--- /dev/null
+/*
+ * Copyright (C) 2018 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.
+ */
+
+#include <linux/bitfield.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+
+#include "nfp_net_ctrl.h"
+#include "nfp_net.h"
+
+static void nfp_net_tlv_caps_reset(struct nfp_net_tlv_caps *caps)
+{
+ memset(caps, 0, sizeof(*caps));
+}
+
+int nfp_net_tlv_caps_parse(struct device *dev, u8 __iomem *ctrl_mem,
+ struct nfp_net_tlv_caps *caps)
+{
+ u8 __iomem *data = ctrl_mem + NFP_NET_CFG_TLV_BASE;
+ u8 __iomem *end = ctrl_mem + NFP_NET_CFG_BAR_SZ;
+ u32 hdr;
+
+ nfp_net_tlv_caps_reset(caps);
+
+ hdr = readl(data);
+ if (!hdr)
+ return 0;
+
+ while (true) {
+ unsigned int length, offset;
+ u32 hdr = readl(data);
+
+ length = FIELD_GET(NFP_NET_CFG_TLV_HEADER_LENGTH, hdr);
+ offset = data - ctrl_mem + NFP_NET_CFG_TLV_BASE;
+
+ /* Advance past the header */
+ data += 4;
+
+ if (length % NFP_NET_CFG_TLV_LENGTH_INC) {
+ dev_err(dev, "TLV size not multiple of %u len:%u\n",
+ NFP_NET_CFG_TLV_LENGTH_INC, length);
+ return -EINVAL;
+ }
+ if (data + length > end) {
+ dev_err(dev, "oversized TLV offset:%u len:%u\n",
+ offset, length);
+ return -EINVAL;
+ }
+
+ switch (FIELD_GET(NFP_NET_CFG_TLV_HEADER_TYPE, hdr)) {
+ case NFP_NET_CFG_TLV_TYPE_UNKNOWN:
+ dev_err(dev, "NULL TLV at offset:%u\n", offset);
+ return -EINVAL;
+ case NFP_NET_CFG_TLV_TYPE_RESERVED:
+ break;
+ case NFP_NET_CFG_TLV_TYPE_END:
+ if (!length)
+ return 0;
+
+ dev_err(dev, "END TLV should be empty, has len:%d\n",
+ length);
+ return -EINVAL;
+ default:
+ if (!FIELD_GET(NFP_NET_CFG_TLV_HEADER_REQUIRED, hdr))
+ break;
+
+ dev_err(dev, "unknown TLV type:%u offset:%u len:%u\n",
+ FIELD_GET(NFP_NET_CFG_TLV_HEADER_TYPE, hdr),
+ offset, length);
+ return -EINVAL;
+ }
+
+ data += length;
+ if (data + 4 > end) {
+ dev_err(dev, "reached end of BAR without END TLV\n");
+ return -EINVAL;
+ }
+ }
+
+ /* Not reached */
+ return -EINVAL;
+}
#ifndef _NFP_NET_CTRL_H_
#define _NFP_NET_CTRL_H_
-/* IMPORTANT: This header file is shared with the FW,
- * no OS specific constructs, please!
- */
+#include <linux/types.h>
/**
* Configuration BAR size.
#define NFP_NET_CFG_RSS_CAP 0x0054
#define NFP_NET_CFG_RSS_CAP_HFUNC 0xff000000
+/**
+ * TLV area start
+ * %NFP_NET_CFG_TLV_BASE: start anchor of the TLV area
+ */
+#define NFP_NET_CFG_TLV_BASE 0x0058
+
/**
* VXLAN/UDP encap configuration
* %NFP_NET_CFG_VXLAN_PORT: Base address of table of tunnels' UDP dst ports
#define NFP_NET_CFG_VLAN_FILTER_PROTO (NFP_NET_CFG_VLAN_FILTER + 2)
#define NFP_NET_CFG_VLAN_FILTER_SZ 0x0004
+/**
+ * TLV capabilities
+ * %NFP_NET_CFG_TLV_TYPE: Offset of type within the TLV
+ * %NFP_NET_CFG_TLV_TYPE_REQUIRED: Driver must be able to parse the TLV
+ * %NFP_NET_CFG_TLV_LENGTH: Offset of length within the TLV
+ * %NFP_NET_CFG_TLV_LENGTH_INC: TLV length increments
+ * %NFP_NET_CFG_TLV_VALUE: Offset of value with the TLV
+ *
+ * List of simple TLV structures, first one starts at %NFP_NET_CFG_TLV_BASE.
+ * Last structure must be of type %NFP_NET_CFG_TLV_TYPE_END. Presence of TLVs
+ * is indicated by %NFP_NET_CFG_TLV_BASE being non-zero. TLV structures may
+ * fill the entire remainder of the BAR or be shorter. FW must make sure TLVs
+ * don't conflict with other features which allocate space beyond
+ * %NFP_NET_CFG_TLV_BASE. %NFP_NET_CFG_TLV_TYPE_RESERVED should be used to wrap
+ * space used by such features.
+ * Note that the 4 byte TLV header is not counted in %NFP_NET_CFG_TLV_LENGTH.
+ */
+#define NFP_NET_CFG_TLV_TYPE 0x00
+#define NFP_NET_CFG_TLV_TYPE_REQUIRED 0x8000
+#define NFP_NET_CFG_TLV_LENGTH 0x02
+#define NFP_NET_CFG_TLV_LENGTH_INC 4
+#define NFP_NET_CFG_TLV_VALUE 0x04
+
+#define NFP_NET_CFG_TLV_HEADER_REQUIRED 0x80000000
+#define NFP_NET_CFG_TLV_HEADER_TYPE 0x7fff0000
+#define NFP_NET_CFG_TLV_HEADER_LENGTH 0x0000ffff
+
+/**
+ * Capability TLV types
+ *
+ * %NFP_NET_CFG_TLV_TYPE_UNKNOWN:
+ * Special TLV type to catch bugs, should never be encountered. Drivers should
+ * treat encountering this type as error and refuse to probe.
+ *
+ * %NFP_NET_CFG_TLV_TYPE_RESERVED:
+ * Reserved space, may contain legacy fixed-offset fields, or be used for
+ * padding. The use of this type should be otherwise avoided.
+ *
+ * %NFP_NET_CFG_TLV_TYPE_END:
+ * Empty, end of TLV list. Must be the last TLV. Drivers will stop processing
+ * further TLVs when encountered.
+ */
+#define NFP_NET_CFG_TLV_TYPE_UNKNOWN 0
+#define NFP_NET_CFG_TLV_TYPE_RESERVED 1
+#define NFP_NET_CFG_TLV_TYPE_END 2
+
+struct device;
+
+/**
+ * struct nfp_net_tlv_caps - parsed control BAR TLV capabilities
+ */
+struct nfp_net_tlv_caps {
+};
+
+int nfp_net_tlv_caps_parse(struct device *dev, u8 __iomem *ctrl_mem,
+ struct nfp_net_tlv_caps *caps);
+
#endif /* _NFP_NET_CTRL_H_ */
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