compat: Backport IPv4 reassembly.

[cascardo/ovs.git] / datapath / linux / compat / include / net / inet_frag.h

diff --git a/datapath/linux/compat/include/net/inet_frag.h b/datapath/linux/compat/include/net/inet_frag.h
index 6767c31..6e98ebc 100644 (file)
--- a/datapath/linux/compat/include/net/inet_frag.h
+++ b/datapath/linux/compat/include/net/inet_frag.h
@@ -13,4 +13,61 @@
        } while (0)
 #endif
 
+#ifdef OVS_FRAGMENT_BACKPORT
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,17,0)
+#define q_flags(q) (q->last_in)
+#define qp_flags(qp) (qp->q.last_in)
+#else
+#define q_flags(q) (q->flags)
+#define qp_flags(qp) (qp->q.flags)
+#endif
+
+/**
+ * struct ovs_inet_frag_queue - fragment queue
+ *
+ * Wrap the system inet_frag_queue to provide a list evictor.
+ *
+ * @list_evictor: list of queues to forcefully evict (e.g. due to low memory)
+ */
+struct ovs_inet_frag_queue {
+       struct inet_frag_queue  fq;
+       struct hlist_node       list_evictor;
+};
+
+static inline bool rpl_inet_frag_evicting(struct inet_frag_queue *q)
+{
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,17,0)
+       return (q_flags(q) & INET_FRAG_FIRST_IN) && q->fragments != NULL;
+#else
+       struct ovs_inet_frag_queue *ofq = (struct ovs_inet_frag_queue *)q;
+       return !hlist_unhashed(&ofq->list_evictor);
+#endif
+}
+#define inet_frag_evicting rpl_inet_frag_evicting
+
+static unsigned int rpl_frag_percpu_counter_batch = 130000;
+#define frag_percpu_counter_batch rpl_frag_percpu_counter_batch
+
+static inline void rpl_sub_frag_mem_limit(struct netns_frags *nf, int i)
+{
+       __percpu_counter_add(&nf->mem, -i, frag_percpu_counter_batch);
+}
+#define sub_frag_mem_limit rpl_sub_frag_mem_limit
+
+static inline void rpl_add_frag_mem_limit(struct netns_frags *nf, int i)
+{
+       __percpu_counter_add(&nf->mem, i, frag_percpu_counter_batch);
+}
+#define add_frag_mem_limit rpl_add_frag_mem_limit
+
+int rpl_inet_frags_init(struct inet_frags *f);
+#define inet_frags_init rpl_inet_frags_init
+
+void rpl_inet_frags_exit_net(struct netns_frags *nf, struct inet_frags *f);
+#define inet_frags_exit_net rpl_inet_frags_exit_net
+
+void rpl_inet_frag_destroy(struct inet_frag_queue *q, struct inet_frags *f);
+#define inet_frag_destroy(q, f, work) rpl_inet_frag_destroy(q, f)
+#endif /* OVS_FRAGMENT_BACKPORT */
+
 #endif /* inet_frag.h */