+
static const char *valid_arguments[] = {
ETH_VHOST_IFACE_ARG,
ETH_VHOST_QUEUES_ARG,
@@ -49,6 +59,8 @@ static const char *valid_arguments[] = {
ETH_VHOST_LINEAR_BUF,
ETH_VHOST_EXT_BUF,
ETH_VHOST_LEGACY_OL_FLAGS,
+ ETH_VHOST_DMA_ARG,
+ ETH_VHOST_DMA_RING_SIZE,
NULL
};
@@ -80,8 +92,39 @@ struct vhost_queue {
struct vhost_stats stats;
int intr_enable;
rte_spinlock_t intr_lock;
+
+ /* Flag of enabling async data path */
+ bool async_register;
+ /* DMA device ID */
+ int16_t dma_id;
+ /**
+ * For a Rx queue, "txq" points to its peer Tx queue.
+ * For a Tx queue, "txq" is never used.
+ */
+ struct vhost_queue *txq;
+ /* Array to keep DMA completed packets */
+ struct rte_mbuf *cmpl_pkts[VHOST_MAX_PKT_BURST];
};
+struct dma_input_info {
+ int16_t dmas[RTE_MAX_QUEUES_PER_PORT * 2];
+ uint16_t dma_ring_size;
+};
+
+static int16_t configured_dmas[RTE_DMADEV_DEFAULT_MAX];
+static int dma_count;
+
+/**
+ * By default, its Rx path to call rte_vhost_poll_enqueue_completed() for
enqueue operations.
+ * However, Rx function is never been called in testpmd "txonly"
+mode, thus causing virtio
+ * cannot receive DMA completed packets. To make txonly mode work
+correctly, we provide a
+ * command in testpmd to call rte_vhost_poll_enqueue_completed() in Tx
path.
+ *
+ * When set async_tx_poll_completed to true, Tx path calls
+rte_vhost_poll_enqueue_completed();
+ * otherwise, Rx path calls it.
+ */
+bool async_tx_poll_completed;
+
struct pmd_internal {
rte_atomic32_t dev_attached;
char *iface_name;
@@ -94,6 +137,10 @@ struct pmd_internal {
bool vlan_strip;
bool rx_sw_csum;
bool tx_sw_csum;
+ struct {
+ int16_t dma_id;
+ bool async_register;
+ } queue_dmas[RTE_MAX_QUEUES_PER_PORT * 2];
};
struct internal_list {
@@ -124,6 +171,17 @@ struct rte_vhost_vring_state {
static struct rte_vhost_vring_state *vring_states[RTE_MAX_ETHPORTS];
+static bool
+dma_is_configured(int16_t dma_id)
+{
+ int i;
+
+ for (i = 0; i < dma_count; i++)
+ if (configured_dmas[i] == dma_id)
+ return true;
+ return false;
+}
+
static int
vhost_dev_xstats_reset(struct rte_eth_dev *dev)
{
@@ -396,15 +454,27 @@ vhost_dev_rx_sw_csum(struct rte_mbuf *mbuf)
mbuf->ol_flags |= RTE_MBUF_F_RX_L4_CKSUM_GOOD;
}
+static inline void
+vhost_tx_free_completed(int vid, uint16_t virtqueue_id, int16_t dma_id,
+ struct rte_mbuf **pkts, uint16_t count) {
+ uint16_t i, ret;
+
+ ret = rte_vhost_poll_enqueue_completed(vid, virtqueue_id, pkts,
count, dma_id, 0);
+ for (i = 0; likely(i < ret); i++)
+ rte_pktmbuf_free(pkts[i]);
+}
+
static uint16_t
eth_vhost_rx(void *q, struct rte_mbuf **bufs, uint16_t nb_bufs)
{
struct vhost_queue *r = q;
uint16_t i, nb_rx = 0;
uint16_t nb_receive = nb_bufs;
+ uint16_t nb_pkts, num;
