nfp: flower: add ipv4 set ttl and tos offload

Add ipv4 set ttl and tos action offload. Since pedit sets headers per 4
byte word, we need to ensure that setting either version, ihl, protocol,
total length or checksum does not get offloaded.
Signed-off-by: Pieter Jansen van Vuuren <pieter.jansenvanvuuren@netronome.com>
Reviewed-by: John Hurley <john.hurley@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/netronome/nfp/flower/action.c

@@ -384,10 +384,21 @@ nfp_fl_set_eth(const struct tc_action *action, int idx, u32 off,
 	return 0;
 }
 
+struct ipv4_ttl_word {
+	__u8	ttl;
+	__u8	protocol;
+	__sum16	check;
+};
+
 static int
 nfp_fl_set_ip4(const struct tc_action *action, int idx, u32 off,
-	       struct nfp_fl_set_ip4_addrs *set_ip_addr)
+	       struct nfp_fl_set_ip4_addrs *set_ip_addr,
+	       struct nfp_fl_set_ip4_ttl_tos *set_ip_ttl_tos)
 {
+	struct ipv4_ttl_word *ttl_word_mask;
+	struct ipv4_ttl_word *ttl_word;
+	struct iphdr *tos_word_mask;
+	struct iphdr *tos_word;
 	__be32 exact, mask;
 
 	/* We are expecting tcf_pedit to return a big endian value */
@@ -402,20 +413,53 @@ nfp_fl_set_ip4(const struct tc_action *action, int idx, u32 off,
 		set_ip_addr->ipv4_dst_mask |= mask;
 		set_ip_addr->ipv4_dst &= ~mask;
 		set_ip_addr->ipv4_dst |= exact & mask;
+		set_ip_addr->head.jump_id = NFP_FL_ACTION_OPCODE_SET_IPV4_ADDRS;
+		set_ip_addr->head.len_lw = sizeof(*set_ip_addr) >>
+					   NFP_FL_LW_SIZ;
 		break;
 	case offsetof(struct iphdr, saddr):
 		set_ip_addr->ipv4_src_mask |= mask;
 		set_ip_addr->ipv4_src &= ~mask;
 		set_ip_addr->ipv4_src |= exact & mask;
+		set_ip_addr->head.jump_id = NFP_FL_ACTION_OPCODE_SET_IPV4_ADDRS;
+		set_ip_addr->head.len_lw = sizeof(*set_ip_addr) >>
+					   NFP_FL_LW_SIZ;
+		break;
+	case offsetof(struct iphdr, ttl):
+		ttl_word_mask = (struct ipv4_ttl_word *)&mask;
+		ttl_word = (struct ipv4_ttl_word *)&exact;
+
+		if (ttl_word_mask->protocol || ttl_word_mask->check)
+			return -EOPNOTSUPP;
+
+		set_ip_ttl_tos->ipv4_ttl_mask |= ttl_word_mask->ttl;
+		set_ip_ttl_tos->ipv4_ttl &= ~ttl_word_mask->ttl;
+		set_ip_ttl_tos->ipv4_ttl |= ttl_word->ttl & ttl_word_mask->ttl;
+		set_ip_ttl_tos->head.jump_id =
+			NFP_FL_ACTION_OPCODE_SET_IPV4_TTL_TOS;
+		set_ip_ttl_tos->head.len_lw = sizeof(*set_ip_ttl_tos) >>
+					      NFP_FL_LW_SIZ;
+		break;
+	case round_down(offsetof(struct iphdr, tos), 4):
+		tos_word_mask = (struct iphdr *)&mask;
+		tos_word = (struct iphdr *)&exact;
+
+		if (tos_word_mask->version || tos_word_mask->ihl ||
+		    tos_word_mask->tot_len)
+			return -EOPNOTSUPP;
+
+		set_ip_ttl_tos->ipv4_tos_mask |= tos_word_mask->tos;
+		set_ip_ttl_tos->ipv4_tos &= ~tos_word_mask->tos;
+		set_ip_ttl_tos->ipv4_tos |= tos_word->tos & tos_word_mask->tos;
+		set_ip_ttl_tos->head.jump_id =
+			NFP_FL_ACTION_OPCODE_SET_IPV4_TTL_TOS;
+		set_ip_ttl_tos->head.len_lw = sizeof(*set_ip_ttl_tos) >>
+					      NFP_FL_LW_SIZ;
 		break;
 	default:
 		return -EOPNOTSUPP;
 	}
 
