*/
#include <stdint.h>
+#include <stdbool.h>
#include <linux/virtio_net.h>
#include <rte_mbuf.h>
#include <rte_memcpy.h>
+#include <rte_ether.h>
+#include <rte_ip.h>
#include <rte_virtio_net.h>
+#include <rte_tcp.h>
+#include <rte_udp.h>
+#include <rte_sctp.h>
+#include <rte_arp.h>
#include "vhost-net.h"
#define MAX_PKT_BURST 32
+#define VHOST_LOG_PAGE 4096
-/**
- * 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 are succesfully
- * added to the RX queue. This function works when the mbuf is scattered, but
- * it doesn't support the mergeable feature.
- */
-static inline uint32_t __attribute__((always_inline))
-virtio_dev_rx(struct virtio_net *dev, uint16_t queue_id,
- struct rte_mbuf **pkts, uint32_t count)
+static inline void __attribute__((always_inline))
+vhost_log_page(uint8_t *log_base, uint64_t page)
{
- 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];
- uint32_t head_idx, packet_success = 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_base[page / 8] |= 1 << (page % 8);
+}
- LOG_DEBUG(VHOST_DATA, "(%"PRIu64") virtio_dev_rx()\n", dev->device_fh);
- if (unlikely(queue_id != VIRTIO_RXQ)) {
- LOG_DEBUG(VHOST_DATA, "mq isn't supported in this version.\n");
- return 0;
- }
+static inline void __attribute__((always_inline))
+vhost_log_write(struct virtio_net *dev, uint64_t addr, uint64_t len)
+{
+ uint64_t page;
- vq = dev->virtqueue[VIRTIO_RXQ];
- count = (count > MAX_PKT_BURST) ? MAX_PKT_BURST : count;
+ if (likely(((dev->features & (1ULL << VHOST_F_LOG_ALL)) == 0) ||
+ !dev->log_base || !len))
+ return;
- /*
- * 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);
+ if (unlikely(dev->log_size <= ((addr + len - 1) / VHOST_LOG_PAGE / 8)))
+ return;
- free_entries = (avail_idx - res_base_idx);
- /*check that we have enough buffers*/
- if (unlikely(count > free_entries))
- count = free_entries;
+ /* To make sure guest memory updates are committed before logging */
+ rte_smp_wmb();
- if (count == 0)
- return 0;
+ page = addr / VHOST_LOG_PAGE;
+ while (page * VHOST_LOG_PAGE < addr + len) {
+ vhost_log_page((uint8_t *)(uintptr_t)dev->log_base, page);
+ page += 1;
+ }
+}
- res_end_idx = res_base_idx + count;
- /* vq->last_used_idx_res is atomically updated. */
- /* TODO: Allow to disable cmpset if no concurrency in application. */
- 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);
+static inline void __attribute__((always_inline))
+vhost_log_used_vring(struct virtio_net *dev, struct vhost_virtqueue *vq,
+ uint64_t offset, uint64_t len)
+{
+ vhost_log_write(dev, vq->log_guest_addr + offset, len);
+}
- /* Prefetch available ring to retrieve indexes. */
- rte_prefetch0(&vq->avail->ring[res_cur_idx & (vq->size - 1)]);
+static bool
+is_valid_virt_queue_idx(uint32_t idx, int is_tx, uint32_t qp_nb)
+{
+ return (is_tx ^ (idx & 1)) == 0 && idx < qp_nb * VIRTIO_QNUM;
+}
- /* 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)];
+static void
+virtio_enqueue_offload(struct rte_mbuf *m_buf, struct virtio_net_hdr *net_hdr)
+{
+ if (m_buf->ol_flags & PKT_TX_L4_MASK) {
+ net_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
+ net_hdr->csum_start = m_buf->l2_len + m_buf->l3_len;
+
+ switch (m_buf->ol_flags & PKT_TX_L4_MASK) {
+ case PKT_TX_TCP_CKSUM:
+ net_hdr->csum_offset = (offsetof(struct tcp_hdr,
+ cksum));
+ break;
+ case PKT_TX_UDP_CKSUM:
+ net_hdr->csum_offset = (offsetof(struct udp_hdr,
+ dgram_cksum));
+ break;
+ case PKT_TX_SCTP_CKSUM:
+ net_hdr->csum_offset = (offsetof(struct sctp_hdr,
+ cksum));
+ break;
+ }
+ }
- /*Prefetch descriptor index. */
- rte_prefetch0(&vq->desc[head[packet_success]]);
+ if (m_buf->ol_flags & PKT_TX_TCP_SEG) {
+ if (m_buf->ol_flags & PKT_TX_IPV4)
+ net_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
+ else
+ net_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
+ net_hdr->gso_size = m_buf->tso_segsz;
+ net_hdr->hdr_len = m_buf->l2_len + m_buf->l3_len
+ + m_buf->l4_len;
+ }
+}
- while (res_cur_idx != res_end_idx) {
- uint32_t offset = 0, vb_offset = 0;
- uint32_t pkt_len, len_to_cpy, data_len, total_copied = 0;
- uint8_t hdr = 0, uncompleted_pkt = 0;
+static inline void
+copy_virtio_net_hdr(struct virtio_net *dev, uint64_t desc_addr,
+ struct virtio_net_hdr_mrg_rxbuf hdr)
+{
+ if (dev->vhost_hlen == sizeof(struct virtio_net_hdr_mrg_rxbuf))
+ *(struct virtio_net_hdr_mrg_rxbuf *)(uintptr_t)desc_addr = hdr;
+ else
+ *(struct virtio_net_hdr *)(uintptr_t)desc_addr = hdr.hdr;
+}
- /* Get descriptor from available ring */
- desc = &vq->desc[head[packet_success]];
+static inline int __attribute__((always_inline))
+copy_mbuf_to_desc(struct virtio_net *dev, struct vhost_virtqueue *vq,
+ struct rte_mbuf *m, uint16_t desc_idx)
+{
+ uint32_t desc_avail, desc_offset;
+ uint32_t mbuf_avail, mbuf_offset;
+ uint32_t cpy_len;
+ struct vring_desc *desc;
+ uint64_t desc_addr;
+ struct virtio_net_hdr_mrg_rxbuf virtio_hdr = {{0, 0, 0, 0, 0, 0}, 0};
- buff = pkts[packet_success];
+ desc = &vq->desc[desc_idx];
+ desc_addr = gpa_to_vva(dev, desc->addr);
+ /*
+ * Checking of 'desc_addr' placed outside of 'unlikely' macro to avoid
+ * performance issue with some versions of gcc (4.8.4 and 5.3.0) which
+ * otherwise stores offset on the stack instead of in a register.
