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vhost: fixes and cleanups 3.11

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This includes some fixes and cleanups for vhost net and scsi drivers.
 The scsi driver changes will cause a conflict with  Nicholas Bellinger's scsi
 target changes, but the conflicting commit in my tree simply renames some
 variables so it's trivial to resolve.
 
 Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

Pull vhost fixes and cleanups from Michael S Tsirkin:
 "This includes some fixes and cleanups for vhost net and scsi drivers"

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost:
  vhost/test: update test after vhost cleanups
  vhost: Make local function static
  vhost: Make vhost a separate module
  vhost-scsi: Rename struct tcm_vhost_cmd *tv_cmd to *cmd
  vhost-scsi: Rename struct tcm_vhost_tpg *tv_tpg to *tpg
  vhost-scsi: Make func indention more consistent
  vhost-scsi: Rename struct vhost_scsi *s to *vs
  vhost-scsi: Remove unnecessary forward struct vhost_scsi declaration
  vhost: Simplify dev->vqs[i] access
  vhost-net: fix use-after-free in vhost_net_flush
This commit is contained in:
Linus Torvalds 2013-07-10 14:48:50 -07:00
commit 8d10aae274
7 changed files with 350 additions and 260 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/vhost/Kconfig
View File

@ -1,6 +1,7 @@
config VHOST_NET
tristate "Host kernel accelerator for virtio net"
depends on NET && EVENTFD && (TUN || !TUN) && (MACVTAP || !MACVTAP)
select VHOST
select VHOST_RING
---help---
This kernel module can be loaded in host kernel to accelerate
@ -13,6 +14,7 @@ config VHOST_NET
config VHOST_SCSI
tristate "VHOST_SCSI TCM fabric driver"
depends on TARGET_CORE && EVENTFD && m
select VHOST
select VHOST_RING
default n
---help---
@ -24,3 +26,9 @@ config VHOST_RING
---help---
This option is selected by any driver which needs to access
the host side of a virtio ring.
config VHOST
tristate
---help---
This option is selected by any driver which needs to access
the core of vhost.

3
drivers/vhost/Makefile
View File

@ -1,7 +1,8 @@
obj-$(CONFIG_VHOST_NET) += vhost_net.o
vhost_net-y := vhost.o net.o
vhost_net-y := net.o
obj-$(CONFIG_VHOST_SCSI) += vhost_scsi.o
vhost_scsi-y := scsi.o
obj-$(CONFIG_VHOST_RING) += vringh.o
obj-$(CONFIG_VHOST) += vhost.o

4
drivers/vhost/net.c
View File

@ -168,7 +168,7 @@ static void vhost_net_clear_ubuf_info(struct vhost_net *n)
}
}
int vhost_net_set_ubuf_info(struct vhost_net *n)
static int vhost_net_set_ubuf_info(struct vhost_net *n)
{
bool zcopy;
int i;
@ -189,7 +189,7 @@ err:
return -ENOMEM;
}
void vhost_net_vq_reset(struct vhost_net *n)
static void vhost_net_vq_reset(struct vhost_net *n)
{
int i;

