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Subject[Patch v4 07/22] CIFS: SMBD: Implement function to reconnect to a SMBDirect transport
Date
From: Long Li <longli@microsoft.com>

Add function to implement a reconnect to SMBDirect. This involves tearing down
the current connection and establishing/negotiating a new connection.

Signed-off-by: Long Li <longli@microsoft.com>
---
fs/cifs/smbdirect.c | 36 ++++++++++++++++++++++++++++++++++++
fs/cifs/smbdirect.h | 3 +++
2 files changed, 39 insertions(+)

diff --git a/fs/cifs/smbdirect.c b/fs/cifs/smbdirect.c
index 34f73e2..1f0f33c 100644
--- a/fs/cifs/smbdirect.c
+++ b/fs/cifs/smbdirect.c
@@ -1416,6 +1416,42 @@ static void idle_connection_timer(struct work_struct *work)
info->keep_alive_interval*HZ);
}

+/*
+ * Reconnect this SMBD connection, called from upper layer
+ * return value: 0 on success, or actual error code
+ */
+int smbd_reconnect(struct TCP_Server_Info *server)
+{
+ log_rdma_event(INFO, "reconnecting rdma session\n");
+
+ if (!server->smbd_conn) {
+ log_rdma_event(ERR, "rdma session already destroyed\n");
+ return -EINVAL;
+ }
+
+ /*
+ * This is possible if transport is disconnected and we haven't received
+ * notification from RDMA, but upper layer has detected timeout
+ */
+ if (server->smbd_conn->transport_status == SMBD_CONNECTED) {
+ log_rdma_event(INFO, "disconnecting transport\n");
+ smbd_disconnect_rdma_connection(server->smbd_conn);
+ }
+
+ /* wait until the transport is destroyed */
+ wait_event(server->smbd_conn->wait_destroy,
+ server->smbd_conn->transport_status == SMBD_DESTROYED);
+
+ destroy_workqueue(server->smbd_conn->workqueue);
+ kfree(server->smbd_conn);
+
+ log_rdma_event(INFO, "creating rdma session\n");
+ server->smbd_conn = smbd_get_connection(
+ server, (struct sockaddr *) &server->dstaddr);
+
+ return server->smbd_conn ? 0 : -ENOENT;
+}
+
static void destroy_caches_and_workqueue(struct smbd_connection *info)
{
destroy_receive_buffers(info);
diff --git a/fs/cifs/smbdirect.h b/fs/cifs/smbdirect.h
index 42a9338..9818852 100644
--- a/fs/cifs/smbdirect.h
+++ b/fs/cifs/smbdirect.h
@@ -249,6 +249,9 @@ struct smbd_response {
struct smbd_connection *smbd_get_connection(
struct TCP_Server_Info *server, struct sockaddr *dstaddr);

+/* Reconnect SMBDirect session */
+int smbd_reconnect(struct TCP_Server_Info *server);
+
void profiling_display_histogram(
struct seq_file *m, unsigned long long array[]);
#endif
--
2.7.4
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