+ */
+ if (unlikely(desc->len < dev->vhost_hlen) || !desc_addr)
+ return -1;
- /* 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);
+ rte_prefetch0((void *)(uintptr_t)desc_addr);
- /* Copy virtio_hdr to packet and increment buffer address */
- buff_hdr_addr = buff_addr;
+ virtio_enqueue_offload(m, &virtio_hdr.hdr);
+ copy_virtio_net_hdr(dev, desc_addr, virtio_hdr);
+ vhost_log_write(dev, desc->addr, dev->vhost_hlen);
+ PRINT_PACKET(dev, (uintptr_t)desc_addr, dev->vhost_hlen, 0);
- /*
- * 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);
- } else {
- vb_offset += vq->vhost_hlen;
- hdr = 1;
- }
+ desc_offset = dev->vhost_hlen;
+ desc_avail = desc->len - dev->vhost_hlen;
- pkt_len = rte_pktmbuf_pkt_len(buff);
- data_len = rte_pktmbuf_data_len(buff);
- len_to_cpy = RTE_MIN(data_len,
- hdr ? desc->len - vq->vhost_hlen : desc->len);
- while (total_copied < pkt_len) {
- /* Copy mbuf data to buffer */
- rte_memcpy((void *)(uintptr_t)(buff_addr + vb_offset),
- rte_pktmbuf_mtod_offset(buff, const void *, offset),
- len_to_cpy);
- PRINT_PACKET(dev, (uintptr_t)(buff_addr + vb_offset),
- len_to_cpy, 0);
-
- offset += len_to_cpy;
- vb_offset += len_to_cpy;
- total_copied += len_to_cpy;
-
- /* The whole packet completes */
- if (total_copied == pkt_len)
- break;
+ mbuf_avail = rte_pktmbuf_data_len(m);
+ mbuf_offset = 0;
+ while (mbuf_avail != 0 || m->next != NULL) {
+ /* done with current mbuf, fetch next */
+ if (mbuf_avail == 0) {
+ m = m->next;
- /* The current segment completes */
- if (offset == data_len) {
- buff = buff->next;
- offset = 0;
- data_len = rte_pktmbuf_data_len(buff);
- }
+ mbuf_offset = 0;
+ mbuf_avail = rte_pktmbuf_data_len(m);
+ }
- /* The current vring descriptor done */
- if (vb_offset == desc->len) {
- if (desc->flags & VRING_DESC_F_NEXT) {
- desc = &vq->desc[desc->next];
- buff_addr = gpa_to_vva(dev, desc->addr);
- vb_offset = 0;
- } else {
- /* Room in vring buffer is not enough */
- uncompleted_pkt = 1;
- break;
- }
+ /* done with current desc buf, fetch next */
+ if (desc_avail == 0) {
+ if ((desc->flags & VRING_DESC_F_NEXT) == 0) {
+ /* Room in vring buffer is not enough */
+ return -1;
}
- len_to_cpy = RTE_MIN(data_len - offset, desc->len - vb_offset);
- };
+ if (unlikely(desc->next >= vq->size))
+ return -1;
- /* Update used ring with desc information */
- vq->used->ring[res_cur_idx & (vq->size - 1)].id =
- head[packet_success];
+ desc = &vq->desc[desc->next];
+ desc_addr = gpa_to_vva(dev, desc->addr);
+ if (unlikely(!desc_addr))
+ return -1;
- /* Drop the packet if it is uncompleted */
- if (unlikely(uncompleted_pkt == 1))
- vq->used->ring[res_cur_idx & (vq->size - 1)].len =
- vq->vhost_hlen;
- else
- vq->used->ring[res_cur_idx & (vq->size - 1)].len =
- pkt_len + vq->vhost_hlen;
+ desc_offset = 0;
+ desc_avail = desc->len;
+ }
+
+ cpy_len = RTE_MIN(desc_avail, mbuf_avail);
+ rte_memcpy((void *)((uintptr_t)(desc_addr + desc_offset)),
+ rte_pktmbuf_mtod_offset(m, void *, mbuf_offset),
+ cpy_len);
+ vhost_log_write(dev, desc->addr + desc_offset, cpy_len);
+ PRINT_PACKET(dev, (uintptr_t)(desc_addr + desc_offset),
+ cpy_len, 0);
+
+ mbuf_avail -= cpy_len;
+ mbuf_offset += cpy_len;
+ desc_avail -= cpy_len;
+ desc_offset += cpy_len;
+ }
+
+ return 0;
+}
+
+/**
+ * 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 are succesfully
+ * added to the RX queue. This function works when the mbuf is scattered, but
+ * it doesn't support the mergeable feature.
