qed*: Support drop action classification

With this patch, User can configure for the supported
flows to be dropped. Added a stat "gft_filter_drop"
as well to be populated in ethtool for the dropped flows.

For example -

ethtool -N p5p1 flow-type udp4 dst-port 8000 action -1
ethtool -N p5p1 flow-type tcp4 scr-ip 192.168.8.1 action -1

Signed-off-by: Manish Chopra <manish.chopra@cavium.com>
Signed-off-by: Shahed Shaikh <shahed.shaikh@cavium.com>
Signed-off-by: Ariel Elior <ariel.elior@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/qlogic/qed/qed_l2.c

@@ -1677,6 +1677,8 @@ static void __qed_get_vport_tstats(struct qed_hwfn *p_hwfn,
 	    HILO_64_REGPAIR(tstats.mftag_filter_discard);
 	p_stats->common.mac_filter_discards +=
 	    HILO_64_REGPAIR(tstats.eth_mac_filter_discard);
+	p_stats->common.gft_filter_drop +=
+		HILO_64_REGPAIR(tstats.eth_gft_drop_pkt);
 }
 
 static void __qed_get_vport_ustats_addrlen(struct qed_hwfn *p_hwfn,
@@ -2015,16 +2017,6 @@ qed_configure_rfs_ntuple_filter(struct qed_hwfn *p_hwfn,
 	u8 abs_vport_id = 0;
 	int rc = -EINVAL;
 
-	rc = qed_fw_vport(p_hwfn, p_params->vport_id, &abs_vport_id);
-	if (rc)
-		return rc;
-
-	if (p_params->qid != QED_RFS_NTUPLE_QID_RSS) {
-		rc = qed_fw_l2_queue(p_hwfn, p_params->qid, &abs_rx_q_id);
-		if (rc)
-			return rc;
-	}
-
 	/* Get SPQ entry */
 	memset(&init_data, 0, sizeof(init_data));
 	init_data.cid = qed_spq_get_cid(p_hwfn);
@@ -2049,15 +2041,28 @@ qed_configure_rfs_ntuple_filter(struct qed_hwfn *p_hwfn,
 	DMA_REGPAIR_LE(p_ramrod->pkt_hdr_addr, p_params->addr);
 	p_ramrod->pkt_hdr_length = cpu_to_le16(p_params->length);
 
-	if (p_params->qid != QED_RFS_NTUPLE_QID_RSS) {
+	if (p_params->b_is_drop) {
-		p_ramrod->rx_qid_valid = 1;
+		p_ramrod->vport_id = cpu_to_le16(ETH_GFT_TRASHCAN_VPORT);
-		p_ramrod->rx_qid = cpu_to_le16(abs_rx_q_id);
+	} else {
+		rc = qed_fw_vport(p_hwfn, p_params->vport_id, &abs_vport_id);
+		if (rc)
+			return rc;
+
+		if (p_params->qid != QED_RFS_NTUPLE_QID_RSS) {
+			rc = qed_fw_l2_queue(p_hwfn, p_params->qid,
+					     &abs_rx_q_id);
+			if (rc)
+				return rc;
+
+			p_ramrod->rx_qid_valid = 1;
+			p_ramrod->rx_qid = cpu_to_le16(abs_rx_q_id);
+		}
+
+		p_ramrod->vport_id = cpu_to_le16((u16)abs_vport_id);
 	}
 
 	p_ramrod->flow_id_valid = 0;
 	p_ramrod->flow_id = 0;
-
-	p_ramrod->vport_id = cpu_to_le16((u16)abs_vport_id);
 	p_ramrod->filter_action = p_params->b_is_add ? GFT_ADD_FILTER
 	    : GFT_DELETE_FILTER;
 

drivers/net/ethernet/qlogic/qede/qede.h

@@ -75,6 +75,7 @@ struct qede_stats_common {
 	u64 rx_bcast_pkts;
 	u64 mftag_filter_discards;
 	u64 mac_filter_discards;
+	u64 gft_filter_drop;
 	u64 tx_ucast_bytes;
 	u64 tx_mcast_bytes;
 	u64 tx_bcast_bytes;

