summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
Diffstat
-rw-r--r--drivers/vhost/net.c100
-rw-r--r--drivers/vhost/scsi.c8
-rw-r--r--drivers/vhost/vhost.c4
-rw-r--r--drivers/vhost/vhost.h10
4 files changed, 71 insertions, 51 deletions
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index a3645bd163d..2b51e2336aa 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -59,12 +59,18 @@ MODULE_PARM_DESC(experimental_zcopytx, "Enable Zero Copy TX;"
#define VHOST_DMA_IS_DONE(len) ((len) >= VHOST_DMA_DONE_LEN)
enum {
+ VHOST_NET_FEATURES = VHOST_FEATURES |
+ (1ULL << VHOST_NET_F_VIRTIO_NET_HDR) |
+ (1ULL << VIRTIO_NET_F_MRG_RXBUF),
+};
+
+enum {
VHOST_NET_VQ_RX = 0,
VHOST_NET_VQ_TX = 1,
VHOST_NET_VQ_MAX = 2,
};
-struct vhost_ubuf_ref {
+struct vhost_net_ubuf_ref {
struct kref kref;
wait_queue_head_t wait;
struct vhost_virtqueue *vq;
@@ -87,7 +93,7 @@ struct vhost_net_virtqueue {
struct ubuf_info *ubuf_info;
/* Reference counting for outstanding ubufs.
* Protected by vq mutex. Writers must also take device mutex. */
- struct vhost_ubuf_ref *ubufs;
+ struct vhost_net_ubuf_ref *ubufs;
};
struct vhost_net {
@@ -104,24 +110,25 @@ struct vhost_net {
bool tx_flush;
};
-static unsigned vhost_zcopy_mask __read_mostly;
+static unsigned vhost_net_zcopy_mask __read_mostly;
-void vhost_enable_zcopy(int vq)
+static void vhost_net_enable_zcopy(int vq)
{
- vhost_zcopy_mask |= 0x1 << vq;
+ vhost_net_zcopy_mask |= 0x1 << vq;
}
-static void vhost_zerocopy_done_signal(struct kref *kref)
+static void vhost_net_zerocopy_done_signal(struct kref *kref)
{
- struct vhost_ubuf_ref *ubufs = container_of(kref, struct vhost_ubuf_ref,
- kref);
+ struct vhost_net_ubuf_ref *ubufs;
+
+ ubufs = container_of(kref, struct vhost_net_ubuf_ref, kref);
wake_up(&ubufs->wait);
}
-struct vhost_ubuf_ref *vhost_ubuf_alloc(struct vhost_virtqueue *vq,
- bool zcopy)
+static struct vhost_net_ubuf_ref *
+vhost_net_ubuf_alloc(struct vhost_virtqueue *vq, bool zcopy)
{
- struct vhost_ubuf_ref *ubufs;
+ struct vhost_net_ubuf_ref *ubufs;
/* No zero copy backend? Nothing to count. */
if (!zcopy)
return NULL;
@@ -134,25 +141,38 @@ struct vhost_ubuf_ref *vhost_ubuf_alloc(struct vhost_virtqueue *vq,
return ubufs;
}
-void vhost_ubuf_put(struct vhost_ubuf_ref *ubufs)
+static void vhost_net_ubuf_put(struct vhost_net_ubuf_ref *ubufs)
{
- kref_put(&ubufs->kref, vhost_zerocopy_done_signal);
+ kref_put(&ubufs->kref, vhost_net_zerocopy_done_signal);
}
-void vhost_ubuf_put_and_wait(struct vhost_ubuf_ref *ubufs)
+static void vhost_net_ubuf_put_and_wait(struct vhost_net_ubuf_ref *ubufs)
{
- kref_put(&ubufs->kref, vhost_zerocopy_done_signal);
+ kref_put(&ubufs->kref, vhost_net_zerocopy_done_signal);
wait_event(ubufs->wait, !atomic_read(&ubufs->kref.refcount));
kfree(ubufs);
}
+static void vhost_net_clear_ubuf_info(struct vhost_net *n)
+{
+
+ bool zcopy;
+ int i;
+
+ for (i = 0; i < n->dev.nvqs; ++i) {
+ zcopy = vhost_net_zcopy_mask & (0x1 << i);
+ if (zcopy)
+ kfree(n->vqs[i].ubuf_info);
+ }
+}
+
int vhost_net_set_ubuf_info(struct vhost_net *n)
{
bool zcopy;
int i;
for (i = 0; i < n->dev.nvqs; ++i) {
- zcopy = vhost_zcopy_mask & (0x1 << i);
+ zcopy = vhost_net_zcopy_mask & (0x1 << i);
if (!zcopy)
continue;
n->vqs[i].ubuf_info = kmalloc(sizeof(*n->vqs[i].ubuf_info) *
@@ -164,7 +184,7 @@ int vhost_net_set_ubuf_info(struct vhost_net *n)
err:
while (i--) {
- zcopy = vhost_zcopy_mask & (0x1 << i);
+ zcopy = vhost_net_zcopy_mask & (0x1 << i);
if (!zcopy)
continue;
kfree(n->vqs[i].ubuf_info);
@@ -286,7 +306,7 @@ static int vhost_zerocopy_signal_used(struct vhost_net *net,
static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success)
{
- struct vhost_ubuf_ref *ubufs = ubuf->ctx;
+ struct vhost_net_ubuf_ref *ubufs = ubuf->ctx;
struct vhost_virtqueue *vq = ubufs->vq;
int cnt = atomic_read(&ubufs->kref.refcount);
@@ -303,7 +323,7 @@ static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success)
/* set len to mark this desc buffers done DMA */
vq->heads[ubuf->desc].len = success ?
