Commit 5ec836be authored by Grygorii Strashko's avatar Grygorii Strashko Committed by David S. Miller
Browse files

net: ethernet: ti: am65-cpsw: enable bc/mc storm prevention support 



This patch enables support for ingress broadcast(BC)/multicast(MC) packets
rate limiting in TI AM65x CPSW driver (the corresponding ALE support was
added in previous patch) by implementing HW offload for simple tc-flower
with policer action with matches on dst_mac/mask:
 - ff:ff:ff:ff:ff:ff/ff:ff:ff:ff:ff:ff has to be used for BC packets rate
limiting (exact match)
 - 01:00:00:00:00:00/01:00:00:00:00:00 fixed value has to be used for MC
packets rate limiting

The CPSW supports MC/BC packets rate limiting in packets/sec and affects
all ingress MC/BC packets and serves as BC/MC storm prevention feature.

Examples:
- BC rate limit to 1000pps:
  tc qdisc add dev eth0 clsact
  tc filter add dev eth0 ingress flower skip_sw dst_mac ff:ff:ff:ff:ff:ff \
  action police pkts_rate 1000 pkts_burst 1 drop

- MC rate limit to 20000pps:
  tc qdisc add dev eth0 clsact
  tc filter add dev eth0 ingress flower skip_sw dst_mac 01:00:00:00:00:00/01:00:00:00:00:00 \
  action police rate pkts_rate 20000 pkts_burst 1 drop

  pkts_burst - not used.

Signed-off-by: default avatarGrygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent e3a5e33f

drivers/net/ethernet/ti/am65-cpsw-qos.c

+180 −0
Original line number Diff line number Diff line
@@ -8,10 +8,12 @@ 


#include <linux/pm_runtime.h>

#include <linux/time.h>

#include <net/pkt_cls.h>



#include "am65-cpsw-nuss.h"

#include "am65-cpsw-qos.h"

#include "am65-cpts.h"

#include "cpsw_ale.h"



#define AM65_CPSW_REG_CTL			0x004

#define AM65_CPSW_PN_REG_CTL			0x004
@@ -588,12 +590,190 @@ static int am65_cpsw_setup_taprio(struct net_device *ndev, void *type_data) 
	return am65_cpsw_set_taprio(ndev, type_data);

}



static int am65_cpsw_qos_clsflower_add_policer(struct am65_cpsw_port *port,

					       struct netlink_ext_ack *extack,

					       struct flow_cls_offload *cls,

					       u64 rate_pkt_ps)

{

	struct flow_rule *rule = flow_cls_offload_flow_rule(cls);

	struct flow_dissector *dissector = rule->match.dissector;

	static const u8 mc_mac[] = {0x01, 0x00, 0x00, 0x00, 0x00, 0x00};

	struct am65_cpsw_qos *qos = &port->qos;

	struct flow_match_eth_addrs match;

	int ret;



	if (dissector->used_keys &

	    ~(BIT(FLOW_DISSECTOR_KEY_BASIC) |

	      BIT(FLOW_DISSECTOR_KEY_CONTROL) |

	      BIT(FLOW_DISSECTOR_KEY_ETH_ADDRS))) {

		NL_SET_ERR_MSG_MOD(extack,

				   "Unsupported keys used");

		return -EOPNOTSUPP;

	}



	if (!flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ETH_ADDRS)) {

		NL_SET_ERR_MSG_MOD(extack, "Not matching on eth address");

		return -EOPNOTSUPP;

	}



	flow_rule_match_eth_addrs(rule, &match);



	if (!is_zero_ether_addr(match.mask->src)) {

		NL_SET_ERR_MSG_MOD(extack,

				   "Matching on source MAC not supported");

		return -EOPNOTSUPP;

	}



	if (is_broadcast_ether_addr(match.key->dst) &&

	    is_broadcast_ether_addr(match.mask->dst)) {

		ret = cpsw_ale_rx_ratelimit_bc(port->common->ale, port->port_id, rate_pkt_ps);

		if (ret)

			return ret;



		qos->ale_bc_ratelimit.cookie = cls->cookie;

		qos->ale_bc_ratelimit.rate_packet_ps = rate_pkt_ps;

	} else if (ether_addr_equal_unaligned(match.key->dst, mc_mac) &&

		   ether_addr_equal_unaligned(match.mask->dst, mc_mac)) {

		ret = cpsw_ale_rx_ratelimit_mc(port->common->ale, port->port_id, rate_pkt_ps);

		if (ret)

			return ret;



		qos->ale_mc_ratelimit.cookie = cls->cookie;

		qos->ale_mc_ratelimit.rate_packet_ps = rate_pkt_ps;

	} else {

		NL_SET_ERR_MSG_MOD(extack, "Not supported matching key");

		return -EOPNOTSUPP;

	}



	return 0;

}



static int am65_cpsw_qos_clsflower_policer_validate(const struct flow_action *action,

						    const struct flow_action_entry *act,

						    struct netlink_ext_ack *extack)

{

	if (act->police.exceed.act_id != FLOW_ACTION_DROP) {

		NL_SET_ERR_MSG_MOD(extack,

				   "Offload not supported when exceed action is not drop");

		return -EOPNOTSUPP;

