From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/include/net/dst.h | 527 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 527 insertions(+) create mode 100644 kernel/include/net/dst.h (limited to 'kernel/include/net/dst.h') diff --git a/kernel/include/net/dst.h b/kernel/include/net/dst.h new file mode 100644 index 000000000..b6a790646 --- /dev/null +++ b/kernel/include/net/dst.h @@ -0,0 +1,527 @@ +/* + * net/dst.h Protocol independent destination cache definitions. + * + * Authors: Alexey Kuznetsov, + * + */ + +#ifndef _NET_DST_H +#define _NET_DST_H + +#include +#include +#include +#include +#include +#include +#include +#include + +#define DST_GC_MIN (HZ/10) +#define DST_GC_INC (HZ/2) +#define DST_GC_MAX (120*HZ) + +/* Each dst_entry has reference count and sits in some parent list(s). + * When it is removed from parent list, it is "freed" (dst_free). + * After this it enters dead state (dst->obsolete > 0) and if its refcnt + * is zero, it can be destroyed immediately, otherwise it is added + * to gc list and garbage collector periodically checks the refcnt. + */ + +struct sk_buff; + +struct dst_entry { + struct rcu_head rcu_head; + struct dst_entry *child; + struct net_device *dev; + struct dst_ops *ops; + unsigned long _metrics; + unsigned long expires; + struct dst_entry *path; + struct dst_entry *from; +#ifdef CONFIG_XFRM + struct xfrm_state *xfrm; +#else + void *__pad1; +#endif + int (*input)(struct sk_buff *); + int (*output)(struct sock *sk, struct sk_buff *skb); + + unsigned short flags; +#define DST_HOST 0x0001 +#define DST_NOXFRM 0x0002 +#define DST_NOPOLICY 0x0004 +#define DST_NOHASH 0x0008 +#define DST_NOCACHE 0x0010 +#define DST_NOCOUNT 0x0020 +#define DST_FAKE_RTABLE 0x0040 +#define DST_XFRM_TUNNEL 0x0080 +#define DST_XFRM_QUEUE 0x0100 + + unsigned short pending_confirm; + + short error; + + /* A non-zero value of dst->obsolete forces by-hand validation + * of the route entry. Positive values are set by the generic + * dst layer to indicate that the entry has been forcefully + * destroyed. + * + * Negative values are used by the implementation layer code to + * force invocation of the dst_ops->check() method. + */ + short obsolete; +#define DST_OBSOLETE_NONE 0 +#define DST_OBSOLETE_DEAD 2 +#define DST_OBSOLETE_FORCE_CHK -1 +#define DST_OBSOLETE_KILL -2 + unsigned short header_len; /* more space at head required */ + unsigned short trailer_len; /* space to reserve at tail */ +#ifdef CONFIG_IP_ROUTE_CLASSID + __u32 tclassid; +#else + __u32 __pad2; +#endif + + /* + * Align __refcnt to a 64 bytes alignment + * (L1_CACHE_SIZE would be too much) + */ +#ifdef CONFIG_64BIT + long __pad_to_align_refcnt[2]; +#endif + /* + * __refcnt wants to be on a different cache line from + * input/output/ops or performance tanks badly + */ + atomic_t __refcnt; /* client references */ + int __use; + unsigned long lastuse; + union { + struct dst_entry *next; + struct rtable __rcu *rt_next; + struct rt6_info *rt6_next; + struct dn_route __rcu *dn_next; + }; +}; + +u32 *dst_cow_metrics_generic(struct dst_entry *dst, unsigned long old); +extern const u32 dst_default_metrics[]; + +#define DST_METRICS_READ_ONLY 0x1UL +#define DST_METRICS_FORCE_OVERWRITE 0x2UL +#define DST_METRICS_FLAGS 