1 files changed, 76 insertions, 0 deletions
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_xdp.c b/drivers/net/ethernet/microchip/lan966x/lan966x_xdp.c
new file mode 100644
index 000000000000..e77d9f2aad2b
--- /dev/null
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_xdp.c
@@ -0,0 +1,76 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <linux/bpf.h>
+#include <linux/bpf_trace.h>
+#include <linux/filter.h>
+
+#include "lan966x_main.h"
+
+static int lan966x_xdp_setup(struct net_device *dev, struct netdev_bpf *xdp)
+{
+	struct lan966x_port *port = netdev_priv(dev);
+	struct lan966x *lan966x = port->lan966x;
+	struct bpf_prog *old_prog;
+
+	if (!lan966x->fdma) {
+		NL_SET_ERR_MSG_MOD(xdp->extack,
+				   "Allow to set xdp only when using fdma");
+		return -EOPNOTSUPP;
+	}
+
+	old_prog = xchg(&port->xdp_prog, xdp->prog);
+	if (old_prog)
+		bpf_prog_put(old_prog);
+
+	return 0;
+}
+
+int lan966x_xdp(struct net_device *dev, struct netdev_bpf *xdp)
+{
+	switch (xdp->command) {
+	case XDP_SETUP_PROG:
+		return lan966x_xdp_setup(dev, xdp);
+	default:
+		return -EINVAL;
+	}
+}
+
+int lan966x_xdp_run(struct lan966x_port *port, struct page *page, u32 data_len)
+{
+	struct bpf_prog *xdp_prog = port->xdp_prog;
+	struct lan966x *lan966x = port->lan966x;
+	struct xdp_buff xdp;
+	u32 act;
+
+	xdp_init_buff(&xdp, PAGE_SIZE << lan966x->rx.page_order,
+		      &port->xdp_rxq);
+	xdp_prepare_buff(&xdp, page_address(page), IFH_LEN_BYTES,
+			 data_len - IFH_LEN_BYTES, false);
+	act = bpf_prog_run_xdp(xdp_prog, &xdp);
+	switch (act) {
+	case XDP_PASS:
+		return FDMA_PASS;
+	default:
+		bpf_warn_invalid_xdp_action(port->dev, xdp_prog, act);
+		fallthrough;
+	case XDP_ABORTED:
+		trace_xdp_exception(port->dev, xdp_prog, act);
+		fallthrough;
+	case XDP_DROP:
+		return FDMA_DROP;
+	}
+}
+
+int lan966x_xdp_port_init(struct lan966x_port *port)
+{
+	struct lan966x *lan966x = port->lan966x;
+
+	return xdp_rxq_info_reg(&port->xdp_rxq, port->dev, 0,
+				lan966x->napi.napi_id);
+}
+
+void lan966x_xdp_port_deinit(struct lan966x_port *port)
+{
+	if (xdp_rxq_info_is_reg(&port->xdp_rxq))
+		xdp_rxq_info_unreg(&port->xdp_rxq);
+}