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xprtrdma: Clean up rpcrdma_marshal_req() synopsis

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Clean up: The caller already has rpcrdma_xprt, so pass that directly
instead. And provide a documenting comment for this critical
function.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever 2017-08-10 12:47:12 -04:00 committed by Anna Schumaker
parent c1bcb68e39
commit 09e60641fc
3 changed files with 19 additions and 10 deletions
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25
net/sunrpc/xprtrdma/rpc_rdma.c
View File

@ -651,18 +651,27 @@ rpcrdma_unmap_sges(struct rpcrdma_ia *ia, struct rpcrdma_req *req)
req->rl_mapped_sges = 0;
}
/*
* Marshal a request: the primary job of this routine is to choose
* the transfer modes. See comments below.
/**
* rpcrdma_marshal_req - Marshal and send one RPC request
* @r_xprt: controlling transport
* @rqst: RPC request to be marshaled
*
* Returns zero on success, otherwise a negative errno.
* For the RPC in "rqst", this function:
* - Chooses the transfer mode (eg., RDMA_MSG or RDMA_NOMSG)
* - Registers Read, Write, and Reply chunks
* - Constructs the transport header
* - Posts a Send WR to send the transport header and request
*
* Returns:
* %0 if the RPC was sent successfully,
* %-ENOTCONN if the connection was lost,
* %-EAGAIN if not enough pages are available for on-demand reply buffer,
* %-ENOBUFS if no MRs are available to register chunks,
* %-EIO if a permanent problem occurred while marshaling.
*/
int
rpcrdma_marshal_req(struct rpc_rqst *rqst)
rpcrdma_marshal_req(struct rpcrdma_xprt *r_xprt, struct rpc_rqst *rqst)
{
struct rpc_xprt *xprt = rqst->rq_xprt;
struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
enum rpcrdma_chunktype rtype, wtype;
struct rpcrdma_msg *headerp;

2
net/sunrpc/xprtrdma/transport.c
View File

@ -730,7 +730,7 @@ xprt_rdma_send_request(struct rpc_task *task)
if (unlikely(!list_empty(&req->rl_registered)))
r_xprt->rx_ia.ri_ops->ro_unmap_safe(r_xprt, req, false);
rc = rpcrdma_marshal_req(rqst);
rc = rpcrdma_marshal_req(r_xprt, rqst);
if (rc < 0)
goto failed_marshal;

2
net/sunrpc/xprtrdma/xprt_rdma.h
View File

@ -637,7 +637,7 @@ enum rpcrdma_chunktype {
bool rpcrdma_prepare_send_sges(struct rpcrdma_ia *, struct rpcrdma_req *,
u32, struct xdr_buf *, enum rpcrdma_chunktype);
void rpcrdma_unmap_sges(struct rpcrdma_ia *, struct rpcrdma_req *);
int rpcrdma_marshal_req(struct rpc_rqst *);
int rpcrdma_marshal_req(struct rpcrdma_xprt *r_xprt, struct rpc_rqst *rqst);
void rpcrdma_set_max_header_sizes(struct rpcrdma_xprt *);
void rpcrdma_reply_handler(struct work_struct *work);