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linux-zen-desktop/drivers/infiniband/core/cache.c

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Initial commit
2023-08-30 17:31:07 +02:00
/*
* Copyright (c) 2004 Topspin Communications. All rights reserved.
* Copyright (c) 2005 Intel Corporation. All rights reserved.
* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
* Copyright (c) 2005 Voltaire, 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/if_vlan.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/netdevice.h>
#include <net/addrconf.h>
#include <rdma/ib_cache.h>
#include "core_priv.h"
struct ib_pkey_cache {
int table_len;
u16 table[];
};
struct ib_update_work {
struct work_struct work;
struct ib_event event;
bool enforce_security;
};
union ib_gid zgid;
EXPORT_SYMBOL(zgid);
enum gid_attr_find_mask {
GID_ATTR_FIND_MASK_GID = 1UL << 0,
GID_ATTR_FIND_MASK_NETDEV = 1UL << 1,
GID_ATTR_FIND_MASK_DEFAULT = 1UL << 2,
GID_ATTR_FIND_MASK_GID_TYPE = 1UL << 3,
};
enum gid_table_entry_state {
GID_TABLE_ENTRY_INVALID = 1,
GID_TABLE_ENTRY_VALID = 2,
/*
* Indicates that entry is pending to be removed, there may
* be active users of this GID entry.
* When last user of the GID entry releases reference to it,
* GID entry is detached from the table.
*/
GID_TABLE_ENTRY_PENDING_DEL = 3,
};
struct roce_gid_ndev_storage {
struct rcu_head rcu_head;
struct net_device *ndev;
};
struct ib_gid_table_entry {
struct kref kref;
struct work_struct del_work;
struct ib_gid_attr attr;
void *context;
/* Store the ndev pointer to release reference later on in
* call_rcu context because by that time gid_table_entry
* and attr might be already freed. So keep a copy of it.
* ndev_storage is freed by rcu callback.
*/
struct roce_gid_ndev_storage *ndev_storage;
enum gid_table_entry_state state;
};
struct ib_gid_table {
int sz;
/* In RoCE, adding a GID to the table requires:
* (a) Find if this GID is already exists.
* (b) Find a free space.
* (c) Write the new GID
*
* Delete requires different set of operations:
* (a) Find the GID
* (b) Delete it.
*
**/
/* Any writer to data_vec must hold this lock and the write side of
* rwlock. Readers must hold only rwlock. All writers must be in a
* sleepable context.
*/
struct mutex lock;
/* rwlock protects data_vec[ix]->state and entry pointer.
*/
rwlock_t rwlock;
struct ib_gid_table_entry **data_vec;
/* bit field, each bit indicates the index of default GID */
u32 default_gid_indices;
};
static void dispatch_gid_change_event(struct ib_device *ib_dev, u32 port)
{
struct ib_event event;
event.device = ib_dev;
event.element.port_num = port;
event.event = IB_EVENT_GID_CHANGE;
ib_dispatch_event_clients(&event);
}
static const char * const gid_type_str[] = {
/* IB/RoCE v1 value is set for IB_GID_TYPE_IB and IB_GID_TYPE_ROCE for
* user space compatibility reasons.
*/
[IB_GID_TYPE_IB] = "IB/RoCE v1",
[IB_GID_TYPE_ROCE] = "IB/RoCE v1",
[IB_GID_TYPE_ROCE_UDP_ENCAP] = "RoCE v2",
};
const char *ib_cache_gid_type_str(enum ib_gid_type gid_type)
{
if (gid_type < ARRAY_SIZE(gid_type_str) && gid_type_str[gid_type])
return gid_type_str[gid_type];
return "Invalid GID type";
}
EXPORT_SYMBOL(ib_cache_gid_type_str);
/** rdma_is_zero_gid - Check if given GID is zero or not.
* @gid: GID to check
* Returns true if given GID is zero, returns false otherwise.
*/
bool rdma_is_zero_gid(const union ib_gid *gid)
{
return !memcmp(gid, &zgid, sizeof(*gid));
}
EXPORT_SYMBOL(rdma_is_zero_gid);
/** is_gid_index_default - Check if a given index belongs to
* reserved default GIDs or not.
* @table: GID table pointer
* @index: Index to check in GID table
* Returns true if index is one of the reserved default GID index otherwise
* returns false.
*/
static bool is_gid_index_default(const struct ib_gid_table *table,
unsigned int index)
{
return index < 32 && (BIT(index) & table->default_gid_indices);
}
int ib_cache_gid_parse_type_str(const char *buf)
{
unsigned int i;
size_t len;
int err = -EINVAL;
len = strlen(buf);
if (len == 0)
return -EINVAL;
if (buf[len - 1] == '\n')
len--;
for (i = 0; i < ARRAY_SIZE(gid_type_str); ++i)
if (gid_type_str[i] && !strncmp(buf, gid_type_str[i], len) &&
len == strlen(gid_type_str[i])) {
err = i;
break;
}
return err;
}
EXPORT_SYMBOL(ib_cache_gid_parse_type_str);
static struct ib_gid_table *rdma_gid_table(struct ib_device *device, u32 port)
{
return device->port_data[port].cache.gid;
}
static bool is_gid_entry_free(const struct ib_gid_table_entry *entry)
{
return !entry;
}
static bool is_gid_entry_valid(const struct ib_gid_table_entry *entry)
{
return entry && entry->state == GID_TABLE_ENTRY_VALID;
}
static void schedule_free_gid(struct kref *kref)
{
struct ib_gid_table_entry *entry =
container_of(kref, struct ib_gid_table_entry, kref);
queue_work(ib_wq, &entry->del_work);
}
static void put_gid_ndev(struct rcu_head *head)
{
struct roce_gid_ndev_storage *storage =
container_of(head, struct roce_gid_ndev_storage, rcu_head);
WARN_ON(!storage->ndev);
/* At this point its safe to release netdev reference,
* as all callers working on gid_attr->ndev are done
* using this netdev.