472
drivers/vhost/scsi.c
View File

@ -49,7 +49,6 @@
#include <linux/llist.h>
#include <linux/bitmap.h>
#include "vhost.c"
#include "vhost.h"
#define TCM_VHOST_VERSION "v0.1"
@ -116,7 +115,6 @@ struct tcm_vhost_nacl {
struct se_node_acl se_node_acl;
};
struct vhost_scsi;
struct tcm_vhost_tpg {
/* Vhost port target portal group tag for TCM */
u16 tport_tpgt;
@ -218,7 +216,7 @@ static int iov_num_pages(struct iovec *iov)
((unsigned long)iov->iov_base & PAGE_MASK)) >> PAGE_SHIFT;
}
void tcm_vhost_done_inflight(struct kref *kref)
static void tcm_vhost_done_inflight(struct kref *kref)
{
struct vhost_scsi_inflight *inflight;
@ -329,11 +327,12 @@ static u32 tcm_vhost_get_default_depth(struct se_portal_group *se_tpg)
return 1;
}
static u32 tcm_vhost_get_pr_transport_id(struct se_portal_group *se_tpg,
struct se_node_acl *se_nacl,
struct t10_pr_registration *pr_reg,
int *format_code,
unsigned char *buf)
static u32
tcm_vhost_get_pr_transport_id(struct se_portal_group *se_tpg,
struct se_node_acl *se_nacl,
struct t10_pr_registration *pr_reg,
int *format_code,
unsigned char *buf)
{
struct tcm_vhost_tpg *tpg = container_of(se_tpg,
struct tcm_vhost_tpg, se_tpg);
@ -359,10 +358,11 @@ static u32 tcm_vhost_get_pr_transport_id(struct se_portal_group *se_tpg,
format_code, buf);
}
static u32 tcm_vhost_get_pr_transport_id_len(struct se_portal_group *se_tpg,
struct se_node_acl *se_nacl,
struct t10_pr_registration *pr_reg,
int *format_code)
static u32
tcm_vhost_get_pr_transport_id_len(struct se_portal_group *se_tpg,
struct se_node_acl *se_nacl,
struct t10_pr_registration *pr_reg,
int *format_code)
{
struct tcm_vhost_tpg *tpg = container_of(se_tpg,
struct tcm_vhost_tpg, se_tpg);
@ -388,10 +388,11 @@ static u32 tcm_vhost_get_pr_transport_id_len(struct se_portal_group *se_tpg,
format_code);
}
static char *tcm_vhost_parse_pr_out_transport_id(struct se_portal_group *se_tpg,
const char *buf,
u32 *out_tid_len,
char **port_nexus_ptr)
static char *
tcm_vhost_parse_pr_out_transport_id(struct se_portal_group *se_tpg,
const char *buf,
u32 *out_tid_len,
char **port_nexus_ptr)
{
struct tcm_vhost_tpg *tpg = container_of(se_tpg,
struct tcm_vhost_tpg, se_tpg);
@ -417,8 +418,8 @@ static char *tcm_vhost_parse_pr_out_transport_id(struct se_portal_group *se_tpg,
port_nexus_ptr);
}
static struct se_node_acl *tcm_vhost_alloc_fabric_acl(
struct se_portal_group *se_tpg)
static struct se_node_acl *
tcm_vhost_alloc_fabric_acl(struct se_portal_group *se_tpg)
{
struct tcm_vhost_nacl *nacl;
@ -431,8 +432,9 @@ static struct se_node_acl *tcm_vhost_alloc_fabric_acl(
return &nacl->se_node_acl;
}
static void tcm_vhost_release_fabric_acl(struct se_portal_group *se_tpg,
struct se_node_acl *se_nacl)
static void
tcm_vhost_release_fabric_acl(struct se_portal_group *se_tpg,
struct se_node_acl *se_nacl)
{
struct tcm_vhost_nacl *nacl = container_of(se_nacl,
struct tcm_vhost_nacl, se_node_acl);
@ -491,28 +493,28 @@ static int tcm_vhost_get_cmd_state(struct se_cmd *se_cmd)
return 0;
}
static void vhost_scsi_complete_cmd(struct tcm_vhost_cmd *tv_cmd)
static void vhost_scsi_complete_cmd(struct tcm_vhost_cmd *cmd)
{
struct vhost_scsi *vs = tv_cmd->tvc_vhost;
struct vhost_scsi *vs = cmd->tvc_vhost;
llist_add(&tv_cmd->tvc_completion_list, &vs->vs_completion_list);
llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list);
vhost_work_queue(&vs->dev, &vs->vs_completion_work);
}
static int tcm_vhost_queue_data_in(struct se_cmd *se_cmd)
{
struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd,
struct tcm_vhost_cmd *cmd = container_of(se_cmd,
struct tcm_vhost_cmd, tvc_se_cmd);
vhost_scsi_complete_cmd(tv_cmd);
vhost_scsi_complete_cmd(cmd);
return 0;
}
static int tcm_vhost_queue_status(struct se_cmd *se_cmd)
{
struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd,
struct tcm_vhost_cmd *cmd = container_of(se_cmd,
struct tcm_vhost_cmd, tvc_se_cmd);
vhost_scsi_complete_cmd(tv_cmd);
vhost_scsi_complete_cmd(cmd);
return 0;
}
@ -527,8 +529,9 @@ static void tcm_vhost_free_evt(struct vhost_scsi *vs, struct tcm_vhost_evt *evt)
kfree(evt);
}
static struct tcm_vhost_evt *tcm_vhost_allocate_evt(struct vhost_scsi *vs,
u32 event, u32 reason)
static struct tcm_vhost_evt *
tcm_vhost_allocate_evt(struct vhost_scsi *vs,
u32 event, u32 reason)
{
struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
struct tcm_vhost_evt *evt;
@ -552,28 +555,28 @@ static struct tcm_vhost_evt *tcm_vhost_allocate_evt(struct vhost_scsi *vs,
return evt;
}
static void vhost_scsi_free_cmd(struct tcm_vhost_cmd *tv_cmd)
static void vhost_scsi_free_cmd(struct tcm_vhost_cmd *cmd)
{
struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
/* TODO locking against target/backend threads? */
transport_generic_free_cmd(se_cmd, 1);
if (tv_cmd->tvc_sgl_count) {
if (cmd->tvc_sgl_count) {
u32 i;
for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
put_page(sg_page(&tv_cmd->tvc_sgl[i]));
for (i = 0; i < cmd->tvc_sgl_count; i++)
put_page(sg_page(&cmd->tvc_sgl[i]));
kfree(tv_cmd->tvc_sgl);
kfree(cmd->tvc_sgl);
}
tcm_vhost_put_inflight(tv_cmd->inflight);
tcm_vhost_put_inflight(cmd->inflight);
kfree(tv_cmd);
kfree(cmd);
}
static void tcm_vhost_do_evt_work(struct vhost_scsi *vs,
struct tcm_vhost_evt *evt)
static void
tcm_vhost_do_evt_work(struct vhost_scsi *vs, struct tcm_vhost_evt *evt)
{
struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
struct virtio_scsi_event *event = &evt->event;
@ -652,7 +655,7 @@ static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
vs_completion_work);
DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ);
struct virtio_scsi_cmd_resp v_rsp;
struct tcm_vhost_cmd *tv_cmd;
struct tcm_vhost_cmd *cmd;
struct llist_node *llnode;
struct se_cmd *se_cmd;
int ret, vq;
@ -660,32 +663,32 @@ static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
