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[IB] uverbs: ABI-breaking fixes for userspace verbs

Browse source 
Introduce new userspace verbs ABI version 3.  This eliminates some
unneeded commands, and adds support for user-created completion
channels.  This cleans up problems with file leaks on error paths, and
also makes sure that file descriptors are always installed into the
correct process.

Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Roland Dreier 2005-09-26 13:53:25 -07:00
parent 33033b7972
commit 6b73597e70
4 changed files with 258 additions and 296 deletions
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18
drivers/infiniband/core/uverbs.h
View file

@ -53,14 +53,14 @@ struct ib_uverbs_device {
struct cdev dev;
struct class_device class_dev;
struct ib_device *ib_dev;
int num_comp;
int num_comp_vectors;
};
struct ib_uverbs_event_file {
struct kref ref;
struct file *file;
struct ib_uverbs_file *uverbs_file;
spinlock_t lock;
int fd;
int is_async;
wait_queue_head_t poll_wait;
struct fasync_struct *async_queue;
@ -73,8 +73,7 @@ struct ib_uverbs_file {
struct ib_uverbs_device *device;
struct ib_ucontext *ucontext;
struct ib_event_handler event_handler;
struct ib_uverbs_event_file async_file;
struct ib_uverbs_event_file comp_file[1];
struct ib_uverbs_event_file *async_file;
};
struct ib_uverbs_event {
@ -110,10 +109,17 @@ extern struct idr ib_uverbs_cq_idr;
extern struct idr ib_uverbs_qp_idr;
extern struct idr ib_uverbs_srq_idr;
struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
int is_async, int *fd);
void ib_uverbs_release_event_file(struct kref *ref);
struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd);
void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context);
void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr);
void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr);
void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr);
void ib_uverbs_event_handler(struct ib_event_handler *handler,
struct ib_event *event);
int ib_umem_get(struct ib_device *dev, struct ib_umem *mem,
void *addr, size_t size, int write);
@ -125,16 +131,14 @@ void ib_umem_release_on_close(struct ib_device *dev, struct ib_umem *umem);
const char __user *buf, int in_len, \
int out_len)
IB_UVERBS_DECLARE_CMD(query_params);
IB_UVERBS_DECLARE_CMD(get_context);
IB_UVERBS_DECLARE_CMD(query_device);
IB_UVERBS_DECLARE_CMD(query_port);
IB_UVERBS_DECLARE_CMD(query_gid);
IB_UVERBS_DECLARE_CMD(query_pkey);
IB_UVERBS_DECLARE_CMD(alloc_pd);
IB_UVERBS_DECLARE_CMD(dealloc_pd);
IB_UVERBS_DECLARE_CMD(reg_mr);
IB_UVERBS_DECLARE_CMD(dereg_mr);
IB_UVERBS_DECLARE_CMD(create_comp_channel);
IB_UVERBS_DECLARE_CMD(create_cq);
IB_UVERBS_DECLARE_CMD(destroy_cq);
IB_UVERBS_DECLARE_CMD(create_qp);

188
drivers/infiniband/core/uverbs_cmd.c
View file

@ -33,6 +33,8 @@
* $Id: uverbs_cmd.c 2708 2005-06-24 17:27:21Z roland $
*/
#include <linux/file.h>
#include <asm/uaccess.h>
#include "uverbs.h"
@ -45,29 +47,6 @@
(udata)->outlen = (olen); \
} while (0)
