[dpdk-dev] [PATCH v3] net/bonding: per-slave intermediate rx ring

[Luca Boccassi]

During bond 802.3ad receive, a burst of packets is fetched from
each slave into a local array and appended to per-slave ring buffer.
Packets are taken from the head of the ring buffer and returned to
the caller.  The number of mbufs provided to each slave is sufficient
to meet the requirements of the ixgbe vector receive.

This small change improves performances of the bonding driver
considerably. Vyatta has been using it for years in production.

Cc: stable at dpdk.org

Signed-off-by: Luca Boccassi <bluca at debian.org>
---
v2 and v3: a couple more checkpatch warnings fixed

 drivers/net/bonding/rte_eth_bond_api.c     | 13 +++
 drivers/net/bonding/rte_eth_bond_pmd.c     | 98 +++++++++++++++++-----
 drivers/net/bonding/rte_eth_bond_private.h |  4 +
 3 files changed, 95 insertions(+), 20 deletions(-)

diff --git a/drivers/net/bonding/rte_eth_bond_api.c b/drivers/net/bonding/rte_eth_bond_api.c
index 8bc04cfd11..3d22203e91 100644
--- a/drivers/net/bonding/rte_eth_bond_api.c
+++ b/drivers/net/bonding/rte_eth_bond_api.c
@@ -524,6 +524,10 @@ __eth_bond_slave_remove_lock_free(uint16_t bonded_port_id,
 					sizeof(*(rte_eth_devices[bonded_port_id].data->mac_addrs)));
 	}
 	if (internals->slave_count == 0) {
+		/* Remove any remaining packets in the receive ring */
+		struct rte_mbuf *bufs[PMD_BOND_RECV_PKTS_PER_SLAVE];
+		unsigned int j, count;
+
 		internals->rx_offload_capa = 0;
 		internals->tx_offload_capa = 0;
 		internals->rx_queue_offload_capa = 0;
@@ -532,6 +536,15 @@ __eth_bond_slave_remove_lock_free(uint16_t bonded_port_id,
 		internals->reta_size = 0;
 		internals->candidate_max_rx_pktlen = 0;
 		internals->max_rx_pktlen = 0;
+
+		do {
+			count = rte_ring_dequeue_burst(internals->rx_ring,
+					(void **)bufs,
+					PMD_BOND_RECV_PKTS_PER_SLAVE,
+					NULL);
+			for  (j = 0; j < count; j++)
+				rte_pktmbuf_free(bufs[j]);
+		} while (count > 0);
 	}
 	return 0;
 }
diff --git a/drivers/net/bonding/rte_eth_bond_pmd.c b/drivers/net/bonding/rte_eth_bond_pmd.c
index 58f7377c60..ae756c4e3a 100644
--- a/drivers/net/bonding/rte_eth_bond_pmd.c
+++ b/drivers/net/bonding/rte_eth_bond_pmd.c
@@ -18,6 +18,8 @@
 #include <rte_alarm.h>
 #include <rte_cycles.h>
 #include <rte_string_fns.h>
+#include <rte_errno.h>
+#include <rte_lcore.h>
 
 #include "rte_eth_bond.h"
 #include "rte_eth_bond_private.h"
@@ -402,10 +404,15 @@ bond_ethdev_rx_burst_8023ad(void *queue, struct rte_mbuf **bufs,
 	struct bond_dev_private *internals = bd_rx_q->dev_private;
 	struct ether_addr bond_mac;
 
+	unsigned int rx_ring_avail = rte_ring_free_count(internals->rx_ring);
+	struct rte_mbuf *mbuf_bounce[PMD_BOND_RECV_PKTS_PER_SLAVE];
+
 	struct ether_hdr *hdr;
 
 	const uint16_t ether_type_slow_be = rte_be_to_cpu_16(ETHER_TYPE_SLOW);
 	uint16_t num_rx_total = 0;	/* Total number of received packets */
+	uint16_t num_rx_slave;
+	uint16_t num_enq_slave;
 	uint16_t slaves[RTE_MAX_ETHPORTS];
 	uint16_t slave_count, idx;
 
@@ -414,6 +421,9 @@ bond_ethdev_rx_burst_8023ad(void *queue, struct rte_mbuf **bufs,
 	uint8_t i, j, k;
 	uint8_t subtype;
 
