sfc: Implement ethtool RX NFC rules API instead of n-tuple API

Signed-off-by: NBen Hutchings <bhutchings@solarflare.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/sfc/ethtool.c

@@ -818,9 +818,58 @@ static int efx_ethtool_reset(struct net_device *net_dev, u32 *flags)
 	return efx_reset(efx, rc);
 }
 
+static int efx_ethtool_get_class_rule(struct efx_nic *efx,
+				      struct ethtool_rx_flow_spec *rule)
+{
+	struct ethtool_tcpip4_spec *ip_entry = &rule->h_u.tcp_ip4_spec;
+	struct ethtool_tcpip4_spec *ip_mask = &rule->m_u.tcp_ip4_spec;
+	struct efx_filter_spec spec;
+	u16 vid;
+	u8 proto;
+	int rc;
+
+	rc = efx_filter_get_filter_safe(efx, EFX_FILTER_PRI_MANUAL,
+					rule->location, &spec);
+	if (rc)
+		return rc;
+
+	if (spec.dmaq_id == 0xfff)
+		rule->ring_cookie = RX_CLS_FLOW_DISC;
+	else
+		rule->ring_cookie = spec.dmaq_id;
+
+	rc = efx_filter_get_eth_local(&spec, &vid,
+				      rule->h_u.ether_spec.h_dest);
+	if (rc == 0) {
+		rule->flow_type = ETHER_FLOW;
+		memset(rule->m_u.ether_spec.h_dest, ~0, ETH_ALEN);
+		if (vid != EFX_FILTER_VID_UNSPEC) {
+			rule->flow_type |= FLOW_EXT;
+			rule->h_ext.vlan_tci = htons(vid);
+			rule->m_ext.vlan_tci = htons(0xfff);
+		}
+		return 0;
+	}
+
+	rc = efx_filter_get_ipv4_local(&spec, &proto,
+				       &ip_entry->ip4dst, &ip_entry->pdst);
+	if (rc != 0) {
+		rc = efx_filter_get_ipv4_full(
+			&spec, &proto, &ip_entry->ip4src, &ip_entry->psrc,
+			&ip_entry->ip4dst, &ip_entry->pdst);
+		EFX_WARN_ON_PARANOID(rc);
+		ip_mask->ip4src = ~0;
+		ip_mask->psrc = ~0;
+	}
+	rule->flow_type = (proto == IPPROTO_TCP) ? TCP_V4_FLOW : UDP_V4_FLOW;
+	ip_mask->ip4dst = ~0;
+	ip_mask->pdst = ~0;
+	return rc;
+}
+
 static int
 efx_ethtool_get_rxnfc(struct net_device *net_dev,
-		      struct ethtool_rxnfc *info, u32 *rules __always_unused)
+		      struct ethtool_rxnfc *info, u32 *rule_locs)
 {
 	struct efx_nic *efx = netdev_priv(net_dev);
 
@@ -862,42 +911,80 @@ efx_ethtool_get_rxnfc(struct net_device *net_dev,
 		return 0;
 	}
 
+	case ETHTOOL_GRXCLSRLCNT:
+		info->data = efx_filter_get_rx_id_limit(efx);
+		if (info->data == 0)
+			return -EOPNOTSUPP;
+		info->data |= RX_CLS_LOC_SPECIAL;
+		info->rule_cnt =
+			efx_filter_count_rx_used(efx, EFX_FILTER_PRI_MANUAL);
+		return 0;
+
+	case ETHTOOL_GRXCLSRULE:
+		if (efx_filter_get_rx_id_limit(efx) == 0)
+			return -EOPNOTSUPP;
+		return efx_ethtool_get_class_rule(efx, &info->fs);
+
+	case ETHTOOL_GRXCLSRLALL: {
+		s32 rc;
+		info->data = efx_filter_get_rx_id_limit(efx);
+		if (info->data == 0)
+			return -EOPNOTSUPP;
+		rc = efx_filter_get_rx_ids(efx, EFX_FILTER_PRI_MANUAL,
+					   rule_locs, info->rule_cnt);
+		if (rc < 0)
+			return rc;
+		info->rule_cnt = rc;
+		return 0;
+	}
+
 	default:
 		return -EOPNOTSUPP;
 	}
 }
 
