linux/tools/virtio/vringh_test.c
Greg Kroah-Hartman b24413180f License cleanup: add SPDX GPL-2.0 license identifier to files with no license
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.

By default all files without license information are under the default
license of the kernel, which is GPL version 2.

Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier.  The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.

This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.

How this work was done:

Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
 - file had no licensing information it it.
 - file was a */uapi/* one with no licensing information in it,
 - file was a */uapi/* one with existing licensing information,

Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.

The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne.  Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.

The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed.  Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.

Criteria used to select files for SPDX license identifier tagging was:
 - Files considered eligible had to be source code files.
 - Make and config files were included as candidates if they contained >5
   lines of source
 - File already had some variant of a license header in it (even if <5
   lines).

All documentation files were explicitly excluded.

The following heuristics were used to determine which SPDX license
identifiers to apply.

 - when both scanners couldn't find any license traces, file was
   considered to have no license information in it, and the top level
   COPYING file license applied.

   For non */uapi/* files that summary was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0                                              11139

   and resulted in the first patch in this series.

   If that file was a */uapi/* path one, it was "GPL-2.0 WITH
   Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0 WITH Linux-syscall-note                        930

   and resulted in the second patch in this series.

 - if a file had some form of licensing information in it, and was one
   of the */uapi/* ones, it was denoted with the Linux-syscall-note if
   any GPL family license was found in the file or had no licensing in
   it (per prior point).  Results summary:

   SPDX license identifier                            # files
   ---------------------------------------------------|------
   GPL-2.0 WITH Linux-syscall-note                       270
   GPL-2.0+ WITH Linux-syscall-note                      169
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
   LGPL-2.1+ WITH Linux-syscall-note                      15
   GPL-1.0+ WITH Linux-syscall-note                       14
   ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
   LGPL-2.0+ WITH Linux-syscall-note                       4
   LGPL-2.1 WITH Linux-syscall-note                        3
   ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
   ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1

   and that resulted in the third patch in this series.

 - when the two scanners agreed on the detected license(s), that became
   the concluded license(s).

 - when there was disagreement between the two scanners (one detected a
   license but the other didn't, or they both detected different
   licenses) a manual inspection of the file occurred.

 - In most cases a manual inspection of the information in the file
   resulted in a clear resolution of the license that should apply (and
   which scanner probably needed to revisit its heuristics).

 - When it was not immediately clear, the license identifier was
   confirmed with lawyers working with the Linux Foundation.

 - If there was any question as to the appropriate license identifier,
   the file was flagged for further research and to be revisited later
   in time.

In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.

Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights.  The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.

Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.

In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.

Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
 - a full scancode scan run, collecting the matched texts, detected
   license ids and scores
 - reviewing anything where there was a license detected (about 500+
   files) to ensure that the applied SPDX license was correct
 - reviewing anything where there was no detection but the patch license
   was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
   SPDX license was correct

This produced a worksheet with 20 files needing minor correction.  This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.

These .csv files were then reviewed by Greg.  Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected.  This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.)  Finally Greg ran the script using the .csv files to
generate the patches.

Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-02 11:10:55 +01:00

752 lines
20 KiB
C

// SPDX-License-Identifier: GPL-2.0
/* Simple test of virtio code, entirely in userpsace. */
#define _GNU_SOURCE
#include <sched.h>
#include <err.h>
#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/virtio.h>
#include <linux/vringh.h>
#include <linux/virtio_ring.h>
#include <linux/virtio_config.h>
#include <linux/uaccess.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/wait.h>
#include <fcntl.h>
#define USER_MEM (1024*1024)
void *__user_addr_min, *__user_addr_max;
void *__kmalloc_fake, *__kfree_ignore_start, *__kfree_ignore_end;
static u64 user_addr_offset;
#define RINGSIZE 256
#define ALIGN 4096
static bool never_notify_host(struct virtqueue *vq)
{
abort();
}
static void never_callback_guest(struct virtqueue *vq)
{
abort();
}
static bool getrange_iov(struct vringh *vrh, u64 addr, struct vringh_range *r)
{
if (addr < (u64)(unsigned long)__user_addr_min - user_addr_offset)
return false;
if (addr >= (u64)(unsigned long)__user_addr_max - user_addr_offset)
return false;
r->start = (u64)(unsigned long)__user_addr_min - user_addr_offset;
r->end_incl = (u64)(unsigned long)__user_addr_max - 1 - user_addr_offset;
r->offset = user_addr_offset;
return true;
}
/* We return single byte ranges. */
static bool getrange_slow(struct vringh *vrh, u64 addr, struct vringh_range *r)
{
if (addr < (u64)(unsigned long)__user_addr_min - user_addr_offset)
return false;
if (addr >= (u64)(unsigned long)__user_addr_max - user_addr_offset)
return false;
r->start = addr;
r->end_incl = r->start;
r->offset = user_addr_offset;
return true;
}
struct guest_virtio_device {
struct virtio_device vdev;
int to_host_fd;
unsigned long notifies;
};
static bool parallel_notify_host(struct virtqueue *vq)
{
int rc;
struct guest_virtio_device *gvdev;
gvdev = container_of(vq->vdev, struct guest_virtio_device, vdev);
rc = write(gvdev->to_host_fd, "", 1);
if (rc < 0)
return false;
gvdev->notifies++;
return true;
}
static bool no_notify_host(struct virtqueue *vq)
{
return true;
}
#define NUM_XFERS (10000000)
/* We aim for two "distant" cpus. */
static void find_cpus(unsigned int *first, unsigned int *last)
{
unsigned int i;
*first = -1U;
*last = 0;
for (i = 0; i < 4096; i++) {
cpu_set_t set;
CPU_ZERO(&set);
CPU_SET(i, &set);
if (sched_setaffinity(getpid(), sizeof(set), &set) == 0) {
if (i < *first)
*first = i;
if (i > *last)
*last = i;
}
}
}
/* Opencoded version for fast mode */
static inline int vringh_get_head(struct vringh *vrh, u16 *head)
{
u16 avail_idx, i;
int err;
err = get_user(avail_idx, &vrh->vring.avail->idx);
if (err)
return err;
if (vrh->last_avail_idx == avail_idx)
return 0;
/* Only get avail ring entries after they have been exposed by guest. */
virtio_rmb(vrh->weak_barriers);
i = vrh->last_avail_idx & (vrh->vring.num - 1);
err = get_user(*head, &vrh->vring.avail->ring[i]);
if (err)
return err;
vrh->last_avail_idx++;
return 1;
}
static int parallel_test(u64 features,
bool (*getrange)(struct vringh *vrh,
u64 addr, struct vringh_range *r),
bool fast_vringh)
{
void *host_map, *guest_map;
int fd, mapsize, to_guest[2], to_host[2];