+ */
+static inline uint32_t __attribute__((always_inline))
+virtio_dev_rx(struct virtio_net *dev, uint16_t queue_id,
+ struct rte_mbuf **pkts, uint32_t count)
+{
+ struct vhost_virtqueue *vq;
+ uint16_t avail_idx, free_entries, start_idx;
+ uint16_t desc_indexes[MAX_PKT_BURST];
+ uint16_t used_idx;
+ uint32_t i;
- res_cur_idx++;
- packet_success++;
+ LOG_DEBUG(VHOST_DATA, "(%d) %s\n", dev->vid, __func__);
+ if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->virt_qp_nb))) {
+ RTE_LOG(ERR, VHOST_DATA, "(%d) %s: invalid virtqueue idx %d.\n",
+ dev->vid, __func__, queue_id);
+ return 0;
+ }
- if (unlikely(uncompleted_pkt == 1))
- continue;
+ vq = dev->virtqueue[queue_id];
+ if (unlikely(vq->enabled == 0))
+ return 0;
- rte_memcpy((void *)(uintptr_t)buff_hdr_addr,
- (const void *)&virtio_hdr, vq->vhost_hlen);
+ avail_idx = *((volatile uint16_t *)&vq->avail->idx);
+ start_idx = vq->last_used_idx;
+ free_entries = avail_idx - start_idx;
+ count = RTE_MIN(count, free_entries);
+ count = RTE_MIN(count, (uint32_t)MAX_PKT_BURST);
+ if (count == 0)
+ return 0;
- PRINT_PACKET(dev, (uintptr_t)buff_hdr_addr, vq->vhost_hlen, 1);
+ LOG_DEBUG(VHOST_DATA, "(%d) start_idx %d | end_idx %d\n",
+ dev->vid, start_idx, start_idx + count);
+
+ /* Retrieve all of the desc indexes first to avoid caching issues. */
+ rte_prefetch0(&vq->avail->ring[start_idx & (vq->size - 1)]);
+ for (i = 0; i < count; i++) {
+ used_idx = (start_idx + i) & (vq->size - 1);
+ desc_indexes[i] = vq->avail->ring[used_idx];
+ vq->used->ring[used_idx].id = desc_indexes[i];
+ vq->used->ring[used_idx].len = pkts[i]->pkt_len +
+ dev->vhost_hlen;
+ vhost_log_used_vring(dev, vq,
+ offsetof(struct vring_used, ring[used_idx]),
+ sizeof(vq->used->ring[used_idx]));
+ }
- if (res_cur_idx < res_end_idx) {
- /* Prefetch descriptor index. */
- rte_prefetch0(&vq->desc[head[packet_success]]);
+ rte_prefetch0(&vq->desc[desc_indexes[0]]);
+ for (i = 0; i < count; i++) {
+ uint16_t desc_idx = desc_indexes[i];
+ int err;
+
+ err = copy_mbuf_to_desc(dev, vq, pkts[i], desc_idx);
+ if (unlikely(err)) {
+ used_idx = (start_idx + i) & (vq->size - 1);
+ vq->used->ring[used_idx].len = dev->vhost_hlen;
+ vhost_log_used_vring(dev, vq,
+ offsetof(struct vring_used, ring[used_idx]),
+ sizeof(vq->used->ring[used_idx]));
}
- }
- rte_compiler_barrier();
+ if (i + 1 < count)
+ rte_prefetch0(&vq->desc[desc_indexes[i+1]]);
+ }
- /* 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();
+ rte_smp_wmb();
*(volatile uint16_t *)&vq->used->idx += count;
- vq->last_used_idx = res_end_idx;
+ vq->last_used_idx += count;
+ vhost_log_used_vring(dev, vq,
+ offsetof(struct vring_used, idx),
+ sizeof(vq->used->idx));
/* flush used->idx update before we read avail->flags. */
rte_mb();
/* Kick the guest if necessary. */
- if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT))
- eventfd_write((int)vq->callfd, 1);
+ if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT)
+ && (vq->callfd >= 0))
+ eventfd_write(vq->callfd, (eventfd_t)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)
+static inline int
+fill_vec_buf(struct vhost_virtqueue *vq, uint32_t avail_idx,
+ uint32_t *allocated, uint32_t *vec_idx,
+ struct buf_vector *buf_vec)
{
- 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);
+ uint16_t idx = vq->avail->ring[avail_idx & (vq->size - 1)];
+ uint32_t vec_id = *vec_idx;
+ uint32_t len = *allocated;
- /*
- * 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;
+ while (1) {
+ if (unlikely(vec_id >= BUF_VECTOR_MAX || idx >= vq->size))
+ return -1;
- /* Prefetch buffer address. */
- rte_prefetch0((void *)(uintptr_t)vb_addr);
+ len += vq->desc[idx].len;
+ buf_vec[vec_id].buf_addr = vq->desc[idx].addr;
+ buf_vec[vec_id].buf_len = vq->desc[idx].len;
+ buf_vec[vec_id].desc_idx = idx;
+ vec_id++;
- virtio_hdr.num_buffers = res_end_idx - res_base_idx;
+ if ((vq->desc[idx].flags & VRING_DESC_F_NEXT) == 0)
+ break;
- LOG_DEBUG(VHOST_DATA, "(%"PRIu64") RX: Num merge buffers %d\n",
- dev->device_fh, virtio_hdr.num_buffers);
+ idx = vq->desc[idx].next;
+ }
- rte_memcpy((void *)(uintptr_t)vb_hdr_addr,
- (const void *)&virtio_hdr, vq->vhost_hlen);
+ *allocated = len;
+ *vec_idx = vec_id;
- PRINT_PACKET(dev, (uintptr_t)vb_hdr_addr, vq->vhost_hlen, 1);
+ return 0;
+}
- seg_avail = rte_pktmbuf_data_len(pkt);
- vb_offset = vq->vhost_hlen;
- vb_avail = vq->buf_vec[vec_idx].buf_len - vq->vhost_hlen;
+/*
+ * Returns -1 on fail, 0 on success
+ */
+static inline int
+reserve_avail_buf_mergeable(struct vhost_virtqueue *vq, uint32_t size,
+ uint16_t *end, struct buf_vector *buf_vec)
+{
+ uint16_t cur_idx;
+ uint16_t avail_idx;
+ uint32_t allocated = 0;
+ uint32_t vec_idx = 0;
+ uint16_t tries = 0;
- entry_len = vq->vhost_hlen;
+ cur_idx = vq->last_used_idx;
- if (vb_avail == 0) {
- uint32_t desc_idx =
- vq->buf_vec[vec_idx].desc_idx;
+ while (1) {
+ avail_idx = *((volatile uint16_t *)&vq->avail->idx);
+ if (unlikely(cur_idx == avail_idx))
+ return -1;
- 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;
+ if (unlikely(fill_vec_buf(vq, cur_idx, &allocated,
+ &vec_idx, buf_vec) < 0))
+ return -1;
- entry_len = 0;
- cur_idx++;
- entry_success++;
- }
+ cur_idx++;
+ tries++;
- vec_idx++;
- vb_addr = gpa_to_vva(dev, vq->buf_vec[vec_idx].buf_addr);
+ if (allocated >= size)
+ break;
- /* Prefetch buffer address. */
- rte_prefetch0((void *)(uintptr_t)vb_addr);
- vb_offset = 0;
- vb_avail = vq->buf_vec[vec_idx].buf_len;
+ /*
+ * if we tried all available ring items, and still
+ * can't get enough buf, it means something abnormal
+ * happened.
