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net: add tap_read_poll() helper 

Add a helper to enable/disable the read polling on tapfd.

We need this, because we want to start write polling on the tapfd too
and enable/disable both types of polling independently.

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Mark McLoughlin 2009-06-18 18:21:31 +01:00 committed by Anthony Liguori
parent b9adce2c83
commit b664e3673c
1 changed files with 23 additions and 7 deletions
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30
net.c
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@ -1043,10 +1043,29 @@ typedef struct TAPState {
char down_script[1024];
char down_script_arg[128];
uint8_t buf[4096];
unsigned int read_poll : 1;
} TAPState;
static int launch_script(const char *setup_script, const char *ifname, int fd);
static int tap_can_send(void *opaque);
static void tap_send(void *opaque);
static void tap_update_fd_handler(TAPState *s)
{
qemu_set_fd_handler2(s->fd,
s->read_poll ? tap_can_send : NULL,
s->read_poll ? tap_send : NULL,
NULL,
s);
}
static void tap_read_poll(TAPState *s, int enable)
{
s->read_poll = !!enable;
tap_update_fd_handler(s);
}
static ssize_t tap_receive_iov(VLANClientState *vc, const struct iovec *iov,
int iovcnt)
{
@ -1097,13 +1116,10 @@ static ssize_t tap_read_packet(int tapfd, uint8_t *buf, int maxlen)
}
#endif
static void tap_send(void *opaque);
static void tap_send_completed(VLANClientState *vc)
{
TAPState *s = vc->opaque;
qemu_set_fd_handler2(s->fd, tap_can_send, tap_send, NULL, s);
tap_read_poll(s, 1);
}
static void tap_send(void *opaque)
@ -1119,7 +1135,7 @@ static void tap_send(void *opaque)
size = qemu_send_packet_async(s->vc, s->buf, size, tap_send_completed);
if (size == 0) {
qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
tap_read_poll(s, 0);
}
} while (size > 0);
}
@ -1133,7 +1149,7 @@ static void tap_cleanup(VLANClientState *vc)
if (s->down_script[0])
launch_script(s->down_script, s->down_script_arg, s->fd);
qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
tap_read_poll(s, 0);
close(s->fd);
qemu_free(s);
}
@ -1151,7 +1167,7 @@ static TAPState *net_tap_fd_init(VLANState *vlan,
s->fd = fd;
s->vc = qemu_new_vlan_client(vlan, model, name, NULL, tap_receive,
tap_receive_iov, tap_cleanup, s);
qemu_set_fd_handler2(s->fd, tap_can_send, tap_send, NULL, s);
tap_read_poll(s, 1);
snprintf(s->vc->info_str, sizeof(s->vc->info_str), "fd=%d", fd);
return s;
}