if (unlikely(rte_atomic32_read(&r->allow_queuing) == 0))
- return 0;
+ goto tx_poll;
rte_atomic32_set(&r->while_queuing, 1);
@@ -412,19 +482,32 @@ eth_vhost_rx(void *q, struct rte_mbuf **bufs,
uint16_t nb_bufs)
goto out;
/* Dequeue packets from guest TX queue */
- while (nb_receive) {
- uint16_t nb_pkts;
- uint16_t num = (uint16_t)RTE_MIN(nb_receive,
- VHOST_MAX_PKT_BURST);
-
- nb_pkts = rte_vhost_dequeue_burst(r->vid, r->virtqueue_id,
- r->mb_pool, &bufs[nb_rx],
- num);
-
- nb_rx += nb_pkts;
- nb_receive -= nb_pkts;
- if (nb_pkts < num)
- break;
+ if (!r->async_register) {
+ while (nb_receive) {
+ num = (uint16_t)RTE_MIN(nb_receive,
VHOST_MAX_PKT_BURST);
+ nb_pkts = rte_vhost_dequeue_burst(r->vid, r-
virtqueue_id,
+ r->mb_pool, &bufs[nb_rx],
+ num);
+
+ nb_rx += nb_pkts;
+ nb_receive -= nb_pkts;
+ if (nb_pkts < num)
+ break;
+ }
+ } else {
+ int nr_inflight;
+
+ while (nb_receive) {
+ num = (uint16_t)RTE_MIN(nb_receive,
VHOST_MAX_PKT_BURST);
+ nb_pkts = rte_vhost_async_try_dequeue_burst(r-
vid, r->virtqueue_id,
+ r->mb_pool, &bufs[nb_rx],
num, &nr_inflight,
+ r->dma_id, 0);
+
+ nb_rx += nb_pkts;
+ nb_receive -= nb_pkts;
+ if (nb_pkts < num)
+ break;
+ }
}
r->stats.pkts += nb_rx;
@@ -445,6 +528,17 @@ eth_vhost_rx(void *q, struct rte_mbuf **bufs,
uint16_t nb_bufs)
out:
rte_atomic32_set(&r->while_queuing, 0);
+tx_poll:
+ /**
+ * Poll and free completed packets for the virtqueue of Tx queue.
+ * Note that we access Tx queue's virtqueue, which is protected
+ * by vring lock.
+ */
+ if (r->txq->async_register && !async_tx_poll_completed &&
+ rte_atomic32_read(&r->txq->allow_queuing) == 1)
+ vhost_tx_free_completed(r->vid, r->txq->virtqueue_id, r-
txq->dma_id,
+ r->cmpl_pkts, VHOST_MAX_PKT_BURST);
+
return nb_rx;
}
@@ -456,6 +550,7 @@ eth_vhost_tx(void *q, struct rte_mbuf **bufs,
uint16_t nb_bufs)
uint16_t nb_send = 0;
uint64_t nb_bytes = 0;
uint64_t nb_missed = 0;
+ uint16_t nb_pkts, num;
if (unlikely(rte_atomic32_read(&r->allow_queuing) == 0))
return 0;
@@ -486,31 +581,49 @@ eth_vhost_tx(void *q, struct rte_mbuf **bufs,
uint16_t nb_bufs)
}
/* Enqueue packets to guest RX queue */
- while (nb_send) {
- uint16_t nb_pkts;
- uint16_t num = (uint16_t)RTE_MIN(nb_send,
- VHOST_MAX_PKT_BURST);
+ if (!r->async_register) {
+ while (nb_send) {
+ num = (uint16_t)RTE_MIN(nb_send,
VHOST_MAX_PKT_BURST);
+ nb_pkts = rte_vhost_enqueue_burst(r->vid, r-
virtqueue_id,
+ &bufs[nb_tx], num);
+
+ nb_tx += nb_pkts;
+ nb_send -= nb_pkts;
+ if (nb_pkts < num)
+ break;
+ }
- nb_pkts = rte_vhost_enqueue_burst(r->vid, r->virtqueue_id,
- &bufs[nb_tx], num);
+ for (i = 0; likely(i < nb_tx); i++) {
+ nb_bytes += bufs[i]->pkt_len;
+ rte_pktmbuf_free(bufs[i]);
+ }