ssize_t ib_uverbs_query_params(struct ib_uverbs_file *file,
const char __user *buf,
int in_len, int out_len)
{
struct ib_uverbs_query_params cmd;
struct ib_uverbs_query_params_resp resp;
if (out_len < sizeof resp)
return -ENOSPC;
if (copy_from_user(&cmd, buf, sizeof cmd))
return -EFAULT;
memset(&resp, 0, sizeof resp);
resp.num_cq_events = file->device->num_comp;
if (copy_to_user((void __user *) (unsigned long) cmd.response, &resp, sizeof resp))
return -EFAULT;
return in_len;
}
ssize_t ib_uverbs_get_context(struct ib_uverbs_file *file,
const char __user *buf,
int in_len, int out_len)
@ -77,7 +56,7 @@ ssize_t ib_uverbs_get_context(struct ib_uverbs_file *file,
struct ib_udata udata;
struct ib_device *ibdev = file->device->ib_dev;
struct ib_ucontext *ucontext;
int i;
struct file *filp;
int ret;
if (out_len < sizeof resp)
@ -110,26 +89,42 @@ ssize_t ib_uverbs_get_context(struct ib_uverbs_file *file,
INIT_LIST_HEAD(&ucontext->srq_list);
INIT_LIST_HEAD(&ucontext->ah_list);
resp.async_fd = file->async_file.fd;
for (i = 0; i < file->device->num_comp; ++i)
if (copy_to_user((void __user *) (unsigned long) cmd.cq_fd_tab +
i * sizeof (__u32),
&file->comp_file[i].fd, sizeof (__u32))) {
ret = -EFAULT;
goto err_free;
}
resp.num_comp_vectors = file->device->num_comp_vectors;
filp = ib_uverbs_alloc_event_file(file, 1, &resp.async_fd);
if (IS_ERR(filp)) {
ret = PTR_ERR(filp);
goto err_free;
}
if (copy_to_user((void __user *) (unsigned long) cmd.response,
&resp, sizeof resp)) {
ret = -EFAULT;
goto err_free;
goto err_file;
}
file->ucontext = ucontext;
file->async_file = filp->private_data;
INIT_IB_EVENT_HANDLER(&file->event_handler, file->device->ib_dev,
ib_uverbs_event_handler);
ret = ib_register_event_handler(&file->event_handler);
if (ret)
goto err_file;
kref_get(&file->async_file->ref);
kref_get(&file->ref);
file->ucontext = ucontext;
fd_install(resp.async_fd, filp);
up(&file->mutex);
return in_len;
err_file:
put_unused_fd(resp.async_fd);
fput(filp);
err_free:
ibdev->dealloc_ucontext(ucontext);
@ -255,62 +250,6 @@ ssize_t ib_uverbs_query_port(struct ib_uverbs_file *file,
return in_len;
}
ssize_t ib_uverbs_query_gid(struct ib_uverbs_file *file,
const char __user *buf,
int in_len, int out_len)
{
struct ib_uverbs_query_gid cmd;
struct ib_uverbs_query_gid_resp resp;
int ret;
if (out_len < sizeof resp)
return -ENOSPC;
if (copy_from_user(&cmd, buf, sizeof cmd))
return -EFAULT;
memset(&resp, 0, sizeof resp);
ret = ib_query_gid(file->device->ib_dev, cmd.port_num, cmd.index,
(union ib_gid *) resp.gid);
if (ret)
return ret;
if (copy_to_user((void __user *) (unsigned long) cmd.response,
&resp, sizeof resp))
return -EFAULT;
return in_len;
}
ssize_t ib_uverbs_query_pkey(struct ib_uverbs_file *file,
const char __user *buf,
int in_len, int out_len)
{
struct ib_uverbs_query_pkey cmd;
struct ib_uverbs_query_pkey_resp resp;
int ret;
if (out_len < sizeof resp)
return -ENOSPC;
if (copy_from_user(&cmd, buf, sizeof cmd))
return -EFAULT;
memset(&resp, 0, sizeof resp);
ret = ib_query_pkey(file->device->ib_dev, cmd.port_num, cmd.index,
