Re: [Qemu-devel] [PATCH v4 0/4] nonblocking connect address handling cleanup

["Michael S. Tsirkin" <mst@redhat.com>]

On Sun, Sep 23, 2012 at 04:49:03PM +0200, Orit Wasserman wrote:
> Changes from v3:
> 	- add missing parenthesis QEMU_SOCKET_RC_INPROGRESS macro
> 	- remove "block" from dummy_opts
> 	- remove in_progress from external API (inet_connect_opts and 
> 	  inet_nonblocking_connect)
> 	- Allocate ConnectState inside inet_connect_opts, this make the 
> 	  structure internal to qemu-sockets.c
> 	- fix migrate_fd_cleanup to handle invalid fd.
> 	
> Changes from v2:
> 	- remove the use of getnameinfo
> 	- remove errp for inet_connect_addr
> 	- remove QemuOpt "block"
> 	- fix errors in wait_for_connect 
> 	- pass ConnectState as a parameter to allow concurrent connect ops
> 
> getaddrinfo can give us a list of addresses, but we only try to
> connect to the first one. If that fails we never proceed to
> the next one.  This is common on desktop setups that often have ipv6
> configured but not actually working.
> A simple way to reproduce the problem is migration:
> for the destination use -incoming tcp:0:4444, run migrate -d tcp:localhost:4444
> migration will fail on hosts that have both IPv4 and IPV6 address for localhost.
> 
> To fix this, refactor address resolution code and make inet_nonblocking_connect
> retry connection with a different address.
> 
> Michael S. Tsirkin (1):
>   Refactor inet_connect_opts function
> 
> Orit Wasserman (3):
>   Separate inet_connect into inet_connect (blocking) and
>     inet_nonblocking_connect
>   Fix address handling in inet_nonblocking_connect
>   Clear handler only for valid fd

For the series:

Acked-by: Michael S. Tsirkin <mst@redhat.com>

This fixes regression in 1.2 so should go on a stable branch too I
guess.

>  migration-tcp.c |   37 ++------
>  migration.c     |    3 +-
>  nbd.c           |    2 +-
>  qemu-char.c     |    2 +-
>  qemu-sockets.c  |  246 +++++++++++++++++++++++++++++++++++++++---------------
>  qemu_socket.h   |   45 ++++++++++-
>  ui/vnc.c        |    2 +-
>  7 files changed, 233 insertions(+), 104 deletions(-)
> 
> -- 
> 1.7.7.6