SUNRPC: Simplify TCP receive code by switching to using iterators

Most of this code should also be reusable with other socket types.
Signed-off-by: NTrond Myklebust <trond.myklebust@hammerspace.com>

include/linux/sunrpc/xprtsock.h

@@ -31,15 +31,16 @@ struct sock_xprt {
 	 * State of TCP reply receive
 	 */
 	struct {
-		__be32		fraghdr,
+		struct {
+			__be32	fraghdr,
 				xid,
 				calldir;
+		} __attribute__((packed));
 
 		u32		offset,
 				len;
 
-		unsigned long	copied,
-				flags;
+		unsigned long	copied;
 	} recv;
 
 	/*
@@ -76,21 +77,9 @@ struct sock_xprt {
 	void			(*old_error_report)(struct sock *);
 };
 
-/*
- * TCP receive state flags
- */
-#define TCP_RCV_LAST_FRAG	(1UL << 0)
-#define TCP_RCV_COPY_FRAGHDR	(1UL << 1)
-#define TCP_RCV_COPY_XID	(1UL << 2)
-#define TCP_RCV_COPY_DATA	(1UL << 3)
-#define TCP_RCV_READ_CALLDIR	(1UL << 4)
-#define TCP_RCV_COPY_CALLDIR	(1UL << 5)
-
 /*
  * TCP RPC flags
  */
-#define TCP_RPC_REPLY		(1UL << 6)
-
 #define XPRT_SOCK_CONNECTING	1U
 #define XPRT_SOCK_DATA_READY	(2)
 #define XPRT_SOCK_UPD_TIMEOUT	(3)

include/trace/events/sunrpc.h

@@ -497,16 +497,6 @@ TRACE_EVENT(xs_tcp_data_ready,
 			__get_str(port), __entry->err, __entry->total)
 );
 
-#define rpc_show_sock_xprt_flags(flags) \
-	__print_flags(flags, "|", \
-		{ TCP_RCV_LAST_FRAG, "TCP_RCV_LAST_FRAG" }, \
-		{ TCP_RCV_COPY_FRAGHDR, "TCP_RCV_COPY_FRAGHDR" }, \
-		{ TCP_RCV_COPY_XID, "TCP_RCV_COPY_XID" }, \
-		{ TCP_RCV_COPY_DATA, "TCP_RCV_COPY_DATA" }, \
-		{ TCP_RCV_READ_CALLDIR, "TCP_RCV_READ_CALLDIR" }, \
-		{ TCP_RCV_COPY_CALLDIR, "TCP_RCV_COPY_CALLDIR" }, \
-		{ TCP_RPC_REPLY, "TCP_RPC_REPLY" })
-
 TRACE_EVENT(xs_tcp_data_recv,
 	TP_PROTO(struct sock_xprt *xs),
 
@@ -516,7 +506,6 @@ TRACE_EVENT(xs_tcp_data_recv,
 		__string(addr, xs->xprt.address_strings[RPC_DISPLAY_ADDR])
 		__string(port, xs->xprt.address_strings[RPC_DISPLAY_PORT])
 		__field(u32, xid)
-		__field(unsigned long, flags)
 		__field(unsigned long, copied)
 		__field(unsigned int, reclen)
 		__field(unsigned long, offset)
@@ -526,15 +515,13 @@ TRACE_EVENT(xs_tcp_data_recv,
 		__assign_str(addr, xs->xprt.address_strings[RPC_DISPLAY_ADDR]);
 		__assign_str(port, xs->xprt.address_strings[RPC_DISPLAY_PORT]);
 		__entry->xid = be32_to_cpu(xs->recv.xid);
-		__entry->flags = xs->recv.flags;
 		__entry->copied = xs->recv.copied;
 		__entry->reclen = xs->recv.len;
 		__entry->offset = xs->recv.offset;
 	),
 
-	TP_printk("peer=[%s]:%s xid=0x%08x flags=%s copied=%lu reclen=%u offset=%lu",
+	TP_printk("peer=[%s]:%s xid=0x%08x copied=%lu reclen=%u offset=%lu",
 			__get_str(addr), __get_str(port), __entry->xid,
-			rpc_show_sock_xprt_flags(__entry->flags),
 			__entry->copied, __entry->reclen, __entry->offset)
 );