RDMA/bnxt_re: Add support for querying HW contexts

Implements support for querying the hardware resource
contexts. This raw data can be used for the debugging
of the field issues.

Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Link: https://patch.msgid.link/1730428483-17841-3-git-send-email-selvin.xavier@broadcom.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>

drivers/infiniband/hw/bnxt_re/bnxt_re.h

@@ -247,4 +247,23 @@ static inline void bnxt_re_set_pacing_dev_state(struct bnxt_re_dev *rdev)
 	rdev->qplib_res.pacing_data->dev_err_state =
 		test_bit(BNXT_RE_FLAG_ERR_DEVICE_DETACHED, &rdev->flags);
 }
+
+static inline int bnxt_re_read_context_allowed(struct bnxt_re_dev *rdev)
+{
+	if (!bnxt_qplib_is_chip_gen_p5_p7(rdev->chip_ctx) ||
+	    rdev->rcfw.res->cctx->hwrm_intf_ver < HWRM_VERSION_READ_CTX)
+		return -EOPNOTSUPP;
+	return 0;
+}
+
+#define BNXT_RE_CONTEXT_TYPE_QPC_SIZE_P5	1088
+#define BNXT_RE_CONTEXT_TYPE_CQ_SIZE_P5		128
+#define BNXT_RE_CONTEXT_TYPE_MRW_SIZE_P5	128
+#define BNXT_RE_CONTEXT_TYPE_SRQ_SIZE_P5	192
+
+#define BNXT_RE_CONTEXT_TYPE_QPC_SIZE_P7	1088
+#define BNXT_RE_CONTEXT_TYPE_CQ_SIZE_P7		192
+#define BNXT_RE_CONTEXT_TYPE_MRW_SIZE_P7	192
+#define BNXT_RE_CONTEXT_TYPE_SRQ_SIZE_P7	192
+
 #endif

drivers/infiniband/hw/bnxt_re/qplib_rcfw.h

@@ -131,6 +131,8 @@ static inline u32 bnxt_qplib_set_cmd_slots(struct cmdq_base *req)
 #define RCFW_CMD_IS_BLOCKING		0x8000
 
 #define HWRM_VERSION_DEV_ATTR_MAX_DPI  0x1000A0000000DULL
+/* HWRM version 1.10.3.18 */
+#define HWRM_VERSION_READ_CTX           0x1000A00030012
 
 /* Crsq buf is 1024-Byte */
 struct bnxt_qplib_crsbe {

drivers/infiniband/hw/bnxt_re/qplib_sp.c

@@ -972,3 +972,38 @@ int bnxt_qplib_modify_cc(struct bnxt_qplib_res *res,
 	rc = bnxt_qplib_rcfw_send_message(res->rcfw, &msg);
 	return rc;
 }
+
+int bnxt_qplib_read_context(struct bnxt_qplib_rcfw *rcfw, u8 res_type,
+			    u32 xid, u32 resp_size, void *resp_va)
+{
+	struct creq_read_context resp = {};
+	struct bnxt_qplib_cmdqmsg msg = {};
+	struct cmdq_read_context req = {};
+	struct bnxt_qplib_rcfw_sbuf sbuf;
+	int rc;
+
+	sbuf.size = resp_size;
+	sbuf.sb = dma_alloc_coherent(&rcfw->pdev->dev, sbuf.size,
+				     &sbuf.dma_addr, GFP_KERNEL);
+	if (!sbuf.sb)
+		return -ENOMEM;
+
+	bnxt_qplib_rcfw_cmd_prep((struct cmdq_base *)&req,
+				 CMDQ_BASE_OPCODE_READ_CONTEXT, sizeof(req));
+	req.resp_addr = cpu_to_le64(sbuf.dma_addr);
+	req.resp_size = resp_size / BNXT_QPLIB_CMDQE_UNITS;
+
+	req.xid = cpu_to_le32(xid);
+	req.type = res_type;
+
+	bnxt_qplib_fill_cmdqmsg(&msg, &req, &resp, &sbuf, sizeof(req),
+				sizeof(resp), 0);
+	rc = bnxt_qplib_rcfw_send_message(rcfw, &msg);
+	if (rc)
+		goto free_mem;
+
+	memcpy(resp_va, sbuf.sb, resp_size);
+free_mem:
+	dma_free_coherent(&rcfw->pdev->dev, sbuf.size, sbuf.sb, sbuf.dma_addr);
+	return rc;
+}

drivers/infiniband/hw/bnxt_re/qplib_sp.h

@@ -352,6 +352,8 @@ int bnxt_qplib_qext_stat(struct bnxt_qplib_rcfw *rcfw, u32 fid,
 			 struct bnxt_qplib_ext_stat *estat);
 int bnxt_qplib_modify_cc(struct bnxt_qplib_res *res,
 			 struct bnxt_qplib_cc_param *cc_param);
+int bnxt_qplib_read_context(struct bnxt_qplib_rcfw *rcfw, u8 type, u32 xid,
+			    u32 resp_size, void *resp_va);
 
 #define BNXT_VAR_MAX_WQE       4352
 #define BNXT_VAR_MAX_SLOT_ALIGN 256

drivers/infiniband/hw/bnxt_re/roce_hsi.h

@@ -2265,6 +2265,46 @@ struct creq_set_func_resources_resp {
 	u8	reserved48[6];
 };
 
+/* cmdq_read_context (size:192b/24B) */
+struct cmdq_read_context {
+	u8	opcode;
+	#define CMDQ_READ_CONTEXT_OPCODE_READ_CONTEXT 0x85UL
+	#define CMDQ_READ_CONTEXT_OPCODE_LAST        CMDQ_READ_CONTEXT_OPCODE_READ_CONTEXT
+	u8	cmd_size;
+	__le16	flags;
+	__le16	cookie;
+	u8	resp_size;
+	u8	reserved8;
+	__le64	resp_addr;
+	__le32	xid;
+	u8	type;
+	#define CMDQ_READ_CONTEXT_TYPE_QPC 0x0UL
+	#define CMDQ_READ_CONTEXT_TYPE_CQ  0x1UL
+	#define CMDQ_READ_CONTEXT_TYPE_MRW 0x2UL
+	#define CMDQ_READ_CONTEXT_TYPE_SRQ 0x3UL
+	#define CMDQ_READ_CONTEXT_TYPE_LAST CMDQ_READ_CONTEXT_TYPE_SRQ
+	u8	unused_0[3];
+};
+
+/* creq_read_context (size:128b/16B) */
+struct creq_read_context {
+	u8	type;
+	#define CREQ_READ_CONTEXT_TYPE_MASK    0x3fUL
+	#define CREQ_READ_CONTEXT_TYPE_SFT     0
+	#define CREQ_READ_CONTEXT_TYPE_QP_EVENT  0x38UL
+	#define CREQ_READ_CONTEXT_TYPE_LAST     CREQ_READ_CONTEXT_TYPE_QP_EVENT
+	u8	status;
+	__le16	cookie;
+	__le32	reserved32;
+	u8	v;
+	#define CREQ_READ_CONTEXT_V     0x1UL
+	u8	event;
+	#define CREQ_READ_CONTEXT_EVENT_READ_CONTEXT 0x85UL
+	#define CREQ_READ_CONTEXT_EVENT_LAST        CREQ_READ_CONTEXT_EVENT_READ_CONTEXT
+	__le16	reserved16;
+	__le32	reserved_32;
+};
+
 /* cmdq_map_tc_to_cos (size:192b/24B) */
 struct cmdq_map_tc_to_cos {
 	u8	opcode;