1// SPDX-License-Identifier: GPL-2.0+
  2/* Microchip Sparx5 Switch driver
  3 *
  4 * Copyright (c) 2022 Microchip Technology Inc. and its subsidiaries.
  5 */
  6
  7#include <net/dcbnl.h>
  8
  9#include "sparx5_port.h"
 10
 11enum sparx5_dcb_apptrust_values {
 12	SPARX5_DCB_APPTRUST_EMPTY,
 13	SPARX5_DCB_APPTRUST_DSCP,
 14	SPARX5_DCB_APPTRUST_PCP,
 15	SPARX5_DCB_APPTRUST_DSCP_PCP,
 16	__SPARX5_DCB_APPTRUST_MAX
 17};
 18
 19static const struct sparx5_dcb_apptrust {
 20	u8 selectors[IEEE_8021QAZ_APP_SEL_MAX + 1];
 21	int nselectors;
 22} *sparx5_port_apptrust[SPX5_PORTS];
 23
 24static const char *sparx5_dcb_apptrust_names[__SPARX5_DCB_APPTRUST_MAX] = {
 25	[SPARX5_DCB_APPTRUST_EMPTY]    = "empty",
 26	[SPARX5_DCB_APPTRUST_DSCP]     = "dscp",
 27	[SPARX5_DCB_APPTRUST_PCP]      = "pcp",
 28	[SPARX5_DCB_APPTRUST_DSCP_PCP] = "dscp pcp"
 29};
 30
 31/* Sparx5 supported apptrust policies */
 32static const struct sparx5_dcb_apptrust
 33	sparx5_dcb_apptrust_policies[__SPARX5_DCB_APPTRUST_MAX] = {
 34	/* Empty *must* be first */
 35	[SPARX5_DCB_APPTRUST_EMPTY]    = { { 0 }, 0 },
 36	[SPARX5_DCB_APPTRUST_DSCP]     = { { IEEE_8021QAZ_APP_SEL_DSCP }, 1 },
 37	[SPARX5_DCB_APPTRUST_PCP]      = { { DCB_APP_SEL_PCP }, 1 },
 38	[SPARX5_DCB_APPTRUST_DSCP_PCP] = { { IEEE_8021QAZ_APP_SEL_DSCP,
 39					     DCB_APP_SEL_PCP }, 2 },
 40};
 41
 42/* Validate app entry.
 43 *
 44 * Check for valid selectors and valid protocol and priority ranges.
 45 */
 46static int sparx5_dcb_app_validate(struct net_device *dev,
 47				   const struct dcb_app *app)
 48{
 49	int err = 0;
 50
 51	switch (app->selector) {
 52	/* Default priority checks */
 53	case IEEE_8021QAZ_APP_SEL_ETHERTYPE:
 54		if (app->protocol != 0)
 55			err = -EINVAL;
 56		else if (app->priority >= SPX5_PRIOS)
 57			err = -ERANGE;
 58		break;
 59	/* Dscp checks */
 60	case IEEE_8021QAZ_APP_SEL_DSCP:
 61		if (app->protocol >= SPARX5_PORT_QOS_DSCP_COUNT)
 62			err = -EINVAL;
 63		else if (app->priority >= SPX5_PRIOS)
 64			err = -ERANGE;
 65		break;
 66	/* Pcp checks */
 67	case DCB_APP_SEL_PCP:
 68		if (app->protocol >= SPARX5_PORT_QOS_PCP_DEI_COUNT)
 69			err = -EINVAL;
 70		else if (app->priority >= SPX5_PRIOS)
 71			err = -ERANGE;
 72		break;
 73	default:
 74		err = -EINVAL;
 75		break;
 76	}
 77
 78	if (err)
 79		netdev_err(dev, "Invalid entry: %d:%d\n", app->protocol,
 80			   app->priority);
 81
 82	return err;
 83}
 84
 85/* Validate apptrust configuration.
 86 *
 87 * Return index of supported apptrust configuration if valid, otherwise return
 88 * error.
