[dpdk-dev] [PATCH v2 30/34] net/bnxt: add support for rte flow flush driver hook

[Venkat Duvvuru <venkatkumar.duvvuru@broadcom.com>]

From: Kishore Padmanabha <kishore.padmanabha@broadcom.com>

This patch does the following
1. Gets the ulp session information from eth_dev
2. Fetches the rte_flow table associated with this session
3. Iterates through all the flows in the flow table
4. Calls ulp_mapper_resources_free which releases the key & action
   tables associated with each flow

Signed-off-by: Kishore Padmanabha <kishore.padmanabha@broadcom.com>
Signed-off-by: Venkat Duvvuru <venkatkumar.duvvuru@broadcom.com>
Reviewed-by: Lance Richardson <lance.richardson@broadcom.com>
Reviewed-by: Ajit Kumar Khaparde <ajit.khaparde@broadcom.com>
---
 drivers/net/bnxt/tf_ulp/bnxt_ulp.c      |  3 ++
 drivers/net/bnxt/tf_ulp/bnxt_ulp_flow.c | 33 +++++++++++++++-
 drivers/net/bnxt/tf_ulp/ulp_flow_db.c   | 69 +++++++++++++++++++++++++++++++++
 drivers/net/bnxt/tf_ulp/ulp_flow_db.h   | 11 ++++++
 4 files changed, 115 insertions(+), 1 deletion(-)

diff --git a/drivers/net/bnxt/tf_ulp/bnxt_ulp.c b/drivers/net/bnxt/tf_ulp/bnxt_ulp.c
index 3795c6d..56e08f2 100644
--- a/drivers/net/bnxt/tf_ulp/bnxt_ulp.c
+++ b/drivers/net/bnxt/tf_ulp/bnxt_ulp.c
@@ -517,6 +517,9 @@ bnxt_ulp_deinit(struct bnxt *bp)
 	if (!session)
 		return;
 
+	/* clean up regular flows */
+	ulp_flow_db_flush_flows(&bp->ulp_ctx, BNXT_ULP_REGULAR_FLOW_TABLE);
+
 	/* cleanup the eem table scope */
 	ulp_eem_tbl_scope_deinit(bp, &bp->ulp_ctx);
 
diff --git a/drivers/net/bnxt/tf_ulp/bnxt_ulp_flow.c b/drivers/net/bnxt/tf_ulp/bnxt_ulp_flow.c
index 35099a3..4958895 100644
--- a/drivers/net/bnxt/tf_ulp/bnxt_ulp_flow.c
+++ b/drivers/net/bnxt/tf_ulp/bnxt_ulp_flow.c
@@ -262,11 +262,42 @@ bnxt_ulp_flow_destroy(struct rte_eth_dev *dev,
 	return ret;
 }
 
