From: Long Li <longli@xxxxxxxxxxxxx>
All the data recevied via SMBD are placed in the reassembly queue. When upper layer reads data, it looks into reassembly queue. The SMBD layer is responsibe for passing a complete SMB packet to upper layer.
Signed-off-by: Long Li <longli@xxxxxxxxxxxxx>
---
fs/cifs/cifsrdma.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/cifs/cifsrdma.h | 11 +++++++++++
2 files changed, 63 insertions(+)
diff --git a/fs/cifs/cifsrdma.c b/fs/cifs/cifsrdma.c
index 97cde3f..1d3fd26 100644
--- a/fs/cifs/cifsrdma.c
+++ b/fs/cifs/cifsrdma.c
@@ -62,6 +62,12 @@ static void put_receive_buffer(
static int allocate_receive_buffers(struct cifs_rdma_info *info, int num_buf);
static void destroy_receive_buffers(struct cifs_rdma_info *info);
+static void enqueue_reassembly(
+ struct cifs_rdma_info *info,
+ struct cifs_rdma_response *response, int data_length);
+static struct cifs_rdma_response* _get_first_reassembly(
+ struct cifs_rdma_info *info);
+
static int cifs_rdma_post_recv(
struct cifs_rdma_info *info,
struct cifs_rdma_response *response);
@@ -377,6 +383,12 @@ static void recv_done(struct ib_cq *cq, struct ib_wc *wc)
else
info->full_packet_received = true;
+ enqueue_reassembly(
+ info,
+ response,
+ le32_to_cpu(data_transfer->data_length));
+
+ wake_up(&info->wait_reassembly_queue);
goto queue_done;
}
@@ -1041,6 +1053,41 @@ static int cifs_rdma_negotiate(struct cifs_rdma_info *info)
}
/*
+ * Implement Connection.FragmentReassemblyBuffer defined in [MS-SMBD] 3.1.1.1
+ * This is a queue for reassembling upper layer payload and present to upper
+ * layer. All the inncoming payload go to the reassembly queue, regardless of
+ * reassembly is rquired. The uuper layer code reads from the queue for any
+ * incoming payloads.
+ */
+static void enqueue_reassembly(
+ struct cifs_rdma_info *info,
+ struct cifs_rdma_response *response,
+ int data_length)
+{
+ unsigned long flags;
+ spin_lock_irqsave(&info->reassembly_queue_lock, flags);
+ list_add_tail(&response->list, &info->reassembly_queue);
+ atomic_add(data_length, &info->reassembly_data_length);
+ log_reassembly_queue("info->reassembly_data_length=%d\n",
+ atomic_read(&info->reassembly_data_length));
+ info->count_reassembly_queue++;
+ info->count_enqueue_reassembly_queue++;
+ spin_unlock_irqrestore(&info->reassembly_queue_lock, flags);
+}
+
+static struct cifs_rdma_response * _get_first_reassembly(struct cifs_rdma_info *info)
+{
+ struct cifs_rdma_response *ret = NULL;
+
+ if (!list_empty(&info->reassembly_queue)) {
+ ret = list_first_entry(
+ &info->reassembly_queue,
+ struct cifs_rdma_response, list);
+ }
+ return ret;
+}
+
+/*
* Receive buffer operations.
* For each remote send, we need to post a receive. The receive buffers are
* pre-allocated in advance.
@@ -1084,6 +1131,10 @@ static int allocate_receive_buffers(struct cifs_rdma_info *info, int num_buf)
int i;
struct cifs_rdma_response *response;
+ INIT_LIST_HEAD(&info->reassembly_queue);
+ spin_lock_init(&info->reassembly_queue_lock);
+ atomic_set(&info->reassembly_data_length, 0);
+
INIT_LIST_HEAD(&info->receive_queue);
spin_lock_init(&info->receive_queue_lock);
@@ -1241,6 +1292,7 @@ struct cifs_rdma_info* cifs_create_rdma_session(
allocate_receive_buffers(info, info->receive_credit_max);
init_waitqueue_head(&info->wait_send_queue);
+ init_waitqueue_head(&info->wait_reassembly_queue);
init_waitqueue_head(&info->wait_send_pending);
atomic_set(&info->send_pending, 0);
diff --git a/fs/cifs/cifsrdma.h b/fs/cifs/cifsrdma.h
index 90746a4..b26e3b7 100644
--- a/fs/cifs/cifsrdma.h
+++ b/fs/cifs/cifsrdma.h
@@ -82,6 +82,14 @@ struct cifs_rdma_info {
struct list_head receive_queue;
spinlock_t receive_queue_lock;
+ /* reassembly queue */
+ struct list_head reassembly_queue;
+ spinlock_t reassembly_queue_lock;
+ wait_queue_head_t wait_reassembly_queue;
+
+ // total data length of reassembly queue
+ atomic_t reassembly_data_length;
+
wait_queue_head_t wait_send_queue;
// request pool for RDMA send
@@ -98,6 +106,9 @@ struct cifs_rdma_info {
unsigned int count_receive_buffer;
unsigned int count_get_receive_buffer;
unsigned int count_put_receive_buffer;
+ unsigned int count_reassembly_queue;
+ unsigned int count_enqueue_reassembly_queue;
+ unsigned int count_dequeue_reassembly_queue;
unsigned int count_send_empty;
};
--
2.7.4
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