1 // SPDX-License-Identifier: (GPL-2.0 OR MIT)
2 /* Microsemi Ocelot Switch driver
3  *
4  * Copyright (c) 2017, 2019 Microsemi Corporation
5  * Copyright 2020-2021 NXP
6  */
7 
8 #include <linux/if_bridge.h>
9 #include <linux/mrp_bridge.h>
10 #include <soc/mscc/ocelot_vcap.h>
11 #include <uapi/linux/mrp_bridge.h>
12 #include "ocelot.h"
13 #include "ocelot_vcap.h"
14 
15 static const u8 mrp_test_dmac[] = { 0x01, 0x15, 0x4e, 0x00, 0x00, 0x01 };
16 static const u8 mrp_control_dmac[] = { 0x01, 0x15, 0x4e, 0x00, 0x00, 0x02 };
17 
ocelot_mrp_find_partner_port(struct ocelot * ocelot,struct ocelot_port * p)18 static int ocelot_mrp_find_partner_port(struct ocelot *ocelot,
19 					struct ocelot_port *p)
20 {
21 	int i;
22 
23 	for (i = 0; i < ocelot->num_phys_ports; ++i) {
24 		struct ocelot_port *ocelot_port = ocelot->ports[i];
25 
26 		if (!ocelot_port || p == ocelot_port)
27 			continue;
28 
29 		if (ocelot_port->mrp_ring_id == p->mrp_ring_id)
30 			return i;
31 	}
32 
33 	return -1;
34 }
35 
ocelot_mrp_del_vcap(struct ocelot * ocelot,int id)36 static int ocelot_mrp_del_vcap(struct ocelot *ocelot, int id)
37 {
38 	struct ocelot_vcap_block *block_vcap_is2;
39 	struct ocelot_vcap_filter *filter;
40 
41 	block_vcap_is2 = &ocelot->block[VCAP_IS2];
42 	filter = ocelot_vcap_block_find_filter_by_id(block_vcap_is2, id,
43 						     false);
44 	if (!filter)
45 		return 0;
46 
47 	return ocelot_vcap_filter_del(ocelot, filter);
48 }
49 
ocelot_mrp_redirect_add_vcap(struct ocelot * ocelot,int src_port,int dst_port)50 static int ocelot_mrp_redirect_add_vcap(struct ocelot *ocelot, int src_port,
51 					int dst_port)
52 {
53 	const u8 mrp_test_mask[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
54 	struct ocelot_vcap_filter *filter;
55 	int err;
56 
57 	filter = kzalloc(sizeof(*filter), GFP_KERNEL);
58 	if (!filter)
59 		return -ENOMEM;
60 
61 	filter->key_type = OCELOT_VCAP_KEY_ETYPE;
62 	filter->prio = 1;
63 	filter->id.cookie = OCELOT_VCAP_IS2_MRP_REDIRECT(ocelot, src_port);
64 	filter->id.tc_offload = false;
65 	filter->block_id = VCAP_IS2;
66 	filter->type = OCELOT_VCAP_FILTER_OFFLOAD;
67 	filter->ingress_port_mask = BIT(src_port);
68 	ether_addr_copy(filter->key.etype.dmac.value, mrp_test_dmac);
69 	ether_addr_copy(filter->key.etype.dmac.mask, mrp_test_mask);
70 	filter->action.mask_mode = OCELOT_MASK_MODE_REDIRECT;
71 	filter->action.port_mask = BIT(dst_port);
72 
73 	err = ocelot_vcap_filter_add(ocelot, filter, NULL);
74 	if (err)
75 		kfree(filter);
76 
77 	return err;
78 }
79 
ocelot_populate_mrp_trap_key(struct ocelot_vcap_filter * filter)80 static void ocelot_populate_mrp_trap_key(struct ocelot_vcap_filter *filter)
81 {
82 	const u8 mrp_mask[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 };
83 
84 	/* Here is possible to use control or test dmac because the mask
85 	 * doesn't cover the LSB
86 	 */
87 	ether_addr_copy(filter->key.etype.dmac.value, mrp_test_dmac);
88 	ether_addr_copy(filter->key.etype.dmac.mask, mrp_mask);
89 }
90 
ocelot_mrp_trap_add(struct ocelot * ocelot,int port)91 static int ocelot_mrp_trap_add(struct ocelot *ocelot, int port)
92 {
93 	unsigned long cookie = OCELOT_VCAP_IS2_MRP_TRAP(ocelot);
94 
95 	return ocelot_trap_add(ocelot, port, cookie, false,
96 			       ocelot_populate_mrp_trap_key);
97 }
98 
ocelot_mrp_trap_del(struct ocelot * ocelot,int port)99 static int ocelot_mrp_trap_del(struct ocelot *ocelot, int port)
100 {
101 	unsigned long cookie = OCELOT_VCAP_IS2_MRP_TRAP(ocelot);
102 
103 	return ocelot_trap_del(ocelot, port, cookie);
104 }
105 
ocelot_mrp_save_mac(struct ocelot * ocelot,struct ocelot_port * port)106 static void ocelot_mrp_save_mac(struct ocelot *ocelot,
107 				struct ocelot_port *port)
108 {
109 	ocelot_mact_learn(ocelot, PGID_BLACKHOLE, mrp_test_dmac,
110 			  OCELOT_STANDALONE_PVID, ENTRYTYPE_LOCKED);