*/
dev_put(storage->ndev);
kfree(storage);
}
static void free_gid_entry_locked(struct ib_gid_table_entry *entry)
{
struct ib_device *device = entry->attr.device;
u32 port_num = entry->attr.port_num;
struct ib_gid_table *table = rdma_gid_table(device, port_num);
dev_dbg(&device->dev, "%s port=%u index=%u gid %pI6\n", __func__,
port_num, entry->attr.index, entry->attr.gid.raw);
write_lock_irq(&table->rwlock);
/*
* The only way to avoid overwriting NULL in table is
* by comparing if it is same entry in table or not!
* If new entry in table is added by the time we free here,
* don't overwrite the table entry.
*/
if (entry == table->data_vec[entry->attr.index])
table->data_vec[entry->attr.index] = NULL;
/* Now this index is ready to be allocated */
write_unlock_irq(&table->rwlock);
if (entry->ndev_storage)
call_rcu(&entry->ndev_storage->rcu_head, put_gid_ndev);
kfree(entry);
}
static void free_gid_entry(struct kref *kref)
{
struct ib_gid_table_entry *entry =
container_of(kref, struct ib_gid_table_entry, kref);
free_gid_entry_locked(entry);
}
/**
* free_gid_work - Release reference to the GID entry
* @work: Work structure to refer to GID entry which needs to be
* deleted.
*
* free_gid_work() frees the entry from the HCA's hardware table
* if provider supports it. It releases reference to netdevice.
*/
static void free_gid_work(struct work_struct *work)
{
struct ib_gid_table_entry *entry =
container_of(work, struct ib_gid_table_entry, del_work);
struct ib_device *device = entry->attr.device;
u32 port_num = entry->attr.port_num;
struct ib_gid_table *table = rdma_gid_table(device, port_num);
mutex_lock(&table->lock);
free_gid_entry_locked(entry);
mutex_unlock(&table->lock);
}
static struct ib_gid_table_entry *
alloc_gid_entry(const struct ib_gid_attr *attr)
{
struct ib_gid_table_entry *entry;
struct net_device *ndev;
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
if (!entry)
return NULL;
ndev = rcu_dereference_protected(attr->ndev, 1);
if (ndev) {
entry->ndev_storage = kzalloc(sizeof(*entry->ndev_storage),
GFP_KERNEL);
if (!entry->ndev_storage) {
kfree(entry);
return NULL;
}
dev_hold(ndev);
entry->ndev_storage->ndev = ndev;
}
kref_init(&entry->kref);
memcpy(&entry->attr, attr, sizeof(*attr));
INIT_WORK(&entry->del_work, free_gid_work);
entry->state = GID_TABLE_ENTRY_INVALID;
return entry;
}
static void store_gid_entry(struct ib_gid_table *table,
struct ib_gid_table_entry *entry)
{
entry->state = GID_TABLE_ENTRY_VALID;
dev_dbg(&entry->attr.device->dev, "%s port=%u index=%u gid %pI6\n",
__func__, entry->attr.port_num, entry->attr.index,
entry->attr.gid.raw);
lockdep_assert_held(&table->lock);
write_lock_irq(&table->rwlock);
table->data_vec[entry->attr.index] = entry;
write_unlock_irq(&table->rwlock);
}
static void get_gid_entry(struct ib_gid_table_entry *entry)
{
kref_get(&entry->kref);
}
static void put_gid_entry(struct ib_gid_table_entry *entry)
{
kref_put(&entry->kref, schedule_free_gid);
}
static void put_gid_entry_locked(struct ib_gid_table_entry *entry)
{
kref_put(&entry->kref, free_gid_entry);
}
static int add_roce_gid(struct ib_gid_table_entry *entry)
{
const struct ib_gid_attr *attr = &entry->attr;
int ret;
if (!attr->ndev) {
dev_err(&attr->device->dev, "%s NULL netdev port=%u index=%u\n",
__func__, attr->port_num, attr->index);
return -EINVAL;
}
if (rdma_cap_roce_gid_table(attr->device, attr->port_num)) {
ret = attr->device->ops.add_gid(attr, &entry->context);
if (ret) {
dev_err(&attr->device->dev,
"%s GID add failed port=%u index=%u\n",
__func__, attr->port_num, attr->index);
return ret;
}
}
return 0;
}
/**
* del_gid - Delete GID table entry
*
* @ib_dev: IB device whose GID entry to be deleted
* @port: Port number of the IB device
* @table: GID table of the IB device for a port
* @ix: GID entry index to delete
*
*/
static void del_gid(struct ib_device *ib_dev, u32 port,
struct ib_gid_table *table, int ix)
{
struct roce_gid_ndev_storage *ndev_storage;
struct ib_gid_table_entry *entry;
lockdep_assert_held(&table->lock);
dev_dbg(&ib_dev->dev, "%s port=%u index=%d gid %pI6\n", __func__, port,
ix, table->data_vec[ix]->attr.gid.raw);
write_lock_irq(&table->rwlock);
entry = table->data_vec[ix];
entry->state = GID_TABLE_ENTRY_PENDING_DEL;
/*
* For non RoCE protocol, GID entry slot is ready to use.
*/
if (!rdma_protocol_roce(ib_dev, port))
table->data_vec[ix] = NULL;
write_unlock_irq(&table->rwlock);
ndev_storage = entry->ndev_storage;
if (ndev_storage) {
entry->ndev_storage = NULL;
rcu_assign_pointer(entry->attr.ndev, NULL);
call_rcu(&ndev_storage->rcu_head, put_gid_ndev);
}
if (rdma_cap_roce_gid_table(ib_dev, port))
ib_dev->ops.del_gid(&entry->attr, &entry->context);
put_gid_entry_locked(entry);
}
/**
* add_modify_gid - Add or modify GID table entry
*
* @table: GID table in which GID to be added or modified
* @attr: Attributes of the GID
*
* Returns 0 on success or appropriate error code. It accepts zero
* GID addition for non RoCE ports for HCA's who report them as valid
* GID. However such zero GIDs are not added to the cache.
