alistair23-linux/drivers/infiniband/core/device.c
Linus Torvalds 19fd08b85b Merge candidates for 4.17 merge window
- Fix RDMA uapi headers to actually compile in userspace and be more
   complete
 
 - Three shared with netdev pull requests from Mellanox:
 
    * 7 patches, mostly to net with 1 IB related one at the back). This
      series addresses an IRQ performance issue (patch 1), cleanups related to
      the fix for the IRQ performance problem (patches 2-6), and then extends
      the fragmented completion queue support that already exists in the net
      side of the driver to the ib side of the driver (patch 7).
 
    * Mostly IB, with 5 patches to net that are needed to support the remaining
      10 patches to the IB subsystem. This series extends the current
      'representor' framework when the mlx5 driver is in switchdev mode from
      being a netdev only construct to being a netdev/IB dev construct. The IB
      dev is limited to raw Eth queue pairs only, but by having an IB dev of
      this type attached to the representor for a switchdev port, it enables
      DPDK to work on the switchdev device.
 
    * All net related, but needed as infrastructure for the rdma driver
 
 - Updates for the hns, i40iw, bnxt_re, cxgb3, cxgb4, hns drivers
 
 - SRP performance updates
 
 - IB uverbs write path cleanup patch series from Leon
 
 - Add RDMA_CM support to ib_srpt. This is disabled by default.  Users need to
   set the port for ib_srpt to listen on in configfs in order for it to be
   enabled (/sys/kernel/config/target/srpt/discovery_auth/rdma_cm_port)
 
 - TSO and Scatter FCS support in mlx4
 
 - Refactor of modify_qp routine to resolve problems seen while working on new
   code that is forthcoming
 
 - More refactoring and updates of RDMA CM for containers support from Parav
 
 - mlx5 'fine grained packet pacing', 'ipsec offload' and 'device memory'
   user API features
 
 - Infrastructure updates for the new IOCTL interface, based on increased usage
 
 - ABI compatibility bug fixes to fully support 32 bit userspace on 64 bit
   kernel as was originally intended. See the commit messages for
   extensive details
 
 - Syzkaller bugs and code cleanups motivated by them
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Merge tag 'for-linus-unmerged' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma

Pull rdma updates from Jason Gunthorpe:
 "Doug and I are at a conference next week so if another PR is sent I
  expect it to only be bug fixes. Parav noted yesterday that there are
  some fringe case behavior changes in his work that he would like to
  fix, and I see that Intel has a number of rc looking patches for HFI1
  they posted yesterday.

  Parav is again the biggest contributor by patch count with his ongoing
  work to enable container support in the RDMA stack, followed by Leon
  doing syzkaller inspired cleanups, though most of the actual fixing
  went to RC.

  There is one uncomfortable series here fixing the user ABI to actually
  work as intended in 32 bit mode. There are lots of notes in the commit
  messages, but the basic summary is we don't think there is an actual
  32 bit kernel user of drivers/infiniband for several good reasons.

  However we are seeing people want to use a 32 bit user space with 64
  bit kernel, which didn't completely work today. So in fixing it we
  required a 32 bit rxe user to upgrade their userspace. rxe users are
  still already quite rare and we think a 32 bit one is non-existing.

   - Fix RDMA uapi headers to actually compile in userspace and be more
     complete

   - Three shared with netdev pull requests from Mellanox:

      * 7 patches, mostly to net with 1 IB related one at the back).
        This series addresses an IRQ performance issue (patch 1),
        cleanups related to the fix for the IRQ performance problem
        (patches 2-6), and then extends the fragmented completion queue
        support that already exists in the net side of the driver to the
        ib side of the driver (patch 7).

      * Mostly IB, with 5 patches to net that are needed to support the
        remaining 10 patches to the IB subsystem. This series extends
        the current 'representor' framework when the mlx5 driver is in
        switchdev mode from being a netdev only construct to being a
        netdev/IB dev construct. The IB dev is limited to raw Eth queue
        pairs only, but by having an IB dev of this type attached to the
        representor for a switchdev port, it enables DPDK to work on the
        switchdev device.

      * All net related, but needed as infrastructure for the rdma
        driver

   - Updates for the hns, i40iw, bnxt_re, cxgb3, cxgb4, hns drivers

   - SRP performance updates

   - IB uverbs write path cleanup patch series from Leon

   - Add RDMA_CM support to ib_srpt. This is disabled by default. Users
     need to set the port for ib_srpt to listen on in configfs in order
     for it to be enabled
     (/sys/kernel/config/target/srpt/discovery_auth/rdma_cm_port)

   - TSO and Scatter FCS support in mlx4

   - Refactor of modify_qp routine to resolve problems seen while
     working on new code that is forthcoming

   - More refactoring and updates of RDMA CM for containers support from
     Parav

   - mlx5 'fine grained packet pacing', 'ipsec offload' and 'device
     memory' user API features

   - Infrastructure updates for the new IOCTL interface, based on
     increased usage

   - ABI compatibility bug fixes to fully support 32 bit userspace on 64
     bit kernel as was originally intended. See the commit messages for
     extensive details

   - Syzkaller bugs and code cleanups motivated by them"

