cxgb4: add mirror action to TC-MATCHALL offload

Add mirror Virtual Interface (VI) support to receive all ingress
mirror traffic from the underlying device. The mirror VI is
created dynamically, if the TC-MATCHALL rule has a corresponding
mirror action. Also request MSI-X vectors needed for the mirror VI
Rxqs. If no vectors are available, then disable mirror VI support.

v3:
- Replace mirror VI refcount_t with normal u32 variable.

v2:
- Add mutex to protect all mirror VI data, instead of just
  mirror Rxqs.

Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/chelsio/cxgb4/cxgb4.h

@@ -679,6 +679,12 @@ struct port_info {
 	u8 rx_cchan;
 
 	bool tc_block_shared;
+
+	/* Mirror VI information */
+	u16 viid_mirror;
+	u16 nmirrorqsets;
+	u32 vi_mirror_count;
+	struct mutex vi_mirror_mutex; /* Sync access to Mirror VI info */
 };
 
 struct dentry;
@@ -960,6 +966,7 @@ struct sge {
 	u16 ofldqsets;              /* # of active ofld queue sets */
 	u16 nqs_per_uld;	    /* # of Rx queues per ULD */
 	u16 eoqsets;                /* # of ETHOFLD queues */
+	u16 mirrorqsets;            /* # of Mirror queues */
 
 	u16 timer_val[SGE_NTIMERS];
 	u8 counter_val[SGE_NCOUNTERS];
@@ -1857,6 +1864,8 @@ int t4_init_rss_mode(struct adapter *adap, int mbox);
 int t4_init_portinfo(struct port_info *pi, int mbox,
 		     int port, int pf, int vf, u8 mac[]);
 int t4_port_init(struct adapter *adap, int mbox, int pf, int vf);
+int t4_init_port_mirror(struct port_info *pi, u8 mbox, u8 port, u8 pf, u8 vf,
+			u16 *mirror_viid);
 void t4_fatal_err(struct adapter *adapter);
 unsigned int t4_chip_rss_size(struct adapter *adapter);
 int t4_config_rss_range(struct adapter *adapter, int mbox, unsigned int viid,
@@ -2141,6 +2150,8 @@ int cxgb_open(struct net_device *dev);
 int cxgb_close(struct net_device *dev);
 void cxgb4_enable_rx(struct adapter *adap, struct sge_rspq *q);
 void cxgb4_quiesce_rx(struct sge_rspq *q);
+int cxgb4_port_mirror_alloc(struct net_device *dev);
+void cxgb4_port_mirror_free(struct net_device *dev);
 #ifdef CONFIG_CHELSIO_TLS_DEVICE
 int cxgb4_set_ktls_feature(struct adapter *adap, bool enable);
 #endif

drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c

@@ -1285,6 +1285,55 @@ static int setup_debugfs(struct adapter *adap)
 	return 0;
 }
 
+int cxgb4_port_mirror_alloc(struct net_device *dev)
+{
+	struct port_info *pi = netdev2pinfo(dev);
+	struct adapter *adap = netdev2adap(dev);
+	int ret = 0;
+
+	if (!pi->nmirrorqsets)
+		return -EOPNOTSUPP;
+
+	mutex_lock(&pi->vi_mirror_mutex);
+	if (pi->viid_mirror) {
+		pi->vi_mirror_count++;
+		goto out_unlock;
+	}
+
+	ret = t4_init_port_mirror(pi, adap->mbox, pi->port_id, adap->pf, 0,
+				  &pi->viid_mirror);
+	if (ret)
+		goto out_unlock;
+
+	pi->vi_mirror_count = 1;
+
+out_unlock:
+	mutex_unlock(&pi->vi_mirror_mutex);
+	return ret;
+}
+
+void cxgb4_port_mirror_free(struct net_device *dev)
+{
+	struct port_info *pi = netdev2pinfo(dev);
+	struct adapter *adap = netdev2adap(dev);
+
+	mutex_lock(&pi->vi_mirror_mutex);
+	if (!pi->viid_mirror)
+		goto out_unlock;
+
+	if (pi->vi_mirror_count > 1) {
+		pi->vi_mirror_count--;
+		goto out_unlock;
+	}
+
+	pi->vi_mirror_count = 0;
+	t4_free_vi(adap, adap->mbox, adap->pf, 0, pi->viid_mirror);
+	pi->viid_mirror = 0;
+
+out_unlock:
+	mutex_unlock(&pi->vi_mirror_mutex);
+}
+
 /*
  * upper-layer driver support
  */
@@ -5504,6 +5553,19 @@ static int cfg_queues(struct adapter *adap)
 		avail_qsets -= s->eoqsets;
 	}
 
