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RDMA/core: Add wait/retry version of ibnl_unicast 

Add a wait/retry version of ibnl_unicast, ibnl_unicast_wait,
and modify ibnl_unicast to not wait/retry.  This eliminates
the undesirable wait for future users of ibnl_unicast.

Change Portmapper calls originating from kernel to user-space
to use ibnl_unicast_wait and take advantage of the wait/retry
logic in netlink_unicast.

Signed-off-by: Mustafa Ismail <mustafa.ismail@intel.com>
Signed-off-by: Chien Tin Tung <chien.tin.tung@intel.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
This commit is contained in:
Ismail, Mustafa 2017-06-28 09:02:45 -05:00 committed by Leon Romanovsky
parent 913cc67159
commit 9047811b77
3 changed files with 24 additions and 4 deletions
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6
drivers/infiniband/core/iwpm_msg.c
View File

@ -174,7 +174,7 @@ int iwpm_add_mapping(struct iwpm_sa_data *pm_msg, u8 nl_client)
goto add_mapping_error;
nlmsg_request->req_buffer = pm_msg;
ret = ibnl_unicast(skb, nlh, iwpm_user_pid);
ret = ibnl_unicast_wait(skb, nlh, iwpm_user_pid);
if (ret) {
skb = NULL; /* skb is freed in the netlink send-op handling */
iwpm_user_pid = IWPM_PID_UNDEFINED;
@ -251,7 +251,7 @@ int iwpm_add_and_query_mapping(struct iwpm_sa_data *pm_msg, u8 nl_client)
goto query_mapping_error;
nlmsg_request->req_buffer = pm_msg;
ret = ibnl_unicast(skb, nlh, iwpm_user_pid);
ret = ibnl_unicast_wait(skb, nlh, iwpm_user_pid);
if (ret) {
skb = NULL; /* skb is freed in the netlink send-op handling */
err_str = "Unable to send a nlmsg";
@ -312,7 +312,7 @@ int iwpm_remove_mapping(struct sockaddr_storage *local_addr, u8 nl_client)
if (ret)
goto remove_mapping_error;
ret = ibnl_unicast(skb, nlh, iwpm_user_pid);
ret = ibnl_unicast_wait(skb, nlh, iwpm_user_pid);
if (ret) {
skb = NULL; /* skb is freed in the netlink send-op handling */
iwpm_user_pid = IWPM_PID_UNDEFINED;

12
drivers/infiniband/core/netlink.c
View File

@ -232,11 +232,21 @@ int ibnl_unicast(struct sk_buff *skb, struct nlmsghdr *nlh,
{
int err;
err = netlink_unicast(nls, skb, pid, 0);
err = netlink_unicast(nls, skb, pid, MSG_DONTWAIT);
return (err < 0) ? err : 0;
}
EXPORT_SYMBOL(ibnl_unicast);
int ibnl_unicast_wait(struct sk_buff *skb, struct nlmsghdr *nlh,
__u32 pid)
{
int err;
err = netlink_unicast(nls, skb, pid, 0);
return (err < 0) ? err : 0;
}
EXPORT_SYMBOL(ibnl_unicast_wait);
int ibnl_multicast(struct sk_buff *skb, struct nlmsghdr *nlh,
unsigned int group, gfp_t flags)
{

10
include/rdma/rdma_netlink.h
View File

@ -63,6 +63,16 @@ int ibnl_put_attr(struct sk_buff *skb, struct nlmsghdr *nlh,
int ibnl_unicast(struct sk_buff *skb, struct nlmsghdr *nlh,
__u32 pid);
/**
* Send, with wait/1 retry, the supplied skb to a specific userspace PID.
* @skb: The netlink skb
* @nlh: Header of the netlink message to send
* @pid: Userspace netlink process ID
* Returns 0 on success or a negative error code.
*/
int ibnl_unicast_wait(struct sk_buff *skb, struct nlmsghdr *nlh,
__u32 pid);
/**
* Send the supplied skb to a netlink group.
* @skb: The netlink skb