drivers/net/ethernet/qlogic/qede/qede_ethtool.c

@@ -161,6 +161,7 @@ static const struct {
 	QEDE_STAT(no_buff_discards),
 	QEDE_PF_STAT(mftag_filter_discards),
 	QEDE_PF_STAT(mac_filter_discards),
+	QEDE_PF_STAT(gft_filter_drop),
 	QEDE_STAT(tx_err_drop_pkts),
 	QEDE_STAT(ttl0_discard),
 	QEDE_STAT(packet_too_big_discard),

drivers/net/ethernet/qlogic/qede/qede_filter.c

@@ -90,6 +90,7 @@ struct qede_arfs_fltr_node {
 	bool filter_op;
 	bool used;
 	u8 fw_rc;
+	bool b_is_drop;
 	struct hlist_node node;
 };
 
@@ -125,6 +126,7 @@ static void qede_configure_arfs_fltr(struct qede_dev *edev,
 	params.length = n->buf_len;
 	params.qid = rxq_id;
 	params.b_is_add = add_fltr;
+	params.b_is_drop = n->b_is_drop;
 
 	if (n->vfid) {
 		params.b_is_vf = true;
@@ -1445,6 +1447,9 @@ int qede_get_cls_rule_entry(struct qede_dev *edev, struct ethtool_rxnfc *cmd)
 		fsp->ring_cookie |= ((u64)fltr->vfid) <<
 					ETHTOOL_RX_FLOW_SPEC_RING_VF_OFF;
 	}
+
+	if (fltr->b_is_drop)
+		fsp->ring_cookie = RX_CLS_FLOW_DISC;
 unlock:
 	__qede_unlock(edev);
 	return rc;
@@ -1816,6 +1821,10 @@ static int qede_flow_spec_validate(struct qede_dev *edev,
 		return -EINVAL;
 	}
 
+	/* If drop requested then no need to validate other data */
+	if (fs->ring_cookie == RX_CLS_FLOW_DISC)
+		return 0;
+
 	if (ethtool_get_flow_spec_ring_vf(fs->ring_cookie))
 		return 0;
 
@@ -1852,6 +1861,11 @@ static void qede_flow_set_destination(struct qede_dev *edev,
 				      struct qede_arfs_fltr_node *n,
 				      struct ethtool_rx_flow_spec *fs)
 {
+	if (fs->ring_cookie == RX_CLS_FLOW_DISC) {
+		n->b_is_drop = true;
+		return;
+	}
+
 	n->vfid = ethtool_get_flow_spec_ring_vf(fs->ring_cookie);
 	n->rxq_id = ethtool_get_flow_spec_ring(fs->ring_cookie);
 	n->next_rxq_id = n->rxq_id;

drivers/net/ethernet/qlogic/qede/qede_main.c

@@ -347,6 +347,7 @@ void qede_fill_by_demand_stats(struct qede_dev *edev)
 	p_common->rx_bcast_pkts = stats.common.rx_bcast_pkts;
 	p_common->mftag_filter_discards = stats.common.mftag_filter_discards;
 	p_common->mac_filter_discards = stats.common.mac_filter_discards;
+	p_common->gft_filter_drop = stats.common.gft_filter_drop;
 
 	p_common->tx_ucast_bytes = stats.common.tx_ucast_bytes;
 	p_common->tx_mcast_bytes = stats.common.tx_mcast_bytes;

include/linux/qed/qed_eth_if.h

@@ -89,6 +89,9 @@ struct qed_ntuple_filter_params {
 
 	/* true iff this filter is to be added. Else to be removed */
 	bool b_is_add;
+
+	/* If flow needs to be dropped */
+	bool b_is_drop;
 };
 
 struct qed_dev_eth_info {

include/linux/qed/qed_if.h

@@ -1129,6 +1129,7 @@ struct qed_eth_stats_common {
 	u64	rx_bcast_pkts;
 	u64	mftag_filter_discards;
 	u64	mac_filter_discards;
+	u64	gft_filter_drop;
 	u64	tx_ucast_bytes;
 	u64	tx_mcast_bytes;
 	u64	tx_bcast_bytes;