On Wed, May 08, 2013 at 03:14:58PM +0800, Asias He wrote:
> 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.
I did it like this:
test.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
> 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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