#define PRINT_PACKET(device, addr, size, header) do{} while(0)
#endif
-/*
- * Function to convert guest physical addresses to vhost virtual addresses. This
- * is used to convert virtio buffer addresses.
- */
-static inline uint64_t __attribute__((always_inline))
-gpa_to_vva(struct virtio_net *dev, uint64_t guest_pa)
-{
- struct virtio_memory_regions *region;
- uint32_t regionidx;
- uint64_t vhost_va = 0;
-
- for (regionidx = 0; regionidx < dev->mem->nregions; regionidx++) {
- region = &dev->mem->regions[regionidx];
- if ((guest_pa >= region->guest_phys_address) &&
- (guest_pa <= region->guest_phys_address_end)) {
- vhost_va = region->address_offset + guest_pa;
- break;
- }
- }
- LOG_DEBUG(VHOST_DATA, "(%"PRIu64") GPA %p| VVA %p\n",
- dev->device_fh, (void*)(uintptr_t)guest_pa, (void*)(uintptr_t)vhost_va);
-
- return vhost_va;
-}
-
/*
* Function to convert guest physical addresses to vhost physical addresses.
* This is used to convert virtio buffer addresses.
return vhost_pa;
}
-/*
- * This function adds buffers to the virtio devices RX virtqueue. Buffers can
- * be received from the physical port or from another virtio device. A packet
- * count is returned to indicate the number of packets that were succesfully
- * added to the RX queue. This function works when mergeable is disabled.
- */
-static inline uint32_t __attribute__((always_inline))
-virtio_dev_rx(struct virtio_net *dev, struct rte_mbuf **pkts, uint32_t count)
-{
- struct vhost_virtqueue *vq;
- struct vring_desc *desc;
- struct rte_mbuf *buff;
- /* The virtio_hdr is initialised to 0. */
- struct virtio_net_hdr_mrg_rxbuf virtio_hdr = {{0,0,0,0,0,0},0};
- uint64_t buff_addr = 0;
- uint64_t buff_hdr_addr = 0;
- uint32_t head[MAX_PKT_BURST], packet_len = 0;
- uint32_t head_idx, packet_success = 0;
- uint32_t retry = 0;
- uint16_t avail_idx, res_cur_idx;
- uint16_t res_base_idx, res_end_idx;
- uint16_t free_entries;
- uint8_t success = 0;
-
- LOG_DEBUG(VHOST_DATA, "(%"PRIu64") virtio_dev_rx()\n", dev->device_fh);
- vq = dev->virtqueue[VIRTIO_RXQ];
- count = (count > MAX_PKT_BURST) ? MAX_PKT_BURST : count;
-
- /* As many data cores may want access to available buffers, they need to be reserved. */
- do {
- res_base_idx = vq->last_used_idx_res;
- avail_idx = *((volatile uint16_t *)&vq->avail->idx);
-
- free_entries = (avail_idx - res_base_idx);
- /* If retry is enabled and the queue is full then we wait and retry to avoid packet loss. */
- if (enable_retry && unlikely(count > free_entries)) {
- for (retry = 0; retry < burst_rx_retry_num; retry++) {
- rte_delay_us(burst_rx_delay_time);
- avail_idx =
- *((volatile uint16_t *)&vq->avail->idx);
- free_entries = (avail_idx - res_base_idx);
- if (count <= free_entries)
- break;
- }
- }
-
- /*check that we have enough buffers*/
- if (unlikely(count > free_entries))