- nb_tx += nb_pkts;
- nb_send -= nb_pkts;
- if (nb_pkts < num)
- break;
- }
+ } else {
+ while (nb_send) {
+ num = (uint16_t)RTE_MIN(nb_send,
VHOST_MAX_PKT_BURST);
+ nb_pkts = rte_vhost_submit_enqueue_burst(r->vid,
r->virtqueue_id,
+ &bufs[nb_tx], num, r-
dma_id, 0);
+
+ nb_tx += nb_pkts;
+ nb_send -= nb_pkts;
+ if (nb_pkts < num)
+ break;
+ }
- for (i = 0; likely(i < nb_tx); i++)
- nb_bytes += bufs[i]->pkt_len;
+ for (i = 0; likely(i < nb_tx); i++)
+ nb_bytes += bufs[i]->pkt_len;
- nb_missed = nb_bufs - nb_tx;
+ if (unlikely(async_tx_poll_completed)) {
+ vhost_tx_free_completed(r->vid, r->virtqueue_id, r-
dma_id, r->cmpl_pkts,
+ VHOST_MAX_PKT_BURST);
+ }
+ }
+ nb_missed = nb_bufs - nb_tx;
r->stats.pkts += nb_tx;
r->stats.bytes += nb_bytes;
r->stats.missed_pkts += nb_missed;
- for (i = 0; likely(i < nb_tx); i++)
- rte_pktmbuf_free(bufs[i]);
out:
rte_atomic32_set(&r->while_queuing, 0);
@@ -798,6 +911,8 @@ queue_setup(struct rte_eth_dev *eth_dev, struct
pmd_internal *internal)
vq->vid = internal->vid;
vq->internal = internal;
vq->port = eth_dev->data->port_id;
+ if (i < eth_dev->data->nb_tx_queues)
+ vq->txq = eth_dev->data->tx_queues[i];
}
for (i = 0; i < eth_dev->data->nb_tx_queues; i++) {
vq = eth_dev->data->tx_queues[i];
@@ -878,6 +993,30 @@ new_device(int vid)
return 0;
}
+static inline void
+async_clear_virtqueue(int vid, uint16_t virtqueue_id, int16_t dma_id)
+{
+ struct rte_mbuf *pkts[VHOST_MAX_PKT_BURST];
+ uint16_t i, ret, nr_done = 0;
+
+ if (vid == -1)
+ return;
+
+ while (rte_vhost_async_get_inflight(vid, virtqueue_id) > 0) {
+ ret = rte_vhost_clear_queue(vid, virtqueue_id, pkts,
VHOST_MAX_PKT_BURST, dma_id,
+ 0);
+ for (i = 0; i < ret ; i++)
+ rte_pktmbuf_free(pkts[i]);
+
+ nr_done += ret;
+ }
+ VHOST_LOG(INFO, "Completed %u pkts for vid-%u vring-%u\n",
nr_done,
+vid, virtqueue_id);
+
+ if (rte_vhost_async_channel_unregister(vid, virtqueue_id))
+ VHOST_LOG(ERR, "Failed to unregister async for vid-%u
vring-%u\n", vid,
+ virtqueue_id);
+}
+
static void
destroy_device(int vid)
{
@@ -908,13 +1047,27 @@ destroy_device(int vid)
vq = eth_dev->data->rx_queues[i];
if (!vq)
continue;
+ if (vq->async_register) {
+ async_clear_virtqueue(vq->vid, vq-
virtqueue_id,
+ vq->dma_id);
+ vq->async_register = false;
+ internal->queue_dmas[vq-
virtqueue_id].async_register = false;
+ }
vq->vid = -1;
+
}
for (i = 0; i < eth_dev->data->nb_tx_queues; i++) {
vq = eth_dev->data->tx_queues[i];
if (!vq)
continue;
+ if (vq->async_register) {
+ async_clear_virtqueue(vq->vid, vq-
virtqueue_id,
+ vq->dma_id);
+ vq->async_register = false;
+ internal->queue_dmas[vq-
virtqueue_id].async_register = false;
+ }
vq->vid = -1;
+
}
}
