From: Leon Romanovsky <leonro@xxxxxxxxxxxx>
The additions of .doit callbacks posses new access pattern to the
resource entries by some user visible index. Back then, the legacy
DB was implemented as hash because per-index access wasn't needed
and XArray wasn't accepted yet.
Acceptance of XArray together with per-index access requires the refresh
of DB implementation.
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
---
drivers/infiniband/core/nldev.c | 3 +-
drivers/infiniband/core/restrack.c | 96 +++++++++++++++++++++---------
include/rdma/restrack.h | 14 ++---
3 files changed, 78 insertions(+), 35 deletions(-)
diff --git a/drivers/infiniband/core/nldev.c b/drivers/infiniband/core/nldev.c
index aa1af89a8452..1a9b03fa0832 100644
--- a/drivers/infiniband/core/nldev.c
+++ b/drivers/infiniband/core/nldev.c
@@ -981,6 +981,7 @@ static int res_get_common_dumpit(struct sk_buff *skb,
int start = cb->args[0];
bool has_cap_net_admin;
struct nlmsghdr *nlh;
+ unsigned long id = 0;
u32 index, port = 0;
bool filled = false;
@@ -1031,7 +1032,7 @@ static int res_get_common_dumpit(struct sk_buff *skb,
has_cap_net_admin = netlink_capable(cb->skb, CAP_NET_ADMIN);
down_read(&device->res.rwsem);
- hash_for_each_possible(device->res.hash, res, node, res_type) {
+ xa_for_each(&device->res.xa[res_type], res, id, ULONG_MAX, XA_PRESENT) {
if (idx < start)
goto next;
diff --git a/drivers/infiniband/core/restrack.c b/drivers/infiniband/core/restrack.c
index 46a5c553c624..473422da0856 100644
--- a/drivers/infiniband/core/restrack.c
+++ b/drivers/infiniband/core/restrack.c
@@ -20,8 +20,14 @@ static int fill_res_noop(struct sk_buff *msg,
void rdma_restrack_init(struct rdma_restrack_root *res)
{
+ int i;
+
+ for (i = 0 ; i < RDMA_RESTRACK_MAX; i++)
+ xa_init(&res->xa[i]);
+
init_rwsem(&res->rwsem);
res->fill_res_entry = fill_res_noop;
+
}
static const char *type2str(enum rdma_restrack_type type)
@@ -43,33 +49,42 @@ void rdma_restrack_clean(struct rdma_restrack_root *res)
struct rdma_restrack_entry *e;
char buf[TASK_COMM_LEN];
struct ib_device *dev;
+ bool found = false;
const char *owner;
- int bkt;
-
- if (hash_empty(res->hash))
- return;
-
- dev = container_of(res, struct ib_device, res);
- pr_err("restrack: %s", CUT_HERE);
- dev_err(&dev->dev, "BUG: RESTRACK detected leak of resources\n");
- hash_for_each(res->hash, bkt, e, node) {
- if (rdma_is_kernel_res(e)) {
- owner = e->kern_name;
- } else {
- /*
- * There is no need to call get_task_struct here,
- * because we can be here only if there are more
- * get_task_struct() call than put_task_struct().
- */
- get_task_comm(buf, e->task);
- owner = buf;
+ int i;
+
+ for (i = 0 ; i < RDMA_RESTRACK_MAX; i++) {
+ if (!xa_empty(&res->xa[i])) {
+ unsigned long index = 0;
+
+ if (!found) {
+ dev = container_of(res, struct ib_device, res);
+ pr_err("restrack: %s", CUT_HERE);
+ dev_err(&dev->dev, "BUG: RESTRACK detected leak of resources\n");
+ }
+ xa_for_each(&res->xa[i], e, index, ULONG_MAX, XA_PRESENT) {
+ if (rdma_is_kernel_res(e)) {
+ owner = e->kern_name;
+ } else {
+ /*
+ * There is no need to call get_task_struct here,
+ * because we can be here only if there are more
+ * get_task_struct() call than put_task_struct().
