Currently connected TCP sockets have the same epoll type, whether they're
for a "tap" connection or a spliced connection. This means that
tcp_sock_handler() has to do a secondary check on the type of the
connection to call the right function. We can avoid this by adding a new
epoll type and dispatching directly to the right thing.
Signed-off-by: David Gibson <david(a)gibson.dropbear.id.au>
---
passt.c | 8 ++++++--
passt.h | 2 ++
tcp.c | 36 ++++++++----------------------------
tcp_splice.c | 16 +++++++++-------
tcp_splice.h | 4 ++--
5 files changed, 27 insertions(+), 39 deletions(-)
diff --git a/passt.c b/passt.c
index a37a2f4..71bea8f 100644
--- a/passt.c
+++ b/passt.c
@@ -50,6 +50,7 @@
#include "pasta.h"
#include "arch.h"
#include "log.h"
+#include "tcp_splice.h"
#define EPOLL_EVENTS 8
@@ -61,6 +62,7 @@ char pkt_buf[PKT_BUF_BYTES] __attribute__ ((aligned(PAGE_SIZE)));
char *epoll_type_str[] = {
[EPOLL_TYPE_TCP] = "connected TCP socket",
+ [EPOLL_TYPE_TCP_SPLICE] = "connected spliced TCP socket",
[EPOLL_TYPE_TCP_LISTEN] = "listening TCP socket",
[EPOLL_TYPE_TCP_TIMER] = "TCP timer",
[EPOLL_TYPE_UDP] = "UDP socket",
@@ -373,8 +375,10 @@ loop:
pasta_netns_quit_handler(&c, quit_fd);
break;
case EPOLL_TYPE_TCP:
- if (!c.no_tcp)
- tcp_sock_handler(&c, ref, eventmask);
+ tcp_sock_handler(&c, ref, eventmask);
+ break;
+ case EPOLL_TYPE_TCP_SPLICE:
+ tcp_splice_sock_handler(&c, ref, eventmask);
break;
case EPOLL_TYPE_TCP_LISTEN:
tcp_listen_handler(&c, ref, &now);
diff --git a/passt.h b/passt.h
index f54023a..82b0fcf 100644
--- a/passt.h
+++ b/passt.h
@@ -51,6 +51,8 @@ enum epoll_type {
EPOLL_TYPE_NONE = 0,
/* Connected TCP sockets */
EPOLL_TYPE_TCP,
+ /* Connected TCP sockets (spliced) */
+ EPOLL_TYPE_TCP_SPLICE,
/* Listening TCP sockets */
EPOLL_TYPE_TCP_LISTEN,
/* timerfds used for TCP timers */
diff --git a/tcp.c b/tcp.c
index 9fffafb..e7d11ee 100644
--- a/tcp.c
+++ b/tcp.c
@@ -2804,14 +2804,18 @@ void tcp_timer_handler(struct ctx *c, union epoll_ref ref)
}
/**
- * tcp_tap_sock_handler() - Handle new data from non-spliced socket
+ * tcp_sock_handler() - Handle new data from non-spliced socket
* @c: Execution context
- * @conn: Connection state
+ * @ref: epoll reference
* @events: epoll events bitmap
*/
-static void tcp_tap_sock_handler(struct ctx *c, struct tcp_tap_conn *conn,
- uint32_t events)
+void tcp_sock_handler(struct ctx *c, union epoll_ref ref, uint32_t events)
{
+ struct tcp_tap_conn *conn = CONN(ref.flowside.flow);
+
+ ASSERT(conn->f.type == FLOW_TCP);
+ ASSERT(ref.flowside.side == SOCKSIDE);
+
if (conn->events == CLOSED)
return;
@@ -2858,30 +2862,6 @@ static void tcp_tap_sock_handler(struct ctx *c, struct tcp_tap_conn
*conn,
}
}
-/**
- * tcp_sock_handler() - Handle new data from socket, or timerfd event
- * @c: Execution context
- * @ref: epoll reference
- * @events: epoll events bitmap
- */
-void tcp_sock_handler(struct ctx *c, union epoll_ref ref, uint32_t events)
-{
- 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.flowside.side,
- events);
- break;
- default:
- die("Unexpected %s in tcp_sock_handler_compact()",
- FLOW_TYPE(&flow->f));
- }
-}
-
/**
* tcp_sock_init_af() - Initialise listening socket for a given af and port
* @c: Execution context
diff --git a/tcp_splice.c b/tcp_splice.c
index a7d577a..33bbef1 100644
--- a/tcp_splice.c
+++ b/tcp_splice.c
@@ -127,9 +127,9 @@ static int tcp_splice_epoll_ctl(const struct ctx *c,
{
int m = conn->in_epoll ? EPOLL_CTL_MOD : EPOLL_CTL_ADD;
const union epoll_ref ref[SIDES] = {
- { .type = EPOLL_TYPE_TCP, .fd = conn->s[0],
+ { .type = EPOLL_TYPE_TCP_SPLICE, .fd = conn->s[0],
.flowside = FLOW_SIDX(conn, 0) },
- { .type = EPOLL_TYPE_TCP, .fd = conn->s[1],
+ { .type = EPOLL_TYPE_TCP_SPLICE, .fd = conn->s[1],
.flowside = FLOW_SIDX(conn, 1) }
};
struct epoll_event ev[SIDES] = { { .data.u64 = ref[0].u64 },
@@ -484,18 +484,20 @@ 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
- * @side: Side of the connection on which an event has occurred
+ * @ref: epoll reference
* @events: epoll events bitmap
*
* #syscalls:pasta splice
*/
-void tcp_splice_sock_handler(struct ctx *c, struct tcp_splice_conn *conn,
- int side, uint32_t events)
+void tcp_splice_sock_handler(struct ctx *c, union epoll_ref ref,
+ uint32_t events)
{
+ struct tcp_splice_conn *conn = CONN(ref.flowside.flow);
+ unsigned side = ref.flowside.side, fromside;
uint8_t lowat_set_flag, lowat_act_flag;
int eof, never_read;
- unsigned fromside;
+
+ ASSERT(conn->f.type == FLOW_TCP_SPLICE);
if (conn->events == SPLICE_CLOSED)
return;
diff --git a/tcp_splice.h b/tcp_splice.h
index aa85c7c..18193e4 100644
--- a/tcp_splice.h
+++ b/tcp_splice.h
@@ -8,8 +8,8 @@
struct tcp_splice_conn;
-void tcp_splice_sock_handler(struct ctx *c, struct tcp_splice_conn *conn,
- int side, uint32_t events);
+void tcp_splice_sock_handler(struct ctx *c, union epoll_ref ref,
+ 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,
--
2.43.0