Imported Upstream version 17.05

Change-Id: Id1e419c5a214e4a18739663b91f0f9a549f1fdc6
Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>

1 files changed, 60 insertions, 74 deletions

diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index 337470d6..48219e05 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -39,7 +39,7 @@
 #include <rte_memcpy.h>
 #include <rte_ether.h>
 #include <rte_ip.h>
-#include <rte_virtio_net.h>
+#include <rte_vhost.h>
 #include <rte_tcp.h>
 #include <rte_udp.h>
 #include <rte_sctp.h>
@@ -48,47 +48,11 @@
 #include "vhost.h"
 
 #define MAX_PKT_BURST 32
-#define VHOST_LOG_PAGE	4096
-
-static inline void __attribute__((always_inline))
-vhost_log_page(uint8_t *log_base, uint64_t page)
-{
-	log_base[page / 8] |= 1 << (page % 8);
-}
-
-static inline void __attribute__((always_inline))
-vhost_log_write(struct virtio_net *dev, 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;
-
-	/* To make sure guest memory updates are committed before logging */
-	rte_smp_wmb();
-
-	page = addr / VHOST_LOG_PAGE;
-	while (page * VHOST_LOG_PAGE < addr + len) {
-		vhost_log_page((uint8_t *)(uintptr_t)dev->log_base, page);
-		page += 1;
-	}
-}
-
-static inline void __attribute__((always_inline))
-vhost_log_used_vring(struct virtio_net *dev, struct vhost_virtqueue *vq,
-		     uint64_t offset, uint64_t len)
-{
-	vhost_log_write(dev, vq->log_guest_addr + offset, len);
-}
 
 static bool
-is_valid_virt_queue_idx(uint32_t idx, int is_tx, uint32_t qp_nb)
+is_valid_virt_queue_idx(uint32_t idx, int is_tx, uint32_t nr_vring)
 {
-	return (is_tx ^ (idx & 1)) == 0 && idx < qp_nb * VIRTIO_QNUM;
+	return (is_tx ^ (idx & 1)) == 0 && idx < nr_vring;
 }
 
 static inline void __attribute__((always_inline))
@@ -141,6 +105,12 @@ update_shadow_used_ring(struct vhost_virtqueue *vq,
 	vq->shadow_used_ring[i].len = len;
 }
 
+/* avoid write operation when necessary, to lessen cache issues */
+#define ASSIGN_UNLESS_EQUAL(var, val) do {	\
+	if ((var) != (val))			\
+		(var) = (val);			\
+} while (0)
+
 static void
 virtio_enqueue_offload(struct rte_mbuf *m_buf, struct virtio_net_hdr *net_hdr)
 {
@@ -162,6 +132,10 @@ virtio_enqueue_offload(struct rte_mbuf *m_buf, struct virtio_net_hdr *net_hdr)
 						cksum));
 			break;
 		}
+	} else {
+		ASSIGN_UNLESS_EQUAL(net_hdr->csum_start, 0);
+		ASSIGN_UNLESS_EQUAL(net_hdr->csum_offset, 0);
+		ASSIGN_UNLESS_EQUAL(net_hdr->flags, 0);
 	}
 
 	if (m_buf->ol_flags & PKT_TX_TCP_SEG) {
@@ -172,19 +146,13 @@ virtio_enqueue_offload(struct rte_mbuf *m_buf, struct virtio_net_hdr *net_hdr)
 		net_hdr->gso_size = m_buf->tso_segsz;
 		net_hdr->hdr_len = m_buf->l2_len + m_buf->l3_len
 					+ m_buf->l4_len;
+	} else {
+		ASSIGN_UNLESS_EQUAL(net_hdr->gso_type, 0);
+		ASSIGN_UNLESS_EQUAL(net_hdr->gso_size, 0);
+		ASSIGN_UNLESS_EQUAL(net_hdr->hdr_len, 0);
 	}
 }
 
