vhost: move per-vq net specific fields out to net

This will remove the need for vhost scsi to pull
in virtio-net.h.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 27 insertions, 16 deletions

diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 8672e0538d59..e34e195b9cf6 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -72,6 +72,12 @@ struct vhost_ubuf_ref {
 
 struct vhost_net_virtqueue {
         struct vhost_virtqueue vq;
+        /* hdr is used to store the virtio header.
+         * Since each iovec has >= 1 byte length, we never need more than
+         * header length entries to store the header. */
+        struct iovec hdr[sizeof(struct virtio_net_hdr_mrg_rxbuf)];
+        size_t vhost_hlen;
+        size_t sock_hlen;
         /* vhost zerocopy support fields below: */
         /* last used idx for outstanding DMA zerocopy buffers */
         int upend_idx;
@@ -166,7 +172,7 @@ err:
         return -ENOMEM;
 }
 
-void vhost_net_reset_ubuf_info(struct vhost_net *n)
+void vhost_net_vq_reset(struct vhost_net *n)
 {
         int i;
 
@@ -176,6 +182,8 @@ void vhost_net_reset_ubuf_info(struct vhost_net *n)
                 n->vqs[i].ubufs = NULL;
                 kfree(n->vqs[i].ubuf_info);
                 n->vqs[i].ubuf_info = NULL;
+                n->vqs[i].vhost_hlen = 0;
+                n->vqs[i].sock_hlen = 0;
         }
 
 }
@@ -302,8 +310,8 @@ static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success)
  * read-size critical section for our kind of RCU. */
 static void handle_tx(struct vhost_net *net)
 {
-        struct vhost_virtqueue *vq = &net->vqs[VHOST_NET_VQ_TX].vq;
         struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX];
+        struct vhost_virtqueue *vq = &nvq->vq;
         unsigned out, in, s;
         int head;
         struct msghdr msg = {
@@ -329,7 +337,7 @@ static void handle_tx(struct vhost_net *net)
         mutex_lock(&vq->mutex);
         vhost_disable_notify(&net->dev, vq);
 
-        hdr_size = vq->vhost_hlen;
+        hdr_size = nvq->vhost_hlen;
         zcopy = nvq->ubufs;
 
         for (;;) {
@@ -369,14 +377,14 @@ static void handle_tx(struct vhost_net *net)
                         break;
                 }
                 /* Skip header. TODO: support TSO. */
-                s = move_iovec_hdr(vq->iov, vq->hdr, hdr_size, out);
+                s = move_iovec_hdr(vq->iov, nvq->hdr, hdr_size, out);
                 msg.msg_iovlen = out;
                 len = iov_length(vq->iov, out);
                 /* Sanity check */
                 if (!len) {
                         vq_err(vq, "Unexpected header len for TX: "
                                "%zd expected %zd\n",
-                               iov_length(vq->hdr, s), hdr_size);
+                               iov_length(nvq->hdr, s), hdr_size);
                         break;
                 }
                 zcopy_used = zcopy && (len >= VHOST_GOODCOPY_LEN ||
@@ -523,7 +531,8 @@ err:
  * read-size critical section for our kind of RCU. */
 static void handle_rx(struct vhost_net *net)
 {
-        struct vhost_virtqueue *vq = &net->vqs[VHOST_NET_VQ_RX].vq;
+        struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_RX];
+        struct vhost_virtqueue *vq = &nvq->vq;
         unsigned uninitialized_var(in), log;
         struct vhost_log *vq_log;
         struct msghdr msg = {
@@ -551,8 +560,8 @@ static void handle_rx(struct vhost_net *net)
 
         mutex_lock(&vq->mutex);
         vhost_disable_notify(&net->dev, vq);
-        vhost_hlen = vq->vhost_hlen;
-        sock_hlen = vq->sock_hlen;
+        vhost_hlen = nvq->vhost_hlen;
+        sock_hlen = nvq->sock_hlen;
 