+/* Function to destroy the rte flows. */
+static int32_t
+bnxt_ulp_flow_flush(struct rte_eth_dev *eth_dev,
+		    struct rte_flow_error *error)
+{
+	struct bnxt_ulp_context *ulp_ctx;
+	int32_t ret;
+	struct bnxt *bp;
+
+	ulp_ctx = bnxt_ulp_eth_dev_ptr2_cntxt_get(eth_dev);
+	if (!ulp_ctx) {
+		BNXT_TF_DBG(ERR, "ULP context is not initialized\n");
+		rte_flow_error_set(error, EINVAL,
+				   RTE_FLOW_ERROR_TYPE_HANDLE, NULL,
+				   "Failed to flush flow.");
+		return -EINVAL;
+	}
+	bp = eth_dev->data->dev_private;
+
+	/* Free the resources for the last device */
+	if (!ulp_ctx_deinit_allowed(bp))
+		return 0;
+
+	ret = ulp_flow_db_flush_flows(ulp_ctx, BNXT_ULP_REGULAR_FLOW_TABLE);
+	if (ret)
+		rte_flow_error_set(error, ret,
+				   RTE_FLOW_ERROR_TYPE_HANDLE, NULL,
+				   "Failed to flush flow.");
+	return ret;
+}
+
 const struct rte_flow_ops bnxt_ulp_rte_flow_ops = {
 	.validate = bnxt_ulp_flow_validate,
 	.create = bnxt_ulp_flow_create,
 	.destroy = bnxt_ulp_flow_destroy,
-	.flush = NULL,
+	.flush = bnxt_ulp_flow_flush,
 	.query = NULL,
 	.isolate = NULL
 };
diff --git a/drivers/net/bnxt/tf_ulp/ulp_flow_db.c b/drivers/net/bnxt/tf_ulp/ulp_flow_db.c
index 76ec856..68ba6d4 100644
--- a/drivers/net/bnxt/tf_ulp/ulp_flow_db.c
+++ b/drivers/net/bnxt/tf_ulp/ulp_flow_db.c
@@ -555,3 +555,72 @@ int32_t	ulp_flow_db_fid_free(struct bnxt_ulp_context		*ulp_ctxt,
 	/* all good, return success */
 	return 0;
 }
+
+/** Get the flow database entry iteratively
+ *
+ * flow_tbl [in] Ptr to flow table
+ * fid [in/out] The index to the flow entry
+ *
+ * returns 0 on success and negative on failure.
+ */
+static int32_t
+ulp_flow_db_next_entry_get(struct bnxt_ulp_flow_tbl	*flowtbl,
+			   uint32_t			*fid)
+{
+	uint32_t	lfid = *fid;
+	uint32_t	idx;
+	uint64_t	bs;
+
+	do {
+		lfid++;
+		if (lfid >= flowtbl->num_flows)
+			return -ENOENT;
+		idx = lfid / ULP_INDEX_BITMAP_SIZE;
+		while (!(bs = flowtbl->active_flow_tbl[idx])) {
+			idx++;
+			if ((idx * ULP_INDEX_BITMAP_SIZE) >= flowtbl->num_flows)
+				return -ENOENT;
+		}
+		lfid = (idx * ULP_INDEX_BITMAP_SIZE) + __builtin_clzl(bs);
+		if (*fid >= lfid) {
+			BNXT_TF_DBG(ERR, "Flow Database is corrupt\n");
+			return -ENOENT;
+		}
+	} while (!ulp_flow_db_active_flow_is_set(flowtbl, lfid));
+
+	/* all good, return success */
+	*fid = lfid;
+	return 0;
+}
+
+/*
+ * Flush all flows in the flow database.
+ *
+ * ulp_ctxt [in] Ptr to ulp context
+ * tbl_idx [in] The index to table
+ *
+ * returns 0 on success or negative number on failure
+ */
+int32_t	ulp_flow_db_flush_flows(struct bnxt_ulp_context *ulp_ctx,
+				uint32_t		idx)
+{
+	uint32_t			fid = 0;
+	struct bnxt_ulp_flow_db		*flow_db;
+	struct bnxt_ulp_flow_tbl	*flow_tbl;
+
+	if (!ulp_ctx) {
+		BNXT_TF_DBG(ERR, "Invalid Argument\n");
+		return -EINVAL;
+	}
+
+	flow_db = bnxt_ulp_cntxt_ptr2_flow_db_get(ulp_ctx);
+	if (!flow_db) {
+		BNXT_TF_DBG(ERR, "Flow database not found\n");
+		return -EINVAL;
+	}
+	flow_tbl = &flow_db->flow_tbl[idx];
+	while (!ulp_flow_db_next_entry_get(flow_tbl, &fid))
+		(void)ulp_mapper_resources_free(ulp_ctx, fid, idx);
+
+	return 0;
+}
diff --git a/drivers/net/bnxt/tf_ulp/ulp_flow_db.h b/drivers/net/bnxt/tf_ulp/ulp_flow_db.h
index eb5effa..5435415 100644
--- a/drivers/net/bnxt/tf_ulp/ulp_flow_db.h
+++ b/drivers/net/bnxt/tf_ulp/ulp_flow_db.h
@@ -142,4 +142,15 @@ int32_t	ulp_flow_db_fid_free(struct bnxt_ulp_context		*ulp_ctxt,
 			     enum bnxt_ulp_flow_db_tables	tbl_idx,
 			     uint32_t				fid);
 
+/*
+ * Flush all flows in the flow database.
+ *
+ * ulp_ctxt [in] Ptr to ulp context
+ * tbl_idx [in] The index to table
+ *
+ * returns 0 on success or negative number on failure
+ */
+int32_t	ulp_flow_db_flush_flows(struct bnxt_ulp_context *ulp_ctx,
+				uint32_t		idx);
+
 #endif /* _ULP_FLOW_DB_H_ */
-- 
2.7.4