- count = free_entries;
-
- if (count == 0)
- return 0;
-
- res_end_idx = res_base_idx + count;
- /* vq->last_used_idx_res is atomically updated. */
- success = rte_atomic16_cmpset(&vq->last_used_idx_res, res_base_idx,
- res_end_idx);
- } while (unlikely(success == 0));
- res_cur_idx = res_base_idx;
- LOG_DEBUG(VHOST_DATA, "(%"PRIu64") Current Index %d| End Index %d\n", dev->device_fh, res_cur_idx, res_end_idx);
-
- /* Prefetch available ring to retrieve indexes. */
- rte_prefetch0(&vq->avail->ring[res_cur_idx & (vq->size - 1)]);
-
- /* Retrieve all of the head indexes first to avoid caching issues. */
- for (head_idx = 0; head_idx < count; head_idx++)
- head[head_idx] = vq->avail->ring[(res_cur_idx + head_idx) & (vq->size - 1)];
-
- /*Prefetch descriptor index. */
- rte_prefetch0(&vq->desc[head[packet_success]]);
-
- while (res_cur_idx != res_end_idx) {
- /* Get descriptor from available ring */
- desc = &vq->desc[head[packet_success]];
-
- buff = pkts[packet_success];
-
- /* Convert from gpa to vva (guest physical addr -> vhost virtual addr) */
- buff_addr = gpa_to_vva(dev, desc->addr);
- /* Prefetch buffer address. */
- rte_prefetch0((void*)(uintptr_t)buff_addr);
-
- /* Copy virtio_hdr to packet and increment buffer address */
- buff_hdr_addr = buff_addr;
- packet_len = rte_pktmbuf_data_len(buff) + vq->vhost_hlen;
-
- /*
- * If the descriptors are chained the header and data are
- * placed in separate buffers.
- */
- if (desc->flags & VRING_DESC_F_NEXT) {
- desc->len = vq->vhost_hlen;
- desc = &vq->desc[desc->next];
- /* Buffer address translation. */
- buff_addr = gpa_to_vva(dev, desc->addr);
- desc->len = rte_pktmbuf_data_len(buff);
- } else {
- buff_addr += vq->vhost_hlen;
- desc->len = packet_len;
- }
-
- /* Update used ring with desc information */
- vq->used->ring[res_cur_idx & (vq->size - 1)].id = head[packet_success];
- vq->used->ring[res_cur_idx & (vq->size - 1)].len = packet_len;
-
- /* Copy mbuf data to buffer */
- rte_memcpy((void *)(uintptr_t)buff_addr,
- rte_pktmbuf_mtod(buff, const void *),
- rte_pktmbuf_data_len(buff));
- PRINT_PACKET(dev, (uintptr_t)buff_addr,
- rte_pktmbuf_data_len(buff), 0);
-
- res_cur_idx++;
- packet_success++;
-
- rte_memcpy((void *)(uintptr_t)buff_hdr_addr,
- (const void *)&virtio_hdr, vq->vhost_hlen);
-
- PRINT_PACKET(dev, (uintptr_t)buff_hdr_addr, vq->vhost_hlen, 1);
-
- if (res_cur_idx < res_end_idx) {
- /* Prefetch descriptor index. */
- rte_prefetch0(&vq->desc[head[packet_success]]);
- }
- }
-
- rte_compiler_barrier();
-
- /* Wait until it's our turn to add our buffer to the used ring. */
- while (unlikely(vq->last_used_idx != res_base_idx))
- rte_pause();
-
- *(volatile uint16_t *)&vq->used->idx += count;
- vq->last_used_idx = res_end_idx;
-
- /* Kick the guest if necessary. */
- if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT))
