lguest: Tell Guest net not to notify us on every packet xmit

virtio_ring has the ability to suppress notifications.  This prevents
a guest exit for every packet, but we need to set a timer on packet
receipt to re-check if there were any remaining packets.

Here are the times for 1G TCP Guest->Host with different timeout
settings (it matters because the TCP window doesn't grow big enough to
fill the entire buffer):

Timeout value	Seconds		Xmit/Recv/Timeout
None (before)	25.3784		xmit 7750233 recv 1
2500 usec	62.5119		xmit 207020 recv 2 timeout 207020
1000 usec	34.5379		xmit 207003 recv 2 timeout 207003
750 usec	29.2305		xmit 207002 recv 1 timeout 207002
500 usec	19.1887		xmit 561141 recv 1 timeout 559657
250 usec	20.0465		xmit 214128 recv 2 timeout 214110
100 usec	19.2583		xmit 561621 recv 1 timeout 560153

(Note that these values are sensitive to the GSO patches which come
 later, and probably other traffic-related variables, so take with a
 large grain of salt).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

diff --git a/Documentation/lguest/lguest.c b/Documentation/lguest/lguest.c
index 46f4c5b09e9e9c41ccdfeafcb150407aa6016126..018472cee1515cee293267c0c5e00d0c3108d80a 100644 (file)
--- a/Documentation/lguest/lguest.c
+++ b/Documentation/lguest/lguest.c
@@ -36,6 +36,7 @@
 #include <sched.h>
 #include <limits.h>
 #include <stddef.h>
+#include <signal.h>
 #include "linux/lguest_launcher.h"
 #include "linux/virtio_config.h"
 #include "linux/virtio_net.h"
@@ -81,6 +82,8 @@ static int waker_fd;
 static void *guest_base;
 /* The maximum guest physical address allowed, and maximum possible. */
 static unsigned long guest_limit, guest_max;
+/* The pipe for signal hander to write to. */
+static int timeoutpipe[2];
 
 /* a per-cpu variable indicating whose vcpu is currently running */
 static unsigned int __thread cpu_id;
@@ -156,11 +159,14 @@ struct virtqueue
        /* Last available index we saw. */
        u16 last_avail_idx;
 
-       /* The routine to call when the Guest pings us. */
-       void (*handle_output)(int fd, struct virtqueue *me);
+       /* The routine to call when the Guest pings us, or timeout. */
+       void (*handle_output)(int fd, struct virtqueue *me, bool timeout);
 
        /* Outstanding buffers */
        unsigned int inflight;
+
+       /* Is this blocked awaiting a timer? */
+       bool blocked;
 };
 
 /* Remember the arguments to the program so we can "reboot" */
@@ -874,7 +880,7 @@ static bool handle_console_input(int fd, struct device *dev)
 
 /* Handling output for console is simple: we just get all the output buffers
  * and write them to stdout. */
-static void handle_console_output(int fd, struct virtqueue *vq)
+static void handle_console_output(int fd, struct virtqueue *vq, bool timeout)
 {
        unsigned int head, out, in;
        int len;
@@ -889,6 +895,21 @@ static void handle_console_output(int fd, struct virtqueue *vq)
        }
 }
 
+static void block_vq(struct virtqueue *vq)
+{
+       struct itimerval itm;
+
+       vq->vring.used->flags |= VRING_USED_F_NO_NOTIFY;
+       vq->blocked = true;
+
+       itm.it_interval.tv_sec = 0;
+       itm.it_interval.tv_usec = 0;
+       itm.it_value.tv_sec = 0;
+       itm.it_value.tv_usec = 500;
+
+       setitimer(ITIMER_REAL, &itm, NULL);
+}
+
 /*
  * The Network
  *
@@ -896,9 +917,9 @@ static void handle_console_output(int fd, struct virtqueue *vq)
  * and write them (ignoring the first element) to this device's file descriptor
  * (/dev/net/tun).
  */
-static void handle_net_output(int fd, struct virtqueue *vq)
+static void handle_net_output(int fd, struct virtqueue *vq, bool timeout)
 {
-       unsigned int head, out, in;
+       unsigned int head, out, in, num = 0;
        int len;
        struct iovec iov[vq->vring.num];
 
@@ -912,7 +933,12 @@ static void handle_net_output(int fd, struct virtqueue *vq)
                (void)convert(&iov[0], struct virtio_net_hdr);
                len = writev(vq->dev->fd, iov+1, out-1);
                add_used_and_trigger(fd, vq, head, len);
+               num++;
        }
+
+       /* Block further kicks and set up a timer if we saw anything. */
+       if (!timeout && num)
+               block_vq(vq);
 }
 
 /* This is where we handle a packet coming in from the tun device to our
@@ -967,18 +993,18 @@ static bool handle_tun_input(int fd, struct device *dev)
 /*L:215 This is the callback attached to the network and console input
  * virtqueues: it ensures we try again, in case we stopped console or net
  * delivery because Guest didn't have any buffers. */
-static void enable_fd(int fd, struct virtqueue *vq)
+static void enable_fd(int fd, struct virtqueue *vq, bool timeout)
 {
        add_device_fd(vq->dev->fd);
        /* Tell waker to listen to it again */
        write(waker_fd, &vq->dev->fd, sizeof(vq->dev->fd));
 }
 
-static void net_enable_fd(int fd, struct virtqueue *vq)
+static void net_enable_fd(int fd, struct virtqueue *vq, bool timeout)
 {
        /* We don't need to know again when Guest refills receive buffer. */
        vq->vring.used->flags |= VRING_USED_F_NO_NOTIFY;
-       enable_fd(fd, vq);
+       enable_fd(fd, vq, timeout);
 }
 