+ */
+ if (unlikely(tries >= vq->size))
+ return -1;
}
- cpy_len = RTE_MIN(vb_avail, seg_avail);
+ *end = cur_idx;
+ return 0;
+}
- while (cpy_len > 0) {
- /* Copy mbuf data to vring buffer */
- rte_memcpy((void *)(uintptr_t)(vb_addr + vb_offset),
- rte_pktmbuf_mtod_offset(pkt, const void *, seg_offset),
- cpy_len);
+static inline uint32_t __attribute__((always_inline))
+copy_mbuf_to_desc_mergeable(struct virtio_net *dev, struct vhost_virtqueue *vq,
+ uint16_t end_idx, struct rte_mbuf *m,
+ struct buf_vector *buf_vec)
+{
+ struct virtio_net_hdr_mrg_rxbuf virtio_hdr = {{0, 0, 0, 0, 0, 0}, 0};
+ uint32_t vec_idx = 0;
+ uint16_t start_idx = vq->last_used_idx;
+ uint16_t cur_idx = start_idx;
+ uint64_t desc_addr;
+ uint32_t mbuf_offset, mbuf_avail;
+ uint32_t desc_offset, desc_avail;
+ uint32_t cpy_len;
+ uint16_t desc_idx, used_idx;
+
+ if (unlikely(m == NULL))
+ return 0;
- PRINT_PACKET(dev,
- (uintptr_t)(vb_addr + vb_offset),
- cpy_len, 0);
+ LOG_DEBUG(VHOST_DATA, "(%d) current index %d | end index %d\n",
+ dev->vid, cur_idx, end_idx);
+
+ desc_addr = gpa_to_vva(dev, buf_vec[vec_idx].buf_addr);
+ if (buf_vec[vec_idx].buf_len < dev->vhost_hlen || !desc_addr)
+ return 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) {
+ rte_prefetch0((void *)(uintptr_t)desc_addr);
+
+ virtio_hdr.num_buffers = end_idx - start_idx;
+ LOG_DEBUG(VHOST_DATA, "(%d) RX: num merge buffers %d\n",
+ dev->vid, virtio_hdr.num_buffers);
+
+ virtio_enqueue_offload(m, &virtio_hdr.hdr);
+ copy_virtio_net_hdr(dev, desc_addr, virtio_hdr);
+ vhost_log_write(dev, buf_vec[vec_idx].buf_addr, dev->vhost_hlen);
+ PRINT_PACKET(dev, (uintptr_t)desc_addr, dev->vhost_hlen, 0);
+
+ desc_avail = buf_vec[vec_idx].buf_len - dev->vhost_hlen;
+ desc_offset = dev->vhost_hlen;
+
+ mbuf_avail = rte_pktmbuf_data_len(m);
+ mbuf_offset = 0;
+ while (mbuf_avail != 0 || m->next != NULL) {
+ /* done with current desc buf, get the next one */
+ if (desc_avail == 0) {
+ desc_idx = buf_vec[vec_idx].desc_idx;
+
+ if (!(vq->desc[desc_idx].flags & VRING_DESC_F_NEXT)) {
/* 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++;
+ used_idx = cur_idx++ & (vq->size - 1);
+ vq->used->ring[used_idx].id = desc_idx;
+ vq->used->ring[used_idx].len = desc_offset;
+ vhost_log_used_vring(dev, vq,
+ offsetof(struct vring_used,
+ ring[used_idx]),
+ sizeof(vq->used->ring[used_idx]));
}
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;
-
- 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.
- */
- /* 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_success++;
- break;
- }
+ desc_addr = gpa_to_vva(dev, buf_vec[vec_idx].buf_addr);
+ if (unlikely(!desc_addr))
+ return 0;
+
+ /* Prefetch buffer address. */
+ rte_prefetch0((void *)(uintptr_t)desc_addr);
+ desc_offset = 0;
+ desc_avail = buf_vec[vec_idx].buf_len;
}
- }
- return entry_success;
-}
+ /* done with current mbuf, get the next one */
+ if (mbuf_avail == 0) {
+ m = m->next;
-static inline void __attribute__((always_inline))
-update_secure_len(struct vhost_virtqueue *vq, uint32_t id,
- uint32_t *secure_len, uint32_t *vec_idx)
-{
- uint16_t wrapped_idx = id & (vq->size - 1);
- uint32_t idx = vq->avail->ring[wrapped_idx];
- uint8_t next_desc;
- uint32_t len = *secure_len;
- uint32_t vec_id = *vec_idx;
+ mbuf_offset = 0;
+ mbuf_avail = rte_pktmbuf_data_len(m);
+ }
- do {
- next_desc = 0;
- len += vq->desc[idx].len;
- vq->buf_vec[vec_id].buf_addr = vq->desc[idx].addr;
- vq->buf_vec[vec_id].buf_len = vq->desc[idx].len;
- vq->buf_vec[vec_id].desc_idx = idx;
- vec_id++;
+ cpy_len = RTE_MIN(desc_avail, mbuf_avail);
+ rte_memcpy((void *)((uintptr_t)(desc_addr + desc_offset)),
+ rte_pktmbuf_mtod_offset(m, void *, mbuf_offset),
+ cpy_len);
+ vhost_log_write(dev, buf_vec[vec_idx].buf_addr + desc_offset,
+ cpy_len);
+ PRINT_PACKET(dev, (uintptr_t)(desc_addr + desc_offset),
+ cpy_len, 0);
- if (vq->desc[idx].flags & VRING_DESC_F_NEXT) {
- idx = vq->desc[idx].next;
- next_desc = 1;
- }
- } while (next_desc);
+ mbuf_avail -= cpy_len;
+ mbuf_offset += cpy_len;
+ desc_avail -= cpy_len;
+ desc_offset += cpy_len;
+ }
- *secure_len = len;
- *vec_idx = vec_id;
+ used_idx = cur_idx & (vq->size - 1);
+ vq->used->ring[used_idx].id = buf_vec[vec_idx].desc_idx;
+ vq->used->ring[used_idx].len = desc_offset;
+ vhost_log_used_vring(dev, vq,
+ offsetof(struct vring_used, ring[used_idx]),
+ sizeof(vq->used->ring[used_idx]));
+
+ return end_idx - start_idx;
}
-/*
- * This function works for mergeable RX.