&resp.pkey);
if (ret)
return ret;
if (copy_to_user((void __user *) (unsigned long) cmd.response,
&resp, sizeof resp))
return -EFAULT;
return in_len;
}
ssize_t ib_uverbs_alloc_pd(struct ib_uverbs_file *file,
const char __user *buf,
int in_len, int out_len)
@ -595,6 +534,35 @@ out:
return ret ? ret : in_len;
}
ssize_t ib_uverbs_create_comp_channel(struct ib_uverbs_file *file,
const char __user *buf, int in_len,
int out_len)
{
struct ib_uverbs_create_comp_channel cmd;
struct ib_uverbs_create_comp_channel_resp resp;
struct file *filp;
if (out_len < sizeof resp)
return -ENOSPC;
if (copy_from_user(&cmd, buf, sizeof cmd))
return -EFAULT;
filp = ib_uverbs_alloc_event_file(file, 0, &resp.fd);
if (IS_ERR(filp))
return PTR_ERR(filp);
if (copy_to_user((void __user *) (unsigned long) cmd.response,
&resp, sizeof resp)) {
put_unused_fd(resp.fd);
fput(filp);
return -EFAULT;
}
fd_install(resp.fd, filp);
return in_len;
}
ssize_t ib_uverbs_create_cq(struct ib_uverbs_file *file,
const char __user *buf, int in_len,
int out_len)
@ -603,6 +571,7 @@ ssize_t ib_uverbs_create_cq(struct ib_uverbs_file *file,
struct ib_uverbs_create_cq_resp resp;
struct ib_udata udata;
struct ib_ucq_object *uobj;
struct ib_uverbs_event_file *ev_file = NULL;
struct ib_cq *cq;
int ret;
@ -616,9 +585,12 @@ ssize_t ib_uverbs_create_cq(struct ib_uverbs_file *file,
(unsigned long) cmd.response + sizeof resp,
in_len - sizeof cmd, out_len - sizeof resp);
if (cmd.event_handler >= file->device->num_comp)
if (cmd.comp_vector >= file->device->num_comp_vectors)
return -EINVAL;
if (cmd.comp_channel >= 0)
ev_file = ib_uverbs_lookup_comp_file(cmd.comp_channel);
uobj = kmalloc(sizeof *uobj, GFP_KERNEL);
if (!uobj)
return -ENOMEM;
@ -641,7 +613,7 @@ ssize_t ib_uverbs_create_cq(struct ib_uverbs_file *file,
cq->uobject = &uobj->uobject;
cq->comp_handler = ib_uverbs_comp_handler;
cq->event_handler = ib_uverbs_cq_event_handler;
cq->cq_context = file;
cq->cq_context = ev_file;
atomic_set(&cq->usecnt, 0);
retry:
@ -700,6 +672,7 @@ ssize_t ib_uverbs_destroy_cq(struct ib_uverbs_file *file,
struct ib_uverbs_destroy_cq_resp resp;
struct ib_cq *cq;
struct ib_ucq_object *uobj;
struct ib_uverbs_event_file *ev_file;
struct ib_uverbs_event *evt, *tmp;
u64 user_handle;
int ret = -EINVAL;
@ -716,7 +689,8 @@ ssize_t ib_uverbs_destroy_cq(struct ib_uverbs_file *file,
goto out;
user_handle = cq->uobject->user_handle;
uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
ev_file = cq->cq_context;
ret = ib_destroy_cq(cq);
if (ret)
@ -728,19 +702,23 @@ ssize_t ib_uverbs_destroy_cq(struct ib_uverbs_file *file,
list_del(&uobj->uobject.list);
up(&file->mutex);
spin_lock_irq(&file->comp_file[0].lock);
list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
list_del(&evt->list);
kfree(evt);
}
spin_unlock_irq(&file->comp_file[0].lock);
if (ev_file) {
spin_lock_irq(&ev_file->lock);
list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
list_del(&evt->list);
kfree(evt);
}
spin_unlock_irq(&ev_file->lock);
spin_lock_irq(&file->async_file.lock);
