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Merge tag 'virtio-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux

Browse Source 
Pull virtio update from Rusty Russell:
 "Some nice cleanups, and even a patch my wife did as a "live" demo for
  Latinoware 2012.

  There's a slightly non-trivial merge in virtio-net, as we cleaned up
  the virtio add_buf interface while DaveM accepted the mq virtio-net
  patches."

* tag 'virtio-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux: (27 commits)
  virtio_console: Add support for remoteproc serial
  virtio_console: Merge struct buffer_token into struct port_buffer
  virtio: add drv_to_virtio to make code clearly
  virtio: use dev_to_virtio wrapper in virtio
  virtio-mmio: Fix irq parsing in command line parameter
  virtio_console: Free buffers from out-queue upon close
  virtio: Convert dev_printk(KERN_<LEVEL> to dev_<level>(
  virtio_console: Use kmalloc instead of kzalloc
  virtio_console: Free buffer if splice fails
  virtio: tools: make it clear that virtqueue_add_buf() no longer returns > 0
  virtio: scsi: make it clear that virtqueue_add_buf() no longer returns > 0
  virtio: rpmsg: make it clear that virtqueue_add_buf() no longer returns > 0
  virtio: net: make it clear that virtqueue_add_buf() no longer returns > 0
  virtio: console: make it clear that virtqueue_add_buf() no longer returns > 0
  virtio: make virtqueue_add_buf() returning 0 on success, not capacity.
  virtio: console: don't rely on virtqueue_add_buf() returning capacity.
  virtio_net: don't rely on virtqueue_add_buf() returning capacity.
  virtio-net: remove unused skb_vnet_hdr->num_sg field
  virtio-net: correct capacity math on ring full
  virtio: move queue_index and num_free fields into core struct virtqueue.
  ...
This commit is contained in:
Linus Torvalds
2012-12-20 08:37:04 -08:00
parent 03c850ec32 1b6370463e
commit b7dfde956d
17 changed files with 411 additions and 275 deletions
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84
tools/lguest/lguest.c
View File

