Re: [libvirt] [PATCH v2] virnetdev: fix build with old kernel

Commit c9027d8f added a detection of NIC HW features, but some of them are not available in old kernel. Very old kernels lack enum ethtool_flags and even if this enum is present, not all values are available for all kernels. To be sure that we have everything in kernel that we need, we must check for existence of most of that flags, because only few of them were defined at first. Also to successfully build libvirt with older kernel we need to include <linux/types.h> before <linux/ethtool.h> to have __u32 and friends defined. Signed-off-by: Pavel Hrdina <phrdina(a)redhat.com&gt; --- configure.ac | 5 +++++ src/util/virnetdev.c | 43 +++++++++++++++++++++++++++---------------- 2 files changed, 32 insertions(+), 16 deletions(-) diff --git a/configure.ac b/configure.ac index e071813..2fedd1a 100644 --- a/configure.ac +++ b/configure.ac @@ -383,6 +383,11 @@ AC_CHECK_TYPE([struct ifreq], #include <net/if.h> ]]) +AC_CHECK_DECLS([ETH_FLAG_TXVLAN, ETH_FLAG_NTUPLE, ETH_FLAG_RXHASH, ETH_FLAG_LRO, + ETHTOOL_GGSO, ETHTOOL_GGRO, ETHTOOL_GFLAGS], + [], [], [[#include <linux/ethtool.h> + ]]) +