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xprtrdma: Update comments in rpcrdma_marshal_req() 

Update documenting comments to reflect code changes over the past
year.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: Steve Wise <swise@opengridcomputing.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever 2016-05-02 14:41:22 -04:00 committed by Anna Schumaker
parent cce6deeb56
commit 88b18a1203
1 changed files with 4 additions and 14 deletions
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18
net/sunrpc/xprtrdma/rpc_rdma.c
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@ -494,13 +494,10 @@ static void rpcrdma_inline_pullup(struct rpc_rqst *rqst)
* Marshal a request: the primary job of this routine is to choose
* the transfer modes. See comments below.
*
* Uses multiple RDMA IOVs for a request:
* [0] -- RPC RDMA header, which uses memory from the *start* of the
* preregistered buffer that already holds the RPC data in
* its middle.
* [1] -- the RPC header/data, marshaled by RPC and the NFS protocol.
* [2] -- optional padding.
* [3] -- if padded, header only in [1] and data here.
* Prepares up to two IOVs per Call message:
*
* [0] -- RPC RDMA header
* [1] -- the RPC header/data
*
* Returns zero on success, otherwise a negative errno.
*/
@ -624,13 +621,6 @@ rpcrdma_marshal_req(struct rpc_rqst *rqst)
__func__, transfertypes[wtype], hdrlen, rpclen,
headerp, base, rdmab_lkey(req->rl_rdmabuf));
/*
* initialize send_iov's - normally only two: rdma chunk header and
* single preregistered RPC header buffer, but if padding is present,
* then use a preregistered (and zeroed) pad buffer between the RPC
* header and any write data. In all non-rdma cases, any following
* data has been copied into the RPC header buffer.
*/
req->rl_send_iov[0].addr = rdmab_addr(req->rl_rdmabuf);
req->rl_send_iov[0].length = hdrlen;
req->rl_send_iov[0].lkey = rdmab_lkey(req->rl_rdmabuf);