bitmap_zero(signal, VHOST_SCSI_MAX_VQ);
llnode = llist_del_all(&vs->vs_completion_list);
while (llnode) {
tv_cmd = llist_entry(llnode, struct tcm_vhost_cmd,
cmd = llist_entry(llnode, struct tcm_vhost_cmd,
tvc_completion_list);
llnode = llist_next(llnode);
se_cmd = &tv_cmd->tvc_se_cmd;
se_cmd = &cmd->tvc_se_cmd;
pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__,
tv_cmd, se_cmd->residual_count, se_cmd->scsi_status);
cmd, se_cmd->residual_count, se_cmd->scsi_status);
memset(&v_rsp, 0, sizeof(v_rsp));
v_rsp.resid = se_cmd->residual_count;
/* TODO is status_qualifier field needed? */
v_rsp.status = se_cmd->scsi_status;
v_rsp.sense_len = se_cmd->scsi_sense_length;
memcpy(v_rsp.sense, tv_cmd->tvc_sense_buf,
memcpy(v_rsp.sense, cmd->tvc_sense_buf,
v_rsp.sense_len);
ret = copy_to_user(tv_cmd->tvc_resp, &v_rsp, sizeof(v_rsp));
ret = copy_to_user(cmd->tvc_resp, &v_rsp, sizeof(v_rsp));
if (likely(ret == 0)) {
struct vhost_scsi_virtqueue *q;
vhost_add_used(tv_cmd->tvc_vq, tv_cmd->tvc_vq_desc, 0);
q = container_of(tv_cmd->tvc_vq, struct vhost_scsi_virtqueue, vq);
vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0);
q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq);
vq = q - vs->vqs;
__set_bit(vq, signal);
} else
pr_err("Faulted on virtio_scsi_cmd_resp\n");
vhost_scsi_free_cmd(tv_cmd);
vhost_scsi_free_cmd(cmd);
}
vq = -1;
@ -694,35 +697,35 @@ static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
vhost_signal(&vs->dev, &vs->vqs[vq].vq);
}
static struct tcm_vhost_cmd *vhost_scsi_allocate_cmd(
struct vhost_virtqueue *vq,
struct tcm_vhost_tpg *tv_tpg,
struct virtio_scsi_cmd_req *v_req,
u32 exp_data_len,
int data_direction)
static struct tcm_vhost_cmd *
vhost_scsi_allocate_cmd(struct vhost_virtqueue *vq,
struct tcm_vhost_tpg *tpg,
struct virtio_scsi_cmd_req *v_req,
u32 exp_data_len,
int data_direction)
{
struct tcm_vhost_cmd *tv_cmd;
struct tcm_vhost_cmd *cmd;
struct tcm_vhost_nexus *tv_nexus;
tv_nexus = tv_tpg->tpg_nexus;
tv_nexus = tpg->tpg_nexus;
if (!tv_nexus) {
pr_err("Unable to locate active struct tcm_vhost_nexus\n");
return ERR_PTR(-EIO);
}
tv_cmd = kzalloc(sizeof(struct tcm_vhost_cmd), GFP_ATOMIC);
if (!tv_cmd) {
cmd = kzalloc(sizeof(struct tcm_vhost_cmd), GFP_ATOMIC);
if (!cmd) {
pr_err("Unable to allocate struct tcm_vhost_cmd\n");
return ERR_PTR(-ENOMEM);
}
tv_cmd->tvc_tag = v_req->tag;
tv_cmd->tvc_task_attr = v_req->task_attr;
tv_cmd->tvc_exp_data_len = exp_data_len;
tv_cmd->tvc_data_direction = data_direction;
tv_cmd->tvc_nexus = tv_nexus;
tv_cmd->inflight = tcm_vhost_get_inflight(vq);
cmd->tvc_tag = v_req->tag;
cmd->tvc_task_attr = v_req->task_attr;
cmd->tvc_exp_data_len = exp_data_len;
cmd->tvc_data_direction = data_direction;
cmd->tvc_nexus = tv_nexus;
cmd->inflight = tcm_vhost_get_inflight(vq);
return tv_cmd;
return cmd;
}
/*
@ -730,8 +733,11 @@ static struct tcm_vhost_cmd *vhost_scsi_allocate_cmd(
*
* Returns the number of scatterlist entries used or -errno on error.
*/
static int vhost_scsi_map_to_sgl(struct scatterlist *sgl,
unsigned int sgl_count, struct iovec *iov, int write)
static int
vhost_scsi_map_to_sgl(struct scatterlist *sgl,
unsigned int sgl_count,
struct iovec *iov,
int write)
{
unsigned int npages = 0, pages_nr, offset, nbytes;
struct scatterlist *sg = sgl;
@ -775,8 +781,11 @@ out:
return ret;
}
static int vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *tv_cmd,
struct iovec *iov, unsigned int niov, int write)
static int
vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *cmd,
struct iovec *iov,
unsigned int niov,
int write)
{
int ret;
unsigned int i;
@ -792,25 +801,25 @@ static int vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *tv_cmd,
/* TODO overflow checking */
sg = kmalloc(sizeof(tv_cmd->tvc_sgl[0]) * sgl_count, GFP_ATOMIC);
sg = kmalloc(sizeof(cmd->tvc_sgl[0]) * sgl_count, GFP_ATOMIC);
if (!sg)
return -ENOMEM;
pr_debug("%s sg %p sgl_count %u is_err %d\n", __func__,
sg, sgl_count, !sg);
sg_init_table(sg, sgl_count);
tv_cmd->tvc_sgl = sg;
tv_cmd->tvc_sgl_count = sgl_count;
cmd->tvc_sgl = sg;
cmd->tvc_sgl_count = sgl_count;
pr_debug("Mapping %u iovecs for %u pages\n", niov, sgl_count);
for (i = 0; i < niov; i++) {
ret = vhost_scsi_map_to_sgl(sg, sgl_count, &iov[i], write);
if (ret < 0) {
for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
put_page(sg_page(&tv_cmd->tvc_sgl[i]));
kfree(tv_cmd->tvc_sgl);
tv_cmd->tvc_sgl = NULL;
tv_cmd->tvc_sgl_count = 0;
for (i = 0; i < cmd->tvc_sgl_count; i++)
put_page(sg_page(&cmd->tvc_sgl[i]));
kfree(cmd->tvc_sgl);
cmd->tvc_sgl = NULL;
cmd->tvc_sgl_count = 0;
return ret;
}
@ -822,15 +831,15 @@ static int vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *tv_cmd,
static void tcm_vhost_submission_work(struct work_struct *work)
{
struct tcm_vhost_cmd *tv_cmd =
struct tcm_vhost_cmd *cmd =
container_of(work, struct tcm_vhost_cmd, work);
struct tcm_vhost_nexus *tv_nexus;
struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
struct scatterlist *sg_ptr, *sg_bidi_ptr = NULL;
int rc, sg_no_bidi = 0;
if (tv_cmd->tvc_sgl_count) {
sg_ptr = tv_cmd->tvc_sgl;
if (cmd->tvc_sgl_count) {
sg_ptr = cmd->tvc_sgl;
/* FIXME: Fix BIDI operation in tcm_vhost_submission_work() */
#if 0
if (se_cmd->se_cmd_flags & SCF_BIDI) {
@ -841,13 +850,13 @@ static void tcm_vhost_submission_work(struct work_struct *work)
} else {
sg_ptr = NULL;
}
tv_nexus = tv_cmd->tvc_nexus;
tv_nexus = cmd->tvc_nexus;
rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess,
tv_cmd->tvc_cdb, &tv_cmd->tvc_sense_buf[0],
tv_cmd->tvc_lun, tv_cmd->tvc_exp_data_len,
tv_cmd->tvc_task_attr, tv_cmd->tvc_data_direction,
0, sg_ptr, tv_cmd->tvc_sgl_count,
cmd->tvc_cdb, &cmd->tvc_sense_buf[0],
cmd->tvc_lun, cmd->tvc_exp_data_len,
cmd->tvc_task_attr, cmd->tvc_data_direction,
0, sg_ptr, cmd->tvc_sgl_count,
sg_bidi_ptr, sg_no_bidi);
if (rc < 0) {