kref_put(&ev_file->ref, ib_uverbs_release_event_file);
}
spin_lock_irq(&file->async_file->lock);
list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
list_del(&evt->list);
kfree(evt);
}
spin_unlock_irq(&file->async_file.lock);
spin_unlock_irq(&file->async_file->lock);
resp.comp_events_reported = uobj->comp_events_reported;
resp.async_events_reported = uobj->async_events_reported;
@ -1005,12 +983,12 @@ ssize_t ib_uverbs_destroy_qp(struct ib_uverbs_file *file,
list_del(&uobj->uobject.list);
up(&file->mutex);
spin_lock_irq(&file->async_file.lock);
spin_lock_irq(&file->async_file->lock);
list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
list_del(&evt->list);
kfree(evt);
}
spin_unlock_irq(&file->async_file.lock);
spin_unlock_irq(&file->async_file->lock);
resp.events_reported = uobj->events_reported;
@ -1243,12 +1221,12 @@ ssize_t ib_uverbs_destroy_srq(struct ib_uverbs_file *file,
list_del(&uobj->uobject.list);
up(&file->mutex);
spin_lock_irq(&file->async_file.lock);
spin_lock_irq(&file->async_file->lock);
list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
list_del(&evt->list);
kfree(evt);
}
spin_unlock_irq(&file->async_file.lock);
spin_unlock_irq(&file->async_file->lock);
resp.events_reported = uobj->events_reported;

290
drivers/infiniband/core/uverbs_main.c
View file

@ -77,26 +77,24 @@ static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
const char __user *buf, int in_len,
int out_len) = {
[IB_USER_VERBS_CMD_QUERY_PARAMS] = ib_uverbs_query_params,
[IB_USER_VERBS_CMD_GET_CONTEXT] = ib_uverbs_get_context,
[IB_USER_VERBS_CMD_QUERY_DEVICE] = ib_uverbs_query_device,
[IB_USER_VERBS_CMD_QUERY_PORT] = ib_uverbs_query_port,
[IB_USER_VERBS_CMD_QUERY_GID] = ib_uverbs_query_gid,
[IB_USER_VERBS_CMD_QUERY_PKEY] = ib_uverbs_query_pkey,
[IB_USER_VERBS_CMD_ALLOC_PD] = ib_uverbs_alloc_pd,
[IB_USER_VERBS_CMD_DEALLOC_PD] = ib_uverbs_dealloc_pd,
[IB_USER_VERBS_CMD_REG_MR] = ib_uverbs_reg_mr,
[IB_USER_VERBS_CMD_DEREG_MR] = ib_uverbs_dereg_mr,
[IB_USER_VERBS_CMD_CREATE_CQ] = ib_uverbs_create_cq,
[IB_USER_VERBS_CMD_DESTROY_CQ] = ib_uverbs_destroy_cq,
[IB_USER_VERBS_CMD_CREATE_QP] = ib_uverbs_create_qp,
[IB_USER_VERBS_CMD_MODIFY_QP] = ib_uverbs_modify_qp,
[IB_USER_VERBS_CMD_DESTROY_QP] = ib_uverbs_destroy_qp,
[IB_USER_VERBS_CMD_ATTACH_MCAST] = ib_uverbs_attach_mcast,
[IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast,
[IB_USER_VERBS_CMD_CREATE_SRQ] = ib_uverbs_create_srq,
[IB_USER_VERBS_CMD_MODIFY_SRQ] = ib_uverbs_modify_srq,
[IB_USER_VERBS_CMD_DESTROY_SRQ] = ib_uverbs_destroy_srq,
[IB_USER_VERBS_CMD_GET_CONTEXT] = ib_uverbs_get_context,
[IB_USER_VERBS_CMD_QUERY_DEVICE] = ib_uverbs_query_device,
[IB_USER_VERBS_CMD_QUERY_PORT] = ib_uverbs_query_port,
[IB_USER_VERBS_CMD_ALLOC_PD] = ib_uverbs_alloc_pd,
[IB_USER_VERBS_CMD_DEALLOC_PD] = ib_uverbs_dealloc_pd,
[IB_USER_VERBS_CMD_REG_MR] = ib_uverbs_reg_mr,
[IB_USER_VERBS_CMD_DEREG_MR] = ib_uverbs_dereg_mr,
[IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
[IB_USER_VERBS_CMD_CREATE_CQ] = ib_uverbs_create_cq,
