[dpdk-dev] [PATCH 1/2] net/bonding: fix dedicated queue mode in vector burst

["Min Hu (Connor)" <humin29@huawei.com>]

From: Chengchang Tang <tangchengchang@huawei.com>

If the vector burst mode is selected, the dedicated queue mode will not
take effect on some PMDs because these PMDs may have some limitaions
in vector burst mode. For example, the limit on burst size. Currently,
both hns3 and intel I40E require four alignments when receiving packets
in vector mode. As a result, they cannt accept packets if burst size
below four. However, in dedicated queue mode, the burst size of periodic
packets processing is one.

This patch fixes the above problem by modifying the burst size to 32.
This approach also makes the packet processing of the dedicated queue
mode more reasonable. Currently, if multiple lacp protocol packets are
received in the hardware queue in a cycle, only one lacp packet will be
processed in this cycle, and the left packets will be processed in the
following cycle. After the modification, all the lacp packets will be
processed at one time, which seems more reasonable and closer to the
behavior of the bonding driver when the dedicated queue is not turned on.

Fixes: 112891cd27e5 ("net/bonding: add dedicated HW queues for LACP control")
Cc: stable@dpdk.org

Signed-off-by: Chengchang Tang <tangchengchang@huawei.com>
Signed-off-by: Min Hu(Connor) <humin29@huawei.com>
---
 drivers/net/bonding/rte_eth_bond_8023ad.c | 32 ++++++++++++++++-------
 1 file changed, 23 insertions(+), 9 deletions(-)

diff --git a/drivers/net/bonding/rte_eth_bond_8023ad.c b/drivers/net/bonding/rte_eth_bond_8023ad.c
index 8b5b32fcaf..fc8ebd6320 100644
--- a/drivers/net/bonding/rte_eth_bond_8023ad.c
+++ b/drivers/net/bonding/rte_eth_bond_8023ad.c
@@ -838,6 +838,27 @@ rx_machine_update(struct bond_dev_private *internals, uint16_t slave_id,
 		rx_machine(internals, slave_id, NULL);
 }
 
+static void
+bond_mode_8023ad_dedicated_rxq_process(struct bond_dev_private *internals,
+			uint16_t slave_id)
+{
+#define DEDICATED_QUEUE_BURST_SIZE 32
+	struct rte_mbuf *lacp_pkt[DEDICATED_QUEUE_BURST_SIZE];
+	uint16_t rx_count = rte_eth_rx_burst(slave_id,
+				internals->mode4.dedicated_queues.rx_qid,
+				lacp_pkt, DEDICATED_QUEUE_BURST_SIZE);
+
+	if (rx_count) {
+		uint16_t i;
+
+		for (i = 0; i < rx_count; i++)
+			bond_mode_8023ad_handle_slow_pkt(internals, slave_id,
+					lacp_pkt[i]);
+	} else {
+		rx_machine_update(internals, slave_id, NULL);
+	}
+}
+
 static void
 bond_mode_8023ad_periodic_cb(void *arg)
 {
@@ -926,15 +947,8 @@ bond_mode_8023ad_periodic_cb(void *arg)
 
 			rx_machine_update(internals, slave_id, lacp_pkt);
 		} else {
-			uint16_t rx_count = rte_eth_rx_burst(slave_id,
-					internals->mode4.dedicated_queues.rx_qid,
-					&lacp_pkt, 1);
-
-			if (rx_count == 1)
-				bond_mode_8023ad_handle_slow_pkt(internals,
-						slave_id, lacp_pkt);
-			else
-				rx_machine_update(internals, slave_id, NULL);
+			bond_mode_8023ad_dedicated_rxq_process(internals,
+					slave_id);
 		}
 
 		periodic_machine(internals, slave_id);
-- 
2.33.0