*/
static int add_modify_gid(struct ib_gid_table *table,
const struct ib_gid_attr *attr)
{
struct ib_gid_table_entry *entry;
int ret = 0;
/*
* Invalidate any old entry in the table to make it safe to write to
* this index.
*/
if (is_gid_entry_valid(table->data_vec[attr->index]))
del_gid(attr->device, attr->port_num, table, attr->index);
/*
* Some HCA's report multiple GID entries with only one valid GID, and
* leave other unused entries as the zero GID. Convert zero GIDs to
* empty table entries instead of storing them.
*/
if (rdma_is_zero_gid(&attr->gid))
return 0;
entry = alloc_gid_entry(attr);
if (!entry)
return -ENOMEM;
if (rdma_protocol_roce(attr->device, attr->port_num)) {
ret = add_roce_gid(entry);
if (ret)
goto done;
}
store_gid_entry(table, entry);
return 0;
done:
put_gid_entry(entry);
return ret;
}
/* rwlock should be read locked, or lock should be held */
static int find_gid(struct ib_gid_table *table, const union ib_gid *gid,
const struct ib_gid_attr *val, bool default_gid,
unsigned long mask, int *pempty)
{
int i = 0;
int found = -1;
int empty = pempty ? -1 : 0;
while (i < table->sz && (found < 0 || empty < 0)) {
struct ib_gid_table_entry *data = table->data_vec[i];
struct ib_gid_attr *attr;
int curr_index = i;
i++;
/* find_gid() is used during GID addition where it is expected
* to return a free entry slot which is not duplicate.
* Free entry slot is requested and returned if pempty is set,
* so lookup free slot only if requested.
*/
if (pempty && empty < 0) {
if (is_gid_entry_free(data) &&
default_gid ==
is_gid_index_default(table, curr_index)) {
/*
* Found an invalid (free) entry; allocate it.
* If default GID is requested, then our
* found slot must be one of the DEFAULT
* reserved slots or we fail.
* This ensures that only DEFAULT reserved
* slots are used for default property GIDs.
*/
empty = curr_index;
}
}
/*
* Additionally find_gid() is used to find valid entry during
* lookup operation; so ignore the entries which are marked as
* pending for removal and the entries which are marked as
* invalid.
*/
if (!is_gid_entry_valid(data))
continue;
if (found >= 0)
continue;
attr = &data->attr;
if (mask & GID_ATTR_FIND_MASK_GID_TYPE &&
attr->gid_type != val->gid_type)
continue;
if (mask & GID_ATTR_FIND_MASK_GID &&
memcmp(gid, &data->attr.gid, sizeof(*gid)))
continue;
if (mask & GID_ATTR_FIND_MASK_NETDEV &&
attr->ndev != val->ndev)
continue;
if (mask & GID_ATTR_FIND_MASK_DEFAULT &&
is_gid_index_default(table, curr_index) != default_gid)
continue;
found = curr_index;
}
if (pempty)
*pempty = empty;
return found;
}
static void make_default_gid(struct net_device *dev, union ib_gid *gid)
{
gid->global.subnet_prefix = cpu_to_be64(0xfe80000000000000LL);
addrconf_ifid_eui48(&gid->raw[8], dev);
}
static int __ib_cache_gid_add(struct ib_device *ib_dev, u32 port,
union ib_gid *gid, struct ib_gid_attr *attr,
unsigned long mask, bool default_gid)
{
struct ib_gid_table *table;
int ret = 0;
int empty;
int ix;
/* Do not allow adding zero GID in support of
* IB spec version 1.3 section 4.1.1 point (6) and
* section 12.7.10 and section 12.7.20
*/
if (rdma_is_zero_gid(gid))
return -EINVAL;
table = rdma_gid_table(ib_dev, port);
mutex_lock(&table->lock);
ix = find_gid(table, gid, attr, default_gid, mask, &empty);
if (ix >= 0)
goto out_unlock;
if (empty < 0) {
ret = -ENOSPC;
goto out_unlock;
}
attr->device = ib_dev;
attr->index = empty;
attr->port_num = port;
attr->gid = *gid;
ret = add_modify_gid(table, attr);
if (!ret)
dispatch_gid_change_event(ib_dev, port);
out_unlock:
mutex_unlock(&table->lock);
if (ret)
pr_warn("%s: unable to add gid %pI6 error=%d\n",
__func__, gid->raw, ret);
return ret;
}
int ib_cache_gid_add(struct ib_device *ib_dev, u32 port,
union ib_gid *gid, struct ib_gid_attr *attr)
{
unsigned long mask = GID_ATTR_FIND_MASK_GID |
GID_ATTR_FIND_MASK_GID_TYPE |
GID_ATTR_FIND_MASK_NETDEV;
return __ib_cache_gid_add(ib_dev, port, gid, attr, mask, false);
}
static int
_ib_cache_gid_del(struct ib_device *ib_dev, u32 port,
union ib_gid *gid, struct ib_gid_attr *attr,
unsigned long mask, bool default_gid)
{
struct ib_gid_table *table;
int ret = 0;
int ix;
table = rdma_gid_table(ib_dev, port);
mutex_lock(&table->lock);
ix = find_gid(table, gid, attr, default_gid, mask, NULL);
if (ix < 0) {
ret = -EINVAL;
goto out_unlock;
}
del_gid(ib_dev, port, table, ix);
dispatch_gid_change_event(ib_dev, port);
out_unlock:
mutex_unlock(&table->lock);
if (ret)
pr_debug("%s: can't delete gid %pI6 error=%d\n",
__func__, gid->raw, ret);
return ret;
}
int ib_cache_gid_del(struct ib_device *ib_dev, u32 port,
union ib_gid *gid, struct ib_gid_attr *attr)
{
unsigned long mask = GID_ATTR_FIND_MASK_GID |
GID_ATTR_FIND_MASK_GID_TYPE |
GID_ATTR_FIND_MASK_DEFAULT |
GID_ATTR_FIND_MASK_NETDEV;
return _ib_cache_gid_del(ib_dev, port, gid, attr, mask, false);
}
int ib_cache_gid_del_all_netdev_gids(struct ib_device *ib_dev, u32 port,
struct net_device *ndev)
{
struct ib_gid_table *table;
int ix;
bool deleted = false;
table = rdma_gid_table(ib_dev, port);
mutex_lock(&table->lock);
for (ix = 0; ix < table->sz; ix++) {
if (is_gid_entry_valid(table->data_vec[ix]) &&
table->data_vec[ix]->attr.ndev == ndev) {
del_gid(ib_dev, port, table, ix);
deleted = true;
}
}
mutex_unlock(&table->lock);
if (deleted)
dispatch_gid_change_event(ib_dev, port);
return 0;
}
/**
* rdma_find_gid_by_port - Returns the GID entry attributes when it finds
* a valid GID entry for given search parameters. It searches for the specified
* GID value in the local software cache.