-static inline void
-copy_virtio_net_hdr(struct virtio_net *dev, uint64_t desc_addr,
-		    struct virtio_net_hdr_mrg_rxbuf hdr)
-{
-	if (dev->vhost_hlen == sizeof(struct virtio_net_hdr_mrg_rxbuf))
-		*(struct virtio_net_hdr_mrg_rxbuf *)(uintptr_t)desc_addr = hdr;
-	else
-		*(struct virtio_net_hdr *)(uintptr_t)desc_addr = hdr.hdr;
-}
-
 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)
@@ -194,12 +162,11 @@ copy_mbuf_to_desc(struct virtio_net *dev, struct vring_desc *descs,
 	uint32_t cpy_len;
 	struct vring_desc *desc;
 	uint64_t desc_addr;
-	struct virtio_net_hdr_mrg_rxbuf virtio_hdr = {{0, 0, 0, 0, 0, 0}, 0};
 	/* 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_addr = rte_vhost_gpa_to_vva(dev->mem, desc->addr);
 	/*
 	 * Checking of 'desc_addr' placed outside of 'unlikely' macro to avoid
 	 * performance issue with some versions of gcc (4.8.4 and 5.3.0) which
@@ -210,8 +177,7 @@ 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);
+	virtio_enqueue_offload(m, (struct virtio_net_hdr *)(uintptr_t)desc_addr);
 	vhost_log_write(dev, desc->addr, dev->vhost_hlen);
 	PRINT_PACKET(dev, (uintptr_t)desc_addr, dev->vhost_hlen, 0);
 
@@ -239,7 +205,7 @@ 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_addr = rte_vhost_gpa_to_vva(dev->mem, desc->addr);
 			if (unlikely(!desc_addr))
 				return -1;
 
@@ -283,7 +249,7 @@ virtio_dev_rx(struct virtio_net *dev, uint16_t queue_id,
 	uint32_t i, sz;
 
 	LOG_DEBUG(VHOST_DATA, "(%d) %s\n", dev->vid, __func__);
-	if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->virt_qp_nb))) {
+	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;
@@ -323,7 +289,8 @@ virtio_dev_rx(struct virtio_net *dev, uint16_t queue_id,
 		int err;
 
 		if (vq->desc[desc_idx].flags & VRING_DESC_F_INDIRECT) {
-			descs = (struct vring_desc *)(uintptr_t)gpa_to_vva(dev,
+			descs = (struct vring_desc *)(uintptr_t)
+				rte_vhost_gpa_to_vva(dev->mem,
 					vq->desc[desc_idx].addr);
 			if (unlikely(!descs)) {
 				count = i;
@@ -383,7 +350,7 @@ fill_vec_buf(struct virtio_net *dev, struct vhost_virtqueue *vq,
 
 	if (vq->desc[idx].flags & VRING_DESC_F_INDIRECT) {
 		descs = (struct vring_desc *)(uintptr_t)
-					gpa_to_vva(dev, vq->desc[idx].addr);
+			rte_vhost_gpa_to_vva(dev->mem, vq->desc[idx].addr);
 		if (unlikely(!descs))
 			return -1;
 
@@ -461,7 +428,6 @@ 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)
 {
-	struct virtio_net_hdr_mrg_rxbuf virtio_hdr = {{0, 0, 0, 0, 0, 0}, 0};
 	uint32_t vec_idx = 0;
 	uint64_t desc_addr;
 	uint32_t mbuf_offset, mbuf_avail;
@@ -473,7 +439,7 @@ 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);
+	desc_addr = rte_vhost_gpa_to_vva(dev->mem, buf_vec[vec_idx].buf_addr);
 	if (buf_vec[vec_idx].buf_len < dev->vhost_hlen || !desc_addr)
 		return -1;
 
@@ -482,7 +448,6 @@ copy_mbuf_to_desc_mergeable(struct virtio_net *dev, struct rte_mbuf *m,
 	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",
 		dev->vid, num_buffers);
 
@@ -495,7 +460,8 @@ 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_addr = rte_vhost_gpa_to_vva(dev->mem,
+					buf_vec[vec_idx].buf_addr);
 			if (unlikely(!desc_addr))
 				return -1;
 
