[PATCH v6] gro : 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.

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

 app/test-pmd/csumonly.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/app/test-pmd/csumonly.c b/app/test-pmd/csumonly.c
index c103e54111..21b45b4ba4 100644
--- a/app/test-pmd/csumonly.c
+++ b/app/test-pmd/csumonly.c
@@ -863,16 +863,22 @@ 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);
+#ifndef RTE_LIB_GRO
 	if (unlikely(nb_rx == 0))
 		return false;
-
+#else
+	gro_enable = gro_ports[fs->rx_port].enable;
+	if (unlikely(nb_rx == 0)) {
+		if (!gro_enable || (gro_flush_cycles == GRO_DEFAULT_FLUSH_CYCLES))
+			return false;
+		if ((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;
-- 
2.25.1