> On Aug 15, 2016, at 16:50, Chuck Lever <chuck.lever@xxxxxxxxxx> wrote:
>
> Clean up: there is some XDR initialization logic that is commoon
> to the forward channel and backchannel. Move it to an XDR header
> so it can be shared.
>
> rpc_rqst::rq_buffer points to a buffer containing big-endian data.
> Update its annotation as part of the clean up.
>
> Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
> ---
> include/linux/sunrpc/xdr.h | 10 ++++++++++
> include/linux/sunrpc/xprt.h | 2 +-
> net/sunrpc/backchannel_rqst.c | 8 +-------
> net/sunrpc/clnt.c | 24 ++++++------------------
> net/sunrpc/xprtrdma/backchannel.c | 12 +-----------
> 5 files changed, 19 insertions(+), 37 deletions(-)
>
> diff --git a/include/linux/sunrpc/xdr.h b/include/linux/sunrpc/xdr.h
> index 70c6b92..551569c 100644
> --- a/include/linux/sunrpc/xdr.h
> +++ b/include/linux/sunrpc/xdr.h
> @@ -67,6 +67,16 @@ struct xdr_buf {
> len; /* Length of XDR encoded message */
> };
>
> +static inline void
> +xdr_buf_init(struct xdr_buf *buf, __be32 *start, size_t len)
> +{
> + memset(buf, 0, sizeof(*buf));
Can we please leave this as it was. There is no need to zero out unused fields such as the pages pointer, the tail iov_base, etc.
> +
> + buf->head[0].iov_base = start;
> + buf->head[0].iov_len = len;
> + buf->buflen = len;
> +}
> +
> /*
> * pre-xdr'ed macros.
> */
> diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h
> index a16070d..559dad3 100644
> --- a/include/linux/sunrpc/xprt.h
> +++ b/include/linux/sunrpc/xprt.h
> @@ -83,7 +83,7 @@ struct rpc_rqst {
> void (*rq_release_snd_buf)(struct rpc_rqst *); /* release rq_enc_pages */
> struct list_head rq_list;
>
> - __u32 * rq_buffer; /* XDR encode buffer */
> + __be32 *rq_buffer; /* Call XDR encode buffer */
If changing it, why not make it a void* ? Nothing should ever be touching the contents of this buffer directly.
> size_t rq_callsize,
> rq_rcvsize;
> size_t rq_xmit_bytes_sent; /* total bytes sent */
> diff --git a/net/sunrpc/backchannel_rqst.c b/net/sunrpc/backchannel_rqst.c
> index 229956b..ac701c2 100644
> --- a/net/sunrpc/backchannel_rqst.c
> +++ b/net/sunrpc/backchannel_rqst.c
> @@ -76,13 +76,7 @@ static int xprt_alloc_xdr_buf(struct xdr_buf *buf, gfp_t gfp_flags)
> page = alloc_page(gfp_flags);
> if (page == NULL)
> return -ENOMEM;
> - buf->head[0].iov_base = page_address(page);
> - buf->head[0].iov_len = PAGE_SIZE;
> - buf->tail[0].iov_base = NULL;
> - buf->tail[0].iov_len = 0;
> - buf->page_len = 0;
> - buf->len = 0;
> - buf->buflen = PAGE_SIZE;
> + xdr_buf_init(buf, page_address(page), PAGE_SIZE);
> return 0;
> }
>
> diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
> index 7f79fb7..0e75369 100644
> --- a/net/sunrpc/clnt.c
> +++ b/net/sunrpc/clnt.c
> @@ -1748,18 +1748,6 @@ rpc_task_force_reencode(struct rpc_task *task)
> task->tk_rqstp->rq_bytes_sent = 0;
> }
>
> -static inline void
> -rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len)
> -{
> - buf->head[0].iov_base = start;
> - buf->head[0].iov_len = len;
> - buf->tail[0].iov_len = 0;
> - buf->page_len = 0;
> - buf->flags = 0;
> - buf->len = 0;
> - buf->buflen = len;
> -}
> -
> /*
> * 3. Encode arguments of an RPC call
> */
> @@ -1772,12 +1760,12 @@ rpc_xdr_encode(struct rpc_task *task)
>
> dprint_status(task);
>
> - rpc_xdr_buf_init(&req->rq_snd_buf,
> - req->rq_buffer,
> - req->rq_callsize);
> - rpc_xdr_buf_init(&req->rq_rcv_buf,
> - (char *)req->rq_buffer + req->rq_callsize,
> - req->rq_rcvsize);
> + xdr_buf_init(&req->rq_snd_buf,
> + req->rq_buffer,
> + req->rq_callsize);
> + xdr_buf_init(&req->rq_rcv_buf,
> + (__be32 *)((char *)req->rq_buffer + req->rq_callsize),
> + req->rq_rcvsize);
>
> p = rpc_encode_header(task);
> if (p == NULL) {
> diff --git a/net/sunrpc/xprtrdma/backchannel.c b/net/sunrpc/xprtrdma/backchannel.c
> index 5f60ab2..d3cfaf2 100644
> --- a/net/sunrpc/xprtrdma/backchannel.c
> +++ b/net/sunrpc/xprtrdma/backchannel.c
> @@ -38,7 +38,6 @@ static int rpcrdma_bc_setup_rqst(struct rpcrdma_xprt *r_xprt,
> struct rpcrdma_ia *ia = &r_xprt->rx_ia;
> struct rpcrdma_regbuf *rb;
> struct rpcrdma_req *req;
> - struct xdr_buf *buf;
> size_t size;
>
> req = rpcrdma_create_req(r_xprt);
> @@ -60,16 +59,7 @@ static int rpcrdma_bc_setup_rqst(struct rpcrdma_xprt *r_xprt,
> req->rl_sendbuf = rb;
> /* so that rpcr_to_rdmar works when receiving a request */
> rqst->rq_buffer = (void *)req->rl_sendbuf->rg_base;
> -
> - buf = &rqst->rq_snd_buf;
> - buf->head[0].iov_base = rqst->rq_buffer;
> - buf->head[0].iov_len = 0;
> - buf->tail[0].iov_base = NULL;
> - buf->tail[0].iov_len = 0;
> - buf->page_len = 0;
> - buf->len = 0;
> - buf->buflen = size;
> -
> + xdr_buf_init(&rqst->rq_snd_buf, rqst->rq_buffer, size);
> return 0;
>
> out_fail:
>
> --
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