transport_send_check_condition_and_sense(se_cmd,
@ -856,8 +865,10 @@ static void tcm_vhost_submission_work(struct work_struct *work)
}
}
static void vhost_scsi_send_bad_target(struct vhost_scsi *vs,
struct vhost_virtqueue *vq, int head, unsigned out)
static void
vhost_scsi_send_bad_target(struct vhost_scsi *vs,
struct vhost_virtqueue *vq,
int head, unsigned out)
{
struct virtio_scsi_cmd_resp __user *resp;
struct virtio_scsi_cmd_resp rsp;
@ -873,13 +884,13 @@ static void vhost_scsi_send_bad_target(struct vhost_scsi *vs,
pr_err("Faulted on virtio_scsi_cmd_resp\n");
}
static void vhost_scsi_handle_vq(struct vhost_scsi *vs,
struct vhost_virtqueue *vq)
static void
vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
{
struct tcm_vhost_tpg **vs_tpg;
struct virtio_scsi_cmd_req v_req;
struct tcm_vhost_tpg *tv_tpg;
struct tcm_vhost_cmd *tv_cmd;
struct tcm_vhost_tpg *tpg;
struct tcm_vhost_cmd *cmd;
u32 exp_data_len, data_first, data_num, data_direction;
unsigned out, in, i;
int head, ret;
@ -964,10 +975,10 @@ static void vhost_scsi_handle_vq(struct vhost_scsi *vs,
/* Extract the tpgt */
target = v_req.lun[1];
tv_tpg = ACCESS_ONCE(vs_tpg[target]);
tpg = ACCESS_ONCE(vs_tpg[target]);
/* Target does not exist, fail the request */
if (unlikely(!tv_tpg)) {
if (unlikely(!tpg)) {
vhost_scsi_send_bad_target(vs, vq, head, out);
continue;
}
@ -976,46 +987,46 @@ static void vhost_scsi_handle_vq(struct vhost_scsi *vs,
for (i = 0; i < data_num; i++)
exp_data_len += vq->iov[data_first + i].iov_len;
tv_cmd = vhost_scsi_allocate_cmd(vq, tv_tpg, &v_req,
cmd = vhost_scsi_allocate_cmd(vq, tpg, &v_req,
exp_data_len, data_direction);
if (IS_ERR(tv_cmd)) {
if (IS_ERR(cmd)) {
vq_err(vq, "vhost_scsi_allocate_cmd failed %ld\n",
PTR_ERR(tv_cmd));
PTR_ERR(cmd));
goto err_cmd;
}
pr_debug("Allocated tv_cmd: %p exp_data_len: %d, data_direction"
": %d\n", tv_cmd, exp_data_len, data_direction);
": %d\n", cmd, exp_data_len, data_direction);
tv_cmd->tvc_vhost = vs;
tv_cmd->tvc_vq = vq;
tv_cmd->tvc_resp = vq->iov[out].iov_base;
cmd->tvc_vhost = vs;
cmd->tvc_vq = vq;
cmd->tvc_resp = vq->iov[out].iov_base;
/*
* Copy in the recieved CDB descriptor into tv_cmd->tvc_cdb
* Copy in the recieved CDB descriptor into cmd->tvc_cdb
* that will be used by tcm_vhost_new_cmd_map() and down into
* target_setup_cmd_from_cdb()
*/
memcpy(tv_cmd->tvc_cdb, v_req.cdb, TCM_VHOST_MAX_CDB_SIZE);
memcpy(cmd->tvc_cdb, v_req.cdb, TCM_VHOST_MAX_CDB_SIZE);
/*
* Check that the recieved CDB size does not exceeded our
* hardcoded max for tcm_vhost
*/
/* TODO what if cdb was too small for varlen cdb header? */
if (unlikely(scsi_command_size(tv_cmd->tvc_cdb) >
if (unlikely(scsi_command_size(cmd->tvc_cdb) >
TCM_VHOST_MAX_CDB_SIZE)) {
vq_err(vq, "Received SCSI CDB with command_size: %d that"
" exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
scsi_command_size(tv_cmd->tvc_cdb),
scsi_command_size(cmd->tvc_cdb),
TCM_VHOST_MAX_CDB_SIZE);
goto err_free;
}
tv_cmd->tvc_lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
cmd->tvc_lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
tv_cmd->tvc_cdb[0], tv_cmd->tvc_lun);
cmd->tvc_cdb[0], cmd->tvc_lun);
if (data_direction != DMA_NONE) {
ret = vhost_scsi_map_iov_to_sgl(tv_cmd,
ret = vhost_scsi_map_iov_to_sgl(cmd,
&vq->iov[data_first], data_num,
data_direction == DMA_TO_DEVICE);
if (unlikely(ret)) {
@ -1029,22 +1040,22 @@ static void vhost_scsi_handle_vq(struct vhost_scsi *vs,
* complete the virtio-scsi request in TCM callback context via
* tcm_vhost_queue_data_in() and tcm_vhost_queue_status()
*/
tv_cmd->tvc_vq_desc = head;
cmd->tvc_vq_desc = head;
/*
* Dispatch tv_cmd descriptor for cmwq execution in process
* context provided by tcm_vhost_workqueue. This also ensures
* tv_cmd is executed on the same kworker CPU as this vhost
* thread to gain positive L2 cache locality effects..
*/
INIT_WORK(&tv_cmd->work, tcm_vhost_submission_work);
queue_work(tcm_vhost_workqueue, &tv_cmd->work);
INIT_WORK(&cmd->work, tcm_vhost_submission_work);
queue_work(tcm_vhost_workqueue, &cmd->work);
}
mutex_unlock(&vq->mutex);
return;
err_free:
vhost_scsi_free_cmd(tv_cmd);
vhost_scsi_free_cmd(cmd);
err_cmd:
vhost_scsi_send_bad_target(vs, vq, head, out);
mutex_unlock(&vq->mutex);
@ -1055,8 +1066,12 @@ static void vhost_scsi_ctl_handle_kick(struct vhost_work *work)
pr_debug("%s: The handling func for control queue.\n", __func__);
}
static void tcm_vhost_send_evt(struct vhost_scsi *vs, struct tcm_vhost_tpg *tpg,
struct se_lun *lun, u32 event, u32 reason)
static void
tcm_vhost_send_evt(struct vhost_scsi *vs,
struct tcm_vhost_tpg *tpg,
struct se_lun *lun,
u32 event,
u32 reason)
{
struct tcm_vhost_evt *evt;
@ -1146,12 +1161,12 @@ static void vhost_scsi_flush(struct vhost_scsi *vs)
* The lock nesting rule is:
* tcm_vhost_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex
*/
static int vhost_scsi_set_endpoint(
struct vhost_scsi *vs,
struct vhost_scsi_target *t)
static int
vhost_scsi_set_endpoint(struct vhost_scsi *vs,
struct vhost_scsi_target *t)
{
struct tcm_vhost_tport *tv_tport;
struct tcm_vhost_tpg *tv_tpg;
struct tcm_vhost_tpg *tpg;
struct tcm_vhost_tpg **vs_tpg;
struct vhost_virtqueue *vq;
int index, ret, i, len;
@ -1178,32 +1193,32 @@ static int vhost_scsi_set_endpoint(
if (vs->vs_tpg)
memcpy(vs_tpg, vs->vs_tpg, len);
list_for_each_entry(tv_tpg, &tcm_vhost_list, tv_tpg_list) {
mutex_lock(&tv_tpg->tv_tpg_mutex);
if (!tv_tpg->tpg_nexus) {
mutex_unlock(&tv_tpg->tv_tpg_mutex);
list_for_each_entry(tpg, &tcm_vhost_list, tv_tpg_list) {
mutex_lock(&tpg->tv_tpg_mutex);
if (!tpg->tpg_nexus) {
mutex_unlock(&tpg->tv_tpg_mutex);
continue;
}
if (tv_tpg->tv_tpg_vhost_count != 0) {
mutex_unlock(&tv_tpg->tv_tpg_mutex);
if (tpg->tv_tpg_vhost_count != 0) {
mutex_unlock(&tpg->tv_tpg_mutex);
continue;
}
tv_tport = tv_tpg->tport;
tv_tport = tpg->tport;
