diff --git a/flow.h b/flow.h
index 4f12831..c2a5190 100644
--- a/flow.h
+++ b/flow.h
@@ -45,7 +45,7 @@ struct flow_common {
  * @flow:	Index of flow referenced
  */
 typedef struct flow_sidx {
-	int		side :1;
+	unsigned	side :1;
 	unsigned	flow :FLOW_INDEX_BITS;
 } flow_sidx_t;
 static_assert(sizeof(flow_sidx_t) <= sizeof(uint32_t),
diff --git a/passt.h b/passt.h
index 66a819f..33b493f 100644
--- a/passt.h
+++ b/passt.h
@@ -37,6 +37,7 @@ union epoll_ref;
 
 #include "pif.h"
 #include "packet.h"
+#include "flow.h"
 #include "icmp.h"
 #include "port_fwd.h"
 #include "tcp.h"
@@ -91,6 +92,7 @@ union epoll_ref {
 		int32_t		fd:FD_REF_BITS;
 		union {
 			uint32_t flow;
+			flow_sidx_t flowside;
 			union tcp_listen_epoll_ref tcp_listen;
 			union udp_epoll_ref udp;
 			union icmp_epoll_ref icmp;
diff --git a/tcp.c b/tcp.c
index d9b6b19..7e5f99d 100644
--- a/tcp.c
+++ b/tcp.c
@@ -304,6 +304,10 @@
 #include "tcp_conn.h"
 #include "flow_table.h"
 
+/* Sides of a flow as we use them in "tap" connections */
+#define	SOCKSIDE	0
+#define	TAPSIDE		1
+
 #define TCP_FRAMES_MEM			128
 #define TCP_FRAMES							\
 	(c->mode == MODE_PASST ? TCP_FRAMES_MEM : 1)
@@ -639,7 +643,7 @@ static int tcp_epoll_ctl(const struct ctx *c, struct tcp_tap_conn *conn)
 {
 	int m = conn->in_epoll ? EPOLL_CTL_MOD : EPOLL_CTL_ADD;
 	union epoll_ref ref = { .type = EPOLL_TYPE_TCP, .fd = conn->sock,
-				.flow = FLOW_IDX(conn) };
+				.flowside = FLOW_SIDX(conn, SOCKSIDE) };
 	struct epoll_event ev = { .data.u64 = ref.u64 };
 
 	if (conn->events == CLOSED) {
@@ -2873,14 +2877,15 @@ static void tcp_tap_sock_handler(struct ctx *c, struct tcp_tap_conn *conn,
  */
 void tcp_sock_handler(struct ctx *c, union epoll_ref ref, uint32_t events)
 {
-	union flow *flow = FLOW(ref.flow);
+	union flow *flow = FLOW(ref.flowside.flow);
 
 	switch (flow->f.type) {
 	case FLOW_TCP:
 		tcp_tap_sock_handler(c, &flow->tcp, events);
 		break;
 	case FLOW_TCP_SPLICE:
-		tcp_splice_sock_handler(c, &flow->tcp_splice, ref.fd, events);
+		tcp_splice_sock_handler(c, &flow->tcp_splice, ref.flowside.side,
+					events);
 		break;
 	default:
 		die("Unexpected %s in tcp_sock_handler_compact()",
diff --git a/tcp_splice.c b/tcp_splice.c
index 4ab0813..69ea79d 100644
--- a/tcp_splice.c
+++ b/tcp_splice.c
@@ -128,8 +128,10 @@ static int tcp_splice_epoll_ctl(const struct ctx *c,
 {
 	int m = conn->in_epoll ? EPOLL_CTL_MOD : EPOLL_CTL_ADD;
 	union epoll_ref ref[SIDES] = {
-		{ .type = EPOLL_TYPE_TCP, .fd = conn->s[0], .flow = FLOW_IDX(conn) },
-		{ .type = EPOLL_TYPE_TCP, .fd = conn->s[1], .flow = FLOW_IDX(conn) }
+		{ .type = EPOLL_TYPE_TCP, .fd = conn->s[0],
+		  .flowside = FLOW_SIDX(conn, 0) },
+		{ .type = EPOLL_TYPE_TCP, .fd = conn->s[1],
+		  .flowside = FLOW_SIDX(conn, 1) }
 	};
 	struct epoll_event ev[SIDES] = { { .data.u64 = ref[0].u64 },
 					 { .data.u64 = ref[1].u64 } };
@@ -481,13 +483,13 @@ bool tcp_splice_conn_from_sock(const struct ctx *c,
  * tcp_splice_sock_handler() - Handler for socket mapped to spliced connection
  * @c:		Execution context
  * @conn:	Connection state
- * @s:		Socket fd on which an event has occurred
+ * @side:	Side of the connection on which an event has occurred
  * @events:	epoll events bitmap
  *
  * #syscalls:pasta splice
  */
 void tcp_splice_sock_handler(struct ctx *c, struct tcp_splice_conn *conn,
-			     int s, uint32_t events)
+			     int side, uint32_t events)
 {
 	uint8_t lowat_set_flag, lowat_act_flag;
 	int eof, never_read;
@@ -507,30 +509,15 @@ void tcp_splice_sock_handler(struct ctx *c, struct tcp_splice_conn *conn,
 	}
 
 	if (events & EPOLLOUT) {
-		if (s == conn->s[0]) {
-			conn_event(c, conn, ~OUT_WAIT_0);
-			fromside = 1;
-		} else {
-			conn_event(c, conn, ~OUT_WAIT_1);
-			fromside = 0;
-		}
+		fromside = !side;
+		conn_event(c, conn, side == 0 ? ~OUT_WAIT_0 : ~OUT_WAIT_1);
 	} else {
-		fromside = s == conn->s[0] ? 0 : 1;
+		fromside = side;
 	}
 
-	if (events & EPOLLRDHUP) {
-		if (s == conn->s[0])
-			conn_event(c, conn, FIN_RCVD_0);
-		else
-			conn_event(c, conn, FIN_RCVD_1);
-	}
-
-	if (events & EPOLLHUP) {
-		if (s == conn->s[0])
-			conn_event(c, conn, FIN_SENT_0); /* Fake, but implied */
-		else
-			conn_event(c, conn, FIN_SENT_1);
-	}
+	if (events & EPOLLRDHUP)
+		/* For side 0 this is fake, but implied */
+		conn_event(c, conn, side == 0 ? FIN_RCVD_0 : FIN_RCVD_1);
 
 swap:
 	eof = 0;
diff --git a/tcp_splice.h b/tcp_splice.h
index dc486f1..aa85c7c 100644
--- a/tcp_splice.h
+++ b/tcp_splice.h
@@ -9,7 +9,7 @@
 struct tcp_splice_conn;
 
 void tcp_splice_sock_handler(struct ctx *c, struct tcp_splice_conn *conn,
-			     int s, uint32_t events);
+			     int side, uint32_t events);
 bool tcp_splice_conn_from_sock(const struct ctx *c,
 			       union tcp_listen_epoll_ref ref,
 			       struct tcp_splice_conn *conn, int s,