Re: [PATCH v2 2/6] xprtrdma: Simplify rpcrdma_convert_kvec() and frwr_map()

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Reviewed-By: Tom Talpey <tom@xxxxxxxxxx>

On 2/3/2021 11:24 AM, Chuck Lever wrote:
Clean up.

Remove a conditional branch from the SGL set-up loop in frwr_map():
Instead of using either sg_set_page() or sg_set_buf(), initialize
the mr_page field properly when rpcrdma_convert_kvec() converts the
kvec to an SGL entry. frwr_map() can then invoke sg_set_page()
unconditionally.

Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
  net/sunrpc/xprtrdma/frwr_ops.c  |   12 ++++--------
  net/sunrpc/xprtrdma/rpc_rdma.c  |    2 +-
  net/sunrpc/xprtrdma/xprt_rdma.h |    9 +++++----
  3 files changed, 10 insertions(+), 13 deletions(-)

diff --git a/net/sunrpc/xprtrdma/frwr_ops.c b/net/sunrpc/xprtrdma/frwr_ops.c
index baca49fe83af..13a50f77dddb 100644
--- a/net/sunrpc/xprtrdma/frwr_ops.c
+++ b/net/sunrpc/xprtrdma/frwr_ops.c
@@ -306,14 +306,10 @@ struct rpcrdma_mr_seg *frwr_map(struct rpcrdma_xprt *r_xprt,
  	if (nsegs > ep->re_max_fr_depth)
  		nsegs = ep->re_max_fr_depth;
  	for (i = 0; i < nsegs;) {
-		if (seg->mr_page)
-			sg_set_page(&mr->mr_sg[i],
-				    seg->mr_page,
-				    seg->mr_len,
-				    offset_in_page(seg->mr_offset));
-		else
-			sg_set_buf(&mr->mr_sg[i], seg->mr_offset,
-				   seg->mr_len);
+		sg_set_page(&mr->mr_sg[i],
+			    seg->mr_page,
+			    seg->mr_len,
+			    offset_in_page(seg->mr_offset));
++seg;
  		++i;
diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c
index 832765f3ebba..529adb6ad4db 100644
--- a/net/sunrpc/xprtrdma/rpc_rdma.c
+++ b/net/sunrpc/xprtrdma/rpc_rdma.c
@@ -214,7 +214,7 @@ rpcrdma_convert_kvec(struct kvec *vec, struct rpcrdma_mr_seg *seg,
  		     unsigned int *n)
  {
  	if (vec->iov_len) {
-		seg->mr_page = NULL;
+		seg->mr_page = virt_to_page(vec->iov_base);
  		seg->mr_offset = vec->iov_base;
  		seg->mr_len = vec->iov_len;
  		++seg;
diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h
index 94b28657aeeb..02971e183989 100644
--- a/net/sunrpc/xprtrdma/xprt_rdma.h
+++ b/net/sunrpc/xprtrdma/xprt_rdma.h
@@ -283,10 +283,11 @@ enum {
  				  RPCRDMA_MAX_IOV_SEGS,
  };
-struct rpcrdma_mr_seg { /* chunk descriptors */
-	u32		mr_len;		/* length of chunk or segment */
-	struct page	*mr_page;	/* owning page, if any */
-	char		*mr_offset;	/* kva if no page, else offset */
+/* Arguments for DMA mapping and registration */
+struct rpcrdma_mr_seg {
+	u32		mr_len;		/* length of segment */
+	struct page	*mr_page;	/* underlying struct page */
+	char		*mr_offset;	/* IN: page offset, OUT: iova */
  };
/* The Send SGE array is provisioned to send a maximum size






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