@@ -179,29 +179,6 @@ static struct termios orig_term;
#define wmb() __asm__ __volatile__("" : : : "memory")
#define mb() __asm__ __volatile__("" : : : "memory")
/*
* Convert an iovec element to the given type.
*
* This is a fairly ugly trick: we need to know the size of the type and
* alignment requirement to check the pointer is kosher. It's also nice to
* have the name of the type in case we report failure.
*
* Typing those three things all the time is cumbersome and error prone, so we
* have a macro which sets them all up and passes to the real function.
*/
#define convert(iov, type) \
((type *)_convert((iov), sizeof(type), __alignof__(type), #type))
static void *_convert(struct iovec *iov, size_t size, size_t align,
const char *name)
{
if (iov->iov_len != size)
errx(1, "Bad iovec size %zu for %s", iov->iov_len, name);
if ((unsigned long)iov->iov_base % align != 0)
errx(1, "Bad alignment %p for %s", iov->iov_base, name);
return iov->iov_base;
}
/* Wrapper for the last available index. Makes it easier to change. */
#define lg_last_avail(vq) ((vq)->last_avail_idx)
@@ -228,7 +205,8 @@ static bool iov_empty(const struct iovec iov[], unsigned int num_iov)
}
/* Take len bytes from the front of this iovec. */
static void iov_consume(struct iovec iov[], unsigned num_iov, unsigned len)
static void iov_consume(struct iovec iov[], unsigned num_iov,
void *dest, unsigned len)
{
unsigned int i;
@@ -236,11 +214,16 @@ static void iov_consume(struct iovec iov[], unsigned num_iov, unsigned len)
unsigned int used;
used = iov[i].iov_len < len ? iov[i].iov_len : len;
if (dest) {
memcpy(dest, iov[i].iov_base, used);
dest += used;
}
iov[i].iov_base += used;
iov[i].iov_len -= used;
len -= used;
}
assert(len == 0);
if (len != 0)
errx(1, "iovec too short!");
}
/* The device virtqueue descriptors are followed by feature bitmasks. */
@@ -864,7 +847,7 @@ static void console_output(struct virtqueue *vq)
warn("Write to stdout gave %i (%d)", len, errno);
break;
}
iov_consume(iov, out, len);
iov_consume(iov, out, NULL, len);
}
/*
@@ -1591,9 +1574,9 @@ static void blk_request(struct virtqueue *vq)
{
struct vblk_info *vblk = vq->dev->priv;
unsigned int head, out_num, in_num, wlen;
int ret;
int ret, i;
u8 *in;
struct virtio_blk_outhdr *out;
struct virtio_blk_outhdr out;
struct iovec iov[vq->vring.num];
off64_t off;
@@ -1603,32 +1586,36 @@ static void blk_request(struct virtqueue *vq)
*/
head = wait_for_vq_desc(vq, iov, &out_num, &in_num);
/*
* Every block request should contain at least one output buffer
* (detailing the location on disk and the type of request) and one
* input buffer (to hold the result).
*/
if (out_num == 0 || in_num == 0)
errx(1, "Bad virtblk cmd %u out=%u in=%u",
head, out_num, in_num);
/* Copy the output header from the front of the iov (adjusts iov) */
iov_consume(iov, out_num, &out, sizeof(out));
/* Find and trim end of iov input array, for our status byte. */
in = NULL;
for (i = out_num + in_num - 1; i >= out_num; i--) {
if (iov[i].iov_len > 0) {
in = iov[i].iov_base + iov[i].iov_len - 1;
iov[i].iov_len--;
break;
}
}
if (!in)
errx(1, "Bad virtblk cmd with no room for status");
out = convert(&iov[0], struct virtio_blk_outhdr);
in = convert(&iov[out_num+in_num-1], u8);
/*
* For historical reasons, block operations are expressed in 512 byte
* "sectors".
*/
off = out->sector * 512;
off = out.sector * 512;
/*
* In general the virtio block driver is allowed to try SCSI commands.
* It'd be nice if we supported eject, for example, but we don't.
*/
if (out->type & VIRTIO_BLK_T_SCSI_CMD) {
if (out.type & VIRTIO_BLK_T_SCSI_CMD) {
fprintf(stderr, "Scsi commands unsupported\n");
*in = VIRTIO_BLK_S_UNSUPP;
wlen = sizeof(*in);
} else if (out->type & VIRTIO_BLK_T_OUT) {
} else if (out.type & VIRTIO_BLK_T_OUT) {
/*
* Write
*
@@ -1636,10 +1623,10 @@ static void blk_request(struct virtqueue *vq)
* if they try to write past end.
*/
if (lseek64(vblk->fd, off, SEEK_SET) != off)
err(1, "Bad seek to sector %llu", out->sector);
err(1, "Bad seek to sector %llu", out.sector);
ret = writev(vblk->fd, iov+1, out_num-1);
verbose("WRITE to sector %llu: %i\n", out->sector, ret);
ret = writev(vblk->fd, iov, out_num);
verbose("WRITE to sector %llu: %i\n", out.sector, ret);
/*
* Grr... Now we know how long the descriptor they sent was, we
@@ -1655,7 +1642,7 @@ static void blk_request(struct virtqueue *vq)
wlen = sizeof(*in);
*in = (ret >= 0 ? VIRTIO_BLK_S_OK : VIRTIO_BLK_S_IOERR);
} else if (out->type & VIRTIO_BLK_T_FLUSH) {
} else if (out.type & VIRTIO_BLK_T_FLUSH) {
/* Flush */
ret = fdatasync(vblk->fd);
verbose("FLUSH fdatasync: %i\n", ret);
@@ -1669,10 +1656,9 @@ static void blk_request(struct virtqueue *vq)
* if they try to read past end.
*/
if (lseek64(vblk->fd, off, SEEK_SET) != off)
err(1, "Bad seek to sector %llu", out->sector);
err(1, "Bad seek to sector %llu", out.sector);
ret = readv(vblk->fd, iov+1, in_num-1);
verbose("READ from sector %llu: %i\n", out->sector, ret);
ret = readv(vblk->fd, iov + out_num, in_num);
if (ret >= 0) {
wlen = sizeof(*in) + ret;
*in = VIRTIO_BLK_S_OK;
@@ -1758,7 +1744,7 @@ static void rng_input(struct virtqueue *vq)
len = readv(rng_info->rfd, iov, in_num);
if (len <= 0)
err(1, "Read from /dev/random gave %i", len);
iov_consume(iov, in_num, len);
iov_consume(iov, in_num, NULL, len);
totlen += len;
}

4
tools/virtio/virtio_test.c
View File

@@ -164,7 +164,7 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq,
r = virtqueue_add_buf(vq->vq, &sl, 1, 0,
dev->buf + started,
GFP_ATOMIC);
if (likely(r >= 0)) {
if (likely(r == 0)) {
++started;
virtqueue_kick(vq->vq);
}
@@ -177,7 +177,7 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq,
r = 0;
}
} while (r >= 0);
} while (r == 0);
if (completed == completed_before)
++spurious;
assert(completed <= bufs);