@@ -983,6 +1136,9 @@ vring_state_changed(int vid, uint16_t vring, int
enable)
struct rte_vhost_vring_state *state;
struct rte_eth_dev *eth_dev;
struct internal_list *list;
+ struct vhost_queue *queue;
+ struct pmd_internal *internal;
+ int qid;
char ifname[PATH_MAX];
rte_vhost_get_ifname(vid, ifname, sizeof(ifname)); @@ -1011,6
+1167,65 @@ vring_state_changed(int vid, uint16_t vring, int enable)
update_queuing_status(eth_dev, false);
+ qid = vring / VIRTIO_QNUM;
+ if (vring % VIRTIO_QNUM == VIRTIO_RXQ)
+ queue = eth_dev->data->tx_queues[qid];
+ else
+ queue = eth_dev->data->rx_queues[qid];
+
+ if (!queue)
+ goto skip;
+
+ internal = eth_dev->data->dev_private;
+
+ /* Register async data path for the queue assigned valid DMA device
*/
+ if (internal->queue_dmas[queue->virtqueue_id].dma_id ==
INVALID_DMA_ID)
+ goto skip;
+
+ if (enable && !queue->async_register) {
+ if (rte_vhost_async_channel_register_thread_unsafe(vid,
vring)) {
+ VHOST_LOG(ERR, "Failed to register async for vid-%u
vring-%u!\n", vid,
+ vring);
+ return -1;
+ }
+
+ queue->async_register = true;
+ internal->queue_dmas[vring].async_register = true;
+
+ VHOST_LOG(INFO, "Succeed to register async for vid-%u
vring-%u\n", vid, vring);
+ }
+
+ if (!enable && queue->async_register) {
+ struct rte_mbuf *pkts[VHOST_MAX_PKT_BURST];
+ uint16_t ret, i, nr_done = 0;
+ uint16_t dma_id = queue->dma_id;
+
+ while (rte_vhost_async_get_inflight_thread_unsafe(vid,
vring) > 0) {
+ ret = rte_vhost_clear_queue_thread_unsafe(vid,
vring, pkts,
+ VHOST_MAX_PKT_BURST, dma_id, 0);
+
+ for (i = 0; i < ret ; i++)
+ rte_pktmbuf_free(pkts[i]);
+
+ nr_done += ret;
+ }
+
+ VHOST_LOG(INFO, "Completed %u in-flight pkts for vid-%u
vring-%u\n", nr_done, vid,
+ vring);
+
+ if (rte_vhost_async_channel_unregister_thread_unsafe(vid,
vring)) {
+ VHOST_LOG(ERR, "Failed to unregister async for vid-
%u vring-%u\n", vid,
+ vring);
+ return -1;
+ }
+
+ queue->async_register = false;
+ internal->queue_dmas[vring].async_register = false;
+
+ VHOST_LOG(INFO, "Succeed to unregister async for vid-%u
vring-%u\n", vid, vring);
+ }
+
+skip:
VHOST_LOG(INFO, "vring%u is %s\n",
vring, enable ? "enabled" : "disabled");
@@ -1159,6 +1374,12 @@ rte_eth_vhost_get_vid_from_port_id(uint16_t
port_id)
return vid;
}
+void
+rte_eth_vhost_async_tx_poll_completed(bool enable) {
+ async_tx_poll_completed = enable;
+}
+
static int
eth_dev_configure(struct rte_eth_dev *dev)
{
@@ -1220,6 +1441,7 @@ eth_dev_close(struct rte_eth_dev *dev)
{
struct pmd_internal *internal;
struct internal_list *list;
+ struct vhost_queue *queue;
unsigned int i, ret;
if (rte_eal_process_type() != RTE_PROC_PRIMARY) @@ -1233,6
+1455,25
@@ eth_dev_close(struct rte_eth_dev *dev)
