svcrdma: Add zero padding if the client doesn't send it

#include <linux/sunrpc/debug.h>

#include <linux/sunrpc/rpc_rdma.h>

#include <linux/spinlock.h>

#include <linux/highmem.h>

#include <asm/unaligned.h>

#include <rdma/ib_verbs.h>

#include <rdma/rdma_cm.h>

	return ret;

}

/*

 * To avoid a separate RDMA READ just for a handful of zero bytes,

 * RFC 5666 section 3.7 allows the client to omit the XDR zero pad

 * in chunk lists.

 */

static void

rdma_fix_xdr_pad(struct xdr_buf *buf)

{

	unsigned int page_len = buf->page_len;

	unsigned int size = (XDR_QUADLEN(page_len) << 2) - page_len;

	unsigned int offset, pg_no;

	char *p;

	if (size == 0)

		return;

	pg_no = page_len >> PAGE_SHIFT;

	offset = page_len & ~PAGE_MASK;

	p = page_address(buf->pages[pg_no]);

	memset(p + offset, 0, size);

	buf->page_len += size;

	buf->buflen += size;

	buf->len += size;

}

static int rdma_read_complete(struct svc_rqst *rqstp,

			      struct svc_rdma_op_ctxt *head)

{

		rqstp->rq_pages[page_no] = head->pages[page_no];

	}

	/* Point rq_arg.pages past header */

	rdma_fix_xdr_pad(&head->arg);

	rqstp->rq_arg.pages = &rqstp->rq_pages[head->hdr_count];

	rqstp->rq_arg.page_len = head->arg.page_len;

	rqstp->rq_arg.page_base = head->arg.page_base;