Currently, the cache structure is a static linear array. Therefore, his
size is limited to the number of entries in it and is not expandable.
The entries are dedicated to mkeys of size 2^x and no
access_flags. Mkeys with different properties are not cacheable.
In this patch, we change the cache structure to an RB-tree.
This will allow to extend the cache to support more entries with
different mkey properties.
Signed-off-by: Michael Guralnik <michaelgur@xxxxxxxxxx>
Change-Id: Ie99a44f7151770c905a5d04b94f43b38b14cd796
---
drivers/infiniband/hw/mlx5/mlx5_ib.h | 11 +-
drivers/infiniband/hw/mlx5/mr.c | 160 ++++++++++++++++++++-------
drivers/infiniband/hw/mlx5/odp.c | 8 +-
3 files changed, 132 insertions(+), 47 deletions(-)
diff --git a/drivers/infiniband/hw/mlx5/mlx5_ib.h b/drivers/infiniband/hw/mlx5/mlx5_ib.h
index 8d985f792367..eec16db2d536 100644
--- a/drivers/infiniband/hw/mlx5/mlx5_ib.h
+++ b/drivers/infiniband/hw/mlx5/mlx5_ib.h
@@ -741,6 +741,8 @@ struct mlx5_cache_ent {
u32 access_mode;
unsigned int ndescs;
+ struct rb_node node;
+
u8 disabled:1;
u8 fill_to_high_water:1;
@@ -770,8 +772,9 @@ struct mlx5r_async_create_mkey {
struct mlx5_mkey_cache {
struct workqueue_struct *wq;
- struct mlx5_cache_ent ent[MAX_MKEY_CACHE_ENTRIES];
- struct dentry *root;
+ struct rb_root rb_root;
+ struct mutex rb_lock;
+ struct dentry *fs_root;
unsigned long last_add;
};
@@ -1316,11 +1319,15 @@ void mlx5_ib_copy_pas(u64 *old, u64 *new, int step, int num);
int mlx5_ib_get_cqe_size(struct ib_cq *ibcq);
int mlx5_mkey_cache_init(struct mlx5_ib_dev *dev);
int mlx5_mkey_cache_cleanup(struct mlx5_ib_dev *dev);
+struct mlx5_cache_ent *mlx5r_cache_create_ent(struct mlx5_ib_dev *dev,
+ int order);
struct mlx5_ib_mr *mlx5_mr_cache_alloc(struct mlx5_ib_dev *dev,
struct mlx5_cache_ent *ent,
int access_flags);
+struct mlx5_ib_mr *mlx5_mr_cache_alloc_order(struct mlx5_ib_dev *dev, u32 order,
+ int access_flags);
int mlx5_ib_check_mr_status(struct ib_mr *ibmr, u32 check_mask,
struct ib_mr_status *mr_status);
struct ib_wq *mlx5_ib_create_wq(struct ib_pd *pd,
diff --git a/drivers/infiniband/hw/mlx5/mr.c b/drivers/infiniband/hw/mlx5/mr.c
index 356c99d7ec9a..5cc618db277f 100644
--- a/drivers/infiniband/hw/mlx5/mr.c
+++ b/drivers/infiniband/hw/mlx5/mr.c
@@ -515,18 +515,22 @@ static const struct file_operations limit_fops = {
static bool someone_adding(struct mlx5_mkey_cache *cache)
{
- unsigned int i;
-
- for (i = 0; i < MAX_MKEY_CACHE_ENTRIES; i++) {
- struct mlx5_cache_ent *ent = &cache->ent[i];
- bool ret;
+ struct mlx5_cache_ent *ent;
+ struct rb_node *node;
+ bool ret;
+ mutex_lock(&cache->rb_lock);
+ for (node = rb_first(&cache->rb_root); node; node = rb_next(node)) {
+ ent = rb_entry(node, struct mlx5_cache_ent, node);
xa_lock_irq(&ent->mkeys);
ret = ent->stored < ent->limit;
xa_unlock_irq(&ent->mkeys);
- if (ret)
+ if (ret) {
+ mutex_unlock(&cache->rb_lock);
return true;
+ }
}
+ mutex_unlock(&cache->rb_lock);
return false;
}
@@ -637,6 +641,59 @@ static void delayed_cache_work_func(struct work_struct *work)
__cache_work_func(ent);
}
+static int mlx5_cache_ent_insert(struct mlx5_mkey_cache *cache,
+ struct mlx5_cache_ent *ent)
+{
+ struct rb_node **new = &cache->rb_root.rb_node, *parent = NULL;
+ struct mlx5_cache_ent *cur;
+
+ mutex_lock(&cache->rb_lock);
+ /* Figure out where to put new node */
+ while (*new) {
+ cur = rb_entry(*new, struct mlx5_cache_ent, node);
+ parent = *new;
+ if (ent->order < cur->order)
+ new = &((*new)->rb_left);
+ if (ent->order > cur->order)
+ new = &((*new)->rb_right);
+ if (ent->order == cur->order) {
+ mutex_unlock(&cache->rb_lock);
+ return -EEXIST;
+ }
+ }
+
+ /* Add new node and rebalance tree. */
+ rb_link_node(&ent->node, parent, new);
+ rb_insert_color(&ent->node, &cache->rb_root);
+
+ mutex_unlock(&cache->rb_lock);
+ return 0;
+}
+
+static struct mlx5_cache_ent *mkey_cache_ent_from_order(struct mlx5_ib_dev *dev,
+ unsigned int order)
+{
+ struct rb_node *node = dev->cache.rb_root.rb_node;
+ struct mlx5_cache_ent *cur, *smallest = NULL;
+
+ /*
+ * Find the smallest ent with order >= requested_order.