+	if (rx_ring_avail < PMD_BOND_RECV_PKTS_PER_SLAVE)
+		goto dequeue;
+
 	rte_eth_macaddr_get(internals->port_id, &bond_mac);
 	/* Copy slave list to protect against slave up/down changes during tx
 	 * bursting */
@@ -426,62 +436,96 @@ bond_ethdev_rx_burst_8023ad(void *queue, struct rte_mbuf **bufs,
 		internals->active_slave = 0;
 		idx = 0;
 	}
-	for (i = 0; i < slave_count && num_rx_total < nb_pkts; i++) {
-		j = num_rx_total;
+	for (i = 0; i < slave_count && num_rx_total < rx_ring_avail; i++) {
+		j = 0;
 		collecting = ACTOR_STATE(&mode_8023ad_ports[slaves[idx]],
 					 COLLECTING);
 
 		/* Read packets from this slave */
-		num_rx_total += rte_eth_rx_burst(slaves[idx], bd_rx_q->queue_id,
-				&bufs[num_rx_total], nb_pkts - num_rx_total);
+		if (unlikely(rx_ring_avail - num_rx_total <
+				PMD_BOND_RECV_PKTS_PER_SLAVE))
+			continue;
+		num_rx_slave = rte_eth_rx_burst(slaves[idx], bd_rx_q->queue_id,
+				mbuf_bounce, PMD_BOND_RECV_PKTS_PER_SLAVE);
 
-		for (k = j; k < 2 && k < num_rx_total; k++)
-			rte_prefetch0(rte_pktmbuf_mtod(bufs[k], void *));
+		for (k = j; k < 2 && k < num_rx_slave; k++)
+			rte_prefetch0(rte_pktmbuf_mtod(mbuf_bounce[k], void *));
 
 		/* Handle slow protocol packets. */
-		while (j < num_rx_total) {
+		while (j < num_rx_slave) {
 
 			/* If packet is not pure L2 and is known, skip it */
-			if ((bufs[j]->packet_type & ~RTE_PTYPE_L2_ETHER) != 0) {
+			if ((mbuf_bounce[j]->packet_type & ~RTE_PTYPE_L2_ETHER) != 0) {
 				j++;
 				continue;
 			}
 
-			if (j + 3 < num_rx_total)
-				rte_prefetch0(rte_pktmbuf_mtod(bufs[j + 3], void *));
+			if (j + 3 < num_rx_slave)
+				rte_prefetch0(rte_pktmbuf_mtod(mbuf_bounce[j + 3],
+							       void *));
 
-			hdr = rte_pktmbuf_mtod(bufs[j], struct ether_hdr *);
+			hdr = rte_pktmbuf_mtod(mbuf_bounce[j],
+					       struct ether_hdr *);
 			subtype = ((struct slow_protocol_frame *)hdr)->slow_protocol.subtype;
 
 			/* Remove packet from array if it is slow packet or slave is not
 			 * in collecting state or bonding interface is not in promiscuous
 			 * mode and packet address does not match. */
-			if (unlikely(is_lacp_packets(hdr->ether_type, subtype, bufs[j]) ||
+			if (unlikely(is_lacp_packets(hdr->ether_type,
+						     subtype, mbuf_bounce[j]) ||
 				!collecting || (!promisc &&
 					!is_multicast_ether_addr(&hdr->d_addr) &&
 					!is_same_ether_addr(&bond_mac, &hdr->d_addr)))) {
 
 				if (hdr->ether_type == ether_type_slow_be) {
 					bond_mode_8023ad_handle_slow_pkt(
-					    internals, slaves[idx], bufs[j]);
+					    internals, slaves[idx],
+					    mbuf_bounce[j]);
 				} else
-					rte_pktmbuf_free(bufs[j]);
+					rte_pktmbuf_free(mbuf_bounce[j]);
 