- eventfd_write((int)vq->kickfd, 1);
- return count;
-}
-
-static inline uint32_t __attribute__((always_inline))
-copy_from_mbuf_to_vring(struct virtio_net *dev,
- uint16_t res_base_idx, uint16_t res_end_idx,
- struct rte_mbuf *pkt)
-{
- uint32_t vec_idx = 0;
- uint32_t entry_success = 0;
- struct vhost_virtqueue *vq;
- /* The virtio_hdr is initialised to 0. */
- struct virtio_net_hdr_mrg_rxbuf virtio_hdr = {
- {0, 0, 0, 0, 0, 0}, 0};
- uint16_t cur_idx = res_base_idx;
- uint64_t vb_addr = 0;
- uint64_t vb_hdr_addr = 0;
- uint32_t seg_offset = 0;
- uint32_t vb_offset = 0;
- uint32_t seg_avail;
- uint32_t vb_avail;
- uint32_t cpy_len, entry_len;
-
- if (pkt == NULL)
- return 0;
-
- LOG_DEBUG(VHOST_DATA, "(%"PRIu64") Current Index %d| "
- "End Index %d\n",
- dev->device_fh, cur_idx, res_end_idx);
-
- /*
- * Convert from gpa to vva
- * (guest physical addr -> vhost virtual addr)
- */
- vq = dev->virtqueue[VIRTIO_RXQ];
- vb_addr =
- gpa_to_vva(dev, vq->buf_vec[vec_idx].buf_addr);
- vb_hdr_addr = vb_addr;
-
- /* Prefetch buffer address. */
- rte_prefetch0((void *)(uintptr_t)vb_addr);
-
- virtio_hdr.num_buffers = res_end_idx - res_base_idx;
-
- LOG_DEBUG(VHOST_DATA, "(%"PRIu64") RX: Num merge buffers %d\n",
- dev->device_fh, virtio_hdr.num_buffers);
-
- rte_memcpy((void *)(uintptr_t)vb_hdr_addr,
- (const void *)&virtio_hdr, vq->vhost_hlen);
-
- PRINT_PACKET(dev, (uintptr_t)vb_hdr_addr, vq->vhost_hlen, 1);
-
- seg_avail = rte_pktmbuf_data_len(pkt);
- vb_offset = vq->vhost_hlen;
- vb_avail =
- vq->buf_vec[vec_idx].buf_len - vq->vhost_hlen;
-
- entry_len = vq->vhost_hlen;
-
- if (vb_avail == 0) {
- uint32_t desc_idx =
- vq->buf_vec[vec_idx].desc_idx;
- vq->desc[desc_idx].len = vq->vhost_hlen;
-
- if ((vq->desc[desc_idx].flags
- & VRING_DESC_F_NEXT) == 0) {
- /* Update used ring with desc information */
- vq->used->ring[cur_idx & (vq->size - 1)].id
- = vq->buf_vec[vec_idx].desc_idx;
- vq->used->ring[cur_idx & (vq->size - 1)].len
- = entry_len;
-
- entry_len = 0;
- cur_idx++;
- entry_success++;
- }
-
- vec_idx++;
- vb_addr =
- gpa_to_vva(dev, vq->buf_vec[vec_idx].buf_addr);
-
- /* Prefetch buffer address. */
- rte_prefetch0((void *)(uintptr_t)vb_addr);
- vb_offset = 0;
- vb_avail = vq->buf_vec[vec_idx].buf_len;
- }
-
- cpy_len = RTE_MIN(vb_avail, seg_avail);
-
- while (cpy_len > 0) {
- /* Copy mbuf data to vring buffer */
- rte_memcpy((void *)(uintptr_t)(vb_addr + vb_offset),
- (const void *)(rte_pktmbuf_mtod(pkt, char*) + seg_offset),
- cpy_len);
-
- PRINT_PACKET(dev,
- (uintptr_t)(vb_addr + vb_offset),
- cpy_len, 0);
-
- seg_offset += cpy_len;
- vb_offset += cpy_len;
- seg_avail -= cpy_len;
- vb_avail -= cpy_len;
- entry_len += cpy_len;
-
- if (seg_avail != 0) {
- /*
- * The virtio buffer in this vring
- * entry reach to its end.
- * But the segment doesn't complete.