* tag 'for-linus-unmerged' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma: (199 commits)
  IB/rxe: Fix for oops in rxe_register_device on ppc64le arch
  IB/mlx5: Device memory mr registration support
  net/mlx5: Mkey creation command adjustments
  IB/mlx5: Device memory support in mlx5_ib
  net/mlx5: Query device memory capabilities
  IB/uverbs: Add device memory registration ioctl support
  IB/uverbs: Add alloc/free dm uverbs ioctl support
  IB/uverbs: Add device memory capabilities reporting
  IB/uverbs: Expose device memory capabilities to user
  RDMA/qedr: Fix wmb usage in qedr
  IB/rxe: Removed GID add/del dummy routines
  RDMA/qedr: Zero stack memory before copying to user space
  IB/mlx5: Add ability to hash by IPSEC_SPI when creating a TIR
  IB/mlx5: Add information for querying IPsec capabilities
  IB/mlx5: Add IPsec support for egress and ingress
  {net,IB}/mlx5: Add ipsec helper
  IB/mlx5: Add modify_flow_action_esp verb
  IB/mlx5: Add implementation for create and destroy action_xfrm
  IB/uverbs: Introduce ESP steering match filter
  IB/uverbs: Add modify ESP flow_action
  ...
2018-04-06 17:35:43 -07:00