* @ib_dev: The device to query.
* @gid: The GID value to search for.
* @gid_type: The GID type to search for.
* @port: The port number of the device where the GID value should be searched.
* @ndev: In RoCE, the net device of the device. NULL means ignore.
*
* Returns sgid attributes if the GID is found with valid reference or
* returns ERR_PTR for the error.
* The caller must invoke rdma_put_gid_attr() to release the reference.
*/
const struct ib_gid_attr *
rdma_find_gid_by_port(struct ib_device *ib_dev,
const union ib_gid *gid,
enum ib_gid_type gid_type,
u32 port, struct net_device *ndev)
{
int local_index;
struct ib_gid_table *table;
unsigned long mask = GID_ATTR_FIND_MASK_GID |
GID_ATTR_FIND_MASK_GID_TYPE;
struct ib_gid_attr val = {.ndev = ndev, .gid_type = gid_type};
const struct ib_gid_attr *attr;
unsigned long flags;
if (!rdma_is_port_valid(ib_dev, port))
return ERR_PTR(-ENOENT);
table = rdma_gid_table(ib_dev, port);
if (ndev)
mask |= GID_ATTR_FIND_MASK_NETDEV;
read_lock_irqsave(&table->rwlock, flags);
local_index = find_gid(table, gid, &val, false, mask, NULL);
if (local_index >= 0) {
get_gid_entry(table->data_vec[local_index]);
attr = &table->data_vec[local_index]->attr;
read_unlock_irqrestore(&table->rwlock, flags);
return attr;
}
read_unlock_irqrestore(&table->rwlock, flags);
return ERR_PTR(-ENOENT);
}
EXPORT_SYMBOL(rdma_find_gid_by_port);
/**
* rdma_find_gid_by_filter - Returns the GID table attribute where a
* specified GID value occurs
* @ib_dev: The device to query.
* @gid: The GID value to search for.
* @port: The port number of the device where the GID value could be
* searched.
* @filter: The filter function is executed on any matching GID in the table.
* If the filter function returns true, the corresponding index is returned,
* otherwise, we continue searching the GID table. It's guaranteed that
* while filter is executed, ndev field is valid and the structure won't
* change. filter is executed in an atomic context. filter must not be NULL.
* @context: Private data to pass into the call-back.
*
* rdma_find_gid_by_filter() searches for the specified GID value
* of which the filter function returns true in the port's GID table.
*
*/
const struct ib_gid_attr *rdma_find_gid_by_filter(
struct ib_device *ib_dev, const union ib_gid *gid, u32 port,
bool (*filter)(const union ib_gid *gid, const struct ib_gid_attr *,
void *),
void *context)
{
const struct ib_gid_attr *res = ERR_PTR(-ENOENT);
struct ib_gid_table *table;
unsigned long flags;
unsigned int i;
if (!rdma_is_port_valid(ib_dev, port))
return ERR_PTR(-EINVAL);
table = rdma_gid_table(ib_dev, port);
read_lock_irqsave(&table->rwlock, flags);
for (i = 0; i < table->sz; i++) {
struct ib_gid_table_entry *entry = table->data_vec[i];
if (!is_gid_entry_valid(entry))
continue;
if (memcmp(gid, &entry->attr.gid, sizeof(*gid)))
continue;
if (filter(gid, &entry->attr, context)) {
get_gid_entry(entry);
res = &entry->attr;
break;
}
}
read_unlock_irqrestore(&table->rwlock, flags);
return res;
}
static struct ib_gid_table *alloc_gid_table(int sz)
{
struct ib_gid_table *table = kzalloc(sizeof(*table), GFP_KERNEL);
if (!table)
return NULL;
table->data_vec = kcalloc(sz, sizeof(*table->data_vec), GFP_KERNEL);
if (!table->data_vec)
goto err_free_table;
mutex_init(&table->lock);
table->sz = sz;
rwlock_init(&table->rwlock);
return table;
err_free_table:
kfree(table);
return NULL;
}
static void release_gid_table(struct ib_device *device,
struct ib_gid_table *table)
{
bool leak = false;
int i;
if (!table)
return;
for (i = 0; i < table->sz; i++) {
if (is_gid_entry_free(table->data_vec[i]))
continue;
if (kref_read(&table->data_vec[i]->kref) > 1) {
dev_err(&device->dev,
"GID entry ref leak for index %d ref=%u\n", i,
kref_read(&table->data_vec[i]->kref));
leak = true;
}
}
if (leak)
return;
mutex_destroy(&table->lock);
kfree(table->data_vec);
kfree(table);
}
static void cleanup_gid_table_port(struct ib_device *ib_dev, u32 port,
struct ib_gid_table *table)
{
int i;
if (!table)
return;
mutex_lock(&table->lock);
for (i = 0; i < table->sz; ++i) {
if (is_gid_entry_valid(table->data_vec[i]))
del_gid(ib_dev, port, table, i);
}
mutex_unlock(&table->lock);
}
void ib_cache_gid_set_default_gid(struct ib_device *ib_dev, u32 port,
struct net_device *ndev,
unsigned long gid_type_mask,