- */
- if ((vq->desc[vq->buf_vec[vec_idx].desc_idx].flags &
- VRING_DESC_F_NEXT) == 0) {
- /* Update used ring with desc information */
- vq->used->ring[cur_idx & (vq->size - 1)].id
- = vq->buf_vec[vec_idx].desc_idx;
- vq->used->ring[cur_idx & (vq->size - 1)].len
- = entry_len;
- entry_len = 0;
- cur_idx++;
- entry_success++;
- }
-
- vec_idx++;
- vb_addr = gpa_to_vva(dev,
- vq->buf_vec[vec_idx].buf_addr);
- vb_offset = 0;
- vb_avail = vq->buf_vec[vec_idx].buf_len;
- cpy_len = RTE_MIN(vb_avail, seg_avail);
- } else {
- /*
- * This current segment complete, need continue to
- * check if the whole packet complete or not.
- */
- pkt = pkt->next;
- if (pkt != NULL) {
- /*
- * There are more segments.
- */
- if (vb_avail == 0) {
- /*
- * This current buffer from vring is
- * used up, need fetch next buffer
- * from buf_vec.
- */
- uint32_t desc_idx =
- vq->buf_vec[vec_idx].desc_idx;
- vq->desc[desc_idx].len = vb_offset;
-
- if ((vq->desc[desc_idx].flags &
- VRING_DESC_F_NEXT) == 0) {
- uint16_t wrapped_idx =
- cur_idx & (vq->size - 1);
- /*
- * Update used ring with the
- * descriptor information
- */
- vq->used->ring[wrapped_idx].id
- = desc_idx;
- vq->used->ring[wrapped_idx].len
- = entry_len;
- entry_success++;
- entry_len = 0;
- cur_idx++;
- }
-
- /* Get next buffer from buf_vec. */
- vec_idx++;
- vb_addr = gpa_to_vva(dev,
- vq->buf_vec[vec_idx].buf_addr);
- vb_avail =
- vq->buf_vec[vec_idx].buf_len;
- vb_offset = 0;
- }
-
- seg_offset = 0;
- seg_avail = rte_pktmbuf_data_len(pkt);
- cpy_len = RTE_MIN(vb_avail, seg_avail);
- } else {
- /*
- * This whole packet completes.
- */
- uint32_t desc_idx =
- vq->buf_vec[vec_idx].desc_idx;
- vq->desc[desc_idx].len = vb_offset;
-
- while (vq->desc[desc_idx].flags &
- VRING_DESC_F_NEXT) {
- desc_idx = vq->desc[desc_idx].next;
- vq->desc[desc_idx].len = 0;
- }
-
- /* Update used ring with desc information */
- vq->used->ring[cur_idx & (vq->size - 1)].id
- = vq->buf_vec[vec_idx].desc_idx;
- vq->used->ring[cur_idx & (vq->size - 1)].len
- = entry_len;
- entry_len = 0;
- cur_idx++;
- entry_success++;
- seg_avail = 0;
- cpy_len = RTE_MIN(vb_avail, seg_avail);
- }
- }
- }
-
- return entry_success;
-}
-
-/*
- * This function adds buffers to the virtio devices RX virtqueue. Buffers can
- * be received from the physical port or from another virtio device. A packet
- * count is returned to indicate the number of packets that were succesfully
- * added to the RX queue. This function works for mergeable RX.
- */
-static inline uint32_t __attribute__((always_inline))
-virtio_dev_merge_rx(struct virtio_net *dev, struct rte_mbuf **pkts,
- uint32_t count)
-{
- struct vhost_virtqueue *vq;
- uint32_t pkt_idx = 0, entry_success = 0;
- uint32_t retry = 0;
- uint16_t avail_idx, res_cur_idx;
- uint16_t res_base_idx, res_end_idx;
- uint8_t success = 0;
-
- LOG_DEBUG(VHOST_DATA, "(%"PRIu64") virtio_dev_merge_rx()\n",
- dev->device_fh);
- vq = dev->virtqueue[VIRTIO_RXQ];
- count = RTE_MIN((uint32_t)MAX_PKT_BURST, count);
-
- if (count == 0)
- return 0;
-
- for (pkt_idx = 0; pkt_idx < count; pkt_idx++) {
- uint32_t secure_len = 0;
- uint16_t need_cnt;
- uint32_t vec_idx = 0;
- uint32_t pkt_len = pkts[pkt_idx]->pkt_len + vq->vhost_hlen;
- uint16_t i, id;
-
- do {
- /*
- * As many data cores may want access to available
- * buffers, they need to be reserved.
