forked from luck/tmp_suning_uos_patched
tcm_vhost: Multi-target support
In order to take advantages of Paolo's multi-queue virito-scsi, we need multi-target support in tcm_vhost first. Otherwise all the requests go to one queue and other queues are idle. This patch makes: 1. All the targets under the wwpn is seen and can be used by guest. 2. No need to pass the tpgt number in struct vhost_scsi_target to tcm_vhost.ko. Only wwpn is needed. 3. We can always pass max_target = 255 to guest now, since we abort the request who's target id does not exist. Changes in v2: - Handle non-contiguous tpgt Changes in v3: - Simplfy lock in vhost_scsi_set_endpoint - Return -EEXIST when does not match Signed-off-by: Asias He <asias@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Asias He
Nicholas Bellinger
parent
adfa9570a5
commit
67e18cf9ab
|
|
@ -59,8 +59,14 @@ enum {
|
|||
VHOST_SCSI_VQ_IO = 2,
|
||||
};
|
||||
|
||||
#define VHOST_SCSI_MAX_TARGET 256
|
||||
|
||||
struct vhost_scsi {
|
||||
struct tcm_vhost_tpg *vs_tpg; /* Protected by vhost_scsi->dev.mutex */
|
||||
/* Protected by vhost_scsi->dev.mutex */
|
||||
struct tcm_vhost_tpg *vs_tpg[VHOST_SCSI_MAX_TARGET];
|
||||
char vs_vhost_wwpn[TRANSPORT_IQN_LEN];
|
||||
bool vs_endpoint;
|
||||
|
||||
struct vhost_dev dev;
|
||||
struct vhost_virtqueue vqs[3];
|
||||
|
||||
|
|
@ -564,10 +570,10 @@ static void vhost_scsi_handle_vq(struct vhost_scsi *vs)
|
|||
u32 exp_data_len, data_first, data_num, data_direction;
|
||||
unsigned out, in, i;
|
||||
int head, ret;
|
||||
u8 target;
|
||||
|
||||
/* Must use ioctl VHOST_SCSI_SET_ENDPOINT */
|
||||
tv_tpg = vs->vs_tpg;
|
||||
if (unlikely(!tv_tpg))
|
||||
if (unlikely(!vs->vs_endpoint))
|
||||
return;
|
||||
|
||||
mutex_lock(&vq->mutex);
|
||||
|
|
@ -635,6 +641,28 @@ static void vhost_scsi_handle_vq(struct vhost_scsi *vs)
|
|||
break;
|
||||
}
|
||||
|
||||
/* Extract the tpgt */
|
||||
target = v_req.lun[1];
|
||||
tv_tpg = vs->vs_tpg[target];
|
||||
|
||||
/* Target does not exist, fail the request */
|
||||
if (unlikely(!tv_tpg)) {
|
||||
struct virtio_scsi_cmd_resp __user *resp;
|
||||
struct virtio_scsi_cmd_resp rsp;
|
||||
|
||||
memset(&rsp, 0, sizeof(rsp));
|
||||
rsp.response = VIRTIO_SCSI_S_BAD_TARGET;
|
||||
resp = vq->iov[out].iov_base;
|
||||
ret = __copy_to_user(resp, &rsp, sizeof(rsp));
|
||||
if (!ret)
|
||||
vhost_add_used_and_signal(&vs->dev,
|
||||
&vs->vqs[2], head, 0);
|
||||
else
|
||||
pr_err("Faulted on virtio_scsi_cmd_resp\n");
|
||||
|
||||
continue;
|
||||
}
|
||||
|
||||
exp_data_len = 0;
|
||||
for (i = 0; i < data_num; i++)
|
||||
exp_data_len += vq->iov[data_first + i].iov_len;
|
||||