VHOST_DMA_DONE_LEN : VHOST_DMA_FAILED_LEN;
- vhost_ubuf_put(ubufs);
+ vhost_net_ubuf_put(ubufs);
}
/* Expects to be always run from workqueue - which acts as
@@ -326,7 +346,7 @@ static void handle_tx(struct vhost_net *net)
int err;
size_t hdr_size;
struct socket *sock;
- struct vhost_ubuf_ref *uninitialized_var(ubufs);
+ struct vhost_net_ubuf_ref *uninitialized_var(ubufs);
bool zcopy, zcopy_used;
/* TODO: check that we are running from vhost_worker? */
@@ -422,7 +442,7 @@ static void handle_tx(struct vhost_net *net)
if (unlikely(err < 0)) {
if (zcopy_used) {
if (ubufs)
- vhost_ubuf_put(ubufs);
+ vhost_net_ubuf_put(ubufs);
nvq->upend_idx = ((unsigned)nvq->upend_idx - 1)
% UIO_MAXIOV;
}
@@ -776,7 +796,7 @@ static void vhost_net_flush(struct vhost_net *n)
n->tx_flush = true;
mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex);
/* Wait for all lower device DMAs done. */
- vhost_ubuf_put_and_wait(n->vqs[VHOST_NET_VQ_TX].ubufs);
+ vhost_net_ubuf_put_and_wait(n->vqs[VHOST_NET_VQ_TX].ubufs);
mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex);
n->tx_flush = false;
kref_init(&n->vqs[VHOST_NET_VQ_TX].ubufs->kref);
@@ -877,7 +897,7 @@ static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd)
struct socket *sock, *oldsock;
struct vhost_virtqueue *vq;
struct vhost_net_virtqueue *nvq;
- struct vhost_ubuf_ref *ubufs, *oldubufs = NULL;
+ struct vhost_net_ubuf_ref *ubufs, *oldubufs = NULL;
int r;
mutex_lock(&n->dev.mutex);
@@ -908,7 +928,8 @@ static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd)
oldsock = rcu_dereference_protected(vq->private_data,
lockdep_is_held(&vq->mutex));
if (sock != oldsock) {
- ubufs = vhost_ubuf_alloc(vq, sock && vhost_sock_zcopy(sock));
+ ubufs = vhost_net_ubuf_alloc(vq,
+ sock && vhost_sock_zcopy(sock));
if (IS_ERR(ubufs)) {
r = PTR_ERR(ubufs);
goto err_ubufs;
@@ -934,7 +955,7 @@ static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd)
mutex_unlock(&vq->mutex);
if (oldubufs) {
- vhost_ubuf_put_and_wait(oldubufs);
+ vhost_net_ubuf_put_and_wait(oldubufs);
mutex_lock(&vq->mutex);
vhost_zerocopy_signal_used(n, vq);
mutex_unlock(&vq->mutex);
@@ -952,7 +973,7 @@ err_used:
rcu_assign_pointer(vq->private_data, oldsock);
vhost_net_enable_vq(n, vq);
if (ubufs)
- vhost_ubuf_put_and_wait(ubufs);
+ vhost_net_ubuf_put_and_wait(ubufs);
err_ubufs:
fput(sock->file);
err_vq:
@@ -1027,6 +1048,23 @@ static int vhost_net_set_features(struct vhost_net *n, u64 features)
return 0;
}
+static long vhost_net_set_owner(struct vhost_net *n)
+{
+ int r;
+
+ mutex_lock(&n->dev.mutex);
+ r = vhost_net_set_ubuf_info(n);
+ if (r)
+ goto out;
+ r = vhost_dev_set_owner(&n->dev);
+ if (r)
+ vhost_net_clear_ubuf_info(n);
+ vhost_net_flush(n);
+out:
+ mutex_unlock(&n->dev.mutex);
+ return r;
+}
+
static long vhost_net_ioctl(struct file *f, unsigned int ioctl,
unsigned long arg)
{
@@ -1055,19 +1093,15 @@ static long vhost_net_ioctl(struct file *f, unsigned int ioctl,
return vhost_net_set_features(n, features);
case VHOST_RESET_OWNER:
return vhost_net_reset_owner(n);
+ case VHOST_SET_OWNER:
+ return vhost_net_set_owner(n);
default:
mutex_lock(&n->dev.mutex);