- */
- res_base_idx = vq->last_used_idx_res;
- res_cur_idx = res_base_idx;
-
- do {
- avail_idx = *((volatile uint16_t *)&vq->avail->idx);
- if (unlikely(res_cur_idx == avail_idx)) {
- /*
- * If retry is enabled and the queue is
- * full then we wait and retry to avoid
- * packet loss.
- */
- if (enable_retry) {
- uint8_t cont = 0;
- for (retry = 0; retry < burst_rx_retry_num; retry++) {
- rte_delay_us(burst_rx_delay_time);
- avail_idx =
- *((volatile uint16_t *)&vq->avail->idx);
- if (likely(res_cur_idx != avail_idx)) {
- cont = 1;
- break;
- }
- }
- if (cont == 1)
- continue;
- }
-
- LOG_DEBUG(VHOST_DATA,
- "(%"PRIu64") Failed "
- "to get enough desc from "
- "vring\n",
- dev->device_fh);
- return pkt_idx;
- } else {
- uint16_t wrapped_idx =
- (res_cur_idx) & (vq->size - 1);
- uint32_t idx =
- vq->avail->ring[wrapped_idx];
- uint8_t next_desc;
-
- do {
- next_desc = 0;
- secure_len += vq->desc[idx].len;
- if (vq->desc[idx].flags &
- VRING_DESC_F_NEXT) {
- idx = vq->desc[idx].next;
- next_desc = 1;
- }
- } while (next_desc);
-
- res_cur_idx++;
- }
- } while (pkt_len > secure_len);
-
- /* vq->last_used_idx_res is atomically updated. */
- success = rte_atomic16_cmpset(&vq->last_used_idx_res,
- res_base_idx,
- res_cur_idx);
- } while (success == 0);
-
- id = res_base_idx;
- need_cnt = res_cur_idx - res_base_idx;
-
- for (i = 0; i < need_cnt; i++, id++) {
- uint16_t wrapped_idx = id & (vq->size - 1);
- uint32_t idx = vq->avail->ring[wrapped_idx];
- uint8_t next_desc;
- do {
- next_desc = 0;
- vq->buf_vec[vec_idx].buf_addr =
- vq->desc[idx].addr;
- vq->buf_vec[vec_idx].buf_len =
- vq->desc[idx].len;
- vq->buf_vec[vec_idx].desc_idx = idx;
- vec_idx++;
-
- if (vq->desc[idx].flags & VRING_DESC_F_NEXT) {
- idx = vq->desc[idx].next;
- next_desc = 1;
- }
- } while (next_desc);
- }
-
- res_end_idx = res_cur_idx;
-
- entry_success = copy_from_mbuf_to_vring(dev, res_base_idx,
- res_end_idx, pkts[pkt_idx]);
-
- rte_compiler_barrier();
-
- /*
- * Wait until it's our turn to add our buffer
- * to the used ring.
- */
- while (unlikely(vq->last_used_idx != res_base_idx))
- rte_pause();
-
- *(volatile uint16_t *)&vq->used->idx += entry_success;
- vq->last_used_idx = res_end_idx;
-
- /* Kick the guest if necessary. */
- if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT))
- eventfd_write((int)vq->kickfd, 1);
- }
-
- return count;
-}
-
/*
* Compares a packet destination MAC address to a device MAC address.
