From c67f5dc10573687497f0f5c3aec19b15c35c63d7 Mon Sep 17 00:00:00 2001 From: Stefan Hajnoczi 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 --- net.c | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-) diff --git a/net.c b/net.c index d9ba1e5b74..a187a7b3db 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->info->receive_iov) { - return nc->info->receive_iov(nc, iov, iovcnt); - } else { - return nc_sendv_compat(nc, iov, iovcnt); + if (nc->receive_disabled) { + return 0; } + + if (nc->info->receive_iov) { + ret = nc->info->receive_iov(nc, iov, iovcnt); + } else { + ret = nc_sendv_compat(nc, iov, iovcnt); + } + + if (ret == 0) { + nc->receive_disabled = 1; + } + + return ret; } ssize_t qemu_sendv_packet_async(NetClientState *sender,