1 // SPDX-License-Identifier: GPL-2.0 2 // Copyright (c) 2023 Pengutronix, Oleksij Rempel <kernel@pengutronix.de> 3 4 #include "ksz9477.h" 5 #include "ksz9477_reg.h" 6 #include "ksz_common.h" 7 8 #define ETHER_TYPE_FULL_MASK cpu_to_be16(~0) 9 #define KSZ9477_MAX_TC 7 10 11 /** 12 * ksz9477_flower_parse_key_l2 - Parse Layer 2 key from flow rule and configure 13 * ACL entries accordingly. 14 * @dev: Pointer to the ksz_device. 15 * @port: Port number. 16 * @extack: Pointer to the netlink_ext_ack. 17 * @rule: Pointer to the flow_rule. 18 * @cookie: The cookie to associate with the entry. 19 * @prio: The priority of the entry. 20 * 21 * This function parses the Layer 2 key from the flow rule and configures 22 * the corresponding ACL entries. It checks for unsupported offloads and 23 * available entries before proceeding with the configuration. 24 * 25 * Returns: 0 on success or a negative error code on failure. 26 */ 27 static int ksz9477_flower_parse_key_l2(struct ksz_device *dev, int port, 28 struct netlink_ext_ack *extack, 29 struct flow_rule *rule, 30 unsigned long cookie, u32 prio) 31 { 32 struct ksz9477_acl_priv *acl = dev->ports[port].acl_priv; 33 struct flow_match_eth_addrs ematch; 34 struct ksz9477_acl_entries *acles; 35 int required_entries; 36 u8 *src_mac = NULL; 37 u8 *dst_mac = NULL; 38 u16 ethtype = 0; 39 40 if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_BASIC)) { 41 struct flow_match_basic match; 42 43 flow_rule_match_basic(rule, &match); 44 45 if (match.key->n_proto) { 46 if (match.mask->n_proto != ETHER_TYPE_FULL_MASK) { 47 NL_SET_ERR_MSG_MOD(extack, 48 "ethernet type mask must be a full mask"); 49 return -EINVAL; 50 } 51 52 ethtype = be16_to_cpu(match.key->n_proto); 53 } 54 } 55 56 if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ETH_ADDRS)) { 57 flow_rule_match_eth_addrs(rule, &ematch); 58 59 if (!is_zero_ether_addr(ematch.key->src)) { 60 if (!is_broadcast_ether_addr(ematch.mask->src)) 61 goto not_full_mask_err; 62 63 src_mac = ematch.key->src; 64 } 65 66 if (!is_zero_ether_addr(ematch.key->dst)) { 67 if (!is_broadcast_ether_addr(ematch.mask->dst)) 68 goto not_full_mask_err; 69 70 dst_mac = ematch.key->dst; 71 } 72 } 73 74 acles = &acl->acles; 75 /* ACL supports only one MAC per entry */ 76 required_entries = src_mac && dst_mac ? 2 : 1; 77 78 /* Check if there are enough available entries */ 79 if (acles->entries_count + required_entries > KSZ9477_ACL_MAX_ENTRIES) { 80 NL_SET_ERR_MSG_MOD(extack, "ACL entry limit reached"); 81 return -EOPNOTSUPP; 82 } 83 84 ksz9477_acl_match_process_l2(dev, port, ethtype, src_mac, dst_mac, 85 cookie, prio); 86 87 return 0; 88 89 not_full_mask_err: 90 NL_SET_ERR_MSG_MOD(extack, "MAC address mask must be a full mask"); 91 return -EOPNOTSUPP; 92 } 93 94 /** 95 * ksz9477_flower_parse_key - Parse flow rule keys for a specified port on a 96 * ksz_device. 97 * @dev: The ksz_device instance. 98 * @port: The port number to parse the flow rule keys for. 99 * @extack: The netlink extended ACK for reporting errors. 100 * @rule: The flow_rule to parse. 101 * @cookie: The cookie to associate with the entry. 102 * @prio: The priority of the entry. 103 * 104 * This function checks if the used keys in the flow rule are supported by 105 * the device and parses the L2 keys if they match. If unsupported keys are 106 * used, an error message is set in the extended ACK. 107 * 108 * Returns: 0 on success or a negative error code on failure. 109 */ 110 static int ksz9477_flower_parse_key(struct ksz_device *dev, int port, 111 struct netlink_ext_ack *extack, 112 struct flow_rule *rule, 113 unsigned long cookie, u32 prio) 114 { 115 struct flow_dissector *dissector = rule->match.dissector; 116 int ret; 117 118 if (dissector->used_keys & 119 ~(BIT_ULL(FLOW_DISSECTOR_KEY_BASIC) | 120 BIT_ULL(FLOW_DISSECTOR_KEY_ETH_ADDRS) | 121 BIT_ULL(FLOW_DISSECTOR_KEY_CONTROL))) { 122 NL_SET_ERR_MSG_MOD(extack, 123 "Unsupported keys used"); 124 return -EOPNOTSUPP; 125 } 126 127 if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_BASIC) || 128 flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ETH_ADDRS)) { 129 ret = ksz9477_flower_parse_key_l2(dev, port, extack, rule, 130 cookie, prio); 131 if (ret) 132 return ret; 133 } 134 135 return 0; 136 } 137 138 /** 139 * ksz9477_flower_parse_action - Parse flow rule actions for a specified port 140 * on a ksz_device. 141 * @dev: The ksz_device instance. 142 * @port: The port number to parse the flow rule actions for. 143 * @extack: The netlink extended ACK for reporting errors. 144 * @cls: The flow_cls_offload instance containing the flow rule. 145 * @entry_idx: The index of the ACL entry to store the action. 