1269 lines
32 KiB
C

/*
* Copyright (c) 2004 Topspin Communications. All rights reserved.
* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/module.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/mutex.h>
#include <linux/netdevice.h>
#include <linux/security.h>
#include <linux/notifier.h>
#include <rdma/rdma_netlink.h>
#include <rdma/ib_addr.h>
#include <rdma/ib_cache.h>
#include "core_priv.h"
MODULE_AUTHOR("Roland Dreier");
MODULE_DESCRIPTION("core kernel InfiniBand API");
MODULE_LICENSE("Dual BSD/GPL");
struct ib_client_data {
struct list_head list;
struct ib_client *client;
void * data;
/* The device or client is going down. Do not call client or device
* callbacks other than remove(). */
bool going_down;
};
struct workqueue_struct *ib_comp_wq;
struct workqueue_struct *ib_wq;
EXPORT_SYMBOL_GPL(ib_wq);
/* The device_list and client_list contain devices and clients after their
* registration has completed, and the devices and clients are removed
* during unregistration. */
static LIST_HEAD(device_list);
static LIST_HEAD(client_list);
/*
* device_mutex and lists_rwsem protect access to both device_list and
* client_list. device_mutex protects writer access by device and client
* registration / de-registration. lists_rwsem protects reader access to
* these lists. Iterators of these lists must lock it for read, while updates
* to the lists must be done with a write lock. A special case is when the
* device_mutex is locked. In this case locking the lists for read access is
* not necessary as the device_mutex implies it.
*
* lists_rwsem also protects access to the client data list.
*/
static DEFINE_MUTEX(device_mutex);
static DECLARE_RWSEM(lists_rwsem);
static int ib_security_change(struct notifier_block *nb, unsigned long event,
void *lsm_data);
static void ib_policy_change_task(struct work_struct *work);
static DECLARE_WORK(ib_policy_change_work, ib_policy_change_task);
static struct notifier_block ibdev_lsm_nb = {
.notifier_call = ib_security_change,
};
static int ib_device_check_mandatory(struct ib_device *device)
{
#define IB_MANDATORY_FUNC(x) { offsetof(struct ib_device, x), #x }
static const struct {
size_t offset;
char *name;
} mandatory_table[] = {
IB_MANDATORY_FUNC(query_device),
IB_MANDATORY_FUNC(query_port),
IB_MANDATORY_FUNC(query_pkey),
IB_MANDATORY_FUNC(alloc_pd),
IB_MANDATORY_FUNC(dealloc_pd),
IB_MANDATORY_FUNC(create_ah),
IB_MANDATORY_FUNC(destroy_ah),
IB_MANDATORY_FUNC(create_qp),
IB_MANDATORY_FUNC(modify_qp),
IB_MANDATORY_FUNC(destroy_qp),
IB_MANDATORY_FUNC(post_send),
IB_MANDATORY_FUNC(post_recv),
IB_MANDATORY_FUNC(create_cq),
IB_MANDATORY_FUNC(destroy_cq),
IB_MANDATORY_FUNC(poll_cq),
IB_MANDATORY_FUNC(req_notify_cq),
IB_MANDATORY_FUNC(get_dma_mr),
IB_MANDATORY_FUNC(dereg_mr),
IB_MANDATORY_FUNC(get_port_immutable)
};
int i;
for (i = 0; i < ARRAY_SIZE(mandatory_table); ++i) {
if (!*(void **) ((void *) device + mandatory_table[i].offset)) {
pr_warn("Device %s is missing mandatory function %s\n",
device->name, mandatory_table[i].name);
return -EINVAL;
}
}
return 0;
}
static struct ib_device *__ib_device_get_by_index(u32 index)
{
struct ib_device *device;
list_for_each_entry(device, &device_list, core_list)
if (device->index == index)
return device;
return NULL;
}
/*
* Caller is responsible to return refrerence count by calling put_device()
*/
struct ib_device *ib_device_get_by_index(u32 index)
{
struct ib_device *device;
down_read(&lists_rwsem);
device = __ib_device_get_by_index(index);
if (device)
get_device(&device->dev);
up_read(&lists_rwsem);
return device;
}
static struct ib_device *__ib_device_get_by_name(const char *name)
{
struct ib_device *device;
list_for_each_entry(device, &device_list, core_list)
if (!strncmp(name, device->name, IB_DEVICE_NAME_MAX))
return device;
return NULL;
}
static int alloc_name(char *name)
{
unsigned long *inuse;
char buf[IB_DEVICE_NAME_MAX];
struct ib_device *device;
int i;
inuse = (unsigned long *) get_zeroed_page(GFP_KERNEL);
if (!inuse)
return -ENOMEM;
list_for_each_entry(device, &device_list, core_list) {
if (!sscanf(device->name, name, &i))
continue;
if (i < 0 || i >= PAGE_SIZE * 8)
continue;
snprintf(buf, sizeof buf, name, i);
if (!strncmp(buf, device->name, IB_DEVICE_NAME_MAX))
set_bit(i, inuse);
}
i = find_first_zero_bit(inuse, PAGE_SIZE * 8);
free_page((unsigned long) inuse);
snprintf(buf, sizeof buf, name, i);
if (__ib_device_get_by_name(buf))
return -ENFILE;
strlcpy(name, buf, IB_DEVICE_NAME_MAX);
return 0;
}
static void ib_device_release(struct device *device)
{
struct ib_device *dev = container_of(device, struct ib_device, dev);
WARN_ON(dev->reg_state == IB_DEV_REGISTERED);
if (dev->reg_state == IB_DEV_UNREGISTERED) {
/*
* In IB_DEV_UNINITIALIZED state, cache or port table
* is not even created. Free cache and port table only when
* device reaches UNREGISTERED state.
*/
ib_cache_release_one(dev);
kfree(dev->port_immutable);
}
kfree(dev);
}
static int ib_device_uevent(struct device *device,
struct kobj_uevent_env *env)
{
