datapath: Cleanup compat support.

cleanup various header file.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Acked-by: Jesse Gross <jesse@nicira.com>

datapath/linux/compat/include/linux/if_ether.h

@@ -3,19 +3,6 @@
 
 #include_next <linux/if_ether.h>
 
-#include <linux/version.h>
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28)
-
-#define ETH_P_TEB      0x6558          /* Trans Ether Bridging         */
-
-#endif /* linux kernel < 2.6.28 */
-
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,30)
-
-#define ETH_P_FCOE	0x8906          /* Fibre Channel over Ethernet  */
-
-#endif /* linux kernel < 2.6.30 */
-
 #ifndef ETH_P_802_3_MIN
 #define ETH_P_802_3_MIN        0x0600
 #endif

datapath/linux/compat/include/linux/kernel.h

@@ -8,33 +8,6 @@
 
 #include <linux/version.h>
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28)
-#undef pr_emerg
-#define pr_emerg(fmt, ...) \
-	printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
-#undef pr_alert
-#define pr_alert(fmt, ...) \
-	printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
-#undef pr_crit
-#define pr_crit(fmt, ...) \
-	printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
-#undef pr_err
-#define pr_err(fmt, ...) \
-	printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
-#undef pr_warning
-#define pr_warning(fmt, ...) \
-	printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
-#undef pr_notice
-#define pr_notice(fmt, ...) \
-	printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
-#undef pr_info
-#define pr_info(fmt, ...) \
-	printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
-#undef pr_cont
-#define pr_cont(fmt, ...) \
-	printk(KERN_CONT fmt, ##__VA_ARGS__)
-#endif
-
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35)
 #define pr_warn pr_warning
 #endif
@@ -73,10 +46,6 @@
 
 #endif
 
-#if defined(CONFIG_PREEMPT) && LINUX_VERSION_CODE < KERNEL_VERSION(2,6,21)
-#error "CONFIG_PREEMPT is broken before 2.6.21--see commit 4498121ca3, \"[NET]: Handle disabled preemption in gfp_any()\""
-#endif
-
 #ifndef USHRT_MAX
 #define USHRT_MAX	((u16)(~0U))
 #define SHRT_MAX	((s16)(USHRT_MAX>>1))

datapath/linux/compat/include/linux/netdevice.h

@@ -6,15 +6,6 @@
 struct net;
 
 #include <linux/version.h>
-/* Before 2.6.21, struct net_device has a "struct class_device" member named
- * class_dev.  Beginning with 2.6.21, struct net_device instead has a "struct
- * device" member named dev.  Otherwise the usage of these members is pretty
- * much the same. */
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,21)
-#define NETDEV_DEV_MEMBER class_dev
-#else
-#define NETDEV_DEV_MEMBER dev
-#endif
 
 #ifndef to_net_dev
 #define to_net_dev(class) container_of(class, struct net_device, NETDEV_DEV_MEMBER)
@@ -25,53 +16,6 @@ extern struct sk_buff *(*openvswitch_handle_frame_hook)(struct sk_buff *skb);
 extern int nr_bridges;
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26)
-static inline
-struct net *dev_net(const struct net_device *dev)
-{
-#ifdef CONFIG_NET_NS
-	return dev->nd_net;
-#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,25)
-	return &init_net;
-#else
-	return NULL;
-#endif
-}
-
-static inline
-void dev_net_set(struct net_device *dev, const struct net *net)
-{
-#ifdef CONFIG_NET_NS
-	dev->nd_dev = net;
-#endif
-}
-#endif /* linux kernel < 2.6.26 */
-
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24)
-#define NETIF_F_NETNS_LOCAL 0
-#endif
-
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
-#define proc_net init_net.proc_net
-#endif
-
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32)
-typedef int netdev_tx_t;
-#endif
-
-#ifndef for_each_netdev
-/* Linux before 2.6.22 didn't have for_each_netdev at all. */
-#define for_each_netdev(net, d) for (d = dev_base; d; d = d->next)
-#elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24)
-/* Linux 2.6.24 added a network namespace pointer to the macro. */
-#undef for_each_netdev
-#define for_each_netdev(net, d) list_for_each_entry(d, &dev_base_head, dev_list)
-#endif
-
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20)
-#define net_xmit_eval(e)       ((e) == NET_XMIT_CN ? 0 : (e))
-#endif
-
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)
 extern void unregister_netdevice_queue(struct net_device *dev,
 					struct list_head *head);
@@ -112,20 +56,6 @@ static inline void netdev_rx_handler_unregister(struct net_device *dev)
 }
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
-#undef SET_ETHTOOL_OPS
-#define SET_ETHTOOL_OPS(netdev, ops) \
-	((netdev)->ethtool_ops = (struct ethtool_ops *)(ops))
-#endif
-
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24)
-#define dev_get_by_name(net, name) dev_get_by_name(name)
-#define dev_get_by_index(net, ifindex) dev_get_by_index(ifindex)
-#define __dev_get_by_name(net, name) __dev_get_by_name(name)
-#define __dev_get_by_index(net, ifindex) __dev_get_by_index(ifindex)
-#define dev_get_by_index_rcu(net, ifindex) dev_get_by_index_rcu(ifindex)
-#endif
-
 #ifndef HAVE_DEV_GET_BY_INDEX_RCU
 static inline struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
 {
@@ -143,17 +73,6 @@ static inline struct net_device *dev_get_by_index_rcu(struct net *net, int ifind
 #define NETIF_F_FSO 0
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,30)
-#define NETIF_F_FCOE_CRC	(1 << 24) /* FCoE CRC32 */
-#endif
-
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
-#define NETIF_F_IPV6_CSUM	16      /* Can checksum TCP/UDP over IPV6 */
-
-#define NETIF_F_V4_CSUM		(NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM)
-#define NETIF_F_V6_CSUM		(NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM)
-#endif
-
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38)
 #define skb_gso_segment rpl_skb_gso_segment
 struct sk_buff *rpl_skb_gso_segment(struct sk_buff *skb, u32 features);