*/
tx_q->len = len;
return;
}
-
-static inline void __attribute__((always_inline))
-virtio_dev_tx(struct virtio_net* dev, struct rte_mempool *mbuf_pool)
-{
- struct rte_mbuf m;
- struct vhost_virtqueue *vq;
- struct vring_desc *desc;
- uint64_t buff_addr = 0;
- uint32_t head[MAX_PKT_BURST];
- uint32_t used_idx;
- uint32_t i;
- uint16_t free_entries, packet_success = 0;
- uint16_t avail_idx;
-
- vq = dev->virtqueue[VIRTIO_TXQ];
- avail_idx = *((volatile uint16_t *)&vq->avail->idx);
-
- /* If there are no available buffers then return. */
- if (vq->last_used_idx == avail_idx)
- return;
-
- LOG_DEBUG(VHOST_DATA, "(%"PRIu64") virtio_dev_tx()\n", dev->device_fh);
-
- /* Prefetch available ring to retrieve head indexes. */
- rte_prefetch0(&vq->avail->ring[vq->last_used_idx & (vq->size - 1)]);
-
- /*get the number of free entries in the ring*/
- free_entries = (avail_idx - vq->last_used_idx);
-
- /* Limit to MAX_PKT_BURST. */
- if (free_entries > MAX_PKT_BURST)
- free_entries = MAX_PKT_BURST;
-
- LOG_DEBUG(VHOST_DATA, "(%"PRIu64") Buffers available %d\n", dev->device_fh, free_entries);
- /* Retrieve all of the head indexes first to avoid caching issues. */
- for (i = 0; i < free_entries; i++)
- head[i] = vq->avail->ring[(vq->last_used_idx + i) & (vq->size - 1)];
-
- /* Prefetch descriptor index. */
- rte_prefetch0(&vq->desc[head[packet_success]]);
- rte_prefetch0(&vq->used->ring[vq->last_used_idx & (vq->size - 1)]);
-
- while (packet_success < free_entries) {
- desc = &vq->desc[head[packet_success]];
-
- /* Discard first buffer as it is the virtio header */
- desc = &vq->desc[desc->next];
-
- /* Buffer address translation. */
- buff_addr = gpa_to_vva(dev, desc->addr);
- /* Prefetch buffer address. */
- rte_prefetch0((void*)(uintptr_t)buff_addr);
-
- used_idx = vq->last_used_idx & (vq->size - 1);
-
- if (packet_success < (free_entries - 1)) {
- /* Prefetch descriptor index. */
- rte_prefetch0(&vq->desc[head[packet_success+1]]);
- rte_prefetch0(&vq->used->ring[(used_idx + 1) & (vq->size - 1)]);
- }
-
- /* Update used index buffer information. */
- vq->used->ring[used_idx].id = head[packet_success];
- vq->used->ring[used_idx].len = 0;
-
- /* Setup dummy mbuf. This is copied to a real mbuf if transmitted out the physical port. */
- m.data_len = desc->len;
- m.pkt_len = desc->len;
- m.data_off = 0;
-
- PRINT_PACKET(dev, (uintptr_t)buff_addr, desc->len, 0);
-
- /* If this is the first received packet we need to learn the MAC and setup VMDQ */
- if (dev->ready == DEVICE_MAC_LEARNING) {
- if (dev->remove || (link_vmdq(dev, &m) == -1)) {
- /*discard frame if device is scheduled for removal or a duplicate MAC address is found. */
- packet_success += free_entries;
- vq->last_used_idx += packet_success;
- break;
- }
- }
- virtio_tx_route(dev, &m, mbuf_pool, (uint16_t)dev->device_fh);
-
- vq->last_used_idx++;
- packet_success++;
- }
-
- rte_compiler_barrier();
- vq->used->idx += packet_success;
- /* Kick guest if required. */
- if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT))
- eventfd_write((int)vq->kickfd, 1);
-}
-
-/* This function works for TX packets with mergeable feature enabled. */
-static inline void __attribute__((always_inline))