struct ib_device *dev = container_of(device, struct ib_device, dev);
if (add_uevent_var(env, "NAME=%s", dev->name))
return -ENOMEM;
/*
* It would be nice to pass the node GUID with the event...
*/
return 0;
}
static struct class ib_class = {
.name = "infiniband",
.dev_release = ib_device_release,
.dev_uevent = ib_device_uevent,
};
/**
* ib_alloc_device - allocate an IB device struct
* @size:size of structure to allocate
*
* Low-level drivers should use ib_alloc_device() to allocate &struct
* ib_device. @size is the size of the structure to be allocated,
* including any private data used by the low-level driver.
* ib_dealloc_device() must be used to free structures allocated with
* ib_alloc_device().
*/
struct ib_device *ib_alloc_device(size_t size)
{
struct ib_device *device;
if (WARN_ON(size < sizeof(struct ib_device)))
return NULL;
device = kzalloc(size, GFP_KERNEL);
if (!device)
return NULL;
rdma_restrack_init(&device->res);
device->dev.class = &ib_class;
device_initialize(&device->dev);
dev_set_drvdata(&device->dev, device);
INIT_LIST_HEAD(&device->event_handler_list);
spin_lock_init(&device->event_handler_lock);
spin_lock_init(&device->client_data_lock);
INIT_LIST_HEAD(&device->client_data_list);
INIT_LIST_HEAD(&device->port_list);
return device;
}
EXPORT_SYMBOL(ib_alloc_device);
/**
* ib_dealloc_device - free an IB device struct
* @device:structure to free
*
* Free a structure allocated with ib_alloc_device().
*/
void ib_dealloc_device(struct ib_device *device)
{
WARN_ON(device->reg_state != IB_DEV_UNREGISTERED &&
device->reg_state != IB_DEV_UNINITIALIZED);
rdma_restrack_clean(&device->res);
put_device(&device->dev);
}
EXPORT_SYMBOL(ib_dealloc_device);
static int add_client_context(struct ib_device *device, struct ib_client *client)
{
struct ib_client_data *context;
unsigned long flags;
context = kmalloc(sizeof *context, GFP_KERNEL);
if (!context)
return -ENOMEM;
context->client = client;
context->data = NULL;
context->going_down = false;
down_write(&lists_rwsem);
spin_lock_irqsave(&device->client_data_lock, flags);
list_add(&context->list, &device->client_data_list);
spin_unlock_irqrestore(&device->client_data_lock, flags);
up_write(&lists_rwsem);
return 0;
}
static int verify_immutable(const struct ib_device *dev, u8 port)
{
return WARN_ON(!rdma_cap_ib_mad(dev, port) &&
rdma_max_mad_size(dev, port) != 0);
}
static int read_port_immutable(struct ib_device *device)
{
int ret;
u8 start_port = rdma_start_port(device);
u8 end_port = rdma_end_port(device);
u8 port;
/**
* device->port_immutable is indexed directly by the port number to make
* access to this data as efficient as possible.
*
* Therefore port_immutable is declared as a 1 based array with
* potential empty slots at the beginning.
*/
device->port_immutable = kzalloc(sizeof(*device->port_immutable)
* (end_port + 1),
GFP_KERNEL);
if (!device->port_immutable)
return -ENOMEM;
for (port = start_port; port <= end_port; ++port) {
ret = device->get_port_immutable(device, port,
&device->port_immutable[port]);
if (ret)
return ret;
if (verify_immutable(device, port))
return -EINVAL;
}
return 0;
}
void ib_get_device_fw_str(struct ib_device *dev, char *str)
{
if (dev->get_dev_fw_str)
dev->get_dev_fw_str(dev, str);
else
str[0] = '\0';
}
EXPORT_SYMBOL(ib_get_device_fw_str);
static int setup_port_pkey_list(struct ib_device *device)
{
int i;
/**
* device->port_pkey_list is indexed directly by the port number,
* Therefore it is declared as a 1 based array with potential empty
* slots at the beginning.
*/
device->port_pkey_list = kcalloc(rdma_end_port(device) + 1,
sizeof(*device->port_pkey_list),
GFP_KERNEL);
if (!device->port_pkey_list)
return -ENOMEM;
for (i = 0; i < (rdma_end_port(device) + 1); i++) {
spin_lock_init(&device->port_pkey_list[i].list_lock);
INIT_LIST_HEAD(&device->port_pkey_list[i].pkey_list);
}
return 0;
}
static void ib_policy_change_task(struct work_struct *work)
{
struct ib_device *dev;
down_read(&lists_rwsem);
list_for_each_entry(dev, &device_list, core_list) {
int i;
for (i = rdma_start_port(dev); i <= rdma_end_port(dev); i++) {
u64 sp;
int ret = ib_get_cached_subnet_prefix(dev,
i,
&sp);
WARN_ONCE(ret,
"ib_get_cached_subnet_prefix err: %d, this should never happen here\n",
ret);
if (!ret)
ib_security_cache_change(dev, i, sp);
}
}
up_read(&lists_rwsem);
}
static int ib_security_change(struct notifier_block *nb, unsigned long event,
void *lsm_data)
{
if (event != LSM_POLICY_CHANGE)
return NOTIFY_DONE;
schedule_work(&ib_policy_change_work);
return NOTIFY_OK;
}
/**
* __dev_new_index - allocate an device index
*
* Returns a suitable unique value for a new device interface
* number. It assumes that there are less than 2^32-1 ib devices
* will be present in the system.
*/
static u32 __dev_new_index(void)
{
/*
* The device index to allow stable naming.
* Similar to struct net -> ifindex.
*/
static u32 index;
for (;;) {
if (!(++index))
index = 1;
if (!__ib_device_get_by_index(index))
return index;
}
}
/**
* ib_register_device - Register an IB device with IB core