0x3UL +#define __DST_METRICS_PTR(Y) \ + ((u32 *)((Y) & ~DST_METRICS_FLAGS)) +#define DST_METRICS_PTR(X) __DST_METRICS_PTR((X)->_metrics) + +static inline bool dst_metrics_read_only(const struct dst_entry *dst) +{ + return dst->_metrics & DST_METRICS_READ_ONLY; +} + +static inline void dst_metrics_set_force_overwrite(struct dst_entry *dst) +{ + dst->_metrics |= DST_METRICS_FORCE_OVERWRITE; +} + +void __dst_destroy_metrics_generic(struct dst_entry *dst, unsigned long old); + +static inline void dst_destroy_metrics_generic(struct dst_entry *dst) +{ + unsigned long val = dst->_metrics; + if (!(val & DST_METRICS_READ_ONLY)) + __dst_destroy_metrics_generic(dst, val); +} + +static inline u32 *dst_metrics_write_ptr(struct dst_entry *dst) +{ + unsigned long p = dst->_metrics; + + BUG_ON(!p); + + if (p & DST_METRICS_READ_ONLY) + return dst->ops->cow_metrics(dst, p); + return __DST_METRICS_PTR(p); +} + +/* This may only be invoked before the entry has reached global + * visibility. + */ +static inline void dst_init_metrics(struct dst_entry *dst, + const u32 *src_metrics, + bool read_only) +{ + dst->_metrics = ((unsigned long) src_metrics) | + (read_only ? DST_METRICS_READ_ONLY : 0); +} + +static inline void dst_copy_metrics(struct dst_entry *dest, const struct dst_entry *src) +{ + u32 *dst_metrics = dst_metrics_write_ptr(dest); + + if (dst_metrics) { + u32 *src_metrics = DST_METRICS_PTR(src); + + memcpy(dst_metrics, src_metrics, RTAX_MAX * sizeof(u32)); + } +} + +static inline u32 *dst_metrics_ptr(struct dst_entry *dst) +{ + return DST_METRICS_PTR(dst); +} + +static inline u32 +dst_metric_raw(const struct dst_entry *dst, const int metric) +{ + u32 *p = DST_METRICS_PTR(dst); + + return p[metric-1]; +} + +static inline u32 +dst_metric(const struct dst_entry *dst, const int metric) +{ + WARN_ON_ONCE(metric == RTAX_HOPLIMIT || + metric == RTAX_ADVMSS || + metric == RTAX_MTU); + return dst_metric_raw(dst, metric); +} + +static inline u32 +dst_metric_advmss(const struct dst_entry *dst) +{ + u32 advmss = dst_metric_raw(dst, RTAX_ADVMSS); + + if (!advmss) + advmss = dst->ops->default_advmss(dst); + + return advmss; +} + +static inline void dst_metric_set(struct dst_entry *dst, int metric, u32 val) +{ + u32 *p = dst_metrics_write_ptr(dst); + + if (p) + p[metric-1] = val; +} + +static inline u32 +dst_feature(const struct dst_entry *dst, u32 feature) +{ + return dst_metric(dst, RTAX_FEATURES) & feature; +} + +static inline u32 dst_mtu(const struct dst_entry *dst) +{ + return dst->ops->mtu(dst); +} + +/* RTT metrics are stored in milliseconds for user ABI, but used as jiffies */ +static inline unsigned long dst_metric_rtt(const struct dst_entry *dst, int metric) +{ + return msecs_to_jiffies(dst_metric(dst, metric)); +} + +static inline u32 +dst_allfrag(const struct dst_entry *dst) +{ + int ret = dst_feature(dst, RTAX_FEATURE_ALLFRAG); + return ret; +} + +static inline int +dst_metric_locked(const struct dst_entry *dst, int metric) +{ + return dst_metric(dst, RTAX_LOCK) & (1<__refcnt); +} + +static inline void dst_use(struct dst_entry *dst, unsigned long time) +{ + dst_hold(dst); + dst->__use++; + dst->lastuse = time; +} + +static inline void dst_use_noref(struct dst_entry *dst, unsigned long time) +{ + dst->__use++; + dst->lastuse = time; +} + +static inline struct dst_entry *dst_clone(struct dst_entry *dst) +{ + if (dst) + atomic_inc(&dst->__refcnt); + return dst; +} + +void dst_release(struct dst_entry *dst); + +static inline void refdst_drop(unsigned long refdst) +{ + if (!