[PULL 19/24] usbnet: Report link-up via interrupt endpoint in CDC-ECM mode

[Gerd Hoffmann <kraxel@redhat.com>]

From: Michael Brown <mcb30@ipxe.org>

Signed-off-by: Michael Brown <mcb30@ipxe.org>
Message-Id: <20220906183053.3625472-5-mcb30@ipxe.org>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/usb/dev-network.c | 27 +++++++++++++++++++++------
 1 file changed, 21 insertions(+), 6 deletions(-)

diff --git a/hw/usb/dev-network.c b/hw/usb/dev-network.c
index 9d83974ec9f0..ac1adca54355 100644
--- a/hw/usb/dev-network.c
+++ b/hw/usb/dev-network.c
@@ -91,6 +91,8 @@ enum usbstring_idx {
 #define USB_CDC_SET_ETHERNET_PACKET_FILTER	0x43
 #define USB_CDC_GET_ETHERNET_STATISTIC		0x44
 
+#define USB_CDC_NETWORK_CONNECTION	0x00
+
 #define LOG2_STATUS_INTERVAL_MSEC	5    /* 1 << 5 == 32 msec */
 #define STATUS_BYTECOUNT		16   /* 8 byte header + data */
 
@@ -640,6 +642,8 @@ struct USBNetState {
     uint16_t filter;
     uint32_t vendorid;
 
+    uint16_t connection;
+
     unsigned int out_ptr;
     uint8_t out_buf[2048];
 
@@ -1140,18 +1144,28 @@ static void usb_net_handle_control(USBDevice *dev, USBPacket *p,
 
 static void usb_net_handle_statusin(USBNetState *s, USBPacket *p)
 {
-    le32 buf[2];
+    le32 rbuf[2];
+    uint16_t ebuf[4];
 
     if (p->iov.size < 8) {
         p->status = USB_RET_STALL;
         return;
     }
 
-    buf[0] = cpu_to_le32(1);
-    buf[1] = cpu_to_le32(0);
-    usb_packet_copy(p, buf, 8);
-    if (!s->rndis_resp.tqh_first) {
-        p->status = USB_RET_NAK;
+    if (is_rndis(s)) {
+        rbuf[0] = cpu_to_le32(1);
+        rbuf[1] = cpu_to_le32(0);
+        usb_packet_copy(p, rbuf, 8);
+        if (!s->rndis_resp.tqh_first) {
+            p->status = USB_RET_NAK;
+        }
+    } else {
+        ebuf[0] =
+            cpu_to_be16(ClassInterfaceRequest | USB_CDC_NETWORK_CONNECTION);
+        ebuf[1] = cpu_to_le16(s->connection);
+        ebuf[2] = cpu_to_le16(1);
+        ebuf[3] = cpu_to_le16(0);
+        usb_packet_copy(p, ebuf, 8);
     }
 
 #ifdef TRAFFIC_DEBUG
@@ -1366,6 +1380,7 @@ static void usb_net_realize(USBDevice *dev, Error **errp)
     s->media_state = 0;	/* NDIS_MEDIA_STATE_CONNECTED */;
     s->filter = 0;
     s->vendorid = 0x1234;
+    s->connection = 1;	/* Connected */
     s->intr = usb_ep_get(dev, USB_TOKEN_IN, 1);
     s->bulk_in = usb_ep_get(dev, USB_TOKEN_IN, 2);
 
-- 
2.37.3