list = find_internal_resource(internal->iface_name);
if (list) {
+ /* Make sure all in-flight packets are completed before
destroy vhost */
+ if (dev->data->rx_queues) {
+ for (i = 0; i < dev->data->nb_rx_queues; i++) {
+ queue = dev->data->rx_queues[i];
+ if (queue->async_register)
+ async_clear_virtqueue(queue->vid,
queue->virtqueue_id,
+ queue->dma_id);
+ }
+ }
+
+ if (dev->data->tx_queues) {
+ for (i = 0; i < dev->data->nb_tx_queues; i++) {
+ queue = dev->data->tx_queues[i];
+ if (queue->async_register)
+ async_clear_virtqueue(queue->vid,
queue->virtqueue_id,
+ queue->dma_id);
+ }
+ }
+
rte_vhost_driver_unregister(internal->iface_name);
pthread_mutex_lock(&internal_list_lock);
TAILQ_REMOVE(&internal_list, list, next); @@ -1267,6
+1508,7 @@
eth_rx_queue_setup(struct rte_eth_dev *dev, uint16_t rx_queue_id,
struct rte_mempool *mb_pool)
{
struct vhost_queue *vq;
+ struct pmd_internal *internal = dev->data->dev_private;
vq = rte_zmalloc_socket(NULL, sizeof(struct vhost_queue),
RTE_CACHE_LINE_SIZE, socket_id);
@@ -1277,6 +1519,8 @@ eth_rx_queue_setup(struct rte_eth_dev *dev,
uint16_t rx_queue_id,
vq->mb_pool = mb_pool;
vq->virtqueue_id = rx_queue_id * VIRTIO_QNUM + VIRTIO_TXQ;
+ vq->async_register = internal->queue_dmas[vq-
virtqueue_id].async_register;
+ vq->dma_id = internal->queue_dmas[vq->virtqueue_id].dma_id;
rte_spinlock_init(&vq->intr_lock);
dev->data->rx_queues[rx_queue_id] = vq;
@@ -1290,6 +1534,7 @@ eth_tx_queue_setup(struct rte_eth_dev *dev,
uint16_t tx_queue_id,
const struct rte_eth_txconf *tx_conf __rte_unused)
{
struct vhost_queue *vq;
+ struct pmd_internal *internal = dev->data->dev_private;
vq = rte_zmalloc_socket(NULL, sizeof(struct vhost_queue),
RTE_CACHE_LINE_SIZE, socket_id);
@@ -1299,6 +1544,8 @@ eth_tx_queue_setup(struct rte_eth_dev *dev,
uint16_t tx_queue_id,
}
vq->virtqueue_id = tx_queue_id * VIRTIO_QNUM + VIRTIO_RXQ;
+ vq->async_register = internal->queue_dmas[vq-
virtqueue_id].async_register;
+ vq->dma_id = internal->queue_dmas[vq->virtqueue_id].dma_id;
rte_spinlock_init(&vq->intr_lock);
dev->data->tx_queues[tx_queue_id] = vq;
@@ -1509,13 +1756,14 @@ static const struct eth_dev_ops ops = {
static int
eth_dev_vhost_create(struct rte_vdev_device *dev, char *iface_name,
int16_t queues, const unsigned int numa_node, uint64_t flags,
- uint64_t disable_flags)
+ uint64_t disable_flags, struct dma_input_info *dma_input)
{
const char *name = rte_vdev_device_name(dev);
struct rte_eth_dev_data *data;
struct pmd_internal *internal = NULL;
struct rte_eth_dev *eth_dev = NULL;
struct rte_ether_addr *eth_addr = NULL;
+ int i;
VHOST_LOG(INFO, "Creating VHOST-USER backend on numa
socket %u\n",
numa_node);