unsigned long xfers = 0, notifies = 0, receives = 0;
unsigned int first_cpu, last_cpu;
cpu_set_t cpu_set;
char buf[128];
/* Create real file to mmap. */
fd = open("/tmp/vringh_test-file", O_RDWR|O_CREAT|O_TRUNC, 0600);
if (fd < 0)
err(1, "Opening /tmp/vringh_test-file");
/* Extra room at the end for some data, and indirects */
mapsize = vring_size(RINGSIZE, ALIGN)
+ RINGSIZE * 2 * sizeof(int)
+ RINGSIZE * 6 * sizeof(struct vring_desc);
mapsize = (mapsize + getpagesize() - 1) & ~(getpagesize() - 1);
ftruncate(fd, mapsize);
/* Parent and child use separate addresses, to check our mapping logic! */
host_map = mmap(NULL, mapsize, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
guest_map = mmap(NULL, mapsize, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
pipe(to_guest);
pipe(to_host);
CPU_ZERO(&cpu_set);
find_cpus(&first_cpu, &last_cpu);
printf("Using CPUS %u and %u\n", first_cpu, last_cpu);
fflush(stdout);
if (fork() != 0) {
struct vringh vrh;
int status, err, rlen = 0;
char rbuf[5];
/* We are the host: never access guest addresses! */
munmap(guest_map, mapsize);
__user_addr_min = host_map;
__user_addr_max = __user_addr_min + mapsize;
user_addr_offset = host_map - guest_map;
assert(user_addr_offset);
close(to_guest[0]);
close(to_host[1]);
vring_init(&vrh.vring, RINGSIZE, host_map, ALIGN);
vringh_init_user(&vrh, features, RINGSIZE, true,
vrh.vring.desc, vrh.vring.avail, vrh.vring.used);
CPU_SET(first_cpu, &cpu_set);
if (sched_setaffinity(getpid(), sizeof(cpu_set), &cpu_set))
errx(1, "Could not set affinity to cpu %u", first_cpu);
while (xfers < NUM_XFERS) {
struct iovec host_riov[2], host_wiov[2];
struct vringh_iov riov, wiov;
u16 head, written;
if (fast_vringh) {
for (;;) {
err = vringh_get_head(&vrh, &head);
if (err != 0)
break;
err = vringh_need_notify_user(&vrh);
if (err < 0)
errx(1, "vringh_need_notify_user: %i",
err);
if (err) {
write(to_guest[1], "", 1);
notifies++;
}
}
if (err != 1)
errx(1, "vringh_get_head");
written = 0;
goto complete;
} else {
vringh_iov_init(&riov,
host_riov,
ARRAY_SIZE(host_riov));
vringh_iov_init(&wiov,
host_wiov,
ARRAY_SIZE(host_wiov));
err = vringh_getdesc_user(&vrh, &riov, &wiov,
getrange, &head);
}
if (err == 0) {
err = vringh_need_notify_user(&vrh);
if (err < 0)
errx(1, "vringh_need_notify_user: %i",
err);
if (err) {
write(to_guest[1], "", 1);
notifies++;
}
if (!vringh_notify_enable_user(&vrh))
continue;
/* Swallow all notifies at once. */
if (read(to_host[0], buf, sizeof(buf)) < 1)
break;
vringh_notify_disable_user(&vrh);
receives++;
continue;
}
if (err != 1)
errx(1, "vringh_getdesc_user: %i", err);
/* We simply copy bytes. */
if (riov.used) {
rlen = vringh_iov_pull_user(&riov, rbuf,
sizeof(rbuf));
if (rlen != 4)
errx(1, "vringh_iov_pull_user: %i",
rlen);
assert(riov.i == riov.used);
written = 0;
} else {
err = vringh_iov_push_user(&wiov, rbuf, rlen);
if (err != rlen)
errx(1, "vringh_iov_push_user: %i",
err);
assert(wiov.i == wiov.used);
written = err;
}
complete:
xfers++;
err = vringh_complete_user(&vrh, head, written);
if (err != 0)
errx(1, "vringh_complete_user: %i", err);
}
err = vringh_need_notify_user(&vrh);
if (err < 0)
