[Qemu-devel] [RFC][PATCH v3 05/21] virtproxy, add vp_channel_send_all

[Michael Roth <mdroth@linux.vnet.ibm.com>]

This handles sending of data to channel fd (qemu-vp in guest) or the
device associated with the virtproxy chardev for the host depending on
the context. vp_chr_read() wraps qemu_chr_read(), it'll be defined later
in virtproxy-builtin.c, and noop'd in the guest agent via qemu-vp.c.

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
 virtproxy.c |   31 +++++++++++++++++++++++++++++++
 virtproxy.h |    1 +
 2 files changed, 32 insertions(+), 0 deletions(-)

diff --git a/virtproxy.c b/virtproxy.c
index 2cfd905..edca62e 100644
--- a/virtproxy.c
+++ b/virtproxy.c
@@ -152,6 +152,37 @@ static QemuOptsList vp_socket_opts = {
     },
 };
 
+static int vp_channel_send_all(VPDriver *drv, uint8_t *buf, int count)
+{
+    int ret;
+    CharDriverState *chr = drv->chr;
+
+    if (drv->chr != NULL) {
+        /* send data to guest via channel device's read handler */
+        vp_chr_read(chr, buf, count);
+        /* TODO: we assume here the full buffer was written to device
+         * due to the dev write handler being a void function.
+         * can we confirm? Do we need to?
+         */
+        ret = count;
+    } else if (drv->channel_fd != -1) {
+        /* send data to host via channel fd */
+        ret = vp_send_all(drv->channel_fd, buf, count);
+        if (ret == -1) {
+            LOG("error sending data");
+            goto out_bad;
+        }
+    } else {
+        LOG("driver in unknown state");
+        goto out_bad;
+    }
+
+    return ret;
+out_bad:
+    LOG("unable to send to channel");
+    return -1;
+}
+
 /* get VPConn by fd, "client" denotes whether to look for client or server */
 static VPConn *get_conn(const VPDriver *drv, int fd, bool client)
 {
diff --git a/virtproxy.h b/virtproxy.h
index 0203421..1a5e56a 100644
--- a/virtproxy.h
+++ b/virtproxy.h
@@ -30,5 +30,6 @@ int vp_set_fd_handler(int fd,
                         IOHandler *fd_read,
                         IOHandler *fd_write,
                         void *opaque);
+void vp_chr_read(CharDriverState *s, uint8_t *buf, int len);
 
 #endif /* VIRTPROXY_H */
-- 
1.7.0.4