@@ -1564,6 +1812,12 @@ eth_dev_vhost_create(struct rte_vdev_device
*dev, char *iface_name,
eth_dev->rx_pkt_burst = eth_vhost_rx;
eth_dev->tx_pkt_burst = eth_vhost_tx;
+ for (i = 0; i < RTE_MAX_QUEUES_PER_PORT * 2; i++) {
+ /* Invalid DMA ID indicates the queue does not want to
enable async data path */
+ internal->queue_dmas[i].dma_id = dma_input->dmas[i];
+ internal->queue_dmas[i].async_register = false;
+ }
+
rte_eth_dev_probing_finish(eth_dev);
return 0;
@@ -1603,6 +1857,155 @@ open_int(const char *key __rte_unused, const
char *value, void *extra_args)
return 0;
}
+static int
+init_dma(int16_t dma_id, uint16_t ring_size) {
+ struct rte_dma_info info;
+ struct rte_dma_conf dev_config = { .nb_vchans = 1 };
+ struct rte_dma_vchan_conf qconf = {
+ .direction = RTE_DMA_DIR_MEM_TO_MEM,
+ };
+ int ret = 0;
+
+ if (dma_is_configured(dma_id))
+ goto out;
+
+ if (rte_dma_info_get(dma_id, &info) != 0) {
+ VHOST_LOG(ERR, "dma %u get info failed\n", dma_id);
+ ret = -1;
+ goto out;
+ }
+
+ if (info.max_vchans < 1) {
+ VHOST_LOG(ERR, "No channels available on dma %d\n",
dma_id);
+ ret = -1;
+ goto out;
+ }
+
+ if (rte_dma_configure(dma_id, &dev_config) != 0) {
+ VHOST_LOG(ERR, "dma %u configure failed\n", dma_id);
+ ret = -1;
+ goto out;
+ }
+
+ rte_dma_info_get(dma_id, &info);
+ if (info.nb_vchans != 1) {
+ VHOST_LOG(ERR, "dma %u has no queues\n", dma_id);
+ ret = -1;
+ goto out;
+ }
+
+ ring_size = RTE_MAX(ring_size, MINIMUM_DMA_RING_SIZE);
+ ring_size = RTE_MAX(ring_size, info.min_desc);
+ qconf.nb_desc = RTE_MIN(ring_size, info.max_desc);
+ if (rte_dma_vchan_setup(dma_id, 0, &qconf) != 0) {
+ VHOST_LOG(ERR, "dma %u queue setup failed\n", dma_id);
+ ret = -1;
+ goto out;
+ }
+
+ if (rte_dma_start(dma_id) != 0) {
+ VHOST_LOG(ERR, "dma %u start failed\n", dma_id);
+ ret = -1;
+ goto out;
+ }
+
+ configured_dmas[dma_count++] = dma_id;
+
+out:
+ return ret;
+}
+
+static int
+open_dma(const char *key __rte_unused, const char *value, void
+*extra_args) {
+ struct dma_input_info *dma_input = extra_args;
+ char *input = strndup(value, strlen(value) + 1);
+ char *addrs = input;
+ char *ptrs[2];
+ char *start, *end, *substr;
+ uint16_t qid, virtqueue_id;
+ int16_t dma_id;
+ int i, ret = 0;
+
+ while (isblank(*addrs))
+ addrs++;
+ if (*addrs == '\0') {
+ VHOST_LOG(ERR, "No input DMA addresses\n");
+ ret = -1;
+ goto out;
+ }
+
+ /* process DMA devices within bracket. */
+ addrs++;
+ substr = strtok(addrs, ";]");
+ if (!substr) {
+ VHOST_LOG(ERR, "No input DMA addresse\n");
+ ret = -1;
+ goto out;
+ }
+
+ do {
+ rte_strsplit(substr, strlen(substr), ptrs, 2, '@');
+
+ char *txq, *rxq;
+ bool is_txq;
+
+ txq = strstr(ptrs[0], "txq");
+ rxq = strstr(ptrs[0], "rxq");
+ if (txq == NULL && rxq == NULL) {