errx(1, "vringh_need_notify_user: %i", err);
if (err) {
write(to_guest[1], "", 1);
notifies++;
}
wait(&status);
if (!WIFEXITED(status))
errx(1, "Child died with signal %i?", WTERMSIG(status));
if (WEXITSTATUS(status) != 0)
errx(1, "Child exited %i?", WEXITSTATUS(status));
printf("Host: notified %lu, pinged %lu\n", notifies, receives);
return 0;
} else {
struct guest_virtio_device gvdev;
struct virtqueue *vq;
unsigned int *data;
struct vring_desc *indirects;
unsigned int finished = 0;
/* We pass sg[]s pointing into here, but we need RINGSIZE+1 */
data = guest_map + vring_size(RINGSIZE, ALIGN);
indirects = (void *)data + (RINGSIZE + 1) * 2 * sizeof(int);
/* We are the guest. */
munmap(host_map, mapsize);
close(to_guest[1]);
close(to_host[0]);
gvdev.vdev.features = features;
gvdev.to_host_fd = to_host[1];
gvdev.notifies = 0;
CPU_SET(first_cpu, &cpu_set);
if (sched_setaffinity(getpid(), sizeof(cpu_set), &cpu_set))
err(1, "Could not set affinity to cpu %u", first_cpu);
vq = vring_new_virtqueue(0, RINGSIZE, ALIGN, &gvdev.vdev, true,
false, guest_map,
fast_vringh ? no_notify_host
: parallel_notify_host,
never_callback_guest, "guest vq");
/* Don't kfree indirects. */
__kfree_ignore_start = indirects;
__kfree_ignore_end = indirects + RINGSIZE * 6;
while (xfers < NUM_XFERS) {
struct scatterlist sg[4];
unsigned int num_sg, len;
int *dbuf, err;
bool output = !(xfers % 2);
/* Consume bufs. */
while ((dbuf = virtqueue_get_buf(vq, &len)) != NULL) {
if (len == 4)
assert(*dbuf == finished - 1);
else if (!fast_vringh)
assert(*dbuf == finished);
finished++;
}
/* Produce a buffer. */
dbuf = data + (xfers % (RINGSIZE + 1));
if (output)
*dbuf = xfers;
else
*dbuf = -1;
switch ((xfers / sizeof(*dbuf)) % 4) {
case 0:
/* Nasty three-element sg list. */
sg_init_table(sg, num_sg = 3);
sg_set_buf(&sg[0], (void *)dbuf, 1);
sg_set_buf(&sg[1], (void *)dbuf + 1, 2);
sg_set_buf(&sg[2], (void *)dbuf + 3, 1);
break;
case 1:
sg_init_table(sg, num_sg = 2);
sg_set_buf(&sg[0], (void *)dbuf, 1);
sg_set_buf(&sg[1], (void *)dbuf + 1, 3);
break;
case 2:
sg_init_table(sg, num_sg = 1);
sg_set_buf(&sg[0], (void *)dbuf, 4);
break;
case 3:
sg_init_table(sg, num_sg = 4);
sg_set_buf(&sg[0], (void *)dbuf, 1);
sg_set_buf(&sg[1], (void *)dbuf + 1, 1);
sg_set_buf(&sg[2], (void *)dbuf + 2, 1);
sg_set_buf(&sg[3], (void *)dbuf + 3, 1);
break;
}
/* May allocate an indirect, so force it to allocate
* user addr */
__kmalloc_fake = indirects + (xfers % RINGSIZE) * 4;
if (output)
err = virtqueue_add_outbuf(vq, sg, num_sg, dbuf,
GFP_KERNEL);
else
err = virtqueue_add_inbuf(vq, sg, num_sg,
dbuf, GFP_KERNEL);
if (err == -ENOSPC) {
if (!virtqueue_enable_cb_delayed(vq))
continue;
/* Swallow all notifies at once. */
if (read(to_guest[0], buf, sizeof(buf)) < 1)
break;
receives++;
virtqueue_disable_cb(vq);
continue;
}
if (err)
errx(1, "virtqueue_add_in/outbuf: %i", err);
xfers++;
virtqueue_kick(vq);
}
/* Any extra? */
while (finished != xfers) {
int *dbuf;
unsigned int len;
/* Consume bufs. */
dbuf = virtqueue_get_buf(vq, &len);
if (dbuf) {
if (len == 4)
assert(*dbuf == finished - 1);
else
assert(len == 0);
finished++;
continue;
}
if (!virtqueue_enable_cb_delayed(vq))
continue;