enum ib_cache_gid_default_mode mode)
{
union ib_gid gid = { };
struct ib_gid_attr gid_attr;
unsigned int gid_type;
unsigned long mask;
mask = GID_ATTR_FIND_MASK_GID_TYPE |
GID_ATTR_FIND_MASK_DEFAULT |
GID_ATTR_FIND_MASK_NETDEV;
memset(&gid_attr, 0, sizeof(gid_attr));
gid_attr.ndev = ndev;
for (gid_type = 0; gid_type < IB_GID_TYPE_SIZE; ++gid_type) {
if (1UL << gid_type & ~gid_type_mask)
continue;
gid_attr.gid_type = gid_type;
if (mode == IB_CACHE_GID_DEFAULT_MODE_SET) {
make_default_gid(ndev, &gid);
__ib_cache_gid_add(ib_dev, port, &gid,
&gid_attr, mask, true);
} else if (mode == IB_CACHE_GID_DEFAULT_MODE_DELETE) {
_ib_cache_gid_del(ib_dev, port, &gid,
&gid_attr, mask, true);
}
}
}
static void gid_table_reserve_default(struct ib_device *ib_dev, u32 port,
struct ib_gid_table *table)
{
unsigned int i;
unsigned long roce_gid_type_mask;
unsigned int num_default_gids;
roce_gid_type_mask = roce_gid_type_mask_support(ib_dev, port);
num_default_gids = hweight_long(roce_gid_type_mask);
/* Reserve starting indices for default GIDs */
for (i = 0; i < num_default_gids && i < table->sz; i++)
table->default_gid_indices |= BIT(i);
}
static void gid_table_release_one(struct ib_device *ib_dev)
{
u32 p;
rdma_for_each_port (ib_dev, p) {
release_gid_table(ib_dev, ib_dev->port_data[p].cache.gid);
ib_dev->port_data[p].cache.gid = NULL;
}
}
static int _gid_table_setup_one(struct ib_device *ib_dev)
{
struct ib_gid_table *table;
u32 rdma_port;
rdma_for_each_port (ib_dev, rdma_port) {
table = alloc_gid_table(
ib_dev->port_data[rdma_port].immutable.gid_tbl_len);
if (!table)
goto rollback_table_setup;
gid_table_reserve_default(ib_dev, rdma_port, table);
ib_dev->port_data[rdma_port].cache.gid = table;
}
return 0;
rollback_table_setup:
gid_table_release_one(ib_dev);
return -ENOMEM;
}
static void gid_table_cleanup_one(struct ib_device *ib_dev)
{
u32 p;
rdma_for_each_port (ib_dev, p)
cleanup_gid_table_port(ib_dev, p,
ib_dev->port_data[p].cache.gid);
}
static int gid_table_setup_one(struct ib_device *ib_dev)
{
int err;
err = _gid_table_setup_one(ib_dev);
if (err)
return err;
rdma_roce_rescan_device(ib_dev);
return err;
}
/**
* rdma_query_gid - Read the GID content from the GID software cache
* @device: Device to query the GID
* @port_num: Port number of the device
* @index: Index of the GID table entry to read
* @gid: Pointer to GID where to store the entry's GID
*
* rdma_query_gid() only reads the GID entry content for requested device,
* port and index. It reads for IB, RoCE and iWarp link layers. It doesn't
* hold any reference to the GID table entry in the HCA or software cache.
*
* Returns 0 on success or appropriate error code.
*
*/
int rdma_query_gid(struct ib_device *device, u32 port_num,
int index, union ib_gid *gid)
{
struct ib_gid_table *table;
unsigned long flags;
int res;
if (!rdma_is_port_valid(device, port_num))
return -EINVAL;
table = rdma_gid_table(device, port_num);
read_lock_irqsave(&table->rwlock, flags);
if (index < 0 || index >= table->sz) {
res = -EINVAL;
goto done;
}
if (!is_gid_entry_valid(table->data_vec[index])) {
res = -ENOENT;
goto done;
}
memcpy(gid, &table->data_vec[index]->attr.gid, sizeof(*gid));
res = 0;
done:
read_unlock_irqrestore(&table->rwlock, flags);
return res;
}
EXPORT_SYMBOL(rdma_query_gid);
/**
* rdma_read_gid_hw_context - Read the HW GID context from GID attribute
* @attr: Potinter to the GID attribute
*
* rdma_read_gid_hw_context() reads the drivers GID HW context corresponding
* to the SGID attr. Callers are required to already be holding the reference
* to an existing GID entry.
*
* Returns the HW GID context
*
*/
void *rdma_read_gid_hw_context(const struct ib_gid_attr *attr)
{
return container_of(attr, struct ib_gid_table_entry, attr)->context;
}
EXPORT_SYMBOL(rdma_read_gid_hw_context);
/**
* rdma_find_gid - Returns SGID attributes if the matching GID is found.
* @device: The device to query.
* @gid: The GID value to search for.
* @gid_type: The GID type to search for.
* @ndev: In RoCE, the net device of the device. NULL means ignore.
*
* rdma_find_gid() searches for the specified GID value in the software cache.
*
* Returns GID attributes if a valid GID is found or returns ERR_PTR for the
* error. The caller must invoke rdma_put_gid_attr() to release the reference.
