提交 b6d04864 编写于 作者: D David S. Miller

Merge branch 'vhost-net-next' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

vhost changes for 3.8 from Michael S. Tsirkin
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
......@@ -30,9 +30,10 @@
#include "vhost.h"
static int experimental_zcopytx;
static int experimental_zcopytx = 1;
module_param(experimental_zcopytx, int, 0444);
MODULE_PARM_DESC(experimental_zcopytx, "Enable Experimental Zero Copy TX");
MODULE_PARM_DESC(experimental_zcopytx, "Enable Zero Copy TX;"
" 1 -Enable; 0 - Disable");
/* Max number of bytes transferred before requeueing the job.
* Using this limit prevents one virtqueue from starving others. */
......@@ -83,6 +84,8 @@ struct vhost_net {
/* Number of times zerocopy TX recently failed.
* Protected by tx vq lock. */
unsigned tx_zcopy_err;
/* Flush in progress. Protected by tx vq lock. */
bool tx_flush;
};
static void vhost_net_tx_packet(struct vhost_net *net)
......@@ -101,7 +104,11 @@ static void vhost_net_tx_err(struct vhost_net *net)
static bool vhost_net_tx_select_zcopy(struct vhost_net *net)
{
return net->tx_packets / 64 >= net->tx_zcopy_err;
/* TX flush waits for outstanding DMAs to be done.
* Don't start new DMAs.
*/
return !net->tx_flush &&
net->tx_packets / 64 >= net->tx_zcopy_err;
}
static bool vhost_sock_zcopy(struct socket *sock)
......@@ -235,7 +242,7 @@ static void handle_tx(struct vhost_net *net)
size_t hdr_size;
struct socket *sock;
struct vhost_ubuf_ref *uninitialized_var(ubufs);
bool zcopy;
bool zcopy, zcopy_used;
/* TODO: check that we are running from vhost_worker? */
sock = rcu_dereference_check(vq->private_data, 1);
......@@ -313,8 +320,11 @@ static void handle_tx(struct vhost_net *net)
iov_length(vq->hdr, s), hdr_size);
break;
}
zcopy_used = zcopy && (len >= VHOST_GOODCOPY_LEN ||
vq->upend_idx != vq->done_idx);
/* use msg_control to pass vhost zerocopy ubuf info to skb */
if (zcopy) {
if (zcopy_used) {
vq->heads[vq->upend_idx].id = head;
if (!vhost_net_tx_select_zcopy(net) ||
len < VHOST_GOODCOPY_LEN) {
......@@ -342,7 +352,7 @@ static void handle_tx(struct vhost_net *net)
/* TODO: Check specific error and bomb out unless ENOBUFS? */
err = sock->ops->sendmsg(NULL, sock, &msg, len);
if (unlikely(err < 0)) {
if (zcopy) {
if (zcopy_used) {
if (ubufs)
vhost_ubuf_put(ubufs);
vq->upend_idx = ((unsigned)vq->upend_idx - 1) %
......@@ -356,7 +366,7 @@ static void handle_tx(struct vhost_net *net)
if (err != len)
pr_debug("Truncated TX packet: "
" len %d != %zd\n", err, len);
if (!zcopy)
if (!zcopy_used)
vhost_add_used_and_signal(&net->dev, vq, head, 0);
else
vhost_zerocopy_signal_used(net, vq);
......@@ -679,6 +689,17 @@ static void vhost_net_flush(struct vhost_net *n)
{
vhost_net_flush_vq(n, VHOST_NET_VQ_TX);
vhost_net_flush_vq(n, VHOST_NET_VQ_RX);
if (n->dev.vqs[VHOST_NET_VQ_TX].ubufs) {
mutex_lock(&n->dev.vqs[VHOST_NET_VQ_TX].mutex);
n->tx_flush = true;
mutex_unlock(&n->dev.vqs[VHOST_NET_VQ_TX].mutex);
/* Wait for all lower device DMAs done. */
vhost_ubuf_put_and_wait(n->dev.vqs[VHOST_NET_VQ_TX].ubufs);
mutex_lock(&n->dev.vqs[VHOST_NET_VQ_TX].mutex);
n->tx_flush = false;
kref_init(&n->dev.vqs[VHOST_NET_VQ_TX].ubufs->kref);
mutex_unlock(&n->dev.vqs[VHOST_NET_VQ_TX].mutex);
}
}
static int vhost_net_release(struct inode *inode, struct file *f)
......@@ -686,18 +707,10 @@ static int vhost_net_release(struct inode *inode, struct file *f)
struct vhost_net *n = f->private_data;
struct socket *tx_sock;
struct socket *rx_sock;
int i;
vhost_net_stop(n, &tx_sock, &rx_sock);
vhost_net_flush(n);
vhost_dev_stop(&n->dev);
for (i = 0; i < n->dev.nvqs; ++i) {
/* Wait for all lower device DMAs done. */
if (n->dev.vqs[i].ubufs)
vhost_ubuf_put_and_wait(n->dev.vqs[i].ubufs);
vhost_zerocopy_signal_used(n, &n->dev.vqs[i]);
}
vhost_dev_cleanup(&n->dev, false);
if (tx_sock)
fput(tx_sock->file);
......@@ -826,6 +839,7 @@ static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd)
n->tx_packets = 0;
n->tx_zcopy_err = 0;
n->tx_flush = false;
}
mutex_unlock(&vq->mutex);
......@@ -942,8 +956,11 @@ static long vhost_net_ioctl(struct file *f, unsigned int ioctl,
return vhost_net_reset_owner(n);
default:
mutex_lock(&n->dev.mutex);
r = vhost_dev_ioctl(&n->dev, ioctl, arg);
vhost_net_flush(n);
r = vhost_dev_ioctl(&n->dev, ioctl, argp);
if (r == -ENOIOCTLCMD)
r = vhost_vring_ioctl(&n->dev, ioctl, argp);
else
vhost_net_flush(n);
mutex_unlock(&n->dev.mutex);
return r;
}
......