[IB_USER_VERBS_CMD_DESTROY_CQ] = ib_uverbs_destroy_cq,
[IB_USER_VERBS_CMD_CREATE_QP] = ib_uverbs_create_qp,
[IB_USER_VERBS_CMD_MODIFY_QP] = ib_uverbs_modify_qp,
[IB_USER_VERBS_CMD_DESTROY_QP] = ib_uverbs_destroy_qp,
[IB_USER_VERBS_CMD_ATTACH_MCAST] = ib_uverbs_attach_mcast,
[IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast,
[IB_USER_VERBS_CMD_CREATE_SRQ] = ib_uverbs_create_srq,
[IB_USER_VERBS_CMD_MODIFY_SRQ] = ib_uverbs_modify_srq,
[IB_USER_VERBS_CMD_DESTROY_SRQ] = ib_uverbs_destroy_srq,
};
static struct vfsmount *uverbs_event_mnt;
@ -188,25 +186,19 @@ static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
spin_lock_irq(&file->lock);
while (list_empty(&file->event_list) && file->fd >= 0) {
while (list_empty(&file->event_list)) {
spin_unlock_irq(&file->lock);
if (filp->f_flags & O_NONBLOCK)
return -EAGAIN;
if (wait_event_interruptible(file->poll_wait,
!list_empty(&file->event_list) ||
file->fd < 0))
!list_empty(&file->event_list)))
return -ERESTARTSYS;
spin_lock_irq(&file->lock);
}
if (file->fd < 0) {
spin_unlock_irq(&file->lock);
return -ENODEV;
}
event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
if (file->is_async)
@ -248,26 +240,19 @@ static unsigned int ib_uverbs_event_poll(struct file *filp,
poll_wait(filp, &file->poll_wait, wait);
spin_lock_irq(&file->lock);
if (file->fd < 0)
pollflags = POLLERR;
else if (!list_empty(&file->event_list))
if (!list_empty(&file->event_list))
pollflags = POLLIN | POLLRDNORM;
spin_unlock_irq(&file->lock);
return pollflags;
}
static void ib_uverbs_event_release(struct ib_uverbs_event_file *file)
void ib_uverbs_release_event_file(struct kref *ref)
{
struct ib_uverbs_event *entry, *tmp;
struct ib_uverbs_event_file *file =
container_of(ref, struct ib_uverbs_event_file, ref);
spin_lock_irq(&file->lock);
if (file->fd != -1) {
file->fd = -1;
list_for_each_entry_safe(entry, tmp, &file->event_list, list)
kfree(entry);
}
spin_unlock_irq(&file->lock);
kfree(file);
}
static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
@ -280,21 +265,30 @@ static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
{
struct ib_uverbs_event_file *file = filp->private_data;
struct ib_uverbs_event *entry, *tmp;
spin_lock_irq(&file->lock);
file->file = NULL;
list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
if (entry->counter)
list_del(&entry->obj_list);
kfree(entry);
}
spin_unlock_irq(&file->lock);
ib_uverbs_event_release(file);
ib_uverbs_event_fasync(-1, filp, 0);
kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
if (file->is_async) {
ib_unregister_event_handler(&file->uverbs_file->event_handler);
kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
}
kref_put(&file->ref, ib_uverbs_release_event_file);
return 0;
}
static struct file_operations uverbs_event_fops = {
/*
* No .owner field since we artificially create event files,
* so there is no increment to the module reference count in
* the open path. All event files come from a uverbs command
* file, which already takes a module reference, so this is OK.
