From: Jason Gunthorpe <jgg@mellanox.com>
Date: Tue, 3 Apr 2018 07:52:04 +0300
Subject: RDMA/rdma_cm: Delete rdma_addr_client
Patch-mainline: v4.18-rc1
Git-commit: ee6548d1d98df7df3b9c8103a42cf68b31c29417
References: bsc#1103992 FATE#326009
The only thing it does is block module unload while work is posted from
rdma_resolve_ip().
However, this is not the right place to do this. The users of
rdma_resolve_ip() must ensure their own module does not unload until
rdma_resolve_ip() calls the callback, or until rdma_addr_cancel() is
called.
Similarly callers to rdma_addr_find_l2_eth_by_grh() must ensure their
module does not unload while they are calling code.
The only two users are already safe, so there is no need for this.
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/infiniband/core/addr.c | 38 ++++----------------------------------
drivers/infiniband/core/cma.c | 6 +-----
include/rdma/ib_addr.h | 20 +-------------------
3 files changed, 6 insertions(+), 58 deletions(-)
--- a/drivers/infiniband/core/addr.c
+++ b/drivers/infiniband/core/addr.c
@@ -56,7 +56,6 @@ struct addr_req {
struct sockaddr_storage src_addr;
struct sockaddr_storage dst_addr;
struct rdma_dev_addr *addr;
- struct rdma_addr_client *client;
void *context;
void (*callback)(int status, struct sockaddr *src_addr,
struct rdma_dev_addr *addr, void *context);
@@ -220,28 +219,6 @@ int rdma_addr_size_kss(struct __kernel_s
}
EXPORT_SYMBOL(rdma_addr_size_kss);
-static struct rdma_addr_client self;
-
-void rdma_addr_register_client(struct rdma_addr_client *client)
-{
- atomic_set(&client->refcount, 1);
- init_completion(&client->comp);
-}
-EXPORT_SYMBOL(rdma_addr_register_client);
-
-static inline void put_client(struct rdma_addr_client *client)
-{
- if (atomic_dec_and_test(&client->refcount))
- complete(&client->comp);
-}
-
-void rdma_addr_unregister_client(struct rdma_addr_client *client)
-{
- put_client(client);
- wait_for_completion(&client->comp);
-}
-EXPORT_SYMBOL(rdma_addr_unregister_client);
-
void rdma_copy_addr(struct rdma_dev_addr *dev_addr,
const struct net_device *dev,
const unsigned char *dst_dev_addr)
@@ -605,14 +582,12 @@ static void process_one_req(struct work_
*/
cancel_delayed_work(&req->work);
list_del_init(&req->list);
- put_client(req->client);
kfree(req);
}
spin_unlock_bh(&lock);
}
-int rdma_resolve_ip(struct rdma_addr_client *client,
- struct sockaddr *src_addr, struct sockaddr *dst_addr,
+int rdma_resolve_ip(struct sockaddr *src_addr, struct sockaddr *dst_addr,
struct rdma_dev_addr *addr, int timeout_ms,
void (*callback)(int status, struct sockaddr *src_addr,
struct rdma_dev_addr *addr, void *context),
@@ -644,8 +619,6 @@ int rdma_resolve_ip(struct rdma_addr_cli
req->addr = addr;
req->callback = callback;
req->context = context;
- req->client = client;
- atomic_inc(&client->refcount);
INIT_DELAYED_WORK(&req->work, process_one_req);
req->seq = (u32)atomic_inc_return(&ib_nl_addr_request_seq);
@@ -661,7 +634,6 @@ int rdma_resolve_ip(struct rdma_addr_cli
break;
default:
ret = req->status;
- atomic_dec(&client->refcount);
goto err;
}
return ret;
@@ -722,7 +694,6 @@ void rdma_addr_cancel(struct rdma_dev_ad
found->callback(-ECANCELED, (struct sockaddr *)&found->src_addr,
found->addr, found->context);
- put_client(found->client);
kfree(found);
}
EXPORT_SYMBOL(rdma_addr_cancel);
@@ -761,8 +732,8 @@ int rdma_addr_find_l2_eth_by_grh(const u
dev_addr.net = &init_net;
init_completion(&ctx.comp);