 89 */
 90static int sparx5_dcb_apptrust_validate(struct net_device *dev, u8 *selectors,
 91					int nselectors, int *err)
 92{
 93	bool match = false;
 94	int i, ii;
 95
 96	for (i = 0; i < ARRAY_SIZE(sparx5_dcb_apptrust_policies); i++) {
 97		if (sparx5_dcb_apptrust_policies[i].nselectors != nselectors)
 98			continue;
 99		match = true;
100		for (ii = 0; ii < nselectors; ii++) {
101			if (sparx5_dcb_apptrust_policies[i].selectors[ii] !=
102			    *(selectors + ii)) {
103				match = false;
104				break;
105			}
106		}
107		if (match)
108			break;
109	}
110
111	/* Requested trust configuration is not supported */
112	if (!match) {
113		netdev_err(dev, "Valid apptrust configurations are:\n");
114		for (i = 0; i < ARRAY_SIZE(sparx5_dcb_apptrust_names); i++)
115			pr_info("order: %s\n", sparx5_dcb_apptrust_names[i]);
116		*err = -EOPNOTSUPP;
117	}
118
119	return i;
120}
121
122static bool sparx5_dcb_apptrust_contains(int portno, u8 selector)
123{
124	const struct sparx5_dcb_apptrust *conf = sparx5_port_apptrust[portno];
125	int i;
126
127	for (i = 0; i < conf->nselectors; i++)
128		if (conf->selectors[i] == selector)
129			return true;
130
131	return false;
132}
133
134static int sparx5_dcb_app_update(struct net_device *dev)
135{
136	struct dcb_ieee_app_prio_map dscp_rewr_map = {0};
137	struct dcb_rewr_prio_pcp_map pcp_rewr_map = {0};
138	struct sparx5_port *port = netdev_priv(dev);
139	struct sparx5_port_qos_dscp_map *dscp_map;
140	struct sparx5_port_qos_pcp_map *pcp_map;
141	struct sparx5_port_qos qos = {0};
142	struct dcb_app app_itr = {0};
143	int portno = port->portno;
144	bool dscp_rewr = false;
145	bool pcp_rewr = false;
146	u16 dscp;
147	int i;
148
149	dscp_map = &qos.dscp.map;
150	pcp_map = &qos.pcp.map;
151
152	/* Get default prio. */
153	qos.default_prio = dcb_ieee_getapp_default_prio_mask(dev);
154	if (qos.default_prio)
155		qos.default_prio = fls(qos.default_prio) - 1;
156
157	/* Get dscp ingress mapping */
158	for (i = 0; i < ARRAY_SIZE(dscp_map->map); i++) {
159		app_itr.selector = IEEE_8021QAZ_APP_SEL_DSCP;
160		app_itr.protocol = i;
161		dscp_map->map[i] = dcb_getapp(dev, &app_itr);
162	}
163
164	/* Get pcp ingress mapping */
165	for (i = 0; i < ARRAY_SIZE(pcp_map->map); i++) {
166		app_itr.selector = DCB_APP_SEL_PCP;
167		app_itr.protocol = i;
168		pcp_map->map[i] = dcb_getapp(dev, &app_itr);
169	}
170
171	/* Get pcp rewrite mapping */
172	dcb_getrewr_prio_pcp_mask_map(dev, &pcp_rewr_map);
173	for (i = 0; i < ARRAY_SIZE(pcp_rewr_map.map); i++) {
174		if (!pcp_rewr_map.map[i])
175			continue;
176		pcp_rewr = true;
177		qos.pcp_rewr.map.map[i] = fls(pcp_rewr_map.map[i]) - 1;
178	}
179
180	/* Get dscp rewrite mapping */
181	dcb_getrewr_prio_dscp_mask_map(dev, &dscp_rewr_map);
182	for (i = 0; i < ARRAY_SIZE(dscp_rewr_map.map); i++) {
183		if (!dscp_rewr_map.map[i])
184			continue;
185
186		/* The rewrite table of the switch has 32 entries; one for each
187		 * priority for each DP level. Currently, the rewrite map does
188		 * not indicate DP level, so we map classified QoS class to
189		 * classified DSCP, for each classified DP level. Rewrite of
190		 * DSCP is only enabled, if we have active mappings.
