On Tue, May 07, 2013 at 02:22:32PM +0300, Michael S. Tsirkin wrote:
> On Tue, May 07, 2013 at 02:52:45PM +0800, Asias He wrote:
> > Fix it by:
> > 1) switching to use the new device specific fields per vq
> > 2) not including vhost.c, instead make vhost-test.ko depend on vhost.ko.
>
> Please split this up.
> 1. make test work for 3.10
> 2. make test work for 3.11
>
> thanks!
okay.
> > ---
> > drivers/vhost/test.c | 37 +++++++++++++++++++++++++------------
> > 1 file changed, 25 insertions(+), 12 deletions(-)
> >
> > diff --git a/drivers/vhost/test.c b/drivers/vhost/test.c
> > index 1ee45bc..dc526eb 100644
> > --- a/drivers/vhost/test.c
> > +++ b/drivers/vhost/test.c
> > @@ -18,7 +18,7 @@
> > #include <linux/slab.h>
> >
> > #include "test.h"
> > -#include "vhost.c"
> > +#include "vhost.h"
> >
> > /* Max number of bytes transferred before requeueing the job.
> > * Using this limit prevents one virtqueue from starving others. */
> > @@ -29,16 +29,20 @@ enum {
> > VHOST_TEST_VQ_MAX = 1,
> > };
> >
> > +struct vhost_test_virtqueue {
> > + struct vhost_virtqueue vq;
> > +};
> > +
>
> This isn't needed or useful. Drop above change pls and patch
> size will shrink.
The difference is:
drivers/vhost/test.c | 23 ++++++++++++++++-------
1 file changed, 16 insertions(+), 7 deletions(-)
drivers/vhost/test.c | 35 ++++++++++++++++++++++++-----------
1 file changed, 24 insertions(+), 11 deletions(-)
which is not significant.
So, I think it is better to code the same way as we do in vhost-net and
vhost-scsi which makes the device specific usage more consistent.
> > struct vhost_test {
> > struct vhost_dev dev;
> > - struct vhost_virtqueue vqs[VHOST_TEST_VQ_MAX];
> > + struct vhost_test_virtqueue vqs[VHOST_TEST_VQ_MAX];
> > };
> >
> > /* Expects to be always run from workqueue - which acts as
> > * read-size critical section for our kind of RCU. */
> > static void handle_vq(struct vhost_test *n)
> > {
> > - struct vhost_virtqueue *vq = &n->dev.vqs[VHOST_TEST_VQ];
> > + struct vhost_virtqueue *vq = n->dev.vqs[VHOST_TEST_VQ];
> > unsigned out, in;
> > int head;
> > size_t len, total_len = 0;
> > @@ -101,15 +105,23 @@ static void handle_vq_kick(struct vhost_work *work)
> > static int vhost_test_open(struct inode *inode, struct file *f)
> > {
> > struct vhost_test *n = kmalloc(sizeof *n, GFP_KERNEL);
> > + struct vhost_virtqueue **vqs;
> > struct vhost_dev *dev;
> > int r;
> >
> > if (!n)
> > return -ENOMEM;
> >
> > + vqs = kmalloc(VHOST_TEST_VQ_MAX * sizeof(*vqs), GFP_KERNEL);
> > + if (!vqs) {
> > + kfree(n);
> > + return -ENOMEM;
> > + }
> > +
> > dev = &n->dev;
> > - n->vqs[VHOST_TEST_VQ].handle_kick = handle_vq_kick;
> > - r = vhost_dev_init(dev, n->vqs, VHOST_TEST_VQ_MAX);
> > + vqs[VHOST_TEST_VQ] = &n->vqs[VHOST_TEST_VQ].vq;
> > + n->vqs[VHOST_TEST_VQ].vq.handle_kick = handle_vq_kick;
> > + r = vhost_dev_init(dev, vqs, VHOST_TEST_VQ_MAX);
> > if (r < 0) {
> > kfree(n);
> > return r;
> > @@ -135,12 +147,12 @@ static void *vhost_test_stop_vq(struct vhost_test *n,
> >
> > static void vhost_test_stop(struct vhost_test *n, void **privatep)
> > {
> > - *privatep = vhost_test_stop_vq(n, n->vqs + VHOST_TEST_VQ);
> > + *privatep = vhost_test_stop_vq(n, &n->vqs[VHOST_TEST_VQ].vq);
> > }
> >
> > static void vhost_test_flush_vq(struct vhost_test *n, int index)
> > {
> > - vhost_poll_flush(&n->dev.vqs[index].poll);
> > + vhost_poll_flush(&n->vqs[index].vq.poll);
> > }
> >
> > static void vhost_test_flush(struct vhost_test *n)
> > @@ -159,6 +171,7 @@ static int vhost_test_release(struct inode *inode,
> > struct file *f)
> > /* We do an extra flush before freeing memory,
> > * since jobs can re-queue themselves. */
> > vhost_test_flush(n);
> > + kfree(n->dev.vqs);
> > kfree(n);
> > return 0;
> > }
> > @@ -179,14 +192,14 @@ static long vhost_test_run(struct vhost_test *n, int
> > test)
> >
> > for (index = 0; index < n->dev.nvqs; ++index) {
> > /* Verify that ring has been setup correctly. */
> > - if (!vhost_vq_access_ok(&n->vqs[index])) {
> > + if (!vhost_vq_access_ok(&n->vqs[index].vq)) {
> > r = -EFAULT;
> > goto err;
> > }
> > }
> >
> > for (index = 0; index < n->dev.nvqs; ++index) {
> > - vq = n->vqs + index;
> > + vq = &n->vqs[index].vq;
> > mutex_lock(&vq->mutex);
> > priv = test ? n : NULL;
> >
> > @@ -195,7 +208,7 @@ static long vhost_test_run(struct vhost_test *n, int
> > test)
> >
> > lockdep_is_held(&vq->mutex));
> > rcu_assign_pointer(vq->private_data, priv);
> >
> > - r = vhost_init_used(&n->vqs[index]);
> > + r = vhost_init_used(&n->vqs[index].vq);
> >
> > mutex_unlock(&vq->mutex);
> >
> > @@ -268,14 +281,14 @@ static long vhost_test_ioctl(struct file *f, unsigned
> > int ioctl,
> > return -EFAULT;
> > return vhost_test_run(n, test);
> > case VHOST_GET_FEATURES:
> > - features = VHOST_NET_FEATURES;
> > + features = VHOST_FEATURES;
> > if (copy_to_user(featurep, &features, sizeof features))
> > return -EFAULT;
> > return 0;
> > case VHOST_SET_FEATURES:
> > if (copy_from_user(&features, featurep, sizeof features))
> > return -EFAULT;
> > - if (features & ~VHOST_NET_FEATURES)
> > + if (features & ~VHOST_FEATURES)
> > return -EOPNOTSUPP;
> > return vhost_test_set_features(n, features);
> > case VHOST_RESET_OWNER:
> > --
> > 1.8.1.4
--
Asias
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