+ VHOST_LOG(ERR, "Illegal queue\n");
+ ret = -1;
+ goto out;
+ } else if (txq) {
+ is_txq = true;
+ start = txq;
+ } else {
+ is_txq = false;
+ start = rxq;
+ }
+
+ start += 3;
+ qid = strtol(start, &end, 0);
+ if (end == start) {
+ VHOST_LOG(ERR, "No input queue ID\n");
+ ret = -1;
+ goto out;
+ }
+
+ virtqueue_id = is_txq ? qid * 2 + VIRTIO_RXQ : qid * 2 +
+VIRTIO_TXQ;
+
+ dma_id = rte_dma_get_dev_id_by_name(ptrs[1]);
+ if (dma_id < 0) {
+ VHOST_LOG(ERR, "Fail to find DMA device %s.\n",
ptrs[1]);
+ ret = -1;
+ goto out;
+ }
+
+ ret = init_dma(dma_id, dma_input->dma_ring_size);
+ if (ret != 0) {
+ VHOST_LOG(ERR, "Fail to initialize DMA %u\n",
dma_id);
+ ret = -1;
+ break;
+ }
+
+ dma_input->dmas[virtqueue_id] = dma_id;
+
+ substr = strtok(NULL, ";]");
+ } while (substr);
+
+ for (i = 0; i < dma_count; i++) {
+ if (rte_vhost_async_dma_configure(configured_dmas[i], 0) <
0) {
+ VHOST_LOG(ERR, "Fail to configure DMA %u to
vhost\n", configured_dmas[i]);
+ ret = -1;
+ }
+ }
+
+out:
+ free(input);
+ return ret;
+}
+
static int
rte_pmd_vhost_probe(struct rte_vdev_device *dev)
{
@@ -1621,6 +2024,10 @@ rte_pmd_vhost_probe(struct rte_vdev_device
*dev)
int legacy_ol_flags = 0;
struct rte_eth_dev *eth_dev;
const char *name = rte_vdev_device_name(dev);
+ struct dma_input_info dma_input;
+
+ memset(dma_input.dmas, INVALID_DMA_ID,
sizeof(dma_input.dmas));
+ dma_input.dma_ring_size = DEFAULT_DMA_RING_SIZE;
VHOST_LOG(INFO, "Initializing pmd_vhost for %s\n", name);
@@ -1736,6 +2143,43 @@ rte_pmd_vhost_probe(struct rte_vdev_device
*dev)
goto out_free;
}
+ if (rte_kvargs_count(kvlist, ETH_VHOST_DMA_RING_SIZE) == 1) {
+ if (rte_kvargs_count(kvlist, ETH_VHOST_DMA_ARG) == 1) {
+ ret = rte_kvargs_process(kvlist,
ETH_VHOST_DMA_RING_SIZE,
+ &open_int,
&dma_input.dma_ring_size);
+ if (ret < 0)
+ goto out_free;
+
+ if (!rte_is_power_of_2(dma_input.dma_ring_size)) {
+ dma_input.dma_ring_size =
rte_align32pow2(dma_input.dma_ring_size);
+ VHOST_LOG(INFO, "Convert dma_ring_size to
the power of two %u\n",
+ dma_input.dma_ring_size);
+ }
+ } else {
+ VHOST_LOG(WARNING, "%s is not specified, skip to
parse %s\n",
+ ETH_VHOST_DMA_ARG,
ETH_VHOST_DMA_RING_SIZE);
+ }
+ }
+
+ if (rte_kvargs_count(kvlist, ETH_VHOST_DMA_ARG) == 1) {
+ if (rte_kvargs_count(kvlist, ETH_VHOST_DMA_RING_SIZE) ==
0)
+ VHOST_LOG(INFO, "Use default dma ring size %d\n",
+DEFAULT_DMA_RING_SIZE);
+
+ ret = rte_kvargs_process(kvlist, ETH_VHOST_DMA_ARG,
+ &open_dma, &dma_input);
+ if (ret < 0) {
+ VHOST_LOG(ERR, "Failed to parse %s\n",
ETH_VHOST_DMA_ARG);
+ goto out_free;
+ }
+
+ flags |= RTE_VHOST_USER_ASYNC_COPY;
+ /**
+ * Don't support live migration when enable
+ * DMA acceleration.
