X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;f=lib%2Flibrte_vhost%2Fvirtio_net.c;h=21c311732a3b1d1dc43b09e34e222d699a867051;hb=e21ee74082f2b5b358e83fc2df879c2486d633a3;hp=00fcbef3a0c4e73fe696e91132a05e32fcc73e4e;hpb=d6315ce7964d6ac22e73638baffffddde0fa73ff;p=dpdk.git diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c index 00fcbef3a0..21c311732a 100644 --- a/lib/librte_vhost/virtio_net.c +++ b/lib/librte_vhost/virtio_net.c @@ -31,57 +31,25 @@ rxvq_is_mergeable(struct virtio_net *dev) return dev->features & (1ULL << VIRTIO_NET_F_MRG_RXBUF); } -static bool -is_valid_virt_queue_idx(uint32_t idx, int is_tx, uint32_t nr_vring) -{ - return (is_tx ^ (idx & 1)) == 0 && idx < nr_vring; -} - -static __rte_always_inline void * -alloc_copy_ind_table(struct virtio_net *dev, struct vhost_virtqueue *vq, - uint64_t desc_addr, uint64_t desc_len) +static __rte_always_inline bool +virtio_net_is_inorder(struct virtio_net *dev) { - void *idesc; - uint64_t src, dst; - uint64_t len, remain = desc_len; - - idesc = rte_malloc(__func__, desc_len, 0); - if (unlikely(!idesc)) - return 0; - - dst = (uint64_t)(uintptr_t)idesc; - - while (remain) { - len = remain; - src = vhost_iova_to_vva(dev, vq, desc_addr, &len, - VHOST_ACCESS_RO); - if (unlikely(!src || !len)) { - rte_free(idesc); - return 0; - } - - rte_memcpy((void *)(uintptr_t)dst, (void *)(uintptr_t)src, len); - - remain -= len; - dst += len; - desc_addr += len; - } - - return idesc; + return dev->features & (1ULL << VIRTIO_F_IN_ORDER); } -static __rte_always_inline void -free_ind_table(void *idesc) +static bool +is_valid_virt_queue_idx(uint32_t idx, int is_tx, uint32_t nr_vring) { - rte_free(idesc); + return (is_tx ^ (idx & 1)) == 0 && idx < nr_vring; } static __rte_always_inline void -do_flush_shadow_used_ring(struct virtio_net *dev, struct vhost_virtqueue *vq, - uint16_t to, uint16_t from, uint16_t size) +do_flush_shadow_used_ring_split(struct virtio_net *dev, + struct vhost_virtqueue *vq, + uint16_t to, uint16_t from, uint16_t size) { rte_memcpy(&vq->used->ring[to], - &vq->shadow_used_ring[from], + &vq->shadow_used_split[from], size * sizeof(struct vring_used_elem)); vhost_log_cache_used_vring(dev, vq, offsetof(struct vring_used, ring[to]), @@ -89,22 +57,22 @@ do_flush_shadow_used_ring(struct virtio_net *dev, struct vhost_virtqueue *vq, } static __rte_always_inline void -flush_shadow_used_ring(struct virtio_net *dev, struct vhost_virtqueue *vq) +flush_shadow_used_ring_split(struct virtio_net *dev, struct vhost_virtqueue *vq) { uint16_t used_idx = vq->last_used_idx & (vq->size - 1); if (used_idx + vq->shadow_used_idx <= vq->size) { - do_flush_shadow_used_ring(dev, vq, used_idx, 0, + do_flush_shadow_used_ring_split(dev, vq, used_idx, 0, vq->shadow_used_idx); } else { uint16_t size; /* update used ring interval [used_idx, vq->size] */ size = vq->size - used_idx; - do_flush_shadow_used_ring(dev, vq, used_idx, 0, size); + do_flush_shadow_used_ring_split(dev, vq, used_idx, 0, size); /* update the left half used ring interval [0, left_size] */ - do_flush_shadow_used_ring(dev, vq, 0, size, + do_flush_shadow_used_ring_split(dev, vq, 0, size, vq->shadow_used_idx - size); } vq->last_used_idx += vq->shadow_used_idx; @@ -120,13 +88,241 @@ flush_shadow_used_ring(struct virtio_net *dev, struct vhost_virtqueue *vq) } static __rte_always_inline void -update_shadow_used_ring(struct vhost_virtqueue *vq, - uint16_t desc_idx, uint16_t len) +update_shadow_used_ring_split(struct vhost_virtqueue *vq, + uint16_t desc_idx, uint32_t len) { uint16_t i = vq->shadow_used_idx++; - vq->shadow_used_ring[i].id = desc_idx; - vq->shadow_used_ring[i].len = len; + vq->shadow_used_split[i].id = desc_idx; + vq->shadow_used_split[i].len = len; +} + +static __rte_always_inline void +vhost_flush_enqueue_shadow_packed(struct virtio_net *dev, + struct vhost_virtqueue *vq) +{ + int i; + uint16_t used_idx = vq->last_used_idx; + uint16_t head_idx = vq->last_used_idx; + uint16_t head_flags = 0; + + /* Split loop in two to save memory barriers */ + for (i = 0; i < vq->shadow_used_idx; i++) { + vq->desc_packed[used_idx].id = vq->shadow_used_packed[i].id; + vq->desc_packed[used_idx].len = vq->shadow_used_packed[i].len; + + used_idx += vq->shadow_used_packed[i].count; + if (used_idx >= vq->size) + used_idx -= vq->size; + } + + rte_smp_wmb(); + + for (i = 0; i < vq->shadow_used_idx; i++) { + uint16_t flags; + + if (vq->shadow_used_packed[i].len) + flags = VRING_DESC_F_WRITE; + else + flags = 0; + + if (vq->used_wrap_counter) { + flags |= VRING_DESC_F_USED; + flags |= VRING_DESC_F_AVAIL; + } else { + flags &= ~VRING_DESC_F_USED; + flags &= ~VRING_DESC_F_AVAIL; + } + + if (i > 0) { + vq->desc_packed[vq->last_used_idx].flags = flags; + + vhost_log_cache_used_vring(dev, vq, + vq->last_used_idx * + sizeof(struct vring_packed_desc), + sizeof(struct vring_packed_desc)); + } else { + head_idx = vq->last_used_idx; + head_flags = flags; + } + + vq_inc_last_used_packed(vq, vq->shadow_used_packed[i].count); + } + + vq->desc_packed[head_idx].flags = head_flags; + + vhost_log_cache_used_vring(dev, vq, + head_idx * + sizeof(struct vring_packed_desc), + sizeof(struct vring_packed_desc)); + + vq->shadow_used_idx = 0; + vhost_log_cache_sync(dev, vq); +} + +static __rte_always_inline void +vhost_flush_dequeue_shadow_packed(struct virtio_net *dev, + struct vhost_virtqueue *vq) +{ + struct vring_used_elem_packed *used_elem = &vq->shadow_used_packed[0]; + + vq->desc_packed[vq->shadow_last_used_idx].id = used_elem->id; + rte_smp_wmb(); + vq->desc_packed[vq->shadow_last_used_idx].flags = used_elem->flags; + + vhost_log_cache_used_vring(dev, vq, vq->shadow_last_used_idx * + sizeof(struct vring_packed_desc), + sizeof(struct vring_packed_desc)); + vq->shadow_used_idx = 0; + vhost_log_cache_sync(dev, vq); +} + +static __rte_always_inline void +vhost_flush_enqueue_batch_packed(struct virtio_net *dev, + struct vhost_virtqueue *vq, + uint64_t *lens, + uint16_t *ids) +{ + uint16_t i; + uint16_t flags; + + flags = PACKED_DESC_ENQUEUE_USED_FLAG(vq->used_wrap_counter); + + vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) { + vq->desc_packed[vq->last_used_idx + i].id = ids[i]; + vq->desc_packed[vq->last_used_idx + i].len = lens[i]; + } + + rte_smp_wmb(); + + vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) + vq->desc_packed[vq->last_used_idx + i].flags = flags; + + vhost_log_cache_used_vring(dev, vq, vq->last_used_idx * + sizeof(struct vring_packed_desc), + sizeof(struct vring_packed_desc) * + PACKED_BATCH_SIZE); + vhost_log_cache_sync(dev, vq); + + vq_inc_last_used_packed(vq, PACKED_BATCH_SIZE); +} + +static __rte_always_inline void +vhost_shadow_dequeue_batch_packed_inorder(struct vhost_virtqueue *vq, + uint16_t id) +{ + vq->shadow_used_packed[0].id = id; + + if (!vq->shadow_used_idx) { + vq->shadow_last_used_idx = vq->last_used_idx; + vq->shadow_used_packed[0].flags = + PACKED_DESC_DEQUEUE_USED_FLAG(vq->used_wrap_counter); + vq->shadow_used_packed[0].len = 0; + vq->shadow_used_packed[0].count = 1; + vq->shadow_used_idx++; + } + + vq_inc_last_used_packed(vq, PACKED_BATCH_SIZE); +} + +static __rte_always_inline void +vhost_shadow_dequeue_batch_packed(struct virtio_net *dev, + struct vhost_virtqueue *vq, + uint16_t *ids) +{ + uint16_t flags; + uint16_t i; + uint16_t begin; + + flags = PACKED_DESC_DEQUEUE_USED_FLAG(vq->used_wrap_counter); + + if (!vq->shadow_used_idx) { + vq->shadow_last_used_idx = vq->last_used_idx; + vq->shadow_used_packed[0].id = ids[0]; + vq->shadow_used_packed[0].len = 0; + vq->shadow_used_packed[0].count = 1; + vq->shadow_used_packed[0].flags = flags; + vq->shadow_used_idx++; + begin = 1; + } else + begin = 0; + + vhost_for_each_try_unroll(i, begin, PACKED_BATCH_SIZE) { + vq->desc_packed[vq->last_used_idx + i].id = ids[i]; + vq->desc_packed[vq->last_used_idx + i].len = 0; + } + + rte_smp_wmb(); + vhost_for_each_try_unroll(i, begin, PACKED_BATCH_SIZE) + vq->desc_packed[vq->last_used_idx + i].flags = flags; + + vhost_log_cache_used_vring(dev, vq, vq->last_used_idx * + sizeof(struct vring_packed_desc), + sizeof(struct vring_packed_desc) * + PACKED_BATCH_SIZE); + vhost_log_cache_sync(dev, vq); + + vq_inc_last_used_packed(vq, PACKED_BATCH_SIZE); +} + +static __rte_always_inline void +vhost_shadow_dequeue_single_packed(struct vhost_virtqueue *vq, + uint16_t buf_id, + uint16_t count) +{ + uint16_t flags; + + flags = vq->desc_packed[vq->last_used_idx].flags; + if (vq->used_wrap_counter) { + flags |= VRING_DESC_F_USED; + flags |= VRING_DESC_F_AVAIL; + } else { + flags &= ~VRING_DESC_F_USED; + flags &= ~VRING_DESC_F_AVAIL; + } + + if (!vq->shadow_used_idx) { + vq->shadow_last_used_idx = vq->last_used_idx; + + vq->shadow_used_packed[0].id = buf_id; + vq->shadow_used_packed[0].len = 0; + vq->shadow_used_packed[0].flags = flags; + vq->shadow_used_idx++; + } else { + vq->desc_packed[vq->last_used_idx].id = buf_id; + vq->desc_packed[vq->last_used_idx].len = 0; + vq->desc_packed[vq->last_used_idx].flags = flags; + } + + vq_inc_last_used_packed(vq, count); +} + +static __rte_always_inline void +vhost_shadow_dequeue_single_packed_inorder(struct vhost_virtqueue *vq, + uint16_t buf_id, + uint16_t count) +{ + uint16_t flags; + + vq->shadow_used_packed[0].id = buf_id; + + flags = vq->desc_packed[vq->last_used_idx].flags; + if (vq->used_wrap_counter) { + flags |= VRING_DESC_F_USED; + flags |= VRING_DESC_F_AVAIL; + } else { + flags &= ~VRING_DESC_F_USED; + flags &= ~VRING_DESC_F_AVAIL; + } + + if (!vq->shadow_used_idx) { + vq->shadow_last_used_idx = vq->last_used_idx; + vq->shadow_used_packed[0].len = 0; + vq->shadow_used_packed[0].flags = flags; + vq->shadow_used_idx++; + } + + vq_inc_last_used_packed(vq, count); } static inline void @@ -138,9 +334,12 @@ do_data_copy_enqueue(struct virtio_net *dev, struct vhost_virtqueue *vq) for (i = 0; i < count; i++) { rte_memcpy(elem[i].dst, elem[i].src, elem[i].len); - vhost_log_cache_write(dev, vq, elem[i].log_addr, elem[i].len); + vhost_log_cache_write_iova(dev, vq, elem[i].log_addr, + elem[i].len); PRINT_PACKET(dev, (uintptr_t)elem[i].dst, elem[i].len, 0); } + + vq->batch_copy_nb_elems = 0; } static inline void @@ -152,6 +351,54 @@ do_data_copy_dequeue(struct vhost_virtqueue *vq) for (i = 0; i < count; i++) rte_memcpy(elem[i].dst, elem[i].src, elem[i].len); + + vq->batch_copy_nb_elems = 0; +} + +static __rte_always_inline void +vhost_shadow_enqueue_single_packed(struct virtio_net *dev, + struct vhost_virtqueue *vq, + uint32_t len[], + uint16_t id[], + uint16_t count[], + uint16_t num_buffers) +{ + uint16_t i; + for (i = 0; i < num_buffers; i++) { + /* enqueue shadow flush action aligned with batch num */ + if (!vq->shadow_used_idx) + vq->shadow_aligned_idx = vq->last_used_idx & + PACKED_BATCH_MASK; + vq->shadow_used_packed[vq->shadow_used_idx].id = id[i]; + vq->shadow_used_packed[vq->shadow_used_idx].len = len[i]; + vq->shadow_used_packed[vq->shadow_used_idx].count = count[i]; + vq->shadow_aligned_idx += count[i]; + vq->shadow_used_idx++; + } + + if (vq->shadow_aligned_idx >= PACKED_BATCH_SIZE) { + do_data_copy_enqueue(dev, vq); + vhost_flush_enqueue_shadow_packed(dev, vq); + } +} + +static __rte_always_inline void +vhost_flush_dequeue_packed(struct virtio_net *dev, + struct vhost_virtqueue *vq) +{ + int shadow_count; + if (!vq->shadow_used_idx) + return; + + shadow_count = vq->last_used_idx - vq->shadow_last_used_idx; + if (shadow_count <= 0) + shadow_count += vq->size; + + if ((uint32_t)shadow_count >= (vq->size - MAX_PKT_BURST)) { + do_data_copy_dequeue(vq); + vhost_flush_dequeue_shadow_packed(dev, vq); + vhost_vring_call_packed(dev, vq); + } } /* avoid write operation when necessary, to lessen cache issues */ @@ -174,15 +421,15 @@ virtio_enqueue_offload(struct rte_mbuf *m_buf, struct virtio_net_hdr *net_hdr) switch (csum_l4) { case PKT_TX_TCP_CKSUM: - net_hdr->csum_offset = (offsetof(struct tcp_hdr, + net_hdr->csum_offset = (offsetof(struct rte_tcp_hdr, cksum)); break; case PKT_TX_UDP_CKSUM: - net_hdr->csum_offset = (offsetof(struct udp_hdr, + net_hdr->csum_offset = (offsetof(struct rte_udp_hdr, dgram_cksum)); break; case PKT_TX_SCTP_CKSUM: - net_hdr->csum_offset = (offsetof(struct sctp_hdr, + net_hdr->csum_offset = (offsetof(struct rte_sctp_hdr, cksum)); break; } @@ -194,10 +441,11 @@ virtio_enqueue_offload(struct rte_mbuf *m_buf, struct virtio_net_hdr *net_hdr) /* IP cksum verification cannot be bypassed, then calculate here */ if (m_buf->ol_flags & PKT_TX_IP_CKSUM) { - struct ipv4_hdr *ipv4_hdr; + struct rte_ipv4_hdr *ipv4_hdr; - ipv4_hdr = rte_pktmbuf_mtod_offset(m_buf, struct ipv4_hdr *, + ipv4_hdr = rte_pktmbuf_mtod_offset(m_buf, struct rte_ipv4_hdr *, m_buf->l2_len); + ipv4_hdr->hdr_checksum = 0; ipv4_hdr->hdr_checksum = rte_ipv4_cksum(ipv4_hdr); } @@ -222,22 +470,67 @@ virtio_enqueue_offload(struct rte_mbuf *m_buf, struct virtio_net_hdr *net_hdr) } static __rte_always_inline int -fill_vec_buf(struct virtio_net *dev, struct vhost_virtqueue *vq, - uint32_t avail_idx, uint32_t *vec_idx, +map_one_desc(struct virtio_net *dev, struct vhost_virtqueue *vq, + struct buf_vector *buf_vec, uint16_t *vec_idx, + uint64_t desc_iova, uint64_t desc_len, uint8_t perm) +{ + uint16_t vec_id = *vec_idx; + + while (desc_len) { + uint64_t desc_addr; + uint64_t desc_chunck_len = desc_len; + + if (unlikely(vec_id >= BUF_VECTOR_MAX)) + return -1; + + desc_addr = vhost_iova_to_vva(dev, vq, + desc_iova, + &desc_chunck_len, + perm); + if (unlikely(!desc_addr)) + return -1; + + rte_prefetch0((void *)(uintptr_t)desc_addr); + + buf_vec[vec_id].buf_iova = desc_iova; + buf_vec[vec_id].buf_addr = desc_addr; + buf_vec[vec_id].buf_len = desc_chunck_len; + + desc_len -= desc_chunck_len; + desc_iova += desc_chunck_len; + vec_id++; + } + *vec_idx = vec_id; + + return 0; +} + +static __rte_always_inline int +fill_vec_buf_split(struct virtio_net *dev, struct vhost_virtqueue *vq, + uint32_t