X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=lib%2Flibrte_vhost%2Fvirtio_net.c;h=cfd69ceac117dad92d7f87800709bec7b8847316;hb=8e6d9d118f6105a3627b64a7949e1fb0b145879e;hp=337470d64ad3875722e3934a940c217890e20dea;hpb=ce3d555e43e3795b5d9507fcfc76b7a0a92fd0d6;p=deb_dpdk.git diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c index 337470d6..cfd69cea 100644 --- a/lib/librte_vhost/virtio_net.c +++ b/lib/librte_vhost/virtio_net.c @@ -44,16 +44,27 @@ #include #include #include +#include +#include #include "vhost.h" #define MAX_PKT_BURST 32 #define VHOST_LOG_PAGE 4096 +/* + * Atomically set a bit in memory. + */ +static inline void __attribute__((always_inline)) +vhost_set_bit(unsigned int nr, volatile uint8_t *addr) +{ + __sync_fetch_and_or_1(addr, (1U << nr)); +} + static inline void __attribute__((always_inline)) vhost_log_page(uint8_t *log_base, uint64_t page) { - log_base[page / 8] |= 1 << (page % 8); + vhost_set_bit(page % 8, &log_base[page / 8]); } static inline void __attribute__((always_inline)) @@ -78,6 +89,94 @@ vhost_log_write(struct virtio_net *dev, uint64_t addr, uint64_t len) } } +static inline void __attribute__((always_inline)) +vhost_log_cache_sync(struct virtio_net *dev, struct vhost_virtqueue *vq) +{ + unsigned long *log_base; + int i; + + if (likely(((dev->features & (1ULL << VHOST_F_LOG_ALL)) == 0) || + !dev->log_base)) + return; + + log_base = (unsigned long *)(uintptr_t)dev->log_base; + + /* + * It is expected a write memory barrier has been issued + * before this function is called. + */ + + for (i = 0; i < vq->log_cache_nb_elem; i++) { + struct log_cache_entry *elem = vq->log_cache + i; + + __sync_fetch_and_or(log_base + elem->offset, elem->val); + } + + rte_smp_wmb(); + + vq->log_cache_nb_elem = 0; +} + +static inline void __attribute__((always_inline)) +vhost_log_cache_page(struct virtio_net *dev, struct vhost_virtqueue *vq, + uint64_t page) +{ + uint32_t bit_nr = page % (sizeof(unsigned long) << 3); + uint32_t offset = page / (sizeof(unsigned long) << 3); + int i; + + for (i = 0; i < vq->log_cache_nb_elem; i++) { + struct log_cache_entry *elem = vq->log_cache + i; + + if (elem->offset == offset) { + elem->val |= (1UL << bit_nr); + return; + } + } + + if (unlikely(i >= VHOST_LOG_CACHE_NR)) { + /* + * No more room for a new log cache entry, + * so write the dirty log map directly. + */ + rte_smp_wmb(); + vhost_log_page((uint8_t *)(uintptr_t)dev->log_base, page); + + return; + } + + vq->log_cache[i].offset = offset; + vq->log_cache[i].val = (1UL << bit_nr); + vq->log_cache_nb_elem++; +} + +static inline void __attribute__((always_inline)) +vhost_log_cache_write(struct virtio_net *dev, struct vhost_virtqueue *vq, + uint64_t addr, uint64_t len) +{ + uint64_t page; + + if (likely(((dev->features & (1ULL << VHOST_F_LOG_ALL)) == 0) || + !dev->log_base || !len)) + return; + + if (unlikely(dev->log_size <= ((addr + len - 1) / VHOST_LOG_PAGE / 8))) + return; + + page = addr / VHOST_LOG_PAGE; + while (page * VHOST_LOG_PAGE < addr + len) { + vhost_log_cache_page(dev, vq, page); + page += 1; + } +} + +static inline void __attribute__((always_inline)) +vhost_log_cache_used_vring(struct virtio_net *dev, struct vhost_virtqueue *vq, + uint64_t offset, uint64_t len) +{ + vhost_log_cache_write(dev, vq, vq->log_guest_addr + offset, len); +} + static inline void __attribute__((always_inline)) vhost_log_used_vring(struct virtio_net *dev, struct vhost_virtqueue *vq, uint64_t offset, uint64_t len) @@ -91,6 +190,44 @@ 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; } +static inline struct vring_desc *__attribute__((always_inline)) +alloc_copy_ind_table(struct virtio_net *dev, struct vring_desc *desc) +{ + struct vring_desc *idesc; + uint64_t src, dst; + uint64_t len, remain = desc->len; + uint64_t desc_addr = desc->addr; + + idesc = rte_malloc(__func__, desc->len, 0); + if (unlikely(!idesc)) + return 0; + + dst = (uint64_t)(uintptr_t)idesc; + + while (remain) { + len = remain; + src = gpa_to_vva(dev, desc_addr, &len); + 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; +} + +static inline void __attribute__((always_inline)) +free_ind_table(struct vring_desc *idesc) +{ + rte_free(idesc); +} + static inline void __attribute__((always_inline)) do_flush_shadow_used_ring(struct virtio_net *dev, struct vhost_virtqueue *vq, uint16_t to, uint16_t from, uint16_t size) @@ -98,7 +235,7 @@ do_flush_shadow_used_ring(struct virtio_net *dev, struct vhost_virtqueue *vq, rte_memcpy(&vq->used->ring[to], &vq->shadow_used_ring[from], size * sizeof(struct vring_used_elem)); - vhost_log_used_vring(dev, vq, + vhost_log_cache_used_vring(dev, vq, offsetof(struct vring_used, ring[to]), size * sizeof(struct vring_used_elem)); } @@ -126,6 +263,8 @@ flush_shadow_used_ring(struct virtio_net *dev, struct vhost_virtqueue *vq) rte_smp_wmb(); + vhost_log_cache_sync(dev, vq); + *(volatile uint16_t *)&vq->used->idx += vq->shadow_used_idx; vhost_log_used_vring(dev, vq, offsetof(struct vring_used, idx), sizeof(vq->used->idx)); @@ -144,11 +283,16 @@ update_shadow_used_ring(struct vhost_virtqueue *vq, 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) { + uint64_t csum_l4 = m_buf->ol_flags & PKT_TX_L4_MASK; + + if (m_buf->ol_flags & PKT_TX_TCP_SEG) + csum_l4 |= PKT_TX_TCP_CKSUM; + + if (csum_l4) { 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) { + switch (csum_l4) { case PKT_TX_TCP_CKSUM: net_hdr->csum_offset = (offsetof(struct tcp_hdr, cksum)); @@ -164,6 +308,15 @@ 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; + + ipv4_hdr = rte_pktmbuf_mtod_offset(m_buf, struct ipv4_hdr *, + m_buf->l2_len); + ipv4_hdr->hdr_checksum = rte_ipv4_cksum(ipv4_hdr); + } + 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; @@ -186,20 +339,24 @@ copy_virtio_net_hdr(struct virtio_net *dev, uint64_t desc_addr, } static inline int __attribute__((always_inline)) -copy_mbuf_to_desc(struct virtio_net *dev, struct vring_desc *descs, - struct rte_mbuf *m, uint16_t desc_idx, uint32_t size) +copy_mbuf_to_desc(struct virtio_net *dev, struct vhost_virtqueue *vq, + struct vring_desc *descs, struct rte_mbuf *m, + uint16_t desc_idx, uint32_t size) { uint32_t desc_avail, desc_offset; uint32_t mbuf_avail, mbuf_offset; uint32_t cpy_len; + uint64_t desc_chunck_len; struct vring_desc *desc; - uint64_t desc_addr; + uint64_t desc_addr, desc_gaddr; struct virtio_net_hdr_mrg_rxbuf virtio_hdr = {{0, 0, 0, 0, 0, 0}, 0}; /* A counter to avoid desc dead loop chain */ uint16_t nr_desc = 1; desc = &descs[desc_idx]; - desc_addr = gpa_to_vva(dev, desc->addr); + desc_chunck_len = desc->len; + desc_gaddr = desc->addr; + desc_addr = gpa_to_vva(dev, desc_gaddr, &desc_chunck_len); /* * 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 @@ -211,12 +368,51 @@ copy_mbuf_to_desc(struct virtio_net *dev, struct vring_desc *descs, rte_prefetch0((void *)(uintptr_t)desc_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 (likely(desc_chunck_len >= dev->vhost_hlen)) { + copy_virtio_net_hdr(dev, desc_addr, virtio_hdr); + + virtio_enqueue_offload(m, + (struct virtio_net_hdr *)(uintptr_t)desc_addr); + PRINT_PACKET(dev, (uintptr_t)desc_addr, dev->vhost_hlen, 0); + } else { + uint64_t remain = dev->vhost_hlen; + uint64_t len; + uint64_t src = (uint64_t)(uintptr_t)&virtio_hdr, dst; + uint64_t guest_addr = desc_gaddr; + + while (remain) { + len = remain; + dst = gpa_to_vva(dev, guest_addr, &len); + if (unlikely(!dst || !len)) + return -1; + + rte_memcpy((void *)(uintptr_t)dst, + (void *)(uintptr_t)src, len); + + PRINT_PACKET(dev, (uintptr_t)dst, (uint32_t)len, 0); + remain -= len; + guest_addr += len; + dst += len; + } + } + + vhost_log_cache_write(dev, vq, desc_gaddr, dev->vhost_hlen); - desc_offset = dev->vhost_hlen; desc_avail = desc->len - dev->vhost_hlen; + if (unlikely(desc_chunck_len < dev->vhost_hlen)) { + desc_chunck_len = desc_avail; + desc_gaddr += dev->vhost_hlen; + desc_addr = gpa_to_vva(dev, + desc_gaddr, + &desc_chunck_len); + if (unlikely(!desc_addr)) + return -1; + + desc_offset = 0; + } else { + desc_offset = dev->vhost_hlen; + desc_chunck_len -= dev->vhost_hlen; + } mbuf_avail = rte_pktmbuf_data_len(m); mbuf_offset = 0; @@ -239,19 +435,32 @@ copy_mbuf_to_desc(struct virtio_net *dev, struct vring_desc *descs, return -1; desc = &descs[desc->next]; - desc_addr = gpa_to_vva(dev, desc->addr); + desc_chunck_len = desc->len; + desc_gaddr = desc->addr; + desc_addr = gpa_to_vva(dev, + desc_gaddr, &desc_chunck_len); if (unlikely(!desc_addr)) return -1; desc_offset = 0; desc_avail = desc->len; + } else if (unlikely(desc_chunck_len == 0)) { + desc_chunck_len = desc_avail; + desc_gaddr += desc_offset; + desc_addr = gpa_to_vva(dev, + desc_gaddr, &desc_chunck_len); + if (unlikely(!desc_addr)) + return -1; + + desc_offset = 0; } 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); + vhost_log_cache_write(dev, vq, desc_gaddr + desc_offset, + cpy_len); PRINT_PACKET(dev, (uintptr_t)(desc_addr + desc_offset), cpy_len, 0); @@ -259,6 +468,7 @@ copy_mbuf_to_desc(struct virtio_net *dev, struct vring_desc *descs, mbuf_offset += cpy_len; desc_avail -= cpy_len; desc_offset += cpy_len; + desc_chunck_len -= cpy_len; } return 0; @@ -281,8 +491,9 @@ virtio_dev_rx(struct virtio_net *dev, uint16_t queue_id, struct vring_desc *descs; uint16_t used_idx; uint32_t i, sz; + uint64_t dlen; - LOG_DEBUG(VHOST_DATA, "(%d) %s\n", dev->vid, __func__); + VHOST_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); @@ -290,8 +501,11 @@ virtio_dev_rx(struct virtio_net *dev, uint16_t queue_id, } vq = dev->virtqueue[queue_id]; + + rte_spinlock_lock(&vq->access_lock); + if (unlikely(vq->enabled == 0)) - return 0; + goto out_access_unlock; avail_idx = *((volatile uint16_t *)&vq->avail->idx); start_idx = vq->last_used_idx; @@ -299,9 +513,9 @@ virtio_dev_rx(struct virtio_net *dev, uint16_t queue_id, count = RTE_MIN(count, free_entries); count = RTE_MIN(count, (uint32_t)MAX_PKT_BURST); if (count == 0) - return 0; + goto out_access_unlock; - LOG_DEBUG(VHOST_DATA, "(%d) start_idx %d | end_idx %d\n", + VHOST_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. */ @@ -312,24 +526,39 @@ virtio_dev_rx(struct virtio_net *dev, uint16_t queue_id, 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, + vhost_log_cache_used_vring(dev, vq, offsetof(struct vring_used, ring[used_idx]), sizeof(vq->used->ring[used_idx])); } rte_prefetch0(&vq->desc[desc_indexes[0]]); for (i = 0; i < count; i++) { + struct vring_desc *idesc = NULL; uint16_t desc_idx = desc_indexes[i]; int err; if (vq->desc[desc_idx].flags & VRING_DESC_F_INDIRECT) { + dlen = vq->desc[desc_idx].len; descs = (struct vring_desc *)(uintptr_t)gpa_to_vva(dev, - vq->desc[desc_idx].addr); + vq->desc[desc_idx].addr, &dlen); if (unlikely(!descs)) { count = i; break; } + if (unlikely(dlen < vq->desc[desc_idx].len)) { + /* + * The indirect desc table is not contiguous + * in process VA space, we have to copy it. + */ + idesc = alloc_copy_ind_table(dev, + &vq->desc[desc_idx]); + if (unlikely(!idesc)) + break; + + descs = idesc; + } + desc_idx = 0; sz = vq->desc[desc_idx].len / sizeof(*descs); } else { @@ -337,21 +566,26 @@ virtio_dev_rx(struct virtio_net *dev, uint16_t queue_id, sz = vq->size; } - err = copy_mbuf_to_desc(dev, descs, pkts[i], desc_idx, sz); + err = copy_mbuf_to_desc(dev, vq, descs, pkts[i], desc_idx, sz); 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, + vhost_log_cache_used_vring(dev, vq, offsetof(struct vring_used, ring[used_idx]), sizeof(vq->used->ring[used_idx])); } if (i + 1 < count) rte_prefetch0(&vq->desc[desc_indexes[i+1]]); + + if (unlikely(!!idesc)) + free_ind_table(idesc); } rte_smp_wmb(); + vhost_log_cache_sync(dev, vq); + *(volatile uint16_t *)&vq->used->idx += count; vq->last_used_idx += count; vhost_log_used_vring(dev, vq, @@ -365,6 +599,10 @@ virtio_dev_rx(struct virtio_net *dev, uint16_t queue_id, if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT) && (vq->callfd >= 0)) eventfd_write(vq->callfd, (eventfd_t)1); + +out_access_unlock: + rte_spinlock_unlock(&vq->access_lock); + return count; } @@ -377,22 +615,40 @@ fill_vec_buf(struct virtio_net *dev, struct vhost_virtqueue *vq, uint16_t idx = vq->avail->ring[avail_idx & (vq->size - 1)]; uint32_t vec_id = *vec_idx; uint32_t len = 0; + uint64_t dlen; struct vring_desc *descs = vq->desc; + struct vring_desc *idesc = NULL; *desc_chain_head = idx; if (vq->desc[idx].flags & VRING_DESC_F_INDIRECT) { + dlen = vq->desc[idx].len; descs = (struct vring_desc *)(uintptr_t) - gpa_to_vva(dev, vq->desc[idx].addr); + gpa_to_vva(dev, vq->desc[idx].addr, + &dlen); if (unlikely(!descs)) return -1; + if (unlikely(dlen < vq->desc[idx].len)) { + /* + * The indirect desc table is not contiguous + * in process VA space, we have to copy it. + */ + idesc = alloc_copy_ind_table(dev, &vq->desc[idx]); + if (unlikely(!idesc)) + return -1; + + descs = idesc; + } + idx = 0; } while (1) { - if (unlikely(vec_id >= BUF_VECTOR_MAX || idx >= vq->size)) + if (unlikely(vec_id >= BUF_VECTOR_MAX || idx >= vq->size)) { + free_ind_table(idesc); return -1; + } len += descs[idx].len; buf_vec[vec_id].buf_addr = descs[idx].addr; @@ -409,6 +665,9 @@ fill_vec_buf(struct virtio_net *dev, struct vhost_virtqueue *vq, *desc_chain_len = len; *vec_idx = vec_id; + if (unlikely(!!idesc)) + free_ind_table(idesc); + return 0; } @@ -458,12 +717,15 @@ reserve_avail_buf_mergeable(struct virtio_net *dev, struct vhost_virtqueue *vq, } static inline int __attribute__((always_inline)) -copy_mbuf_to_desc_mergeable(struct virtio_net *dev, struct rte_mbuf *m, - struct buf_vector *buf_vec, uint16_t num_buffers) +copy_mbuf_to_desc_mergeable(struct virtio_net *dev, + struct vhost_virtqueue *vq, struct rte_mbuf *m, + struct buf_vector *buf_vec, uint16_t num_buffers) { struct virtio_net_hdr_mrg_rxbuf virtio_hdr = {{0, 0, 0, 0, 0, 0}, 0}; + struct virtio_net_hdr_mrg_rxbuf *hdr; uint32_t vec_idx = 0; - uint64_t desc_addr; + uint64_t desc_addr, desc_gaddr; + uint64_t desc_chunck_len; uint32_t mbuf_offset, mbuf_avail; uint32_t desc_offset, desc_avail; uint32_t cpy_len; @@ -473,21 +735,42 @@ copy_mbuf_to_desc_mergeable(struct virtio_net *dev, struct rte_mbuf *m, if (unlikely(m == NULL)) return -1; - desc_addr = gpa_to_vva(dev, buf_vec[vec_idx].buf_addr); - if (buf_vec[vec_idx].buf_len < dev->vhost_hlen || !desc_addr) + desc_chunck_len = buf_vec[vec_idx].buf_len; + desc_gaddr = buf_vec[vec_idx].buf_addr; + desc_addr = gpa_to_vva(dev, desc_gaddr, &desc_chunck_len); + if (buf_vec[vec_idx].buf_len < dev->vhost_hlen || + !desc_addr) return -1; hdr_mbuf = m; hdr_addr = desc_addr; + if (unlikely(desc_chunck_len < dev->vhost_hlen)) + hdr = &virtio_hdr; + else + hdr = (struct virtio_net_hdr_mrg_rxbuf *)(uintptr_t)hdr_addr; hdr_phys_addr = buf_vec[vec_idx].buf_addr; rte_prefetch0((void *)(uintptr_t)hdr_addr); virtio_hdr.num_buffers = num_buffers; - LOG_DEBUG(VHOST_DATA, "(%d) RX: num