*
*/
const struct ib_gid_attr *rdma_find_gid(struct ib_device *device,
const union ib_gid *gid,
enum ib_gid_type gid_type,
struct net_device *ndev)
{
unsigned long mask = GID_ATTR_FIND_MASK_GID |
GID_ATTR_FIND_MASK_GID_TYPE;
struct ib_gid_attr gid_attr_val = {.ndev = ndev, .gid_type = gid_type};
u32 p;
if (ndev)
mask |= GID_ATTR_FIND_MASK_NETDEV;
rdma_for_each_port(device, p) {
struct ib_gid_table *table;
unsigned long flags;
int index;
table = device->port_data[p].cache.gid;
read_lock_irqsave(&table->rwlock, flags);
index = find_gid(table, gid, &gid_attr_val, false, mask, NULL);
if (index >= 0) {
const struct ib_gid_attr *attr;
get_gid_entry(table->data_vec[index]);
attr = &table->data_vec[index]->attr;
read_unlock_irqrestore(&table->rwlock, flags);
return attr;
}
read_unlock_irqrestore(&table->rwlock, flags);
}
return ERR_PTR(-ENOENT);
}
EXPORT_SYMBOL(rdma_find_gid);
int ib_get_cached_pkey(struct ib_device *device,
u32 port_num,
int index,
u16 *pkey)
{
struct ib_pkey_cache *cache;
unsigned long flags;
int ret = 0;
if (!rdma_is_port_valid(device, port_num))
return -EINVAL;
read_lock_irqsave(&device->cache_lock, flags);
cache = device->port_data[port_num].cache.pkey;
if (!cache || index < 0 || index >= cache->table_len)
ret = -EINVAL;
else
*pkey = cache->table[index];
read_unlock_irqrestore(&device->cache_lock, flags);
return ret;
}
EXPORT_SYMBOL(ib_get_cached_pkey);
void ib_get_cached_subnet_prefix(struct ib_device *device, u32 port_num,
u64 *sn_pfx)
{
unsigned long flags;
read_lock_irqsave(&device->cache_lock, flags);
*sn_pfx = device->port_data[port_num].cache.subnet_prefix;
read_unlock_irqrestore(&device->cache_lock, flags);
}
EXPORT_SYMBOL(ib_get_cached_subnet_prefix);
int ib_find_cached_pkey(struct ib_device *device, u32 port_num,
u16 pkey, u16 *index)
{
struct ib_pkey_cache *cache;
unsigned long flags;
int i;
int ret = -ENOENT;
int partial_ix = -1;
if (!rdma_is_port_valid(device, port_num))
return -EINVAL;
read_lock_irqsave(&device->cache_lock, flags);
cache = device->port_data[port_num].cache.pkey;
if (!cache) {
ret = -EINVAL;
goto err;
}
*index = -1;
for (i = 0; i < cache->table_len; ++i)
if ((cache->table[i] & 0x7fff) == (pkey & 0x7fff)) {
if (cache->table[i] & 0x8000) {
*index = i;
ret = 0;
break;
} else {
partial_ix = i;
}
}
if (ret && partial_ix >= 0) {
*index = partial_ix;
ret = 0;
}
err:
read_unlock_irqrestore(&device->cache_lock, flags);
return ret;
}
EXPORT_SYMBOL(ib_find_cached_pkey);
int ib_find_exact_cached_pkey(struct ib_device *device, u32 port_num,
u16 pkey, u16 *index)
{
struct ib_pkey_cache *cache;
unsigned long flags;
int i;
int ret = -ENOENT;
if (!rdma_is_port_valid(device, port_num))
return -EINVAL;
read_lock_irqsave(&device->cache_lock, flags);
cache = device->port_data[port_num].cache.pkey;
if (!cache) {
ret = -EINVAL;
goto err;
}
*index = -1;
for (i = 0; i < cache->table_len; ++i)
if (cache->table[i] == pkey) {
*index = i;
ret = 0;
break;
}
err:
read_unlock_irqrestore(&device->cache_lock, flags);
return ret;
}
EXPORT_SYMBOL(ib_find_exact_cached_pkey);
int ib_get_cached_lmc(struct ib_device *device, u32 port_num, u8 *lmc)
{
unsigned long flags;
int ret = 0;
if (!rdma_is_port_valid(device, port_num))
return -EINVAL;
read_lock_irqsave(&device->cache_lock, flags);
*lmc = device->port_data[port_num].cache.lmc;
read_unlock_irqrestore(&device->cache_lock, flags);
return ret;
}
EXPORT_SYMBOL(ib_get_cached_lmc);
int ib_get_cached_port_state(struct ib_device *device, u32 port_num,
enum ib_port_state *port_state)
{
unsigned long flags;
int ret = 0;
if (!rdma_is_port_valid(device, port_num))
return -EINVAL;
read_lock_irqsave(&device->cache_lock, flags);
*port_state = device->port_data[port_num].cache.port_state;
read_unlock_irqrestore(&device->cache_lock, flags);
return ret;
}
EXPORT_SYMBOL(ib_get_cached_port_state);
/**
* rdma_get_gid_attr - Returns GID attributes for a port of a device
* at a requested gid_index, if a valid GID entry exists.
* @device: The device to query.
* @port_num: The port number on the device where the GID value
* is to be queried.
* @index: Index of the GID table entry whose attributes are to
* be queried.
*
* rdma_get_gid_attr() acquires reference count of gid attributes from the
* cached GID table. Caller must invoke rdma_put_gid_attr() to release
* reference to gid attribute regardless of link layer.
*
* Returns pointer to valid gid attribute or ERR_PTR for the appropriate error
* code.
*/
const struct ib_gid_attr *
rdma_get_gid_attr(struct ib_device *device, u32 port_num, int index)
{
const struct ib_gid_attr *attr = ERR_PTR(-ENODATA);
struct ib_gid_table *table;
unsigned long flags;
if (!rdma_is_port_valid(device, port_num))
return ERR_PTR(-EINVAL);
table = rdma_gid_table(device, port_num);
if (index < 0 || index >= table->sz)
return ERR_PTR(-EINVAL);
read_lock_irqsave(&table->rwlock, flags);
if (!is_gid_entry_valid(table->data_vec[index]))
goto done;
get_gid_entry(table->data_vec[index]);
attr = &table->data_vec[index]->attr;
done:
read_unlock_irqrestore(&table->rwlock, flags);
return attr;
}
EXPORT_SYMBOL(rdma_get_gid_attr);
/**
* rdma_query_gid_table - Reads GID table entries of all the ports of a device up to max_entries.
* @device: The device to query.
* @entries: Entries where GID entries are returned.
* @max_entries: Maximum number of entries that can be returned.
* Entries array must be allocated to hold max_entries number of entries.
*
* Returns number of entries on success or appropriate error code.