if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
if (vs->vs_tpg && vs->vs_tpg[tv_tpg->tport_tpgt]) {
if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) {
kfree(vs_tpg);
mutex_unlock(&tv_tpg->tv_tpg_mutex);
mutex_unlock(&tpg->tv_tpg_mutex);
ret = -EEXIST;
goto out;
}
tv_tpg->tv_tpg_vhost_count++;
tv_tpg->vhost_scsi = vs;
vs_tpg[tv_tpg->tport_tpgt] = tv_tpg;
tpg->tv_tpg_vhost_count++;
tpg->vhost_scsi = vs;
vs_tpg[tpg->tport_tpgt] = tpg;
smp_mb__after_atomic_inc();
match = true;
}
mutex_unlock(&tv_tpg->tv_tpg_mutex);
mutex_unlock(&tpg->tv_tpg_mutex);
}
if (match) {
@ -1236,12 +1251,12 @@ out:
return ret;
}
static int vhost_scsi_clear_endpoint(
struct vhost_scsi *vs,
struct vhost_scsi_target *t)
static int
vhost_scsi_clear_endpoint(struct vhost_scsi *vs,
struct vhost_scsi_target *t)
{
struct tcm_vhost_tport *tv_tport;
struct tcm_vhost_tpg *tv_tpg;
struct tcm_vhost_tpg *tpg;
struct vhost_virtqueue *vq;
bool match = false;
int index, ret, i;
@ -1264,30 +1279,30 @@ static int vhost_scsi_clear_endpoint(
for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) {
target = i;
tv_tpg = vs->vs_tpg[target];
if (!tv_tpg)
tpg = vs->vs_tpg[target];
if (!tpg)
continue;
mutex_lock(&tv_tpg->tv_tpg_mutex);
tv_tport = tv_tpg->tport;
mutex_lock(&tpg->tv_tpg_mutex);
tv_tport = tpg->tport;
if (!tv_tport) {
ret = -ENODEV;
goto err_tpg;
}
if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
pr_warn("tv_tport->tport_name: %s, tv_tpg->tport_tpgt: %hu"
pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu"
" does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
tv_tport->tport_name, tv_tpg->tport_tpgt,
tv_tport->tport_name, tpg->tport_tpgt,
t->vhost_wwpn, t->vhost_tpgt);
ret = -EINVAL;
goto err_tpg;
}
tv_tpg->tv_tpg_vhost_count--;
tv_tpg->vhost_scsi = NULL;
tpg->tv_tpg_vhost_count--;
tpg->vhost_scsi = NULL;
vs->vs_tpg[target] = NULL;
match = true;
mutex_unlock(&tv_tpg->tv_tpg_mutex);
mutex_unlock(&tpg->tv_tpg_mutex);
}
if (match) {
for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
@ -1311,7 +1326,7 @@ static int vhost_scsi_clear_endpoint(
return 0;
err_tpg:
mutex_unlock(&tv_tpg->tv_tpg_mutex);
mutex_unlock(&tpg->tv_tpg_mutex);
err_dev:
mutex_unlock(&vs->dev.mutex);
mutex_unlock(&tcm_vhost_mutex);
@ -1338,68 +1353,70 @@ static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)
static int vhost_scsi_open(struct inode *inode, struct file *f)
{
struct vhost_scsi *s;
struct vhost_scsi *vs;
struct vhost_virtqueue **vqs;
int r, i;
s = kzalloc(sizeof(*s), GFP_KERNEL);
if (!s)
vs = kzalloc(sizeof(*vs), GFP_KERNEL);
if (!vs)
return -ENOMEM;
vqs = kmalloc(VHOST_SCSI_MAX_VQ * sizeof(*vqs), GFP_KERNEL);
if (!vqs) {
kfree(s);
kfree(vs);
return -ENOMEM;
}
vhost_work_init(&s->vs_completion_work, vhost_scsi_complete_cmd_work);
vhost_work_init(&s->vs_event_work, tcm_vhost_evt_work);
vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work);
vhost_work_init(&vs->vs_event_work, tcm_vhost_evt_work);
s->vs_events_nr = 0;
s->vs_events_missed = false;
vs->vs_events_nr = 0;
vs->vs_events_missed = false;
vqs[VHOST_SCSI_VQ_CTL] = &s->vqs[VHOST_SCSI_VQ_CTL].vq;
vqs[VHOST_SCSI_VQ_EVT] = &s->vqs[VHOST_SCSI_VQ_EVT].vq;
s->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick;
s->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick;
vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq;
vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick;
vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick;
for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) {
vqs[i] = &s->vqs[i].vq;
s->vqs[i].vq.handle_kick = vhost_scsi_handle_kick;
vqs[i] = &vs->vqs[i].vq;
vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick;
}
r = vhost_dev_init(&s->dev, vqs, VHOST_SCSI_MAX_VQ);
r = vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ);
tcm_vhost_init_inflight(s, NULL);
tcm_vhost_init_inflight(vs, NULL);
if (r < 0) {
kfree(vqs);
kfree(s);
kfree(vs);
return r;
}
f->private_data = s;
f->private_data = vs;
return 0;
}
static int vhost_scsi_release(struct inode *inode, struct file *f)
{
struct vhost_scsi *s = f->private_data;
struct vhost_scsi *vs = f->private_data;
struct vhost_scsi_target t;
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);
mutex_lock(&vs->dev.mutex);
memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn));
mutex_unlock(&vs->dev.mutex);
vhost_scsi_clear_endpoint(vs, &t);
vhost_dev_stop(&vs->dev);
vhost_dev_cleanup(&vs->dev, false);
/* Jobs can re-queue themselves in evt kick handler. Do extra flush. */
vhost_scsi_flush(s);
kfree(s->dev.vqs);
kfree(s);
vhost_scsi_flush(vs);
kfree(vs->dev.vqs);
kfree(vs);
return 0;
}
static long vhost_scsi_ioctl(struct file *f, unsigned int ioctl,
unsigned long arg)
static long
vhost_scsi_ioctl(struct file *f,
unsigned int ioctl,
unsigned long arg)
{
struct vhost_scsi *vs = f->private_data;
struct vhost_scsi_target backend;
@ -1515,8 +1532,9 @@ static char *tcm_vhost_dump_proto_id(struct tcm_vhost_tport *tport)
return "Unknown";
}
static void tcm_vhost_do_plug(struct tcm_vhost_tpg *tpg,
struct se_lun *lun, bool plug)
static void
tcm_vhost_do_plug(struct tcm_vhost_tpg *tpg,
struct se_lun *lun, bool plug)
{
struct vhost_scsi *vs = tpg->vhost_scsi;
@ -1556,18 +1574,18 @@ static void tcm_vhost_hotunplug(struct tcm_vhost_tpg *tpg, struct se_lun *lun)
}
static int tcm_vhost_port_link(struct se_portal_group *se_tpg,
struct se_lun *lun)
struct se_lun *lun)
{
struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
struct tcm_vhost_tpg *tpg = container_of(se_tpg,
struct tcm_vhost_tpg, se_tpg);
mutex_lock(&tcm_vhost_mutex);
mutex_lock(&tv_tpg->tv_tpg_mutex);
tv_tpg->tv_tpg_port_count++;
mutex_unlock(&tv_tpg->tv_tpg_mutex);
mutex_lock(&tpg->tv_tpg_mutex);
tpg->tv_tpg_port_count++;
mutex_unlock(&tpg->tv_tpg_mutex);
tcm_vhost_hotplug(tv_tpg, lun);