avail_idx, uint16_t *vec_idx, struct buf_vector *buf_vec, uint16_t *desc_chain_head, - uint16_t *desc_chain_len, uint8_t perm) + uint32_t *desc_chain_len, uint8_t perm) { uint16_t idx = vq->avail->ring[avail_idx & (vq->size - 1)]; - uint32_t vec_id = *vec_idx; + uint16_t vec_id = *vec_idx; uint32_t len = 0; - uint64_t dlen, desc_avail, desc_iova; + uint64_t dlen; + uint32_t nr_descs = vq->size; + uint32_t cnt = 0; struct vring_desc *descs = vq->desc; struct vring_desc *idesc = NULL; + if (unlikely(idx >= vq->size)) + return -1; + *desc_chain_head = idx; if (vq->desc[idx].flags & VRING_DESC_F_INDIRECT) { dlen = vq->desc[idx].len; + nr_descs = dlen / sizeof(struct vring_desc); + if (unlikely(nr_descs > vq->size)) + return -1; + descs = (struct vring_desc *)(uintptr_t) vhost_iova_to_vva(dev, vq, vq->desc[idx].addr, &dlen, @@ -250,7 +543,7 @@ fill_vec_buf(struct virtio_net *dev, struct vhost_virtqueue *vq, * The indirect desc table is not contiguous * in process VA space, we have to copy it. */ - idesc = alloc_copy_ind_table(dev, vq, + idesc = vhost_alloc_copy_ind_table(dev, vq, vq->desc[idx].addr, vq->desc[idx].len); if (unlikely(!idesc)) return -1; @@ -262,42 +555,18 @@ fill_vec_buf(struct virtio_net *dev, struct vhost_virtqueue *vq, } while (1) { - if (unlikely(idx >= vq->size)) { + if (unlikely(idx >= nr_descs || cnt++ >= nr_descs)) { free_ind_table(idesc); return -1; } - len += descs[idx].len; - desc_avail = descs[idx].len; - desc_iova = descs[idx].addr; - - while (desc_avail) { - uint64_t desc_addr; - uint64_t desc_chunck_len = desc_avail; - - if (unlikely(vec_id >= BUF_VECTOR_MAX)) { - free_ind_table(idesc); - return -1; - } - - desc_addr = vhost_iova_to_vva(dev, vq, - desc_iova, - &desc_chunck_len, - perm); - if (unlikely(!desc_addr)) { - free_ind_table(idesc); - return -1; - } - buf_vec[vec_id].buf_iova = desc_iova; - buf_vec[vec_id].buf_addr = desc_addr; - buf_vec[vec_id].buf_len = desc_chunck_len; - buf_vec[vec_id].desc_idx = idx; - - desc_avail -= desc_chunck_len; - desc_iova += desc_chunck_len; - vec_id++; + if (unlikely(map_one_desc(dev, vq, buf_vec, &vec_id, + descs[idx].addr, descs[idx].len, + perm))) { + free_ind_table(idesc); + return -1; } if ((descs[idx].flags & VRING_DESC_F_NEXT) == 0) @@ -319,56 +588,206 @@ fill_vec_buf(struct virtio_net *dev, struct vhost_virtqueue *vq, * Returns -1 on fail, 0 on success */ static inline int -reserve_avail_buf(struct virtio_net *dev, struct vhost_virtqueue *vq, +reserve_avail_buf_split(struct virtio_net *dev, struct vhost_virtqueue *vq, uint32_t size, struct buf_vector *buf_vec, uint16_t *num_buffers, uint16_t avail_head, uint16_t *nr_vec) { uint16_t cur_idx; - uint32_t vec_idx = 0; + uint16_t vec_idx = 0; uint16_t max_tries, tries = 0; uint16_t head_idx = 0; - uint16_t len = 0; + uint32_t len = 0; *num_buffers = 0; cur_idx = vq->last_avail_idx; if (rxvq_is_mergeable(dev)) - max_tries = vq->size; + max_tries = vq->size - 1; else max_tries = 1; while (size > 0) { if (unlikely(cur_idx == avail_head)) return -1; + /* + * if we tried all available ring items, and still + * can't get enough buf, it means something abnormal + * happened. + */ + if (unlikely(++tries > max_tries)) + return -1; - if (unlikely(fill_vec_buf(dev, vq, cur_idx, &vec_idx, buf_vec, + if (unlikely(fill_vec_buf_split(dev, vq, cur_idx, + &vec_idx, buf_vec, &head_idx, &len, VHOST_ACCESS_RW) < 0)) return -1; len = RTE_MIN(len, size); - update_shadow_used_ring(vq, head_idx, len); + update_shadow_used_ring_split(vq, head_idx, len); size -= len; cur_idx++; - tries++; *num_buffers += 1; + } + + *nr_vec = vec_idx; + + return 0; +} +static __rte_always_inline int +fill_vec_buf_packed_indirect(struct virtio_net *dev, + struct vhost_virtqueue *vq, + struct vring_packed_desc *desc, uint16_t *vec_idx, + struct buf_vector *buf_vec, uint32_t *len, uint8_t perm) +{ + uint16_t i; + uint32_t nr_descs; + uint16_t vec_id = *vec_idx; + uint64_t dlen; + struct vring_packed_desc *descs, *idescs = NULL; + + dlen = desc->len; + descs = (struct vring_packed_desc *)(uintptr_t) + vhost_iova_to_vva(dev, vq, desc->addr, &dlen, VHOST_ACCESS_RO); + if (unlikely(!descs)) + return -1; + + if (unlikely(dlen < desc->len)) { /* - * if we tried all available ring items, and still - * can't get enough buf, it means something abnormal - * happened. + * The indirect desc table is not contiguous + * in process VA space, we have to copy it. */ - if (unlikely(tries > max_tries)) + idescs = vhost_alloc_copy_ind_table(dev, + vq, desc->addr, desc->len); + if (unlikely(!idescs)) return -1; + + descs = idescs; } - *nr_vec = vec_idx; + nr_descs = desc->len / sizeof(struct vring_packed_desc); + if (unlikely(nr_descs >= vq->size)) { + free_ind_table(idescs); + return -1; + } + + for (i = 0; i < nr_descs; i++) { + if (unlikely(vec_id >= BUF_VECTOR_MAX)) { + free_ind_table(idescs); + return -1; + } + + *len += descs[i].len; + if (unlikely(map_one_desc(dev, vq, buf_vec, &vec_id, + descs[i].addr, descs[i].len, + perm))) + return -1; + } + *vec_idx = vec_id; + + if (unlikely(!!idescs)) + free_ind_table(idescs); + + return 0; +} + +static __rte_always_inline int +fill_vec_buf_packed(struct virtio_net *dev, struct vhost_virtqueue *vq, + uint16_t avail_idx, uint16_t *desc_count, + struct buf_vector *buf_vec, uint16_t *vec_idx, + uint16_t *buf_id, uint32_t *len, uint8_t perm) +{ + bool wrap_counter = vq->avail_wrap_counter; + struct vring_packed_desc *descs = vq->desc_packed; + uint16_t vec_id = *vec_idx; + + if (avail_idx < vq->last_avail_idx) + wrap_counter ^= 1; + + /* + * Perform a load-acquire barrier in desc_is_avail to + * enforce the ordering between desc flags and desc + * content. + */ + if (unlikely(!desc_is_avail(&descs[avail_idx], wrap_counter))) + return -1; + + *desc_count = 0; + *len = 0; + + while (1) { + if (unlikely(vec_id >= BUF_VECTOR_MAX)) + return -1; + + if (unlikely(*desc_count >= vq->size)) + return -1; + + *desc_count += 1; + *buf_id = descs[avail_idx].id; + + if (descs[avail_idx].flags & VRING_DESC_F_INDIRECT) { + if (unlikely(fill_vec_buf_packed_indirect(dev, vq, + &descs[avail_idx], + &vec_id, buf_vec, + len, perm) < 0)) + return -1; + } else { + *len += descs[avail_idx].len; + + if (unlikely(map_one_desc(dev, vq, buf_vec, &vec_id, + descs[avail_idx].addr, + descs[avail_idx].len, + perm))) + return -1; + } + + if ((descs[avail_idx].flags & VRING_DESC_F_NEXT) == 0) + break; + + if (++avail_idx >= vq->size) { + avail_idx -= vq->size; + wrap_counter ^= 1; + } + } + + *vec_idx = vec_id; return 0; } +static __rte_noinline void +copy_vnet_hdr_to_desc(struct virtio_net *dev, struct vhost_virtqueue *vq, + struct buf_vector *buf_vec, + struct virtio_net_hdr_mrg_rxbuf *hdr) +{ + uint64_t len; + uint64_t remain = dev->vhost_hlen; + uint64_t src = (uint64_t)(uintptr_t)hdr, dst; + uint64_t iova = buf_vec->buf_iova; + + while (remain) { + len = RTE_MIN(remain, + buf_vec->buf_len); + dst = buf_vec->buf_addr; + rte_memcpy((void *)(uintptr_t)dst, + (void *)(uintptr_t)src, + len); + + PRINT_PACKET(dev, (uintptr_t)dst, + (uint32_t)len, 0); + vhost_log_cache_write_iova(dev, vq, + iova, len); + + remain -= len; + iova += len; + src += len; + buf_vec++; + } +} + static __rte_always_inline int copy_mbuf_to_desc(struct virtio_net *dev, struct vhost_virtqueue *vq, struct rte_mbuf *m, struct buf_vector *buf_vec, @@ -394,9 +813,6 @@ copy_mbuf_to_desc(struct virtio_net *dev, struct vhost_virtqueue *vq, buf_iova = buf_vec[vec_idx].buf_iova; buf_len = buf_vec[vec_idx].buf_len; - if (nr_vec > 1) - rte_prefetch0((void *)(uintptr_t)buf_vec[1].buf_addr); - if (unlikely(buf_len < dev->vhost_hlen && nr_vec <= 1)) { error = -1; goto out; @@ -439,10 +855,6 @@ copy_mbuf_to_desc(struct virtio_net *dev, struct vhost_virtqueue *vq, buf_iova = buf_vec[vec_idx].buf_iova; buf_len = buf_vec[vec_idx].buf_len; - /* Prefetch next buffer address. */ - if (vec_idx + 1 < nr_vec) - rte_prefetch0((void *)(uintptr_t) - buf_vec[vec_idx + 1].buf_addr); buf_offset = 0; buf_avail = buf_len; } @@ -462,33 +874,11 @@ copy_mbuf_to_desc(struct virtio_net *dev, struct vhost_virtqueue *vq, num_buffers); if (unlikely(hdr == &tmp_hdr)) { - uint64_t len; - uint64_t remain = dev->vhost_hlen; - uint64_t src = (uint64_t)(uintptr_t)hdr, dst; - uint64_t iova = buf_vec[0].buf_iova; - uint16_t hdr_vec_idx = 0; - - while (remain) { - len = remain; - dst = buf_vec[hdr_vec_idx].buf_addr; - rte_memcpy((void *)(uintptr_t)dst, - (void *)(uintptr_t)src, - len); - - PRINT_PACKET(dev, (uintptr_t)dst, - (uint32_t)len, 0); - vhost_log_cache_write(dev, vq, - iova, len); - - remain -= len; - iova += len; - src += len; - hdr_vec_idx++; - } + copy_vnet_hdr_to_desc(dev, vq, buf_vec, hdr); } else { PRINT_PACKET(dev, (uintptr_t)hdr_addr, dev->vhost_hlen, 0); - vhost_log_cache_write(dev, vq, + vhost_log_cache_write_iova(dev, vq, buf_vec[0].buf_iova, dev->vhost_hlen); } @@ -496,15 +886,16 @@ copy_mbuf_to_desc(struct virtio_net *dev, struct vhost_virtqueue *vq, hdr_addr = 0; } - cpy_len = RTE_MIN(buf_len, mbuf_avail); + cpy_len = RTE_MIN(buf_avail, mbuf_avail); if (likely(cpy_len > MAX_BATCH_LEN || vq->batch_copy_nb_elems >= vq->size)) { rte_memcpy((void *)((uintptr_t)(buf_addr + buf_offset)), rte_pktmbuf_mtod_offset(m, void *, mbuf_offset), cpy_len); - vhost_log_cache_write(dev, vq, buf_iova + buf_offset, - cpy_len); + vhost_log_cache_write_iova(dev, vq, + buf_iova + buf_offset, + cpy_len); PRINT_PACKET(dev, (uintptr_t)(buf_addr + buf_offset), cpy_len, 0); } else { @@ -529,51 +920,93 @@ out: return error; } -static __rte_always_inline uint32_t -virtio_dev_rx(struct virtio_net *dev, uint16_t queue_id, - struct rte_mbuf **pkts, uint32_t count) +static __rte_always_inline int +vhost_enqueue_single_packed(struct virtio_net *dev, + struct vhost_virtqueue *vq, + struct rte_mbuf *pkt, + struct buf_vector *buf_vec, + uint16_t *nr_descs) { - struct vhost_virtqueue *vq; - uint32_t pkt_idx = 0; - uint16_t num_buffers; - struct buf_vector buf_vec[BUF_VECTOR_MAX]; - uint16_t avail_head; - - VHOST_LOG_DEBUG(VHOST_DATA, "(%d) %s\n", dev->vid, __func__); - if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->nr_vring))) { - RTE_LOG(ERR, VHOST_DATA, "(%d) %s: invalid virtqueue idx %d.\n", - dev->vid, __func__, queue_id); - return 0; - } + uint16_t nr_vec = 0; + uint16_t avail_idx = vq->last_avail_idx; + uint16_t max_tries, tries = 0; + uint16_t buf_id = 0; + uint32_t len = 0; + uint16_t desc_count; + uint32_t size = pkt->pkt_len + dev->vhost_hlen; + uint16_t num_buffers = 0; + uint32_t buffer_len[vq->size]; + uint16_t buffer_buf_id[vq->size]; + uint16_t buffer_desc_count[vq->size]; - vq = dev->virtqueue[queue_id]; + if (rxvq_is_mergeable(dev)) + max_tries = vq->size - 1; + else + max_tries = 1; - rte_spinlock_lock(&vq->access_lock); + while (size > 0) { + /* + * if we tried all available ring items, and still + * can't get enough buf, it means something abnormal + * happened. + */ + if (unlikely(++tries > max_tries)) + return -1; - if (unlikely(vq->enabled == 0)) - goto out_access_unlock; + if (unlikely(fill_vec_buf_packed(dev, vq, + avail_idx, &desc_count, + buf_vec, &nr_vec, + &buf_id, &len, + VHOST_ACCESS_RW) < 0)) + return -1; - if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)) - vhost_user_iotlb_rd_lock(vq); + len = RTE_MIN(len, size); + size -= len; - if (unlikely(vq->access_ok == 0)) - if (unlikely(vring_translate(dev, vq) < 0)) - goto out; + buffer_len[num_buffers] = len; + buffer_buf_id[num_buffers] = buf_id; + buffer_desc_count[num_buffers] = desc_count; + num_buffers += 1; - count = RTE_MIN((uint32_t)MAX_PKT_BURST, count); - if (count == 0) - goto out; + *nr_descs += desc_count; + avail_idx += desc_count; + if (avail_idx >= vq->size) + avail_idx -= vq->size; + } - vq->batch_copy_nb_elems = 0; + if (copy_mbuf_to_desc(dev, vq, pkt, buf_vec, nr_vec, num_buffers) < 0) + return -1; - rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]); + vhost_shadow_enqueue_single_packed(dev, vq, buffer_len, buffer_buf_id, + buffer_desc_count, num_buffers); + + return 0; +} + +static __rte_noinline uint32_t +virtio_dev_rx_split(struct virtio_net *dev, struct vhost_virtqueue *vq, + struct rte_mbuf **pkts, uint32_t count) +{ + uint32_t pkt_idx = 0; + uint16_t num_buffers; + struct buf_vector buf_vec[BUF_VECTOR_MAX]; + uint16_t avail_head; avail_head = *((volatile uint16_t *)&vq->avail->idx); + + /* + * The ordering between avail index and + * desc reads needs to be enforced. + */ + rte_smp_rmb(); + + rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]); + for (pkt_idx = 0; pkt_idx < count; pkt_idx++) { uint32_t pkt_len = pkts[pkt_idx]->pkt_len + dev->vhost_hlen; uint16_t nr_vec = 0; - if (unlikely(reserve_avail_buf(dev, vq, + if (unlikely(reserve_avail_buf_split(dev, vq, pkt_len, buf_vec, &num_buffers, avail_head, &nr_vec) < 0)) { VHOST_LOG_DEBUG(VHOST_DATA, @@ -583,8 +1016,6 @@ virtio_dev_rx(struct virtio_net *dev, uint16_t queue_id, break; } - rte_prefetch0((void *)(uintptr_t)buf_vec[0].buf_addr); - VHOST_LOG_DEBUG(VHOST_DATA, "(%d) current index %d | end index %d\n", dev->vid, vq->last_avail_idx, vq->last_avail_idx + num_buffers); @@ -602,10 +1033,195 @@ virtio_dev_rx(struct virtio_net *dev, uint16_t queue_id, do_data_copy_enqueue(dev, vq); if (likely(vq->shadow_used_idx)) { - flush_shadow_used_ring(dev, vq); - vhost_vring_call(dev, vq); + flush_shadow_used_ring_split(dev, vq); + vhost_vring_call_split(dev, vq); + } + + return pkt_idx; +} + +static __rte_always_inline int +virtio_dev_rx_batch_packed(struct virtio_net *dev, + struct vhost_virtqueue *vq, + struct rte_mbuf **pkts) +{ + bool wrap_counter = vq->avail_wrap_counter; + struct vring_packed_desc *descs = vq->desc_packed; + uint16_t avail_idx = vq->last_avail_idx; + uint64_t desc_addrs[PACKED_BATCH_SIZE]; + struct virtio_net_hdr_mrg_rxbuf *hdrs[PACKED_BATCH_SIZE]; + uint32_t buf_offset = dev->vhost_hlen; + uint64_t lens[PACKED_BATCH_SIZE]; + uint16_t