* @device:Device to register
*
* Low-level drivers use ib_register_device() to register their
* devices with the IB core. All registered clients will receive a
* callback for each device that is added. @device must be allocated
* with ib_alloc_device().
*/
int ib_register_device(struct ib_device *device,
int (*port_callback)(struct ib_device *,
u8, struct kobject *))
{
int ret;
struct ib_client *client;
struct ib_udata uhw = {.outlen = 0, .inlen = 0};
struct device *parent = device->dev.parent;
WARN_ON_ONCE(device->dma_device);
if (device->dev.dma_ops) {
/*
* The caller provided custom DMA operations. Copy the
* DMA-related fields that are used by e.g. dma_alloc_coherent()
* into device->dev.
*/
device->dma_device = &device->dev;
if (!device->dev.dma_mask) {
if (parent)
device->dev.dma_mask = parent->dma_mask;
else
WARN_ON_ONCE(true);
}
if (!device->dev.coherent_dma_mask) {
if (parent)
device->dev.coherent_dma_mask =
parent->coherent_dma_mask;
else
WARN_ON_ONCE(true);
}
} else {
/*
* The caller did not provide custom DMA operations. Use the
* DMA mapping operations of the parent device.
*/
WARN_ON_ONCE(!parent);
device->dma_device = parent;
}
mutex_lock(&device_mutex);
if (strchr(device->name, '%')) {
ret = alloc_name(device->name);
if (ret)
goto out;
}
if (ib_device_check_mandatory(device)) {
ret = -EINVAL;
goto out;
}
ret = read_port_immutable(device);
if (ret) {
pr_warn("Couldn't create per port immutable data %s\n",
device->name);
goto out;
}
ret = setup_port_pkey_list(device);
if (ret) {
pr_warn("Couldn't create per port_pkey_list\n");
goto out;
}
ret = ib_cache_setup_one(device);
if (ret) {
pr_warn("Couldn't set up InfiniBand P_Key/GID cache\n");
goto port_cleanup;
}
ret = ib_device_register_rdmacg(device);
if (ret) {
pr_warn("Couldn't register device with rdma cgroup\n");
goto cache_cleanup;
}
memset(&device->attrs, 0, sizeof(device->attrs));
ret = device->query_device(device, &device->attrs, &uhw);
if (ret) {
pr_warn("Couldn't query the device attributes\n");
goto cg_cleanup;
}
ret = ib_device_register_sysfs(device, port_callback);
if (ret) {
pr_warn("Couldn't register device %s with driver model\n",
device->name);
goto cg_cleanup;
}
device->reg_state = IB_DEV_REGISTERED;
list_for_each_entry(client, &client_list, list)
if (!add_client_context(device, client) && client->add)
client->add(device);
device->index = __dev_new_index();
down_write(&lists_rwsem);
list_add_tail(&device->core_list, &device_list);
up_write(&lists_rwsem);
mutex_unlock(&device_mutex);
return 0;
cg_cleanup:
ib_device_unregister_rdmacg(device);
cache_cleanup:
ib_cache_cleanup_one(device);
ib_cache_release_one(device);
port_cleanup:
kfree(device->port_immutable);
out:
mutex_unlock(&device_mutex);
return ret;
}
EXPORT_SYMBOL(ib_register_device);
/**
* ib_unregister_device - Unregister an IB device
* @device:Device to unregister
*
* Unregister an IB device. All clients will receive a remove callback.
*/
void ib_unregister_device(struct ib_device *device)
{
struct ib_client_data *context, *tmp;
unsigned long flags;
mutex_lock(&device_mutex);
down_write(&lists_rwsem);
list_del(&device->core_list);
spin_lock_irqsave(&device->client_data_lock, flags);
list_for_each_entry_safe(context, tmp, &device->client_data_list, list)
context->going_down = true;
spin_unlock_irqrestore(&device->client_data_lock, flags);
downgrade_write(&lists_rwsem);
list_for_each_entry_safe(context, tmp, &device->client_data_list,
list) {
if (context->client->remove)
context->client->remove(device, context->data);
}
up_read(&lists_rwsem);
ib_device_unregister_rdmacg(device);
ib_device_unregister_sysfs(device);
mutex_unlock(&device_mutex);
ib_cache_cleanup_one(device);
ib_security_destroy_port_pkey_list(device);
kfree(device->port_pkey_list);
down_write(&lists_rwsem);
spin_lock_irqsave(&device->client_data_lock, flags);
list_for_each_entry_safe(context, tmp, &device->client_data_list, list)
kfree(context);
spin_unlock_irqrestore(&device->client_data_lock, flags);
up_write(&lists_rwsem);
device->reg_state = IB_DEV_UNREGISTERED;
}
EXPORT_SYMBOL(ib_unregister_device);
/**
* ib_register_client - Register an IB client
* @client:Client to register
*
* Upper level users of the IB drivers can use ib_register_client() to
* register callbacks for IB device addition and removal. When an IB
* device is added, each registered client's add method will be called
* (in the order the clients were registered), and when a device is
* removed, each client's remove method will be called (in the reverse
* order that clients were registered). In addition, when
* ib_register_client() is called, the client will receive an add
* callback for all devices already registered.
*/
int ib_register_client(struct ib_client *client)
{
struct ib_device *device;
mutex_lock(&device_mutex);
list_for_each_entry(device, &device_list, core_list)
if (!add_client_context(device, client) && client->add)
client->add(device);
down_write(&lists_rwsem);
list_add_tail(&client->list, &client_list);