tcm_vhost_hotplug(tpg, lun);
mutex_unlock(&tcm_vhost_mutex);
@ -1575,26 +1593,26 @@ static int tcm_vhost_port_link(struct se_portal_group *se_tpg,
}
static void tcm_vhost_port_unlink(struct se_portal_group *se_tpg,
struct se_lun *lun)
struct se_lun *lun)
{
struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
struct tcm_vhost_tpg *tpg = container_of(se_tpg,
struct tcm_vhost_tpg, se_tpg);
mutex_lock(&tcm_vhost_mutex);
mutex_lock(&tv_tpg->tv_tpg_mutex);
tv_tpg->tv_tpg_port_count--;
mutex_unlock(&tv_tpg->tv_tpg_mutex);
mutex_lock(&tpg->tv_tpg_mutex);
tpg->tv_tpg_port_count--;
mutex_unlock(&tpg->tv_tpg_mutex);
tcm_vhost_hotunplug(tv_tpg, lun);
tcm_vhost_hotunplug(tpg, lun);
mutex_unlock(&tcm_vhost_mutex);
}
static struct se_node_acl *tcm_vhost_make_nodeacl(
struct se_portal_group *se_tpg,
struct config_group *group,
const char *name)
static struct se_node_acl *
tcm_vhost_make_nodeacl(struct se_portal_group *se_tpg,
struct config_group *group,
const char *name)
{
struct se_node_acl *se_nacl, *se_nacl_new;
struct tcm_vhost_nacl *nacl;
@ -1635,23 +1653,23 @@ static void tcm_vhost_drop_nodeacl(struct se_node_acl *se_acl)
kfree(nacl);
}
static int tcm_vhost_make_nexus(struct tcm_vhost_tpg *tv_tpg,
const char *name)
static int tcm_vhost_make_nexus(struct tcm_vhost_tpg *tpg,
const char *name)
{
struct se_portal_group *se_tpg;
struct tcm_vhost_nexus *tv_nexus;
mutex_lock(&tv_tpg->tv_tpg_mutex);
if (tv_tpg->tpg_nexus) {
mutex_unlock(&tv_tpg->tv_tpg_mutex);
pr_debug("tv_tpg->tpg_nexus already exists\n");
mutex_lock(&tpg->tv_tpg_mutex);
if (tpg->tpg_nexus) {
mutex_unlock(&tpg->tv_tpg_mutex);
pr_debug("tpg->tpg_nexus already exists\n");
return -EEXIST;
}
se_tpg = &tv_tpg->se_tpg;
se_tpg = &tpg->se_tpg;
tv_nexus = kzalloc(sizeof(struct tcm_vhost_nexus), GFP_KERNEL);
if (!tv_nexus) {
mutex_unlock(&tv_tpg->tv_tpg_mutex);
mutex_unlock(&tpg->tv_tpg_mutex);
pr_err("Unable to allocate struct tcm_vhost_nexus\n");
return -ENOMEM;
}
@ -1660,7 +1678,7 @@ static int tcm_vhost_make_nexus(struct tcm_vhost_tpg *tv_tpg,
*/
tv_nexus->tvn_se_sess = transport_init_session();
if (IS_ERR(tv_nexus->tvn_se_sess)) {
mutex_unlock(&tv_tpg->tv_tpg_mutex);
mutex_unlock(&tpg->tv_tpg_mutex);
kfree(tv_nexus);
return -ENOMEM;
}
@ -1672,7 +1690,7 @@ static int tcm_vhost_make_nexus(struct tcm_vhost_tpg *tv_tpg,
tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
se_tpg, (unsigned char *)name);
if (!tv_nexus->tvn_se_sess->se_node_acl) {
mutex_unlock(&tv_tpg->tv_tpg_mutex);
mutex_unlock(&tpg->tv_tpg_mutex);
pr_debug("core_tpg_check_initiator_node_acl() failed"
" for %s\n", name);
transport_free_session(tv_nexus->tvn_se_sess);
@ -1685,9 +1703,9 @@ static int tcm_vhost_make_nexus(struct tcm_vhost_tpg *tv_tpg,
*/
__transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
tv_nexus->tvn_se_sess, tv_nexus);
tv_tpg->tpg_nexus = tv_nexus;
tpg->tpg_nexus = tv_nexus;
mutex_unlock(&tv_tpg->tv_tpg_mutex);
mutex_unlock(&tpg->tv_tpg_mutex);
return 0;
}
@ -1740,40 +1758,40 @@ static int tcm_vhost_drop_nexus(struct tcm_vhost_tpg *tpg)
}
static ssize_t tcm_vhost_tpg_show_nexus(struct se_portal_group *se_tpg,
char *page)
char *page)
{
struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
struct tcm_vhost_tpg *tpg = container_of(se_tpg,
struct tcm_vhost_tpg, se_tpg);
struct tcm_vhost_nexus *tv_nexus;
ssize_t ret;
mutex_lock(&tv_tpg->tv_tpg_mutex);
tv_nexus = tv_tpg->tpg_nexus;
mutex_lock(&tpg->tv_tpg_mutex);
tv_nexus = tpg->tpg_nexus;
if (!tv_nexus) {
mutex_unlock(&tv_tpg->tv_tpg_mutex);
mutex_unlock(&tpg->tv_tpg_mutex);
return -ENODEV;
}
ret = snprintf(page, PAGE_SIZE, "%s\n",
tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
mutex_unlock(&tv_tpg->tv_tpg_mutex);
mutex_unlock(&tpg->tv_tpg_mutex);
return ret;
}
static ssize_t tcm_vhost_tpg_store_nexus(struct se_portal_group *se_tpg,
const char *page,
size_t count)
const char *page,
size_t count)
{
struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
struct tcm_vhost_tpg *tpg = container_of(se_tpg,
struct tcm_vhost_tpg, se_tpg);
struct tcm_vhost_tport *tport_wwn = tv_tpg->tport;
struct tcm_vhost_tport *tport_wwn = tpg->tport;
unsigned char i_port[TCM_VHOST_NAMELEN], *ptr, *port_ptr;
int ret;
/*
* Shutdown the active I_T nexus if 'NULL' is passed..
*/
if (!strncmp(page, "NULL", 4)) {
ret = tcm_vhost_drop_nexus(tv_tpg);
ret = tcm_vhost_drop_nexus(tpg);
return (!ret) ? count : ret;
}
/*
@ -1831,7 +1849,7 @@ check_newline:
if (i_port[strlen(i_port)-1] == '\n')
i_port[strlen(i_port)-1] = '\0';
ret = tcm_vhost_make_nexus(tv_tpg, port_ptr);
ret = tcm_vhost_make_nexus(tpg, port_ptr);
if (ret < 0)
return ret;
@ -1845,9 +1863,10 @@ static struct configfs_attribute *tcm_vhost_tpg_attrs[] = {
NULL,
};
static struct se_portal_group *tcm_vhost_make_tpg(struct se_wwn *wwn,
struct config_group *group,
const char *name)
static struct se_portal_group *
tcm_vhost_make_tpg(struct se_wwn *wwn,
struct config_group *group,
const char *name)
{
struct tcm_vhost_tport *tport = container_of(wwn,
struct tcm_vhost_tport, tport_wwn);
@ -1903,9 +1922,10 @@ static void tcm_vhost_drop_tpg(struct se_portal_group *se_tpg)
kfree(tpg);
}
static struct se_wwn *tcm_vhost_make_tport(struct target_fabric_configfs *tf,
struct config_group *group,
const char *name)
static struct se_wwn *
tcm_vhost_make_tport(struct target_fabric_configfs *tf,
struct config_group *group,
const char *name)
{
struct tcm_vhost_tport *tport;
char *ptr;
@ -1975,9 +1995,9 @@ static void tcm_vhost_drop_tport(struct se_wwn *wwn)
kfree(tport);
}
static ssize_t tcm_vhost_wwn_show_attr_version(
struct target_fabric_configfs *tf,
char *page)
static ssize_t
tcm_vhost_wwn_show_attr_version(struct target_fabric_configfs *tf,
char *page)
{
return sprintf(page, "TCM_VHOST fabric module %s on %s/%s"
"on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname,

