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 */
27static 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, key: FLOW_DISSECTOR_KEY_BASIC)) {
41 struct flow_match_basic match;
42
43 flow_rule_match_basic(rule, out: &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, key: FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
57 flow_rule_match_eth_addrs(rule, out: &ematch);
58
59 if (!is_zero_ether_addr(addr: ematch.key->src)) {
60 if (!is_broadcast_ether_addr(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(addr: ematch.key->dst)) {
67 if (!is_broadcast_ether_addr(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
89not_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 */
110static 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, key: FLOW_DISSECTOR_KEY_BASIC) ||
128 flow_rule_match_key(rule, key: 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 */
154static 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(flow_cmd: 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->entry, force_prio: prio_force, prio_val);
192 ksz9477_acl_processing_rule_set_action(entry: entry->entry, action_idx: 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 */
212int 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(flow_cmd: 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, cookie: cls->cookie,
235 prio: cls->common.prio);
236 if (ret)
237 return ret;
238
239 ret = ksz9477_flower_parse_action(dev, port, extack, cls,
240 entry_idx: 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 */
266int 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, acles: &acl->acles, cookie);
279
280 return ksz9477_acl_write_list(dev, port);
281}
282

source code of linux/drivers/net/dsa/microchip/ksz9477_tc_flower.c