Re: [Xen-devel] [PATCH v12 2/7] remus: add libnl3 dependency for network buffering support

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Fri, Jun 20, 2014 at 03:04:27PM +0800, Yang Hongyang wrote:
> Libnl3 is required for controlling Remus network buffering.
> This patch adds dependency on libnl3 (>= 3.2.8) to autoconf scripts.
> Also provide ability to configure tools without libnl3 support, that
> is without network buffering support.
> 
> when there's no network buffering support,libxl__netbuffer_enabled()
> returns 0, otherwise returns 1. The callers of this api will be
> introduced in the rest of the series.
> 
> NOTE: This patch changes tools/configure.ac, please rerun
>       autogen.sh while apply the patch.
> Signed-off-by: Shriram Rajagopalan <rshriram@xxxxxxxxx>
> Signed-off-by: Lai Jiangshan <laijs@xxxxxxxxxxxxxx>
> Signed-off-by: Yang Hongyang <yanghy@xxxxxxxxxxxxxx>
> Reviewed-by: Wen Congyang <wency@xxxxxxxxxxxxxx>
> ---
>  README                          |  4 ++++
>  config/Tools.mk.in              |  4 ++++
>  tools/configure.ac              | 16 ++++++++++++++++
>  tools/libxl/Makefile            | 13 +++++++++++++
>  tools/libxl/libxl_internal.h    |  1 +
>  tools/libxl/libxl_netbuffer.c   | 31 +++++++++++++++++++++++++++++++
>  tools/libxl/libxl_nonetbuffer.c | 31 +++++++++++++++++++++++++++++++
>  tools/remus/README              |  6 ++++++
>  8 files changed, 106 insertions(+)
>  create mode 100644 tools/libxl/libxl_netbuffer.c
>  create mode 100644 tools/libxl/libxl_nonetbuffer.c
> 
> diff --git a/README b/README
> index 9bbe734..e770932 100644
> --- a/README
> +++ b/README
> @@ -72,6 +72,10 @@ disabled at compile time:
>      * cmake (if building vtpm stub domains)
>      * markdown
>      * figlet (for generating the traditional Xen start of day banner)
> +    * Development install of libnl3 (e.g., libnl-3-200,
> +      libnl-3-dev, etc).  Required if network buffering is desired
> +      when using Remus with libxl.  See tools/remus/README for detailed
> +      information.
>  
>  Second, you need to acquire a suitable kernel for use in domain 0. If
>  possible you should use a kernel provided by your OS distributor. If
> diff --git a/config/Tools.mk.in b/config/Tools.mk.in
> index 84b2612..06c9d25 100644
> --- a/config/Tools.mk.in
> +++ b/config/Tools.mk.in
> @@ -38,6 +38,9 @@ PTHREAD_LIBS        := @PTHREAD_LIBS@
>  
>  PTYFUNCS_LIBS       := @PTYFUNCS_LIBS@
>  
> +LIBNL3_LIBS         := @LIBNL3_LIBS@
> +LIBNL3_CFLAGS       := @LIBNL3_CFLAGS@
> +
>  # Download GIT repositories via HTTP or GIT's own protocol?
>  # GIT's protocol is faster and more robust, when it works at all (firewalls
>  # may block it). We make it the default, but if your GIT repository downloads
> @@ -56,6 +59,7 @@ CONFIG_QEMU_XEN     := @qemu_xen@
>  CONFIG_BLKTAP1      := @blktap1@
>  CONFIG_VTPM         := @vtpm@
>  CONFIG_QEMUU_EXTRA_ARGS:= @EXTRA_QEMUU_CONFIGURE_ARGS@
> +CONFIG_REMUS_NETBUF := @remus_netbuf@
>  
>  #System options
>  ZLIB                := @zlib@
> diff --git a/tools/configure.ac b/tools/configure.ac
> index 9db798b..6deed8f 100644
> --- a/tools/configure.ac
> +++ b/tools/configure.ac
> @@ -267,5 +267,21 @@ esac
>  # Checks for header files.
>  AC_CHECK_HEADERS([yajl/yajl_version.h sys/eventfd.h valgrind/memcheck.h 
> utmp.h])
>  
> +# Check for libnl3 >=3.2.8. If present enable remus network buffering.
> +PKG_CHECK_MODULES(LIBNL3, [libnl-3.0 >= 3.2.8 libnl-route-3.0 >= 3.2.8],
> +    [libnl3_lib="y"], [libnl3_lib="n"])
> +
> +AS_IF([test "x$libnl3_lib" = "xn" ], [
> +    AC_MSG_WARN([Disabling support for Remus network buffering.
> +    Please install libnl3 libraries, command line tools and devel
> +    headers - version 3.2.8 or higher])
> +    AC_SUBST(remus_netbuf, [n])
> +    ],[
> +    AC_SUBST(remus_netbuf, [y])
> +])
> +
> +AC_SUBST(LIBNL3_LIBS)
> +AC_SUBST(LIBNL3_CFLAGS)
> +
>  AC_OUTPUT()
>  
> diff --git a/tools/libxl/Makefile b/tools/libxl/Makefile
> index 7fc42c8..fdffff3 100644
> --- a/tools/libxl/Makefile
> +++ b/tools/libxl/Makefile
> @@ -21,11 +21,17 @@ endif
>  
>  LIBXL_LIBS =
>  LIBXL_LIBS = $(LDLIBS_libxenctrl) $(LDLIBS_libxenguest) 
> $(LDLIBS_libxenstore) $(LDLIBS_libblktapctl) $(PTYFUNCS_LIBS) $(LIBUUID_LIBS)
> +ifeq ($(CONFIG_REMUS_NETBUF),y)
> +LIBXL_LIBS += $(LIBNL3_LIBS)
> +endif
>  
>  CFLAGS_LIBXL += $(CFLAGS_libxenctrl)
>  CFLAGS_LIBXL += $(CFLAGS_libxenguest)
>  CFLAGS_LIBXL += $(CFLAGS_libxenstore)
>  CFLAGS_LIBXL += $(CFLAGS_libblktapctl) 
> +ifeq ($(CONFIG_REMUS_NETBUF),y)
> +CFLAGS_LIBXL += $(LIBNL3_CFLAGS)
> +endif
>  CFLAGS_LIBXL += -Wshadow
>  
>  LIBXL_LIBS-$(CONFIG_ARM) += -lfdt
> @@ -43,6 +49,13 @@ LIBXL_OBJS-y += libxl_blktap2.o
>  else
>  LIBXL_OBJS-y += libxl_noblktap2.o
>  endif
> +
> +ifeq ($(CONFIG_REMUS_NETBUF),y)
> +LIBXL_OBJS-y += libxl_netbuffer.o
> +else
> +LIBXL_OBJS-y += libxl_nonetbuffer.o
> +endif
> +
>  LIBXL_OBJS-$(CONFIG_X86) += libxl_cpuid.o libxl_x86.o
>  LIBXL_OBJS-$(CONFIG_ARM) += libxl_nocpuid.o libxl_arm.o
>  
> diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
> index a0d4f24..3fc90e2 100644
> --- a/tools/libxl/libxl_internal.h
> +++ b/tools/libxl/libxl_internal.h
> @@ -2470,6 +2470,7 @@ typedef struct libxl__save_helper_state {
>                        * marshalling and xc callback functions */
>  } libxl__save_helper_state;
>  
> +_hidden int libxl__netbuffer_enabled(libxl__gc *gc);
>  
>  /*----- Domain suspend (save) state structure -----*/
>  
> diff --git a/tools/libxl/libxl_netbuffer.c b/tools/libxl/libxl_netbuffer.c
> new file mode 100644
> index 0000000..8e23d75
> --- /dev/null
> +++ b/tools/libxl/libxl_netbuffer.c
> @@ -0,0 +1,31 @@
> +/*
> + * Copyright (C) 2013