datapath/linux/compat/include/linux/rculist.h

@@ -1,25 +1,7 @@
 #ifndef __LINUX_RCULIST_WRAPPER_H
 #define __LINUX_RCULIST_WRAPPER_H
 
-#include <linux/version.h>
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26)
 #include_next <linux/rculist.h>
-#else
-/* Prior to 2.6.26, the contents of rculist.h were part of list.h. */
-#include <linux/list.h>
-#include <linux/rcupdate.h>
-#endif
-
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,27)
-#define hlist_del_init_rcu rpl_hlist_del_init_rcu
-static inline void hlist_del_init_rcu(struct hlist_node *n)
-{
-	if (!hlist_unhashed(n)) {
-		__hlist_del(n);
-		n->pprev = NULL;
-	}
-}
-#endif
 
 #ifndef hlist_first_rcu
 #define hlist_first_rcu(head)   (*((struct hlist_node __rcu **)(&(head)->first)))

datapath/linux/compat/include/linux/skbuff.h

@@ -5,17 +5,6 @@
 
 #include <linux/version.h>
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24)
-/* In version 2.6.24 the return type of skb_headroom() changed from 'int' to
- * 'unsigned int'.  We use skb_headroom() as one arm of a min(a,b) invocation
- * in make_writable() in actions.c, so we need the correct type. */
-#define skb_headroom rpl_skb_headroom
-static inline unsigned int rpl_skb_headroom(const struct sk_buff *skb)
-{
-	return skb->data - skb->head;
-}
-#endif
-
 #ifndef HAVE_SKB_COPY_FROM_LINEAR_DATA_OFFSET
 static inline void skb_copy_from_linear_data_offset(const struct sk_buff *skb,
 						    const int offset, void *to,
@@ -82,13 +71,6 @@ static inline int skb_cow_head(struct sk_buff *skb, unsigned int headroom)
 }
 #endif	/* !HAVE_SKB_COW_HEAD */
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
-static inline int skb_clone_writable(struct sk_buff *skb, int len)
-{
-	return false;
-}
-#endif
-
 #ifndef HAVE_SKB_DST_ACCESSOR_FUNCS
 static inline struct dst_entry *skb_dst(const struct sk_buff *skb)
 {
@@ -106,18 +88,6 @@ static inline struct rtable *skb_rtable(const struct sk_buff *skb)
 }
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,17)
-/* Emulate Linux 2.6.17 and later behavior, in which kfree_skb silently ignores
- * null pointer arguments. */
-#define kfree_skb(skb) kfree_skb_maybe_null(skb)
-static inline void kfree_skb_maybe_null(struct sk_buff *skb)
-{
-	if (likely(skb != NULL))
-		(kfree_skb)(skb);
-}
-#endif
-
-
 #ifndef CHECKSUM_PARTIAL
 #define CHECKSUM_PARTIAL CHECKSUM_HW
 #endif
@@ -196,21 +166,6 @@ static inline void skb_copy_to_linear_data(struct sk_buff *skb,
 }
 #endif	/* !HAVE_SKBUFF_HEADER_HELPERS */
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18)
-#warning "TSO/UFO not supported on kernels earlier than 2.6.18"
-
-static inline int skb_is_gso(const struct sk_buff *skb)
-{
-	return 0;
-}
-
-static inline struct sk_buff *skb_gso_segment(struct sk_buff *skb,
-					      int features)
-{
-	return NULL;
-}
-#endif	/* before 2.6.18 */
-
 #ifndef HAVE_SKB_WARN_LRO
 #ifndef NETIF_F_LRO
 static inline bool skb_warn_if_lro(const struct sk_buff *skb)