+	/* Mirror queues must follow same scheme as normal Ethernet
+	 * Queues, when there are enough queues available. Otherwise,
+	 * allocate at least 1 queue per port. If even 1 queue is not
+	 * available, then disable mirror queues support.
+	 */
+	if (avail_qsets >= s->max_ethqsets)
+		s->mirrorqsets = s->max_ethqsets;
+	else if (avail_qsets >= adap->params.nports)
+		s->mirrorqsets = adap->params.nports;
+	else
+		s->mirrorqsets = 0;
+	avail_qsets -= s->mirrorqsets;
+
 	for (i = 0; i < ARRAY_SIZE(s->ethrxq); i++) {
 		struct sge_eth_rxq *r = &s->ethrxq[i];
 
@@ -5617,8 +5679,8 @@ void cxgb4_free_msix_idx_in_bmap(struct adapter *adap,
 
 static int enable_msix(struct adapter *adap)
 {
-	u32 eth_need, uld_need = 0, ethofld_need = 0;
-	u32 ethqsets = 0, ofldqsets = 0, eoqsets = 0;
+	u32 eth_need, uld_need = 0, ethofld_need = 0, mirror_need = 0;
+	u32 ethqsets = 0, ofldqsets = 0, eoqsets = 0, mirrorqsets = 0;
 	u8 num_uld = 0, nchan = adap->params.nports;
 	u32 i, want, need, num_vec;
 	struct sge *s = &adap->sge;
@@ -5649,6 +5711,12 @@ static int enable_msix(struct adapter *adap)
 		need += ethofld_need;
 	}
 
+	if (s->mirrorqsets) {
+		want += s->mirrorqsets;
+		mirror_need = nchan;
+		need += mirror_need;
+	}
+
 	want += EXTRA_VECS;
 	need += EXTRA_VECS;
 
@@ -5682,8 +5750,10 @@ static int enable_msix(struct adapter *adap)
 		adap->params.ethofld = 0;
 		s->ofldqsets = 0;
 		s->eoqsets = 0;
+		s->mirrorqsets = 0;
 		uld_need = 0;
 		ethofld_need = 0;
+		mirror_need = 0;
 	}
 
 	num_vec = allocated;
@@ -5697,6 +5767,8 @@ static int enable_msix(struct adapter *adap)
 			ofldqsets = nchan;
 		if (is_ethofld(adap))
 			eoqsets = ethofld_need;
+		if (s->mirrorqsets)
+			mirrorqsets = mirror_need;
 
 		num_vec -= need;
 		while (num_vec) {
@@ -5728,12 +5800,25 @@ static int enable_msix(struct adapter *adap)
 				num_vec -= uld_need;
 			}
 		}
+
+		if (s->mirrorqsets) {
+			while (num_vec) {
+				if (num_vec < mirror_need ||
+				    mirrorqsets > s->mirrorqsets)
+					break;
+
+				mirrorqsets++;
+				num_vec -= mirror_need;
+			}
+		}
 	} else {
 		ethqsets = s->max_ethqsets;
 		if (is_uld(adap))
 			ofldqsets = s->ofldqsets;
 		if (is_ethofld(adap))
 			eoqsets = s->eoqsets;
+		if (s->mirrorqsets)
+			mirrorqsets = s->mirrorqsets;
 	}
 
 	if (ethqsets < s->max_ethqsets) {
@@ -5749,6 +5834,15 @@ static int enable_msix(struct adapter *adap)
 	if (is_ethofld(adap))
 		s->eoqsets = eoqsets;
 