- ret = rdma_resolve_ip(&self, &sgid_addr._sockaddr, &dgid_addr._sockaddr,
- &dev_addr, 1000, resolve_cb, &ctx);
+ ret = rdma_resolve_ip(&sgid_addr._sockaddr, &dgid_addr._sockaddr,
+ &dev_addr, 1000, resolve_cb, &ctx);
if (ret)
return ret;
@@ -806,14 +777,13 @@ int addr_init(void)
return -ENOMEM;
register_netevent_notifier(&nb);
- rdma_addr_register_client(&self);
return 0;
}
void addr_cleanup(void)
{
- rdma_addr_unregister_client(&self);
unregister_netevent_notifier(&nb);
destroy_workqueue(addr_wq);
+ WARN_ON(!list_empty(&req_list));
}
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -156,7 +156,6 @@ static struct ib_client cma_client = {
};
static struct ib_sa_client sa_client;
-static struct rdma_addr_client addr_client;
static LIST_HEAD(dev_list);
static LIST_HEAD(listen_any_list);
static DEFINE_MUTEX(lock);
@@ -2936,7 +2935,7 @@ int rdma_resolve_addr(struct rdma_cm_id
if (dst_addr->sa_family == AF_IB) {
ret = cma_resolve_ib_addr(id_priv);
} else {
- ret = rdma_resolve_ip(&addr_client, cma_src_addr(id_priv),
+ ret = rdma_resolve_ip(cma_src_addr(id_priv),
dst_addr, &id->route.addr.dev_addr,
timeout_ms, addr_handler, id_priv);
}
@@ -4573,7 +4572,6 @@ static int __init cma_init(void)
goto err_wq;
ib_sa_register_client(&sa_client);
- rdma_addr_register_client(&addr_client);
register_netdevice_notifier(&cma_nb);
ret = ib_register_client(&cma_client);
@@ -4587,7 +4585,6 @@ static int __init cma_init(void)
err:
unregister_netdevice_notifier(&cma_nb);
- rdma_addr_unregister_client(&addr_client);
ib_sa_unregister_client(&sa_client);
err_wq:
destroy_workqueue(cma_wq);
@@ -4600,7 +4597,6 @@ static void __exit cma_cleanup(void)
rdma_nl_unregister(RDMA_NL_RDMA_CM);
ib_unregister_client(&cma_client);
unregister_netdevice_notifier(&cma_nb);
- rdma_addr_unregister_client(&addr_client);
ib_sa_unregister_client(&sa_client);
unregister_pernet_subsys(&cma_pernet_operations);
destroy_workqueue(cma_wq);
--- a/include/rdma/ib_addr.h
+++ b/include/rdma/ib_addr.h
@@ -49,22 +49,6 @@
#include <net/ipv6.h>
#include <net/net_namespace.h>
-struct rdma_addr_client {
- atomic_t refcount;
- struct completion comp;
-};
-
-/**
- * rdma_addr_register_client - Register an address client.
- */
-void rdma_addr_register_client(struct rdma_addr_client *client);
-
-/**
- * rdma_addr_unregister_client - Deregister an address client.
- * @client: Client object to deregister.
- */
-void rdma_addr_unregister_client(struct rdma_addr_client *client);
-
/**
* struct rdma_dev_addr - Contains resolved RDMA hardware addresses
* @src_dev_addr: Source MAC address.
@@ -99,7 +83,6 @@ int rdma_translate_ip(const struct socka
/**
* rdma_resolve_ip - Resolve source and destination IP addresses to
* RDMA hardware addresses.
- * @client: Address client associated with request.
* @src_addr: An optional source address to use in the resolution. If a
* source address is not provided, a usable address will be returned via
* the callback.
@@ -112,8 +95,7 @@ int rdma_translate_ip(const struct socka
* or been canceled. A status of 0 indicates success.
* @context: User-specified context associated with the call.
*/
-int rdma_resolve_ip(struct rdma_addr_client *client,
- struct sockaddr *src_addr, struct sockaddr *dst_addr,
+int rdma_resolve_ip(struct sockaddr *src_addr, struct sockaddr *dst_addr,
struct rdma_dev_addr *addr, int timeout_ms,
void (*callback)(int status, struct sockaddr *src_addr,
struct rdma_dev_addr *addr, void *context),