+ */
+ disable_flags |= (1ULL << VHOST_F_LOG_ALL);
+ }
+
if (legacy_ol_flags == 0)
flags |= RTE_VHOST_USER_NET_COMPLIANT_OL_FLAGS;
@@ -1743,7 +2187,7 @@ rte_pmd_vhost_probe(struct rte_vdev_device
*dev)
dev->device.numa_node = rte_socket_id();
ret = eth_dev_vhost_create(dev, iface_name, queues,
- dev->device.numa_node, flags,
disable_flags);
+ dev->device.numa_node, flags, disable_flags,
&dma_input);
if (ret == -1)
VHOST_LOG(ERR, "Failed to create %s\n", name);
@@ -1787,4 +2231,6 @@ RTE_PMD_REGISTER_PARAM_STRING(net_vhost,
"postcopy-support=<0|1> "
"tso=<0|1> "
"linear-buffer=<0|1> "
- "ext-buffer=<0|1>");
+ "ext-buffer=<0|1> "
+ "dma-ring-size=<int> "
+ "dmas=[txq0@dma_addr;rxq0@dma_addr]");
diff --git a/drivers/net/vhost/rte_eth_vhost.h
b/drivers/net/vhost/rte_eth_vhost.h
index 0e68b9f668..146c98803d 100644
--- a/drivers/net/vhost/rte_eth_vhost.h
+++ b/drivers/net/vhost/rte_eth_vhost.h
@@ -52,6 +52,21 @@ int rte_eth_vhost_get_queue_event(uint16_t port_id,
*/
int rte_eth_vhost_get_vid_from_port_id(uint16_t port_id);
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change, or be removed, without prior
+notice
+ *
+ * By default, rte_vhost_poll_enqueue_completed() is called in Rx path.
+ * This function enables Tx path, rather than Rx path, to poll
+completed
+ * packets for vhost async enqueue operations. Note that virtio may
+never
+ * receive DMA completed packets if there are no more Tx operations.
+ *
+ * @param enable
+ * True indicates Tx path to call rte_vhost_poll_enqueue_completed().
+ */
+__rte_experimental
+void rte_eth_vhost_async_tx_poll_completed(bool enable);
+
#ifdef __cplusplus
}
#endif
diff --git a/drivers/net/vhost/version.map
b/drivers/net/vhost/version.map index e42c89f1eb..0a40441227 100644
--- a/drivers/net/vhost/version.map
+++ b/drivers/net/vhost/version.map
@@ -6,3 +6,10 @@ DPDK_23 {
local: *;
};
+
+EXPERIMENTAL {
+ global:
+
+ # added in 22.11
+ rte_eth_vhost_async_tx_poll_completed;
I'm not in favor of adding driver-specific API.
IMHO, you should just decide whether doing completion on Tx or Rx path
and stick with it.
Doing completion on the Tx path not being reliable (i.e. if not other packets
are sent, last enqueued packets are not completed), I guess only doing
completion in Rx path is the right thing to do.