+	if (s->mirrorqsets) {
+		s->mirrorqsets = mirrorqsets;
+		for_each_port(adap, i) {
+			pi = adap2pinfo(adap, i);
+			pi->nmirrorqsets = s->mirrorqsets / nchan;
+			mutex_init(&pi->vi_mirror_mutex);
+		}
+	}
+
 	/* map for msix */
 	ret = alloc_msix_info(adap, allocated);
 	if (ret)
@@ -5760,8 +5854,9 @@ static int enable_msix(struct adapter *adap)
 	}
 
 	dev_info(adap->pdev_dev,
-		 "%d MSI-X vectors allocated, nic %d eoqsets %d per uld %d\n",
-		 allocated, s->max_ethqsets, s->eoqsets, s->nqs_per_uld);
+		 "%d MSI-X vectors allocated, nic %d eoqsets %d per uld %d mirrorqsets %d\n",
+		 allocated, s->max_ethqsets, s->eoqsets, s->nqs_per_uld,
+		 s->mirrorqsets);
 
 	kfree(entries);
 	return 0;

drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_flower.c

@@ -372,6 +372,7 @@ void cxgb4_process_flow_actions(struct net_device *in,
 		case FLOW_ACTION_DROP:
 			fs->action = FILTER_DROP;
 			break;
+		case FLOW_ACTION_MIRRED:
 		case FLOW_ACTION_REDIRECT: {
 			struct net_device *out = act->dev;
 			struct port_info *pi = netdev_priv(out);
@@ -529,7 +530,8 @@ static bool valid_pedit_action(struct net_device *dev,
 
 int cxgb4_validate_flow_actions(struct net_device *dev,
 				struct flow_action *actions,
-				struct netlink_ext_ack *extack)
+				struct netlink_ext_ack *extack,
+				u8 matchall_filter)
 {
 	struct flow_action_entry *act;
 	bool act_redir = false;
@@ -546,11 +548,19 @@ int cxgb4_validate_flow_actions(struct net_device *dev,
 		case FLOW_ACTION_DROP:
 			/* Do nothing */
 			break;
+		case FLOW_ACTION_MIRRED:
 		case FLOW_ACTION_REDIRECT: {
 			struct adapter *adap = netdev2adap(dev);
 			struct net_device *n_dev, *target_dev;
-			unsigned int i;
 			bool found = false;
+			unsigned int i;
+
+			if (act->id == FLOW_ACTION_MIRRED &&
+			    !matchall_filter) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "Egress mirror action is only supported for tc-matchall");
+				return -EOPNOTSUPP;
+			}
 
 			target_dev = act->dev;
 			for_each_port(adap, i) {
@@ -689,7 +699,7 @@ int cxgb4_flow_rule_replace(struct net_device *dev, struct flow_rule *rule,
 	u8 inet_family;
 	int fidx, ret;
 
-	if (cxgb4_validate_flow_actions(dev, &rule->action, extack))
+	if (cxgb4_validate_flow_actions(dev, &rule->action, extack, 0))
 		return -EOPNOTSUPP;
 
 	if (cxgb4_validate_flow_match(dev, rule))

drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_flower.h

@@ -113,7 +113,8 @@ void cxgb4_process_flow_actions(struct net_device *in,
 				struct ch_filter_specification *fs);
 int cxgb4_validate_flow_actions(struct net_device *dev,
 				struct flow_action *actions,
-				struct netlink_ext_ack *extack);
+				struct netlink_ext_ack *extack,
+				u8 matchall_filter);
 
 int cxgb4_tc_flower_replace(struct net_device *dev,
 			    struct flow_cls_offload *cls);

drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_matchall.c

@@ -188,6 +188,49 @@ static void cxgb4_matchall_free_tc(struct net_device *dev)
 	tc_port_matchall->egress.state = CXGB4_MATCHALL_STATE_DISABLED;
 }
 
