[dpdk-dev] [PATCH v3 5/7] net/bnxt: fix to reuse an L2 filter

[Ajit Khaparde <ajit.khaparde@broadcom.com>]

From: Somnath Kotur <somnath.kotur@broadcom.com>

The software L2 filter was being released back to the free pool,
though it was created in HW and the filter corresponding to an actual
'flow' would have reference to the HW L2 filter.
But if this 'flow were to be deleted, then this HW L2 filter also
would be gone.
Fix this by storing the L2 filter created originally either for an
n-tuple flow or otherwise as part of the vnic's filter list.
This would require the filter_info struct to have a backptr to the
vnic which it came from.
Now that L2 filters can be re-used for an n-tuple filter(s), delete
L2 filter as well so the reference count of an L2 filter (if reused)
can be decremented appropriately.

Fixes: 5c1171c97216 ("net/bnxt: refactor filter/flow")
Cc: stable@dpdk.org

Signed-off-by: Somnath Kotur <somnath.kotur@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
---
 drivers/net/bnxt/bnxt_filter.h |  4 ++++
 drivers/net/bnxt/bnxt_flow.c   | 20 +++++++++-----------
 drivers/net/bnxt/bnxt_hwrm.c   | 20 +++++++++++++++-----
 3 files changed, 28 insertions(+), 16 deletions(-)

diff --git a/drivers/net/bnxt/bnxt_filter.h b/drivers/net/bnxt/bnxt_filter.h
index 9db3e7487..fc40f112b 100644
--- a/drivers/net/bnxt/bnxt_filter.h
+++ b/drivers/net/bnxt/bnxt_filter.h
@@ -77,6 +77,10 @@ struct bnxt_filter_info {
 	uint16_t                ip_addr_type;
 	uint16_t                ethertype;
 	uint32_t		priority;
+	/* Backptr to vnic. As of now, used only by an L2 filter
+	 * to remember which vnic it was created on
+	 */
+	struct			bnxt_vnic_info *vnic;
 };
 
 struct bnxt_filter_info *bnxt_alloc_filter(struct bnxt *bp);
diff --git a/drivers/net/bnxt/bnxt_flow.c b/drivers/net/bnxt/bnxt_flow.c
index 855994a6b..2bd492ea3 100644
--- a/drivers/net/bnxt/bnxt_flow.c
+++ b/drivers/net/bnxt/bnxt_flow.c
@@ -746,10 +746,9 @@ bnxt_find_matching_l2_filter(struct bnxt *bp, struct bnxt_filter_info *nf)
 {
 	struct bnxt_filter_info *mf, *f0;
 	struct bnxt_vnic_info *vnic0;
-	struct rte_flow *flow;
 	int i;
 
-	vnic0 = &bp->vnic_info[0];
+	vnic0 = BNXT_GET_DEFAULT_VNIC(bp);
 	f0 = STAILQ_FIRST(&vnic0->filter);
 
 	/* This flow has same DST MAC as the port/l2 filter. */
@@ -762,8 +761,7 @@ bnxt_find_matching_l2_filter(struct bnxt *bp, struct bnxt_filter_info *nf)
 		if (vnic->fw_vnic_id == INVALID_VNIC_ID)
 			continue;
 
-		STAILQ_FOREACH(flow, &vnic->flow_list, next) {
-			mf = flow->filter;
+		STAILQ_FOREACH(mf, &vnic->filter, next) {
 
 			if (mf->matching_l2_fltr_ptr)
 				continue;
@@ -798,6 +796,8 @@ bnxt_create_l2_filter(struct bnxt *bp, struct bnxt_filter_info *nf,
 	if (filter1 == NULL)
 		return NULL;
 
+	memcpy(filter1, nf, sizeof(*filter1));
+
 	filter1->flags = HWRM_CFA_L2_FILTER_ALLOC_INPUT_FLAGS_XDP_DISABLE;
 	filter1->flags |= HWRM_CFA_L2_FILTER_ALLOC_INPUT_FLAGS_PATH_RX;
 	if (nf->valid_flags & BNXT_FLOW_L2_SRC_VALID_FLAG ||
@@ -880,11 +880,14 @@ bnxt_get_l2_filter(struct bnxt *bp, struct bnxt_filter_info *nf,
 	l2_filter = bnxt_find_matching_l2_filter(bp, nf);
 	if (l2_filter) {
 		l2_filter->l2_ref_cnt++;
-		nf->matching_l2_fltr_ptr = l2_filter;
 	} else {
 		l2_filter = bnxt_create_l2_filter(bp, nf, vnic);
-		nf->matching_l2_fltr_ptr = NULL;
+		if (l2_filter) {
+			STAILQ_INSERT_TAIL(&vnic->filter, l2_filter, next);
+			l2_filter->vnic = vnic;
+		}
 	}
+	nf->matching_l2_fltr_ptr = l2_filter;
 
 	return l2_filter;
 }
@@ -1429,11 +1432,6 @@ bnxt_validate_and_parse_flow(struct rte_eth_dev *dev,
 		goto ret;
 	}
 