191		 */
192		dscp_rewr = true;
193		dscp = fls64(dscp_rewr_map.map[i]) - 1;
194		qos.dscp_rewr.map.map[i] = dscp;      /* DP 0 */
195		qos.dscp_rewr.map.map[i + 8] = dscp;  /* DP 1 */
196		qos.dscp_rewr.map.map[i + 16] = dscp; /* DP 2 */
197		qos.dscp_rewr.map.map[i + 24] = dscp; /* DP 3 */
198	}
199
200	/* Enable use of pcp for queue classification ? */
201	if (sparx5_dcb_apptrust_contains(portno, DCB_APP_SEL_PCP)) {
202		qos.pcp.qos_enable = true;
203		qos.pcp.dp_enable = qos.pcp.qos_enable;
204		/* Enable rewrite of PCP and DEI if PCP is trusted *and* rewrite
205		 * table is not empty.
206		 */
207		if (pcp_rewr)
208			qos.pcp_rewr.enable = true;
209	}
210
211	/* Enable use of dscp for queue classification ? */
212	if (sparx5_dcb_apptrust_contains(portno, IEEE_8021QAZ_APP_SEL_DSCP)) {
213		qos.dscp.qos_enable = true;
214		qos.dscp.dp_enable = qos.dscp.qos_enable;
215		if (dscp_rewr)
216			/* Do not enable rewrite if no mappings are active, as
217			 * classified DSCP will then be zero for all classified
218			 * QoS class and DP combinations.
219			 */
220			qos.dscp_rewr.enable = true;
221	}
222
223	return sparx5_port_qos_set(port, &qos);
224}
225
226/* Set or delete DSCP app entry.
227 *
228 * DSCP mapping is global for all ports, so set and delete app entries are
229 * replicated for each port.
230 */
231static int sparx5_dcb_ieee_dscp_setdel(struct net_device *dev,
232				       struct dcb_app *app,
233				       int (*setdel)(struct net_device *,
234						     struct dcb_app *))
235{
236	struct sparx5_port *port = netdev_priv(dev);
237	struct sparx5 *sparx5 = port->sparx5;
238	struct sparx5_port *port_itr;
239	int err, i;
240
241	for (i = 0; i < sparx5->data->consts->n_ports; i++) {
242		port_itr = port->sparx5->ports[i];
243		if (!port_itr)
244			continue;
245		err = setdel(port_itr->ndev, app);
246		if (err)
247			return err;
248	}
249
250	return 0;
251}
252
253static int sparx5_dcb_ieee_delapp(struct net_device *dev, struct dcb_app *app)
254{
255	int err;
256
257	if (app->selector == IEEE_8021QAZ_APP_SEL_DSCP)
258		err = sparx5_dcb_ieee_dscp_setdel(dev, app, dcb_ieee_delapp);
259	else
260		err = dcb_ieee_delapp(dev, app);
261
262	if (err < 0)
263		return err;
264
265	return sparx5_dcb_app_update(dev);
266}
267
268static int sparx5_dcb_ieee_setapp(struct net_device *dev, struct dcb_app *app)
269{
270	struct dcb_app app_itr;
271	int err = 0;
272	u8 prio;
273
274	err = sparx5_dcb_app_validate(dev, app);
275	if (err)
276		goto out;
277
278	/* Delete current mapping, if it exists */
279	prio = dcb_getapp(dev, app);
280	if (prio) {
281		app_itr = *app;
282		app_itr.priority = prio;
283		sparx5_dcb_ieee_delapp(dev, &app_itr);
284	}
285
286	if (app->selector == IEEE_8021QAZ_APP_SEL_DSCP)
287		err = sparx5_dcb_ieee_dscp_setdel(dev, app, dcb_ieee_setapp);
288	else
289		err = dcb_ieee_setapp(dev, app);
290
291	if (err)
292		goto out;
293