*/
.owner = THIS_MODULE,
.read = ib_uverbs_event_read,
.poll = ib_uverbs_event_poll,
.release = ib_uverbs_event_close,
@ -303,10 +297,19 @@ static struct file_operations uverbs_event_fops = {
void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
{
struct ib_uverbs_file *file = cq_context;
struct ib_ucq_object *uobj;
struct ib_uverbs_event *entry;
unsigned long flags;
struct ib_uverbs_event_file *file = cq_context;
struct ib_ucq_object *uobj;
struct ib_uverbs_event *entry;
unsigned long flags;
if (!file)
return;
spin_lock_irqsave(&file->lock, flags);
if (!file->file) {
spin_unlock_irqrestore(&file->lock, flags);
return;
}
entry = kmalloc(sizeof *entry, GFP_ATOMIC);
if (!entry)
@ -317,13 +320,12 @@ void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
entry->desc.comp.cq_handle = cq->uobject->user_handle;
entry->counter = &uobj->comp_events_reported;
spin_lock_irqsave(&file->comp_file[0].lock, flags);
list_add_tail(&entry->list, &file->comp_file[0].event_list);
list_add_tail(&entry->list, &file->event_list);
list_add_tail(&entry->obj_list, &uobj->comp_list);
spin_unlock_irqrestore(&file->comp_file[0].lock, flags);
spin_unlock_irqrestore(&file->lock, flags);
wake_up_interruptible(&file->comp_file[0].poll_wait);
kill_fasync(&file->comp_file[0].async_queue, SIGIO, POLL_IN);
wake_up_interruptible(&file->poll_wait);
kill_fasync(&file->async_queue, SIGIO, POLL_IN);
}
static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
@ -334,6 +336,12 @@ static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
struct ib_uverbs_event *entry;
unsigned long flags;
spin_lock_irqsave(&file->async_file->lock, flags);
if (!file->async_file->file) {
spin_unlock_irqrestore(&file->async_file->lock, flags);
return;
}
entry = kmalloc(sizeof *entry, GFP_ATOMIC);
if (!entry)
return;
@ -342,24 +350,24 @@ static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
entry->desc.async.event_type = event;
entry->counter = counter;
spin_lock_irqsave(&file->async_file.lock, flags);
list_add_tail(&entry->list, &file->async_file.event_list);
list_add_tail(&entry->list, &file->async_file->event_list);
if (obj_list)
list_add_tail(&entry->obj_list, obj_list);
spin_unlock_irqrestore(&file->async_file.lock, flags);
spin_unlock_irqrestore(&file->async_file->lock, flags);
wake_up_interruptible(&file->async_file.poll_wait);
kill_fasync(&file->async_file.async_queue, SIGIO, POLL_IN);
wake_up_interruptible(&file->async_file->poll_wait);
kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
}
void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
{
struct ib_uverbs_event_file *ev_file = context_ptr;
struct ib_ucq_object *uobj;
uobj = container_of(event->element.cq->uobject,
struct ib_ucq_object, uobject);
ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
ib_uverbs_async_handler(ev_file->uverbs_file, uobj->uobject.user_handle,
event->event, &uobj->async_list,
&uobj->async_events_reported);
@ -389,8 +397,8 @@ void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
&uobj->events_reported);
}
static void ib_uverbs_event_handler(struct ib_event_handler *handler,
struct ib_event *event)
void ib_uverbs_event_handler(struct ib_event_handler *handler,
struct ib_event *event)
{
struct ib_uverbs_file *file =
container_of(handler, struct ib_uverbs_file, event_handler);
@ -399,38 +407,90 @@ static void ib_uverbs_event_handler(struct ib_event_handler *handler,
NULL, NULL);
}
static int ib_uverbs_event_init(struct ib_uverbs_event_file *file,
struct ib_uverbs_file *uverbs_file)
struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
int is_async, int *fd)
{
struct ib_uverbs_event_file *ev_file;
struct file *filp;
int ret;
spin_lock_init(&file->lock);
INIT_LIST_HEAD(&file->event_list);
init_waitqueue_head(&file->poll_wait);
file->uverbs_file = uverbs_file;
file->async_queue = NULL;
ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL);
if (!ev_file)
return ERR_PTR(-ENOMEM);
file->fd = get_unused_fd();
if (file->fd < 0)
return file->fd;
kref_init(&ev_file->ref);
spin_lock_init(&ev_file->lock);
INIT_LIST_HEAD(&ev_file->event_list);
init_waitqueue_head(&ev_file->poll_wait);
ev_file->uverbs_file = uverbs_file;
ev_file->async_queue = NULL;
ev_file->is_async = is_async;
*fd = get_unused_fd();
if (*fd < 0) {
ret = *fd;
goto err;
}
filp = get_empty_filp();
if (!filp) {
put_unused_fd(file->fd);
return -ENFILE;
ret = -ENFILE;
goto err_fd;
}
filp->f_op = &uverbs_event_fops;
ev_file->file = filp;
/*
* fops_get() can't fail here, because we're coming from a
* system call on a uverbs file, which will already have a
* module reference.
