SUNRPC: Convert svc_tcp_sendmsg to use bio_vecs directly

Add a helper to convert a whole xdr_buf directly into an array of
bio_vecs, then send this array instead of iterating piecemeal over
the xdr_buf containing the outbound RPC message.

Reviewed-by: David Howells <[email protected]>
Signed-off-by: Chuck Lever <[email protected]>

Author: chucklever

include/linux/sunrpc/xdr.h

@@ -139,6 +139,8 @@ void	xdr_terminate_string(const struct xdr_buf *, const u32);
 size_t	xdr_buf_pagecount(const struct xdr_buf *buf);
 int	xdr_alloc_bvec(struct xdr_buf *buf, gfp_t gfp);
 void	xdr_free_bvec(struct xdr_buf *buf);
+unsigned int xdr_buf_to_bvec(struct bio_vec *bvec, unsigned int bvec_size,
+			     const struct xdr_buf *xdr);
 
 static inline __be32 *xdr_encode_array(__be32 *p, const void *s, unsigned int len)
 {

net/sunrpc/svcsock.c

@@ -36,6 +36,8 @@
 #include <linux/skbuff.h>
 #include <linux/file.h>
 #include <linux/freezer.h>
+#include <linux/bvec.h>
+
 #include <net/sock.h>
 #include <net/checksum.h>
 #include <net/ip.h>
@@ -1194,77 +1196,52 @@ static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
 	return 0;	/* record not complete */
 }
 
-static int svc_tcp_send_kvec(struct socket *sock, const struct kvec *vec,
-			      int flags)
-{
-	struct msghdr msg = { .msg_flags = MSG_SPLICE_PAGES | flags, };
-
-	iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, vec, 1, vec->iov_len);
-	return sock_sendmsg(sock, &msg);
-}
-
 /*
  * MSG_SPLICE_PAGES is used exclusively to reduce the number of
  * copy operations in this path. Therefore the caller must ensure
  * that the pages backing @xdr are unchanging.
  *
- * In addition, the logic assumes that * .bv_len is never larger
- * than PAGE_SIZE.
+ * Note that the send is non-blocking. The caller has incremented
+ * the reference count on each page backing the RPC message, and
+ * the network layer will "put" these pages when transmission is
+ * complete.
+ *
+ * This is safe for our RPC services because the memory backing
+ * the head and tail components is never kmalloc'd. These always
+ * come from pages in the svc_rqst::rq_pages array.
  */
-static int svc_tcp_sendmsg(struct socket *sock, struct xdr_buf *xdr,
+static int svc_tcp_sendmsg(struct svc_sock *svsk, struct svc_rqst *rqstp,
 			   rpc_fraghdr marker, unsigned int *sentp)
 {
-	const struct kvec *head = xdr->head;
-	const struct kvec *tail = xdr->tail;
 	struct kvec rm = {
 		.iov_base	= &marker,
 		.iov_len	= sizeof(marker),
 	};
 	struct msghdr msg = {
-		.msg_flags	= 0,
+		.msg_flags	= MSG_MORE,
 	};
+	unsigned int count;
 	int ret;
 
 	*sentp = 0;
-	ret = xdr_alloc_bvec(xdr, GFP_KERNEL);
-	if (ret < 0)
-		return ret;
 
-	ret = kernel_sendmsg(sock, &msg, &rm, 1, rm.iov_len);
+	ret = kernel_sendmsg(svsk->sk_sock, &msg, &rm, 1, rm.iov_len);
 	if (ret < 0)
 		return ret;
 	*sentp += ret;
 	if (ret != rm.iov_len)
 		return -EAGAIN;
 
-	ret = svc_tcp_send_kvec(sock, head, 0);
-	if (ret < 0)
-		return ret;
-	*sentp += ret;
-	if (ret != head->iov_len)
-		goto out;
-
-	if (xdr_buf_pagecount(xdr)) {
-		xdr->bvec[0].bv_offset = offset_in_page(xdr->page_base);
-		xdr->bvec[0].bv_len -= offset_in_page(xdr->page_base);
-	}
+	count = xdr_buf_to_bvec(rqstp->rq_bvec, ARRAY_SIZE(rqstp->rq_bvec),
+				&rqstp->rq_res);
 
 	msg.msg_flags = MSG_SPLICE_PAGES;
-	iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, xdr->bvec,
-		      xdr_buf_pagecount(xdr), xdr->page_len);
-	ret = sock_sendmsg(sock, &msg);
+	iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, rqstp->rq_bvec,
+		      count, rqstp->rq_res.len);
+	ret = sock_sendmsg(svsk->sk_sock, &msg);
 	if (ret < 0)
 		return ret;
 	*sentp += ret;
-
-	if (tail->iov_len) {
-		ret = svc_tcp_send_kvec(sock, tail, 0);
-		if (ret < 0)
-			return ret;
-		*sentp += ret;
-	}
-
-out:
 	return 0;
 }
 
@@ -1295,8 +1272,7 @@ static int svc_tcp_sendto(struct svc_rqst *rqstp)
 	if (svc_xprt_is_dead(xprt))
 		goto out_notconn;
 	tcp_sock_set_cork(svsk->sk_sk, true);
-	err = svc_tcp_sendmsg(svsk->sk_sock, xdr, marker, &sent);
-	xdr_free_bvec(xdr);
+	err = svc_tcp_sendmsg(svsk, rqstp, marker, &sent);
 	trace_svcsock_tcp_send(xprt, err < 0 ? (long)err : sent);
 	if (err < 0 || sent != (xdr->len + sizeof(marker)))
 		goto out_close;

net/sunrpc/xdr.c

@@ -164,6 +164,56 @@ xdr_free_bvec(struct xdr_buf *buf)
 	buf->bvec = NULL;
 }
 
+/**
+ * xdr_buf_to_bvec - Copy components of an xdr_buf into a bio_vec array
+ * @bvec: bio_vec array to populate
+ * @bvec_size: element count of @bio_vec
+ * @xdr: xdr_buf to be copied
+ *
+ * Returns the number of entries consumed in @bvec.
+ */
+unsigned int xdr_buf_to_bvec(struct bio_vec *bvec, unsigned int bvec_size,
+			     const struct xdr_buf *xdr)
+{
+	const struct kvec *head = xdr->head;
+	const struct kvec *tail = xdr->tail;
+	unsigned int count = 0;
+
+	if (head->iov_len) {
+		bvec_set_virt(bvec++, head->iov_base, head->iov_len);
+		++count;
+	}
+
+	if (xdr->page_len) {
+		unsigned int offset, len, remaining;
+		struct page **pages = xdr->pages;
+
+		offset = offset_in_page(xdr->page_base);
+		remaining = xdr->page_len;
+		while (remaining > 0) {
+			len = min_t(unsigned int, remaining,
+				    PAGE_SIZE - offset);
+			bvec_set_page(bvec++, *pages++, len, offset);
+			remaining -= len;
+			offset = 0;
+			if (unlikely(++count > bvec_size))
+				goto bvec_overflow;
+		}
+	}
+
+	if (tail->iov_len) {
+		bvec_set_virt(bvec, tail->iov_base, tail->iov_len);
+		if (unlikely(++count > bvec_size))
+			goto bvec_overflow;
+	}
+
+	return count;
+
+bvec_overflow:
+	pr_warn_once("%s: bio_vec array overflow\n", __func__);
+	return count - 1;
+}
+
 /**
  * xdr_inline_pages - Prepare receive buffer for a large reply
  * @xdr: xdr_buf into which reply will be placed