[Qemu-devel] [RFC PATCH v3 2/5] net: port tap onto glib

[Liu Ping Fan]

Signed-off-by: Liu Ping Fan <pingf...@linux.vnet.ibm.com>
---
 net/tap.c |   58 +++++++++++++++++++++++++++++++++++++++++++++++-----------
 1 files changed, 47 insertions(+), 11 deletions(-)

diff --git a/net/tap.c b/net/tap.c
index daab350..e19bb07 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -70,25 +70,48 @@ static int tap_can_send(void *opaque);
 static void tap_send(void *opaque);
 static void tap_writable(void *opaque);
 
-static void tap_update_fd_handler(TAPState *s)
+static bool readable(void *opaque)
 {
-    qemu_set_fd_handler2(s->fd,
-                         s->read_poll && s->enabled ? tap_can_send : NULL,
-                         s->read_poll && s->enabled ? tap_send     : NULL,
-                         s->write_poll && s->enabled ? tap_writable : NULL,
-                         s);
+    TAPState *s = opaque;
+
+    if (s->enabled && s->read_poll &&
+        tap_can_send(s)) {
+        return true;
+    }
+    return false;
+}
+
+static bool writable(void *opaque)
+{
+    TAPState *s = opaque;
+
+    if (s->enabled && s->write_poll) {
+        return true;
+    }
+    return false;
+}
+
+static gboolean tap_handler(gpointer data)
+{
+    NetClientSource *nsrc = data;
+
+    if (nsrc->gfd.revents & G_IO_IN) {
+        tap_send(nsrc->opaque);
+    }
+    if (nsrc->gfd.revents & G_IO_OUT) {
+        tap_writable(nsrc->opaque);
+    }
+    return true;
 }
 
 static void tap_read_poll(TAPState *s, bool enable)
 {
     s->read_poll = enable;
-    tap_update_fd_handler(s);
 }
 
 static void tap_write_poll(TAPState *s, bool enable)
 {
     s->write_poll = enable;
-    tap_update_fd_handler(s);
 }
 
 static void tap_writable(void *opaque)
@@ -298,6 +321,7 @@ static void tap_cleanup(NetClientState *nc)
 static void tap_poll(NetClientState *nc, bool enable)
 {
     TAPState *s = DO_UPCAST(TAPState, nc, nc);
+    /* fixme, when tap backend on another thread, the disable should be sync */
     tap_read_poll(s, enable);
     tap_write_poll(s, enable);
 }
@@ -309,6 +333,11 @@ int tap_get_fd(NetClientState *nc)
     return s->fd;
 }
 
+static void tap_bind_ctx(NetClientState *nc, GMainContext *ctx)
+{
+    g_source_attach(&nc->nsrc->source, ctx);
+}
+
 /* fd support */
 
 static NetClientInfo net_tap_info = {
@@ -319,6 +348,7 @@ static NetClientInfo net_tap_info = {
     .receive_iov = tap_receive_iov,
     .poll = tap_poll,
     .cleanup = tap_cleanup,
+    .bind_ctx = tap_bind_ctx,
 };
 
 static TAPState *net_tap_fd_init(NetClientState *peer,
@@ -596,13 +626,19 @@ static int net_init_tap_one(const NetdevTapOptions *tap, 
NetClientState *peer,
                             int vnet_hdr, int fd)
 {
     TAPState *s;
+    NetClientSource *nsrc;
 
     s = net_tap_fd_init(peer, model, name, fd, vnet_hdr);
     if (!s) {
         close(fd);
         return -1;
     }
-
+    nsrc = net_source_new(s->fd, tap_handler, s);
+    nsrc->gfd.events = G_IO_IN|G_IO_OUT;
+    nsrc->readable = readable;
+    nsrc->writable = writable;
+    s->nc.nsrc = nsrc;
+    s->nc.info->bind_ctx(&s->nc, NULL);
     if (tap_set_sndbuf(s->fd, tap) < 0) {
         return -1;
     }
@@ -843,8 +879,8 @@ int tap_enable(NetClientState *nc)
     } else {
         ret = tap_fd_enable(s->fd);
         if (ret == 0) {
+            /*fixme, will be sync to ensure handler not be called */
             s->enabled = true;
-            tap_update_fd_handler(s);
         }
         return ret;
     }
@@ -861,8 +897,8 @@ int tap_disable(NetClientState *nc)
         ret = tap_fd_disable(s->fd);
         if (ret == 0) {
             qemu_purge_queued_packets(nc);
+            /*fixme, will be sync to ensure handler not be called */
             s->enabled = false;
-            tap_update_fd_handler(s);
         }
         return ret;
     }
-- 
1.7.4.4