@@ -514,8 +480,13 @@ 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);
+			struct virtio_net_hdr_mrg_rxbuf *hdr;
+
+			hdr = (struct virtio_net_hdr_mrg_rxbuf *)(uintptr_t)
+				hdr_addr;
+			virtio_enqueue_offload(hdr_mbuf, &hdr->hdr);
+			ASSIGN_UNLESS_EQUAL(hdr->num_buffers, num_buffers);
+
 			vhost_log_write(dev, hdr_phys_addr, dev->vhost_hlen);
 			PRINT_PACKET(dev, (uintptr_t)hdr_addr,
 				     dev->vhost_hlen, 0);
@@ -552,7 +523,7 @@ virtio_dev_merge_rx(struct virtio_net *dev, uint16_t queue_id,
 	uint16_t avail_head;
 
 	LOG_DEBUG(VHOST_DATA, "(%d) %s\n", dev->vid, __func__);
-	if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->virt_qp_nb))) {
+	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;
@@ -663,14 +634,14 @@ parse_ethernet(struct rte_mbuf *m, uint16_t *l4_proto, void **l4_hdr)
 
 	switch (ethertype) {
 	case ETHER_TYPE_IPv4:
-		ipv4_hdr = (struct ipv4_hdr *)l3_hdr;
+		ipv4_hdr = l3_hdr;
 		*l4_proto = ipv4_hdr->next_proto_id;
 		m->l3_len = (ipv4_hdr->version_ihl & 0x0f) * 4;
 		*l4_hdr = (char *)l3_hdr + m->l3_len;
 		m->ol_flags |= PKT_TX_IPV4;
 		break;
 	case ETHER_TYPE_IPv6:
-		ipv6_hdr = (struct ipv6_hdr *)l3_hdr;
+		ipv6_hdr = l3_hdr;
 		*l4_proto = ipv6_hdr->proto;
 		m->l3_len = sizeof(struct ipv6_hdr);
 		*l4_hdr = (char *)l3_hdr + m->l3_len;
@@ -720,7 +691,7 @@ vhost_dequeue_offload(struct virtio_net_hdr *hdr, struct rte_mbuf *m)
 		switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
 		case VIRTIO_NET_HDR_GSO_TCPV4:
 		case VIRTIO_NET_HDR_GSO_TCPV6:
-			tcp_hdr = (struct tcp_hdr *)l4_hdr;
+			tcp_hdr = l4_hdr;
 			m->ol_flags |= PKT_TX_TCP_SEG;
 			m->tso_segsz = hdr->gso_size;
 			m->l4_len = (tcp_hdr->data_off & 0xf0) >> 2;
@@ -798,7 +769,7 @@ 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_addr = rte_vhost_gpa_to_vva(dev->mem, desc->addr);
 	if (unlikely(!desc_addr))
 		return -1;
 
@@ -818,7 +789,7 @@ 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_addr = rte_vhost_gpa_to_vva(dev->mem, desc->addr);
 		if (unlikely(!desc_addr))
 			return -1;
 
@@ -882,7 +853,7 @@ 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_addr = rte_vhost_gpa_to_vva(dev->mem, desc->addr);
 			if (unlikely(!desc_addr))
 				return -1;
 
@@ -905,6 +876,8 @@ 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;
@@ -1017,7 +990,7 @@ rte_vhost_dequeue_burst(int vid, uint16_t queue_id,
 	if (!dev)
 		return 0;
 
-	if (unlikely(!is_valid_virt_queue_idx(queue_id, 1, dev->virt_qp_nb))) {
+	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;
@@ -1056,9 +1029,21 @@ 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,
@@ -1113,7 +1098,8 @@ rte_vhost_dequeue_burst(int vid, uint16_t queue_id,
 			rte_prefetch0(&vq->desc[desc_indexes[i + 1]]);
 
 		if (vq->desc[desc_indexes[i]].flags & VRING_DESC_F_INDIRECT) {
-			desc = (struct vring_desc *)(uintptr_t)gpa_to_vva(dev,
+			desc = (struct vring_desc *)(uintptr_t)
+				rte_vhost_gpa_to_vva(dev->mem,
 					vq->desc[desc_indexes[i]].addr);
 			if (unlikely(!desc))
 				break;