294	sparx5_dcb_app_update(dev);
295
296out:
297	return err;
298}
299
300static int sparx5_dcb_setapptrust(struct net_device *dev, u8 *selectors,
301				  int nselectors)
302{
303	struct sparx5_port *port = netdev_priv(dev);
304	int err = 0, idx;
305
306	idx = sparx5_dcb_apptrust_validate(dev, selectors, nselectors, &err);
307	if (err < 0)
308		return err;
309
310	sparx5_port_apptrust[port->portno] = &sparx5_dcb_apptrust_policies[idx];
311
312	return sparx5_dcb_app_update(dev);
313}
314
315static int sparx5_dcb_getapptrust(struct net_device *dev, u8 *selectors,
316				  int *nselectors)
317{
318	struct sparx5_port *port = netdev_priv(dev);
319	const struct sparx5_dcb_apptrust *trust;
320
321	trust = sparx5_port_apptrust[port->portno];
322
323	memcpy(selectors, trust->selectors, trust->nselectors);
324	*nselectors = trust->nselectors;
325
326	return 0;
327}
328
329static int sparx5_dcb_delrewr(struct net_device *dev, struct dcb_app *app)
330{
331	int err;
332
333	if (app->selector == IEEE_8021QAZ_APP_SEL_DSCP)
334		err = sparx5_dcb_ieee_dscp_setdel(dev, app, dcb_delrewr);
335	else
336		err = dcb_delrewr(dev, app);
337
338	if (err < 0)
339		return err;
340
341	return sparx5_dcb_app_update(dev);
342}
343
344static int sparx5_dcb_setrewr(struct net_device *dev, struct dcb_app *app)
345{
346	struct dcb_app app_itr;
347	int err = 0;
348	u16 proto;
349
350	err = sparx5_dcb_app_validate(dev, app);
351	if (err)
352		goto out;
353
354	/* Delete current mapping, if it exists. */
355	proto = dcb_getrewr(dev, app);
356	if (proto) {
357		app_itr = *app;
358		app_itr.protocol = proto;
359		sparx5_dcb_delrewr(dev, &app_itr);
360	}
361
362	if (app->selector == IEEE_8021QAZ_APP_SEL_DSCP)
363		err = sparx5_dcb_ieee_dscp_setdel(dev, app, dcb_setrewr);
364	else
365		err = dcb_setrewr(dev, app);
366
367	if (err)
368		goto out;
369
370	sparx5_dcb_app_update(dev);
371
372out:
373	return err;
374}
375
376const struct dcbnl_rtnl_ops sparx5_dcbnl_ops = {
377	.ieee_setapp = sparx5_dcb_ieee_setapp,
378	.ieee_delapp = sparx5_dcb_ieee_delapp,
379	.dcbnl_setapptrust = sparx5_dcb_setapptrust,
380	.dcbnl_getapptrust = sparx5_dcb_getapptrust,
381	.dcbnl_setrewr = sparx5_dcb_setrewr,
382	.dcbnl_delrewr = sparx5_dcb_delrewr,
383};
384
385int sparx5_dcb_init(struct sparx5 *sparx5)
386{
387	struct sparx5_port *port;
388	int i;
389
390	for (i = 0; i < sparx5->data->consts->n_ports; i++) {
391		port = sparx5->ports[i];
392		if (!port)
393			continue;
394		port->ndev->dcbnl_ops = &sparx5_dcbnl_ops;
395		/* Initialize [dscp, pcp] default trust */
396		sparx5_port_apptrust[port->portno] =
397			&sparx5_dcb_apptrust_policies
398				[SPARX5_DCB_APPTRUST_DSCP_PCP];
399
400		/* Enable DSCP classification based on classified QoS class and
401		 * DP, for all DSCP values, for all ports.
402		 */
403		sparx5_port_qos_dscp_rewr_mode_set(port,
404						   SPARX5_PORT_REW_DSCP_ALL);
405	}
406
407	return 0;
408}