146 * 147 * This function checks if the actions in the flow rule are supported by 148 * the device. Currently, only actions that change priorities are supported. 149 * If unsupported actions are encountered, an error message is set in the 150 * extended ACK. 151 * 152 * Returns: 0 on success or a negative error code on failure. 153 */ 154 static int ksz9477_flower_parse_action(struct ksz_device *dev, int port, 155 struct netlink_ext_ack *extack, 156 struct flow_cls_offload *cls, 157 int entry_idx) 158 { 159 struct flow_rule *rule = flow_cls_offload_flow_rule(cls); 160 struct ksz9477_acl_priv *acl = dev->ports[port].acl_priv; 161 const struct flow_action_entry *act; 162 struct ksz9477_acl_entry *entry; 163 bool prio_force = false; 164 u8 prio_val = 0; 165 int i; 166 167 if (TC_H_MIN(cls->classid)) { 168 NL_SET_ERR_MSG_MOD(extack, "hw_tc is not supported. Use: action skbedit prio"); 169 return -EOPNOTSUPP; 170 } 171 172 flow_action_for_each(i, act, &rule->action) { 173 switch (act->id) { 174 case FLOW_ACTION_PRIORITY: 175 if (act->priority > KSZ9477_MAX_TC) { 176 NL_SET_ERR_MSG_MOD(extack, "Priority value is too high"); 177 return -EOPNOTSUPP; 178 } 179 prio_force = true; 180 prio_val = act->priority; 181 break; 182 default: 183 NL_SET_ERR_MSG_MOD(extack, "action not supported"); 184 return -EOPNOTSUPP; 185 } 186 } 187 188 /* pick entry to store action */ 189 entry = &acl->acles.entries[entry_idx]; 190 191 ksz9477_acl_action_rule_cfg(entry->entry, prio_force, prio_val); 192 ksz9477_acl_processing_rule_set_action(entry->entry, entry_idx); 193 194 return 0; 195 } 196 197 /** 198 * ksz9477_cls_flower_add - Add a flow classification rule for a specified port 199 * on a ksz_device. 200 * @ds: The DSA switch instance. 201 * @port: The port number to add the flow classification rule to. 202 * @cls: The flow_cls_offload instance containing the flow rule. 203 * @ingress: A flag indicating if the rule is applied on the ingress path. 204 * 205 * This function adds a flow classification rule for a specified port on a 206 * ksz_device. It checks if the ACL offloading is supported and parses the flow 207 * keys and actions. If the ACL is not supported, it returns an error. If there 208 * are unprocessed entries, it parses the action for the rule. 209 * 210 * Returns: 0 on success or a negative error code on failure. 211 */ 212 int ksz9477_cls_flower_add(struct dsa_switch *ds, int port, 213 struct flow_cls_offload *cls, bool ingress) 214 { 215 struct flow_rule *rule = flow_cls_offload_flow_rule(cls); 216 struct netlink_ext_ack *extack = cls->common.extack; 217 struct ksz_device *dev = ds->priv; 218 struct ksz9477_acl_priv *acl; 219 int action_entry_idx; 220 int ret; 221 222 acl = dev->ports[port].acl_priv; 223 224 if (!acl) { 225 NL_SET_ERR_MSG_MOD(extack, "ACL offloading is not supported"); 226 return -EOPNOTSUPP; 227 } 228 229 /* A complex rule set can take multiple entries. Use first entry 230 * to store the action. 231 */ 232 action_entry_idx = acl->acles.entries_count; 233 234 ret = ksz9477_flower_parse_key(dev, port, extack, rule, cls->cookie, 235 cls->common.prio); 236 if (ret) 237 return ret; 238 239 ret = ksz9477_flower_parse_action(dev, port, extack, cls, 240 action_entry_idx); 241 if (ret) 242 return ret; 243 244 ret = ksz9477_sort_acl_entries(dev, port); 245 if (ret) 246 return ret; 247 248 return ksz9477_acl_write_list(dev, port); 249 } 250 251 /** 252 * ksz9477_cls_flower_del - Remove a flow classification rule for a specified 253 * port on a ksz_device. 254 * @ds: The DSA switch instance. 255 * @port: The port number to remove the flow classification rule from. 256 * @cls: The flow_cls_offload instance containing the flow rule. 257 * @ingress: A flag indicating if the rule is applied on the ingress path. 258 * 259 * This function removes a flow classification rule for a specified port on a 260 * ksz_device. It checks if the ACL is initialized, and if not, returns an 261 * error. If the ACL is initialized, it removes entries with the specified 262 * cookie and rewrites the ACL list. 263 * 264 * Returns: 0 on success or a negative error code on failure. 265 */ 266 int ksz9477_cls_flower_del(struct dsa_switch *ds, int port, 267 struct flow_cls_offload *cls, bool ingress) 268 { 269 unsigned long cookie = cls->cookie; 270 struct ksz_device *dev = ds->priv; 271 struct ksz9477_acl_priv *acl; 272 273 acl = dev->ports[port].acl_priv; 274 275 if (!acl) 276 return -EOPNOTSUPP; 277 278 ksz9477_acl_remove_entries(dev, port, &acl->acles, cookie); 279 280 return ksz9477_acl_write_list(dev, port); 281 } 282