|
|
@ -743,7 +771,8 @@ static int vhost_scsi_set_endpoint(
|
|||
{
|
||||
struct tcm_vhost_tport *tv_tport;
|
||||
struct tcm_vhost_tpg *tv_tpg;
|
||||
int index;
|
||||
bool match = false;
|
||||
int index, ret;
|
||||
|
||||
mutex_lock(&vs->dev.mutex);
|
||||
/* Verify that ring has been setup correctly. */
|
||||
|
|
@ -754,7 +783,6 @@ static int vhost_scsi_set_endpoint(
|
|||
return -EFAULT;
|
||||
}
|
||||
}
|
||||
mutex_unlock(&vs->dev.mutex);
|
||||
|
||||
mutex_lock(&tcm_vhost_mutex);
|
||||
list_for_each_entry(tv_tpg, &tcm_vhost_list, tv_tpg_list) {
|
||||
|
|
@ -769,30 +797,33 @@ static int vhost_scsi_set_endpoint(
|
|||
}
|
||||
tv_tport = tv_tpg->tport;
|
||||
|
||||
if (!strcmp(tv_tport->tport_name, t->vhost_wwpn) &&
|
||||
(tv_tpg->tport_tpgt == t->vhost_tpgt)) {
|
||||
tv_tpg->tv_tpg_vhost_count++;
|
||||
mutex_unlock(&tv_tpg->tv_tpg_mutex);
|
||||
mutex_unlock(&tcm_vhost_mutex);
|
||||
|
||||
mutex_lock(&vs->dev.mutex);
|
||||
if (vs->vs_tpg) {
|
||||
mutex_unlock(&vs->dev.mutex);
|
||||
mutex_lock(&tv_tpg->tv_tpg_mutex);
|
||||
tv_tpg->tv_tpg_vhost_count--;
|
||||
if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
|
||||
if (vs->vs_tpg[tv_tpg->tport_tpgt]) {
|
||||
mutex_unlock(&tv_tpg->tv_tpg_mutex);
|
||||
mutex_unlock(&tcm_vhost_mutex);
|
||||
mutex_unlock(&vs->dev.mutex);
|
||||
return -EEXIST;
|
||||
}
|
||||
|
||||
vs->vs_tpg = tv_tpg;
|
||||
tv_tpg->tv_tpg_vhost_count++;
|
||||
vs->vs_tpg[tv_tpg->tport_tpgt] = tv_tpg;
|
||||
smp_mb__after_atomic_inc();
|
||||
mutex_unlock(&vs->dev.mutex);
|
||||
return 0;
|
||||
match = true;
|
||||
}
|
||||
mutex_unlock(&tv_tpg->tv_tpg_mutex);
|
||||
}
|
||||
mutex_unlock(&tcm_vhost_mutex);
|
||||
return -EINVAL;
|
||||
|
||||
if (match) {
|
||||
memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn,
|
||||
sizeof(vs->vs_vhost_wwpn));
|
||||
vs->vs_endpoint = true;
|
||||
ret = 0;
|
||||
} else {
|
||||
ret = -EEXIST;
|
||||
}
|
||||
|
||||
mutex_unlock(&vs->dev.mutex);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int vhost_scsi_clear_endpoint(
|
||||
|
|
@ -801,7 +832,8 @@ static int vhost_scsi_clear_endpoint(
|
|||
{
|
||||
struct tcm_vhost_tport *tv_tport;
|
||||
struct tcm_vhost_tpg *tv_tpg;
|
||||
int index, ret;
|
||||
int index, ret, i;
|
||||
u8 target;
|
||||
|
||||
mutex_lock(&vs->dev.mutex);
|
||||
/* Verify that ring has been setup correctly. */
|
||||
|
|
@ -811,27 +843,32 @@ static int vhost_scsi_clear_endpoint(
|
|||
goto err;
|
||||
}
|
||||
}
|
||||
for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) {
|
||||
target = i;
|
||||
|
||||
if (!vs->vs_tpg) {
|
||||
ret = -ENODEV;
|
||||
goto err;
|
||||
}
|
||||