- */
static inline uint32_t __attribute__((always_inline))
virtio_dev_merge_rx(struct virtio_net *dev, uint16_t queue_id,
struct rte_mbuf **pkts, uint32_t count)
{
struct vhost_virtqueue *vq;
- uint32_t pkt_idx = 0, entry_success = 0;
- uint16_t avail_idx;
- uint16_t res_base_idx, res_cur_idx;
- uint8_t success = 0;
-
- LOG_DEBUG(VHOST_DATA, "(%"PRIu64") virtio_dev_merge_rx()\n",
- dev->device_fh);
- if (unlikely(queue_id != VIRTIO_RXQ)) {
- LOG_DEBUG(VHOST_DATA, "mq isn't supported in this version.\n");
+ uint32_t pkt_idx = 0, nr_used = 0;
+ uint16_t end;
+ struct buf_vector buf_vec[BUF_VECTOR_MAX];
+
+ LOG_DEBUG(VHOST_DATA, "(%d) %s\n", dev->vid, __func__);
+ if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->virt_qp_nb))) {
+ RTE_LOG(ERR, VHOST_DATA, "(%d) %s: invalid virtqueue idx %d.\n",
+ dev->vid, __func__, queue_id);
+ return 0;
}
- vq = dev->virtqueue[VIRTIO_RXQ];
- count = RTE_MIN((uint32_t)MAX_PKT_BURST, count);
+ vq = dev->virtqueue[queue_id];
+ if (unlikely(vq->enabled == 0))
+ return 0;
+ 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 pkt_len = pkts[pkt_idx]->pkt_len + vq->vhost_hlen;
-
- do {
- /*
- * As many data cores may want access to available
- * buffers, they need to be reserved.
- */
- uint32_t secure_len = 0;
- uint32_t vec_idx = 0;
-
- 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)) {
- LOG_DEBUG(VHOST_DATA,
- "(%"PRIu64") Failed "
- "to get enough desc from "
- "vring\n",
- dev->device_fh);
- return pkt_idx;
- } else {
- update_secure_len(vq, res_cur_idx, &secure_len, &vec_idx);
- 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);
-
- entry_success = copy_from_mbuf_to_vring(dev, res_base_idx,
- res_cur_idx, pkts[pkt_idx]);
-
- rte_compiler_barrier();
+ uint32_t pkt_len = pkts[pkt_idx]->pkt_len + dev->vhost_hlen;
- /*
- * 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();
+ if (unlikely(reserve_avail_buf_mergeable(vq, pkt_len,
+ &end, buf_vec) < 0)) {
+ LOG_DEBUG(VHOST_DATA,
+ "(%d) failed to get enough desc from vring\n",
+ dev->vid);
+ break;
+ }
+
+ nr_used = copy_mbuf_to_desc_mergeable(dev, vq, end,
+ pkts[pkt_idx], buf_vec);
+ rte_smp_wmb();
- *(volatile uint16_t *)&vq->used->idx += entry_success;
- vq->last_used_idx = res_cur_idx;
+ *(volatile uint16_t *)&vq->used->idx += nr_used;
+ vhost_log_used_vring(dev, vq, offsetof(struct vring_used, idx),
+ sizeof(vq->used->idx));
+ vq->last_used_idx += nr_used;
+ }
+ if (likely(pkt_idx)) {
/* flush used->idx update before we read avail->flags. */
rte_mb();
/* Kick the guest if necessary. */
- if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT))
- eventfd_write((int)vq->callfd, 1);
+ if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT)
+ && (vq->callfd >= 0))
+ eventfd_write(vq->callfd, (eventfd_t)1);
}
- return count;
+ return pkt_idx;
}
uint16_t
-rte_vhost_enqueue_burst(struct virtio_net *dev, uint16_t queue_id,
+rte_vhost_enqueue_burst(int vid, uint16_t queue_id,
struct rte_mbuf **pkts, uint16_t count)
{
- if (unlikely(dev->features & (1 << VIRTIO_NET_F_MRG_RXBUF)))
+ struct virtio_net *dev = get_device(vid);
+
+ if (!dev)
+ return 0;
+
+ if (dev->features & (1 << VIRTIO_NET_F_MRG_RXBUF))
return virtio_dev_merge_rx(dev, queue_id, pkts, count);
else
return virtio_dev_rx(dev, queue_id, pkts, count);
}
-uint16_t
-rte_vhost_dequeue_burst(struct virtio_net *dev, uint16_t queue_id,
- struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count)
+static void
+parse_ethernet(struct rte_mbuf *m, uint16_t *l4_proto, void **l4_hdr)
{
- 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;
