bnxt_en: ethtool: Support unset l4proto on ip4/ip6 ntuple rules

Previously, trying to insert an ip4/ip6 ntuple rule with an unset
l4proto would get rejected with -EOPNOTSUPP. For example, the following
would fail:

    ethtool -N eth0 flow-type ip6 dst-ip $IP6 context 1

The reason was that all the l4proto validation was being run despite the
l4proto mask being set to 0x0. Fix by respecting the mask on l4proto and
treating a mask of 0x0 as wildcard l4proto.

Signed-off-by: Daniel Xu <dxu@dxuuu.xyz>
Reviewed-by: Michael Chan <michael.chan@broadcom.com>
Link: https://patch.msgid.link/1ac93a2836b25f79e7045f8874d9a17875229ffc.1730778566.git.dxu@dxuuu.xyz
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: danobi

drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c

@@ -1124,7 +1124,12 @@ static int bnxt_grxclsrule(struct bnxt *bp, struct ethtool_rxnfc *cmd)
 	fkeys = &fltr->fkeys;
 	fmasks = &fltr->fmasks;
 	if (fkeys->basic.n_proto == htons(ETH_P_IP)) {
-		if (fkeys->basic.ip_proto == IPPROTO_ICMP) {
+		if (fkeys->basic.ip_proto == BNXT_IP_PROTO_WILDCARD) {
+			fs->flow_type = IP_USER_FLOW;
+			fs->h_u.usr_ip4_spec.ip_ver = ETH_RX_NFC_IP4;
+			fs->h_u.usr_ip4_spec.proto = BNXT_IP_PROTO_WILDCARD;
+			fs->m_u.usr_ip4_spec.proto = 0;
+		} else if (fkeys->basic.ip_proto == IPPROTO_ICMP) {
 			fs->flow_type = IP_USER_FLOW;
 			fs->h_u.usr_ip4_spec.ip_ver = ETH_RX_NFC_IP4;
 			fs->h_u.usr_ip4_spec.proto = IPPROTO_ICMP;
@@ -1149,7 +1154,11 @@ static int bnxt_grxclsrule(struct bnxt *bp, struct ethtool_rxnfc *cmd)
 			fs->m_u.tcp_ip4_spec.pdst = fmasks->ports.dst;
 		}
 	} else {
-		if (fkeys->basic.ip_proto == IPPROTO_ICMPV6) {
+		if (fkeys->basic.ip_proto == BNXT_IP_PROTO_WILDCARD) {
+			fs->flow_type = IPV6_USER_FLOW;
+			fs->h_u.usr_ip6_spec.l4_proto = BNXT_IP_PROTO_WILDCARD;
+			fs->m_u.usr_ip6_spec.l4_proto = 0;
+		} else if (fkeys->basic.ip_proto == IPPROTO_ICMPV6) {
 			fs->flow_type = IPV6_USER_FLOW;
 			fs->h_u.usr_ip6_spec.l4_proto = IPPROTO_ICMPV6;
 			fs->m_u.usr_ip6_spec.l4_proto = BNXT_IP_PROTO_FULL_MASK;
@@ -1274,20 +1283,24 @@ static int bnxt_add_l2_cls_rule(struct bnxt *bp,
 static bool bnxt_verify_ntuple_ip4_flow(struct ethtool_usrip4_spec *ip_spec,
 					struct ethtool_usrip4_spec *ip_mask)
 {
+	u8 mproto = ip_mask->proto;
+	u8 sproto = ip_spec->proto;
+
 	if (ip_mask->l4_4_bytes || ip_mask->tos ||
 	    ip_spec->ip_ver != ETH_RX_NFC_IP4 ||
-	    ip_mask->proto != BNXT_IP_PROTO_FULL_MASK ||
-	    ip_spec->proto != IPPROTO_ICMP)
+	    (mproto && (mproto != BNXT_IP_PROTO_FULL_MASK || sproto != IPPROTO_ICMP)))
 		return false;
 	return true;
 }
 
 static bool bnxt_verify_ntuple_ip6_flow(struct ethtool_usrip6_spec *ip_spec,
 					struct ethtool_usrip6_spec *ip_mask)
 {
+	u8 mproto = ip_mask->l4_proto;
+	u8 sproto = ip_spec->l4_proto;
+
 	if (ip_mask->l4_4_bytes || ip_mask->tclass ||
-	    ip_mask->l4_proto != BNXT_IP_PROTO_FULL_MASK ||
-	    ip_spec->l4_proto != IPPROTO_ICMPV6)
+	    (mproto && (mproto != BNXT_IP_PROTO_FULL_MASK || sproto != IPPROTO_ICMPV6)))
 		return false;
 	return true;
 }
@@ -1341,7 +1354,8 @@ static int bnxt_add_ntuple_cls_rule(struct bnxt *bp,
 		struct ethtool_usrip4_spec *ip_spec = &fs->h_u.usr_ip4_spec;
 		struct ethtool_usrip4_spec *ip_mask = &fs->m_u.usr_ip4_spec;
 
-		fkeys->basic.ip_proto = ip_spec->proto;
+		fkeys->basic.ip_proto = ip_mask->proto ? ip_spec->proto
+						       : BNXT_IP_PROTO_WILDCARD;
 		fkeys->basic.n_proto = htons(ETH_P_IP);
 		fkeys->addrs.v4addrs.src = ip_spec->ip4src;
 		fmasks->addrs.v4addrs.src = ip_mask->ip4src;
@@ -1372,7 +1386,8 @@ static int bnxt_add_ntuple_cls_rule(struct bnxt *bp,
 		struct ethtool_usrip6_spec *ip_spec = &fs->h_u.usr_ip6_spec;
 		struct ethtool_usrip6_spec *ip_mask = &fs->m_u.usr_ip6_spec;
 
-		fkeys->basic.ip_proto = ip_spec->l4_proto;
+		fkeys->basic.ip_proto = ip_mask->l4_proto ? ip_spec->l4_proto
+							  : BNXT_IP_PROTO_WILDCARD;
 		fkeys->basic.n_proto = htons(ETH_P_IPV6);
 		fkeys->addrs.v6addrs.src = *(struct in6_addr *)&ip_spec->ip6src;
 		fmasks->addrs.v6addrs.src = *(struct in6_addr *)&ip_mask->ip6src;

drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.h

@@ -44,6 +44,7 @@ struct bnxt_led_cfg {
 #define BNXT_PXP_REG_LEN	0x3110
 
 #define BNXT_IP_PROTO_FULL_MASK	0xFF
+#define BNXT_IP_PROTO_WILDCARD	0x0
 
 extern const struct ethtool_ops bnxt_ethtool_ops;