- if (ioctl == VHOST_SET_OWNER) {
- r = vhost_net_set_ubuf_info(n);
- if (r)
- goto out;
- }
r = vhost_dev_ioctl(&n->dev, ioctl, argp);
if (r == -ENOIOCTLCMD)
r = vhost_vring_ioctl(&n->dev, ioctl, argp);
else
vhost_net_flush(n);
-out:
mutex_unlock(&n->dev.mutex);
return r;
}
@@ -1101,7 +1135,7 @@ static struct miscdevice vhost_net_misc = {
static int vhost_net_init(void)
{
if (experimental_zcopytx)
- vhost_enable_zcopy(VHOST_NET_VQ_TX);
+ vhost_net_enable_zcopy(VHOST_NET_VQ_TX);
return misc_register(&vhost_net_misc);
}
module_init(vhost_net_init);
diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c
index 5179f7aa1b0..70142029722 100644
--- a/drivers/vhost/scsi.c
+++ b/drivers/vhost/scsi.c
@@ -162,14 +162,8 @@ enum {
VHOST_SCSI_VQ_IO = 2,
};
-/*
- * VIRTIO_RING_F_EVENT_IDX seems broken. Not sure the bug is in
- * kernel but disabling it helps.
- * TODO: debug and remove the workaround.
- */
enum {
- VHOST_SCSI_FEATURES = (VHOST_FEATURES & (~VIRTIO_RING_F_EVENT_IDX)) |
- (1ULL << VIRTIO_SCSI_F_HOTPLUG)
+ VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG)
};
#define VHOST_SCSI_MAX_TARGET 256
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 749b5ab5bfb..beee7f5787e 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -13,7 +13,7 @@
#include <linux/eventfd.h>
#include <linux/vhost.h>
-#include <linux/virtio_net.h>
+#include <linux/socket.h> /* memcpy_fromiovec */
#include <linux/mm.h>
#include <linux/mmu_context.h>
#include <linux/miscdevice.h>
@@ -344,7 +344,7 @@ static int vhost_attach_cgroups(struct vhost_dev *dev)
}
/* Caller should have device mutex */
-static long vhost_dev_set_owner(struct vhost_dev *dev)
+long vhost_dev_set_owner(struct vhost_dev *dev)
{
struct task_struct *worker;
int err;
diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
index b58f4ae82cb..a7ad6359298 100644
--- a/drivers/vhost/vhost.h
+++ b/drivers/vhost/vhost.h
@@ -99,9 +99,6 @@ struct vhost_virtqueue {
u64 log_addr;
struct iovec iov[UIO_MAXIOV];
- /* 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 *indirect;
struct vring_used_elem *heads;
/* We use a kind of RCU to access private pointer.
@@ -135,6 +132,7 @@ struct vhost_dev {
};
long vhost_dev_init(struct vhost_dev *, struct vhost_virtqueue **vqs, int nvqs);
+long vhost_dev_set_owner(struct vhost_dev *dev);
long vhost_dev_check_owner(struct vhost_dev *);
struct vhost_memory *vhost_dev_reset_owner_prepare(void);
void vhost_dev_reset_owner(struct vhost_dev *, struct vhost_memory *);
@@ -177,9 +175,6 @@ enum {
(1ULL << VIRTIO_RING_F_INDIRECT_DESC) |
(1ULL << VIRTIO_RING_F_EVENT_IDX) |
(1ULL << VHOST_F_LOG_ALL),
- VHOST_NET_FEATURES = VHOST_FEATURES |
- (1ULL << VHOST_NET_F_VIRTIO_NET_HDR) |
- (1ULL << VIRTIO_NET_F_MRG_RXBUF),
};
static inline int vhost_has_feature(struct vhost_dev *dev, int bit)
@@ -191,7 +186,4 @@ static inline int vhost_has_feature(struct vhost_dev *dev, int bit)
acked_features = rcu_dereference_index_check(dev->acked_features, 1);
return acked_features & (1 << bit);
}
-
-void vhost_enable_zcopy(int vq);
-
#endif
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-23 11:35:17 +0000