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-rw-r--r--examples/vhost/virtio_net.c94
1 files changed, 83 insertions, 11 deletions
diff --git a/examples/vhost/virtio_net.c b/examples/vhost/virtio_net.c
index f6e00674..5a965a34 100644
--- a/examples/vhost/virtio_net.c
+++ b/examples/vhost/virtio_net.c
@@ -56,16 +56,20 @@ enqueue_pkt(struct vhost_dev *dev, struct rte_vhost_vring *vr,
struct rte_mbuf *m, uint16_t desc_idx)
{
uint32_t desc_avail, desc_offset;
+ uint64_t desc_chunck_len;
uint32_t mbuf_avail, mbuf_offset;
uint32_t cpy_len;
struct vring_desc *desc;
- uint64_t desc_addr;
+ uint64_t desc_addr, desc_gaddr;
struct virtio_net_hdr virtio_hdr = {0, 0, 0, 0, 0, 0};
/* A counter to avoid desc dead loop chain */
uint16_t nr_desc = 1;
desc = &vr->desc[desc_idx];
- desc_addr = rte_vhost_gpa_to_vva(dev->mem, desc->addr);
+ desc_chunck_len = desc->len;
+ desc_gaddr = desc->addr;
+ desc_addr = rte_vhost_va_from_guest_pa(
+ dev->mem, 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
@@ -77,9 +81,42 @@ enqueue_pkt(struct vhost_dev *dev, struct rte_vhost_vring *vr,
rte_prefetch0((void *)(uintptr_t)desc_addr);
/* write virtio-net header */
- *(struct virtio_net_hdr *)(uintptr_t)desc_addr = virtio_hdr;
+ if (likely(desc_chunck_len >= dev->hdr_len)) {
+ *(struct virtio_net_hdr *)(uintptr_t)desc_addr = virtio_hdr;
+ desc_offset = dev->hdr_len;
+ } else {
+ uint64_t len;
+ uint64_t remain = dev->hdr_len;
+ uint64_t src = (uint64_t)(uintptr_t)&virtio_hdr, dst;
+ uint64_t guest_addr = desc_gaddr;
+
+ while (remain) {
+ len = remain;
+ dst = rte_vhost_va_from_guest_pa(dev->mem,
+ guest_addr, &len);
+ if (unlikely(!dst || !len))
+ return -1;
+
+ rte_memcpy((void *)(uintptr_t)dst,
+ (void *)(uintptr_t)src,
+ len);
+
+ remain -= len;
+ guest_addr += len;
+ dst += len;
+ }
+
+ desc_chunck_len = desc->len - dev->hdr_len;
+ desc_gaddr += dev->hdr_len;
+ desc_addr = rte_vhost_va_from_guest_pa(
+ dev->mem, desc_gaddr,
+ &desc_chunck_len);
+ if (unlikely(!desc_addr))
+ return -1;
+
+ desc_offset = 0;
+ }
- desc_offset = dev->hdr_len;
desc_avail = desc->len - dev->hdr_len;
mbuf_avail = rte_pktmbuf_data_len(m);
@@ -104,15 +141,28 @@ enqueue_pkt(struct vhost_dev *dev, struct rte_vhost_vring *vr,
return -1;
desc = &vr->desc[desc->next];
- desc_addr = rte_vhost_gpa_to_vva(dev->mem, desc->addr);
+ desc_chunck_len = desc->len;
+ desc_gaddr = desc->addr;
+ desc_addr = rte_vhost_va_from_guest_pa(
+ dev->mem, 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 = rte_vhost_va_from_guest_pa(dev->mem,
+ desc_gaddr,
+ &desc_chunck_len);
+ if (unlikely(!desc_addr))
+ return -1;
+
+ desc_offset = 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);
@@ -121,6 +171,7 @@ enqueue_pkt(struct vhost_dev *dev, struct rte_vhost_vring *vr,
mbuf_offset += cpy_len;
desc_avail -= cpy_len;
desc_offset += cpy_len;
+ desc_chunck_len -= cpy_len;
}
return 0;
@@ -189,8 +240,9 @@ dequeue_pkt(struct vhost_dev *dev, struct rte_vhost_vring *vr,
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;
+ uint64_t desc_chunck_len;
uint32_t mbuf_avail, mbuf_offset;
uint32_t cpy_len;
struct rte_mbuf *cur = m, *prev = m;
@@ -202,7 +254,10 @@ dequeue_pkt(struct vhost_dev *dev, struct rte_vhost_vring *vr,
(desc->flags & VRING_DESC_F_INDIRECT))
return -1;
- desc_addr = rte_vhost_gpa_to_vva(dev->mem, desc->addr);
+ desc_chunck_len = desc->len;
+ desc_gaddr = desc->addr;
+ desc_addr = rte_vhost_va_from_guest_pa(
+ dev->mem, desc_gaddr, &desc_chunck_len);
if (unlikely(!desc_addr))
return -1;
@@ -216,7 +271,10 @@ dequeue_pkt(struct vhost_dev *dev, struct rte_vhost_vring *vr,
* header.
*/
desc = &vr->desc[desc->next];
- desc_addr = rte_vhost_gpa_to_vva(dev->mem, desc->addr);
+ desc_chunck_len = desc->len;
+ desc_gaddr = desc->addr;
+ desc_addr = rte_vhost_va_from_guest_pa(
+ dev->mem, desc_gaddr, &desc_chunck_len);
if (unlikely(!desc_addr))
return -1;
rte_prefetch0((void *)(uintptr_t)desc_addr);
@@ -228,7 +286,7 @@ dequeue_pkt(struct vhost_dev *dev, struct rte_vhost_vring *vr,
mbuf_offset = 0;
mbuf_avail = m->buf_len - RTE_PKTMBUF_HEADROOM;
while (1) {
- cpy_len = RTE_MIN(desc_avail, mbuf_avail);
+ cpy_len = RTE_MIN(desc_chunck_len, mbuf_avail);
rte_memcpy(rte_pktmbuf_mtod_offset(cur, void *,
mbuf_offset),
(void *)((uintptr_t)(desc_addr + desc_offset)),
@@ -238,6 +296,7 @@ dequeue_pkt(struct vhost_dev *dev, struct rte_vhost_vring *vr,
mbuf_offset += cpy_len;
desc_avail -= cpy_len;
desc_offset += cpy_len;
+ desc_chunck_len -= cpy_len;
/* This desc reaches to its end, get the next one */
if (desc_avail == 0) {
@@ -249,13 +308,26 @@ dequeue_pkt(struct vhost_dev *dev, struct rte_vhost_vring *vr,
return -1;
desc = &vr->desc[desc->next];
- desc_addr = rte_vhost_gpa_to_vva(dev->mem, desc->addr);
+ desc_chunck_len = desc->len;
+ desc_gaddr = desc->addr;
+ desc_addr = rte_vhost_va_from_guest_pa(
+ dev->mem, desc_gaddr, &desc_chunck_len);
if (unlikely(!desc_addr))
return -1;
rte_prefetch0((void *)(uintptr_t)desc_addr);
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 = rte_vhost_va_from_guest_pa(dev->mem,
+ desc_gaddr,
+ &desc_chunck_len);
+ if (unlikely(!desc_addr))
+ return -1;
+
+ desc_offset = 0;
}
/*