         vq_log = unlikely(vhost_has_feature(&net->dev, VHOST_F_LOG_ALL)) ?
                 vq->log : NULL;
@@ -582,11 +591,11 @@ static void handle_rx(struct vhost_net *net)
                 /* We don't need to be notified again. */
                 if (unlikely((vhost_hlen)))
                         /* Skip header. TODO: support TSO. */
-                        move_iovec_hdr(vq->iov, vq->hdr, vhost_hlen, in);
+                        move_iovec_hdr(vq->iov, nvq->hdr, vhost_hlen, in);
                 else
                         /* Copy the header for use in VIRTIO_NET_F_MRG_RXBUF:
                          * needed because recvmsg can modify msg_iov. */
-                        copy_iovec_hdr(vq->iov, vq->hdr, sock_hlen, in);
+                        copy_iovec_hdr(vq->iov, nvq->hdr, sock_hlen, in);
                 msg.msg_iovlen = in;
                 err = sock->ops->recvmsg(NULL, sock, &msg,
                                          sock_len, MSG_DONTWAIT | MSG_TRUNC);
@@ -600,7 +609,7 @@ static void handle_rx(struct vhost_net *net)
                         continue;
                 }
                 if (unlikely(vhost_hlen) &&
-                    memcpy_toiovecend(vq->hdr, (unsigned char *)&hdr, 0,
+                    memcpy_toiovecend(nvq->hdr, (unsigned char *)&hdr, 0,
                                       vhost_hlen)) {
                         vq_err(vq, "Unable to write vnet_hdr at addr %p\n",
                                vq->iov->iov_base);
@@ -608,7 +617,7 @@ static void handle_rx(struct vhost_net *net)
                 }
                 /* TODO: Should check and handle checksum. */
                 if (likely(mergeable) &&
-                    memcpy_toiovecend(vq->hdr, (unsigned char *)&headcount,
+                    memcpy_toiovecend(nvq->hdr, (unsigned char *)&headcount,
                                       offsetof(typeof(hdr), num_buffers),
                                       sizeof hdr.num_buffers)) {
                         vq_err(vq, "Failed num_buffers write");
@@ -686,6 +695,8 @@ static int vhost_net_open(struct inode *inode, struct file *f)
                 n->vqs[i].ubuf_info = NULL;
                 n->vqs[i].upend_idx = 0;
                 n->vqs[i].done_idx = 0;
+                n->vqs[i].vhost_hlen = 0;
+                n->vqs[i].sock_hlen = 0;
         }
         r = vhost_dev_init(dev, vqs, VHOST_NET_VQ_MAX);
         if (r < 0) {
@@ -783,7 +794,7 @@ static int vhost_net_release(struct inode *inode, struct file *f)
         vhost_net_flush(n);
         vhost_dev_stop(&n->dev);
         vhost_dev_cleanup(&n->dev, false);
-        vhost_net_reset_ubuf_info(n);
+        vhost_net_vq_reset(n);
         if (tx_sock)
                 fput(tx_sock->file);
         if (rx_sock)
@@ -964,7 +975,7 @@ static long vhost_net_reset_owner(struct vhost_net *n)
         vhost_net_stop(n, &tx_sock, &rx_sock);
         vhost_net_flush(n);
         err = vhost_dev_reset_owner(&n->dev);
-        vhost_net_reset_ubuf_info(n);
+        vhost_net_vq_reset(n);
 done:
         mutex_unlock(&n->dev.mutex);
         if (tx_sock)
@@ -1001,8 +1012,8 @@ static int vhost_net_set_features(struct vhost_net *n, u64 features)
         smp_wmb();
         for (i = 0; i < VHOST_NET_VQ_MAX; ++i) {
                 mutex_lock(&n->vqs[i].vq.mutex);
-                n->vqs[i].vq.vhost_hlen = vhost_hlen;
-                n->vqs[i].vq.sock_hlen = sock_hlen;
+                n->vqs[i].vhost_hlen = vhost_hlen;
+                n->vqs[i].sock_hlen = sock_hlen;
                 mutex_unlock(&n->vqs[i].vq.mutex);
         }
         vhost_net_flush(n);