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From 14294fa1c903ab239bce3d2839e9e1883141b4f1 Mon Sep 17 00:00:00 2001
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From: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
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Date: Fri, 24 Aug 2012 13:37:29 +0100
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Subject: [PATCH] net: fix usbnet_receive() packet drops
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The USB network interface has a single buffer which the guest reads
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from. This patch prevents multiple calls to usbnet_receive() from
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clobbering the input buffer. Instead we queue packets until buffer
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space becomes available again.
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This is inspired by virtio-net and e1000 rxbuf handling.
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Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
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(cherry picked from commit 190563f9a90c9df8ad32fc7f3e4b166deda949a6)
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Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
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---
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hw/usb/dev-network.c | 19 ++++++++++++++++---
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1 file changed, 16 insertions(+), 3 deletions(-)
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diff --git a/hw/usb/dev-network.c b/hw/usb/dev-network.c
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index 0b5cb71..e4a4359 100644
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--- a/hw/usb/dev-network.c
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+++ b/hw/usb/dev-network.c
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@@ -1001,6 +1001,13 @@ static int rndis_keepalive_response(USBNetState *s,
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return 0;
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}
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+/* Prepare to receive the next packet */
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+static void usb_net_reset_in_buf(USBNetState *s)
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+{
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+ s->in_ptr = s->in_len = 0;
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+ qemu_flush_queued_packets(&s->nic->nc);
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+}
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+
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static int rndis_parse(USBNetState *s, uint8_t *data, int length)
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{
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uint32_t msg_type;
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@@ -1025,7 +1032,8 @@ static int rndis_parse(USBNetState *s, uint8_t *data, int length)
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case RNDIS_RESET_MSG:
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rndis_clear_responsequeue(s);
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- s->out_ptr = s->in_ptr = s->in_len = 0;
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+ s->out_ptr = 0;
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+ usb_net_reset_in_buf(s);
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return rndis_reset_response(s, (rndis_reset_msg_type *) data);
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case RNDIS_KEEPALIVE_MSG:
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@@ -1135,7 +1143,7 @@ static int usb_net_handle_datain(USBNetState *s, USBPacket *p)
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int ret = USB_RET_NAK;
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if (s->in_ptr > s->in_len) {
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- s->in_ptr = s->in_len = 0;
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+ usb_net_reset_in_buf(s);
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ret = USB_RET_NAK;
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return ret;
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}
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@@ -1152,7 +1160,7 @@ static int usb_net_handle_datain(USBNetState *s, USBPacket *p)
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if (s->in_ptr >= s->in_len &&
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(is_rndis(s) || (s->in_len & (64 - 1)) || !ret)) {
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/* no short packet necessary */
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- s->in_ptr = s->in_len = 0;
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+ usb_net_reset_in_buf(s);
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}
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#ifdef TRAFFIC_DEBUG
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@@ -1263,6 +1271,11 @@ static ssize_t usbnet_receive(NetClientState *nc, const uint8_t *buf, size_t siz
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return -1;
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}
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+ /* Only accept packet if input buffer is empty */
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+ if (s->in_len > 0) {
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+ return 0;
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+ }
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+
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if (is_rndis(s)) {
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struct rndis_packet_msg_type *msg;
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--
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1.7.12.1
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