nfp: flower: reduce action list size by coalescing mangle actions

With the introduction of flow_action_for_each pedit actions are no
longer grouped together, instead pedit actions are broken out per
32 byte word. This results in an inefficient use of the action list
that is pushed to hardware where each 32 byte word becomes its own
action. Therefore we combine groups of 32 byte word before sending
the action list to hardware.
Signed-off-by: Pieter Jansen van Vuuren <pieter.jansenvanvuuren@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

@@ -583,60 +583,23 @@ static u32 nfp_fl_csum_l4_to_flag(u8 ip_proto)
 	}
 }
 
-static int
-nfp_fl_pedit(const struct flow_action_entry *act,
-	     struct tc_cls_flower_offload *flow,
-	     char *nfp_action, int *a_len, u32 *csum_updated)
-{
-	struct flow_rule *rule = tc_cls_flower_offload_flow_rule(flow);
+struct nfp_flower_pedit_acts {
 	struct nfp_fl_set_ipv6_addr set_ip6_dst, set_ip6_src;
 	struct nfp_fl_set_ipv6_tc_hl_fl set_ip6_tc_hl_fl;
 	struct nfp_fl_set_ip4_ttl_tos set_ip_ttl_tos;
 	struct nfp_fl_set_ip4_addrs set_ip_addr;
-	enum flow_action_mangle_base htype;
 	struct nfp_fl_set_tport set_tport;
 	struct nfp_fl_set_eth set_eth;
+};
+
+static int
+nfp_fl_commit_mangle(struct tc_cls_flower_offload *flow, char *nfp_action,
+		     int *a_len, struct nfp_flower_pedit_acts *set_act,
+		     u32 *csum_updated)
+{
+	struct flow_rule *rule = tc_cls_flower_offload_flow_rule(flow);
 	size_t act_size = 0;
 	u8 ip_proto = 0;
-	u32 offset;
-	int err;
-
-	memset(&set_ip6_tc_hl_fl, 0, sizeof(set_ip6_tc_hl_fl));
-	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));
-	memset(&set_tport, 0, sizeof(set_tport));
-	memset(&set_eth, 0, sizeof(set_eth));
-
-	htype = act->mangle.htype;
-	offset = act->mangle.offset;
-
-	switch (htype) {
-	case TCA_PEDIT_KEY_EX_HDR_TYPE_ETH:
-		err = nfp_fl_set_eth(act, offset, &set_eth);
-		break;
-	case TCA_PEDIT_KEY_EX_HDR_TYPE_IP4:
-		err = nfp_fl_set_ip4(act, offset, &set_ip_addr,
-				     &set_ip_ttl_tos);
-		break;
-	case TCA_PEDIT_KEY_EX_HDR_TYPE_IP6:
-		err = nfp_fl_set_ip6(act, offset, &set_ip6_dst,
-				     &set_ip6_src, &set_ip6_tc_hl_fl);
-		break;
-	case TCA_PEDIT_KEY_EX_HDR_TYPE_TCP:
-		err = nfp_fl_set_tport(act, offset, &set_tport,
-				       NFP_FL_ACTION_OPCODE_SET_TCP);
-		break;
-	case TCA_PEDIT_KEY_EX_HDR_TYPE_UDP:
-		err = nfp_fl_set_tport(act, offset, &set_tport,
-				       NFP_FL_ACTION_OPCODE_SET_UDP);
-		break;
-	default:
-		return -EOPNOTSUPP;
-	}
-	if (err)
-		return err;
 
 	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_BASIC)) {
 		struct flow_match_basic match;
@@ -645,77 +608,82 @@ nfp_fl_pedit(const struct flow_action_entry *act,
 		ip_proto = match.key->ip_proto;
 	}
 
-	if (set_eth.head.len_lw) {
-		act_size = sizeof(set_eth);
-		memcpy(nfp_action, &set_eth, act_size);
+	if (set_act->set_eth.head.len_lw) {
+		act_size = sizeof(set_act->set_eth);
+		memcpy(nfp_action, &set_act->set_eth, act_size);
 		*a_len += act_size;
 	}
-	if (set_ip_ttl_tos.head.len_lw) {
+
+	if (set_act->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);
+		act_size = sizeof(set_act->set_ip_ttl_tos);
+		memcpy(nfp_action, &set_act->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) {
+
+	if (set_act->set_ip_addr.head.len_lw) {
 		nfp_action += act_size;
-		act_size = sizeof(set_ip_addr);
-		memcpy(nfp_action, &set_ip_addr, act_size);
+		act_size = sizeof(set_act->set_ip_addr);
+		memcpy(nfp_action, &set_act->set_ip_addr, 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_ip6_tc_hl_fl.head.len_lw) {
+
+	if (set_act->set_ip6_tc_hl_fl.head.len_lw) {
 		nfp_action += act_size;
-		act_size = sizeof(set_ip6_tc_hl_fl);
-		memcpy(nfp_action, &set_ip6_tc_hl_fl, act_size);
+		act_size = sizeof(set_act->set_ip6_tc_hl_fl);
+		memcpy(nfp_action, &set_act->set_ip6_tc_hl_fl, act_size);
 		*a_len += act_size;
 