+ */
+ while (node) {
+ cur = rb_entry(node, struct mlx5_cache_ent, node);
+ if (cur->order > order) {
+ smallest = cur;
+ node = node->rb_left;
+ }
+ if (cur->order < order)
+ node = node->rb_right;
+ if (cur->order == order)
+ return cur;
+ }
+
+ return smallest;
+}
+
struct mlx5_ib_mr *mlx5_mr_cache_alloc(struct mlx5_ib_dev *dev,
struct mlx5_cache_ent *ent,
int access_flags)
@@ -677,10 +734,16 @@ struct mlx5_ib_mr *mlx5_mr_cache_alloc(struct mlx5_ib_dev *dev,
return mr;
}
-static void clean_keys(struct mlx5_ib_dev *dev, int c)
+struct mlx5_ib_mr *mlx5_mr_cache_alloc_order(struct mlx5_ib_dev *dev,
+ u32 order, int access_flags)
+{
+ struct mlx5_cache_ent *ent = mkey_cache_ent_from_order(dev, order);
+
+ return mlx5_mr_cache_alloc(dev, ent, access_flags);
+}
+
+static void clean_keys(struct mlx5_ib_dev *dev, struct mlx5_cache_ent *ent)
{
- struct mlx5_mkey_cache *cache = &dev->cache;
- struct mlx5_cache_ent *ent = &cache->ent[c];
u32 mkey;
cancel_delayed_work(&ent->dwork);
@@ -699,8 +762,8 @@ static void mlx5_mkey_cache_debugfs_cleanup(struct mlx5_ib_dev *dev)
if (!mlx5_debugfs_root || dev->is_rep)
return;
- debugfs_remove_recursive(dev->cache.root);
- dev->cache.root = NULL;
+ debugfs_remove_recursive(dev->cache.fs_root);
+ dev->cache.fs_root = NULL;
}
static void mlx5_mkey_cache_debugfs_init(struct mlx5_ib_dev *dev)
@@ -713,12 +776,13 @@ static void mlx5_mkey_cache_debugfs_init(struct mlx5_ib_dev *dev)
if (!mlx5_debugfs_root || dev->is_rep)
return;
- cache->root = debugfs_create_dir("mr_cache", mlx5_debugfs_get_dev_root(dev->mdev));
+ dir = mlx5_debugfs_get_dev_root(dev->mdev);
+ cache->fs_root = debugfs_create_dir("mr_cache", dir);
for (i = 0; i < MAX_MKEY_CACHE_ENTRIES; i++) {
- ent = &cache->ent[i];
+ ent = mkey_cache_ent_from_order(dev, i);
sprintf(ent->name, "%d", ent->order);
- dir = debugfs_create_dir(ent->name, cache->root);
+ dir = debugfs_create_dir(ent->name, cache->fs_root);
debugfs_create_file("size", 0600, dir, ent, &size_fops);
debugfs_create_file("limit", 0600, dir, ent, &limit_fops);
debugfs_create_ulong("cur", 0400, dir, &ent->stored);
@@ -733,6 +797,30 @@ static void delay_time_func(struct timer_list *t)
WRITE_ONCE(dev->fill_delay, 0);
}
+struct mlx5_cache_ent *mlx5r_cache_create_ent(struct mlx5_ib_dev *dev,
+ int order)
+{
+ struct mlx5_cache_ent *ent;
+ int ret;
+
+ ent = kzalloc(sizeof(*ent), GFP_KERNEL);
+ if (!ent)
+ return ERR_PTR(-ENOMEM);
+
+ xa_init_flags(&ent->mkeys, XA_FLAGS_LOCK_IRQ);
+ ent->order = order;
+ ent->dev = dev;
+
+ INIT_DELAYED_WORK(&ent->dwork, delayed_cache_work_func);
+
+ ret = mlx5_cache_ent_insert(&dev->cache, ent);
+ if (ret) {
+ kfree(ent);
+ return ERR_PTR(ret);
+ }
+ return ent;
+}
+
int mlx5_mkey_cache_init(struct mlx5_ib_dev *dev)
{
struct mlx5_mkey_cache *cache = &dev->cache;
@@ -740,6 +828,8 @@ int mlx5_mkey_cache_init(struct mlx5_ib_dev *dev)
int i;
mutex_init(&dev->slow_path_mutex);
+ mutex_init(&dev->cache.rb_lock);
+ dev->cache.rb_root = RB_ROOT;
cache->wq = alloc_ordered_workqueue("mkey_cache", WQ_MEM_RECLAIM);
if (!cache->wq) {
mlx5_ib_warn(dev, "failed to create work queue\n");