ids[PACKED_BATCH_SIZE]; + uint16_t i; + + if (unlikely(avail_idx & PACKED_BATCH_MASK)) + return -1; + + if (unlikely((avail_idx + PACKED_BATCH_SIZE) > vq->size)) + return -1; + + vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) { + if (unlikely(pkts[i]->next != NULL)) + return -1; + if (unlikely(!desc_is_avail(&descs[avail_idx + i], + wrap_counter))) + return -1; + } + + rte_smp_rmb(); + + vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) + lens[i] = descs[avail_idx + i].len; + + vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) { + if (unlikely(pkts[i]->pkt_len > (lens[i] - buf_offset))) + return -1; + } + + vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) + desc_addrs[i] = vhost_iova_to_vva(dev, vq, + descs[avail_idx + i].addr, + &lens[i], + VHOST_ACCESS_RW); + + vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) { + if (unlikely(lens[i] != descs[avail_idx + i].len)) + return -1; + } + + vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) { + rte_prefetch0((void *)(uintptr_t)desc_addrs[i]); + hdrs[i] = (struct virtio_net_hdr_mrg_rxbuf *) + (uintptr_t)desc_addrs[i]; + lens[i] = pkts[i]->pkt_len + dev->vhost_hlen; + } + + vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) + virtio_enqueue_offload(pkts[i], &hdrs[i]->hdr); + + vq_inc_last_avail_packed(vq, PACKED_BATCH_SIZE); + + vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) { + rte_memcpy((void *)(uintptr_t)(desc_addrs[i] + buf_offset), + rte_pktmbuf_mtod_offset(pkts[i], void *, 0), + pkts[i]->pkt_len); + } + + vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) + vhost_log_cache_write_iova(dev, vq, descs[avail_idx + i].addr, + lens[i]); + + vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) + ids[i] = descs[avail_idx + i].id; + + vhost_flush_enqueue_batch_packed(dev, vq, lens, ids); + + return 0; +} + +static __rte_always_inline int16_t +virtio_dev_rx_single_packed(struct virtio_net *dev, + struct vhost_virtqueue *vq, + struct rte_mbuf *pkt) +{ + struct buf_vector buf_vec[BUF_VECTOR_MAX]; + uint16_t nr_descs = 0; + + rte_smp_rmb(); + if (unlikely(vhost_enqueue_single_packed(dev, vq, pkt, buf_vec, + &nr_descs) < 0)) { + VHOST_LOG_DEBUG(VHOST_DATA, + "(%d) failed to get enough desc from vring\n", + dev->vid); + return -1; + } + + VHOST_LOG_DEBUG(VHOST_DATA, "(%d) current index %d | end index %d\n", + dev->vid, vq->last_avail_idx, + vq->last_avail_idx + nr_descs); + + vq_inc_last_avail_packed(vq, nr_descs); + + return 0; +} + +static __rte_noinline uint32_t +virtio_dev_rx_packed(struct virtio_net *dev, + struct vhost_virtqueue *vq, + struct rte_mbuf **pkts, + uint32_t count) +{ + uint32_t pkt_idx = 0; + uint32_t remained = count; + + do { + rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]); + + if (remained >= PACKED_BATCH_SIZE) { + if (!virtio_dev_rx_batch_packed(dev, vq, + &pkts[pkt_idx])) { + pkt_idx += PACKED_BATCH_SIZE; + remained -= PACKED_BATCH_SIZE; + continue; + } + } + + if (virtio_dev_rx_single_packed(dev, vq, pkts[pkt_idx])) + break; + pkt_idx++; + remained--; + + } while (pkt_idx < count); + + if (vq->shadow_used_idx) { + do_data_copy_enqueue(dev, vq); + vhost_flush_enqueue_shadow_packed(dev, vq); + } + + if (pkt_idx) + vhost_vring_call_packed(dev, vq); + + return pkt_idx; +} + +static __rte_always_inline uint32_t +virtio_dev_rx(struct virtio_net *dev, uint16_t queue_id, + struct rte_mbuf **pkts, uint32_t count) +{ + struct vhost_virtqueue *vq; + uint32_t nb_tx = 0; + + VHOST_LOG_DEBUG(VHOST_DATA, "(%d) %s\n", dev->vid, __func__); + if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->nr_vring))) { + RTE_LOG(ERR, VHOST_DATA, "(%d) %s: invalid virtqueue idx %d.\n", + dev->vid, __func__, queue_id); + return 0; } + vq = dev->virtqueue[queue_id]; + + rte_spinlock_lock(&vq->access_lock); + + if (unlikely(vq->enabled == 0)) + goto out_access_unlock; + + if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)) + vhost_user_iotlb_rd_lock(vq); + + if (unlikely(vq->access_ok == 0)) + if (unlikely(vring_translate(dev, vq) < 0)) + goto out; + + count = RTE_MIN((uint32_t)MAX_PKT_BURST, count); + if (count == 0) + goto out; + + if (vq_is_packed(dev)) + nb_tx = virtio_dev_rx_packed(dev, vq, pkts, count); + else + nb_tx = virtio_dev_rx_split(dev, vq, pkts, count); + out: if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)) vhost_user_iotlb_rd_unlock(vq); @@ -613,7 +1229,7 @@ out: out_access_unlock: rte_spinlock_unlock(&vq->access_lock); - return pkt_idx; + return nb_tx; } uint16_t @@ -652,38 +1268,39 @@ virtio_net_with_host_offload(struct virtio_net *dev) static void parse_ethernet(struct rte_mbuf *m, uint16_t *l4_proto, void **l4_hdr) { - struct ipv4_hdr *ipv4_hdr; - struct ipv6_hdr *ipv6_hdr; + struct rte_ipv4_hdr *ipv4_hdr; + struct rte_ipv6_hdr *ipv6_hdr; void *l3_hdr = NULL; - struct ether_hdr *eth_hdr; + struct rte_ether_hdr *eth_hdr; uint16_t ethertype; - eth_hdr = rte_pktmbuf_mtod(m, struct ether_hdr *); + eth_hdr = rte_pktmbuf_mtod(m, struct rte_ether_hdr *); - m->l2_len = sizeof(struct ether_hdr); + m->l2_len = sizeof(struct rte_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); + if (ethertype == RTE_ETHER_TYPE_VLAN) { + struct rte_vlan_hdr *vlan_hdr = + (struct rte_vlan_hdr *)(eth_hdr + 1); - m->l2_len += sizeof(struct vlan_hdr); + m->l2_len += sizeof(struct rte_vlan_hdr); ethertype = rte_be_to_cpu_16(vlan_hdr->eth_proto); } l3_hdr = (char *)eth_hdr + m->l2_len; switch (ethertype) { - case ETHER_TYPE_IPv4: + case RTE_ETHER_TYPE_IPV4: 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: + case RTE_ETHER_TYPE_IPV6: ipv6_hdr = l3_hdr; *l4_proto = ipv6_hdr->proto; - m->l3_len = sizeof(struct ipv6_hdr); + m->l3_len = sizeof(struct rte_ipv6_hdr); *l4_hdr = (char *)l3_hdr + m->l3_len; m->ol_flags |= PKT_TX_IPV6; break; @@ -700,7 +1317,7 @@ 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; + struct rte_tcp_hdr *tcp_hdr = NULL; if (hdr->flags == 0 && hdr->gso_type == VIRTIO_NET_HDR_GSO_NONE) return; @@ -709,15 +1326,15 @@ vhost_dequeue_offload(struct virtio_net_hdr *hdr, struct rte_mbuf *m) 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)): + case (offsetof(struct rte_tcp_hdr, cksum)): if (l4_proto == IPPROTO_TCP) m->ol_flags |= PKT_TX_TCP_CKSUM; break; - case (offsetof(struct udp_hdr, dgram_cksum)): + case (offsetof(struct rte_udp_hdr, dgram_cksum)): if (l4_proto == IPPROTO_UDP) m->ol_flags |= PKT_TX_UDP_CKSUM; break; - case (offsetof(struct sctp_hdr, cksum)): + case (offsetof(struct rte_sctp_hdr, cksum)): if (l4_proto == IPPROTO_SCTP) m->ol_flags |= PKT_TX_SCTP_CKSUM; break; @@ -739,7 +1356,7 @@ vhost_dequeue_offload(struct virtio_net_hdr *hdr, struct rte_mbuf *m) case VIRTIO_NET_HDR_GSO_UDP: m->ol_flags |= PKT_TX_UDP_SEG; m->tso_segsz = hdr->gso_size; - m->l4_len = sizeof(struct udp_hdr); + m->l4_len = sizeof(struct rte_udp_hdr); break; default: RTE_LOG(WARNING, VHOST_DATA, @@ -749,10 +1366,25 @@ vhost_dequeue_offload(struct