if (read(to_guest[0], buf, sizeof(buf)) < 1)
break;
receives++;
virtqueue_disable_cb(vq);
}
printf("Guest: notified %lu, pinged %lu\n",
gvdev.notifies, receives);
vring_del_virtqueue(vq);
return 0;
}
}
int main(int argc, char *argv[])
{
struct virtio_device vdev;
struct virtqueue *vq;
struct vringh vrh;
struct scatterlist guest_sg[RINGSIZE], *sgs[2];
struct iovec host_riov[2], host_wiov[2];
struct vringh_iov riov, wiov;
struct vring_used_elem used[RINGSIZE];
char buf[28];
u16 head;
int err;
unsigned i;
void *ret;
bool (*getrange)(struct vringh *vrh, u64 addr, struct vringh_range *r);
bool fast_vringh = false, parallel = false;
getrange = getrange_iov;
vdev.features = 0;
while (argv[1]) {
if (strcmp(argv[1], "--indirect") == 0)
__virtio_set_bit(&vdev, VIRTIO_RING_F_INDIRECT_DESC);
else if (strcmp(argv[1], "--eventidx") == 0)
__virtio_set_bit(&vdev, VIRTIO_RING_F_EVENT_IDX);
else if (strcmp(argv[1], "--virtio-1") == 0)
__virtio_set_bit(&vdev, VIRTIO_F_VERSION_1);
else if (strcmp(argv[1], "--slow-range") == 0)
getrange = getrange_slow;
else if (strcmp(argv[1], "--fast-vringh") == 0)
fast_vringh = true;
else if (strcmp(argv[1], "--parallel") == 0)
parallel = true;
else
errx(1, "Unknown arg %s", argv[1]);
argv++;
}
if (parallel)
return parallel_test(vdev.features, getrange, fast_vringh);
if (posix_memalign(&__user_addr_min, PAGE_SIZE, USER_MEM) != 0)
abort();
__user_addr_max = __user_addr_min + USER_MEM;
memset(__user_addr_min, 0, vring_size(RINGSIZE, ALIGN));
/* Set up guest side. */
vq = vring_new_virtqueue(0, RINGSIZE, ALIGN, &vdev, true, false,
__user_addr_min,
never_notify_host, never_callback_guest,
"guest vq");
/* Set up host side. */
vring_init(&vrh.vring, RINGSIZE, __user_addr_min, ALIGN);
vringh_init_user(&vrh, vdev.features, RINGSIZE, true,
vrh.vring.desc, vrh.vring.avail, vrh.vring.used);
/* No descriptor to get yet... */
err = vringh_getdesc_user(&vrh, &riov, &wiov, getrange, &head);
if (err != 0)
errx(1, "vringh_getdesc_user: %i", err);
/* Guest puts in a descriptor. */
memcpy(__user_addr_max - 1, "a", 1);
sg_init_table(guest_sg, 1);
sg_set_buf(&guest_sg[0], __user_addr_max - 1, 1);
sg_init_table(guest_sg+1, 1);
sg_set_buf(&guest_sg[1], __user_addr_max - 3, 2);
sgs[0] = &guest_sg[0];
sgs[1] = &guest_sg[1];
/* May allocate an indirect, so force it to allocate user addr */
__kmalloc_fake = __user_addr_min + vring_size(RINGSIZE, ALIGN);
err = virtqueue_add_sgs(vq, sgs, 1, 1, &err, GFP_KERNEL);
if (err)
errx(1, "virtqueue_add_sgs: %i", err);
__kmalloc_fake = NULL;
/* Host retreives it. */
vringh_iov_init(&riov, host_riov, ARRAY_SIZE(host_riov));
vringh_iov_init(&wiov, host_wiov, ARRAY_SIZE(host_wiov));
err = vringh_getdesc_user(&vrh, &riov, &wiov, getrange, &head);
if (err != 1)
errx(1, "vringh_getdesc_user: %i", err);
assert(riov.used == 1);
assert(riov.iov[0].iov_base == __user_addr_max - 1);
assert(riov.iov[0].iov_len == 1);
if (getrange != getrange_slow) {
assert(wiov.used == 1);
assert(wiov.iov[0].iov_base == __user_addr_max - 3);
assert(wiov.iov[0].iov_len == 2);
} else {
assert(wiov.used == 2);
assert(wiov.iov[0].iov_base == __user_addr_max - 3);
assert(wiov.iov[0].iov_len == 1);
