[Intel-wired-lan] [PATCH net-next v3] ice: Add support for ip TTL & ToS offload

* [Intel-wired-lan] [PATCH net-next v3] ice: Add support for ip TTL & ToS offload
@ 2022-07-29 11:03 Marcin Szycik
  2022-08-19 10:52 ` Buvaneswaran, Sujai
  0 siblings, 1 reply; 4+ messages in thread
From: Marcin Szycik @ 2022-07-29 11:03 UTC (permalink / raw)
  To: intel-wired-lan

Add support for parsing TTL and ToS (Hop Limit and Traffic Class) tc fields
and matching on those fields in filters. Incomplete part of implementation
was already in place (getting enc_ip and enc_tos from flow_match_ip and
writing them to filter header).

Note: matching on ipv6 ip_ttl, enc_ttl and enc_tos is currently not
supported by the DDP package.

Signed-off-by: Marcin Szycik <marcin.szycik@linux.intel.com>
Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
---
v3: rebase (update ICE_TC_FLWR_FIELD_*)
v2: wrap bitops conditions in brackets, use be32p_replace_bits to set
    TC field in ipv6 header (thanks Alex!)

 drivers/net/ethernet/intel/ice/ice_tc_lib.c | 142 +++++++++++++++++++-
 drivers/net/ethernet/intel/ice/ice_tc_lib.h |   6 +
 2 files changed, 144 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_tc_lib.c b/drivers/net/ethernet/intel/ice/ice_tc_lib.c
index a298862857a8..42df686e0215 100644
--- a/drivers/net/ethernet/intel/ice/ice_tc_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_tc_lib.c
@@ -36,6 +36,10 @@ ice_tc_count_lkups(u32 flags, struct ice_tc_flower_lyr_2_4_hdrs *headers,
 		     ICE_TC_FLWR_FIELD_ENC_DEST_IPV6))
 		lkups_cnt++;
 
+	if (flags & (ICE_TC_FLWR_FIELD_ENC_IP_TOS |
+		     ICE_TC_FLWR_FIELD_ENC_IP_TTL))
+		lkups_cnt++;
+
 	if (flags & ICE_TC_FLWR_FIELD_ENC_DEST_L4_PORT)
 		lkups_cnt++;
 
@@ -64,6 +68,9 @@ ice_tc_count_lkups(u32 flags, struct ice_tc_flower_lyr_2_4_hdrs *headers,
 		     ICE_TC_FLWR_FIELD_DEST_IPV6 | ICE_TC_FLWR_FIELD_SRC_IPV6))
 		lkups_cnt++;
 
+	if (flags & (ICE_TC_FLWR_FIELD_IP_TOS | ICE_TC_FLWR_FIELD_IP_TTL))
+		lkups_cnt++;
+
 	/* is L4 (TCP/UDP/any other L4 protocol fields) specified? */
 	if (flags & (ICE_TC_FLWR_FIELD_DEST_L4_PORT |
 		     ICE_TC_FLWR_FIELD_SRC_L4_PORT))
@@ -257,6 +264,50 @@ ice_tc_fill_tunnel_outer(u32 flags, struct ice_tc_flower_fltr *fltr,
 		i++;
 	}
 