@@ -749,13 +839,7 @@ int mlx5_mkey_cache_init(struct mlx5_ib_dev *dev)
mlx5_cmd_init_async_ctx(dev->mdev, &dev->async_ctx);
timer_setup(&dev->delay_timer, delay_time_func, 0);
for (i = 0; i < MAX_MKEY_CACHE_ENTRIES; i++) {
- ent = &cache->ent[i];
- xa_init_flags(&ent->mkeys, XA_FLAGS_LOCK_IRQ);
- ent->order = i + 2;
- ent->dev = dev;
- ent->limit = 0;
-
- INIT_DELAYED_WORK(&ent->dwork, delayed_cache_work_func);
+ ent = mlx5r_cache_create_ent(dev, i);
if (i > MKEY_CACHE_LAST_STD_ENTRY) {
mlx5_odp_init_mkey_cache_entry(ent);
@@ -785,14 +869,16 @@ int mlx5_mkey_cache_init(struct mlx5_ib_dev *dev)
int mlx5_mkey_cache_cleanup(struct mlx5_ib_dev *dev)
{
- unsigned int i;
+ struct rb_root *root = &dev->cache.rb_root;
+ struct mlx5_cache_ent *ent;
+ struct rb_node *node;
if (!dev->cache.wq)
return 0;
- for (i = 0; i < MAX_MKEY_CACHE_ENTRIES; i++) {
- struct mlx5_cache_ent *ent = &dev->cache.ent[i];
-
+ mutex_lock(&dev->cache.rb_lock);
+ for (node = rb_first(root); node; node = rb_next(node)) {
+ ent = rb_entry(node, struct mlx5_cache_ent, node);
xa_lock_irq(&ent->mkeys);
ent->disabled = true;
xa_unlock_irq(&ent->mkeys);
@@ -802,8 +888,15 @@ int mlx5_mkey_cache_cleanup(struct mlx5_ib_dev *dev)
mlx5_mkey_cache_debugfs_cleanup(dev);
mlx5_cmd_cleanup_async_ctx(&dev->async_ctx);
- for (i = 0; i < MAX_MKEY_CACHE_ENTRIES; i++)
- clean_keys(dev, i);
+ node = rb_first(root);
+ while (node) {
+ ent = rb_entry(node, struct mlx5_cache_ent, node);
+ node = rb_next(node);
+ clean_keys(dev, ent);
+ rb_erase(&ent->node, root);
+ kfree(ent);
+ }
+ mutex_unlock(&dev->cache.rb_lock);
destroy_workqueue(dev->cache.wq);
del_timer_sync(&dev->delay_timer);
@@ -876,19 +969,6 @@ static int mkey_cache_max_order(struct mlx5_ib_dev *dev)
return MLX5_MAX_UMR_SHIFT;
}
-static struct mlx5_cache_ent *mkey_cache_ent_from_order(struct mlx5_ib_dev *dev,
- unsigned int order)
-{
- struct mlx5_mkey_cache *cache = &dev->cache;
-
- if (order < cache->ent[0].order)
- return &cache->ent[0];
- order = order - cache->ent[0].order;
- if (order > MKEY_CACHE_LAST_STD_ENTRY)
- return NULL;
- return &cache->ent[order];
-}
-
static void set_mr_fields(struct mlx5_ib_dev *dev, struct mlx5_ib_mr *mr,
u64 length, int access_flags, u64 iova)
{
diff --git a/drivers/infiniband/hw/mlx5/odp.c b/drivers/infiniband/hw/mlx5/odp.c
index 72044f8ec883..71c3c611e10a 100644
--- a/drivers/infiniband/hw/mlx5/odp.c
+++ b/drivers/infiniband/hw/mlx5/odp.c
@@ -419,8 +419,7 @@ static struct mlx5_ib_mr *implicit_get_child_mr(struct mlx5_ib_mr *imr,
return ERR_CAST(odp);
BUILD_BUG_ON(order > MKEY_CACHE_LAST_STD_ENTRY);
- mr = mlx5_mr_cache_alloc(dev, &dev->cache.ent[order],
- imr->access_flags);
+ mr = mlx5_mr_cache_alloc_order(dev, order, imr->access_flags);
if (IS_ERR(mr)) {
ib_umem_odp_release(odp);
return mr;
@@ -494,9 +493,8 @@ struct mlx5_ib_mr *mlx5_ib_alloc_implicit_mr(struct mlx5_ib_pd *pd,
if (IS_ERR(umem_odp))
return ERR_CAST(umem_odp);
- imr = mlx5_mr_cache_alloc(dev,
- &dev->cache.ent[MLX5_IMR_KSM_CACHE_ENTRY],
- access_flags);
+ imr = mlx5_mr_cache_alloc_order(dev, MLX5_IMR_KSM_CACHE_ENTRY,
+ access_flags);
if (IS_ERR(imr)) {
ib_umem_odp_release(umem_odp);
return imr;
--
2.17.2
