diff options
Diffstat (limited to 'drivers/net/ethernet/microchip/lan966x/lan966x_tc_flower.c')
| -rw-r--r-- | drivers/net/ethernet/microchip/lan966x/lan966x_tc_flower.c | 360 |
1 files changed, 360 insertions, 0 deletions
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_tc_flower.c b/drivers/net/ethernet/microchip/lan966x/lan966x_tc_flower.c new file mode 100644 index 000000000..f960727ec --- /dev/null +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_tc_flower.c @@ -0,0 +1,360 @@ +// SPDX-License-Identifier: GPL-2.0+ + +#include "lan966x_main.h" +#include "vcap_api.h" +#include "vcap_api_client.h" +#include "vcap_tc.h" + +static bool lan966x_tc_is_known_etype(u16 etype) +{ + switch (etype) { + case ETH_P_ALL: + case ETH_P_ARP: + case ETH_P_IP: + case ETH_P_IPV6: + return true; + } + + return false; +} + +static int +lan966x_tc_flower_handler_control_usage(struct vcap_tc_flower_parse_usage *st) +{ + struct flow_match_control match; + int err = 0; + + flow_rule_match_control(st->frule, &match); + if (match.mask->flags & FLOW_DIS_IS_FRAGMENT) { + if (match.key->flags & FLOW_DIS_IS_FRAGMENT) + err = vcap_rule_add_key_bit(st->vrule, + VCAP_KF_L3_FRAGMENT, + VCAP_BIT_1); + else + err = vcap_rule_add_key_bit(st->vrule, + VCAP_KF_L3_FRAGMENT, + VCAP_BIT_0); + if (err) + goto out; + } + + if (match.mask->flags & FLOW_DIS_FIRST_FRAG) { + if (match.key->flags & FLOW_DIS_FIRST_FRAG) + err = vcap_rule_add_key_bit(st->vrule, + VCAP_KF_L3_FRAG_OFS_GT0, + VCAP_BIT_0); + else + err = vcap_rule_add_key_bit(st->vrule, + VCAP_KF_L3_FRAG_OFS_GT0, + VCAP_BIT_1); + if (err) + goto out; + } + + st->used_keys |= BIT(FLOW_DISSECTOR_KEY_CONTROL); + + return err; + +out: + NL_SET_ERR_MSG_MOD(st->fco->common.extack, "ip_frag parse error"); + return err; +} + +static int +lan966x_tc_flower_handler_basic_usage(struct vcap_tc_flower_parse_usage *st) +{ + struct flow_match_basic match; + int err = 0; + + flow_rule_match_basic(st->frule, &match); + if (match.mask->n_proto) { + st->l3_proto = be16_to_cpu(match.key->n_proto); + if (!lan966x_tc_is_known_etype(st->l3_proto)) { + err = vcap_rule_add_key_u32(st->vrule, VCAP_KF_ETYPE, + st->l3_proto, ~0); + if (err) + goto out; + } else if (st->l3_proto == ETH_P_IP) { + err = vcap_rule_add_key_bit(st->vrule, VCAP_KF_IP4_IS, + VCAP_BIT_1); + if (err) + goto out; + } + } + if (match.mask->ip_proto) { + st->l4_proto = match.key->ip_proto; + + if (st->l4_proto == IPPROTO_TCP) { + err = vcap_rule_add_key_bit(st->vrule, + VCAP_KF_TCP_IS, + VCAP_BIT_1); + if (err) + goto out; + } else if (st->l4_proto == IPPROTO_UDP) { + err = vcap_rule_add_key_bit(st->vrule, + VCAP_KF_TCP_IS, + VCAP_BIT_0); + if (err) + goto out; + } else { + err = vcap_rule_add_key_u32(st->vrule, + VCAP_KF_L3_IP_PROTO, + st->l4_proto, ~0); + if (err) + goto out; + } + } + + st->used_keys |= BIT(FLOW_DISSECTOR_KEY_BASIC); + return err; +out: + NL_SET_ERR_MSG_MOD(st->fco->common.extack, "ip_proto parse error"); + return err; +} + +static int +lan966x_tc_flower_handler_vlan_usage(struct vcap_tc_flower_parse_usage *st) +{ + return