virtio_net_hdr *hdr, struct rte_mbuf *m) } } -static __rte_always_inline void -put_zmbuf(struct zcopy_mbuf *zmbuf) +static __rte_noinline void +copy_vnet_hdr_from_desc(struct virtio_net_hdr *hdr, + struct buf_vector *buf_vec) { - zmbuf->in_use = 0; + uint64_t len; + uint64_t remain = sizeof(struct virtio_net_hdr); + uint64_t src; + uint64_t dst = (uint64_t)(uintptr_t)hdr; + + while (remain) { + len = RTE_MIN(remain, buf_vec->buf_len); + src = buf_vec->buf_addr; + rte_memcpy((void *)(uintptr_t)dst, + (void *)(uintptr_t)src, len); + + remain -= len; + dst += len; + buf_vec++; + } } static __rte_always_inline int @@ -781,36 +1413,16 @@ copy_desc_to_mbuf(struct virtio_net *dev, struct vhost_virtqueue *vq, goto out; } - if (likely(nr_vec > 1)) - rte_prefetch0((void *)(uintptr_t)buf_vec[1].buf_addr); - if (virtio_net_with_host_offload(dev)) { if (unlikely(buf_len < sizeof(struct virtio_net_hdr))) { - uint64_t len; - uint64_t remain = sizeof(struct virtio_net_hdr); - uint64_t src; - uint64_t dst = (uint64_t)(uintptr_t)&tmp_hdr; - uint16_t hdr_vec_idx = 0; - /* * No luck, the virtio-net header doesn't fit * in a contiguous virtual area. */ - while (remain) { - len = remain; - src = buf_vec[hdr_vec_idx].buf_addr; - rte_memcpy((void *)(uintptr_t)dst, - (void *)(uintptr_t)src, len); - - remain -= len; - dst += len; - hdr_vec_idx++; - } - + copy_vnet_hdr_from_desc(&tmp_hdr, buf_vec); hdr = &tmp_hdr; } else { hdr = (struct virtio_net_hdr *)((uintptr_t)buf_addr); - rte_prefetch0(hdr); } } @@ -840,9 +1452,6 @@ copy_desc_to_mbuf(struct virtio_net *dev, struct vhost_virtqueue *vq, buf_avail = buf_vec[vec_idx].buf_len - dev->vhost_hlen; } - rte_prefetch0((void *)(uintptr_t) - (buf_addr + buf_offset)); - PRINT_PACKET(dev, (uintptr_t)(buf_addr + buf_offset), (uint32_t)buf_avail, 0); @@ -908,14 +1517,6 @@ copy_desc_to_mbuf(struct virtio_net *dev, struct vhost_virtqueue *vq, buf_iova = buf_vec[vec_idx].buf_iova; buf_len = buf_vec[vec_idx].buf_len; - /* - * Prefecth desc n + 1 buffer while - * desc n buffer is processed. - */ - if (vec_idx + 1 < nr_vec) - rte_prefetch0((void *)(uintptr_t) - buf_vec[vec_idx + 1].buf_addr); - buf_offset = 0; buf_avail = buf_len; @@ -991,90 +1592,113 @@ again: return NULL; } -static __rte_always_inline bool -mbuf_is_consumed(struct rte_mbuf *m) +static void +virtio_dev_extbuf_free(void *addr __rte_unused, void *opaque) { - while (m) { - if (rte_mbuf_refcnt_read(m) > 1) - return false; - m = m->next; - } - - return true; + rte_free(opaque); } -static __rte_always_inline void -restore_mbuf(struct rte_mbuf *m) +static int +virtio_dev_extbuf_alloc(struct rte_mbuf *pkt, uint32_t size) { - uint32_t mbuf_size, priv_size; + struct rte_mbuf_ext_shared_info *shinfo = NULL; + uint32_t total_len = RTE_PKTMBUF_HEADROOM + size; + uint16_t buf_len; + rte_iova_t iova; + void *buf; + + /* Try to use pkt buffer to store shinfo to reduce the amount of memory + * required, otherwise store shinfo in the new buffer. + */ + if (rte_pktmbuf_tailroom(pkt) >= sizeof(*shinfo)) + shinfo = rte_pktmbuf_mtod(pkt, + struct rte_mbuf_ext_shared_info *); + else { + total_len += sizeof(*shinfo) + sizeof(uintptr_t); + total_len = RTE_ALIGN_CEIL(total_len, sizeof(uintptr_t)); + } - while (m) { - priv_size = rte_pktmbuf_priv_size(m->pool); - mbuf_size = sizeof(struct rte_mbuf) + priv_size; - /* start of buffer is after mbuf structure and priv data */ + if (unlikely(total_len > UINT16_MAX)) + return -ENOSPC; - m->buf_addr = (char *)m + mbuf_size; - m->buf_iova = rte_mempool_virt2iova(m) + mbuf_size; - m = m->next; + buf_len = total_len; + buf = rte_malloc(NULL, buf_len, RTE_CACHE_LINE_SIZE); + if (unlikely(buf == NULL)) + return -ENOMEM; + + /* Initialize shinfo */ + if (shinfo) { + shinfo->free_cb = virtio_dev_extbuf_free; + shinfo->fcb_opaque = buf; + rte_mbuf_ext_refcnt_set(shinfo, 1); + } else { + shinfo = rte_pktmbuf_ext_shinfo_init_helper(buf, &buf_len, + virtio_dev_extbuf_free, buf); + if (unlikely(shinfo == NULL)) { + rte_free(buf); + RTE_LOG(ERR, VHOST_DATA, "Failed to init shinfo\n"); + return -1; + } } + + iova = rte_malloc_virt2iova(buf); + rte_pktmbuf_attach_extbuf(pkt, buf, iova, buf_len, shinfo); + rte_pktmbuf_reset_headroom(pkt); + + 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) +/* + * Allocate a host supported pktmbuf. + */ +static __rte_always_inline struct rte_mbuf * +virtio_dev_pktmbuf_alloc(struct virtio_net *dev, struct rte_mempool *mp, + uint32_t data_len) { - struct virtio_net *dev; - struct rte_mbuf *rarp_mbuf = NULL; - struct vhost_virtqueue *vq; - uint32_t i = 0; - uint16_t free_entries; - - dev = get_device(vid); - if (!dev) - return 0; + struct rte_mbuf *pkt = rte_pktmbuf_alloc(mp); - if (unlikely(!(dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET))) { + if (unlikely(pkt == NULL)) { RTE_LOG(ERR, VHOST_DATA, - "(%d) %s: built-in vhost net backend is disabled.\n", - dev->vid, __func__); - return 0; + "Failed to allocate memory for mbuf.\n"); + return NULL; } - if (unlikely(!is_valid_virt_queue_idx(queue_id, 1, dev->nr_vring))) { - RTE_LOG(ERR, VHOST_DATA, "(%d) %s: invalid virtqueue idx %d.\n", - dev->vid, __func__, queue_id); - return 0; - } + if (rte_pktmbuf_tailroom(pkt) >= data_len) + return pkt; - vq = dev->virtqueue[queue_id]; + /* attach an external buffer if supported */ + if (dev->extbuf && !virtio_dev_extbuf_alloc(pkt, data_len)) + return pkt; - if (unlikely(rte_spinlock_trylock(&vq->access_lock) == 0)) - return 0; + /* check if chained buffers are allowed */ + if (!dev->linearbuf) + return pkt; - if (unlikely(vq->enabled == 0)) - goto out_access_unlock; - - vq->batch_copy_nb_elems = 0; + /* Data doesn't fit into the buffer and the host supports + * only linear buffers + */ + rte_pktmbuf_free(pkt); - if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)) - vhost_user_iotlb_rd_lock(vq); + return NULL; +} - if (unlikely(vq->access_ok == 0)) - if (unlikely(vring_translate(dev, vq) < 0)) - goto out; +static __rte_noinline uint16_t +virtio_dev_tx_split(struct virtio_net *dev, struct vhost_virtqueue *vq, + struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count) +{ + uint16_t i; + uint16_t free_entries; if (unlikely(dev->dequeue_zero_copy)) { struct zcopy_mbuf *zmbuf, *next; - int nr_updated = 0; for (zmbuf = TAILQ_FIRST(&vq->zmbuf_list); zmbuf != NULL; zmbuf = next) { next = TAILQ_NEXT(zmbuf, next); if (mbuf_is_consumed(zmbuf->mbuf)) { - update_shadow_used_ring(vq, zmbuf->desc_idx, 0); - nr_updated += 1; - + update_shadow_used_ring_split(vq, + zmbuf->desc_idx, 0); TAILQ_REMOVE(&vq->zmbuf_list, zmbuf, next); restore_mbuf(zmbuf->mbuf); rte_pktmbuf_free(zmbuf->mbuf); @@ -1083,45 +1707,24 @@ rte_vhost_dequeue_burst(int vid, uint16_t queue_id, } } - flush_shadow_used_ring(dev, vq); - vhost_vring_call(dev, vq); - } - - rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]); - - /* - * 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. - * - * broadcast_rarp shares a cacheline in the virtio_net structure - * with some fields that are accessed during enqueue and - * rte_atomic16_cmpset() causes a write if using cmpxchg. This could - * result in false sharing between enqueue and dequeue. - * - * Prevent unnecessary false sharing by reading broadcast_rarp first - * and only performing cmpset if the read indicates it is likely to - * be set. - */ - - if (unlikely(rte_atomic16_read(&dev->broadcast_rarp) && - rte_atomic16_cmpset((volatile uint16_t *) - &dev->broadcast_rarp.cnt, 1, 0))) { - - rarp_mbuf = rte_net_make_rarp_packet(mbuf_pool, &dev->mac); - if (rarp_mbuf == NULL) { - RTE_LOG(ERR, VHOST_DATA, - "Failed to make RARP packet.