-static int efx_ethtool_set_rx_ntuple(struct net_device *net_dev,
-				     struct ethtool_rx_ntuple *ntuple)
+static int efx_ethtool_set_class_rule(struct efx_nic *efx,
+				      struct ethtool_rx_flow_spec *rule)
 {
-	struct efx_nic *efx = netdev_priv(net_dev);
-	struct ethtool_tcpip4_spec *ip_entry = &ntuple->fs.h_u.tcp_ip4_spec;
-	struct ethtool_tcpip4_spec *ip_mask = &ntuple->fs.m_u.tcp_ip4_spec;
-	struct ethhdr *mac_entry = &ntuple->fs.h_u.ether_spec;
-	struct ethhdr *mac_mask = &ntuple->fs.m_u.ether_spec;
-	struct efx_filter_spec filter;
+	struct ethtool_tcpip4_spec *ip_entry = &rule->h_u.tcp_ip4_spec;
+	struct ethtool_tcpip4_spec *ip_mask = &rule->m_u.tcp_ip4_spec;
+	struct ethhdr *mac_entry = &rule->h_u.ether_spec;
+	struct ethhdr *mac_mask = &rule->m_u.ether_spec;
+	struct efx_filter_spec spec;
 	int rc;
 
-	/* Range-check action */
-	if (ntuple->fs.action < ETHTOOL_RXNTUPLE_ACTION_CLEAR ||
-	    ntuple->fs.action >= (s32)efx->n_rx_channels)
+	/* Check that user wants us to choose the location */
+	if (rule->location != RX_CLS_LOC_ANY &&
+	    rule->location != RX_CLS_LOC_FIRST &&
+	    rule->location != RX_CLS_LOC_LAST)
 		return -EINVAL;
 
-	if (~ntuple->fs.data_mask)
+	/* Range-check ring_cookie */
+	if (rule->ring_cookie >= efx->n_rx_channels &&
+	    rule->ring_cookie != RX_CLS_FLOW_DISC)
 		return -EINVAL;
 
-	efx_filter_init_rx(&filter, EFX_FILTER_PRI_MANUAL, 0,
-			   (ntuple->fs.action == ETHTOOL_RXNTUPLE_ACTION_DROP) ?
-			   0xfff : ntuple->fs.action);
+	/* Check for unsupported extensions */
+	if ((rule->flow_type & FLOW_EXT) &&
+	    (rule->m_ext.vlan_etype | rule->m_ext.data[0] |
+	     rule->m_ext.data[1]))
+		return -EINVAL;
+
+	efx_filter_init_rx(&spec, EFX_FILTER_PRI_MANUAL,
+			   (rule->location == RX_CLS_LOC_FIRST) ?
+			   EFX_FILTER_FLAG_RX_OVERRIDE_IP : 0,
+			   (rule->ring_cookie == RX_CLS_FLOW_DISC) ?
+			   0xfff : rule->ring_cookie);
 
-	switch (ntuple->fs.flow_type) {
+	switch (rule->flow_type) {
 	case TCP_V4_FLOW:
 	case UDP_V4_FLOW: {
-		u8 proto = (ntuple->fs.flow_type == TCP_V4_FLOW ?
+		u8 proto = (rule->flow_type == TCP_V4_FLOW ?
 			    IPPROTO_TCP : IPPROTO_UDP);
 
 		/* Must match all of destination, */
-		if (ip_mask->ip4dst | ip_mask->pdst)
+		if ((__force u32)~ip_mask->ip4dst |
+		    (__force u16)~ip_mask->pdst)
 			return -EINVAL;
 		/* all or none of source, */
 		if ((ip_mask->ip4src | ip_mask->psrc) &&
@@ -905,17 +992,17 @@ static int efx_ethtool_set_rx_ntuple(struct net_device *net_dev,
 		     (__force u16)~ip_mask->psrc))
 			return -EINVAL;
 		/* and nothing else */
-		if ((u8)~ip_mask->tos | (u16)~ntuple->fs.vlan_tag_mask)
+		if (ip_mask->tos | rule->m_ext.vlan_tci)
 			return -EINVAL;
 