tv_tpg = vs->vs_tpg;
|
||||
tv_tport = tv_tpg->tport;
|
||||
tv_tpg = vs->vs_tpg[target];
|
||||
if (!tv_tpg)
|
||||
continue;
|
||||
|
||||
if (strcmp(tv_tport->tport_name, t->vhost_wwpn) ||
|
||||
(tv_tpg->tport_tpgt != t->vhost_tpgt)) {
|
||||
pr_warn("tv_tport->tport_name: %s, tv_tpg->tport_tpgt: %hu"
|
||||
" does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
|
||||
tv_tport->tport_name, tv_tpg->tport_tpgt,
|
||||
t->vhost_wwpn, t->vhost_tpgt);
|
||||
ret = -EINVAL;
|
||||
goto err;
|
||||
tv_tport = tv_tpg->tport;
|
||||
if (!tv_tport) {
|
||||
ret = -ENODEV;
|
||||
goto err;
|
||||
}
|
||||
|
||||
if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
|
||||
pr_warn("tv_tport->tport_name: %s, tv_tpg->tport_tpgt: %hu"
|
||||
" does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
|
||||
tv_tport->tport_name, tv_tpg->tport_tpgt,
|
||||
t->vhost_wwpn, t->vhost_tpgt);
|
||||
ret = -EINVAL;
|
||||
goto err;
|
||||
}
|
||||
tv_tpg->tv_tpg_vhost_count--;
|
||||
vs->vs_tpg[target] = NULL;
|
||||
vs->vs_endpoint = false;
|
||||
}
|
||||
tv_tpg->tv_tpg_vhost_count--;
|
||||
vs->vs_tpg = NULL;
|
||||
mutex_unlock(&vs->dev.mutex);
|
||||
|
||||
return 0;
|
||||
|
||||
err:
|
||||
|
|
@ -866,16 +903,12 @@ static int vhost_scsi_open(struct inode *inode, struct file *f)
|
|||
static int vhost_scsi_release(struct inode *inode, struct file *f)
|
||||
{
|
||||
struct vhost_scsi *s = f->private_data;
|
||||
struct vhost_scsi_target t;
|
||||
|
||||
if (s->vs_tpg && s->vs_tpg->tport) {
|
||||
struct vhost_scsi_target backend;
|
||||
|
||||
memcpy(backend.vhost_wwpn, s->vs_tpg->tport->tport_name,
|
||||
sizeof(backend.vhost_wwpn));
|
||||
backend.vhost_tpgt = s->vs_tpg->tport_tpgt;
|
||||
vhost_scsi_clear_endpoint(s, &backend);
|
||||
}
|
||||
|
||||
mutex_lock(&s->dev.mutex);
|
||||
memcpy(t.vhost_wwpn, s->vs_vhost_wwpn, sizeof(t.vhost_wwpn));
|
||||
mutex_unlock(&s->dev.mutex);
|
||||
vhost_scsi_clear_endpoint(s, &t);
|
||||
vhost_dev_stop(&s->dev);
|
||||
vhost_dev_cleanup(&s->dev, false);
|
||||
kfree(s);
|
||||
|
|
|
|||
|
|
@ -93,9 +93,11 @@ struct tcm_vhost_tport {
|
|||
*
|
||||
* ABI Rev 0: July 2012 version starting point for v3.6-rc merge candidate +
|
||||
* RFC-v2 vhost-scsi userspace. Add GET_ABI_VERSION ioctl usage
|
||||
* ABI Rev 1: January 2013. Ignore vhost_tpgt filed in struct vhost_scsi_target.
|
||||
* All the targets under vhost_wwpn can be seen and used by guset.
|
||||
*/
|
||||
|
||||
#define VHOST_SCSI_ABI_VERSION 0
|
||||
#define VHOST_SCSI_ABI_VERSION 1
|
||||
|
||||
struct vhost_scsi_target {
|
||||
int abi_version;
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user