RDMA/bnxt_re: RoCE slow path TLV support

Header file to support  TLV encapsulated commands. These
functions will be used by the driver in the follow up patches.
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Link: https://lore.kernel.org/r/1680169540-10029-6-git-send-email-selvin.xavier@broadcom.comSigned-off-by: Leon Romanovsky <leon@kernel.org>

drivers/infiniband/hw/bnxt_re/qplib_tlv.h

+/* SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause */
+
+#ifndef __QPLIB_TLV_H__
+#define __QPLIB_TLV_H__
+
+struct roce_tlv {
+	struct tlv tlv;
+	u8 total_size; // in units of 16 byte chunks
+	u8 unused[7];  // for 16 byte alignment
+};
+
+#define CHUNK_SIZE 16
+#define CHUNKS(x) (((x) + CHUNK_SIZE - 1) / CHUNK_SIZE)
+
+static inline  void __roce_1st_tlv_prep(struct roce_tlv *rtlv, u8 tot_chunks,
+					u16 content_bytes, u8 flags)
+{
+	rtlv->tlv.cmd_discr = cpu_to_le16(CMD_DISCR_TLV_ENCAP);
+	rtlv->tlv.tlv_type = cpu_to_le16(TLV_TYPE_ROCE_SP_COMMAND);
+	rtlv->tlv.length = cpu_to_le16(content_bytes);
+	rtlv->tlv.flags = TLV_FLAGS_REQUIRED;
+	rtlv->tlv.flags |= flags ? TLV_FLAGS_MORE : 0;
+	rtlv->total_size = (tot_chunks);
+}
+
+static inline void __roce_ext_tlv_prep(struct roce_tlv *rtlv, u16 tlv_type,
+				       u16 content_bytes, u8 more, u8 flags)
+{
+	rtlv->tlv.cmd_discr = cpu_to_le16(CMD_DISCR_TLV_ENCAP);
+	rtlv->tlv.tlv_type = cpu_to_le16(tlv_type);
+	rtlv->tlv.length = cpu_to_le16(content_bytes);
+	rtlv->tlv.flags |= more ? TLV_FLAGS_MORE : 0;
+	rtlv->tlv.flags |= flags ? TLV_FLAGS_REQUIRED : 0;
+}
+
+/*
+ * TLV size in units of 16 byte chunks
+ */
+#define TLV_SIZE ((sizeof(struct roce_tlv) + 15) / 16)
+/*
+ * TLV length in bytes
+ */
+#define TLV_BYTES (TLV_SIZE * 16)
+
+#define HAS_TLV_HEADER(msg) (le16_to_cpu(((struct tlv *)(msg))->cmd_discr) == CMD_DISCR_TLV_ENCAP)
+#define GET_TLV_DATA(tlv)   ((void *)&((uint8_t *)(tlv))[TLV_BYTES])
+
+static inline u8 __get_cmdq_base_opcode(struct cmdq_base *req, u32 size)
+{
+	if (HAS_TLV_HEADER(req) && size > TLV_BYTES)
+		return ((struct cmdq_base *)GET_TLV_DATA(req))->opcode;
+	else
+		return req->opcode;
+}
+
+static inline void __set_cmdq_base_opcode(struct cmdq_base *req,
+					  u32 size, u8 val)
+{
+	if (HAS_TLV_HEADER(req) && size > TLV_BYTES)
+		((struct cmdq_base *)GET_TLV_DATA(req))->opcode = val;
+	else
+		req->opcode = val;
+}
+
+static inline __le16 __get_cmdq_base_cookie(struct cmdq_base *req, u32 size)
+{
+	if (HAS_TLV_HEADER(req) && size > TLV_BYTES)
+		return ((struct cmdq_base *)GET_TLV_DATA(req))->cookie;
+	else
+		return req->cookie;
+}
+
+static inline void __set_cmdq_base_cookie(struct cmdq_base *req,
+					  u32 size, __le16 val)
+{
+	if (HAS_TLV_HEADER(req) && size > TLV_BYTES)
+		((struct cmdq_base *)GET_TLV_DATA(req))->cookie = val;
+	else
+		req->cookie = val;
+}
+
+static inline __le64 __get_cmdq_base_resp_addr(struct cmdq_base *req, u32 size)
+{
+	if (HAS_TLV_HEADER(req) && size > TLV_BYTES)
+		return ((struct cmdq_base *)GET_TLV_DATA(req))->resp_addr;
+	else
+		return req->resp_addr;
+}
+
+static inline void __set_cmdq_base_resp_addr(struct cmdq_base *req,
+					     u32 size, __le64 val)
+{
+	if (HAS_TLV_HEADER(req) && size > TLV_BYTES)
+		((struct cmdq_base *)GET_TLV_DATA(req))->resp_addr = val;
+	else
+		req->resp_addr = val;
+}
+
+static inline u8 __get_cmdq_base_resp_size(struct cmdq_base *req, u32 size)
+{
+	if (HAS_TLV_HEADER(req) && size > TLV_BYTES)
+		return ((struct cmdq_base *)GET_TLV_DATA(req))->resp_size;
+	else
+		return req->resp_size;
+}
+
+static inline void __set_cmdq_base_resp_size(struct cmdq_base *req,
+					     u32 size, u8 val)
+{
+	if (HAS_TLV_HEADER(req) && size > TLV_BYTES)
+		((struct cmdq_base *)GET_TLV_DATA(req))->resp_size = val;
+	else
+		req->resp_size = val;
+}
+
+static inline u8 __get_cmdq_base_cmd_size(struct cmdq_base *req, u32 size)
+{
+	if (HAS_TLV_HEADER(req) && size > TLV_BYTES)
+		return ((struct roce_tlv *)(req))->total_size;
+	else
+		return req->cmd_size;
+}
+
+static inline void __set_cmdq_base_cmd_size(struct cmdq_base *req,
+					    u32 size, u8 val)
+{
+	if (HAS_TLV_HEADER(req) && size > TLV_BYTES)
+		((struct cmdq_base *)GET_TLV_DATA(req))->cmd_size = val;
+	else
+		req->cmd_size = val;
+}
+
+static inline __le16 __get_cmdq_base_flags(struct cmdq_base *req, u32 size)
+{
+	if (HAS_TLV_HEADER(req) && size > TLV_BYTES)
+		return ((struct cmdq_base *)GET_TLV_DATA(req))->flags;
+	else
+		return req->flags;
+}
+
+static inline void __set_cmdq_base_flags(struct cmdq_base *req,
+					 u32 size, __le16 val)
+{
+	if (HAS_TLV_HEADER(req) && size > TLV_BYTES)
+		((struct cmdq_base *)GET_TLV_DATA(req))->flags = val;
+	else
+		req->flags = val;
+}
+
+struct bnxt_qplib_tlv_modify_cc_req {
+	struct roce_tlv				tlv_hdr;
+	struct cmdq_modify_roce_cc		base_req;
+	__le64					tlvpad;
+	struct cmdq_modify_roce_cc_gen1_tlv	ext_req;
+};
+
+struct bnxt_qplib_tlv_query_rcc_sb {
+	struct roce_tlv					tlv_hdr;
+	struct creq_query_roce_cc_resp_sb		base_sb;
+	struct creq_query_roce_cc_gen1_resp_sb_tlv	gen1_sb;
+};
+#endif /* __QPLIB_TLV_H__ */