35
drivers/vhost/test.c
View File

@ -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. */
@ -38,17 +38,19 @@ struct vhost_test {
* 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->vqs[VHOST_TEST_VQ];
unsigned out, in;
int head;
size_t len, total_len = 0;
void *private;
private = rcu_dereference_check(vq->private_data, 1);
if (!private)
return;
mutex_lock(&vq->mutex);
private = vq->private_data;
if (!private) {
mutex_unlock(&vq->mutex);
return;
}
vhost_disable_notify(&n->dev, vq);
for (;;) {
@ -102,15 +104,23 @@ static int vhost_test_open(struct inode *inode, struct file *f)
{
struct vhost_test *n = kmalloc(sizeof *n, GFP_KERNEL);
struct vhost_dev *dev;
struct vhost_virtqueue **vqs;
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;
vqs[VHOST_TEST_VQ] = &n->vqs[VHOST_TEST_VQ];
n->vqs[VHOST_TEST_VQ].handle_kick = handle_vq_kick;
r = vhost_dev_init(dev, n->vqs, VHOST_TEST_VQ_MAX);
r = vhost_dev_init(dev, vqs, VHOST_TEST_VQ_MAX);
if (r < 0) {
kfree(vqs);
kfree(n);
return r;
}
@ -126,9 +136,8 @@ static void *vhost_test_stop_vq(struct vhost_test *n,
void *private;
mutex_lock(&vq->mutex);
private = rcu_dereference_protected(vq->private_data,
lockdep_is_held(&vq->mutex));
rcu_assign_pointer(vq->private_data, NULL);
private = vq->private_data;
vq->private_data = NULL;
mutex_unlock(&vq->mutex);
return private;
}
@ -140,7 +149,7 @@ static void vhost_test_stop(struct vhost_test *n, void **privatep)
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].poll);
}
static void vhost_test_flush(struct vhost_test *n)
@ -268,14 +277,14 @@ 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:

