[rdma-next v2 01/33] RDMA/core: Add wait/retry version of ibnl_unicast

Leon Romanovsky
2017-08-10T11:07:55Z

From: "Ismail, Mustafa" <mustafa.ismail-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>

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-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Signed-off-by: Chien Tin Tung <chien.tin.tung-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Signed-off-by: Leon Romanovsky <leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
drivers/infiniband/core/iwpm_msg.c | 6 +++---
drivers/infiniband/core/netlink.c | 12 +++++++++++-
include/rdma/rdma_netlink.h | 10 ++++++++++
3 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/drivers/infiniband/core/iwpm_msg.c b/drivers/infiniband/core/iwpm_msg.c
index a0e7c16d8bd8..add99b92afdf 100644
--- a/drivers/infiniband/core/iwpm_msg.c
+++ b/drivers/infiniband/core/iwpm_msg.c
@@ -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;
diff --git a/drivers/infiniband/core/netlink.c b/drivers/infiniband/core/netlink.c
index 94931c474d41..0fc50e15ae22 100644
--- a/drivers/infiniband/core/netlink.c
+++ b/drivers/infiniband/core/netlink.c
@@ -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)
{
diff --git a/include/rdma/rdma_netlink.h b/include/rdma/rdma_netlink.h
index 348c102cb5f6..5b1466770917 100644
--- a/include/rdma/rdma_netlink.h
+++ b/include/rdma/rdma_netlink.h
@@ -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