+ */
+ get_task_comm(buf, e->task);
+ owner = buf;
+ }
+
+ pr_err("restrack: %s %s object allocated by %s is not freed\n",
+ rdma_is_kernel_res(e) ? "Kernel" : "User",
+ type2str(e->type), owner);
+ }
+ found = true;
}
-
- pr_err("restrack: %s %s object allocated by %s is not freed\n",
- rdma_is_kernel_res(e) ? "Kernel" : "User",
- type2str(e->type), owner);
+ xa_destroy(&res->xa[i]);
}
- pr_err("restrack: %s", CUT_HERE);
+ if (!found)
+ pr_err("restrack: %s", CUT_HERE);
}
int rdma_restrack_count(struct rdma_restrack_root *res,
@@ -77,10 +92,11 @@ int rdma_restrack_count(struct rdma_restrack_root *res,
struct pid_namespace *ns)
{
struct rdma_restrack_entry *e;
+ unsigned long index = 0;
u32 cnt = 0;
down_read(&res->rwsem);
- hash_for_each_possible(res->hash, e, node, type) {
+ xa_for_each(&res->xa[type], e, index, ULONG_MAX, XA_PRESENT) {
if (ns == &init_pid_ns ||
(!rdma_is_kernel_res(e) &&
ns == task_active_pid_ns(e->task)))
@@ -154,9 +170,29 @@ void rdma_restrack_set_task(struct rdma_restrack_entry *res,
}
EXPORT_SYMBOL(rdma_restrack_set_task);
+static unsigned long res_to_id(struct rdma_restrack_entry *res)
+{
+ switch (res->type) {
+ case RDMA_RESTRACK_PD:
+ return container_of(res, struct ib_pd, res)->pdn;
+ case RDMA_RESTRACK_MR:
+ case RDMA_RESTRACK_CM_ID:
+ case RDMA_RESTRACK_CTX:
+ case RDMA_RESTRACK_CQ:
+ return (unsigned long)res;
+ case RDMA_RESTRACK_QP:
+ return container_of(res, struct ib_qp, res)->qp_num;
+ default:
+ WARN_ONCE(true, "Wrong resource tracking type %u\n", res->type);
+ return 0;
+ }
+}
+
static void rdma_restrack_add(struct rdma_restrack_entry *res)
{
struct ib_device *dev = res_to_dev(res);
+ unsigned long id;
+ int ret;
if (!dev)
return;
@@ -177,7 +213,11 @@ static void rdma_restrack_add(struct rdma_restrack_entry *res)
res->valid = true;
down_write(&dev->res.rwsem);
- hash_add(dev->res.hash, &res->node, res->type);
+ id = res_to_id(res);
+ ret = xa_insert(&dev->res.xa[res->type], id, res, GFP_KERNEL);
+ WARN_ONCE(ret == -EEXIST, "Tried to add non-unique type %d entry\n", res->type);
+ if (ret)
+ res->valid = false;
up_write(&dev->res.rwsem);
}
@@ -226,6 +266,7 @@ EXPORT_SYMBOL(rdma_restrack_put);
void rdma_restrack_del(struct rdma_restrack_entry *res)
{
struct ib_device *dev;
+ unsigned long id;
if (!res->valid)
goto out;
@@ -237,9 +278,10 @@ void rdma_restrack_del(struct rdma_restrack_entry *res)
rdma_restrack_put(res);
wait_for_completion(&res->comp);
+ id = res_to_id(res);
down_write(&dev->res.rwsem);
- hash_del(&res->node);
+ xa_erase(&dev->res.xa[res->type], id);
res->valid = false;
up_write(&dev->res.rwsem);
diff --git a/include/rdma/restrack.h b/include/rdma/restrack.h
index 8f179be9d9a9..606a0f763e50 100644
--- a/include/rdma/restrack.h
+++ b/include/rdma/restrack.h
@@ -13,6 +13,7 @@
#include <linux/completion.h>
#include <linux/sched/task.h>
#include <uapi/rdma/rdma_netlink.h>
+#include <linux/xarray.h>
/**
* enum rdma_restrack_type - HW objects to track
@@ -48,7 +49,6 @@ enum rdma_restrack_type {
RDMA_RESTRACK_MAX
};
-#define RDMA_RESTRACK_HASH_BITS 8
struct rdma_restrack_entry;
/**
@@ -61,9 +61,13 @@ struct rdma_restrack_root {
*/
struct rw_semaphore rwsem;
/**
- * @hash: global database for all resources per-device
+ * @xa: Array of XArray structures to hold restrack entries.
+ * We want to use array of XArrays becasue insertion is type
+ * dependant. For types with xisiting unique ID (like QPN),
+ * we will insert to that unique index. For other types,
+ * we insert based on pointers and auto-allocate unique index.
*/
- DECLARE_HASHTABLE(hash, RDMA_RESTRACK_HASH_BITS);
+ struct xarray xa[RDMA_RESTRACK_MAX];
/**
* @fill_res_entry: driver-specific fill function
*
@@ -108,10 +112,6 @@ struct rdma_restrack_entry {
* @kern_name: name of owner for the kernel created entities.
*/
const char *kern_name;
- /**
- * @node: hash table entry
- */
- struct hlist_node node;
/**
* @type: various objects in restrack database
*/
--
2.19.1