86
drivers/vhost/vhost.c
View File

@ -25,6 +25,7 @@
#include <linux/slab.h>
#include <linux/kthread.h>
#include <linux/cgroup.h>
#include <linux/module.h>
#include "vhost.h"
@ -66,6 +67,7 @@ void vhost_work_init(struct vhost_work *work, vhost_work_fn_t fn)
work->flushing = 0;
work->queue_seq = work->done_seq = 0;
}
EXPORT_SYMBOL_GPL(vhost_work_init);
/* Init poll structure */
void vhost_poll_init(struct vhost_poll *poll, vhost_work_fn_t fn,
@ -79,6 +81,7 @@ void vhost_poll_init(struct vhost_poll *poll, vhost_work_fn_t fn,
vhost_work_init(&poll->work, fn);
}
EXPORT_SYMBOL_GPL(vhost_poll_init);
/* Start polling a file. We add ourselves to file's wait queue. The caller must
* keep a reference to a file until after vhost_poll_stop is called. */
@ -101,6 +104,7 @@ int vhost_poll_start(struct vhost_poll *poll, struct file *file)
return ret;
}
EXPORT_SYMBOL_GPL(vhost_poll_start);
/* Stop polling a file. After this function returns, it becomes safe to drop the
* file reference. You must also flush afterwards. */
@ -111,6 +115,7 @@ void vhost_poll_stop(struct vhost_poll *poll)
poll->wqh = NULL;
}
}
EXPORT_SYMBOL_GPL(vhost_poll_stop);
static bool vhost_work_seq_done(struct vhost_dev *dev, struct vhost_work *work,
unsigned seq)
@ -123,7 +128,7 @@ static bool vhost_work_seq_done(struct vhost_dev *dev, struct vhost_work *work,
return left <= 0;
}
static void vhost_work_flush(struct vhost_dev *dev, struct vhost_work *work)
void vhost_work_flush(struct vhost_dev *dev, struct vhost_work *work)
{
unsigned seq;
int flushing;
@ -138,6 +143,7 @@ static void vhost_work_flush(struct vhost_dev *dev, struct vhost_work *work)
spin_unlock_irq(&dev->work_lock);
BUG_ON(flushing < 0);
}
EXPORT_SYMBOL_GPL(vhost_work_flush);
/* Flush any work that has been scheduled. When calling this, don't hold any
* locks that are also used by the callback. */
@ -145,6 +151,7 @@ void vhost_poll_flush(struct vhost_poll *poll)
{
vhost_work_flush(poll->dev, &poll->work);
}
EXPORT_SYMBOL_GPL(vhost_poll_flush);
void vhost_work_queue(struct vhost_dev *dev, struct vhost_work *work)
{
@ -158,11 +165,13 @@ void vhost_work_queue(struct vhost_dev *dev, struct vhost_work *work)
}
spin_unlock_irqrestore(&dev->work_lock, flags);
}
EXPORT_SYMBOL_GPL(vhost_work_queue);
void vhost_poll_queue(struct vhost_poll *poll)
{
vhost_work_queue(poll->dev, &poll->work);
}
EXPORT_SYMBOL_GPL(vhost_poll_queue);
static void vhost_vq_reset(struct vhost_dev *dev,
struct vhost_virtqueue *vq)
@ -251,17 +260,16 @@ static void vhost_vq_free_iovecs(struct vhost_virtqueue *vq)
/* Helper to allocate iovec buffers for all vqs. */
static long vhost_dev_alloc_iovecs(struct vhost_dev *dev)
{
struct vhost_virtqueue *vq;
int i;
for (i = 0; i < dev->nvqs; ++i) {
dev->vqs[i]->indirect = kmalloc(sizeof *dev->vqs[i]->indirect *
UIO_MAXIOV, GFP_KERNEL);
dev->vqs[i]->log = kmalloc(sizeof *dev->vqs[i]->log * UIO_MAXIOV,
GFP_KERNEL);
dev->vqs[i]->heads = kmalloc(sizeof *dev->vqs[i]->heads *
UIO_MAXIOV, GFP_KERNEL);
if (!dev->vqs[i]->indirect || !dev->vqs[i]->log ||
!dev->vqs[i]->heads)
vq = dev->vqs[i];
vq->indirect = kmalloc(sizeof *vq->indirect * UIO_MAXIOV,
GFP_KERNEL);
vq->log = kmalloc(sizeof *vq->log * UIO_MAXIOV, GFP_KERNEL);
vq->heads = kmalloc(sizeof *vq->heads * UIO_MAXIOV, GFP_KERNEL);
if (!vq->indirect || !vq->log || !vq->heads)
goto err_nomem;
}
return 0;
@ -283,6 +291,7 @@ static void vhost_dev_free_iovecs(struct vhost_dev *dev)
long vhost_dev_init(struct vhost_dev *dev,
struct vhost_virtqueue **vqs, int nvqs)
{
struct vhost_virtqueue *vq;
int i;
dev->vqs = vqs;
@ -297,19 +306,21 @@ long vhost_dev_init(struct vhost_dev *dev,
dev->worker = NULL;
for (i = 0; i < dev->nvqs; ++i) {
dev->vqs[i]->log = NULL;
dev->vqs[i]->indirect = NULL;
dev->vqs[i]->heads = NULL;
dev->vqs[i]->dev = dev;
mutex_init(&dev->vqs[i]->mutex);
vhost_vq_reset(dev, dev->vqs[i]);
if (dev->vqs[i]->handle_kick)
vhost_poll_init(&dev->vqs[i]->poll,
dev->vqs[i]->handle_kick, POLLIN, dev);
vq = dev->vqs[i];
vq->log = NULL;
vq->indirect = NULL;
vq->heads = NULL;
vq->dev = dev;
mutex_init(&vq->mutex);
vhost_vq_reset(dev, vq);
if (vq->handle_kick)
vhost_poll_init(&vq->poll, vq->handle_kick,
POLLIN, dev);
}
return 0;
}
EXPORT_SYMBOL_GPL(vhost_dev_init);
/* Caller should have device mutex */
long vhost_dev_check_owner(struct vhost_dev *dev)
@ -317,6 +328,7 @@ long vhost_dev_check_owner(struct vhost_dev *dev)
/* Are you the owner? If not, I don't think you mean to do that */
return dev->mm == current->mm ? 0 : -EPERM;
}
EXPORT_SYMBOL_GPL(vhost_dev_check_owner);
struct vhost_attach_cgroups_struct {
struct vhost_work work;
@ -348,6 +360,7 @@ bool vhost_dev_has_owner(struct vhost_dev *dev)
{
return dev->mm;
}
EXPORT_SYMBOL_GPL(vhost_dev_has_owner);
/* Caller should have device mutex */
long vhost_dev_set_owner(struct vhost_dev *dev)
@ -391,11 +404,13 @@ err_worker:
err_mm:
return err;
}
EXPORT_SYMBOL_GPL(vhost_dev_set_owner);
struct vhost_memory *vhost_dev_reset_owner_prepare(void)
{
return kmalloc(offsetof(struct vhost_memory, regions), GFP_KERNEL);
}
EXPORT_SYMBOL_GPL(vhost_dev_reset_owner_prepare);
/* Caller should have device mutex */
void vhost_dev_reset_owner(struct vhost_dev *dev, struct vhost_memory *memory)
@ -406,6 +421,7 @@ void vhost_dev_reset_owner(struct vhost_dev *dev, struct vhost_memory *memory)
memory->nregions = 0;
RCU_INIT_POINTER(dev->memory, memory);
}
EXPORT_SYMBOL_GPL(vhost_dev_reset_owner);
void vhost_dev_stop(struct vhost_dev *dev)
{
@ -418,6 +434,7 @@ void vhost_dev_stop(struct vhost_dev *dev)
}
}
}
EXPORT_SYMBOL_GPL(vhost_dev_stop);
/* Caller should have device mutex if and only if locked is set */
void vhost_dev_cleanup(struct vhost_dev *dev, bool locked)
@ -458,6 +475,7 @@ void vhost_dev_cleanup(struct vhost_dev *dev, bool locked)
mmput(dev->mm);
dev->mm = NULL;
}
EXPORT_SYMBOL_GPL(vhost_dev_cleanup);
static int log_access_ok(void __user *log_base, u64 addr, unsigned long sz)
{
@ -543,6 +561,7 @@ int vhost_log_access_ok(struct vhost_dev *dev)
lockdep_is_held(&dev->mutex));
return memory_access_ok(dev, mp, 1);
}
EXPORT_SYMBOL_GPL(vhost_log_access_ok);
/* Verify access for write logging. */
/* Caller should have vq mutex and device mutex */
@ -568,6 +587,7 @@ int vhost_vq_access_ok(struct vhost_virtqueue *vq)
return vq_access_ok(vq->dev, vq->num, vq->desc, vq->avail, vq->used) &&
vq_log_access_ok(vq->dev, vq, vq->log_base);
}
EXPORT_SYMBOL_GPL(vhost_vq_access_ok);
static long vhost_set_memory(struct vhost_dev *d, struct vhost_memory __user *m)
{
@ -797,6 +817,7 @@ long vhost_vring_ioctl(struct vhost_dev *d, int ioctl, void __user *argp)
vhost_poll_flush(&vq->poll);
return r;
}
EXPORT_SYMBOL_GPL(vhost_vring_ioctl);
/* Caller must have device mutex */
long vhost_dev_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *argp)
@ -877,6 +898,7 @@ long vhost_dev_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *argp)
done:
return r;
}
EXPORT_SYMBOL_GPL(vhost_dev_ioctl);
static const struct vhost_memory_region *find_region(struct vhost_memory *mem,
__u64 addr, __u32 len)
@ -968,6 +990,7 @@ int vhost_log_write(struct vhost_virtqueue *vq, struct vhost_log *log,
BUG();
return 0;
}
EXPORT_SYMBOL_GPL(vhost_log_write);
static int vhost_update_used_flags(struct vhost_virtqueue *vq)
{
@ -1019,6 +1042,7 @@ int vhost_init_used(struct vhost_virtqueue *vq)
vq->signalled_used_valid = false;
return get_user(vq->last_used_idx, &vq->used->idx);
}
EXPORT_SYMBOL_GPL(vhost_init_used);
static int translate_desc(struct vhost_dev *dev, u64 addr, u32 len,
struct iovec iov[], int iov_size)
@ -1295,12 +1319,14 @@ int vhost_get_vq_desc(struct vhost_dev *dev, struct vhost_virtqueue *vq,
BUG_ON(!(vq->used_flags & VRING_USED_F_NO_NOTIFY));
return head;
}
EXPORT_SYMBOL_GPL(vhost_get_vq_desc);
/* Reverse the effect of vhost_get_vq_desc. Useful for error handling. */
void vhost_discard_vq_desc(struct vhost_virtqueue *vq, int n)
{
vq->last_avail_idx -= n;
}
EXPORT_SYMBOL_GPL(vhost_discard_vq_desc);
/* After we've used one of their buffers, we tell them about it. We'll then
* want to notify the guest, using eventfd. */
@ -1349,6 +1375,7 @@ int vhost_add_used(struct vhost_virtqueue *vq, unsigned int head, int len)
vq->signalled_used_valid = false;
return 0;
}
EXPORT_SYMBOL_GPL(vhost_add_used);
static int __vhost_add_used_n(struct vhost_virtqueue *vq,
struct vring_used_elem *heads,
@ -1418,6 +1445,7 @@ int vhost_add_used_n(struct vhost_virtqueue *vq, struct vring_used_elem *heads,
}
return r;
}
EXPORT_SYMBOL_GPL(vhost_add_used_n);
static bool vhost_notify(struct vhost_dev *dev, struct vhost_virtqueue *vq)
{
@ -1462,6 +1490,7 @@ void vhost_signal(struct vhost_dev *dev, struct vhost_virtqueue *vq)
if (vq->call_ctx && vhost_notify(dev, vq))
eventfd_signal(vq->call_ctx, 1);
}
EXPORT_SYMBOL_GPL(vhost_signal);
/* And here's the combo meal deal. Supersize me! */
void vhost_add_used_and_signal(struct vhost_dev *dev,
@ -1471,6 +1500,7 @@ void vhost_add_used_and_signal(struct vhost_dev *dev,
vhost_add_used(vq, head, len);
vhost_signal(dev, vq);
}
EXPORT_SYMBOL_GPL(vhost_add_used_and_signal);
/* multi-buffer version of vhost_add_used_and_signal */
void vhost_add_used_and_signal_n(struct vhost_dev *dev,
@ -1480,6 +1510,7 @@ void vhost_add_used_and_signal_n(struct vhost_dev *dev,
vhost_add_used_n(vq, heads, count);
vhost_signal(dev, vq);
}
EXPORT_SYMBOL_GPL(vhost_add_used_and_signal_n);
/* OK, now we need to know about added descriptors. */
bool vhost_enable_notify(struct vhost_dev *dev, struct vhost_virtqueue *vq)
@ -1517,6 +1548,7 @@ bool vhost_enable_notify(struct vhost_dev *dev, struct vhost_virtqueue *vq)
return avail_idx != vq->avail_idx;
}
EXPORT_SYMBOL_GPL(vhost_enable_notify);
/* We don't need to be notified again. */
void vhost_disable_notify(struct vhost_dev *dev, struct vhost_virtqueue *vq)
@ -1533,3 +1565,21 @@ void vhost_disable_notify(struct vhost_dev *dev, struct vhost_virtqueue *vq)
&vq->used->flags, r);
}
}
EXPORT_SYMBOL_GPL(vhost_disable_notify);
static int __init vhost_init(void)
{
return 0;
}
static void __exit vhost_exit(void)
{
}
module_init(vhost_init);
module_exit(vhost_exit);
MODULE_VERSION("0.0.1");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Michael S. Tsirkin");
MODULE_DESCRIPTION("Host kernel accelerator for virtio");

2
drivers/vhost/vhost.h
View File

@ -46,6 +46,8 @@ int vhost_poll_start(struct vhost_poll *poll, struct file *file);
void vhost_poll_stop(struct vhost_poll *poll);
void vhost_poll_flush(struct vhost_poll *poll);
void vhost_poll_queue(struct vhost_poll *poll);
void vhost_work_flush(struct vhost_dev *dev, struct vhost_work *work);
long vhost_vring_ioctl(struct vhost_dev *d, int ioctl, void __user *argp);
struct vhost_log {
u64 addr;