Sample vhost leverage the VMDq+RSS in HW to receive packets and distribute them
into different queue in the pool according to their 5 tuples.
On the other hand, it enables multiple queues mode in vhost/virtio layer.
HW queue numbers in pool is required to be exactly same with the queue number
in virtio
device, e.g. rxq = 4, the queue number is 4, it means 4 HW queues in each VMDq
pool,
and 4 queues in each virtio device/port, every queue in pool maps to one queue
of its
virtio device.
=========================================
==================| |==================|
vport0 | | vport1 |
--- --- --- ---| |--- --- --- ---|
q0 | q1 | q2 | q3 | |q0 | q1 | q2 | q3 |
/\= =/\= =/\= =/\=| |/\= =/\= =/\= =/\=|
|| || || || || || || ||
|| || || || || || || ||
||= =||= =||= =||=| =||== ||== ||== ||=|
q0 | q1 | q2 | q3 | |q0 | q1 | q2 | q3 |
------------------| |------------------|
VMDq pool0 | | VMDq pool1 |
==================| |==================|
In RX side, it firstly polls each queue of the pool and gets the packets from
it and enqueue them into its corresponding queue in virtio device/port.
In TX side, it dequeue packets from each queue of virtio device/port and send
to either physical port or another virtio device according to its destination
MAC address.
Signed-off-by: Changchun Ouyang <changchun.ouyang at intel.com>
---
examples/vhost/main.c | 132 ++++++++++++++++++++++++++++++--------------------
1 file changed, 79 insertions(+), 53 deletions(-)
diff --git a/examples/vhost/main.c b/examples/vhost/main.c
index 6a38b42..f70eff8 100644
--- a/examples/vhost/main.c
+++ b/examples/vhost/main.c
@@ -999,8 +999,9 @@ link_vmdq(struct vhost_dev *vdev, struct rte_mbuf *m)
/* Enable stripping of the vlan tag as we handle routing. */
if (vlan_strip)
- rte_eth_dev_set_vlan_strip_on_queue(ports[0],
- (uint16_t)vdev->vmdq_rx_q, 1);
+ for (i = 0; i < (int)rxq; i++)
+ rte_eth_dev_set_vlan_strip_on_queue(ports[0],
+ (uint16_t)(vdev->vmdq_rx_q + i), 1);
/* Set device as ready for RX. */
vdev->ready = DEVICE_RX;
@@ -1015,7 +1016,7 @@ link_vmdq(struct vhost_dev *vdev, struct rte_mbuf *m)
static inline void
unlink_vmdq(struct vhost_dev *vdev)
{
- unsigned i = 0;
+ unsigned i = 0, j = 0;
unsigned rx_count;
struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
@@ -1028,15 +1029,19 @@ unlink_vmdq(struct vhost_dev *vdev)
vdev->vlan_tag = 0;
/*Clear out the receive buffers*/
- rx_count = rte_eth_rx_burst(ports[0],
- (uint16_t)vdev->vmdq_rx_q, pkts_burst,
MAX_PKT_BURST);
+ for (i = 0; i < rxq; i++) {
+ rx_count = rte_eth_rx_burst(ports[0],
+ (uint16_t)vdev->vmdq_rx_q + i,
+ pkts_burst, MAX_PKT_BURST);
- while (rx_count) {
- for (i = 0; i < rx_count; i++)
- rte_pktmbuf_free(pkts_burst[i]);
+ while (rx_count) {
+ for (j = 0; j < rx_count; j++)
+ rte_pktmbuf_free(pkts_burst[j]);
- rx_count = rte_eth_rx_burst(ports[0],
- (uint16_t)vdev->vmdq_rx_q, pkts_burst,
MAX_PKT_BURST);
+ rx_count = rte_eth_rx_burst(ports[0],
+ (uint16_t)vdev->vmdq_rx_q + i,
+ pkts_burst, MAX_PKT_BURST);
+ }
}
vdev->ready = DEVICE_MAC_LEARNING;
@@ -1048,7 +1053,7 @@ unlink_vmdq(struct vhost_dev *vdev)
* the packet on that devices RX queue. If not then return.