*/
ssize_t rdma_query_gid_table(struct ib_device *device,
struct ib_uverbs_gid_entry *entries,
size_t max_entries)
{
const struct ib_gid_attr *gid_attr;
ssize_t num_entries = 0, ret;
struct ib_gid_table *table;
u32 port_num, i;
struct net_device *ndev;
unsigned long flags;
rdma_for_each_port(device, port_num) {
table = rdma_gid_table(device, port_num);
read_lock_irqsave(&table->rwlock, flags);
for (i = 0; i < table->sz; i++) {
if (!is_gid_entry_valid(table->data_vec[i]))
continue;
if (num_entries >= max_entries) {
ret = -EINVAL;
goto err;
}
gid_attr = &table->data_vec[i]->attr;
memcpy(&entries->gid, &gid_attr->gid,
sizeof(gid_attr->gid));
entries->gid_index = gid_attr->index;
entries->port_num = gid_attr->port_num;
entries->gid_type = gid_attr->gid_type;
ndev = rcu_dereference_protected(
gid_attr->ndev,
lockdep_is_held(&table->rwlock));
if (ndev)
entries->netdev_ifindex = ndev->ifindex;
num_entries++;
entries++;
}
read_unlock_irqrestore(&table->rwlock, flags);
}
return num_entries;
err:
read_unlock_irqrestore(&table->rwlock, flags);
return ret;
}
EXPORT_SYMBOL(rdma_query_gid_table);
/**
* rdma_put_gid_attr - Release reference to the GID attribute
* @attr: Pointer to the GID attribute whose reference
* needs to be released.
*
* rdma_put_gid_attr() must be used to release reference whose
* reference is acquired using rdma_get_gid_attr() or any APIs
* which returns a pointer to the ib_gid_attr regardless of link layer
* of IB or RoCE.
*
*/
void rdma_put_gid_attr(const struct ib_gid_attr *attr)
{
struct ib_gid_table_entry *entry =
container_of(attr, struct ib_gid_table_entry, attr);
put_gid_entry(entry);
}
EXPORT_SYMBOL(rdma_put_gid_attr);
/**
* rdma_hold_gid_attr - Get reference to existing GID attribute
*
* @attr: Pointer to the GID attribute whose reference
* needs to be taken.
*
* Increase the reference count to a GID attribute to keep it from being
* freed. Callers are required to already be holding a reference to attribute.
*
*/
void rdma_hold_gid_attr(const struct ib_gid_attr *attr)
{
struct ib_gid_table_entry *entry =
container_of(attr, struct ib_gid_table_entry, attr);
get_gid_entry(entry);
}
EXPORT_SYMBOL(rdma_hold_gid_attr);
/**
* rdma_read_gid_attr_ndev_rcu - Read GID attribute netdevice
* which must be in UP state.
*
* @attr:Pointer to the GID attribute
*
* Returns pointer to netdevice if the netdevice was attached to GID and
* netdevice is in UP state. Caller must hold RCU lock as this API
* reads the netdev flags which can change while netdevice migrates to
* different net namespace. Returns ERR_PTR with error code otherwise.
*
*/
struct net_device *rdma_read_gid_attr_ndev_rcu(const struct ib_gid_attr *attr)
{
struct ib_gid_table_entry *entry =
container_of(attr, struct ib_gid_table_entry, attr);
struct ib_device *device = entry->attr.device;
struct net_device *ndev = ERR_PTR(-EINVAL);
u32 port_num = entry->attr.port_num;
struct ib_gid_table *table;
unsigned long flags;
bool valid;
table = rdma_gid_table(device, port_num);
read_lock_irqsave(&table->rwlock, flags);
valid = is_gid_entry_valid(table->data_vec[attr->index]);
if (valid) {
ndev = rcu_dereference(attr->ndev);
if (!ndev)
ndev = ERR_PTR(-ENODEV);
}
read_unlock_irqrestore(&table->rwlock, flags);
return ndev;
}
EXPORT_SYMBOL(rdma_read_gid_attr_ndev_rcu);
static int get_lower_dev_vlan(struct net_device *lower_dev,
struct netdev_nested_priv *priv)
{
u16 *vlan_id = (u16 *)priv->data;
if (is_vlan_dev(lower_dev))
*vlan_id = vlan_dev_vlan_id(lower_dev);
/* We are interested only in first level vlan device, so
* always return 1 to stop iterating over next level devices.
*/
return 1;
}
/**
* rdma_read_gid_l2_fields - Read the vlan ID and source MAC address
* of a GID entry.
*
* @attr: GID attribute pointer whose L2 fields to be read
* @vlan_id: Pointer to vlan id to fill up if the GID entry has
* vlan id. It is optional.
* @smac: Pointer to smac to fill up for a GID entry. It is optional.
*
* rdma_read_gid_l2_fields() returns 0 on success and returns vlan id
* (if gid entry has vlan) and source MAC, or returns error.
*/
int rdma_read_gid_l2_fields(const struct ib_gid_attr *attr,
u16 *vlan_id, u8 *smac)
{
struct netdev_nested_priv priv = {
.data = (void *)vlan_id,
};
struct net_device *ndev;
rcu_read_lock();
ndev = rcu_dereference(attr->ndev);
if (!ndev) {
rcu_read_unlock();
return -ENODEV;
}
if (smac)
ether_addr_copy(smac, ndev->dev_addr);
if (vlan_id) {
*vlan_id = 0xffff;
if (is_vlan_dev(ndev)) {
*vlan_id = vlan_dev_vlan_id(ndev);
} else {
/* If the netdev is upper device and if it's lower
* device is vlan device, consider vlan id of
* the lower vlan device for this gid entry.