+	if (fltr->inner_headers.l2_key.n_proto == htons(ETH_P_IP) &&
+	    (flags & (ICE_TC_FLWR_FIELD_ENC_IP_TOS |
+		      ICE_TC_FLWR_FIELD_ENC_IP_TTL))) {
+		list[i].type = ice_proto_type_from_ipv4(false);
+
+		if (flags & ICE_TC_FLWR_FIELD_ENC_IP_TOS) {
+			list[i].h_u.ipv4_hdr.tos = hdr->l3_key.tos;
+			list[i].m_u.ipv4_hdr.tos = hdr->l3_mask.tos;
+		}
+
+		if (flags & ICE_TC_FLWR_FIELD_ENC_IP_TTL) {
+			list[i].h_u.ipv4_hdr.time_to_live = hdr->l3_key.ttl;
+			list[i].m_u.ipv4_hdr.time_to_live = hdr->l3_mask.ttl;
+		}
+
+		i++;
+	}
+
+	if (fltr->inner_headers.l2_key.n_proto == htons(ETH_P_IPV6) &&
+	    (flags & (ICE_TC_FLWR_FIELD_ENC_IP_TOS |
+		      ICE_TC_FLWR_FIELD_ENC_IP_TTL))) {
+		struct ice_ipv6_hdr *hdr_h, *hdr_m;
+
+		hdr_h = &list[i].h_u.ipv6_hdr;
+		hdr_m = &list[i].m_u.ipv6_hdr;
+		list[i].type = ice_proto_type_from_ipv6(false);
+
+		if (flags & ICE_TC_FLWR_FIELD_ENC_IP_TOS) {
+			be32p_replace_bits(&hdr_h->be_ver_tc_flow,
+					   hdr->l3_key.tos,
+					   ICE_IPV6_HDR_TC_MASK);
+			be32p_replace_bits(&hdr_m->be_ver_tc_flow,
+					   hdr->l3_mask.tos,
+					   ICE_IPV6_HDR_TC_MASK);
+		}
+
+		if (flags & ICE_TC_FLWR_FIELD_ENC_IP_TTL) {
+			hdr_h->hop_limit = hdr->l3_key.ttl;
+			hdr_m->hop_limit = hdr->l3_mask.ttl;
+		}
+
+		i++;
+	}
+
 	if ((flags & ICE_TC_FLWR_FIELD_ENC_DEST_L4_PORT) &&
 	    hdr->l3_key.ip_proto == IPPROTO_UDP) {
 		list[i].type = ICE_UDP_OF;
@@ -420,6 +471,50 @@ ice_tc_fill_rules(struct ice_hw *hw, u32 flags,
 		i++;
 	}
 
+	if (headers->l2_key.n_proto == htons(ETH_P_IP) &&
+	    (flags & (ICE_TC_FLWR_FIELD_IP_TOS | ICE_TC_FLWR_FIELD_IP_TTL))) {
+		list[i].type = ice_proto_type_from_ipv4(inner);
+
+		if (flags & ICE_TC_FLWR_FIELD_IP_TOS) {
+			list[i].h_u.ipv4_hdr.tos = headers->l3_key.tos;
+			list[i].m_u.ipv4_hdr.tos = headers->l3_mask.tos;
+		}
+
+		if (flags & ICE_TC_FLWR_FIELD_IP_TTL) {
+			list[i].h_u.ipv4_hdr.time_to_live =
+				headers->l3_key.ttl;
+			list[i].m_u.ipv4_hdr.time_to_live =
+				headers->l3_mask.ttl;
+		}
+
+		i++;
+	}
+
+	if (headers->l2_key.n_proto == htons(ETH_P_IPV6) &&
+	    (flags & (ICE_TC_FLWR_FIELD_IP_TOS | ICE_TC_FLWR_FIELD_IP_TTL))) {
+		struct ice_ipv6_hdr *hdr_h, *hdr_m;
+
+		hdr_h = &list[i].h_u.ipv6_hdr;
+		hdr_m = &list[i].m_u.ipv6_hdr;
+		list[i].type = ice_proto_type_from_ipv6(inner);
+
+		if (flags & ICE_TC_FLWR_FIELD_IP_TOS) {
+			be32p_replace_bits(&hdr_h->be_ver_tc_flow,
+					   headers->l3_key.tos,
+					   ICE_IPV6_HDR_TC_MASK);
+			be32p_replace_bits(&hdr_m->be_ver_tc_flow,
+					   headers->l3_mask.tos,
+					   ICE_IPV6_HDR_TC_MASK);
+		}
+
+		if (flags & ICE_TC_FLWR_FIELD_IP_TTL) {
+			hdr_h->hop_limit = headers->l3_key.ttl;
+			hdr_m->hop_limit = headers->l3_mask.ttl;
+		}
+
+		i++;
+	}
+
 	/* copy L4 (src, dest) port */
 	if (flags & (ICE_TC_FLWR_FIELD_DEST_L4_PORT |
 		     ICE_TC_FLWR_FIELD_SRC_L4_PORT)) {
@@ -838,6 +933,40 @@ ice_tc_set_ipv6(struct flow_match_ipv6_addrs *match,
 	return 0;
 }
 
