SUNRPC: Improve "fragment too large" warning

Including the client IP address that generated the overrun traffic
seems like it would be helpful. The message now reads:

  kernel: svc: nfsd oversized RPC fragment (1064958 octets) from 100.64.0.11:45866

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

Author: chucklever

net/sunrpc/svcsock.c

@@ -1062,9 +1062,10 @@ static ssize_t svc_tcp_read_marker(struct svc_sock *svsk,
 	return svc_sock_reclen(svsk);
 
 err_too_large:
-	net_notice_ratelimited("svc: %s %s RPC fragment too large: %d\n",
-			       __func__, svsk->sk_xprt.xpt_server->sv_name,
-			       svc_sock_reclen(svsk));
+	net_notice_ratelimited("svc: %s oversized RPC fragment (%u octets) from %pISpc\n",
+			       svsk->sk_xprt.xpt_server->sv_name,
+			       svc_sock_reclen(svsk),
+			       (struct sockaddr *)&svsk->sk_xprt.xpt_remote);
 	svc_xprt_deferred_close(&svsk->sk_xprt);
 err_short:
 	return -EAGAIN;