merge buffers %d\n", + VHOST_LOG_DEBUG(VHOST_DATA, "(%d) RX: num merge buffers %d\n", dev->vid, num_buffers); desc_avail = buf_vec[vec_idx].buf_len - dev->vhost_hlen; - desc_offset = dev->vhost_hlen; + if (unlikely(desc_chunck_len < dev->vhost_hlen)) { + desc_chunck_len = desc_avail; + desc_gaddr += dev->vhost_hlen; + desc_addr = gpa_to_vva(dev, + desc_gaddr, + &desc_chunck_len); + if (unlikely(!desc_addr)) + return -1; + + desc_offset = 0; + } else { + desc_offset = dev->vhost_hlen; + desc_chunck_len -= dev->vhost_hlen; + } + mbuf_avail = rte_pktmbuf_data_len(m); mbuf_offset = 0; @@ -495,7 +778,10 @@ copy_mbuf_to_desc_mergeable(struct virtio_net *dev, struct rte_mbuf *m, /* done with current desc buf, get the next one */ if (desc_avail == 0) { vec_idx++; - desc_addr = gpa_to_vva(dev, buf_vec[vec_idx].buf_addr); + desc_gaddr = buf_vec[vec_idx].buf_addr; + desc_chunck_len = buf_vec[vec_idx].buf_len; + desc_addr = gpa_to_vva(dev, desc_gaddr, + &desc_chunck_len); if (unlikely(!desc_addr)) return -1; @@ -503,6 +789,16 @@ copy_mbuf_to_desc_mergeable(struct virtio_net *dev, struct rte_mbuf *m, rte_prefetch0((void *)(uintptr_t)desc_addr); desc_offset = 0; desc_avail = buf_vec[vec_idx].buf_len; + } else if (unlikely(desc_chunck_len == 0)) { + desc_chunck_len = desc_avail; + desc_gaddr += desc_offset; + desc_addr = gpa_to_vva(dev, + desc_gaddr, + &desc_chunck_len); + if (unlikely(!desc_addr)) + return -1; + + desc_offset = 0; } /* done with current mbuf, get the next one */ @@ -515,20 +811,47 @@ copy_mbuf_to_desc_mergeable(struct virtio_net *dev, struct rte_mbuf *m, if (hdr_addr) { virtio_enqueue_offload(hdr_mbuf, &virtio_hdr.hdr); - copy_virtio_net_hdr(dev, hdr_addr, virtio_hdr); - vhost_log_write(dev, hdr_phys_addr, dev->vhost_hlen); + if (likely(hdr != &virtio_hdr)) { + copy_virtio_net_hdr(dev, hdr_addr, virtio_hdr); + } else { + uint64_t len; + uint64_t remain = dev->vhost_hlen; + uint64_t src = (uint64_t)(uintptr_t)&virtio_hdr; + uint64_t dst; + uint64_t guest_addr = hdr_phys_addr; + + while (remain) { + len = remain; + dst = gpa_to_vva(dev, guest_addr, &len); + if (unlikely(!dst || !len)) + return -1; + + rte_memcpy((void *)(uintptr_t)dst, + (void *)(uintptr_t)src, + len); + + PRINT_PACKET(dev, (uintptr_t)dst, + (uint32_t)len, 0); + + remain -= len; + guest_addr += len; + dst += len; + } + } + vhost_log_cache_write(dev, vq, hdr_phys_addr, + dev->vhost_hlen); PRINT_PACKET(dev, (uintptr_t)hdr_addr, dev->vhost_hlen, 0); hdr_addr = 0; } - cpy_len = RTE_MIN(desc_avail, mbuf_avail); + cpy_len = RTE_MIN(desc_chunck_len, 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); + vhost_log_cache_write(dev, vq, desc_gaddr + desc_offset, + cpy_len); PRINT_PACKET(dev, (uintptr_t)(desc_addr + desc_offset), cpy_len, 0); @@ -536,6 +859,7 @@ copy_mbuf_to_desc_mergeable(struct virtio_net *dev, struct rte_mbuf *m, mbuf_offset += cpy_len; desc_avail -= cpy_len; desc_offset += cpy_len; + desc_chunck_len -= cpy_len; } return 0; @@ -551,7 +875,7 @@ virtio_dev_merge_rx(struct virtio_net *dev, uint16_t queue_id, struct buf_vector buf_vec[BUF_VECTOR_MAX]; uint16_t avail_head; - LOG_DEBUG(VHOST_DATA, "(%d) %s\n", dev->vid, __func__); + VHOST_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); @@ -559,12 +883,15 @@ virtio_dev_merge_rx(struct virtio_net *dev, uint16_t queue_id, } vq = dev->virtqueue[queue_id]; + + rte_spinlock_lock(&vq->access_lock); + if (unlikely(vq->enabled == 0)) - return 0; + goto out_access_unlock; count = RTE_MIN((uint32_t)MAX_PKT_BURST, count); if (count == 0) - return 0; + goto out_access_unlock; rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]); @@ -576,18 +903,18 @@ virtio_dev_merge_rx(struct virtio_net *dev, uint16_t queue_id, if (unlikely(reserve_avail_buf_mergeable(dev, vq, pkt_len, buf_vec, &num_buffers, avail_head) < 0)) { - LOG_DEBUG(VHOST_DATA, + VHOST_LOG_DEBUG(VHOST_DATA, "(%d) failed to get enough desc from vring\n", dev->vid); vq->shadow_used_idx -= num_buffers; break; } - LOG_DEBUG(VHOST_DATA, "(%d) current index %d | end index %d\n", + 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); - if (copy_mbuf_to_desc_mergeable(dev, pkts[pkt_idx], + if (copy_mbuf_to_desc_mergeable(dev, vq, pkts[pkt_idx], buf_vec, num_buffers) < 0) { vq->shadow_used_idx -= num_buffers; break; @@ -608,6 +935,9 @@ virtio_dev_merge_rx(struct virtio_net *dev, uint16_t queue_id, eventfd_write(vq->callfd, (eventfd_t)1); } +out_access_unlock: + rte_spinlock_unlock(&vq->access_lock); + return pkt_idx; } @@ -630,9 +960,11 @@ static inline bool virtio_net_with_host_offload(struct virtio_net *dev) { if (dev->features & - (VIRTIO_NET_F_CSUM | VIRTIO_NET_F_HOST_ECN | - VIRTIO_NET_F_HOST_TSO4 | VIRTIO_NET_F_HOST_TSO6 | - VIRTIO_NET_F_HOST_UFO)) + ((1ULL << VIRTIO_NET_F_CSUM) | + (1ULL << VIRTIO_NET_F_HOST_ECN) | + (1ULL << VIRTIO_NET_F_HOST_TSO4) | + (1ULL << VIRTIO_NET_F_HOST_TSO6) | + (1ULL << VIRTIO_NET_F_HOST_UFO))) return true; return false; @@ -784,11 +1116,13 @@ copy_desc_to_mbuf(struct virtio_net *dev, struct vring_desc *descs, struct rte_mempool *mbuf_pool) { struct vring_desc *desc; - uint64_t desc_addr; + uint64_t desc_addr, desc_gaddr; uint32_t desc_avail, desc_offset; uint32_t mbuf_avail, mbuf_offset; uint32_t cpy_len; + uint64_t desc_chunck_len; struct rte_mbuf *cur = m, *prev = m; + struct virtio_net_hdr tmp_hdr; struct virtio_net_hdr *hdr = NULL; /* A counter to avoid desc dead loop chain */ uint32_t nr_desc = 1; @@ -798,13 +1132,43 @@ copy_desc_to_mbuf(struct virtio_net *dev, struct vring_desc *descs, (desc->flags & VRING_DESC_F_INDIRECT)) return -1; - desc_addr = gpa_to_vva(dev, desc->addr); + desc_chunck_len = desc->len; + desc_gaddr = desc->addr; + desc_addr = gpa_to_vva(dev, desc_gaddr, &desc_chunck_len); if (unlikely(!desc_addr)) return -1; if (virtio_net_with_host_offload(dev)) { - hdr = (struct virtio_net_hdr *)((uintptr_t)desc_addr); - rte_prefetch0(hdr); + if (unlikely(desc_chunck_len < sizeof(struct virtio_net_hdr))) { + uint64_t len = desc_chunck_len; + uint64_t remain = sizeof(struct virtio_net_hdr); + uint64_t src = desc_addr; + uint64_t dst = (uint64_t)(uintptr_t)&tmp_hdr; + uint64_t guest_addr = desc_gaddr; + + /* + * No luck, the virtio-net header doesn't fit + * in a contiguous virtual area. + */ + while (remain) { + len = remain; + src = gpa_to_vva(dev, guest_addr, &len); + if (unlikely(!src || !len)) + return -1; + + rte_memcpy((void *)(uintptr_t)dst, + (void *)(uintptr_t)src, len); + + guest_addr += len; + remain -= len; + dst += len; + } + + hdr = &tmp_hdr; + } else { + hdr = (struct virtio_net_hdr *)((uintptr_t)desc_addr); + rte_prefetch0(hdr); + } } /* @@ -818,7 +1182,9 @@ copy_desc_to_mbuf(struct virtio_net *dev, struct vring_desc *descs, if (unlikely(desc->flags & VRING_DESC_F_INDIRECT)) return -1; - desc_addr = gpa_to_vva(dev, desc->addr); + desc_chunck_len = desc->len; + desc_gaddr = desc->addr; + desc_addr = gpa_to_vva(dev, desc_gaddr, &desc_chunck_len); if (unlikely(!desc_addr)) return -1; @@ -827,19 +1193,34 @@ copy_desc_to_mbuf(struct virtio_net *dev, struct vring_desc *descs, nr_desc += 1; } else { desc_avail = desc->len - dev->vhost_hlen; - desc_offset = dev->vhost_hlen; + + if (unlikely(desc_chunck_len < dev->vhost_hlen)) { + desc_chunck_len = desc_avail; + desc_gaddr += dev->vhost_hlen; + desc_addr = gpa_to_vva(dev, + desc_gaddr, + &desc_chunck_len); + if (unlikely(!desc_addr)) + return -1; + + desc_offset = 0; + } else { + desc_offset = dev->vhost_hlen; + desc_chunck_len -= dev->vhost_hlen; + } } rte_prefetch0((void *)(uintptr_t)(desc_addr + desc_offset)); - PRINT_PACKET(dev, (uintptr_t)(desc_addr + desc_offset), desc_avail, 0); + PRINT_PACKET(dev, (uintptr_t)(desc_addr + desc_offset), + (uint32_t)desc_chunck_len, 0); mbuf_offset = 0; mbuf_avail = m->buf_len - RTE_PKTMBUF_HEADROOM; while (1) { uint64_t hpa; - cpy_len = RTE_MIN(desc_avail, mbuf_avail); + cpy_len = RTE_MIN(desc_chunck_len, mbuf_avail); /* * A desc buf might across two host physical pages that are @@ -847,10 +1228,11 @@ copy_desc_to_mbuf(struct virtio_net *dev, struct vring_desc *descs, * will be copied even though zero copy is enabled. */ if (unlikely(dev->dequeue_zero_copy && (hpa = gpa_to_hpa(dev, - desc->addr + desc_offset, cpy_len)))) { + desc_gaddr + desc_offset, cpy_len)))) { cur->data_len = cpy_len; cur->data_off = 0; - cur->buf_addr = (void *)(uintptr_t)desc_addr; + cur->buf_addr = (void *)(uintptr_t)(desc_gaddr + + desc_offset); cur->buf_physaddr = hpa; /* @@ -868,6 +1250,7 @@ copy_desc_to_mbuf(struct virtio_net *dev, struct vring_desc *descs, mbuf_avail -= cpy_len; mbuf_offset += cpy_len; desc_avail -= cpy_len; + desc_chunck_len -= cpy_len; desc_offset += cpy_len; /* This desc reaches to its end, get the next one */ @@ -882,7 +1265,10 @@ copy_desc_to_mbuf(struct virtio_net *dev, struct vring_desc *descs, if (unlikely(desc->flags & VRING_DESC_F_INDIRECT)) return -1; - desc_addr = gpa_to_vva(dev, desc->addr); + desc_chunck_len = desc->len; + desc_gaddr = desc->addr; + desc_addr = gpa_to_vva(dev, desc_gaddr, + &desc_chunck_len); if (unlikely(!desc_addr)) return -1; @@ -891,7 +1277,21 @@ copy_desc_to_mbuf(struct virtio_net *dev, struct vring_desc *descs, desc_offset = 0; desc_avail = desc->len; - PRINT_PACKET(dev, (uintptr_t)desc_addr, desc->len, 0); + PRINT_PACKET(dev, (uintptr_t)desc_addr, + (uint32_t)desc_chunck_len, 0); + } else if (unlikely(desc_chunck_len == 0)) { + desc_chunck_len = desc_avail; + desc_gaddr += desc_offset; + desc_addr = gpa_to_vva(dev, + desc_gaddr, + &desc_chunck_len); + if (unlikely(!desc_addr)) + return -1; + + desc_offset = 0; + + PRINT_PACKET(dev, (uintptr_t)desc_addr, + (uint32_t)desc_chunck_len, 0); } /* @@ -905,6 +1305,8 @@ copy_desc_to_mbuf(struct virtio_net *dev, struct vring_desc *descs, "allocate memory for mbuf.\n"); return -1; } + if (unlikely(dev->dequeue_zero_copy)) + rte_mbuf_refcnt_update(cur, 1); prev->next = cur; prev->data_len = mbuf_offset; @@ -932,7 +1334,7 @@ update_used_ring(struct virtio_net *dev, struct vhost_virtqueue *vq, { vq->used->ring[used_idx].id = desc_idx; vq->used->ring[used_idx].len = 0; - vhost_log_used_vring(dev, vq, + vhost_log_cache_used_vring(dev, vq, offsetof(struct vring_used, ring[used_idx]), sizeof(vq->used->ring[used_idx])); } @@ -947,6 +1349,8 @@ update_used_idx(struct virtio_net *dev, struct vhost_virtqueue *vq, rte_smp_wmb(); rte_smp_rmb(); + vhost_log_cache_sync(dev, vq); + vq->used->idx += count; vhost_log_used_vring(dev, vq, offsetof(struct vring_used, idx), sizeof(vq->used->idx)); @@ -1000,6 +1404,22 @@ mbuf_is_consumed(struct rte_mbuf *m) return true; } +static inline void __attribute__((always_inline)) +restore_mbuf(struct rte_mbuf *m) +{ + uint32_t mbuf_size, priv_size; + + 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 */ + + m->buf_addr = (char *)m + mbuf_size; + m->buf_physaddr = rte_mempool_virt2phy(NULL, m) + mbuf_size; + m = m->next; + } +} + uint16_t rte_vhost_dequeue_burst(int vid, uint16_t queue_id, struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count) @@ -1024,9 +1444,13 @@ rte_vhost_dequeue_burst(int vid, uint16_t queue_id, } vq = dev->virtqueue[queue_id]; - if (unlikely(vq->enabled == 