+/**
+ * ice_tc_set_tos_ttl - Parse IP ToS/TTL from TC flower filter
+ * @match: Pointer to flow match structure
+ * @fltr: Pointer to filter structure
+ * @headers: inner or outer header fields
+ * @is_encap: set true for tunnel
+ */
+static void
+ice_tc_set_tos_ttl(struct flow_match_ip *match,
+		   struct ice_tc_flower_fltr *fltr,
+		   struct ice_tc_flower_lyr_2_4_hdrs *headers,
+		   bool is_encap)
+{
+	if (match->mask->tos) {
+		if (is_encap)
+			fltr->flags |= ICE_TC_FLWR_FIELD_ENC_IP_TOS;
+		else
+			fltr->flags |= ICE_TC_FLWR_FIELD_IP_TOS;
+
+		headers->l3_key.tos = match->key->tos;
+		headers->l3_mask.tos = match->mask->tos;
+	}
+
+	if (match->mask->ttl) {
+		if (is_encap)
+			fltr->flags |= ICE_TC_FLWR_FIELD_ENC_IP_TTL;
+		else
+			fltr->flags |= ICE_TC_FLWR_FIELD_IP_TTL;
+
+		headers->l3_key.ttl = match->key->ttl;
+		headers->l3_mask.ttl = match->mask->ttl;
+	}
+}
+
 /**
  * ice_tc_set_port - Parse ports from TC flower filter
  * @match: Flow match structure
@@ -967,10 +1096,7 @@ ice_parse_tunnel_attr(struct net_device *dev, struct flow_rule *rule,
 		struct flow_match_ip match;
 
 		flow_rule_match_enc_ip(rule, &match);
-		headers->l3_key.tos = match.key->tos;
-		headers->l3_key.ttl = match.key->ttl;
-		headers->l3_mask.tos = match.mask->tos;
-		headers->l3_mask.ttl = match.mask->ttl;
+		ice_tc_set_tos_ttl(&match, fltr, headers, true);
 	}
 
 	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_PORTS) &&
@@ -1039,6 +1165,7 @@ ice_parse_cls_flower(struct net_device *filter_dev, struct ice_vsi *vsi,
 	      BIT(FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) |
 	      BIT(FLOW_DISSECTOR_KEY_ENC_PORTS) |
 	      BIT(FLOW_DISSECTOR_KEY_ENC_OPTS) |
+	      BIT(FLOW_DISSECTOR_KEY_IP) |
 	      BIT(FLOW_DISSECTOR_KEY_ENC_IP) |
 	      BIT(FLOW_DISSECTOR_KEY_PORTS) |
 	      BIT(FLOW_DISSECTOR_KEY_PPPOE))) {
@@ -1217,6 +1344,13 @@ ice_parse_cls_flower(struct net_device *filter_dev, struct ice_vsi *vsi,
 			return -EINVAL;
 	}
 
+	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_IP)) {
+		struct flow_match_ip match;
+
+		flow_rule_match_ip(rule, &match);
+		ice_tc_set_tos_ttl(&match, fltr, headers, false);
+	}
+
 	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_PORTS)) {
 		struct flow_match_ports match;
 
diff --git a/drivers/net/ethernet/intel/ice/ice_tc_lib.h b/drivers/net/ethernet/intel/ice/ice_tc_lib.h
index 91cd3d3778c7..f397ed02606d 100644
--- a/drivers/net/ethernet/intel/ice/ice_tc_lib.h
+++ b/drivers/net/ethernet/intel/ice/ice_tc_lib.h
@@ -26,9 +26,15 @@
 #define ICE_TC_FLWR_FIELD_CVLAN			BIT(19)
 #define ICE_TC_FLWR_FIELD_PPPOE_SESSID		BIT(20)
 #define ICE_TC_FLWR_FIELD_PPP_PROTO		BIT(21)
+#define ICE_TC_FLWR_FIELD_IP_TOS		BIT(22)
+#define ICE_TC_FLWR_FIELD_IP_TTL		BIT(23)
+#define ICE_TC_FLWR_FIELD_ENC_IP_TOS		BIT(24)
+#define ICE_TC_FLWR_FIELD_ENC_IP_TTL		BIT(25)
 
 #define ICE_TC_FLOWER_MASK_32   0xFFFFFFFF
 
+#define ICE_IPV6_HDR_TC_MASK 0xFF00000
+
 struct ice_indr_block_priv {
 	struct net_device *netdev;
 	struct ice_netdev_priv *np;
-- 
2.35.1

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