 		/* Hardware will automatically fix TCP/UDP checksum. */
 		*csum_updated |= nfp_fl_csum_l4_to_flag(ip_proto);
 	}
-	if (set_ip6_dst.head.len_lw && set_ip6_src.head.len_lw) {
+
+	if (set_act->set_ip6_dst.head.len_lw &&
+	    set_act->set_ip6_src.head.len_lw) {
 		/* TC compiles set src and dst IPv6 address as a single action,
 		 * the hardware requires this to be 2 separate actions.
 		 */
 		nfp_action += act_size;
-		act_size = sizeof(set_ip6_src);
-		memcpy(nfp_action, &set_ip6_src, act_size);
+		act_size = sizeof(set_act->set_ip6_src);
+		memcpy(nfp_action, &set_act->set_ip6_src, act_size);
 		*a_len += act_size;
 
-		act_size = sizeof(set_ip6_dst);
-		memcpy(&nfp_action[sizeof(set_ip6_src)], &set_ip6_dst,
-		       act_size);
+		act_size = sizeof(set_act->set_ip6_dst);
+		memcpy(&nfp_action[sizeof(set_act->set_ip6_src)],
+		       &set_act->set_ip6_dst, act_size);
 		*a_len += act_size;
 
 		/* Hardware will automatically fix TCP/UDP checksum. */
 		*csum_updated |= nfp_fl_csum_l4_to_flag(ip_proto);
-	} else if (set_ip6_dst.head.len_lw) {
+	} else if (set_act->set_ip6_dst.head.len_lw) {
 		nfp_action += act_size;
-		act_size = sizeof(set_ip6_dst);
-		memcpy(nfp_action, &set_ip6_dst, act_size);
+		act_size = sizeof(set_act->set_ip6_dst);
+		memcpy(nfp_action, &set_act->set_ip6_dst, act_size);
 		*a_len += act_size;
 
 		/* Hardware will automatically fix TCP/UDP checksum. */
 		*csum_updated |= nfp_fl_csum_l4_to_flag(ip_proto);
-	} else if (set_ip6_src.head.len_lw) {
+	} else if (set_act->set_ip6_src.head.len_lw) {
 		nfp_action += act_size;
-		act_size = sizeof(set_ip6_src);
-		memcpy(nfp_action, &set_ip6_src, act_size);
+		act_size = sizeof(set_act->set_ip6_src);
+		memcpy(nfp_action, &set_act->set_ip6_src, act_size);
 		*a_len += act_size;
 
 		/* Hardware will automatically fix TCP/UDP checksum. */
 		*csum_updated |= nfp_fl_csum_l4_to_flag(ip_proto);
 	}
-	if (set_tport.head.len_lw) {
+	if (set_act->set_tport.head.len_lw) {
 		nfp_action += act_size;
-		act_size = sizeof(set_tport);
-		memcpy(nfp_action, &set_tport, act_size);
+		act_size = sizeof(set_act->set_tport);
+		memcpy(nfp_action, &set_act->set_tport, act_size);
 		*a_len += act_size;
 
 		/* Hardware will automatically fix TCP/UDP checksum. */
@@ -726,7 +694,40 @@ nfp_fl_pedit(const struct flow_action_entry *act,
 }
 