up_write(&lists_rwsem);
mutex_unlock(&device_mutex);
return 0;
}
EXPORT_SYMBOL(ib_register_client);
/**
* ib_unregister_client - Unregister an IB client
* @client:Client to unregister
*
* Upper level users use ib_unregister_client() to remove their client
* registration. When ib_unregister_client() is called, the client
* will receive a remove callback for each IB device still registered.
*/
void ib_unregister_client(struct ib_client *client)
{
struct ib_client_data *context, *tmp;
struct ib_device *device;
unsigned long flags;
mutex_lock(&device_mutex);
down_write(&lists_rwsem);
list_del(&client->list);
up_write(&lists_rwsem);
list_for_each_entry(device, &device_list, core_list) {
struct ib_client_data *found_context = NULL;
down_write(&lists_rwsem);
spin_lock_irqsave(&device->client_data_lock, flags);
list_for_each_entry_safe(context, tmp, &device->client_data_list, list)
if (context->client == client) {
context->going_down = true;
found_context = context;
break;
}
spin_unlock_irqrestore(&device->client_data_lock, flags);
up_write(&lists_rwsem);
if (client->remove)
client->remove(device, found_context ?
found_context->data : NULL);
if (!found_context) {
pr_warn("No client context found for %s/%s\n",
device->name, client->name);
continue;
}
down_write(&lists_rwsem);
spin_lock_irqsave(&device->client_data_lock, flags);
list_del(&found_context->list);
kfree(found_context);
spin_unlock_irqrestore(&device->client_data_lock, flags);
up_write(&lists_rwsem);
}
mutex_unlock(&device_mutex);
}
EXPORT_SYMBOL(ib_unregister_client);
/**
* ib_get_client_data - Get IB client context
* @device:Device to get context for
* @client:Client to get context for
*
* ib_get_client_data() returns client context set with
* ib_set_client_data().
*/
void *ib_get_client_data(struct ib_device *device, struct ib_client *client)
{
struct ib_client_data *context;
void *ret = NULL;
unsigned long flags;
spin_lock_irqsave(&device->client_data_lock, flags);
list_for_each_entry(context, &device->client_data_list, list)
if (context->client == client) {
ret = context->data;
break;
}
spin_unlock_irqrestore(&device->client_data_lock, flags);
return ret;
}
EXPORT_SYMBOL(ib_get_client_data);
/**
* ib_set_client_data - Set IB client context
* @device:Device to set context for
* @client:Client to set context for
* @data:Context to set
*
* ib_set_client_data() sets client context that can be retrieved with
* ib_get_client_data().
*/
void ib_set_client_data(struct ib_device *device, struct ib_client *client,
void *data)
{
struct ib_client_data *context;
unsigned long flags;
spin_lock_irqsave(&device->client_data_lock, flags);
list_for_each_entry(context, &device->client_data_list, list)
if (context->client == client) {
context->data = data;
goto out;
}
pr_warn("No client context found for %s/%s\n",
device->name, client->name);
out:
spin_unlock_irqrestore(&device->client_data_lock, flags);
}
EXPORT_SYMBOL(ib_set_client_data);
/**
* ib_register_event_handler - Register an IB event handler
* @event_handler:Handler to register
*
* ib_register_event_handler() registers an event handler that will be
* called back when asynchronous IB events occur (as defined in
* chapter 11 of the InfiniBand Architecture Specification). This
* callback may occur in interrupt context.
*/
void ib_register_event_handler(struct ib_event_handler *event_handler)
{
unsigned long flags;
spin_lock_irqsave(&event_handler->device->event_handler_lock, flags);
list_add_tail(&event_handler->list,
&event_handler->device->event_handler_list);
spin_unlock_irqrestore(&event_handler->device->event_handler_lock, flags);
}
EXPORT_SYMBOL(ib_register_event_handler);
/**
* ib_unregister_event_handler - Unregister an event handler
* @event_handler:Handler to unregister
*
* Unregister an event handler registered with
* ib_register_event_handler().
*/
void ib_unregister_event_handler(struct ib_event_handler *event_handler)
{
unsigned long flags;
spin_lock_irqsave(&event_handler->device->event_handler_lock, flags);
list_del(&event_handler->list);
spin_unlock_irqrestore(&event_handler->device->event_handler_lock, flags);
}
EXPORT_SYMBOL(ib_unregister_event_handler);
/**
* ib_dispatch_event - Dispatch an asynchronous event
* @event:Event to dispatch
*
* Low-level drivers must call ib_dispatch_event() to dispatch the
* event to all registered event handlers when an asynchronous event
* occurs.
*/
void ib_dispatch_event(struct ib_event *event)
{
unsigned long flags;
struct ib_event_handler *handler;
spin_lock_irqsave(&event->device->event_handler_lock, flags);
list_for_each_entry(handler, &event->device->event_handler_list, list)
handler->handler(handler, event);
spin_unlock_irqrestore(&event->device->event_handler_lock, flags);
}
EXPORT_SYMBOL(ib_dispatch_event);
/**
* ib_query_port - Query IB port attributes
* @device:Device to query
* @port_num:Port number to query
* @port_attr:Port attributes
*
* ib_query_port() returns the attributes of a port through the
* @port_attr pointer.
