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Re: [PATCH] ipvsadm: fix compiling tool on distros with only libnl-1

To: Jesper Dangaard Brouer <jbrouer@xxxxxxxxxx>
Subject: Re: [PATCH] ipvsadm: fix compiling tool on distros with only libnl-1
Cc: Simon Horman <horms@xxxxxxxxxxxx>, "Ryan O'Hara" <rohara@xxxxxxxxxx>, Jesper Dangaard Brouer <brouer@xxxxxxxxxx>, Wensong Zhang <wensong@xxxxxxxxxxxx>, Thomas Graf <tgraf@xxxxxxxxxx>, Julian Anastasov <ja@xxxxxx>, lvs-devel@xxxxxxxxxxxxxxx
From: Daniel Borkmann <dborkman@xxxxxxxxxx>
Date: Fri, 09 Aug 2013 08:55:52 +0200
On 08/09/2013 08:43 AM, Jesper Dangaard Brouer wrote:
On Fri, 9 Aug 2013 14:47:36 +0900
Simon Horman <horms@xxxxxxxxxxxx> wrote:

On Thu, Aug 08, 2013 at 03:00:17PM -0500, Ryan O'Hara wrote:
On Thu, Aug 08, 2013 at 02:10:54PM +0200, Jesper Dangaard Brouer wrote:
Some distros have not moved to libnl3 yet.  Add a fallback option
for compiling on distro's with only libnl1.

Using pkg-config to detect what versions of libnl is available.

Signed-off-by: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>

This patch looks fine, but I think it only solves part of the
problem. The Makefile still contains following code:

This, patch only address making libnl1 work again.

ifneq (0,$(HAVE_NL))
LIBS            += -lnl
endif

First, I think the HAVE_NL conditional can be removed. But more
importantly the correct netlink library should be appended to the
LIBS variable. With the current code we'll always link against
libnl-1.

True. It seems to me that the libnl3 work have not been fully completed.
And the reason Simon send the "Allow override of CFLAGS", which allowed
him to compile with libnl3 via:

  make CFLAGS='-I/usr/include/libnl3' LIBS='-lnl-3 -lnl-genl-3 -lpopt'

On Fedora with both libnl and libnl-3 installed:

$ pkg-config --libs libnl-3.0
-lnl-3
$ pkg-config --libs libnl-1
-lnl

Ryan

Daniel could you amend your patch or provide a second patch
to use pkg-confog for LIBS too. It seems like a good idea to me.

I think a second patch, to address libnl3 issues would be best.

Agreed, will do that after yours got into the tree.

---
  libipvs/Makefile  |    5 +++++
  libipvs/libipvs.c |    5 +++++
  2 files changed, 10 insertions(+)

diff --git a/libipvs/Makefile b/libipvs/Makefile
index a527a7f..eafc3e5 100644
--- a/libipvs/Makefile
+++ b/libipvs/Makefile
@@ -10,6 +10,11 @@ INCLUDE              += $(shell if [ -f ../../ip_vs.h ]; 
then        \
                     echo "-I../../."; fi;)
  DEFINES               = $(shell if [ ! -f ../../ip_vs.h ]; then       \
                    echo "-DHAVE_NET_IP_VS_H"; fi;)
+DEFINES                += $(shell if which pkg-config > /dev/null 2>&1; then \
+                        if   pkg-config --exists libnl-3.0; then :; \
+                        elif pkg-config --exists libnl-2.0; then :; \
+                        elif pkg-config --exists libnl-1; \
+                        then echo "-DFALLBACK_LIBNL1"; fi; fi)

  .PHONY                = all clean install dist distclean rpm rpms
  STATIC_LIB    = libipvs.a
diff --git a/libipvs/libipvs.c b/libipvs/libipvs.c
index c3c3b0a..2b066d2 100644
--- a/libipvs/libipvs.c
+++ b/libipvs/libipvs.c
@@ -32,6 +32,11 @@ static void* ipvs_func = NULL;
  struct ip_vs_getinfo ipvs_info;

  #ifdef LIBIPVS_USE_NL
+#ifdef FALLBACK_LIBNL1
+#define nl_sock         nl_handle
+#define nl_socket_alloc nl_handle_alloc
+#define nl_socket_free  nl_handle_destroy
+#endif
  static struct nl_sock *sock = NULL;
  static int family, try_nl = 1;
  #endif



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