_LIB_GRO
+	gro_enable = gro_ports[fs->rx_port].enable;
 	if (unlikely(gro_enable)) {
 		if (gro_flush_cycles == GRO_DEFAULT_FLUSH_CYCLES) {
 			nb_rx = rte_gro_reassemble_burst(pkts_burst, nb_rx,
-- 
2.25.1