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RDMA/rxe: Let pools support both keys and indices

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Allow both indices and keys to exist for objects in pools.  Previously you
were limited to one or the other.

This is required for later implementing rxe memory windows.

Link: https://lore.kernel.org/r/20201216231550.27224-3-rpearson@hpe.com
Signed-off-by: Bob Pearson <rpearson@hpe.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Bob Pearson 2020-12-16 17:15:45 -06:00 committed by Jason Gunthorpe
parent 1d11c1b7f9
commit c06ee3a014
2 changed files with 58 additions and 47 deletions
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73
drivers/infiniband/sw/rxe/rxe_pool.c
View File

@ -94,18 +94,18 @@ static int rxe_pool_init_index(struct rxe_pool *pool, u32 max, u32 min)
goto out;
}
pool->max_index = max;
pool->min_index = min;
pool->index.max_index = max;
pool->index.min_index = min;
size = BITS_TO_LONGS(max - min + 1) * sizeof(long);
pool->table = kmalloc(size, GFP_KERNEL);
if (!pool->table) {
pool->index.table = kmalloc(size, GFP_KERNEL);
if (!pool->index.table) {
err = -ENOMEM;
goto out;
}
pool->table_size = size;
bitmap_zero(pool->table, max - min + 1);
pool->index.table_size = size;
bitmap_zero(pool->index.table, max - min + 1);
out:
return err;
@ -127,7 +127,8 @@ int rxe_pool_init(
pool->max_elem = max_elem;
pool->elem_size = ALIGN(size, RXE_POOL_ALIGN);
pool->flags = rxe_type_info[type].flags;
pool->tree = RB_ROOT;
pool->index.tree = RB_ROOT;
pool->key.tree = RB_ROOT;
pool->cleanup = rxe_type_info[type].cleanup;
atomic_set(&pool->num_elem, 0);
@ -145,8 +146,8 @@ int rxe_pool_init(
}
if (rxe_type_info[type].flags & RXE_POOL_KEY) {
pool->key_offset = rxe_type_info[type].key_offset;
pool->key_size = rxe_type_info[type].key_size;
pool->key.key_offset = rxe_type_info[type].key_offset;
pool->key.key_size = rxe_type_info[type].key_size;
}
pool->state = RXE_POOL_STATE_VALID;
@ -160,7 +161,7 @@ static void rxe_pool_release(struct kref *kref)
struct rxe_pool *pool = container_of(kref, struct rxe_pool, ref_cnt);
pool->state = RXE_POOL_STATE_INVALID;
kfree(pool->table);
kfree(pool->index.table);
}
static void rxe_pool_put(struct rxe_pool *pool)
@ -185,27 +186,27 @@ void rxe_pool_cleanup(struct rxe_pool *pool)
static u32 alloc_index(struct rxe_pool *pool)
{
u32 index;
u32 range = pool->max_index - pool->min_index + 1;
u32 range = pool->index.max_index - pool->index.min_index + 1;
index = find_next_zero_bit(pool->table, range, pool->last);
index = find_next_zero_bit(pool->index.table, range, pool->index.last);
if (index >= range)
index = find_first_zero_bit(pool->table, range);
index = find_first_zero_bit(pool->index.table, range);
WARN_ON_ONCE(index >= range);
set_bit(index, pool->table);
pool->last = index;
return index + pool->min_index;
set_bit(index, pool->index.table);
pool->index.last = index;
return index + pool->index.min_index;
}
static void insert_index(struct rxe_pool *pool, struct rxe_pool_entry *new)
{
struct rb_node **link = &pool->tree.rb_node;
struct rb_node **link = &pool->index.tree.rb_node;
struct rb_node *parent = NULL;
struct rxe_pool_entry *elem;
while (*link) {
parent = *link;
elem = rb_entry(parent, struct rxe_pool_entry, node);
elem = rb_entry(parent, struct rxe_pool_entry, index_node);
if (elem->index == new->index) {
pr_warn("element already exists!\n");
@ -218,25 +219,25 @@ static void insert_index(struct rxe_pool *pool, struct rxe_pool_entry *new)
link = &(*link)->rb_right;
}
rb_link_node(&new->node, parent, link);
rb_insert_color(&new->node, &pool->tree);
rb_link_node(&new->index_node, parent, link);