\n"); - return 0; + if (likely(vq->shadow_used_idx)) { + flush_shadow_used_ring_split(dev, vq); + vhost_vring_call_split(dev, vq); } - count -= 1; } free_entries = *((volatile uint16_t *)&vq->avail->idx) - vq->last_avail_idx; if (free_entries == 0) - goto out; + return 0; + + /* + * The ordering between avail index and + * desc reads needs to be enforced. + */ + rte_smp_rmb(); + + rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]); VHOST_LOG_DEBUG(VHOST_DATA, "(%d) %s\n", dev->vid, __func__); @@ -1132,28 +1735,24 @@ rte_vhost_dequeue_burst(int vid, uint16_t queue_id, for (i = 0; i < count; i++) { struct buf_vector buf_vec[BUF_VECTOR_MAX]; - uint16_t head_idx, dummy_len; - uint32_t nr_vec = 0; + uint16_t head_idx; + uint32_t buf_len; + uint16_t nr_vec = 0; int err; - if (unlikely(fill_vec_buf(dev, vq, + if (unlikely(fill_vec_buf_split(dev, vq, vq->last_avail_idx + i, &nr_vec, buf_vec, - &head_idx, &dummy_len, + &head_idx, &buf_len, VHOST_ACCESS_RO) < 0)) break; if (likely(dev->dequeue_zero_copy == 0)) - update_shadow_used_ring(vq, head_idx, 0); + update_shadow_used_ring_split(vq, head_idx, 0); - rte_prefetch0((void *)(uintptr_t)buf_vec[0].buf_addr); - - pkts[i] = rte_pktmbuf_alloc(mbuf_pool); - if (unlikely(pkts[i] == NULL)) { - RTE_LOG(ERR, VHOST_DATA, - "Failed to allocate memory for mbuf.\n"); + pkts[i] = virtio_dev_pktmbuf_alloc(dev, mbuf_pool, buf_len); + if (unlikely(pkts[i] == NULL)) break; - } err = copy_desc_to_mbuf(dev, vq, buf_vec, nr_vec, pkts[i], mbuf_pool); @@ -1191,10 +1790,470 @@ rte_vhost_dequeue_burst(int vid, uint16_t queue_id, do_data_copy_dequeue(vq); if (unlikely(i < count)) vq->shadow_used_idx = i; - flush_shadow_used_ring(dev, vq); - vhost_vring_call(dev, vq); + if (likely(vq->shadow_used_idx)) { + flush_shadow_used_ring_split(dev, vq); + vhost_vring_call_split(dev, vq); + } + } + + return i; +} + +static __rte_always_inline int +vhost_reserve_avail_batch_packed(struct virtio_net *dev, + struct vhost_virtqueue *vq, + struct rte_mempool *mbuf_pool, + struct rte_mbuf **pkts, + uint16_t avail_idx, + uintptr_t *desc_addrs, + uint16_t *ids) +{ + bool wrap = vq->avail_wrap_counter; + struct vring_packed_desc *descs = vq->desc_packed; + struct virtio_net_hdr *hdr; + uint64_t lens[PACKED_BATCH_SIZE]; + uint64_t buf_lens[PACKED_BATCH_SIZE]; + uint32_t buf_offset = dev->vhost_hlen; + uint16_t flags, i; + + if (unlikely(avail_idx & PACKED_BATCH_MASK)) + return -1; + if (unlikely((avail_idx + PACKED_BATCH_SIZE) > vq->size)) + return -1; + + vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) { + flags = descs[avail_idx + i].flags; + if (unlikely((wrap != !!(flags & VRING_DESC_F_AVAIL)) || + (wrap == !!(flags & VRING_DESC_F_USED)) || + (flags & PACKED_DESC_SINGLE_DEQUEUE_FLAG))) + return -1; + } + + rte_smp_rmb(); + + vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) + lens[i] = descs[avail_idx + i].len; + + vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) { + desc_addrs[i] = vhost_iova_to_vva(dev, vq, + descs[avail_idx + i].addr, + &lens[i], VHOST_ACCESS_RW); + } + + vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) { + if (unlikely((lens[i] != descs[avail_idx + i].len))) + return -1; + } + + vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) { + pkts[i] = virtio_dev_pktmbuf_alloc(dev, mbuf_pool, lens[i]); + if (!pkts[i]) + goto free_buf; } + vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) + buf_lens[i] = pkts[i]->buf_len - pkts[i]->data_off; + + vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) { + if (unlikely(buf_lens[i] < (lens[i] - buf_offset))) + goto free_buf; + } + + vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) { + pkts[i]->pkt_len = descs[avail_idx + i].len - buf_offset; + pkts[i]->data_len = pkts[i]->pkt_len; + ids[i] = descs[avail_idx + i].id; + } + + if (virtio_net_with_host_offload(dev)) { + vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) { + hdr = (struct virtio_net_hdr *)(desc_addrs[i]); + vhost_dequeue_offload(hdr, pkts[i]); + } + } + + return 0; + +free_buf: + for (i = 0; i < PACKED_BATCH_SIZE; i++) + rte_pktmbuf_free(pkts[i]); + + return -1; +} + +static __rte_always_inline int +virtio_dev_tx_batch_packed(struct virtio_net *dev, + struct vhost_virtqueue *vq, + struct rte_mempool *mbuf_pool, + struct rte_mbuf **pkts) +{ + uint16_t avail_idx = vq->last_avail_idx; + uint32_t buf_offset = dev->vhost_hlen; + uintptr_t desc_addrs[PACKED_BATCH_SIZE]; + uint16_t ids[PACKED_BATCH_SIZE]; + uint16_t i; + + if (vhost_reserve_avail_batch_packed(dev, vq, mbuf_pool, pkts, + avail_idx, desc_addrs, ids)) + return -1; + + vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) + rte_prefetch0((void *)(uintptr_t)desc_addrs[i]); + + vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) + rte_memcpy(rte_pktmbuf_mtod_offset(pkts[i], void *, 0), + (void *)(uintptr_t)(desc_addrs[i] + buf_offset), + pkts[i]->pkt_len); + + if (virtio_net_is_inorder(dev)) + vhost_shadow_dequeue_batch_packed_inorder(vq, + ids[PACKED_BATCH_SIZE - 1]); + else + vhost_shadow_dequeue_batch_packed(dev, vq, ids); + + vq_inc_last_avail_packed(vq, PACKED_BATCH_SIZE); + + return 0; +} + +static __rte_always_inline int +vhost_dequeue_single_packed(struct virtio_net *dev, + struct vhost_virtqueue *vq, + struct rte_mempool *mbuf_pool, + struct rte_mbuf **pkts, + uint16_t *buf_id, + uint16_t *desc_count) +{ + struct buf_vector buf_vec[BUF_VECTOR_MAX]; + uint32_t buf_len; + uint16_t nr_vec = 0; + int err; + + if (unlikely(fill_vec_buf_packed(dev, vq, + vq->last_avail_idx, desc_count, + buf_vec, &nr_vec, + buf_id, &buf_len, + VHOST_ACCESS_RO) < 0)) + return -1; + + *pkts = virtio_dev_pktmbuf_alloc(dev, mbuf_pool, buf_len); + if (unlikely(*pkts == NULL)) { + RTE_LOG(ERR, VHOST_DATA, + "Failed to allocate memory for mbuf.