+static int cxgb4_matchall_mirror_alloc(struct net_device *dev,
+				       struct tc_cls_matchall_offload *cls)
+{
+	struct netlink_ext_ack *extack = cls->common.extack;
+	struct cxgb4_tc_port_matchall *tc_port_matchall;
+	struct port_info *pi = netdev2pinfo(dev);
+	struct adapter *adap = netdev2adap(dev);
+	struct flow_action_entry *act;
+	int ret;
+	u32 i;
+
+	tc_port_matchall = &adap->tc_matchall->port_matchall[pi->port_id];
+	flow_action_for_each(i, act, &cls->rule->action) {
+		if (act->id == FLOW_ACTION_MIRRED) {
+			ret = cxgb4_port_mirror_alloc(dev);
+			if (ret) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "Couldn't allocate mirror");
+				return ret;
+			}
+
+			tc_port_matchall->ingress.viid_mirror = pi->viid_mirror;
+			break;
+		}
+	}
+
+	return 0;
+}
+
+static void cxgb4_matchall_mirror_free(struct net_device *dev)
+{
+	struct cxgb4_tc_port_matchall *tc_port_matchall;
+	struct port_info *pi = netdev2pinfo(dev);
+	struct adapter *adap = netdev2adap(dev);
+
+	tc_port_matchall = &adap->tc_matchall->port_matchall[pi->port_id];
+	if (!tc_port_matchall->ingress.viid_mirror)
+		return;
+
+	cxgb4_port_mirror_free(dev);
+	tc_port_matchall->ingress.viid_mirror = 0;
+}
+
 static int cxgb4_matchall_alloc_filter(struct net_device *dev,
 				       struct tc_cls_matchall_offload *cls)
 {
@@ -211,6 +254,10 @@ static int cxgb4_matchall_alloc_filter(struct net_device *dev,
 		return -ENOMEM;
 	}
 
+	ret = cxgb4_matchall_mirror_alloc(dev, cls);
+	if (ret)
+		return ret;
+
 	tc_port_matchall = &adap->tc_matchall->port_matchall[pi->port_id];
 	fs = &tc_port_matchall->ingress.fs;
 	memset(fs, 0, sizeof(*fs));
@@ -229,11 +276,15 @@ static int cxgb4_matchall_alloc_filter(struct net_device *dev,
 
 	ret = cxgb4_set_filter(dev, fidx, fs);
 	if (ret)
-		return ret;
+		goto out_free;
 
 	tc_port_matchall->ingress.tid = fidx;
 	tc_port_matchall->ingress.state = CXGB4_MATCHALL_STATE_ENABLED;
 	return 0;
+
+out_free:
+	cxgb4_matchall_mirror_free(dev);
+	return ret;
 }
 
 static int cxgb4_matchall_free_filter(struct net_device *dev)
@@ -250,6 +301,8 @@ static int cxgb4_matchall_free_filter(struct net_device *dev)
 	if (ret)
 		return ret;
 
+	cxgb4_matchall_mirror_free(dev);
+
 	tc_port_matchall->ingress.packets = 0;
 	tc_port_matchall->ingress.bytes = 0;
 	tc_port_matchall->ingress.last_used = 0;
@@ -279,7 +332,7 @@ int cxgb4_tc_matchall_replace(struct net_device *dev,
 
 		ret = cxgb4_validate_flow_actions(dev,
 						  &cls_matchall->rule->action,
-						  extack);
+						  extack, 1);
 		if (ret)
 			return ret;
 

drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_matchall.h

@@ -21,6 +21,7 @@ struct cxgb4_matchall_ingress_entry {
 	enum cxgb4_matchall_state state; /* Current MATCHALL offload state */
 	u32 tid; /* Index to hardware filter entry */
 	struct ch_filter_specification fs; /* Filter entry */
+	u16 viid_mirror; /* Identifier for allocated Mirror VI */
 	u64 bytes; /* # of bytes hitting the filter */
 	u64 packets; /* # of packets hitting the filter */
 	u64 last_used; /* Last updated jiffies time */

drivers/net/ethernet/chelsio/cxgb4/t4_hw.c

@@ -9711,6 +9711,22 @@ int t4_port_init(struct adapter *adap, int mbox, int pf, int vf)
 	return 0;
 }
 
+int t4_init_port_mirror(struct port_info *pi, u8 mbox, u8 port, u8 pf, u8 vf,
+			u16 *mirror_viid)
+{
+	int ret;
+
+	ret = t4_alloc_vi(pi->adapter, mbox, port, pf, vf, 1, NULL, NULL,
+			  NULL, NULL);
+	if (ret < 0)
+		return ret;
+
+	if (mirror_viid)
+		*mirror_viid = ret;
+
+	return 0;
+}
+
 /**
  *	t4_read_cimq_cfg - read CIM queue configuration
  *	@adap: the adapter