net: Add generic packet offload infrastructure.
Create a new data structure to contain the GRO/GSO callbacks and add
a new registration mechanism.
Singed-off-by: Vlad Yasevich <vyasevic@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/dev.c b/net/core/dev.c
index 83232a1..6884f87 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -176,8 +176,10 @@
#define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
static DEFINE_SPINLOCK(ptype_lock);
+static DEFINE_SPINLOCK(offload_lock);
static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
static struct list_head ptype_all __read_mostly; /* Taps */
+static struct list_head offload_base __read_mostly;
/*
* The @dev_base_head list is protected by @dev_base_lock and the rtnl
@@ -470,6 +472,82 @@
}
EXPORT_SYMBOL(dev_remove_pack);
+
+/**
+ * dev_add_offload - register offload handlers
+ * @po: protocol offload declaration
+ *
+ * Add protocol offload handlers to the networking stack. The passed
+ * &proto_offload is linked into kernel lists and may not be freed until
+ * it has been removed from the kernel lists.
+ *
+ * This call does not sleep therefore it can not
+ * guarantee all CPU's that are in middle of receiving packets
+ * will see the new offload handlers (until the next received packet).
+ */
+void dev_add_offload(struct packet_offload *po)
+{
+ struct list_head *head = &offload_base;
+
+ spin_lock(&offload_lock);
+ list_add_rcu(&po->list, head);
+ spin_unlock(&offload_lock);
+}
+EXPORT_SYMBOL(dev_add_offload);
+
+/**
+ * __dev_remove_offload - remove offload handler
+ * @po: packet offload declaration
+ *
+ * Remove a protocol offload handler that was previously added to the
+ * kernel offload handlers by dev_add_offload(). The passed &offload_type
+ * is removed from the kernel lists and can be freed or reused once this
+ * function returns.
+ *
+ * The packet type might still be in use by receivers
+ * and must not be freed until after all the CPU's have gone
+ * through a quiescent state.
+ */
+void __dev_remove_offload(struct packet_offload *po)
+{
+ struct list_head *head = &offload_base;
+ struct packet_offload *po1;
+
+ spin_lock(&ptype_lock);
+
+ list_for_each_entry(po1, head, list) {
+ if (po == po1) {
+ list_del_rcu(&po->list);
+ goto out;
+ }
+ }
+
+ pr_warn("dev_remove_offload: %p not found\n", po);
+out:
+ spin_unlock(&ptype_lock);
+}
+EXPORT_SYMBOL(__dev_remove_offload);
+
+/**
+ * dev_remove_offload - remove packet offload handler
+ * @po: packet offload declaration
+ *
+ * Remove a packet offload handler that was previously added to the kernel
+ * offload handlers by dev_add_offload(). The passed &offload_type is
+ * removed from the kernel lists and can be freed or reused once this
+ * function returns.
+ *
+ * This call sleeps to guarantee that no CPU is looking at the packet
+ * type after return.
+ */
+void dev_remove_offload(struct packet_offload *po)
+{
+ __dev_remove_offload(po);
+
+ synchronize_net();
+}
+EXPORT_SYMBOL(dev_remove_offload);
+
/******************************************************************************
Device Boot-time Settings Routines
@@ -6661,6 +6739,8 @@
for (i = 0; i < PTYPE_HASH_SIZE; i++)
INIT_LIST_HEAD(&ptype_base[i]);
+ INIT_LIST_HEAD(&offload_base);
+
if (register_pernet_subsys(&netdev_net_ops))
goto out;
