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RDMA/rdma_cm: Delete rdma_addr_client

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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>
This commit is contained in:
Jason Gunthorpe 2018-04-03 07:52:04 +03:00
parent 44e75052bc
commit ee6548d1d9
3 changed files with 6 additions and 58 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
drivers/infiniband/core/addr.c
View File

@ -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_sockaddr_storage *addr)
}
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_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_client *client,
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_client *client,
break;
default:
ret = req->status;
atomic_dec(&client->refcount);
goto err;
}
return ret;
@ -722,7 +694,6 @@ void rdma_addr_cancel(struct rdma_dev_addr *addr)
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 union ib_gid *sgid,
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));
}

6
drivers/infiniband/core/cma.c
View File

@ -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);
@ -2910,7 +2909,7 @@ int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
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);
}
@ -4547,7 +4546,6 @@ 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);
@ -4561,7 +4559,6 @@ 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);
@ -4574,7 +4571,6 @@ 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);

20
include/rdma/ib_addr.h
View File

@ -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 sockaddr *addr,
/**
* 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 sockaddr *addr,
* 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),