-virtio_dev_merge_tx(struct virtio_net *dev, struct rte_mempool *mbuf_pool)
-{
- struct rte_mbuf *m, *prev;
- struct vhost_virtqueue *vq;
- struct vring_desc *desc;
- uint64_t vb_addr = 0;
- uint32_t head[MAX_PKT_BURST];
- uint32_t used_idx;
- uint32_t i;
- uint16_t free_entries, entry_success = 0;
- uint16_t avail_idx;
- uint32_t buf_size = MBUF_SIZE - (sizeof(struct rte_mbuf)
- + RTE_PKTMBUF_HEADROOM);
-
- vq = dev->virtqueue[VIRTIO_TXQ];
- avail_idx = *((volatile uint16_t *)&vq->avail->idx);
-
- /* If there are no available buffers then return. */
- if (vq->last_used_idx == avail_idx)
- return;
-
- LOG_DEBUG(VHOST_DATA, "(%"PRIu64") virtio_dev_merge_tx()\n",
- dev->device_fh);
-
- /* Prefetch available ring to retrieve head indexes. */
- rte_prefetch0(&vq->avail->ring[vq->last_used_idx & (vq->size - 1)]);
-
- /*get the number of free entries in the ring*/
- free_entries = (avail_idx - vq->last_used_idx);
-
- /* Limit to MAX_PKT_BURST. */
- free_entries = RTE_MIN(free_entries, MAX_PKT_BURST);
-
- LOG_DEBUG(VHOST_DATA, "(%"PRIu64") Buffers available %d\n",
- dev->device_fh, free_entries);
- /* Retrieve all of the head indexes first to avoid caching issues. */
- for (i = 0; i < free_entries; i++)
- head[i] = vq->avail->ring[(vq->last_used_idx + i) & (vq->size - 1)];
-
- /* Prefetch descriptor index. */
- rte_prefetch0(&vq->desc[head[entry_success]]);
- rte_prefetch0(&vq->used->ring[vq->last_used_idx & (vq->size - 1)]);
-
- while (entry_success < free_entries) {
- uint32_t vb_avail, vb_offset;
- uint32_t seg_avail, seg_offset;
- uint32_t cpy_len;
- uint32_t seg_num = 0;
- struct rte_mbuf *cur;
- uint8_t alloc_err = 0;
-
- desc = &vq->desc[head[entry_success]];
-
- /* Discard first buffer as it is the virtio header */
- desc = &vq->desc[desc->next];
-
- /* Buffer address translation. */
- vb_addr = gpa_to_vva(dev, desc->addr);
- /* Prefetch buffer address. */
- rte_prefetch0((void *)(uintptr_t)vb_addr);
-
- used_idx = vq->last_used_idx & (vq->size - 1);
-
- if (entry_success < (free_entries - 1)) {
- /* Prefetch descriptor index. */
- rte_prefetch0(&vq->desc[head[entry_success+1]]);
- rte_prefetch0(&vq->used->ring[(used_idx + 1) & (vq->size - 1)]);
- }
-
- /* Update used index buffer information. */
- vq->used->ring[used_idx].id = head[entry_success];
- vq->used->ring[used_idx].len = 0;
-
- vb_offset = 0;
- vb_avail = desc->len;
- seg_offset = 0;
- seg_avail = buf_size;
- cpy_len = RTE_MIN(vb_avail, seg_avail);
-
- PRINT_PACKET(dev, (uintptr_t)vb_addr, desc->len, 0);
-
- /* Allocate an mbuf and populate the structure. */
- m = rte_pktmbuf_alloc(mbuf_pool);
- if (unlikely(m == NULL)) {
- RTE_LOG(ERR, VHOST_DATA,
- "Failed to allocate memory for mbuf.\n");
- return;
- }
-
- seg_num++;
- cur = m;
- prev = m;
- while (cpy_len != 0) {
- rte_memcpy((void *)(rte_pktmbuf_mtod(cur, char *) + seg_offset),
- (void *)((uintptr_t)(vb_addr + vb_offset)),
- cpy_len);
-
- seg_offset += cpy_len;
- vb_offset += cpy_len;
- vb_avail -= cpy_len;
- seg_avail -= cpy_len;
-
- if (vb_avail != 0) {
- /*
- * The segment reachs to its end,
- * while the virtio buffer in TX vring has
- * more data to be copied.