*/
filp->f_op = fops_get(&uverbs_event_fops);
filp->f_vfsmnt = mntget(uverbs_event_mnt);
filp->f_dentry = dget(uverbs_event_mnt->mnt_root);
filp->f_mapping = filp->f_dentry->d_inode->i_mapping;
filp->f_flags = O_RDONLY;
filp->f_mode = FMODE_READ;
filp->private_data = file;
filp->private_data = ev_file;
fd_install(file->fd, filp);
return filp;
return 0;
err_fd:
put_unused_fd(*fd);
err:
kfree(ev_file);
return ERR_PTR(ret);
}
/*
* Look up a completion event file by FD. If lookup is successful,
* takes a ref to the event file struct that it returns; if
* unsuccessful, returns NULL.
*/
struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
{
struct ib_uverbs_event_file *ev_file = NULL;
struct file *filp;
filp = fget(fd);
if (!filp)
return NULL;
if (filp->f_op != &uverbs_event_fops)
goto out;
ev_file = filp->private_data;
if (ev_file->is_async) {
ev_file = NULL;
goto out;
}
kref_get(&ev_file->ref);
out:
fput(filp);
return ev_file;
}
static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
@ -453,8 +513,7 @@ static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
!uverbs_cmd_table[hdr.command])
return -EINVAL;
if (!file->ucontext &&
hdr.command != IB_USER_VERBS_CMD_QUERY_PARAMS &&
if (!file->ucontext &&
hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
return -EINVAL;
@ -477,82 +536,33 @@ static int ib_uverbs_open(struct inode *inode, struct file *filp)
struct ib_uverbs_device *dev =
container_of(inode->i_cdev, struct ib_uverbs_device, dev);
struct ib_uverbs_file *file;
int i = 0;
int ret;
if (!try_module_get(dev->ib_dev->owner))
return -ENODEV;
file = kmalloc(sizeof *file +
(dev->num_comp - 1) * sizeof (struct ib_uverbs_event_file),
GFP_KERNEL);
file = kmalloc(sizeof *file, GFP_KERNEL);
if (!file) {
ret = -ENOMEM;
goto err;
module_put(dev->ib_dev->owner);
return -ENOMEM;
}
file->device = dev;
file->device = dev;
file->ucontext = NULL;
kref_init(&file->ref);
init_MUTEX(&file->mutex);
file->ucontext = NULL;
kref_get(&file->ref);
ret = ib_uverbs_event_init(&file->async_file, file);
if (ret)
goto err_kref;
file->async_file.is_async = 1;
for (i = 0; i < dev->num_comp; ++i) {
kref_get(&file->ref);
ret = ib_uverbs_event_init(&file->comp_file[i], file);
if (ret)
goto err_async;
file->comp_file[i].is_async = 0;
}
filp->private_data = file;
INIT_IB_EVENT_HANDLER(&file->event_handler, dev->ib_dev,
ib_uverbs_event_handler);
if (ib_register_event_handler(&file->event_handler))
goto err_async;
return 0;
err_async:
while (i--)
ib_uverbs_event_release(&file->comp_file[i]);
ib_uverbs_event_release(&file->async_file);
err_kref:
/*
* One extra kref_put() because we took a reference before the
* event file creation that failed and got us here.
