datapath: Account for RHEL6.4 backports in compat layer

Explicitly check the availability of several kernel API functions
instead of relying on the kernel version to account for Red Hat
Enterprise Linux backports.

Signed-off-by: Thomas Graf <tgraf@redhat.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>

diff --git a/acinclude.m4 b/acinclude.m4
index 2703bc4..34634a2 100644 (file)
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -224,6 +224,8 @@ AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_disable_lro])
   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_stats])
   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
+  OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [__skb_gso_segment])
+  OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [can_checksum_protocol])
 
   OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
                   [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
@@ -268,11 +270,16 @@ AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
 
   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [NLA_NUL_STRING])
   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
+  OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be16])
+  OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be32])
+  OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be64])
   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
 
   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [ADD_ALL_VLANS_CMD],
                   [OVS_DEFINE([HAVE_VLAN_BUG_WORKAROUND])])
 
+  OVS_GREP_IFELSE([$KSRC/include/linux/percpu.h], [this_cpu_ptr])
+
   OVS_GREP_IFELSE([$KSRC/include/linux/openvswitch.h], [openvswitch_handle_frame_hook],
                   [OVS_DEFINE([HAVE_RHEL_OVS_HOOK])])
 

diff --git a/datapath/linux/compat/include/asm/percpu.h b/datapath/linux/compat/include/asm/percpu.h
index 404b937..65bce08 100644 (file)
--- a/datapath/linux/compat/include/asm/percpu.h
+++ b/datapath/linux/compat/include/asm/percpu.h
@@ -3,7 +3,7 @@
 
 #include_next <asm/percpu.h>
 
-#ifndef this_cpu_ptr
+#if !defined this_cpu_ptr && !defined HAVE_THIS_CPU_PTR
 #define this_cpu_ptr(ptr) per_cpu_ptr(ptr, smp_processor_id())
 #endif
 

diff --git a/datapath/linux/compat/include/linux/netdevice.h b/datapath/linux/compat/include/linux/netdevice.h
index 71aad87..f8240df 100644 (file)
--- a/datapath/linux/compat/include/linux/netdevice.h
+++ b/datapath/linux/compat/include/linux/netdevice.h
@@ -158,7 +158,7 @@ static inline int rpl_netif_needs_gso(struct sk_buff *skb, int features)
 typedef u32 netdev_features_t;
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(3,9,0)
+#ifndef HAVE___SKB_GSO_SEGMENT
 static inline struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
                                                netdev_features_t features,
                                                bool tx_path)

diff --git a/datapath/linux/compat/include/net/netlink.h b/datapath/linux/compat/include/net/netlink.h
index 9616ea9..308cd69 100644 (file)
--- a/datapath/linux/compat/include/net/netlink.h
+++ b/datapath/linux/compat/include/net/netlink.h
@@ -85,15 +85,21 @@ static inline __be64 nla_get_be64(const struct nlattr *nla)
 }
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(3,5,0)
+#ifndef HAVE_NLA_PUT_BE16
 static inline int nla_put_be16(struct sk_buff *skb, int attrtype, __be16 value)
 {
        return nla_put(skb, attrtype, sizeof(__be16), &value);
 }
+#endif
+
+#ifndef HAVE_NLA_PUT_BE32
 static inline int nla_put_be32(struct sk_buff *skb, int attrtype, __be32 value)
 {
        return nla_put(skb, attrtype, sizeof(__be32), &value);
 }
+#endif
+
+#ifndef HAVE_NLA_PUT_BE64
 static inline int nla_put_be64(struct sk_buff *skb, int attrtype, __be64 value)
 {
        return nla_put(skb, attrtype, sizeof(__be64), &value);

diff --git a/datapath/linux/compat/netdevice.c b/datapath/linux/compat/netdevice.c
index 9e92eeb..d26fb5e 100644 (file)
--- a/datapath/linux/compat/netdevice.c
+++ b/datapath/linux/compat/netdevice.c
@@ -2,6 +2,7 @@
 #include <linux/if_vlan.h>
 
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38)
+#ifndef HAVE_CAN_CHECKSUM_PROTOCOL
 static bool can_checksum_protocol(unsigned long features, __be16 protocol)
 {
        return  ((features & NETIF_F_GEN_CSUM) ||
@@ -12,6 +13,7 @@ static bool can_checksum_protocol(unsigned long features, __be16 protocol)
                ((features & NETIF_F_FCOE_CRC) &&
                                protocol == htons(ETH_P_FCOE)));
 }
+#endif
 
 static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
 {