+ struct ipv4_hdr *ipv4_hdr;
+ struct ipv6_hdr *ipv6_hdr;
+ void *l3_hdr = NULL;
+ struct ether_hdr *eth_hdr;
+ uint16_t ethertype;
- if (unlikely(queue_id != VIRTIO_TXQ)) {
- LOG_DEBUG(VHOST_DATA, "mq isn't supported in this version.\n");
- return 0;
+ eth_hdr = rte_pktmbuf_mtod(m, struct ether_hdr *);
+
+ m->l2_len = sizeof(struct ether_hdr);
+ ethertype = rte_be_to_cpu_16(eth_hdr->ether_type);
+
+ if (ethertype == ETHER_TYPE_VLAN) {
+ struct vlan_hdr *vlan_hdr = (struct vlan_hdr *)(eth_hdr + 1);
+
+ m->l2_len += sizeof(struct vlan_hdr);
+ ethertype = rte_be_to_cpu_16(vlan_hdr->eth_proto);
}
- vq = dev->virtqueue[VIRTIO_TXQ];
- avail_idx = *((volatile uint16_t *)&vq->avail->idx);
+ l3_hdr = (char *)eth_hdr + m->l2_len;
+
+ switch (ethertype) {
+ case ETHER_TYPE_IPv4:
+ ipv4_hdr = (struct ipv4_hdr *)l3_hdr;
+ *l4_proto = ipv4_hdr->next_proto_id;
+ m->l3_len = (ipv4_hdr->version_ihl & 0x0f) * 4;
+ *l4_hdr = (char *)l3_hdr + m->l3_len;
+ m->ol_flags |= PKT_TX_IPV4;
+ break;
+ case ETHER_TYPE_IPv6:
+ ipv6_hdr = (struct ipv6_hdr *)l3_hdr;
+ *l4_proto = ipv6_hdr->proto;
+ m->l3_len = sizeof(struct ipv6_hdr);
+ *l4_hdr = (char *)l3_hdr + m->l3_len;
+ m->ol_flags |= PKT_TX_IPV6;
+ break;
+ default:
+ m->l3_len = 0;
+ *l4_proto = 0;
+ break;
+ }
+}
- /* If there are no available buffers then return. */
- if (vq->last_used_idx == avail_idx)
- return 0;
+static inline void __attribute__((always_inline))
+vhost_dequeue_offload(struct virtio_net_hdr *hdr, struct rte_mbuf *m)
+{
+ uint16_t l4_proto = 0;
+ void *l4_hdr = NULL;
+ struct tcp_hdr *tcp_hdr = NULL;
+
+ parse_ethernet(m, &l4_proto, &l4_hdr);
+ if (hdr->flags == VIRTIO_NET_HDR_F_NEEDS_CSUM) {
+ if (hdr->csum_start == (m->l2_len + m->l3_len)) {
+ switch (hdr->csum_offset) {
+ case (offsetof(struct tcp_hdr, cksum)):
+ if (l4_proto == IPPROTO_TCP)
+ m->ol_flags |= PKT_TX_TCP_CKSUM;
+ break;
+ case (offsetof(struct udp_hdr, dgram_cksum)):
+ if (l4_proto == IPPROTO_UDP)
+ m->ol_flags |= PKT_TX_UDP_CKSUM;
+ break;
+ case (offsetof(struct sctp_hdr, cksum)):
+ if (l4_proto == IPPROTO_SCTP)
+ m->ol_flags |= PKT_TX_SCTP_CKSUM;
+ break;
+ default:
+ break;
+ }
+ }
+ }
+
+ if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
+ switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
+ case VIRTIO_NET_HDR_GSO_TCPV4:
+ case VIRTIO_NET_HDR_GSO_TCPV6:
+ tcp_hdr = (struct tcp_hdr *)l4_hdr;
+ m->ol_flags |= PKT_TX_TCP_SEG;
+ m->tso_segsz = hdr->gso_size;
+ m->l4_len = (tcp_hdr->data_off & 0xf0) >> 2;
+ break;
+ default:
+ RTE_LOG(WARNING, VHOST_DATA,
+ "unsupported gso type %u.\n", hdr->gso_type);
+ break;
+ }
+ }
+}
- LOG_DEBUG(VHOST_DATA, "%s (%"PRIu64")\n", __func__,
- dev->device_fh);
+#define RARP_PKT_SIZE 64
- /* Prefetch available ring to retrieve head indexes. */
- rte_prefetch0(&vq->avail->ring[vq->last_used_idx & (vq->size - 1)]);
+static int
+make_rarp_packet(struct rte_mbuf *rarp_mbuf, const struct ether_addr *mac)
+{
+ struct ether_hdr *eth_hdr;
+ struct arp_hdr *rarp;
+
+ if (rarp_mbuf->buf_len < 64) {
+ RTE_LOG(WARNING, VHOST_DATA,
+ "failed to make RARP; mbuf size too small %u (< %d)\n",
+ rarp_mbuf->buf_len, RARP_PKT_SIZE);
+ return -1;
+ }
- /*get the number of free entries in the ring*/
- free_entries = (avail_idx - vq->last_used_idx);
+ /* Ethernet header. */
+ eth_hdr = rte_pktmbuf_mtod_offset(rarp_mbuf, struct ether_hdr *, 0);
+ memset(eth_hdr->d_addr.addr_bytes, 0xff, ETHER_ADDR_LEN);
+ ether_addr_copy(mac, ð_hdr->s_addr);
+ eth_hdr->ether_type = htons(ETHER_TYPE_RARP);
- free_entries = RTE_MIN(free_entries, count);