 static int
-nfp_flower_output_action(struct nfp_app *app, const struct flow_action_entry *act,
+nfp_fl_pedit(const struct flow_action_entry *act,
+	     struct tc_cls_flower_offload *flow, char *nfp_action, int *a_len,
+	     u32 *csum_updated, struct nfp_flower_pedit_acts *set_act)
+{
+	enum flow_action_mangle_base htype;
+	u32 offset;
+
+	htype = act->mangle.htype;
+	offset = act->mangle.offset;
+
+	switch (htype) {
+	case TCA_PEDIT_KEY_EX_HDR_TYPE_ETH:
+		return nfp_fl_set_eth(act, offset, &set_act->set_eth);
+	case TCA_PEDIT_KEY_EX_HDR_TYPE_IP4:
+		return nfp_fl_set_ip4(act, offset, &set_act->set_ip_addr,
+				      &set_act->set_ip_ttl_tos);
+	case TCA_PEDIT_KEY_EX_HDR_TYPE_IP6:
+		return nfp_fl_set_ip6(act, offset, &set_act->set_ip6_dst,
+				      &set_act->set_ip6_src,
+				      &set_act->set_ip6_tc_hl_fl);
+	case TCA_PEDIT_KEY_EX_HDR_TYPE_TCP:
+		return nfp_fl_set_tport(act, offset, &set_act->set_tport,
+					NFP_FL_ACTION_OPCODE_SET_TCP);
+	case TCA_PEDIT_KEY_EX_HDR_TYPE_UDP:
+		return nfp_fl_set_tport(act, offset, &set_act->set_tport,
+					NFP_FL_ACTION_OPCODE_SET_UDP);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static int
+nfp_flower_output_action(struct nfp_app *app,
+			 const struct flow_action_entry *act,
 			 struct nfp_fl_payload *nfp_fl, int *a_len,
 			 struct net_device *netdev, bool last,
 			 enum nfp_flower_tun_type *tun_type, int *tun_out_cnt,
@@ -776,7 +777,8 @@ nfp_flower_loop_action(struct nfp_app *app, const struct flow_action_entry *act,
 		       struct nfp_fl_payload *nfp_fl, int *a_len,
 		       struct net_device *netdev,
 		       enum nfp_flower_tun_type *tun_type, int *tun_out_cnt,
-		       int *out_cnt, u32 *csum_updated)
+		       int *out_cnt, u32 *csum_updated,
+		       struct nfp_flower_pedit_acts *set_act)
 {
 	struct nfp_fl_set_ipv4_udp_tun *set_tun;
 	struct nfp_fl_pre_tunnel *pre_tun;
@@ -861,7 +863,7 @@ nfp_flower_loop_action(struct nfp_app *app, const struct flow_action_entry *act,
 		return 0;
 	case FLOW_ACTION_MANGLE:
 		if (nfp_fl_pedit(act, flow, &nfp_fl->action_data[*a_len],
-				 a_len, csum_updated))
+				 a_len, csum_updated, set_act))
 			return -EOPNOTSUPP;
 		break;
 	case FLOW_ACTION_CSUM:
@@ -881,12 +883,49 @@ nfp_flower_loop_action(struct nfp_app *app, const struct flow_action_entry *act,
 	return 0;
 }
 
+static bool nfp_fl_check_mangle_start(struct flow_action *flow_act,
+				      int current_act_idx)
+{
+	struct flow_action_entry current_act;
+	struct flow_action_entry prev_act;
+
+	current_act = flow_act->entries[current_act_idx];
+	if (current_act.id != FLOW_ACTION_MANGLE)
+		return false;
+
+	if (current_act_idx == 0)
+		return true;
+
+	prev_act = flow_act->entries[current_act_idx - 1];
+
+	return prev_act.id != FLOW_ACTION_MANGLE;
+}
+
+static bool nfp_fl_check_mangle_end(struct flow_action *flow_act,
+				    int current_act_idx)
+{
+	struct flow_action_entry current_act;
+	struct flow_action_entry next_act;
+
+	current_act = flow_act->entries[current_act_idx];
+	if (current_act.id != FLOW_ACTION_MANGLE)
+		return false;
+
+	if (current_act_idx == flow_act->num_entries)
+		return true;
+
+	next_act = flow_act->entries[current_act_idx + 1];
+
+	return next_act.id != FLOW_ACTION_MANGLE;
+}
+
 int nfp_flower_compile_action(struct nfp_app *app,
 			      struct tc_cls_flower_offload *flow,
 			      struct net_device *netdev,
 			      struct nfp_fl_payload *nfp_flow)
 {
 	int act_len, act_cnt, err, tun_out_cnt, out_cnt, i;
+	struct nfp_flower_pedit_acts set_act;
 	enum nfp_flower_tun_type tun_type;
 	struct flow_action_entry *act;
 	u32 csum_updated = 0;
@@ -900,12 +939,18 @@ int nfp_flower_compile_action(struct nfp_app *app,
 	out_cnt = 0;
 
 	flow_action_for_each(i, act, &flow->rule->action) {
+		if (nfp_fl_check_mangle_start(&flow->rule->action, i))
+			memset(&set_act, 0, sizeof(set_act));
 		err = nfp_flower_loop_action(app, act, flow, nfp_flow, &act_len,
 					     netdev, &tun_type, &tun_out_cnt,
-					     &out_cnt, &csum_updated);
+					     &out_cnt, &csum_updated, &set_act);
 		if (err)
 			return err;
 		act_cnt++;
+		if (nfp_fl_check_mangle_end(&flow->rule->action, i))
+			nfp_fl_commit_mangle(flow,
+					     &nfp_flow->action_data[act_len],
+					     &act_len, &set_act, &csum_updated);
 	}
 
 	/* We optimise when the action list is small, this can unfortunately