\n"); + return -1; + } + + err = copy_desc_to_mbuf(dev, vq, buf_vec, nr_vec, *pkts, + mbuf_pool); + if (unlikely(err)) { + rte_pktmbuf_free(*pkts); + return -1; + } + + return 0; +} + +static __rte_always_inline int +virtio_dev_tx_single_packed(struct virtio_net *dev, + struct vhost_virtqueue *vq, + struct rte_mempool *mbuf_pool, + struct rte_mbuf **pkts) +{ + + uint16_t buf_id, desc_count; + + if (vhost_dequeue_single_packed(dev, vq, mbuf_pool, pkts, &buf_id, + &desc_count)) + return -1; + + if (virtio_net_is_inorder(dev)) + vhost_shadow_dequeue_single_packed_inorder(vq, buf_id, + desc_count); + else + vhost_shadow_dequeue_single_packed(vq, buf_id, desc_count); + + vq_inc_last_avail_packed(vq, desc_count); + + return 0; +} + +static __rte_always_inline int +virtio_dev_tx_batch_packed_zmbuf(struct virtio_net *dev, + struct vhost_virtqueue *vq, + struct rte_mempool *mbuf_pool, + struct rte_mbuf **pkts) +{ + struct zcopy_mbuf *zmbufs[PACKED_BATCH_SIZE]; + uintptr_t desc_addrs[PACKED_BATCH_SIZE]; + uint16_t ids[PACKED_BATCH_SIZE]; + uint16_t i; + + uint16_t avail_idx = vq->last_avail_idx; + + if (vhost_reserve_avail_batch_packed(dev, vq, mbuf_pool, pkts, + avail_idx, desc_addrs, ids)) + return -1; + + vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) + zmbufs[i] = get_zmbuf(vq); + + vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) { + if (!zmbufs[i]) + goto free_pkt; + } + + vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) { + zmbufs[i]->mbuf = pkts[i]; + zmbufs[i]->desc_idx = avail_idx + i; + zmbufs[i]->desc_count = 1; + } + + vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) + rte_mbuf_refcnt_update(pkts[i], 1); + + vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) + TAILQ_INSERT_TAIL(&vq->zmbuf_list, zmbufs[i], next); + + vq->nr_zmbuf += PACKED_BATCH_SIZE; + vq_inc_last_avail_packed(vq, PACKED_BATCH_SIZE); + + return 0; + +free_pkt: + vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) + rte_pktmbuf_free(pkts[i]); + + return -1; +} + +static __rte_always_inline int +virtio_dev_tx_single_packed_zmbuf(struct virtio_net *dev, + struct vhost_virtqueue *vq, + struct rte_mempool *mbuf_pool, + struct rte_mbuf **pkts) +{ + uint16_t buf_id, desc_count; + struct zcopy_mbuf *zmbuf; + + if (vhost_dequeue_single_packed(dev, vq, mbuf_pool, pkts, &buf_id, + &desc_count)) + return -1; + + zmbuf = get_zmbuf(vq); + if (!zmbuf) { + rte_pktmbuf_free(*pkts); + return -1; + } + zmbuf->mbuf = *pkts; + zmbuf->desc_idx = vq->last_avail_idx; + zmbuf->desc_count = desc_count; + + rte_mbuf_refcnt_update(*pkts, 1); + + vq->nr_zmbuf += 1; + TAILQ_INSERT_TAIL(&vq->zmbuf_list, zmbuf, next); + + vq_inc_last_avail_packed(vq, desc_count); + return 0; +} + +static __rte_always_inline void +free_zmbuf(struct vhost_virtqueue *vq) +{ + struct zcopy_mbuf *next = NULL; + struct zcopy_mbuf *zmbuf; + + for (zmbuf = TAILQ_FIRST(&vq->zmbuf_list); + zmbuf != NULL; zmbuf = next) { + next = TAILQ_NEXT(zmbuf, next); + + uint16_t last_used_idx = vq->last_used_idx; + + if (mbuf_is_consumed(zmbuf->mbuf)) { + uint16_t flags; + flags = vq->desc_packed[last_used_idx].flags; + if (vq->used_wrap_counter) { + flags |= VRING_DESC_F_USED; + flags |= VRING_DESC_F_AVAIL; + } else { + flags &= ~VRING_DESC_F_USED; + flags &= ~VRING_DESC_F_AVAIL; + } + + vq->desc_packed[last_used_idx].id = zmbuf->desc_idx; + vq->desc_packed[last_used_idx].len = 0; + + rte_smp_wmb(); + vq->desc_packed[last_used_idx].flags = flags; + + vq_inc_last_used_packed(vq, zmbuf->desc_count); + + TAILQ_REMOVE(&vq->zmbuf_list, zmbuf, next); + restore_mbuf(zmbuf->mbuf); + rte_pktmbuf_free(zmbuf->mbuf); + put_zmbuf(zmbuf); + vq->nr_zmbuf -= 1; + } + } +} + +static __rte_noinline uint16_t +virtio_dev_tx_packed_zmbuf(struct virtio_net *dev, + struct vhost_virtqueue *vq, + struct rte_mempool *mbuf_pool, + struct rte_mbuf **pkts, + uint32_t count) +{ + uint32_t pkt_idx = 0; + uint32_t remained = count; + + free_zmbuf(vq); + + do { + if (remained >= PACKED_BATCH_SIZE) { + if (!virtio_dev_tx_batch_packed_zmbuf(dev, vq, + mbuf_pool, &pkts[pkt_idx])) { + pkt_idx += PACKED_BATCH_SIZE; + remained -= PACKED_BATCH_SIZE; + continue; + } + } + + if (virtio_dev_tx_single_packed_zmbuf(dev, vq, mbuf_pool, + &pkts[pkt_idx])) + break; + pkt_idx++; + remained--; + + } while (remained); + + if (pkt_idx) + vhost_vring_call_packed(dev, vq); + + return pkt_idx; +} + +static __rte_noinline uint16_t +virtio_dev_tx_packed(struct virtio_net *dev, + struct vhost_virtqueue *vq, + struct rte_mempool *mbuf_pool, + struct rte_mbuf **pkts, + uint32_t count) +{ + uint32_t pkt_idx = 0; + uint32_t remained = count; + + do { + rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]); + + if (remained >= PACKED_BATCH_SIZE) { + if (!virtio_dev_tx_batch_packed(dev, vq, mbuf_pool, + &pkts[pkt_idx])) { + vhost_flush_dequeue_packed(dev, vq); + pkt_idx += PACKED_BATCH_SIZE; + remained -= PACKED_BATCH_SIZE; + continue; + } + } + + if (virtio_dev_tx_single_packed(dev, vq, mbuf_pool, + &pkts[pkt_idx])) + break; + vhost_flush_dequeue_packed(dev, vq); + pkt_idx++; + remained--; + + } while (remained); + + if (vq->shadow_used_idx) + do_data_copy_dequeue(vq); + + return pkt_idx; +} + +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; + + dev = get_device(vid); + if (!dev) + return 0; + + if (unlikely(!(dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET))) { + RTE_LOG(ERR, VHOST_DATA, + "(%d) %s: built-in vhost net backend is disabled.\n", + dev->vid, __func__); + return 0; + } + + if (unlikely(!is_valid_virt_queue_idx(queue_id, 1, dev->nr_vring))) { + 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(rte_spinlock_trylock(&vq->access_lock) == 0)) + return 0; + + if (unlikely(vq->enabled == 0)) { + count = 0; + goto out_access_unlock; + } + + if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)) + vhost_user_iotlb_rd_lock(vq); + + if (unlikely(vq->access_ok == 0)) + if (unlikely(vring_translate(dev, vq) < 0)) { + count = 0; + goto out; + } + + /* + * 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. + * + * broadcast_rarp shares a cacheline in the virtio_net structure + * with some fields that are accessed during enqueue and + * rte_atomic16_cmpset() causes a write if using cmpxchg. This could + * result in false sharing between enqueue and dequeue. + * + * Prevent unnecessary false sharing by reading broadcast_rarp first + * and only performing cmpset if the read indicates it is likely to + * be set. + */ + if (unlikely(rte_atomic16_read(&dev->broadcast_rarp) && + rte_atomic16_cmpset((volatile uint16_t *) + &dev->broadcast_rarp.cnt, 1, 0))) { + + rarp_mbuf = rte_net_make_rarp_packet(mbuf_pool, &dev->mac); + if (rarp_mbuf == NULL) { + RTE_LOG(ERR, VHOST_DATA, + "Failed to make RARP packet.\n"); + count = 0; + goto out; + } + count -= 1; + } + + if (vq_is_packed(dev)) { + if (unlikely(dev->dequeue_zero_copy)) + count = virtio_dev_tx_packed_zmbuf(dev, vq, mbuf_pool, + pkts, count); + else + count = virtio_dev_tx_packed(dev, vq, mbuf_pool, pkts, + count); + } else + count = virtio_dev_tx_split(dev, vq, mbuf_pool, pkts, count); + out: if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)) vhost_user_iotlb_rd_unlock(vq); @@ -1207,10 +2266,10 @@ out_access_unlock: * 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 *)); + memmove(&pkts[1], pkts, count * sizeof(struct rte_mbuf *)); pkts[0] = rarp_mbuf; - i += 1; + count += 1; } - return i; + return count; }