- /* Limit to MAX_PKT_BURST. */
- free_entries = RTE_MIN(free_entries, MAX_PKT_BURST);
+ /* RARP header. */
+ rarp = (struct arp_hdr *)(eth_hdr + 1);
+ rarp->arp_hrd = htons(ARP_HRD_ETHER);
+ rarp->arp_pro = htons(ETHER_TYPE_IPv4);
+ rarp->arp_hln = ETHER_ADDR_LEN;
+ rarp->arp_pln = 4;
+ rarp->arp_op = htons(ARP_OP_REVREQUEST);
- 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)];
+ ether_addr_copy(mac, &rarp->arp_data.arp_sha);
+ ether_addr_copy(mac, &rarp->arp_data.arp_tha);
+ memset(&rarp->arp_data.arp_sip, 0x00, 4);
+ memset(&rarp->arp_data.arp_tip, 0x00, 4);
- /* Prefetch descriptor index. */
- rte_prefetch0(&vq->desc[head[entry_success]]);
- rte_prefetch0(&vq->used->ring[vq->last_used_idx & (vq->size - 1)]);
+ rarp_mbuf->pkt_len = rarp_mbuf->data_len = RARP_PKT_SIZE;
+
+ return 0;
+}
+
+static inline int __attribute__((always_inline))
+copy_desc_to_mbuf(struct virtio_net *dev, struct vhost_virtqueue *vq,
+ struct rte_mbuf *m, uint16_t desc_idx,
+ struct rte_mempool *mbuf_pool)
+{
+ struct vring_desc *desc;
+ uint64_t desc_addr;
+ uint32_t desc_avail, desc_offset;
+ uint32_t mbuf_avail, mbuf_offset;
+ uint32_t cpy_len;
+ struct rte_mbuf *cur = m, *prev = m;
+ struct virtio_net_hdr *hdr;
+ /* A counter to avoid desc dead loop chain */
+ uint32_t nr_desc = 1;
+
+ desc = &vq->desc[desc_idx];
+ if (unlikely(desc->len < dev->vhost_hlen))
+ return -1;
+
+ desc_addr = gpa_to_vva(dev, desc->addr);
+ if (unlikely(!desc_addr))
+ return -1;
+
+ hdr = (struct virtio_net_hdr *)((uintptr_t)desc_addr);
+ rte_prefetch0(hdr);
+
+ /*
+ * A virtio driver normally uses at least 2 desc buffers
+ * for Tx: the first for storing the header, and others
+ * for storing the data.
+ */
+ if (likely((desc->len == dev->vhost_hlen) &&
+ (desc->flags & VRING_DESC_F_NEXT) != 0)) {
+ desc = &vq->desc[desc->next];
+
+ desc_addr = gpa_to_vva(dev, desc->addr);
+ if (unlikely(!desc_addr))
+ return -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;
+ rte_prefetch0((void *)(uintptr_t)desc_addr);
- desc = &vq->desc[head[entry_success]];
+ desc_offset = 0;
+ desc_avail = desc->len;
+ nr_desc += 1;
- /* Discard first buffer as it is the virtio header */
- if (desc->flags & VRING_DESC_F_NEXT) {
+ PRINT_PACKET(dev, (uintptr_t)desc_addr, desc->len, 0);
+ } else {
+ desc_avail = desc->len - dev->vhost_hlen;
+ desc_offset = dev->vhost_hlen;
+ }
+
+ mbuf_offset = 0;
+ mbuf_avail = m->buf_len - RTE_PKTMBUF_HEADROOM;
+ while (1) {
+ cpy_len = RTE_MIN(desc_avail, mbuf_avail);
+ rte_memcpy(rte_pktmbuf_mtod_offset(cur, void *, mbuf_offset),
+ (void *)((uintptr_t)(desc_addr + desc_offset)),
+ cpy_len);
+
+ mbuf_avail -= cpy_len;
+ mbuf_offset += cpy_len;
+ desc_avail -= cpy_len;
+ desc_offset += cpy_len;
+
+ /* This desc reaches to its end, get the next one */
+ if (desc_avail == 0) {
+ if ((desc->flags & VRING_DESC_F_NEXT) == 0)
+ break;
+
+ if (unlikely(desc->next >= vq->size ||
+ ++nr_desc > vq->size))
+ return -1;
desc = &vq->desc[desc->next];
- vb_offset = 0;
- vb_avail = desc->len;
- } else {
- vb_offset = vq->vhost_hlen;
- vb_avail = desc->len - vb_offset;
+
+ desc_addr = gpa_to_vva(dev, desc->addr);
+ if (unlikely(!desc_addr))
+ return -1;
+
+ rte_prefetch0((void *)(uintptr_t)desc_addr);
+
+ desc_offset = 0;
+ desc_avail = desc->len;
+
+ PRINT_PACKET(dev, (uintptr_t)desc_addr, desc->len, 0);
}
- /* Buffer address translation. */
- vb_addr = gpa_to_vva(dev, desc->addr);
- /* Prefetch buffer address. */
- rte_prefetch0((void *)(uintptr_t)vb_addr);
+ /*
+ * This mbuf reaches to its end, get a new one
+ * to hold more data.