*/
static inline int __attribute__((always_inline))
-virtio_tx_local(struct vhost_dev *vdev, struct rte_mbuf *m)
+virtio_tx_local(struct vhost_dev *vdev, struct rte_mbuf *m, uint32_t q_idx)
{
struct virtio_net_data_ll *dev_ll;
struct ether_hdr *pkt_hdr;
@@ -1063,7 +1068,7 @@ virtio_tx_local(struct vhost_dev *vdev, struct rte_mbuf
*m)
while (dev_ll != NULL) {
if ((dev_ll->vdev->ready == DEVICE_RX) &&
ether_addr_cmp(&(pkt_hdr->d_addr),
- &dev_ll->vdev->mac_address)) {
+ &dev_ll->vdev->mac_address)) {
/* Drop the packet if the TX packet is destined for the
TX device. */
if (dev_ll->vdev->dev->device_fh == dev->device_fh) {
@@ -1081,7 +1086,9 @@ virtio_tx_local(struct vhost_dev *vdev, struct rte_mbuf
*m)
LOG_DEBUG(VHOST_DATA, "(%"PRIu64") Device is
marked for removal\n", tdev->device_fh);
} else {
/*send the packet to the local virtio device*/
- ret = rte_vhost_enqueue_burst(tdev, VIRTIO_RXQ,
&m, 1);
+ ret = rte_vhost_enqueue_burst(tdev,
+ VIRTIO_RXQ + q_idx * VIRTIO_QNUM,
+ &m, 1);
if (enable_stats) {
rte_atomic64_add(
&dev_statistics[tdev->device_fh].rx_total_atomic,
@@ -1158,7 +1165,8 @@ find_local_dest(struct virtio_net *dev, struct rte_mbuf
*m,
* or the physical port.
*/
static inline void __attribute__((always_inline))
-virtio_tx_route(struct vhost_dev *vdev, struct rte_mbuf *m, uint16_t vlan_tag)
+virtio_tx_route(struct vhost_dev *vdev, struct rte_mbuf *m,
+ uint16_t vlan_tag, uint32_t q_idx)
{
struct mbuf_table *tx_q;
struct rte_mbuf **m_table;
@@ -1168,7 +1176,8 @@ virtio_tx_route(struct vhost_dev *vdev, struct rte_mbuf
*m, uint16_t vlan_tag)
struct ether_hdr *nh;
/*check if destination is local VM*/
- if ((vm2vm_mode == VM2VM_SOFTWARE) && (virtio_tx_local(vdev, m) == 0)) {
+ if ((vm2vm_mode == VM2VM_SOFTWARE) &&
+ (virtio_tx_local(vdev, m, q_idx) == 0)) {
rte_pktmbuf_free(m);
return;
}
@@ -1332,49 +1341,60 @@ switch_worker(__attribute__((unused)) void *arg)
}
if (likely(vdev->ready == DEVICE_RX)) {
/*Handle guest RX*/
- rx_count = rte_eth_rx_burst(ports[0],
- vdev->vmdq_rx_q, pkts_burst,
MAX_PKT_BURST);
+ for (i = 0; i < rxq; i ++) {
+ rx_count = rte_eth_rx_burst(ports[0],
+ vdev->vmdq_rx_q + i,
pkts_burst, MAX_PKT_BURST);
- if (rx_count) {
- /*
- * Retry is enabled and the queue is
full then we wait and retry to avoid packet loss
- * Here MAX_PKT_BURST must be less than
virtio queue size
- */
- if (enable_retry && unlikely(rx_count >
rte_vring_available_entries(dev, VIRTIO_RXQ))) {
- for (retry = 0; retry <
burst_rx_retry_num; retry++) {
-
rte_delay_us(burst_rx_delay_time);
- if (rx_count <=
rte_vring_available_entries(dev, VIRTIO_RXQ))
- break;
+ if (rx_count) {
+ /*
+ * Retry is enabled and the
queue is full then we wait and retry to avoid packet loss
+ * Here MAX_PKT_BURST must be
less than virtio queue size
+ */
+ if (enable_retry &&
unlikely(rx_count > rte_vring_available_entries(dev,
+
VIRTIO_RXQ + i * VIRTIO_QNUM))) {
+ for (retry = 0; retry <
burst_rx_retry_num; retry++) {
+
rte_delay_us(burst_rx_delay_time);
+ if (rx_count <=
rte_vring_available_entries(dev,
+
VIRTIO_RXQ + i * VIRTIO_QNUM))
+ break;
+ }
+ }
+ ret_count =
