qemu/0190-net-add-receive_disabled-logic-to-iov-delivery-path.patch

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2012-10-28 18:05:07 +00:00
From eccdc01e744cf3a389a527406f4d529420133e89 Mon Sep 17 00:00:00 2001
From: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Date: Fri, 17 Aug 2012 21:16:42 +0100
Subject: [PATCH] net: add receive_disabled logic to iov delivery path
This patch adds the missing NetClient->receive_disabled logic in the
sendv delivery code path. It seems that commit
893379efd0e1b84ceb0c42a713293f3dbd27b1bd ("net: disable receiving if
client returns zero") only added the logic to qemu_deliver_packet() and
not qemu_deliver_packet_iov().
The receive_disabled flag should be automatically set when .receive(),
.receive_raw(), or .receive_iov() return 0. No further packets will be
delivered to the NetClient until the receive_disabled flag is cleared
again by calling qemu_flush_queued_packets().
Typically the NetClient will wait until its file descriptor becomes
writable and then invoke qemu_flush_queued_packets() to resume
transmission.
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
(cherry picked from commit c67f5dc10573687497f0f5c3aec19b15c35c63d7)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
net.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/net.c b/net.c
index 76a8336..1303819 100644
--- a/net.c
+++ b/net.c
@@ -423,16 +423,27 @@ ssize_t qemu_deliver_packet_iov(NetClientState *sender,
void *opaque)
{
NetClientState *nc = opaque;
+ int ret;
if (nc->link_down) {
return iov_size(iov, iovcnt);
}
+ if (nc->receive_disabled) {
+ return 0;
+ }
+
if (nc->info->receive_iov) {
- return nc->info->receive_iov(nc, iov, iovcnt);
+ ret = nc->info->receive_iov(nc, iov, iovcnt);
} else {
- return nc_sendv_compat(nc, iov, iovcnt);
+ ret = nc_sendv_compat(nc, iov, iovcnt);
}
+
+ if (ret == 0) {
+ nc->receive_disabled = 1;
+ }
+
+ return ret;
}
ssize_t qemu_sendv_packet_async(NetClientState *sender,
--
1.8.0.2
2012-10-28 18:05:07 +00:00