......@@ -414,14 +414,12 @@ static struct tcm_vhost_cmd *vhost_scsi_allocate_cmd(
{
struct tcm_vhost_cmd *tv_cmd;
struct tcm_vhost_nexus *tv_nexus;
struct se_session *se_sess;
tv_nexus = tv_tpg->tpg_nexus;
if (!tv_nexus) {
pr_err("Unable to locate active struct tcm_vhost_nexus\n");
return ERR_PTR(-EIO);
}
se_sess = tv_nexus->tvn_se_sess;
tv_cmd = kzalloc(sizeof(struct tcm_vhost_cmd), GFP_ATOMIC);
if (!tv_cmd) {
......@@ -970,7 +968,10 @@ static long vhost_scsi_ioctl(struct file *f, unsigned int ioctl,
return vhost_scsi_set_features(vs, features);
default:
mutex_lock(&vs->dev.mutex);
r = vhost_dev_ioctl(&vs->dev, ioctl, arg);
r = vhost_dev_ioctl(&vs->dev, ioctl, argp);
/* TODO: flush backend after dev ioctl. */
if (r == -ENOIOCTLCMD)
r = vhost_vring_ioctl(&vs->dev, ioctl, argp);
mutex_unlock(&vs->dev.mutex);
return r;
}
......
......@@ -607,7 +607,7 @@ static long vhost_set_memory(struct vhost_dev *d, struct vhost_memory __user *m)
return 0;
}
static long vhost_set_vring(struct vhost_dev *d, int ioctl, void __user *argp)
long vhost_vring_ioctl(struct vhost_dev *d, int ioctl, void __user *argp)
{
struct file *eventfp, *filep = NULL;
bool pollstart = false, pollstop = false;
......@@ -802,9 +802,8 @@ static long vhost_set_vring(struct vhost_dev *d, int ioctl, void __user *argp)
}
/* Caller must have device mutex */
long vhost_dev_ioctl(struct vhost_dev *d, unsigned int ioctl, unsigned long arg)
long vhost_dev_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *argp)
{
void __user *argp = (void __user *)arg;
struct file *eventfp, *filep = NULL;
struct eventfd_ctx *ctx = NULL;
u64 p;
......@@ -875,7 +874,7 @@ long vhost_dev_ioctl(struct vhost_dev *d, unsigned int ioctl, unsigned long arg)
fput(filep);
break;
default:
r = vhost_set_vring(d, ioctl, argp);
r = -ENOIOCTLCMD;
break;
}
done:
......
......@@ -164,7 +164,8 @@ long vhost_dev_check_owner(struct vhost_dev *);
long vhost_dev_reset_owner(struct vhost_dev *);
void vhost_dev_cleanup(struct vhost_dev *, bool locked);
void vhost_dev_stop(struct vhost_dev *);
long vhost_dev_ioctl(struct vhost_dev *, unsigned int ioctl, unsigned long arg);
long vhost_dev_ioctl(struct vhost_dev *, unsigned int ioctl, void __user *argp);
long vhost_vring_ioctl(struct vhost_dev *d, int ioctl, void __user *argp);
int vhost_vq_access_ok(struct vhost_virtqueue *vq);
int vhost_log_access_ok(struct vhost_dev *);
......
......@@ -232,7 +232,7 @@ const struct option longopts[] = {
}
};
static void help()
static void help(void)
{
fprintf(stderr, "Usage: virtio_test [--help]"
" [--no-indirect]"
......
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