(refdst & SKB_DST_NOREF)) + dst_release((struct dst_entry *)(refdst & SKB_DST_PTRMASK)); +} + +/** + * skb_dst_drop - drops skb dst + * @skb: buffer + * + * Drops dst reference count if a reference was taken. + */ +static inline void skb_dst_drop(struct sk_buff *skb) +{ + if (skb->_skb_refdst) { + refdst_drop(skb->_skb_refdst); + skb->_skb_refdst = 0UL; + } +} + +static inline void skb_dst_copy(struct sk_buff *nskb, const struct sk_buff *oskb) +{ + nskb->_skb_refdst = oskb->_skb_refdst; + if (!(nskb->_skb_refdst & SKB_DST_NOREF)) + dst_clone(skb_dst(nskb)); +} + +/** + * skb_dst_force - makes sure skb dst is refcounted + * @skb: buffer + * + * If dst is not yet refcounted, let's do it + */ +static inline void skb_dst_force(struct sk_buff *skb) +{ + if (skb_dst_is_noref(skb)) { + WARN_ON(!rcu_read_lock_held()); + skb->_skb_refdst &= ~SKB_DST_NOREF; + dst_clone(skb_dst(skb)); + } +} + + +/** + * __skb_tunnel_rx - prepare skb for rx reinsert + * @skb: buffer + * @dev: tunnel device + * @net: netns for packet i/o + * + * After decapsulation, packet is going to re-enter (netif_rx()) our stack, + * so make some cleanups. (no accounting done) + */ +static inline void __skb_tunnel_rx(struct sk_buff *skb, struct net_device *dev, + struct net *net) +{ + skb->dev = dev; + + /* + * Clear hash so that we can recalulate the hash for the + * encapsulated packet, unless we have already determine the hash + * over the L4 4-tuple. + */ + skb_clear_hash_if_not_l4(skb); + skb_set_queue_mapping(skb, 0); + skb_scrub_packet(skb, !net_eq(net, dev_net(dev))); +} + +/** + * skb_tunnel_rx - prepare skb for rx reinsert + * @skb: buffer + * @dev: tunnel device + * + * After decapsulation, packet is going to re-enter (netif_rx()) our stack, + * so make some cleanups, and perform accounting. + * Note: this accounting is not SMP safe. + */ +static inline void skb_tunnel_rx(struct sk_buff *skb, struct net_device *dev, + struct net *net) +{ + /* TODO : stats should be SMP safe */ + dev->stats.rx_packets++; + dev->stats.rx_bytes += skb->len; + __skb_tunnel_rx(skb, dev, net); +} + +/* Children define the path of the packet through the + * Linux networking. Thus, destinations are stackable. + */ + +static inline struct dst_entry *skb_dst_pop(struct sk_buff *skb) +{ + struct dst_entry *child = dst_clone(skb_dst(skb)->child); + + skb_dst_drop(skb); + return child; +} + +int dst_discard_sk(struct sock *sk, struct sk_buff *skb); +static inline int dst_discard(struct sk_buff *skb) +{ + return dst_discard_sk(skb->sk, skb); +} +void *dst_alloc(struct dst_ops *ops, struct net_device *dev, int initial_ref, + int initial_obsolete, unsigned short flags); +void __dst_free(struct dst_entry *dst); +struct dst_entry *dst_destroy(struct dst_entry *dst); + +static inline void dst_free(struct dst_entry *dst) +{ + if (dst->obsolete > 0) + return; + if (!atomic_read(&dst->__refcnt)) { + dst = dst_destroy(dst); + if (!dst) + return; + } + __dst_free(dst); +} + +static