 				/* Packet is managed by mode 4 or dropped, shift the array */
-				num_rx_total--;
-				if (j < num_rx_total) {
-					memmove(&bufs[j], &bufs[j + 1], sizeof(bufs[0]) *
-						(num_rx_total - j));
+				num_rx_slave--;
+				if (j < num_rx_slave) {
+					memmove(&mbuf_bounce[j],
+						&mbuf_bounce[j + 1],
+						sizeof(mbuf_bounce[0]) *
+						(num_rx_slave - j));
 				}
-			} else
+			} else {
 				j++;
+			}
 		}
+
+		if (num_rx_slave > 0) {
+			if (mbuf_bounce[0] == NULL)
+				RTE_LOG(ERR, PMD, "%s: Enqueue a NULL??\n",
+					__func__);
+
+			num_enq_slave = rte_ring_enqueue_burst(internals->rx_ring,
+							       (void **)mbuf_bounce,
+							       num_rx_slave,
+							       NULL);
+
+			if (num_enq_slave < num_rx_slave) {
+				RTE_LOG(ERR, PMD,
+					"%s: failed to enqueue %u packets",
+					__func__,
+					(num_rx_slave - num_enq_slave));
+				for (j = num_enq_slave; j < num_rx_slave; j++)
+					rte_pktmbuf_free(mbuf_bounce[j]);
+			}
+			num_rx_total += num_enq_slave;
+		}
+
 		if (unlikely(++idx == slave_count))
 			idx = 0;
 	}
 
 	internals->active_slave = idx;
-	return num_rx_total;
+dequeue:
+	return rte_ring_dequeue_burst(internals->rx_ring, (void **)bufs,
+				      nb_pkts, NULL);
 }
 
 #if defined(RTE_LIBRTE_BOND_DEBUG_ALB) || defined(RTE_LIBRTE_BOND_DEBUG_ALB_L1)
@@ -3065,6 +3109,7 @@ bond_alloc(struct rte_vdev_device *dev, uint8_t mode)
 	struct bond_dev_private *internals = NULL;
 	struct rte_eth_dev *eth_dev = NULL;
 	uint32_t vlan_filter_bmp_size;
+	char mem_name[RTE_ETH_NAME_MAX_LEN];
 
 	/* now do all data allocation - for eth_dev structure, dummy pci driver
 	 * and internal (private) data
@@ -3129,6 +3174,19 @@ bond_alloc(struct rte_vdev_device *dev, uint8_t mode)
 	TAILQ_INIT(&internals->flow_list);
 	internals->flow_isolated_valid = 0;
 
+	snprintf(mem_name, RTE_DIM(mem_name), "bond_%u_rx", internals->port_id);
+	internals->rx_ring = rte_ring_lookup(mem_name);
+	if (internals->rx_ring == NULL) {
+		internals->rx_ring = rte_ring_create(mem_name,
+				     rte_align32pow2(PMD_BOND_RECV_RING_PKTS *
+						     rte_lcore_count()),
+				     socket_id, 0);
+		if (internals->rx_ring == NULL)
+			rte_panic("%s: Failed to create rx ring '%s': %s\n", name,
+				  mem_name, rte_strerror(rte_errno));
+	}
+
+
 	/* Set mode 4 default configuration */
 	bond_mode_8023ad_setup(eth_dev, NULL);
 	if (bond_ethdev_mode_set(eth_dev, mode)) {
diff --git a/drivers/net/bonding/rte_eth_bond_private.h b/drivers/net/bonding/rte_eth_bond_private.h
index 43e0e448df..80261c6b14 100644
--- a/drivers/net/bonding/rte_eth_bond_private.h
+++ b/drivers/net/bonding/rte_eth_bond_private.h
@@ -26,6 +26,8 @@
 #define PMD_BOND_LSC_POLL_PERIOD_KVARG		("lsc_poll_period_ms")
 #define PMD_BOND_LINK_UP_PROP_DELAY_KVARG	("up_delay")
 #define PMD_BOND_LINK_DOWN_PROP_DELAY_KVARG	("down_delay")
+#define PMD_BOND_RECV_RING_PKTS		512
+#define PMD_BOND_RECV_PKTS_PER_SLAVE		32
 
 #define PMD_BOND_XMIT_POLICY_LAYER2_KVARG	("l2")
 #define PMD_BOND_XMIT_POLICY_LAYER23_KVARG	("l23")
@@ -175,6 +177,8 @@ struct bond_dev_private {
 
 	void *vlan_filter_bmpmem;		/* enabled vlan filter bitmap */
 	struct rte_bitmap *vlan_filter_bmp;
+
+	struct rte_ring *rx_ring;
 };
 
 extern const struct eth_dev_ops default_dev_ops;
-- 
2.18.0