111 	ocelot_mact_learn(ocelot, PGID_BLACKHOLE, mrp_control_dmac,
112 			  OCELOT_STANDALONE_PVID, ENTRYTYPE_LOCKED);
113 }
114 
ocelot_mrp_del_mac(struct ocelot * ocelot,struct ocelot_port * port)115 static void ocelot_mrp_del_mac(struct ocelot *ocelot,
116 			       struct ocelot_port *port)
117 {
118 	ocelot_mact_forget(ocelot, mrp_test_dmac, OCELOT_STANDALONE_PVID);
119 	ocelot_mact_forget(ocelot, mrp_control_dmac, OCELOT_STANDALONE_PVID);
120 }
121 
ocelot_mrp_add(struct ocelot * ocelot,int port,const struct switchdev_obj_mrp * mrp)122 int ocelot_mrp_add(struct ocelot *ocelot, int port,
123 		   const struct switchdev_obj_mrp *mrp)
124 {
125 	struct ocelot_port *ocelot_port = ocelot->ports[port];
126 	struct ocelot_port_private *priv;
127 	struct net_device *dev;
128 
129 	if (!ocelot_port)
130 		return -EOPNOTSUPP;
131 
132 	priv = container_of(ocelot_port, struct ocelot_port_private, port);
133 	dev = priv->dev;
134 
135 	if (mrp->p_port != dev && mrp->s_port != dev)
136 		return 0;
137 
138 	ocelot_port->mrp_ring_id = mrp->ring_id;
139 
140 	return 0;
141 }
142 EXPORT_SYMBOL(ocelot_mrp_add);
143 
ocelot_mrp_del(struct ocelot * ocelot,int port,const struct switchdev_obj_mrp * mrp)144 int ocelot_mrp_del(struct ocelot *ocelot, int port,
145 		   const struct switchdev_obj_mrp *mrp)
146 {
147 	struct ocelot_port *ocelot_port = ocelot->ports[port];
148 
149 	if (!ocelot_port)
150 		return -EOPNOTSUPP;
151 
152 	if (ocelot_port->mrp_ring_id != mrp->ring_id)
153 		return 0;
154 
155 	ocelot_port->mrp_ring_id = 0;
156 
157 	return 0;
158 }
159 EXPORT_SYMBOL(ocelot_mrp_del);
160 
ocelot_mrp_add_ring_role(struct ocelot * ocelot,int port,const struct switchdev_obj_ring_role_mrp * mrp)161 int ocelot_mrp_add_ring_role(struct ocelot *ocelot, int port,
162 			     const struct switchdev_obj_ring_role_mrp *mrp)
163 {
164 	struct ocelot_port *ocelot_port = ocelot->ports[port];
165 	int dst_port;
166 	int err;
167 
168 	if (!ocelot_port)
169 		return -EOPNOTSUPP;
170 
171 	if (mrp->ring_role != BR_MRP_RING_ROLE_MRC && !mrp->sw_backup)
172 		return -EOPNOTSUPP;
173 
174 	if (ocelot_port->mrp_ring_id != mrp->ring_id)
175 		return 0;
176 
177 	ocelot_mrp_save_mac(ocelot, ocelot_port);
178 
179 	if (mrp->ring_role != BR_MRP_RING_ROLE_MRC)
180 		return ocelot_mrp_trap_add(ocelot, port);
181 
182 	dst_port = ocelot_mrp_find_partner_port(ocelot, ocelot_port);
183 	if (dst_port == -1)
184 		return -EINVAL;
185 
186 	err = ocelot_mrp_redirect_add_vcap(ocelot, port, dst_port);
187 	if (err)
188 		return err;
189 
190 	err = ocelot_mrp_trap_add(ocelot, port);
191 	if (err) {
192 		ocelot_mrp_del_vcap(ocelot,
193 				    OCELOT_VCAP_IS2_MRP_REDIRECT(ocelot, port));
194 		return err;
195 	}
196 
197 	return 0;
198 }
199 EXPORT_SYMBOL(ocelot_mrp_add_ring_role);
200 
ocelot_mrp_del_ring_role(struct ocelot * ocelot,int port,const struct switchdev_obj_ring_role_mrp * mrp)201 int ocelot_mrp_del_ring_role(struct ocelot *ocelot, int port,
202 			     const struct switchdev_obj_ring_role_mrp *mrp)
203 {
204 	struct ocelot_port *ocelot_port = ocelot->ports[port];
205 	int err, i;
206 
207 	if (!ocelot_port)
208 		return -EOPNOTSUPP;
209 
210 	if (mrp->ring_role != BR_MRP_RING_ROLE_MRC && !mrp->sw_backup)
211 		return -EOPNOTSUPP;
212 
213 	if (ocelot_port->mrp_ring_id != mrp->ring_id)
214 		return 0;
215 
216 	err = ocelot_mrp_trap_del(ocelot, port);
217 	if (err)
218 		return err;
219 
220 	ocelot_mrp_del_vcap(ocelot, OCELOT_VCAP_IS2_MRP_REDIRECT(ocelot, port));
221 
222 	for (i = 0; i < ocelot->num_phys_ports; ++i) {
223 		ocelot_port = ocelot->ports[i];
224 
225 		if (!ocelot_port)
226 			continue;
227 
228 		if (ocelot_port->mrp_ring_id != 0)
229 			goto out;
230 	}
231 
232 	ocelot_mrp_del_mac(ocelot, ocelot->ports[port]);
233 out:
234 	return 0;
235 }
236 EXPORT_SYMBOL(ocelot_mrp_del_ring_role);
237