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Commit f26c32fa authored by Chuck Lever's avatar Chuck Lever Committed by Anna Schumaker
Browse files

xprtrdma: Add documenting comments 



Clean up: fill in or update documenting comments for transport
switch entry points.

For xprt_rdma_allocate:

The first paragraph is no longer true since commit 5a6d1db4
("SUNRPC: Add a transport-specific private field in rpc_rqst").

The second paragraph is no longer true since commit 54cbd6b0
("xprtrdma: Delay DMA mapping Send and Receive buffers").

Signed-off-by: default avatarChuck Lever <chuck.lever@oracle.com>
Signed-off-by: default avatarAnna Schumaker <Anna.Schumaker@Netapp.com>
parent 61c208a5

net/sunrpc/xprtrdma/transport.c

+23 −20
Original line number Diff line number Diff line
@@ -256,6 +256,13 @@ xprt_rdma_connect_worker(struct work_struct *work) 
	}

}



/**

 * xprt_rdma_inject_disconnect - inject a connection fault

 * @xprt: transport context

 *

 * If @xprt is connected, disconnect it to simulate spurious connection

 * loss.

 */

static void

xprt_rdma_inject_disconnect(struct rpc_xprt *xprt)

{
@@ -266,16 +273,12 @@ xprt_rdma_inject_disconnect(struct rpc_xprt *xprt) 
	rdma_disconnect(r_xprt->rx_ia.ri_id);

}



/*

 * xprt_rdma_destroy

/**

 * xprt_rdma_destroy - Full tear down of transport

 * @xprt: doomed transport context

 *

 * Destroy the xprt.

 * Free all memory associated with the object, including its own.

 * NOTE: none of the *destroy methods free memory for their top-level

 * objects, even though they may have allocated it (they do free

 * private memory). It's up to the caller to handle it. In this

 * case (RDMA transport), all structure memory is inlined with the

 * struct rpcrdma_xprt.

 * Caller guarantees there will be no more calls to us with

 * this @xprt.

 */

static void

xprt_rdma_destroy(struct rpc_xprt *xprt)
@@ -428,11 +431,12 @@ xprt_setup_rdma(struct xprt_create *args) 
}



/**

 * xprt_rdma_close - Close down RDMA connection

 * @xprt: generic transport to be closed

 * xprt_rdma_close - close a transport connection

 * @xprt: transport context

 *

 * Called during transport shutdown reconnect, or device

 * removal. Caller holds the transport's write lock.

 * Called during transport shutdown, reconnect, or device removal.

 * Caller holds @xprt's send lock to prevent activity on this

 * transport while the connection is torn down.

 */

static void

xprt_rdma_close(struct rpc_xprt *xprt)
@@ -511,6 +515,12 @@ xprt_rdma_timer(struct rpc_xprt *xprt, struct rpc_task *task) 
	xprt_force_disconnect(xprt);

}



/**

 * xprt_rdma_connect - try to establish a transport connection

 * @xprt: transport state

 * @task: RPC scheduler context

 *

 */

static void

xprt_rdma_connect(struct rpc_xprt *xprt, struct rpc_task *task)

{
@@ -630,13 +640,6 @@ rpcrdma_get_recvbuf(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req, 
 *        0:	Success; rq_buffer points to RPC buffer to use

 *   ENOMEM:	Out of memory, call again later

 *      EIO:	A permanent error occurred, do not retry

 *

 * The RDMA allocate/free functions need the task structure as a place

 * to hide the struct rpcrdma_req, which is necessary for the actual

 * send/recv sequence.

 *

 * xprt_rdma_allocate provides buffers that are already mapped for

 * DMA, and a local DMA lkey is provided for each.

 */

static int

xprt_rdma_allocate(struct rpc_task *task)