vcap_tc_flower_handler_vlan_usage(st, + VCAP_KF_8021Q_VID_CLS, + VCAP_KF_8021Q_PCP_CLS); +} + +static int +(*lan966x_tc_flower_handlers_usage[])(struct vcap_tc_flower_parse_usage *st) = { + [FLOW_DISSECTOR_KEY_ETH_ADDRS] = vcap_tc_flower_handler_ethaddr_usage, + [FLOW_DISSECTOR_KEY_IPV4_ADDRS] = vcap_tc_flower_handler_ipv4_usage, + [FLOW_DISSECTOR_KEY_IPV6_ADDRS] = vcap_tc_flower_handler_ipv6_usage, + [FLOW_DISSECTOR_KEY_CONTROL] = lan966x_tc_flower_handler_control_usage, + [FLOW_DISSECTOR_KEY_PORTS] = vcap_tc_flower_handler_portnum_usage, + [FLOW_DISSECTOR_KEY_BASIC] = lan966x_tc_flower_handler_basic_usage, + [FLOW_DISSECTOR_KEY_VLAN] = lan966x_tc_flower_handler_vlan_usage, + [FLOW_DISSECTOR_KEY_TCP] = vcap_tc_flower_handler_tcp_usage, + [FLOW_DISSECTOR_KEY_ARP] = vcap_tc_flower_handler_arp_usage, + [FLOW_DISSECTOR_KEY_IP] = vcap_tc_flower_handler_ip_usage, +}; + +static int lan966x_tc_flower_use_dissectors(struct flow_cls_offload *f, + struct vcap_admin *admin, + struct vcap_rule *vrule, + u16 *l3_proto) +{ + struct vcap_tc_flower_parse_usage state = { + .fco = f, + .vrule = vrule, + .l3_proto = ETH_P_ALL, + }; + int err = 0; + + state.frule = flow_cls_offload_flow_rule(f); + for (int i = 0; i < ARRAY_SIZE(lan966x_tc_flower_handlers_usage); ++i) { + if (!flow_rule_match_key(state.frule, i) || + !lan966x_tc_flower_handlers_usage[i]) + continue; + + err = lan966x_tc_flower_handlers_usage[i](&state); + if (err) + return err; + } + + if (l3_proto) + *l3_proto = state.l3_proto; + + return err; +} + +static int lan966x_tc_flower_action_check(struct vcap_control *vctrl, + struct net_device *dev, + struct flow_cls_offload *fco, + bool ingress) +{ + struct flow_rule *rule = flow_cls_offload_flow_rule(fco); + struct flow_action_entry *actent, *last_actent = NULL; + struct flow_action *act = &rule->action; + u64 action_mask = 0; + int idx; + + if (!flow_action_has_entries(act)) { + NL_SET_ERR_MSG_MOD(fco->common.extack, "No actions"); + return -EINVAL; + } + + if (!flow_action_basic_hw_stats_check(act, fco->common.extack)) + return -EOPNOTSUPP; + + flow_action_for_each(idx, actent, act) { + if (action_mask & BIT(actent->id)) { + NL_SET_ERR_MSG_MOD(fco->common.extack, + "More actions of the same type"); + return -EINVAL; + } + action_mask |= BIT(actent->id); + last_actent = actent; /* Save last action for later check */ + } + + /* Check that last action is a goto + * The last chain/lookup does not need to have goto action + */ + if (last_actent->id == FLOW_ACTION_GOTO) { + /* Check if the destination chain is in one of the VCAPs */ + if (!vcap_is_next_lookup(vctrl, fco->common.chain_index, + last_actent->chain_index)) { + NL_SET_ERR_MSG_MOD(fco->common.extack, + "Invalid goto chain"); + return -EINVAL; + } + } else if (!vcap_is_last_chain(vctrl, fco->common.chain_index, + ingress)) { + NL_SET_ERR_MSG_MOD(fco->common.extack, + "Last action must be 'goto'"); + return -EINVAL; + } + + /* Catch unsupported combinations of actions */ + if (action_mask & BIT(FLOW_ACTION_TRAP) && + action_mask & BIT(FLOW_ACTION_ACCEPT)) { + NL_SET_ERR_MSG_MOD(fco->common.extack, + "Cannot