ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/net/core/dst.c b/marvell/linux/net/core/dst.c
new file mode 100644
index 0000000..107aea2
--- /dev/null
+++ b/marvell/linux/net/core/dst.c
@@ -0,0 +1,328 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * net/core/dst.c Protocol independent destination cache.
+ *
+ * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ *
+ */
+
+#include <linux/bitops.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/workqueue.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <net/net_namespace.h>
+#include <linux/sched.h>
+#include <linux/prefetch.h>
+#include <net/lwtunnel.h>
+#include <net/xfrm.h>
+
+#include <net/dst.h>
+#include <net/dst_metadata.h>
+
+int dst_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
+{
+ kfree_skb(skb);
+ return 0;
+}
+EXPORT_SYMBOL(dst_discard_out);
+
+const struct dst_metrics dst_default_metrics = {
+ /* This initializer is needed to force linker to place this variable
+ * into const section. Otherwise it might end into bss section.
+ * We really want to avoid false sharing on this variable, and catch
+ * any writes on it.
+ */
+ .refcnt = REFCOUNT_INIT(1),
+};
+EXPORT_SYMBOL(dst_default_metrics);
+
+void dst_init(struct dst_entry *dst, struct dst_ops *ops,
+ struct net_device *dev, int initial_ref, int initial_obsolete,
+ unsigned short flags)
+{
+ dst->dev = dev;
+ if (dev)
+ dev_hold(dev);
+ dst->ops = ops;
+ dst_init_metrics(dst, dst_default_metrics.metrics, true);
+ dst->expires = 0UL;
+#ifdef CONFIG_XFRM
+ dst->xfrm = NULL;
+#endif
+ dst->input = dst_discard;
+ dst->output = dst_discard_out;
+ dst->error = 0;
+ dst->obsolete = initial_obsolete;
+ dst->header_len = 0;
+ dst->trailer_len = 0;
+#ifdef CONFIG_IP_ROUTE_CLASSID
+ dst->tclassid = 0;
+#endif
+ dst->lwtstate = NULL;
+ atomic_set(&dst->__refcnt, initial_ref);
+ dst->__use = 0;
+ dst->lastuse = jiffies;
+ dst->flags = flags;
+ if (!(flags & DST_NOCOUNT))
+ dst_entries_add(ops, 1);
+}
+EXPORT_SYMBOL(dst_init);
+
+void *dst_alloc(struct dst_ops *ops, struct net_device *dev,
+ int initial_ref, int initial_obsolete, unsigned short flags)
+{
+ struct dst_entry *dst;
+
+ if (ops->gc &&
+ !(flags & DST_NOCOUNT) &&
+ dst_entries_get_fast(ops) > ops->gc_thresh)
+ ops->gc(ops);
+
+ dst = kmem_cache_alloc(ops->kmem_cachep, GFP_ATOMIC);
+ if (!dst)
+ return NULL;
+
+ dst_init(dst, ops, dev, initial_ref, initial_obsolete, flags);
+
+ return dst;
+}
+EXPORT_SYMBOL(dst_alloc);
+
+struct dst_entry *dst_destroy(struct dst_entry * dst)
+{
+ struct dst_entry *child = NULL;
+
+ smp_rmb();
+
+#ifdef CONFIG_XFRM
+ if (dst->xfrm) {
+ struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
+
+ child = xdst->child;
+ }
+#endif
+ if (!(dst->flags & DST_NOCOUNT))
+ dst_entries_add(dst->ops, -1);
+
+ if (dst->ops->destroy)
+ dst->ops->destroy(dst);
+ if (dst->dev)
+ dev_put(dst->dev);
+
+ lwtstate_put(dst->lwtstate);
+
+ if (dst->flags & DST_METADATA)
+ metadata_dst_free((struct metadata_dst *)dst);
+ else
+ kmem_cache_free(dst->ops->kmem_cachep, dst);
+
+ dst = child;
+ if (dst)
+ dst_release_immediate(dst);
+ return NULL;
+}
+EXPORT_SYMBOL(dst_destroy);
+
+static void dst_destroy_rcu(struct rcu_head *head)
+{
+ struct dst_entry *dst = container_of(head, struct dst_entry, rcu_head);
+
+ dst = dst_destroy(dst);
+}
+
+/* Operations to mark dst as DEAD and clean up the net device referenced
+ * by dst:
+ * 1. put the dst under loopback interface and discard all tx/rx packets
+ * on this route.
+ * 2. release the net_device
+ * This function should be called when removing routes from the fib tree
+ * in preparation for a NETDEV_DOWN/NETDEV_UNREGISTER event and also to
+ * make the next dst_ops->check() fail.
