[Qemu-devel] [PATCH 5/9] usb-serial: iovec support

[Gerd Hoffmann <kraxel@redhat.com>]

Add full support for iovecs to usb-serial.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/usb-serial.c |   27 ++++++++++++++++-----------
 1 files changed, 16 insertions(+), 11 deletions(-)

diff --git a/hw/usb-serial.c b/hw/usb-serial.c
index 4a00211..1133e8d 100644
--- a/hw/usb-serial.c
+++ b/hw/usb-serial.c
@@ -359,38 +359,42 @@ static int usb_serial_handle_control(USBDevice *dev, USBPacket *p,
 static int usb_serial_handle_data(USBDevice *dev, USBPacket *p)
 {
     USBSerialState *s = (USBSerialState *)dev;
-    int ret = 0;
+    int i, ret = 0;
     uint8_t devep = p->devep;
-    uint8_t *data = p->iov.iov[0].iov_base;
-    int len = p->iov.iov[0].iov_len;
-    int first_len;
+    struct iovec *iov;
+    uint8_t header[2];
+    int first_len, len;
 
-    assert(p->iov.niov == 1); /* temporary */
     switch (p->pid) {
     case USB_TOKEN_OUT:
         if (devep != 2)
             goto fail;
-        qemu_chr_write(s->cs, data, len);
+        for (i = 0; i < p->iov.niov; i++) {
+            iov = p->iov.iov + i;
+            qemu_chr_write(s->cs, iov->iov_base, iov->iov_len);
+        }
         break;
 
     case USB_TOKEN_IN:
         if (devep != 1)
             goto fail;
         first_len = RECV_BUF - s->recv_ptr;
+        len = p->iov.size;
         if (len <= 2) {
             ret = USB_RET_NAK;
             break;
         }
-        *data++ = usb_get_modem_lines(s) | 1;
+        header[0] = usb_get_modem_lines(s) | 1;
         /* We do not have the uart details */
         /* handle serial break */
         if (s->event_trigger && s->event_trigger & FTDI_BI) {
             s->event_trigger &= ~FTDI_BI;
-            *data = FTDI_BI;
+            header[1] = FTDI_BI;
+            usb_packet_copy(p, header, 2);
             ret = 2;
             break;
         } else {
-            *data++ = 0;
+            header[1] = 0;
         }
         len -= 2;
         if (len > s->recv_used)
@@ -401,9 +405,10 @@ static int usb_serial_handle_data(USBDevice *dev, USBPacket *p)
         }
         if (first_len > len)
             first_len = len;
-        memcpy(data, s->recv_buf + s->recv_ptr, first_len);
+        usb_packet_copy(p, header, 2);
+        usb_packet_copy(p, s->recv_buf + s->recv_ptr, first_len);
         if (len > first_len)
-            memcpy(data + first_len, s->recv_buf, len - first_len);
+            usb_packet_copy(p, s->recv_buf, len - first_len);
         s->recv_used -= len;
         s->recv_ptr = (s->recv_ptr + len) % RECV_BUF;
         ret = len + 2;
-- 
1.7.1