combine pass and trap action"); + return -EOPNOTSUPP; + } + + return 0; +} + +static int lan966x_tc_flower_add(struct lan966x_port *port, + struct flow_cls_offload *f, + struct vcap_admin *admin, + bool ingress) +{ + struct flow_action_entry *act; + u16 l3_proto = ETH_P_ALL; + struct flow_rule *frule; + struct vcap_rule *vrule; + int err, idx; + + err = lan966x_tc_flower_action_check(port->lan966x->vcap_ctrl, + port->dev, f, ingress); + if (err) + return err; + + vrule = vcap_alloc_rule(port->lan966x->vcap_ctrl, port->dev, + f->common.chain_index, VCAP_USER_TC, + f->common.prio, 0); + if (IS_ERR(vrule)) + return PTR_ERR(vrule); + + vrule->cookie = f->cookie; + err = lan966x_tc_flower_use_dissectors(f, admin, vrule, &l3_proto); + if (err) + goto out; + + frule = flow_cls_offload_flow_rule(f); + + flow_action_for_each(idx, act, &frule->action) { + switch (act->id) { + case FLOW_ACTION_TRAP: + err = vcap_rule_add_action_bit(vrule, + VCAP_AF_CPU_COPY_ENA, + VCAP_BIT_1); + err |= vcap_rule_add_action_u32(vrule, + VCAP_AF_CPU_QUEUE_NUM, + 0); + err |= vcap_rule_add_action_u32(vrule, VCAP_AF_MASK_MODE, + LAN966X_PMM_REPLACE); + if (err) + goto out; + + break; + case FLOW_ACTION_GOTO: + break; + default: + NL_SET_ERR_MSG_MOD(f->common.extack, + "Unsupported TC action"); + err = -EOPNOTSUPP; + goto out; + } + } + + err = vcap_val_rule(vrule, l3_proto); + if (err) { + vcap_set_tc_exterr(f, vrule); + goto out; + } + + err = vcap_add_rule(vrule); + if (err) + NL_SET_ERR_MSG_MOD(f->common.extack, + "Could not add the filter"); +out: + vcap_free_rule(vrule); + return err; +} + +static int lan966x_tc_flower_del(struct lan966x_port *port, + struct flow_cls_offload *f, + struct vcap_admin *admin) +{ + struct vcap_control *vctrl; + int err = -ENOENT, rule_id; + + vctrl = port->lan966x->vcap_ctrl; + while (true) { + rule_id = vcap_lookup_rule_by_cookie(vctrl, f->cookie); + if (rule_id <= 0) + break; + + err = vcap_del_rule(vctrl, port->dev, rule_id); + if (err) { + NL_SET_ERR_MSG_MOD(f->common.extack, + "Cannot delete rule"); + break; + } + } + + return err; +} + +static int lan966x_tc_flower_stats(struct lan966x_port *port, + struct flow_cls_offload *f, + struct vcap_admin *admin) +{ + struct vcap_counter count = {}; + int err; + + err = vcap_get_rule_count_by_cookie(port->lan966x->vcap_ctrl, + &count, f->cookie); + if (err) + return err; + + flow_stats_update(&f->stats, 0x0, count.value, 0, 0, + FLOW_ACTION_HW_STATS_IMMEDIATE); + + return err; +} + +int lan966x_tc_flower(struct lan966x_port *port, + struct flow_cls_offload *f, + bool ingress) +{ + struct vcap_admin *admin; + + admin = vcap_find_admin(port->lan966x->vcap_ctrl, + f->common.chain_index); + if (!admin) { + NL_SET_ERR_MSG_MOD(f->common.extack, "Invalid chain"); + return -EINVAL; + } + + switch (f->command) { + case FLOW_CLS_REPLACE: + return lan966x_tc_flower_add(port, f, admin, ingress); + case FLOW_CLS_DESTROY: + return lan966x_tc_flower_del(port, f, admin); + case FLOW_CLS_STATS: + return lan966x_tc_flower_stats(port, f, admin); + default: + return -EOPNOTSUPP; + } + + return 0; +} |