-	set_ip_addr->reserved = cpu_to_be16(0);
-	set_ip_addr->head.jump_id = NFP_FL_ACTION_OPCODE_SET_IPV4_ADDRS;
-	set_ip_addr->head.len_lw = sizeof(*set_ip_addr) >> NFP_FL_LW_SIZ;
-
 	return 0;
 }
 
@@ -513,6 +557,7 @@ nfp_fl_pedit(const struct tc_action *action, struct tc_cls_flower_offload *flow,
 	     char *nfp_action, int *a_len, u32 *csum_updated)
 {
 	struct nfp_fl_set_ipv6_addr set_ip6_dst, set_ip6_src;
+	struct nfp_fl_set_ip4_ttl_tos set_ip_ttl_tos;
 	struct nfp_fl_set_ip4_addrs set_ip_addr;
 	struct nfp_fl_set_tport set_tport;
 	struct nfp_fl_set_eth set_eth;
@@ -522,6 +567,7 @@ nfp_fl_pedit(const struct tc_action *action, struct tc_cls_flower_offload *flow,
 	u32 offset, cmd;
 	u8 ip_proto = 0;
 
+	memset(&set_ip_ttl_tos, 0, sizeof(set_ip_ttl_tos));
 	memset(&set_ip6_dst, 0, sizeof(set_ip6_dst));
 	memset(&set_ip6_src, 0, sizeof(set_ip6_src));
 	memset(&set_ip_addr, 0, sizeof(set_ip_addr));
@@ -542,7 +588,8 @@ nfp_fl_pedit(const struct tc_action *action, struct tc_cls_flower_offload *flow,
 			err = nfp_fl_set_eth(action, idx, offset, &set_eth);
 			break;
 		case TCA_PEDIT_KEY_EX_HDR_TYPE_IP4:
-			err = nfp_fl_set_ip4(action, idx, offset, &set_ip_addr);
+			err = nfp_fl_set_ip4(action, idx, offset, &set_ip_addr,
+					     &set_ip_ttl_tos);
 			break;
 		case TCA_PEDIT_KEY_EX_HDR_TYPE_IP6:
 			err = nfp_fl_set_ip6(action, idx, offset, &set_ip6_dst,
@@ -577,6 +624,16 @@ nfp_fl_pedit(const struct tc_action *action, struct tc_cls_flower_offload *flow,
 		memcpy(nfp_action, &set_eth, act_size);
 		*a_len += act_size;
 	}
+	if (set_ip_ttl_tos.head.len_lw) {
+		nfp_action += act_size;
+		act_size = sizeof(set_ip_ttl_tos);
+		memcpy(nfp_action, &set_ip_ttl_tos, act_size);
+		*a_len += act_size;
+
+		/* Hardware will automatically fix IPv4 and TCP/UDP checksum. */
+		*csum_updated |= TCA_CSUM_UPDATE_FLAG_IPV4HDR |
+				nfp_fl_csum_l4_to_flag(ip_proto);
+	}
 	if (set_ip_addr.head.len_lw) {
 		nfp_action += act_size;
 		act_size = sizeof(set_ip_addr);

drivers/net/ethernet/netronome/nfp/flower/cmsg.h

@@ -65,6 +65,7 @@
 #define NFP_FL_ACTION_OPCODE_SET_IPV4_TUNNEL	6
 #define NFP_FL_ACTION_OPCODE_SET_ETHERNET	7
 #define NFP_FL_ACTION_OPCODE_SET_IPV4_ADDRS	9
+#define NFP_FL_ACTION_OPCODE_SET_IPV4_TTL_TOS	10
 #define NFP_FL_ACTION_OPCODE_SET_IPV6_SRC	11
 #define NFP_FL_ACTION_OPCODE_SET_IPV6_DST	12
 #define NFP_FL_ACTION_OPCODE_SET_UDP		14
@@ -125,6 +126,15 @@ struct nfp_fl_set_ip4_addrs {
 	__be32 ipv4_dst;
 };
 
+struct nfp_fl_set_ip4_ttl_tos {
+	struct nfp_fl_act_head head;
+	u8 ipv4_ttl_mask;
+	u8 ipv4_tos_mask;
+	u8 ipv4_ttl;
+	u8 ipv4_tos;
+	__be16 reserved;
+};
+
 struct nfp_fl_set_ipv6_addr {
 	struct nfp_fl_act_head head;
 	__be16 reserved;