+ */
+void dst_dev_put(struct dst_entry *dst)
+{
+ struct net_device *dev = dst->dev;
+
+ dst->obsolete = DST_OBSOLETE_DEAD;
+ if (dst->ops->ifdown)
+ dst->ops->ifdown(dst, dev, true);
+ dst->input = dst_discard;
+ dst->output = dst_discard_out;
+ dst->dev = blackhole_netdev;
+ dev_hold(dst->dev);
+ dev_put(dev);
+}
+EXPORT_SYMBOL(dst_dev_put);
+
+void dst_release(struct dst_entry *dst)
+{
+ if (dst) {
+ int newrefcnt;
+
+ newrefcnt = atomic_dec_return(&dst->__refcnt);
+ if (WARN_ONCE(newrefcnt < 0, "dst_release underflow"))
+ net_warn_ratelimited("%s: dst:%p refcnt:%d\n",
+ __func__, dst, newrefcnt);
+ if (!newrefcnt)
+ call_rcu(&dst->rcu_head, dst_destroy_rcu);
+ }
+}
+EXPORT_SYMBOL(dst_release);
+
+void dst_release_immediate(struct dst_entry *dst)
+{
+ if (dst) {
+ int newrefcnt;
+
+ newrefcnt = atomic_dec_return(&dst->__refcnt);
+ if (WARN_ONCE(newrefcnt < 0, "dst_release_immediate underflow"))
+ net_warn_ratelimited("%s: dst:%p refcnt:%d\n",
+ __func__, dst, newrefcnt);
+ if (!newrefcnt)
+ dst_destroy(dst);
+ }
+}
+EXPORT_SYMBOL(dst_release_immediate);
+
+u32 *dst_cow_metrics_generic(struct dst_entry *dst, unsigned long old)
+{
+ struct dst_metrics *p = kmalloc(sizeof(*p), GFP_ATOMIC);
+
+ if (p) {
+ struct dst_metrics *old_p = (struct dst_metrics *)__DST_METRICS_PTR(old);
+ unsigned long prev, new;
+
+ refcount_set(&p->refcnt, 1);
+ memcpy(p->metrics, old_p->metrics, sizeof(p->metrics));
+
+ new = (unsigned long) p;
+ prev = cmpxchg(&dst->_metrics, old, new);
+
+ if (prev != old) {
+ kfree(p);
+ p = (struct dst_metrics *)__DST_METRICS_PTR(prev);
+ if (prev & DST_METRICS_READ_ONLY)
+ p = NULL;
+ } else if (prev & DST_METRICS_REFCOUNTED) {
+ if (refcount_dec_and_test(&old_p->refcnt))
+ kfree(old_p);
+ }
+ }
+ BUILD_BUG_ON(offsetof(struct dst_metrics, metrics) != 0);
+ return (u32 *)p;
+}
+EXPORT_SYMBOL(dst_cow_metrics_generic);
+
+/* Caller asserts that dst_metrics_read_only(dst) is false. */
+void __dst_destroy_metrics_generic(struct dst_entry *dst, unsigned long old)
+{
+ unsigned long prev, new;
+
+ new = ((unsigned long) &dst_default_metrics) | DST_METRICS_READ_ONLY;
+ prev = cmpxchg(&dst->_metrics, old, new);
+ if (prev == old)
+ kfree(__DST_METRICS_PTR(old));
+}
+EXPORT_SYMBOL(__dst_destroy_metrics_generic);
+
+static struct dst_ops md_dst_ops = {
+ .family = AF_UNSPEC,
+};
+
+static int dst_md_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
+{
+ WARN_ONCE(1, "Attempting to call output on metadata dst\n");
+ kfree_skb(skb);
+ return 0;
+}
+
+static int dst_md_discard(struct sk_buff *skb)
+{
+ WARN_ONCE(1, "Attempting to call input on metadata dst\n");
+ kfree_skb(skb);
+ return 0;
+}
+
+static void __metadata_dst_init(struct metadata_dst *md_dst,
+ enum metadata_type type, u8 optslen)
+
+{
+ struct dst_entry *dst;
+
+ dst = &md_dst->dst;
+ dst_init(dst, &md_dst_ops, NULL, 1, DST_OBSOLETE_NONE,
+ DST_METADATA | DST_NOCOUNT);
+
+ dst->input = dst_md_discard;
+ dst->output = dst_md_discard_out;
+
+ memset(dst + 1, 0, sizeof(*md_dst) + optslen - sizeof(*dst));
+ md_dst->type = type;
+}
+
+struct metadata_dst *metadata_dst_alloc(u8 optslen, enum metadata_type type,
+ gfp_t flags)
+{
+ struct metadata_dst *md_dst;
+
+ md_dst = kmalloc(sizeof(*md_dst) + optslen, flags);
+ if (!md_dst)
+ return NULL;
+
+ __metadata_dst_init(md_dst, type, optslen);
+
+ return md_dst;
+}
+EXPORT_SYMBOL_GPL(metadata_dst_alloc);
+
+void metadata_dst_free(struct metadata_dst *md_dst)
+{
+#ifdef CONFIG_DST_CACHE
+ if (md_dst->type == METADATA_IP_TUNNEL)
+ dst_cache_destroy(&md_dst->u.tun_info.dst_cache);
+#endif
+ kfree(md_dst);
+}
+EXPORT_SYMBOL_GPL(metadata_dst_free);
+
+struct metadata_dst __percpu *
+metadata_dst_alloc_percpu(u8 optslen, enum metadata_type type, gfp_t flags)
+{
+ int cpu;
+ struct metadata_dst __percpu *md_dst;
+
+ md_dst = __alloc_percpu_gfp(sizeof(struct metadata_dst) + optslen,
+ __alignof__(struct metadata_dst), flags);
+ if (!md_dst)
+ return NULL;
+
+ for_each_possible_cpu(cpu)
+ __metadata_dst_init(per_cpu_ptr(md_dst, cpu), type, optslen);
+
+ return md_dst;
+}
+EXPORT_SYMBOL_GPL(metadata_dst_alloc_percpu);
+
+void metadata_dst_free_percpu(struct metadata_dst __percpu *md_dst)
+{
+#ifdef CONFIG_DST_CACHE
+ int cpu;
+
+ for_each_possible_cpu(cpu) {
+ struct metadata_dst *one_md_dst = per_cpu_ptr(md_dst, cpu);
+
+ if (one_md_dst->type == METADATA_IP_TUNNEL)
+ dst_cache_destroy(&one_md_dst->u.tun_info.dst_cache);
+ }
+#endif
+ free_percpu(md_dst);
+}
+EXPORT_SYMBOL_GPL(metadata_dst_free_percpu);