nfp: add support for control messages for flower app

In preparation for adding a new flower app - targeted at offloading
the flower classifier - provide support for control message that it will
use to communicate with the NFP.

Based in part on work by Bert van Leeuwen.

Signed-off-by: Simon Horman <simon.horman@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 116 insertions, 0 deletions

diff --git a/drivers/net/ethernet/netronome/nfp/flower/cmsg.h b/drivers/net/ethernet/netronome/nfp/flower/cmsg.h
new file mode 100644
index 000000000000..2eeddada7f4d
--- /dev/null
+++ b/drivers/net/ethernet/netronome/nfp/flower/cmsg.h
@@ -0,0 +1,116 @@
+/*
+ * Copyright (C) 2017 Netronome Systems, Inc.
+ *
+ * This software is dual licensed under the GNU General License Version 2,
+ * June 1991 as shown in the file COPYING in the top-level directory of this
+ * source tree or the BSD 2-Clause License provided below.  You have the
+ * option to license this software under the complete terms of either license.
+ *
+ * The BSD 2-Clause License:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      1. Redistributions of source code must retain the above
+ *         copyright notice, this list of conditions and the following
+ *         disclaimer.
+ *
+ *      2. Redistributions in binary form must reproduce the above
+ *         copyright notice, this list of conditions and the following
+ *         disclaimer in the documentation and/or other materials
+ *         provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef NFP_FLOWER_CMSG_H
+#define NFP_FLOWER_CMSG_H
+
+#include <linux/bitfield.h>
+#include <linux/skbuff.h>
+#include <linux/types.h>
+
+#include "../nfp_app.h"
+
+/* The base header for a control message packet.
+ * Defines an 8-bit version, and an 8-bit type, padded
+ * to a 32-bit word. Rest of the packet is type-specific.
+ */
+struct nfp_flower_cmsg_hdr {
+	__be16 pad;
+	u8 type;
+	u8 version;
+};
+
+#define NFP_FLOWER_CMSG_HLEN		sizeof(struct nfp_flower_cmsg_hdr)
+#define NFP_FLOWER_CMSG_VER1		1
+
+/* Types defined for port related control messages  */
+enum nfp_flower_cmsg_type_port {
+	NFP_FLOWER_CMSG_TYPE_PORT_MOD =		8,
+	NFP_FLOWER_CMSG_TYPE_PORT_ECHO =	16,
+	NFP_FLOWER_CMSG_TYPE_MAX =		32,
+};
+
+/* NFP_FLOWER_CMSG_TYPE_PORT_MOD */
+struct nfp_flower_cmsg_portmod {
+	__be32 portnum;
+	u8 reserved;
+	u8 info;
+	__be16 mtu;
+};
+
+#define NFP_FLOWER_CMSG_PORTMOD_INFO_LINK	BIT(0)
+
+enum nfp_flower_cmsg_port_type {
+	NFP_FLOWER_CMSG_PORT_TYPE_UNSPEC =	0x0,
+	NFP_FLOWER_CMSG_PORT_TYPE_PHYS_PORT =	0x1,
+	NFP_FLOWER_CMSG_PORT_TYPE_PCIE_PORT =	0x2,
+};
+
+enum nfp_flower_cmsg_port_vnic_type {
+	NFP_FLOWER_CMSG_PORT_VNIC_TYPE_VF =	0x0,
+	NFP_FLOWER_CMSG_PORT_VNIC_TYPE_PF =	0x1,
+	NFP_FLOWER_CMSG_PORT_VNIC_TYPE_CTRL =	0x2,
+};
+
+#define NFP_FLOWER_CMSG_PORT_TYPE		GENMASK(31, 28)
+#define NFP_FLOWER_CMSG_PORT_SYS_ID		GENMASK(27, 24)
+#define NFP_FLOWER_CMSG_PORT_NFP_ID		GENMASK(23, 22)
+#define NFP_FLOWER_CMSG_PORT_PCI		GENMASK(15, 14)
+#define NFP_FLOWER_CMSG_PORT_VNIC_TYPE		GENMASK(13, 12)
+#define NFP_FLOWER_CMSG_PORT_VNIC		GENMASK(11, 6)
+#define NFP_FLOWER_CMSG_PORT_PCIE_Q		GENMASK(5, 0)
+#define NFP_FLOWER_CMSG_PORT_PHYS_PORT_NUM	GENMASK(7, 0)
+
+static inline u32 nfp_flower_cmsg_phys_port(u8 phys_port)
+{
+	return FIELD_PREP(NFP_FLOWER_CMSG_PORT_PHYS_PORT_NUM, phys_port) |
+		FIELD_PREP(NFP_FLOWER_CMSG_PORT_TYPE,
+			   NFP_FLOWER_CMSG_PORT_TYPE_PHYS_PORT);
+}
+
+static inline u32
+nfp_flower_cmsg_pcie_port(u8 nfp_pcie, enum nfp_flower_cmsg_port_vnic_type type,
+			  u8 vnic, u8 q)
+{
+	return FIELD_PREP(NFP_FLOWER_CMSG_PORT_PCI, nfp_pcie) |
+		FIELD_PREP(NFP_FLOWER_CMSG_PORT_VNIC_TYPE, type) |
+		FIELD_PREP(NFP_FLOWER_CMSG_PORT_VNIC, vnic) |
+		FIELD_PREP(NFP_FLOWER_CMSG_PORT_PCIE_Q, q) |
+		FIELD_PREP(NFP_FLOWER_CMSG_PORT_TYPE,
+			   NFP_FLOWER_CMSG_PORT_TYPE_PCIE_PORT);
+}
+
+int nfp_flower_cmsg_portmod(struct net_device *netdev, bool carrier_ok);
+void nfp_flower_cmsg_rx(struct nfp_app *app, struct sk_buff *skb);
+
+#endif