	}



	if (act->police.notexceed.act_id != FLOW_ACTION_PIPE &&

	    act->police.notexceed.act_id != FLOW_ACTION_ACCEPT) {

		NL_SET_ERR_MSG_MOD(extack,

				   "Offload not supported when conform action is not pipe or ok");

		return -EOPNOTSUPP;

	}



	if (act->police.notexceed.act_id == FLOW_ACTION_ACCEPT &&

	    !flow_action_is_last_entry(action, act)) {

		NL_SET_ERR_MSG_MOD(extack,

				   "Offload not supported when conform action is ok, but action is not last");

		return -EOPNOTSUPP;

	}



	if (act->police.rate_bytes_ps || act->police.peakrate_bytes_ps ||

	    act->police.avrate || act->police.overhead) {

		NL_SET_ERR_MSG_MOD(extack,

				   "Offload not supported when bytes per second/peakrate/avrate/overhead is configured");

		return -EOPNOTSUPP;

	}



	return 0;

}



static int am65_cpsw_qos_configure_clsflower(struct am65_cpsw_port *port,

					     struct flow_cls_offload *cls)

{

	struct flow_rule *rule = flow_cls_offload_flow_rule(cls);

	struct netlink_ext_ack *extack = cls->common.extack;

	const struct flow_action_entry *act;

	int i, ret;



	flow_action_for_each(i, act, &rule->action) {

		switch (act->id) {

		case FLOW_ACTION_POLICE:

			ret = am65_cpsw_qos_clsflower_policer_validate(&rule->action, act, extack);

			if (ret)

				return ret;



			return am65_cpsw_qos_clsflower_add_policer(port, extack, cls,

								   act->police.rate_pkt_ps);

		default:

			NL_SET_ERR_MSG_MOD(extack,

					   "Action not supported");

			return -EOPNOTSUPP;

		}

	}

	return -EOPNOTSUPP;

}



static int am65_cpsw_qos_delete_clsflower(struct am65_cpsw_port *port, struct flow_cls_offload *cls)

{

	struct am65_cpsw_qos *qos = &port->qos;



	if (cls->cookie == qos->ale_bc_ratelimit.cookie) {

		qos->ale_bc_ratelimit.cookie = 0;

		qos->ale_bc_ratelimit.rate_packet_ps = 0;

		cpsw_ale_rx_ratelimit_bc(port->common->ale, port->port_id, 0);

	}



	if (cls->cookie == qos->ale_mc_ratelimit.cookie) {

		qos->ale_mc_ratelimit.cookie = 0;

		qos->ale_mc_ratelimit.rate_packet_ps = 0;

		cpsw_ale_rx_ratelimit_mc(port->common->ale, port->port_id, 0);

	}



	return 0;

}



static int am65_cpsw_qos_setup_tc_clsflower(struct am65_cpsw_port *port,

					    struct flow_cls_offload *cls_flower)

{

	switch (cls_flower->command) {

	case FLOW_CLS_REPLACE:

		return am65_cpsw_qos_configure_clsflower(port, cls_flower);

	case FLOW_CLS_DESTROY:

		return am65_cpsw_qos_delete_clsflower(port, cls_flower);

	default:

		return -EOPNOTSUPP;

	}

}



static int am65_cpsw_qos_setup_tc_block_cb(enum tc_setup_type type, void *type_data, void *cb_priv)

{

	struct am65_cpsw_port *port = cb_priv;



	if (!tc_cls_can_offload_and_chain0(port->ndev, type_data))

		return -EOPNOTSUPP;



	switch (type) {

	case TC_SETUP_CLSFLOWER:

		return am65_cpsw_qos_setup_tc_clsflower(port, type_data);

	default:

		return -EOPNOTSUPP;

	}

}



static LIST_HEAD(am65_cpsw_qos_block_cb_list);



static int am65_cpsw_qos_setup_tc_block(struct net_device *ndev, struct flow_block_offload *f)

{

	struct am65_cpsw_port *port = am65_ndev_to_port(ndev);



	return flow_block_cb_setup_simple(f, &am65_cpsw_qos_block_cb_list,

					  am65_cpsw_qos_setup_tc_block_cb,

					  port, port, true);

}



int am65_cpsw_qos_ndo_setup_tc(struct net_device *ndev, enum tc_setup_type type,

			       void *type_data)

{

	switch (type) {

	case TC_SETUP_QDISC_TAPRIO:

		return am65_cpsw_setup_taprio(ndev, type_data);

	case TC_SETUP_BLOCK:

		return am65_cpsw_qos_setup_tc_block(ndev, type_data);

	default:

		return -EOPNOTSUPP;

	}

drivers/net/ethernet/ti/am65-cpsw-qos.h

+8 −0
Original line number Diff line number Diff line
@@ -14,11 +14,19 @@ struct am65_cpsw_est { 
	struct tc_taprio_qopt_offload taprio;

};



struct am65_cpsw_ale_ratelimit {

	unsigned long cookie;

	u64 rate_packet_ps;

};



struct am65_cpsw_qos {

	struct am65_cpsw_est *est_admin;

	struct am65_cpsw_est *est_oper;

	ktime_t link_down_time;

	int link_speed;



	struct am65_cpsw_ale_ratelimit ale_bc_ratelimit;

	struct am65_cpsw_ale_ratelimit ale_mc_ratelimit;

};



int am65_cpsw_qos_ndo_setup_tc(struct net_device *ndev, enum tc_setup_type type,