*/
netdev_walk_all_lower_dev_rcu(attr->ndev,
get_lower_dev_vlan, &priv);
}
}
rcu_read_unlock();
return 0;
}
EXPORT_SYMBOL(rdma_read_gid_l2_fields);
static int config_non_roce_gid_cache(struct ib_device *device,
u32 port, struct ib_port_attr *tprops)
{
struct ib_gid_attr gid_attr = {};
struct ib_gid_table *table;
int ret = 0;
int i;
gid_attr.device = device;
gid_attr.port_num = port;
table = rdma_gid_table(device, port);
mutex_lock(&table->lock);
for (i = 0; i < tprops->gid_tbl_len; ++i) {
if (!device->ops.query_gid)
continue;
ret = device->ops.query_gid(device, port, i, &gid_attr.gid);
if (ret) {
dev_warn(&device->dev,
"query_gid failed (%d) for index %d\n", ret,
i);
goto err;
}
gid_attr.index = i;
tprops->subnet_prefix =
be64_to_cpu(gid_attr.gid.global.subnet_prefix);
add_modify_gid(table, &gid_attr);
}
err:
mutex_unlock(&table->lock);
return ret;
}
static int
ib_cache_update(struct ib_device *device, u32 port, bool update_gids,
bool update_pkeys, bool enforce_security)
{
struct ib_port_attr *tprops = NULL;
struct ib_pkey_cache *pkey_cache = NULL;
struct ib_pkey_cache *old_pkey_cache = NULL;
int i;
int ret;
if (!rdma_is_port_valid(device, port))
return -EINVAL;
tprops = kmalloc(sizeof *tprops, GFP_KERNEL);
if (!tprops)
return -ENOMEM;
ret = ib_query_port(device, port, tprops);
if (ret) {
dev_warn(&device->dev, "ib_query_port failed (%d)\n", ret);
goto err;
}
if (!rdma_protocol_roce(device, port) && update_gids) {
ret = config_non_roce_gid_cache(device, port,
tprops);
if (ret)
goto err;
}
update_pkeys &= !!tprops->pkey_tbl_len;
if (update_pkeys) {
pkey_cache = kmalloc(struct_size(pkey_cache, table,
tprops->pkey_tbl_len),
GFP_KERNEL);
if (!pkey_cache) {
ret = -ENOMEM;
goto err;
}
pkey_cache->table_len = tprops->pkey_tbl_len;
for (i = 0; i < pkey_cache->table_len; ++i) {
ret = ib_query_pkey(device, port, i,
pkey_cache->table + i);
if (ret) {
dev_warn(&device->dev,
"ib_query_pkey failed (%d) for index %d\n",
ret, i);
goto err;
}
}
}
write_lock_irq(&device->cache_lock);
if (update_pkeys) {
old_pkey_cache = device->port_data[port].cache.pkey;
device->port_data[port].cache.pkey = pkey_cache;
}
device->port_data[port].cache.lmc = tprops->lmc;
device->port_data[port].cache.port_state = tprops->state;
device->port_data[port].cache.subnet_prefix = tprops->subnet_prefix;
write_unlock_irq(&device->cache_lock);
if (enforce_security)
ib_security_cache_change(device,
port,
tprops->subnet_prefix);
kfree(old_pkey_cache);
kfree(tprops);
return 0;
err:
kfree(pkey_cache);
kfree(tprops);
return ret;
}
static void ib_cache_event_task(struct work_struct *_work)
{
struct ib_update_work *work =
container_of(_work, struct ib_update_work, work);
int ret;
/* Before distributing the cache update event, first sync
* the cache.
*/
ret = ib_cache_update(work->event.device, work->event.element.port_num,
work->event.event == IB_EVENT_GID_CHANGE,
work->event.event == IB_EVENT_PKEY_CHANGE,
work->enforce_security);
/* GID event is notified already for individual GID entries by
* dispatch_gid_change_event(). Hence, notifiy for rest of the
* events.
*/
if (!ret && work->event.event != IB_EVENT_GID_CHANGE)
ib_dispatch_event_clients(&work->event);
kfree(work);
}
static void ib_generic_event_task(struct work_struct *_work)
{
struct ib_update_work *work =
container_of(_work, struct ib_update_work, work);
ib_dispatch_event_clients(&work->event);
kfree(work);
}
static bool is_cache_update_event(const struct ib_event *event)
{
return (event->event == IB_EVENT_PORT_ERR ||
event->event == IB_EVENT_PORT_ACTIVE ||
event->event == IB_EVENT_LID_CHANGE ||
event->event == IB_EVENT_PKEY_CHANGE ||
event->event == IB_EVENT_CLIENT_REREGISTER ||
event->event == IB_EVENT_GID_CHANGE);
}
/**
* 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(const struct ib_event *event)
{
struct ib_update_work *work;
work = kzalloc(sizeof(*work), GFP_ATOMIC);
if (!work)
return;
if (is_cache_update_event(event))
INIT_WORK(&work->work, ib_cache_event_task);
else
INIT_WORK(&work->work, ib_generic_event_task);
work->event = *event;
if (event->event == IB_EVENT_PKEY_CHANGE ||
event->event == IB_EVENT_GID_CHANGE)
work->enforce_security = true;
queue_work(ib_wq, &work->work);
}
EXPORT_SYMBOL(ib_dispatch_event);
int ib_cache_setup_one(struct ib_device *device)
{
u32 p;
int err;
err = gid_table_setup_one(device);
if (err)
return err;
rdma_for_each_port (device, p) {
err = ib_cache_update(device, p, true, true, true);
if (err)
return err;
}
return 0;
}
void ib_cache_release_one(struct ib_device *device)
{
u32 p;
/*
* The release function frees all the cache elements.
* This function should be called as part of freeing
* all the device's resources when the cache could no
* longer be accessed.
*/
rdma_for_each_port (device, p)
kfree(device->port_data[p].cache.pkey);
gid_table_release_one(device);
}
void ib_cache_cleanup_one(struct ib_device *device)
{
/* The cleanup function waits for all in-progress workqueue
* elements and cleans up the GID cache. This function should be
* called after the device was removed from the devices list and
* all clients were removed, so the cache exists but is
* non-functional and shouldn't be updated anymore.
*/
flush_workqueue(ib_wq);
gid_table_cleanup_one(device);
/*
* Flush the wq second time for any pending GID delete work.
*/
flush_workqueue(ib_wq);
}