- */
- cur->data_len = seg_offset;
- m->pkt_len += seg_offset;
- /* Allocate mbuf and populate the structure. */
- cur = rte_pktmbuf_alloc(mbuf_pool);
- if (unlikely(cur == NULL)) {
- RTE_LOG(ERR, VHOST_DATA, "Failed to "
- "allocate memory for mbuf.\n");
- rte_pktmbuf_free(m);
- alloc_err = 1;
- break;
- }
-
- seg_num++;
- prev->next = cur;
- prev = cur;
- seg_offset = 0;
- seg_avail = buf_size;
- } else {
- if (desc->flags & VRING_DESC_F_NEXT) {
- /*
- * There are more virtio buffers in
- * same vring entry need to be copied.
- */
- if (seg_avail == 0) {
- /*
- * The current segment hasn't
- * room to accomodate more
- * data.
- */
- cur->data_len = seg_offset;
- m->pkt_len += seg_offset;
- /*
- * Allocate an mbuf and
- * populate the structure.
- */
- cur = rte_pktmbuf_alloc(mbuf_pool);
- if (unlikely(cur == NULL)) {
- RTE_LOG(ERR,
- VHOST_DATA,
- "Failed to "
- "allocate memory "
- "for mbuf\n");
- rte_pktmbuf_free(m);
- alloc_err = 1;
- break;
- }
- seg_num++;
- prev->next = cur;
- prev = cur;
- seg_offset = 0;
- seg_avail = buf_size;
- }
-
- desc = &vq->desc[desc->next];
-
- /* Buffer address translation. */
- vb_addr = gpa_to_vva(dev, desc->addr);
- /* Prefetch buffer address. */
- rte_prefetch0((void *)(uintptr_t)vb_addr);
- vb_offset = 0;
- vb_avail = desc->len;
-
- PRINT_PACKET(dev, (uintptr_t)vb_addr,
- desc->len, 0);
- } else {
- /* The whole packet completes. */
- cur->data_len = seg_offset;
- m->pkt_len += seg_offset;
- vb_avail = 0;
- }
- }
-
- cpy_len = RTE_MIN(vb_avail, seg_avail);
- }
-
- if (unlikely(alloc_err == 1))
- break;
-
- m->nb_segs = seg_num;
-
- /*
- * If this is the first received packet we need to learn
- * the MAC and setup VMDQ
- */
- if (dev->ready == DEVICE_MAC_LEARNING) {
- if (dev->remove || (link_vmdq(dev, m) == -1)) {
- /*
- * Discard frame if device is scheduled for
- * removal or a duplicate MAC address is found.
- */
- entry_success = free_entries;
- vq->last_used_idx += entry_success;
- rte_pktmbuf_free(m);
- break;
- }
- }
-
- virtio_tx_route(dev, m, mbuf_pool, (uint16_t)dev->device_fh);
- vq->last_used_idx++;
- entry_success++;
- rte_pktmbuf_free(m);
- }
-
- rte_compiler_barrier();
- vq->used->idx += entry_success;
- /* Kick guest if required. */
- if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT))
- eventfd_write((int)vq->kickfd, 1);
-
-}
-
/*
* This function is called by each data core. It handles all RX/TX registered with the
* core. For TX the specific lcore linked list is used. For RX, MAC addresses are compared
git.droids-corp.org / dpdk.git / commitdiff