inline void dst_rcu_free(struct rcu_head *head) +{ + struct dst_entry *dst = container_of(head, struct dst_entry, rcu_head); + dst_free(dst); +} + +static inline void dst_confirm(struct dst_entry *dst) +{ + dst->pending_confirm = 1; +} + +static inline int dst_neigh_output(struct dst_entry *dst, struct neighbour *n, + struct sk_buff *skb) +{ + struct hh_cache *hh; + + if (dst->pending_confirm) { + unsigned long now = jiffies; + + dst->pending_confirm = 0; + /* avoid dirtying neighbour */ + if (n->confirmed != now) + n->confirmed = now; + } + + hh = &n->hh; + if ((n->nud_state & NUD_CONNECTED) && hh->hh_len) + return neigh_hh_output(hh, skb); + else + return n->output(n, skb); +} + +static inline struct neighbour *dst_neigh_lookup(const struct dst_entry *dst, const void *daddr) +{ + struct neighbour *n = dst->ops->neigh_lookup(dst, NULL, daddr); + return IS_ERR(n) ? NULL : n; +} + +static inline struct neighbour *dst_neigh_lookup_skb(const struct dst_entry *dst, + struct sk_buff *skb) +{ + struct neighbour *n = dst->ops->neigh_lookup(dst, skb, NULL); + return IS_ERR(n) ? NULL : n; +} + +static inline void dst_link_failure(struct sk_buff *skb) +{ + struct dst_entry *dst = skb_dst(skb); + if (dst && dst->ops && dst->ops->link_failure) + dst->ops->link_failure(skb); +} + +static inline void dst_set_expires(struct dst_entry *dst, int timeout) +{ + unsigned long expires = jiffies + timeout; + + if (expires == 0) + expires = 1; + + if (dst->expires == 0 || time_before(expires, dst->expires)) + dst->expires = expires; +} + +/* Output packet to network from transport. */ +static inline int dst_output_sk(struct sock *sk, struct sk_buff *skb) +{ + return skb_dst(skb)->output(sk, skb); +} +static inline int dst_output(struct sk_buff *skb) +{ + return dst_output_sk(skb->sk, skb); +} + +/* Input packet from network to transport. */ +static inline int dst_input(struct sk_buff *skb) +{ + return skb_dst(skb)->input(skb); +} + +static inline struct dst_entry *dst_check(struct dst_entry *dst, u32 cookie) +{ + if (dst->obsolete) + dst = dst->ops->check(dst, cookie); + return dst; +} + +void dst_init(void); + +/* Flags for xfrm_lookup flags argument. */ +enum { + XFRM_LOOKUP_ICMP = 1 << 0, + XFRM_LOOKUP_QUEUE = 1 << 1, + XFRM_LOOKUP_KEEP_DST_REF = 1 << 2, +}; + +struct flowi; +#ifndef CONFIG_XFRM +static inline struct dst_entry *xfrm_lookup(struct net *net, + struct dst_entry *dst_orig, + const struct flowi *fl, struct sock *sk, + int flags) +{ + return dst_orig; +} + +static inline struct dst_entry *xfrm_lookup_route(struct net *net, + struct dst_entry *dst_orig, + const struct flowi *fl, + struct sock *sk, + int flags) +{ + return dst_orig; +} + +static inline struct xfrm_state *dst_xfrm(const struct dst_entry *dst) +{ + return NULL; +} + +#else +struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig, + const struct flowi *fl, struct sock *sk, + int flags); + +struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig, + const struct flowi *fl, struct sock *sk, + int flags); + +/* skb attached with this dst needs transformation if dst->xfrm is valid */ +static inline struct xfrm_state *dst_xfrm(const struct dst_entry *dst) +{ + return dst->xfrm; +} +#endif + +#endif /* _NET_DST_H */ -- cgit 1.2.3-korg