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vhost-blk: add resize bdev support

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This will allow us to resize the backend bdev of vhost-blk
and notify the guest OS that the capactiy of virtio-blk
disk has been resized.

The spdk api entry is `spdk_bdev_notify_blockcnt_change`.
Any bdev if used as vhost-blk backend may need to implement
a rpc that calls this function.

Related DPDK patch has been merged and release in 20.02.
https://www.mail-archive.com/dev@dpdk.org/msg153365.html

Change-Id: I961c61de0fc03e210d776035a40f3a4adfa9b4f3
Signed-off-by: Li Feng <fengli@smartx.com>
Signed-off-by: Jin Yu <jin.yu@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/1468
Community-CI: Mellanox Build Bot
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
Reviewed-by: Aleksey Marchuk <alexeymar@mellanox.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
This commit is contained in:
Jin Yu 2020-03-26 22:05:19 +08:00 committed by Tomasz Zawadzki
parent 0b1799cd98
commit b45f293d57
1 changed files with 51 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
lib/vhost/vhost_blk.c
View File

@ -44,6 +44,7 @@
#include "spdk/vhost.h"
#include "vhost_internal.h"
#include <rte_version.h>
/* Minimal set of features supported by every SPDK VHOST-BLK device */
#define SPDK_VHOST_BLK_FEATURES_BASE (SPDK_VHOST_FEATURES | \
@ -801,6 +802,32 @@ to_blk_dev(struct spdk_vhost_dev *vdev)
return SPDK_CONTAINEROF(vdev, struct spdk_vhost_blk_dev, vdev);
}
static int
vhost_session_bdev_resize_cb(struct spdk_vhost_dev *vdev,
struct spdk_vhost_session *vsession,
void *ctx)
{
#if RTE_VERSION >= RTE_VERSION_NUM(20, 02, 0, 0)
SPDK_NOTICELOG("bdev send slave msg to vid(%d)\n", vsession->vid);
rte_vhost_slave_config_change(vsession->vid, false);
#else
SPDK_NOTICELOG("bdev does not support resize until DPDK submodule version >= 20.02\n");
#endif
return 0;
}
static void
blk_resize_cb(void *resize_ctx)
{
struct spdk_vhost_blk_dev *bvdev = resize_ctx;
spdk_vhost_lock();
vhost_dev_foreach_session(&bvdev->vdev, vhost_session_bdev_resize_cb,
NULL, NULL);
spdk_vhost_unlock();
}
static void
vhost_dev_bdev_remove_cpl_cb(struct spdk_vhost_dev *vdev, void *ctx)
{
@ -845,6 +872,29 @@ bdev_remove_cb(void *remove_ctx)
spdk_vhost_unlock();
}
static void
bdev_event_cb(enum spdk_bdev_event_type type, struct spdk_bdev *bdev,
void *event_ctx)
{
SPDK_DEBUGLOG(SPDK_LOG_VHOST_BLK, "Bdev event: type %d, name %s\n",
type,
bdev->name);
switch (type) {
case SPDK_BDEV_EVENT_REMOVE:
SPDK_NOTICELOG("bdev name (%s) received event(SPDK_BDEV_EVENT_REMOVE)\n", bdev->name);
bdev_remove_cb(event_ctx);
break;
case SPDK_BDEV_EVENT_RESIZE:
SPDK_NOTICELOG("bdev name (%s) received event(SPDK_BDEV_EVENT_RESIZE)\n", bdev->name);
blk_resize_cb(event_ctx);
break;
default:
SPDK_NOTICELOG("Unsupported bdev event: type %d\n", type);
break;
}
}
static void
free_task_pool(struct spdk_vhost_blk_session *bvsession)
{
@ -1234,7 +1284,7 @@ spdk_vhost_blk_construct(const char *name, const char *cpumask, const char *dev_
vdev->virtio_features |= (1ULL << VIRTIO_BLK_F_FLUSH);
}
ret = spdk_bdev_open(bdev, true, bdev_remove_cb, bvdev, &bvdev->bdev_desc);
ret = spdk_bdev_open_ext(dev_name, true, bdev_event_cb, bvdev, &bvdev->bdev_desc);
if (ret != 0) {
SPDK_ERRLOG("%s: could not open bdev '%s', error=%d\n",
name, dev_name, ret);