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-rw-r--r--net/core/xdp.c73
1 files changed, 73 insertions, 0 deletions
diff --git a/net/core/xdp.c b/net/core/xdp.c
new file mode 100644
index 0000000..097a0f7
--- /dev/null
+++ b/net/core/xdp.c
@@ -0,0 +1,73 @@
+/* net/core/xdp.c
+ *
+ * Copyright (c) 2017 Jesper Dangaard Brouer, Red Hat Inc.
+ * Released under terms in GPL version 2. See COPYING.
+ */
+#include <linux/types.h>
+#include <linux/mm.h>
+
+#include <net/xdp.h>
+
+#define REG_STATE_NEW 0x0
+#define REG_STATE_REGISTERED 0x1
+#define REG_STATE_UNREGISTERED 0x2
+#define REG_STATE_UNUSED 0x3
+
+void xdp_rxq_info_unreg(struct xdp_rxq_info *xdp_rxq)
+{
+ /* Simplify driver cleanup code paths, allow unreg "unused" */
+ if (xdp_rxq->reg_state == REG_STATE_UNUSED)
+ return;
+
+ WARN(!(xdp_rxq->reg_state == REG_STATE_REGISTERED), "Driver BUG");
+
+ xdp_rxq->reg_state = REG_STATE_UNREGISTERED;
+ xdp_rxq->dev = NULL;
+}
+EXPORT_SYMBOL_GPL(xdp_rxq_info_unreg);
+
+static void xdp_rxq_info_init(struct xdp_rxq_info *xdp_rxq)
+{
+ memset(xdp_rxq, 0, sizeof(*xdp_rxq));
+}
+
+/* Returns 0 on success, negative on failure */
+int xdp_rxq_info_reg(struct xdp_rxq_info *xdp_rxq,
+ struct net_device *dev, u32 queue_index)
+{
+ if (xdp_rxq->reg_state == REG_STATE_UNUSED) {
+ WARN(1, "Driver promised not to register this");
+ return -EINVAL;
+ }
+
+ if (xdp_rxq->reg_state == REG_STATE_REGISTERED) {
+ WARN(1, "Missing unregister, handled but fix driver");
+ xdp_rxq_info_unreg(xdp_rxq);
+ }
+
+ if (!dev) {
+ WARN(1, "Missing net_device from driver");
+ return -ENODEV;
+ }
+
+ /* State either UNREGISTERED or NEW */
+ xdp_rxq_info_init(xdp_rxq);
+ xdp_rxq->dev = dev;
+ xdp_rxq->queue_index = queue_index;
+
+ xdp_rxq->reg_state = REG_STATE_REGISTERED;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(xdp_rxq_info_reg);
+
+void xdp_rxq_info_unused(struct xdp_rxq_info *xdp_rxq)
+{
+ xdp_rxq->reg_state = REG_STATE_UNUSED;
+}
+EXPORT_SYMBOL_GPL(xdp_rxq_info_unused);
+
+bool xdp_rxq_info_is_reg(struct xdp_rxq_info *xdp_rxq)
+{
+ return (xdp_rxq->reg_state == REG_STATE_REGISTERED);
+}
+EXPORT_SYMBOL_GPL(xdp_rxq_info_is_reg);
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