*/
int ib_query_port(struct ib_device *device,
u8 port_num,
struct ib_port_attr *port_attr)
{
union ib_gid gid;
int err;
if (!rdma_is_port_valid(device, port_num))
return -EINVAL;
memset(port_attr, 0, sizeof(*port_attr));
err = device->query_port(device, port_num, port_attr);
if (err || port_attr->subnet_prefix)
return err;
if (rdma_port_get_link_layer(device, port_num) != IB_LINK_LAYER_INFINIBAND)
return 0;
err = device->query_gid(device, port_num, 0, &gid);
if (err)
return err;
port_attr->subnet_prefix = be64_to_cpu(gid.global.subnet_prefix);
return 0;
}
EXPORT_SYMBOL(ib_query_port);
/**
* ib_query_gid - Get GID table entry
* @device:Device to query
* @port_num:Port number to query
* @index:GID table index to query
* @gid:Returned GID
* @attr: Returned GID attributes related to this GID index (only in RoCE).
* NULL means ignore.
*
* ib_query_gid() fetches the specified GID table entry from the cache.
*/
int ib_query_gid(struct ib_device *device,
u8 port_num, int index, union ib_gid *gid,
struct ib_gid_attr *attr)
{
return ib_get_cached_gid(device, port_num, index, gid, attr);
}
EXPORT_SYMBOL(ib_query_gid);
/**
* ib_enum_roce_netdev - enumerate all RoCE ports
* @ib_dev : IB device we want to query
* @filter: Should we call the callback?
* @filter_cookie: Cookie passed to filter
* @cb: Callback to call for each found RoCE ports
* @cookie: Cookie passed back to the callback
*
* Enumerates all of the physical RoCE ports of ib_dev
* which are related to netdevice and calls callback() on each
* device for which filter() function returns non zero.
*/
void ib_enum_roce_netdev(struct ib_device *ib_dev,
roce_netdev_filter filter,
void *filter_cookie,
roce_netdev_callback cb,
void *cookie)
{
u8 port;
for (port = rdma_start_port(ib_dev); port <= rdma_end_port(ib_dev);
port++)
if (rdma_protocol_roce(ib_dev, port)) {
struct net_device *idev = NULL;
if (ib_dev->get_netdev)
idev = ib_dev->get_netdev(ib_dev, port);
if (idev &&
idev->reg_state >= NETREG_UNREGISTERED) {
dev_put(idev);
idev = NULL;
}
if (filter(ib_dev, port, idev, filter_cookie))
cb(ib_dev, port, idev, cookie);
if (idev)
dev_put(idev);
}
}
/**
* ib_enum_all_roce_netdevs - enumerate all RoCE devices
* @filter: Should we call the callback?
* @filter_cookie: Cookie passed to filter
* @cb: Callback to call for each found RoCE ports
* @cookie: Cookie passed back to the callback
*
* Enumerates all RoCE devices' physical ports which are related
* to netdevices and calls callback() on each device for which
* filter() function returns non zero.
*/
void ib_enum_all_roce_netdevs(roce_netdev_filter filter,
void *filter_cookie,
roce_netdev_callback cb,
void *cookie)
{
struct ib_device *dev;
down_read(&lists_rwsem);
list_for_each_entry(dev, &device_list, core_list)
ib_enum_roce_netdev(dev, filter, filter_cookie, cb, cookie);
up_read(&lists_rwsem);
}
/**
* ib_enum_all_devs - enumerate all ib_devices
* @cb: Callback to call for each found ib_device
*
* Enumerates all ib_devices and calls callback() on each device.
*/
int ib_enum_all_devs(nldev_callback nldev_cb, struct sk_buff *skb,
struct netlink_callback *cb)
{
struct ib_device *dev;
unsigned int idx = 0;
int ret = 0;
down_read(&lists_rwsem);
list_for_each_entry(dev, &device_list, core_list) {
ret = nldev_cb(dev, skb, cb, idx);
if (ret)
break;
idx++;
}
up_read(&lists_rwsem);
return ret;
}
/**
* ib_query_pkey - Get P_Key table entry
* @device:Device to query
* @port_num:Port number to query
* @index:P_Key table index to query
* @pkey:Returned P_Key
*
* ib_query_pkey() fetches the specified P_Key table entry.
*/
int ib_query_pkey(struct ib_device *device,
u8 port_num, u16 index, u16 *pkey)
{
return device->query_pkey(device, port_num, index, pkey);
}
EXPORT_SYMBOL(ib_query_pkey);
/**
* ib_modify_device - Change IB device attributes
* @device:Device to modify
* @device_modify_mask:Mask of attributes to change
* @device_modify:New attribute values
*
* ib_modify_device() changes a device's attributes as specified by
* the @device_modify_mask and @device_modify structure.
*/
int ib_modify_device(struct ib_device *device,
int device_modify_mask,
struct ib_device_modify *device_modify)
{
if (!device->modify_device)
return -ENOSYS;
return device->modify_device(device, device_modify_mask,
device_modify);
}
EXPORT_SYMBOL(ib_modify_device);
/**
* ib_modify_port - Modifies the attributes for the specified port.
* @device: The device to modify.
* @port_num: The number of the port to modify.
* @port_modify_mask: Mask used to specify which attributes of the port
* to change.
* @port_modify: New attribute values for the port.
*
* ib_modify_port() changes a port's attributes as specified by the
* @port_modify_mask and @port_modify structure.
*/
int ib_modify_port(struct ib_device *device,
u8 port_num, int port_modify_mask,
struct ib_port_modify *port_modify)
{
int rc;
if (!rdma_is_port_valid(device, port_num))
return -EINVAL;
if (device->modify_port)
rc = device->modify_port(device, port_num, port_modify_mask,
port_modify);