0)) + + if (unlikely(rte_spinlock_trylock(&vq->access_lock) == 0)) return 0; + if (unlikely(vq->enabled == 0)) + goto out_access_unlock; + if (unlikely(dev->dequeue_zero_copy)) { struct zcopy_mbuf *zmbuf, *next; int nr_updated = 0; @@ -1042,6 +1466,7 @@ rte_vhost_dequeue_burst(int vid, uint16_t queue_id, nr_updated += 1; TAILQ_REMOVE(&vq->zmbuf_list, zmbuf, next); + restore_mbuf(zmbuf->mbuf); rte_pktmbuf_free(zmbuf->mbuf); put_zmbuf(zmbuf); vq->nr_zmbuf -= 1; @@ -1056,14 +1481,26 @@ rte_vhost_dequeue_burst(int vid, uint16_t queue_id, * 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_cmpset((volatile uint16_t *) - &dev->broadcast_rarp.cnt, 1, 0))) { + + if (unlikely(rte_atomic16_read(&dev->broadcast_rarp) && + 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"); - return 0; + goto out_access_unlock; } if (make_rarp_packet(rarp_mbuf, &dev->mac)) { @@ -1077,9 +1514,9 @@ rte_vhost_dequeue_burst(int vid, uint16_t queue_id, free_entries = *((volatile uint16_t *)&vq->avail->idx) - vq->last_avail_idx; if (free_entries == 0) - goto out; + goto out_access_unlock; - LOG_DEBUG(VHOST_DATA, "(%d) %s\n", dev->vid, __func__); + VHOST_LOG_DEBUG(VHOST_DATA, "(%d) %s\n", dev->vid, __func__); /* Prefetch available and used ring */ avail_idx = vq->last_avail_idx & (vq->size - 1); @@ -1089,7 +1526,7 @@ rte_vhost_dequeue_burst(int vid, uint16_t queue_id, count = RTE_MIN(count, MAX_PKT_BURST); count = RTE_MIN(count, free_entries); - LOG_DEBUG(VHOST_DATA, "(%d) about to dequeue %u buffers\n", + VHOST_LOG_DEBUG(VHOST_DATA, "(%d) about to dequeue %u buffers\n", dev->vid, count); /* Retrieve all of the head indexes first to avoid caching issues. */ @@ -1105,19 +1542,35 @@ rte_vhost_dequeue_burst(int vid, uint16_t queue_id, /* Prefetch descriptor index. */ rte_prefetch0(&vq->desc[desc_indexes[0]]); for (i = 0; i < count; i++) { - struct vring_desc *desc; + struct vring_desc *desc, *idesc = NULL; uint16_t sz, idx; + uint64_t dlen; int err; if (likely(i + 1 < count)) rte_prefetch0(&vq->desc[desc_indexes[i + 1]]); if (vq->desc[desc_indexes[i]].flags & VRING_DESC_F_INDIRECT) { + dlen = vq->desc[desc_indexes[i]].len; desc = (struct vring_desc *)(uintptr_t)gpa_to_vva(dev, - vq->desc[desc_indexes[i]].addr); + vq->desc[desc_indexes[i]].addr, + &dlen); if (unlikely(!desc)) break; + if (unlikely(dlen < vq->desc[desc_indexes[i]].len)) { + /* + * The indirect desc table is not contiguous + * in process VA space, we have to copy it. + */ + idesc = alloc_copy_ind_table(dev, + &vq->desc[desc_indexes[i]]); + if (unlikely(!idesc)) + break; + + desc = idesc; + } + rte_prefetch0(desc); sz = vq->desc[desc_indexes[i]].len / sizeof(*desc); idx = 0; @@ -1131,12 +1584,14 @@ rte_vhost_dequeue_burst(int vid, uint16_t queue_id, if (unlikely(pkts[i] == NULL)) { RTE_LOG(ERR, VHOST_DATA, "Failed to allocate memory for mbuf.\n"); + free_ind_table(idesc); break; } err = copy_desc_to_mbuf(dev, desc, sz, pkts[i], idx, mbuf_pool); if (unlikely(err)) { rte_pktmbuf_free(pkts[i]); + free_ind_table(idesc); break; } @@ -1146,6 +1601,7 @@ rte_vhost_dequeue_burst(int vid, uint16_t queue_id, zmbuf = get_zmbuf(vq); if (!zmbuf) { rte_pktmbuf_free(pkts[i]); + free_ind_table(idesc); break; } zmbuf->mbuf = pkts[i]; @@ -1162,6 +1618,9 @@ rte_vhost_dequeue_burst(int vid, uint16_t queue_id, vq->nr_zmbuf += 1; TAILQ_INSERT_TAIL(&vq->zmbuf_list, zmbuf, next); } + + if (unlikely(!!idesc)) + free_ind_table(idesc); } vq->last_avail_idx += i; @@ -1170,7 +1629,9 @@ rte_vhost_dequeue_burst(int vid, uint16_t queue_id, update_used_idx(dev, vq, i); } -out: +out_access_unlock: + rte_spinlock_unlock(&vq->access_lock); + if (unlikely(rarp_mbuf != NULL)) { /* * Inject it to the head of "pkts" array, so that switch's mac