 /* When the Guest tells us they updated the status field, we handle it. */
@@ -1047,7 +1073,7 @@ static void handle_output(int fd, unsigned long addr)
                        if (strcmp(vq->dev->name, "console") != 0)
                                verbose("Output to %s\n", vq->dev->name);
                        if (vq->handle_output)
-                               vq->handle_output(fd, vq);
+                               vq->handle_output(fd, vq, false);
                        return;
                }
        }
@@ -1061,6 +1087,29 @@ static void handle_output(int fd, unsigned long addr)
              strnlen(from_guest_phys(addr), guest_limit - addr));
 }
 
+static void handle_timeout(int fd)
+{
+       char buf[32];
+       struct device *i;
+       struct virtqueue *vq;
+
+       /* Clear the pipe */
+       read(timeoutpipe[0], buf, sizeof(buf));
+
+       /* Check each device and virtqueue: flush blocked ones. */
+       for (i = devices.dev; i; i = i->next) {
+               for (vq = i->vq; vq; vq = vq->next) {
+                       if (!vq->blocked)
+                               continue;
+
+                       vq->vring.used->flags &= ~VRING_USED_F_NO_NOTIFY;
+                       vq->blocked = false;
+                       if (vq->handle_output)
+                               vq->handle_output(fd, vq, true);
+               }
+       }
+}
+
 /* This is called when the Waker wakes us up: check for incoming file
  * descriptors. */
 static void handle_input(int fd)
@@ -1071,9 +1120,14 @@ static void handle_input(int fd)
        for (;;) {
                struct device *i;
                fd_set fds = devices.infds;
+               int num;
 
+               num = select(devices.max_infd+1, &fds, NULL, NULL, &poll);
+               /* Could get interrupted */
+               if (num < 0)
+                       continue;
                /* If nothing is ready, we're done. */
-               if (select(devices.max_infd+1, &fds, NULL, NULL, &poll) == 0)
+               if (num == 0)
                        break;
 
                /* Otherwise, call the device(s) which have readable file
@@ -1097,6 +1151,10 @@ static void handle_input(int fd)
                                write(waker_fd, &dev_fd, sizeof(dev_fd));
                        }
                }
+
+               /* Is this the timeout fd? */
+               if (FD_ISSET(timeoutpipe[0], &fds))
+                       handle_timeout(fd);
        }
 }
 
@@ -1145,7 +1203,7 @@ static struct lguest_device_desc *new_dev_desc(u16 type)
 /* Each device descriptor is followed by the description of its virtqueues.  We
  * specify how many descriptors the virtqueue is to have. */
 static void add_virtqueue(struct device *dev, unsigned int num_descs,
-                         void (*handle_output)(int fd, struct virtqueue *me))
+                         void (*handle_output)(int, struct virtqueue *, bool))
 {
        unsigned int pages;
        struct virtqueue **i, *vq = malloc(sizeof(*vq));
@@ -1161,6 +1219,7 @@ static void add_virtqueue(struct device *dev, unsigned int num_descs,
        vq->last_avail_idx = 0;
        vq->dev = dev;
        vq->inflight = 0;
+       vq->blocked = false;
 
        /* Initialize the configuration. */
        vq->config.num = num_descs;
@@ -1293,6 +1352,24 @@ static void setup_console(void)
 }
 /*:*/
 
+static void timeout_alarm(int sig)
+{
+       write(timeoutpipe[1], "", 1);
+}
+
+static void setup_timeout(void)
+{
+       if (pipe(timeoutpipe) != 0)
+               err(1, "Creating timeout pipe");
+
+       if (fcntl(timeoutpipe[1], F_SETFL,
+                 fcntl(timeoutpipe[1], F_GETFL) | O_NONBLOCK) != 0)
+               err(1, "Making timeout pipe nonblocking");
+
+       add_device_fd(timeoutpipe[0]);
+       signal(SIGALRM, timeout_alarm);
+}
+
 /*M:010 Inter-guest networking is an interesting area.  Simplest is to have a
  * --sharenet=<name> option which opens or creates a named pipe.  This can be
  * used to send packets to another guest in a 1:1 manner.
@@ -1653,7 +1730,7 @@ static bool handle_io_finish(int fd, struct device *dev)
 }
 
 /* When the Guest submits some I/O, we just need to wake the I/O thread. */
-static void handle_virtblk_output(int fd, struct virtqueue *vq)
+static void handle_virtblk_output(int fd, struct virtqueue *vq, bool timeout)
 {
        struct vblk_info *vblk = vq->dev->priv;
        char c = 0;
@@ -1824,7 +1901,7 @@ static void __attribute__((noreturn)) run_guest(int lguest_fd)
                /* ERESTART means that we need to reboot the guest */
                } else if (errno == ERESTART) {
                        restart_guest();
-               /* EAGAIN means the Waker wanted us to look at some input.
+               /* EAGAIN means a signal (timeout).
                 * Anything else means a bug or incompatible change. */
                } else if (errno != EAGAIN)
                        err(1, "Running guest failed");
@@ -1948,6 +2025,9 @@ int main(int argc, char *argv[])
        /* We always have a console device */
        setup_console();
 
+       /* We can timeout waiting for Guest network transmit. */
+       setup_timeout();
+
        /* Now we load the kernel */
        start = load_kernel(open_or_die(argv[optind+1], O_RDONLY));