assert(wiov.iov[1].iov_base == __user_addr_max - 2);
assert(wiov.iov[1].iov_len == 1);
}
err = vringh_iov_pull_user(&riov, buf, 5);
if (err != 1)
errx(1, "vringh_iov_pull_user: %i", err);
assert(buf[0] == 'a');
assert(riov.i == 1);
assert(vringh_iov_pull_user(&riov, buf, 5) == 0);
memcpy(buf, "bcdef", 5);
err = vringh_iov_push_user(&wiov, buf, 5);
if (err != 2)
errx(1, "vringh_iov_push_user: %i", err);
assert(memcmp(__user_addr_max - 3, "bc", 2) == 0);
assert(wiov.i == wiov.used);
assert(vringh_iov_push_user(&wiov, buf, 5) == 0);
/* Host is done. */
err = vringh_complete_user(&vrh, head, err);
if (err != 0)
errx(1, "vringh_complete_user: %i", err);
/* Guest should see used token now. */
__kfree_ignore_start = __user_addr_min + vring_size(RINGSIZE, ALIGN);
__kfree_ignore_end = __kfree_ignore_start + 1;
ret = virtqueue_get_buf(vq, &i);
if (ret != &err)
errx(1, "virtqueue_get_buf: %p", ret);
assert(i == 2);
/* Guest puts in a huge descriptor. */
sg_init_table(guest_sg, RINGSIZE);
for (i = 0; i < RINGSIZE; i++) {
sg_set_buf(&guest_sg[i],
__user_addr_max - USER_MEM/4, USER_MEM/4);
}
/* Fill contents with recognisable garbage. */
for (i = 0; i < USER_MEM/4; i++)
((char *)__user_addr_max - USER_MEM/4)[i] = i;
/* This will allocate an indirect, so force it to allocate user addr */
__kmalloc_fake = __user_addr_min + vring_size(RINGSIZE, ALIGN);
err = virtqueue_add_outbuf(vq, guest_sg, RINGSIZE, &err, GFP_KERNEL);
if (err)
errx(1, "virtqueue_add_outbuf (large): %i", err);
__kmalloc_fake = NULL;
/* Host picks it up (allocates new iov). */
vringh_iov_init(&riov, host_riov, ARRAY_SIZE(host_riov));
vringh_iov_init(&wiov, host_wiov, ARRAY_SIZE(host_wiov));
err = vringh_getdesc_user(&vrh, &riov, &wiov, getrange, &head);
if (err != 1)
errx(1, "vringh_getdesc_user: %i", err);
assert(riov.max_num & VRINGH_IOV_ALLOCATED);
assert(riov.iov != host_riov);
if (getrange != getrange_slow)
assert(riov.used == RINGSIZE);
else
assert(riov.used == RINGSIZE * USER_MEM/4);
assert(!(wiov.max_num & VRINGH_IOV_ALLOCATED));
assert(wiov.used == 0);
/* Pull data back out (in odd chunks), should be as expected. */
for (i = 0; i < RINGSIZE * USER_MEM/4; i += 3) {
err = vringh_iov_pull_user(&riov, buf, 3);
if (err != 3 && i + err != RINGSIZE * USER_MEM/4)
errx(1, "vringh_iov_pull_user large: %i", err);
assert(buf[0] == (char)i);
assert(err < 2 || buf[1] == (char)(i + 1));
assert(err < 3 || buf[2] == (char)(i + 2));
}
assert(riov.i == riov.used);
vringh_iov_cleanup(&riov);
vringh_iov_cleanup(&wiov);
/* Complete using multi interface, just because we can. */
used[0].id = head;
used[0].len = 0;
err = vringh_complete_multi_user(&vrh, used, 1);
if (err)
errx(1, "vringh_complete_multi_user(1): %i", err);
/* Free up those descriptors. */
ret = virtqueue_get_buf(vq, &i);
if (ret != &err)
errx(1, "virtqueue_get_buf: %p", ret);
/* Add lots of descriptors. */
sg_init_table(guest_sg, 1);
sg_set_buf(&guest_sg[0], __user_addr_max - 1, 1);
for (i = 0; i < RINGSIZE; i++) {
err = virtqueue_add_outbuf(vq, guest_sg, 1, &err, GFP_KERNEL);
if (err)
errx(1, "virtqueue_add_outbuf (multiple): %i", err);
}
/* Now get many, and consume them all at once. */