rte_vhost_enqueue_burst(dev, VIRTIO_RXQ + i * VIRTIO_QNUM,
+
pkts_burst, rx_count);
+ if (enable_stats) {
+ rte_atomic64_add(
+
&dev_statistics[dev_ll->vdev->dev->device_fh].rx_total_atomic,
+ rx_count);
+ rte_atomic64_add(
+
&dev_statistics[dev_ll->vdev->dev->device_fh].rx_atomic, ret_count);
+ }
+ while (likely(rx_count)) {
+ rx_count--;
+
rte_pktmbuf_free(pkts_burst[rx_count]);
}
}
- ret_count =
rte_vhost_enqueue_burst(dev, VIRTIO_RXQ, pkts_burst, rx_count);
- if (enable_stats) {
- rte_atomic64_add(
-
&dev_statistics[dev_ll->vdev->dev->device_fh].rx_total_atomic,
- rx_count);
- rte_atomic64_add(
-
&dev_statistics[dev_ll->vdev->dev->device_fh].rx_atomic, ret_count);
- }
- while (likely(rx_count)) {
- rx_count--;
-
rte_pktmbuf_free(pkts_burst[rx_count]);
- }
-
}
}
if (likely(!vdev->remove)) {
/* Handle guest TX*/
- tx_count = rte_vhost_dequeue_burst(dev,
VIRTIO_TXQ, mbuf_pool, pkts_burst, MAX_PKT_BURST);
- /* If this is the first received packet we need
to learn the MAC and setup VMDQ */
- if (unlikely(vdev->ready ==
DEVICE_MAC_LEARNING) && tx_count) {
- if (vdev->remove || (link_vmdq(vdev,
pkts_burst[0]) == -1)) {
- while (tx_count)
-
rte_pktmbuf_free(pkts_burst[--tx_count]);
+ for (i = 0; i < rxq; i++) {
+ tx_count = rte_vhost_dequeue_burst(dev,
VIRTIO_TXQ + i * 2,
+ mbuf_pool, pkts_burst,
MAX_PKT_BURST);
+ /*
+ * If this is the first received packet
we need to learn
+ * the MAC and setup VMDQ
+ */
+ if (unlikely(vdev->ready ==
DEVICE_MAC_LEARNING) && tx_count) {
+ if (vdev->remove ||
(link_vmdq(vdev, pkts_burst[0]) == -1)) {
+ while (tx_count)
+
rte_pktmbuf_free(pkts_burst[--tx_count]);
+ }
}
+ while (tx_count)
+ virtio_tx_route(vdev,
pkts_burst[--tx_count],
+
(uint16_t)dev->device_fh, i);
}
- while (tx_count)
- virtio_tx_route(vdev,
pkts_burst[--tx_count], (uint16_t)dev->device_fh);
}
/*move to the next device in the list*/
@@ -2678,12 +2698,12 @@ new_device (struct virtio_net *dev)
}
}
-
/* Add device to main ll */
ll_dev = get_data_ll_free_entry(&ll_root_free);
if (ll_dev == NULL) {
- RTE_LOG(INFO, VHOST_DATA, "(%"PRIu64") No free entry found in
linked list. Device limit "
- "of %d devices per core has been reached\n",
+ RTE_LOG(INFO, VHOST_DATA,
+ "(%"PRIu64") No free entry found in linked list."
+ "Device limit of %d devices per core has been
reached\n",
dev->device_fh, num_devices);
if (vdev->regions_hpa)
rte_free(vdev->regions_hpa);
@@ -2692,8 +2712,12 @@ new_device (struct virtio_net *dev)
}
ll_dev->vdev = vdev;
add_data_ll_entry(&ll_root_used, ll_dev);
- vdev->vmdq_rx_q
- = dev->device_fh * queues_per_pool + vmdq_queue_base;
+ vdev->vmdq_rx_q = dev->device_fh * rxq + vmdq_queue_base;
+
+ if ((rxq > 1) && (queues_per_pool != rxq)) {
+ RTE_LOG(INFO, VHOST_DATA, "(%"PRIu64") rxq: %d !=
queues_per_pool: %d \n",
+ dev->device_fh, rxq, queues_per_pool);
+ }
if (zero_copy) {
uint32_t index = vdev->vmdq_rx_q;
@@ -2944,6 +2968,8 @@ main(int argc, char *argv[])
if (ret < 0)
rte_exit(EXIT_FAILURE, "Invalid argument\n");
+ rte_vhost_q_num_get(rxq);
+
for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id ++)
if (rte_lcore_is_enabled(lcore_id))
lcore_ids[core_id ++] = lcore_id;
--
1.8.4.2