else
rc = rdma_protocol_roce(device, port_num) ? 0 : -ENOSYS;
return rc;
}
EXPORT_SYMBOL(ib_modify_port);
/**
* ib_find_gid - Returns the port number and GID table index where
* a specified GID value occurs. Its searches only for IB link layer.
* @device: The device to query.
* @gid: The GID value to search for.
* @port_num: The port number of the device where the GID value was found.
* @index: The index into the GID table where the GID was found. This
* parameter may be NULL.
*/
int ib_find_gid(struct ib_device *device, union ib_gid *gid,
u8 *port_num, u16 *index)
{
union ib_gid tmp_gid;
int ret, port, i;
for (port = rdma_start_port(device); port <= rdma_end_port(device); ++port) {
if (!rdma_protocol_ib(device, port))
continue;
for (i = 0; i < device->port_immutable[port].gid_tbl_len; ++i) {
ret = ib_query_gid(device, port, i, &tmp_gid, NULL);
if (ret)
return ret;
if (!memcmp(&tmp_gid, gid, sizeof *gid)) {
*port_num = port;
if (index)
*index = i;
return 0;
}
}
}
return -ENOENT;
}
EXPORT_SYMBOL(ib_find_gid);
/**
* ib_find_pkey - Returns the PKey table index where a specified
* PKey value occurs.
* @device: The device to query.
* @port_num: The port number of the device to search for the PKey.
* @pkey: The PKey value to search for.
* @index: The index into the PKey table where the PKey was found.
*/
int ib_find_pkey(struct ib_device *device,
u8 port_num, u16 pkey, u16 *index)
{
int ret, i;
u16 tmp_pkey;
int partial_ix = -1;
for (i = 0; i < device->port_immutable[port_num].pkey_tbl_len; ++i) {
ret = ib_query_pkey(device, port_num, i, &tmp_pkey);
if (ret)
return ret;
if ((pkey & 0x7fff) == (tmp_pkey & 0x7fff)) {
/* if there is full-member pkey take it.*/
if (tmp_pkey & 0x8000) {
*index = i;
return 0;
}
if (partial_ix < 0)
partial_ix = i;
}
}
/*no full-member, if exists take the limited*/
if (partial_ix >= 0) {
*index = partial_ix;
return 0;
}
return -ENOENT;
}
EXPORT_SYMBOL(ib_find_pkey);
/**
* ib_get_net_dev_by_params() - Return the appropriate net_dev
* for a received CM request
* @dev: An RDMA device on which the request has been received.
* @port: Port number on the RDMA device.
* @pkey: The Pkey the request came on.
* @gid: A GID that the net_dev uses to communicate.
* @addr: Contains the IP address that the request specified as its
* destination.
*/
struct net_device *ib_get_net_dev_by_params(struct ib_device *dev,
u8 port,
u16 pkey,
const union ib_gid *gid,
const struct sockaddr *addr)
{
struct net_device *net_dev = NULL;
struct ib_client_data *context;
if (!rdma_protocol_ib(dev, port))
return NULL;
down_read(&lists_rwsem);
list_for_each_entry(context, &dev->client_data_list, list) {
struct ib_client *client = context->client;
if (context->going_down)
continue;
if (client->get_net_dev_by_params) {
net_dev = client->get_net_dev_by_params(dev, port, pkey,
gid, addr,
context->data);
if (net_dev)
break;
}
}
up_read(&lists_rwsem);
return net_dev;
}
EXPORT_SYMBOL(ib_get_net_dev_by_params);
static const struct rdma_nl_cbs ibnl_ls_cb_table[RDMA_NL_LS_NUM_OPS] = {
[RDMA_NL_LS_OP_RESOLVE] = {
.doit = ib_nl_handle_resolve_resp,
.flags = RDMA_NL_ADMIN_PERM,
},
[RDMA_NL_LS_OP_SET_TIMEOUT] = {
.doit = ib_nl_handle_set_timeout,
.flags = RDMA_NL_ADMIN_PERM,
},
[RDMA_NL_LS_OP_IP_RESOLVE] = {
.doit = ib_nl_handle_ip_res_resp,
.flags = RDMA_NL_ADMIN_PERM,
},
};
static int __init ib_core_init(void)
{
int ret;
ib_wq = alloc_workqueue("infiniband", 0, 0);
if (!ib_wq)
return -ENOMEM;
ib_comp_wq = alloc_workqueue("ib-comp-wq",
WQ_HIGHPRI | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
if (!ib_comp_wq) {
ret = -ENOMEM;
goto err;
}
ret = class_register(&ib_class);
if (ret) {
pr_warn("Couldn't create InfiniBand device class\n");
goto err_comp;
}
ret = rdma_nl_init();
if (ret) {
pr_warn("Couldn't init IB netlink interface: err %d\n", ret);
goto err_sysfs;
}
ret = addr_init();
if (ret) {
pr_warn("Could't init IB address resolution\n");
goto err_ibnl;
}
ret = ib_mad_init();
if (ret) {
pr_warn("Couldn't init IB MAD\n");
goto err_addr;
}
ret = ib_sa_init();
if (ret) {
pr_warn("Couldn't init SA\n");
goto err_mad;
}
ret = register_lsm_notifier(&ibdev_lsm_nb);
if (ret) {
pr_warn("Couldn't register LSM notifier. ret %d\n", ret);
goto err_sa;
}
nldev_init();
rdma_nl_register(RDMA_NL_LS, ibnl_ls_cb_table);
ib_cache_setup();
return 0;
err_sa:
ib_sa_cleanup();
err_mad:
ib_mad_cleanup();
err_addr:
addr_cleanup();
err_ibnl:
rdma_nl_exit();
err_sysfs:
class_unregister(&ib_class);
err_comp:
destroy_workqueue(ib_comp_wq);
err:
destroy_workqueue(ib_wq);
return ret;
}
static void __exit ib_core_cleanup(void)
{
ib_cache_cleanup();
nldev_exit();
rdma_nl_unregister(RDMA_NL_LS);
unregister_lsm_notifier(&ibdev_lsm_nb);
ib_sa_cleanup();
ib_mad_cleanup();
addr_cleanup();
rdma_nl_exit();
class_unregister(&ib_class);
destroy_workqueue(ib_comp_wq);
/* Make sure that any pending umem accounting work is done. */
destroy_workqueue(ib_wq);
}
MODULE_ALIAS_RDMA_NETLINK(RDMA_NL_LS, 4);
subsys_initcall(ib_core_init);
module_exit(ib_core_cleanup);