-	if (filter1 && !filter->matching_l2_fltr_ptr) {
-		bnxt_free_filter(bp, filter1);
-		filter1->fw_l2_filter_id = -1;
-	}
-
 done:
 	act = bnxt_flow_non_void_action(++act);
 	if (act->type != RTE_FLOW_ACTION_TYPE_END) {
diff --git a/drivers/net/bnxt/bnxt_hwrm.c b/drivers/net/bnxt/bnxt_hwrm.c
index bee4c154f..8178213e5 100644
--- a/drivers/net/bnxt/bnxt_hwrm.c
+++ b/drivers/net/bnxt/bnxt_hwrm.c
@@ -363,10 +363,11 @@ int bnxt_hwrm_cfa_vlan_antispoof_cfg(struct bnxt *bp, uint16_t fid,
 }
 
 int bnxt_hwrm_clear_l2_filter(struct bnxt *bp,
-			   struct bnxt_filter_info *filter)
+			     struct bnxt_filter_info *filter)
 {
 	int rc = 0;
 	struct bnxt_filter_info *l2_filter = filter;
+	struct bnxt_vnic_info *vnic = NULL;
 	struct hwrm_cfa_l2_filter_free_input req = {.req_type = 0 };
 	struct hwrm_cfa_l2_filter_free_output *resp = bp->hwrm_cmd_resp_addr;
 
@@ -379,6 +380,9 @@ int bnxt_hwrm_clear_l2_filter(struct bnxt *bp,
 	PMD_DRV_LOG(DEBUG, "filter: %p l2_filter: %p ref_cnt: %d\n",
 		    filter, l2_filter, l2_filter->l2_ref_cnt);
 
+	if (l2_filter->l2_ref_cnt == 0)
+		return 0;
+
 	if (l2_filter->l2_ref_cnt > 0)
 		l2_filter->l2_ref_cnt--;
 
@@ -395,6 +399,14 @@ int bnxt_hwrm_clear_l2_filter(struct bnxt *bp,
 	HWRM_UNLOCK();
 
 	filter->fw_l2_filter_id = UINT64_MAX;
+	if (l2_filter->l2_ref_cnt == 0) {
+		vnic = l2_filter->vnic;
+		if (vnic) {
+			STAILQ_REMOVE(&vnic->filter, l2_filter,
+				      bnxt_filter_info, next);
+			bnxt_free_filter(bp, l2_filter);
+		}
+	}
 
 	return 0;
 }
@@ -2483,8 +2495,7 @@ int bnxt_clear_hwrm_vnic_filters(struct bnxt *bp, struct bnxt_vnic_info *vnic)
 			rc = bnxt_hwrm_clear_em_filter(bp, filter);
 		else if (filter->filter_type == HWRM_CFA_NTUPLE_FILTER)
 			rc = bnxt_hwrm_clear_ntuple_filter(bp, filter);
-		else
-			rc = bnxt_hwrm_clear_l2_filter(bp, filter);
+		rc = bnxt_hwrm_clear_l2_filter(bp, filter);
 		STAILQ_REMOVE(&vnic->filter, filter, bnxt_filter_info, next);
 		bnxt_free_filter(bp, filter);
 	}
@@ -2506,8 +2517,7 @@ bnxt_clear_hwrm_vnic_flows(struct bnxt *bp, struct bnxt_vnic_info *vnic)
 			rc = bnxt_hwrm_clear_em_filter(bp, filter);
 		else if (filter->filter_type == HWRM_CFA_NTUPLE_FILTER)
 			rc = bnxt_hwrm_clear_ntuple_filter(bp, filter);
-		else
-			rc = bnxt_hwrm_clear_l2_filter(bp, filter);
+		rc = bnxt_hwrm_clear_l2_filter(bp, filter);
 
 		STAILQ_REMOVE(&vnic->flow_list, flow, rte_flow, next);
 		rte_free(flow);
-- 
2.21.0 (Apple Git-122.2)