netdev - [PATCH rdma-next 8/9] RDMA/bnxt_re: Dump the HW context information

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Message-Id: <1740076496-14227-9-git-send-email-selvin.xavier@broadcom.com>
Date: Thu, 20 Feb 2025 10:34:55 -0800
From: Selvin Xavier <selvin.xavier@...adcom.com>
To: leon@...nel.org,
	jgg@...pe.ca
Cc: linux-rdma@...r.kernel.org,
	andrew.gospodarek@...adcom.com,
	kalesh-anakkur.purayil@...adcom.com,
	netdev@...r.kernel.org,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	abeni@...hat.com,
	horms@...nel.org,
	michael.chan@...adcom.com,
	Kashyap Desai <kashyap.desai@...adcom.com>,
	Selvin Xavier <selvin.xavier@...adcom.com>
Subject: [PATCH rdma-next 8/9] RDMA/bnxt_re: Dump the HW context information

From: Kashyap Desai <kashyap.desai@...adcom.com>

Dump the cached HW context information for QP/CQ/SRQ/MRs
when the L2 driver queries using get_dump_data

Signed-off-by: Kashyap Desai <kashyap.desai@...adcom.com>
Signed-off-by: Selvin Xavier <selvin.xavier@...adcom.com>
---
 drivers/infiniband/hw/bnxt_re/ib_verbs.c | 10 ++++-----
 drivers/infiniband/hw/bnxt_re/main.c     | 38 ++++++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+), 6 deletions(-)

diff --git a/drivers/infiniband/hw/bnxt_re/ib_verbs.c b/drivers/infiniband/hw/bnxt_re/ib_verbs.c
index a1ee6ca..dca435e 100644
--- a/drivers/infiniband/hw/bnxt_re/ib_verbs.c
+++ b/drivers/infiniband/hw/bnxt_re/ib_verbs.c
@@ -1079,7 +1079,7 @@ int bnxt_re_destroy_qp(struct ib_qp *ib_qp, struct ib_udata *udata)
 	struct bnxt_qplib_nq *rcq_nq = NULL;
 	unsigned int flags;
 	void  *ctx_sb_data = NULL;
-	bool do_snapdump;
+	bool do_snapdump = false;
 	u16 ctx_size;
 	int rc;
 
@@ -1087,17 +1087,15 @@ int bnxt_re_destroy_qp(struct ib_qp *ib_qp, struct ib_udata *udata)
 	bnxt_re_debug_rem_qpinfo(rdev, qp);
 
 	bnxt_qplib_flush_cqn_wq(&qp->qplib_qp);
-	ctx_size = qplib_qp->ctx_size_sb;
+	ctx_size = rdev->rcfw.qp_ctxm_size;
 	if (ctx_size)
 		ctx_sb_data = vzalloc(ctx_size);
-	do_snapdump = test_bit(QP_FLAGS_CAPTURE_SNAPDUMP, &qplib_qp->flags);
 
 	rc = bnxt_qplib_destroy_qp(&rdev->qplib_res, &qp->qplib_qp, ctx_size, ctx_sb_data);
 	if (rc)
 		ibdev_err(&rdev->ibdev, "Failed to destroy HW QP");
-	else
-		bnxt_re_save_resource_context(rdev, ctx_sb_data,
-					      BNXT_RE_RES_TYPE_QP, do_snapdump);
+	do_snapdump = test_bit(QP_FLAGS_CAPTURE_SNAPDUMP, &qplib_qp->flags);
+	bnxt_re_save_resource_context(rdev, ctx_sb_data,  BNXT_RE_RES_TYPE_QP, do_snapdump);
 
 	vfree(ctx_sb_data);
 	if (rdma_is_kernel_res(&qp->ib_qp.res)) {
diff --git a/drivers/infiniband/hw/bnxt_re/main.c b/drivers/infiniband/hw/bnxt_re/main.c
index afde0ef..b2bf0d0 100644
--- a/drivers/infiniband/hw/bnxt_re/main.c
+++ b/drivers/infiniband/hw/bnxt_re/main.c
@@ -506,6 +506,44 @@ static void bnxt_re_start_irq(void *handle, struct bnxt_msix_entry *ent)
 static void bnxt_re_dump_ctx(struct bnxt_re_dev *rdev, u32 seg_id, void *buf,
 			     u32 buf_len)
 {
+	int ctx_index, i;
+	void *ctx_data;
+	u16 ctx_size;
+
+	switch (seg_id) {
+	case BNXT_SEGMENT_QP_CTX:
+		ctx_data = rdev->rcfw.qp_ctxm_data;
+		ctx_size = rdev->rcfw.qp_ctxm_size;
+		ctx_index = rdev->rcfw.qp_ctxm_data_index;
+		break;
+	case BNXT_SEGMENT_CQ_CTX:
+		ctx_data = rdev->rcfw.cq_ctxm_data;
+		ctx_size = rdev->rcfw.cq_ctxm_size;
+		ctx_index = rdev->rcfw.cq_ctxm_data_index;
+		break;
+	case BNXT_SEGMENT_MR_CTX:
+		ctx_data = rdev->rcfw.mrw_ctxm_data;
+		ctx_size = rdev->rcfw.mrw_ctxm_size;
+		ctx_index = rdev->rcfw.mrw_ctxm_data_index;
+		break;
+	case BNXT_SEGMENT_SRQ_CTX:
+		ctx_data = rdev->rcfw.srq_ctxm_data;
+		ctx_size = rdev->rcfw.srq_ctxm_size;
+		ctx_index = rdev->rcfw.srq_ctxm_data_index;
+		break;
+	default:
+		return;
+	}
+
+	if (!ctx_data || (ctx_size * BNXT_RE_MAX_QDUMP_ENTRIES) > buf_len)
+		return;
+
+	for (i = ctx_index; i < BNXT_RE_MAX_QDUMP_ENTRIES + ctx_index; i++) {
+		memcpy(buf, ctx_data + ((i % BNXT_RE_MAX_QDUMP_ENTRIES) * ctx_size),
+		       ctx_size);
+		buf += ctx_size;
+	}
+
 }
 
 /*
-- 
2.5.5