+ */
+ if (mbuf_avail == 0) {
+ cur = rte_pktmbuf_alloc(mbuf_pool);
+ if (unlikely(cur == NULL)) {
+ RTE_LOG(ERR, VHOST_DATA, "Failed to "
+ "allocate memory for mbuf.\n");
+ return -1;
+ }
- used_idx = vq->last_used_idx & (vq->size - 1);
+ prev->next = cur;
+ prev->data_len = mbuf_offset;
+ m->nb_segs += 1;
+ m->pkt_len += mbuf_offset;
+ prev = cur;
- 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)]);
+ mbuf_offset = 0;
+ mbuf_avail = cur->buf_len - RTE_PKTMBUF_HEADROOM;
}
+ }
- /* Update used index buffer information. */
- vq->used->ring[used_idx].id = head[entry_success];
- vq->used->ring[used_idx].len = 0;
+ prev->data_len = mbuf_offset;
+ m->pkt_len += mbuf_offset;
- /* Allocate an mbuf and populate the structure. */
- m = rte_pktmbuf_alloc(mbuf_pool);
- if (unlikely(m == NULL)) {
+ if (hdr->flags != 0 || hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE)
+ vhost_dequeue_offload(hdr, m);
+
+ return 0;
+}
+
+uint16_t
+rte_vhost_dequeue_burst(int vid, uint16_t queue_id,
+ struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count)
+{
+ struct virtio_net *dev;
+ struct rte_mbuf *rarp_mbuf = NULL;
+ struct vhost_virtqueue *vq;
+ uint32_t desc_indexes[MAX_PKT_BURST];
+ uint32_t used_idx;
+ uint32_t i = 0;
+ uint16_t free_entries;
+ uint16_t avail_idx;
+
+ dev = get_device(vid);
+ if (!dev)
+ return 0;
+
+ if (unlikely(!is_valid_virt_queue_idx(queue_id, 1, dev->virt_qp_nb))) {
+ RTE_LOG(ERR, VHOST_DATA, "(%d) %s: invalid virtqueue idx %d.\n",
+ dev->vid, __func__, queue_id);
+ return 0;
+ }
+
+ vq = dev->virtqueue[queue_id];
+ if (unlikely(vq->enabled == 0))
+ return 0;
+
+ /*
+ * Construct a RARP broadcast packet, and inject it to the "pkts"
+ * array, to looks like that guest actually send such packet.
+ *
+ * Check user_send_rarp() for more information.
+ */
+ if (unlikely(rte_atomic16_cmpset((volatile uint16_t *)
+ &dev->broadcast_rarp.cnt, 1, 0))) {
+ rarp_mbuf = rte_pktmbuf_alloc(mbuf_pool);
+ if (rarp_mbuf == NULL) {
RTE_LOG(ERR, VHOST_DATA,
"Failed to allocate memory for mbuf.\n");
- break;
+ return 0;
}
- seg_offset = 0;
- seg_avail = m->buf_len - RTE_PKTMBUF_HEADROOM;
- cpy_len = RTE_MIN(vb_avail, seg_avail);
-
- PRINT_PACKET(dev, (uintptr_t)vb_addr, desc->len, 0);
-
- seg_num++;
- cur = m;
- prev = m;
- while (cpy_len != 0) {
- rte_memcpy(rte_pktmbuf_mtod_offset(cur, void *, 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 = cur->buf_len - RTE_PKTMBUF_HEADROOM;
- } 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 = cur->buf_len - RTE_PKTMBUF_HEADROOM;
- }
-
- 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 (make_rarp_packet(rarp_mbuf, &dev->mac)) {
+ rte_pktmbuf_free(rarp_mbuf);
+ rarp_mbuf = NULL;
+ } else {
+ count -= 1;
}
+ }
- if (unlikely(alloc_err == 1))
- break;
+ avail_idx = *((volatile uint16_t *)&vq->avail->idx);
+ free_entries = avail_idx - vq->last_used_idx;
+ if (free_entries == 0)
+ goto out;
+
+ LOG_DEBUG(VHOST_DATA, "(%d) %s\n", dev->vid, __func__);
+
+ /* Prefetch available ring to retrieve head indexes. */
+ used_idx = vq->last_used_idx & (vq->size - 1);
+ rte_prefetch0(&vq->avail->ring[used_idx]);
+ rte_prefetch0(&vq->used->ring[used_idx]);
- m->nb_segs = seg_num;
+ count = RTE_MIN(count, MAX_PKT_BURST);
+ count = RTE_MIN(count, free_entries);
+ LOG_DEBUG(VHOST_DATA, "(%d) about to dequeue %u buffers\n",
+ dev->vid, count);
- pkts[entry_success] = m;
- vq->last_used_idx++;
- entry_success++;
+ /* Retrieve all of the head indexes first to avoid caching issues. */
+ for (i = 0; i < count; i++) {
+ used_idx = (vq->last_used_idx + i) & (vq->size - 1);
+ desc_indexes[i] = vq->avail->ring[used_idx];
+
+ vq->used->ring[used_idx].id = desc_indexes[i];
+ vq->used->ring[used_idx].len = 0;
+ vhost_log_used_vring(dev, vq,
+ offsetof(struct vring_used, ring[used_idx]),
+ sizeof(vq->used->ring[used_idx]));
}
- rte_compiler_barrier();
- vq->used->idx += entry_success;
+ /* Prefetch descriptor index. */
+ rte_prefetch0(&vq->desc[desc_indexes[0]]);
+ for (i = 0; i < count; i++) {
+ int err;
+
+ if (likely(i + 1 < count))
+ rte_prefetch0(&vq->desc[desc_indexes[i + 1]]);
+
+ pkts[i] = rte_pktmbuf_alloc(mbuf_pool);
+ if (unlikely(pkts[i] == NULL)) {
+ RTE_LOG(ERR, VHOST_DATA,
+ "Failed to allocate memory for mbuf.\n");
+ break;
+ }
+ err = copy_desc_to_mbuf(dev, vq, pkts[i], desc_indexes[i],
+ mbuf_pool);
+ if (unlikely(err)) {
+ rte_pktmbuf_free(pkts[i]);
+ break;
+ }
+ }
+
+ rte_smp_wmb();
+ rte_smp_rmb();
+ vq->used->idx += i;
+ vq->last_used_idx += i;
+ vhost_log_used_vring(dev, vq, offsetof(struct vring_used, idx),
+ sizeof(vq->used->idx));
+
/* Kick guest if required. */
- if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT))
- eventfd_write((int)vq->callfd, 1);
- return entry_success;
+ if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT)
+ && (vq->callfd >= 0))
+ eventfd_write(vq->callfd, (eventfd_t)1);
+
+out:
+ if (unlikely(rarp_mbuf != NULL)) {
+ /*
+ * Inject it to the head of "pkts" array, so that switch's mac
+ * learning table will get updated first.
+ */
+ memmove(&pkts[1], pkts, i * sizeof(struct rte_mbuf *));
+ pkts[0] = rarp_mbuf;
+ i += 1;
+ }
+
+ return i;
}
git.droids-corp.org / dpdk.git / blobdiff