-		if (!ip_mask->ip4src)
-			rc = efx_filter_set_ipv4_full(&filter, proto,
+		if (ip_mask->ip4src)
+			rc = efx_filter_set_ipv4_full(&spec, proto,
 						      ip_entry->ip4dst,
 						      ip_entry->pdst,
 						      ip_entry->ip4src,
 						      ip_entry->psrc);
 		else
-			rc = efx_filter_set_ipv4_local(&filter, proto,
+			rc = efx_filter_set_ipv4_local(&spec, proto,
 						       ip_entry->ip4dst,
 						       ip_entry->pdst);
 		if (rc)
@@ -923,23 +1010,24 @@ static int efx_ethtool_set_rx_ntuple(struct net_device *net_dev,
 		break;
 	}
 
-	case ETHER_FLOW:
-		/* Must match all of destination, */
-		if (!is_zero_ether_addr(mac_mask->h_dest))
+	case ETHER_FLOW | FLOW_EXT:
+		/* Must match all or none of VID */
+		if (rule->m_ext.vlan_tci != htons(0xfff) &&
+		    rule->m_ext.vlan_tci != 0)
 			return -EINVAL;
-		/* all or none of VID, */
-		if (ntuple->fs.vlan_tag_mask != 0xf000 &&
-		    ntuple->fs.vlan_tag_mask != 0xffff)
+	case ETHER_FLOW:
+		/* Must match all of destination */
+		if (!is_broadcast_ether_addr(mac_mask->h_dest))
 			return -EINVAL;
 		/* and nothing else */
-		if (!is_broadcast_ether_addr(mac_mask->h_source) ||
-		    mac_mask->h_proto != htons(0xffff))
+		if (!is_zero_ether_addr(mac_mask->h_source) ||
+		    mac_mask->h_proto)
 			return -EINVAL;
 
 		rc = efx_filter_set_eth_local(
-			&filter,
-			(ntuple->fs.vlan_tag_mask == 0xf000) ?
-			ntuple->fs.vlan_tag : EFX_FILTER_VID_UNSPEC,
+			&spec,
+			(rule->flow_type & FLOW_EXT && rule->m_ext.vlan_tci) ?
+			ntohs(rule->h_ext.vlan_tci) : EFX_FILTER_VID_UNSPEC,
 			mac_entry->h_dest);
 		if (rc)
 			return rc;
@@ -949,11 +1037,33 @@ static int efx_ethtool_set_rx_ntuple(struct net_device *net_dev,
 		return -EINVAL;
 	}
 
-	if (ntuple->fs.action == ETHTOOL_RXNTUPLE_ACTION_CLEAR)
-		return efx_filter_remove_filter(efx, &filter);
+	rc = efx_filter_insert_filter(efx, &spec, true);
+	if (rc < 0)
+		return rc;
 
-	rc = efx_filter_insert_filter(efx, &filter, true);
-	return rc < 0 ? rc : 0;
+	rule->location = rc;
+	return 0;
+}
+
+static int efx_ethtool_set_rxnfc(struct net_device *net_dev,
+				 struct ethtool_rxnfc *info)
+{
+	struct efx_nic *efx = netdev_priv(net_dev);
+
+	if (efx_filter_get_rx_id_limit(efx) == 0)
+		return -EOPNOTSUPP;
+
+	switch (info->cmd) {
+	case ETHTOOL_SRXCLSRLINS:
+		return efx_ethtool_set_class_rule(efx, &info->fs);
+
+	case ETHTOOL_SRXCLSRLDEL:
+		return efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_MANUAL,
+						 info->fs.location);
+
+	default:
+		return -EOPNOTSUPP;
+	}
 }
 
 static u32 efx_ethtool_get_rxfh_indir_size(struct net_device *net_dev)
@@ -1007,7 +1117,7 @@ const struct ethtool_ops efx_ethtool_ops = {
 	.set_wol                = efx_ethtool_set_wol,
 	.reset			= efx_ethtool_reset,
 	.get_rxnfc		= efx_ethtool_get_rxnfc,
-	.set_rx_ntuple		= efx_ethtool_set_rx_ntuple,
+	.set_rxnfc		= efx_ethtool_set_rxnfc,
 	.get_rxfh_indir_size	= efx_ethtool_get_rxfh_indir_size,
 	.get_rxfh_indir		= efx_ethtool_get_rxfh_indir,
 	.set_rxfh_indir		= efx_ethtool_set_rxfh_indir,