rb_insert_color(&new->index_node, &pool->index.tree);
out:
return;
}
static void insert_key(struct rxe_pool *pool, struct rxe_pool_entry *new)
{
struct rb_node **link = &pool->tree.rb_node;
struct rb_node **link = &pool->key.tree.rb_node;
struct rb_node *parent = NULL;
struct rxe_pool_entry *elem;
int cmp;
while (*link) {
parent = *link;
elem = rb_entry(parent, struct rxe_pool_entry, node);
elem = rb_entry(parent, struct rxe_pool_entry, key_node);
cmp = memcmp((u8 *)elem + pool->key_offset,
(u8 *)new + pool->key_offset, pool->key_size);
cmp = memcmp((u8 *)elem + pool->key.key_offset,
(u8 *)new + pool->key.key_offset, pool->key.key_size);
if (cmp == 0) {
pr_warn("key already exists!\n");
@ -249,8 +250,8 @@ static void insert_key(struct rxe_pool *pool, struct rxe_pool_entry *new)
link = &(*link)->rb_right;
}
rb_link_node(&new->node, parent, link);
rb_insert_color(&new->node, &pool->tree);
rb_link_node(&new->key_node, parent, link);
rb_insert_color(&new->key_node, &pool->key.tree);
out:
return;
}
@ -262,7 +263,7 @@ void rxe_add_key(void *arg, void *key)
unsigned long flags;
write_lock_irqsave(&pool->pool_lock, flags);
memcpy((u8 *)elem + pool->key_offset, key, pool->key_size);
memcpy((u8 *)elem + pool->key.key_offset, key, pool->key.key_size);
insert_key(pool, elem);
write_unlock_irqrestore(&pool->pool_lock, flags);
}
@ -274,7 +275,7 @@ void rxe_drop_key(void *arg)
unsigned long flags;
write_lock_irqsave(&pool->pool_lock, flags);
rb_erase(&elem->node, &pool->tree);
rb_erase(&elem->key_node, &pool->key.tree);
write_unlock_irqrestore(&pool->pool_lock, flags);
}
@ -297,8 +298,8 @@ void rxe_drop_index(void *arg)
unsigned long flags;
write_lock_irqsave(&pool->pool_lock, flags);
clear_bit(elem->index - pool->min_index, pool->table);
rb_erase(&elem->node, &pool->tree);
clear_bit(elem->index - pool->index.min_index, pool->index.table);
rb_erase(&elem->index_node, &pool->index.tree);
write_unlock_irqrestore(&pool->pool_lock, flags);
}
@ -402,10 +403,10 @@ void *rxe_pool_get_index(struct rxe_pool *pool, u32 index)
if (pool->state != RXE_POOL_STATE_VALID)
goto out;
node = pool->tree.rb_node;
node = pool->index.tree.rb_node;
while (node) {
elem = rb_entry(node, struct rxe_pool_entry, node);
elem = rb_entry(node, struct rxe_pool_entry, index_node);
if (elem->index > index)
node = node->rb_left;
@ -434,13 +435,13 @@ void *rxe_pool_get_key(struct rxe_pool *pool, void *key)
if (pool->state != RXE_POOL_STATE_VALID)
goto out;
node = pool->tree.rb_node;
node = pool->key.tree.rb_node;
while (node) {
elem = rb_entry(node, struct rxe_pool_entry, node);
elem = rb_entry(node, struct rxe_pool_entry, key_node);
cmp = memcmp((u8 *)elem + pool->key_offset,
key, pool->key_size);
cmp = memcmp((u8 *)elem + pool->key.key_offset,
key, pool->key.key_size);
if (cmp > 0)
node = node->rb_left;

32
drivers/infiniband/sw/rxe/rxe_pool.h
View File

@ -56,8 +56,11 @@ struct rxe_pool_entry {
struct kref ref_cnt;
struct list_head list;
/* only used if indexed or keyed */
struct rb_node node;
/* only used if keyed */
struct rb_node key_node;
/* only used if indexed */
struct rb_node index_node;
u32 index;
};
@ -74,15 +77,22 @@ struct rxe_pool {
unsigned int max_elem;
atomic_t num_elem;
/* only used if indexed or keyed */
struct rb_root tree;
unsigned long *table;
size_t table_size;
u32 max_index;
u32 min_index;
u32 last;
size_t key_offset;
size_t key_size;
/* only used if indexed */
struct {
struct rb_root tree;
unsigned long *table;
size_t table_size;
u32 last;
u32 max_index;
u32 min_index;
} index;
/* only used if keyed */
struct {
struct rb_root tree;
size_t key_offset;
size_t key_size;
} key;
};
/* initialize a pool of objects with given limit on