*/
kref_put(&file->ref, ib_uverbs_release_file);
kref_put(&file->ref, ib_uverbs_release_file);
err:
module_put(dev->ib_dev->owner);
return ret;
}
static int ib_uverbs_close(struct inode *inode, struct file *filp)
{
struct ib_uverbs_file *file = filp->private_data;
int i;
ib_unregister_event_handler(&file->event_handler);
ib_uverbs_event_release(&file->async_file);
ib_dealloc_ucontext(file->ucontext);
for (i = 0; i < file->device->num_comp; ++i)
ib_uverbs_event_release(&file->comp_file[i]);
kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
kref_put(&file->ref, ib_uverbs_release_file);
return 0;
@ -631,8 +641,8 @@ static void ib_uverbs_add_one(struct ib_device *device)
set_bit(uverbs_dev->devnum, dev_map);
spin_unlock(&map_lock);
uverbs_dev->ib_dev = device;
uverbs_dev->num_comp = 1;
uverbs_dev->ib_dev = device;
uverbs_dev->num_comp_vectors = 1;
if (device->mmap)
cdev_init(&uverbs_dev->dev, &uverbs_mmap_fops);

58
include/rdma/ib_user_verbs.h
View file

@ -42,15 +42,12 @@
* Increment this value if any changes that break userspace ABI
* compatibility are made.
*/
#define IB_USER_VERBS_ABI_VERSION 2
#define IB_USER_VERBS_ABI_VERSION 3
enum {
IB_USER_VERBS_CMD_QUERY_PARAMS,
IB_USER_VERBS_CMD_GET_CONTEXT,
IB_USER_VERBS_CMD_QUERY_DEVICE,
IB_USER_VERBS_CMD_QUERY_PORT,
IB_USER_VERBS_CMD_QUERY_GID,
IB_USER_VERBS_CMD_QUERY_PKEY,
IB_USER_VERBS_CMD_ALLOC_PD,
IB_USER_VERBS_CMD_DEALLOC_PD,
IB_USER_VERBS_CMD_CREATE_AH,
@ -65,6 +62,7 @@ enum {
IB_USER_VERBS_CMD_ALLOC_MW,
IB_USER_VERBS_CMD_BIND_MW,
IB_USER_VERBS_CMD_DEALLOC_MW,
IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL,
IB_USER_VERBS_CMD_CREATE_CQ,
IB_USER_VERBS_CMD_RESIZE_CQ,
IB_USER_VERBS_CMD_DESTROY_CQ,
@ -118,27 +116,14 @@ struct ib_uverbs_cmd_hdr {
__u16 out_words;
};
/*
* No driver_data for "query params" command, since this is intended
* to be a core function with no possible device dependence.
*/
struct ib_uverbs_query_params {
__u64 response;
};
struct ib_uverbs_query_params_resp {
__u32 num_cq_events;
};
struct ib_uverbs_get_context {
__u64 response;
__u64 cq_fd_tab;
__u64 driver_data[0];
};
struct ib_uverbs_get_context_resp {
__u32 async_fd;
__u32 reserved;
__u32 num_comp_vectors;
};
struct ib_uverbs_query_device {
@ -220,31 +205,6 @@ struct ib_uverbs_query_port_resp {
__u8 reserved[3];
};
struct ib_uverbs_query_gid {
__u64 response;
__u8 port_num;
__u8 index;
__u8 reserved[6];
__u64 driver_data[0];
};
struct ib_uverbs_query_gid_resp {
__u8 gid[16];
};
struct ib_uverbs_query_pkey {
__u64 response;
__u8 port_num;
__u8 index;
__u8 reserved[6];
__u64 driver_data[0];
};
struct ib_uverbs_query_pkey_resp {
__u16 pkey;
__u16 reserved;
};
struct ib_uverbs_alloc_pd {
__u64 response;
__u64 driver_data[0];
@ -278,11 +238,21 @@ struct ib_uverbs_dereg_mr {
__u32 mr_handle;
};
struct ib_uverbs_create_comp_channel {
__u64 response;
};
struct ib_uverbs_create_comp_channel_resp {
__u32 fd;
};
struct ib_uverbs_create_cq {
__u64 response;
__u64 user_handle;
__u32 cqe;
__u32 event_handler;
__u32 comp_vector;
__s32 comp_channel;
__u32 reserved;
__u64 driver_data[0];
};