vringh_iov_init(&riov, host_riov, ARRAY_SIZE(host_riov));
vringh_iov_init(&wiov, host_wiov, ARRAY_SIZE(host_wiov));
for (i = 0; i < RINGSIZE; i++) {
err = vringh_getdesc_user(&vrh, &riov, &wiov, getrange, &head);
if (err != 1)
errx(1, "vringh_getdesc_user: %i", err);
used[i].id = head;
used[i].len = 0;
}
/* Make sure it wraps around ring, to test! */
assert(vrh.vring.used->idx % RINGSIZE != 0);
err = vringh_complete_multi_user(&vrh, used, RINGSIZE);
if (err)
errx(1, "vringh_complete_multi_user: %i", err);
/* Free those buffers. */
for (i = 0; i < RINGSIZE; i++) {
unsigned len;
assert(virtqueue_get_buf(vq, &len) != NULL);
}
/* Test weird (but legal!) indirect. */
if (__virtio_test_bit(&vdev, VIRTIO_RING_F_INDIRECT_DESC)) {
char *data = __user_addr_max - USER_MEM/4;
struct vring_desc *d = __user_addr_max - USER_MEM/2;
struct vring vring;
/* Force creation of direct, which we modify. */
__virtio_clear_bit(&vdev, VIRTIO_RING_F_INDIRECT_DESC);
vq = vring_new_virtqueue(0, RINGSIZE, ALIGN, &vdev, true,
false, __user_addr_min,
never_notify_host,
never_callback_guest,
"guest vq");
sg_init_table(guest_sg, 4);
sg_set_buf(&guest_sg[0], d, sizeof(*d)*2);
sg_set_buf(&guest_sg[1], d + 2, sizeof(*d)*1);
sg_set_buf(&guest_sg[2], data + 6, 4);
sg_set_buf(&guest_sg[3], d + 3, sizeof(*d)*3);
err = virtqueue_add_outbuf(vq, guest_sg, 4, &err, GFP_KERNEL);
if (err)
errx(1, "virtqueue_add_outbuf (indirect): %i", err);
vring_init(&vring, RINGSIZE, __user_addr_min, ALIGN);
/* They're used in order, but double-check... */
assert(vring.desc[0].addr == (unsigned long)d);
assert(vring.desc[1].addr == (unsigned long)(d+2));
assert(vring.desc[2].addr == (unsigned long)data + 6);
assert(vring.desc[3].addr == (unsigned long)(d+3));
vring.desc[0].flags |= VRING_DESC_F_INDIRECT;
vring.desc[1].flags |= VRING_DESC_F_INDIRECT;
vring.desc[3].flags |= VRING_DESC_F_INDIRECT;
/* First indirect */
d[0].addr = (unsigned long)data;
d[0].len = 1;
d[0].flags = VRING_DESC_F_NEXT;
d[0].next = 1;
d[1].addr = (unsigned long)data + 1;
d[1].len = 2;
d[1].flags = 0;
/* Second indirect */
d[2].addr = (unsigned long)data + 3;
d[2].len = 3;
d[2].flags = 0;
/* Third indirect */
d[3].addr = (unsigned long)data + 10;
d[3].len = 5;
d[3].flags = VRING_DESC_F_NEXT;
d[3].next = 1;
d[4].addr = (unsigned long)data + 15;
d[4].len = 6;
d[4].flags = VRING_DESC_F_NEXT;
d[4].next = 2;
d[5].addr = (unsigned long)data + 21;
d[5].len = 7;
d[5].flags = 0;
/* Host picks it up (allocates new iov). */
vringh_iov_init(&riov, host_riov, ARRAY_SIZE(host_riov));
vringh_iov_init(&wiov, host_wiov, ARRAY_SIZE(host_wiov));
err = vringh_getdesc_user(&vrh, &riov, &wiov, getrange, &head);
if (err != 1)
errx(1, "vringh_getdesc_user: %i", err);
if (head != 0)
errx(1, "vringh_getdesc_user: head %i not 0", head);
assert(riov.max_num & VRINGH_IOV_ALLOCATED);
if (getrange != getrange_slow)
assert(riov.used == 7);
else
assert(riov.used == 28);
err = vringh_iov_pull_user(&riov, buf, 29);
assert(err == 28);
/* Data should be linear. */
for (i = 0; i < err; i++)
assert(buf[i] == i);
vringh_iov_cleanup(&riov);
}
/* Don't leak memory... */
vring_del_virtqueue(vq);
free(__user_addr_min);
return 0;
}