.. There should be something past 2013. And you can just make
it 2014

> + * Author Shriram Rajagopalan <rshriram@xxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU Lesser General Public License as published
> + * by the Free Software Foundation; version 2.1 only. with the special
> + * exception on linking described in file LICENSE.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU Lesser General Public License for more details.
> + */
> +
> +#include "libxl_osdeps.h" /* must come before any other headers */
> +
> +#include "libxl_internal.h"
> +
> +int libxl__netbuffer_enabled(libxl__gc *gc)
> +{
> +    return 1;
> +}
> +
> +/*
> + * Local variables:
> + * mode: C
> + * c-basic-offset: 4
> + * indent-tabs-mode: nil
> + * End:
> + */
> diff --git a/tools/libxl/libxl_nonetbuffer.c b/tools/libxl/libxl_nonetbuffer.c
> new file mode 100644
> index 0000000..6aa4bf1
> --- /dev/null
> +++ b/tools/libxl/libxl_nonetbuffer.c
> @@ -0,0 +1,31 @@
> +/*
> + * Copyright (C) 2013

Ditto.
> + * Author Shriram Rajagopalan <rshriram@xxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU Lesser General Public License as published
> + * by the Free Software Foundation; version 2.1 only. with the special
> + * exception on linking described in file LICENSE.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU Lesser General Public License for more details.
> + */
> +
> +#include "libxl_osdeps.h" /* must come before any other headers */
> +
> +#include "libxl_internal.h"
> +
> +int libxl__netbuffer_enabled(libxl__gc *gc)
> +{
> +    return 0;
> +}
> +
> +/*
> + * Local variables:
> + * mode: C
> + * c-basic-offset: 4
> + * indent-tabs-mode: nil
> + * End:
> + */
> diff --git a/tools/remus/README b/tools/remus/README
> index 9e8140b..4736252 100644
> --- a/tools/remus/README
> +++ b/tools/remus/README
> @@ -2,3 +2,9 @@ Remus provides fault tolerance for virtual machines by 
> sending continuous
>  checkpoints to a backup, which will activate if the target VM fails.
>  
>  See the website at http://nss.cs.ubc.ca/remus/ for details.
> +
> +Using Remus with libxl on Xen 4.4 and higher:

Might want to say Xen 4.5 and higher since this is for Xen 4.5
> + To enable network buffering, you need libnl 3.2.8
> + or higher along with the development headers and command line utilities.
> + If your distro does not have the appropriate libnl3 version, you can find
> + the latest source tarball of libnl3 at 
> http://www.carisma.slowglass.com/~tgr/libnl/
> -- 
> 1.9.1
> 
> 
> _______________________________________________
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