1 // SPDX-License-Identifier: (GPL-2.0 OR MIT)
2 /* Copyright 2020-2021 NXP
3  */
4 #include <net/devlink.h>
5 #include "ocelot.h"
6 
7 /* The queue system tracks four resource consumptions:
8  * Resource 0: Memory tracked per source port
9  * Resource 1: Frame references tracked per source port
10  * Resource 2: Memory tracked per destination port
11  * Resource 3: Frame references tracked per destination port
12  */
13 #define OCELOT_RESOURCE_SZ		256
14 #define OCELOT_NUM_RESOURCES		4
15 
16 #define BUF_xxxx_I			(0 * OCELOT_RESOURCE_SZ)
17 #define REF_xxxx_I			(1 * OCELOT_RESOURCE_SZ)
18 #define BUF_xxxx_E			(2 * OCELOT_RESOURCE_SZ)
19 #define REF_xxxx_E			(3 * OCELOT_RESOURCE_SZ)
20 
21 /* For each resource type there are 4 types of watermarks:
22  * Q_RSRV: reservation per QoS class per port
23  * PRIO_SHR: sharing watermark per QoS class across all ports
24  * P_RSRV: reservation per port
25  * COL_SHR: sharing watermark per color (drop precedence) across all ports
26  */
27 #define xxx_Q_RSRV_x			0
28 #define xxx_PRIO_SHR_x			216
29 #define xxx_P_RSRV_x			224
30 #define xxx_COL_SHR_x			254
31 
32 /* Reservation Watermarks
33  * ----------------------
34  *
35  * For setting up the reserved areas, egress watermarks exist per port and per
36  * QoS class for both ingress and egress.
37  */
38 
39 /*  Amount of packet buffer
40  *  |  per QoS class
41  *  |  |  reserved
42  *  |  |  |   per egress port
43  *  |  |  |   |
44  *  V  V  v   v
45  * BUF_Q_RSRV_E
46  */
47 #define BUF_Q_RSRV_E(port, prio) \
48 	(BUF_xxxx_E + xxx_Q_RSRV_x + OCELOT_NUM_TC * (port) + (prio))
49 
50 /*  Amount of packet buffer
51  *  |  for all port's traffic classes
52  *  |  |  reserved
53  *  |  |  |   per egress port
54  *  |  |  |   |
55  *  V  V  v   v
56  * BUF_P_RSRV_E
57  */
58 #define BUF_P_RSRV_E(port) \
59 	(BUF_xxxx_E + xxx_P_RSRV_x + (port))
60 
61 /*  Amount of packet buffer
62  *  |  per QoS class
63  *  |  |  reserved
64  *  |  |  |   per ingress port
65  *  |  |  |   |
66  *  V  V  v   v
67  * BUF_Q_RSRV_I
68  */
69 #define BUF_Q_RSRV_I(port, prio) \
70 	(BUF_xxxx_I + xxx_Q_RSRV_x + OCELOT_NUM_TC * (port) + (prio))
71 
72 /*  Amount of packet buffer
73  *  |  for all port's traffic classes
74  *  |  |  reserved
75  *  |  |  |   per ingress port
76  *  |  |  |   |
77  *  V  V  v   v
78  * BUF_P_RSRV_I
79  */
80 #define BUF_P_RSRV_I(port) \
81 	(BUF_xxxx_I + xxx_P_RSRV_x + (port))
82 
83 /*  Amount of frame references
84  *  |  per QoS class
85  *  |  |  reserved
86  *  |  |  |   per egress port
87  *  |  |  |   |
88  *  V  V  v   v
89  * REF_Q_RSRV_E
90  */
91 #define REF_Q_RSRV_E(port, prio) \
92 	(REF_xxxx_E + xxx_Q_RSRV_x + OCELOT_NUM_TC * (port) + (prio))
93 
94 /*  Amount of frame references
95  *  |  for all port's traffic classes
96  *  |  |  reserved
97  *  |  |  |   per egress port
98  *  |  |  |   |
99  *  V  V  v   v
100  * REF_P_RSRV_E
101  */
102 #define REF_P_RSRV_E(port) \
103 	(REF_xxxx_E + xxx_P_RSRV_x + (port))
104 
105 /*  Amount of frame references
106  *  |  per QoS class
107  *  |  |  reserved
108  *  |  |  |   per ingress port
109  *  |  |  |   |
110  *  V  V  v   v
111  * REF_Q_RSRV_I
112  */
113 #define REF_Q_RSRV_I(port, prio) \
114 	(REF_xxxx_I + xxx_Q_RSRV_x + OCELOT_NUM_TC * (port) + (prio))
115 
116 /*  Amount of frame references
117  *  |  for all port's traffic classes
118  *  |  |  reserved
119  *  |  |  |   per ingress port
120  *  |  |  |   |
121  *  V  V  v   v
122  * REF_P_RSRV_I
123  */
124 #define REF_P_RSRV_I(port) \
125 	(REF_xxxx_I + xxx_P_RSRV_x + (port))
126 
127 /* Sharing Watermarks
128  * ------------------
129  *
130  * The shared memory area is shared between all ports.
131  */
132 
133 /* Amount of buffer
134  *  |   per QoS class
135  *  |   |    from the shared memory area
136  *  |   |    |  for egress traffic
137  *  |   |    |  |
138  *  V   V    v  v
139  * BUF_PRIO_SHR_E
140  */
141 #define BUF_PRIO_SHR_E(prio) \
142 	(BUF_xxxx_E + xxx_PRIO_SHR_x + (prio))
143 
144 /* Amount of buffer
145  *  |   per color (drop precedence level)
146  *  |   |   from the shared memory area
147  *  |   |   |  for egress traffic
148  *  |   |   |  |
149  *  V   V   v  v
150  * BUF_COL_SHR_E
151  */
152 #define BUF_COL_SHR_E(dp) \
153 	(BUF_xxxx_E + xxx_COL_SHR_x + (1 - (dp)))
154 
155 /* Amount of buffer
156  *  |   per QoS class
157  *  |   |    from the shared memory area
158  *  |   |    |  for ingress traffic
159  *  |   |    |  |
160  *  V   V    v  v
161  * BUF_PRIO_SHR_I
162  */
163 #define BUF_PRIO_SHR_I(prio) \
164 	(BUF_xxxx_I + xxx_PRIO_SHR_x + (prio))
165 
166 /* Amount of buffer
167  *  |   per color (drop precedence level)
168  *  |   |   from the shared memory area
169  *  |   |   |  for ingress traffic
170  *  |   |   |  |
171  *  V   V   v  v
172  * BUF_COL_SHR_I
173  */
174 #define BUF_COL_SHR_I(dp) \
175 	(BUF_xxxx_I + xxx_COL_SHR_x + (1 - (dp)))
176 
177 /* Amount of frame references
178  *  |   per QoS class
179  *  |   |    from the shared area
180  *  |   |    |  for egress traffic
181  *  |   |    |  |
182  *  V   V    v  v
183  * REF_PRIO_SHR_E
184  */
185 #define REF_PRIO_SHR_E(prio) \
186 	(REF_xxxx_E + xxx_PRIO_SHR_x + (prio))
187 
188 /* Amount of frame references
189  *  |   per color (drop precedence level)
190  *  |   |   from the shared area
191  *  |   |   |  for egress traffic
192  *  |   |   |  |
193  *  V   V   v  v
194  * REF_COL_SHR_E
195  */
196 #define REF_COL_SHR_E(dp) \
197 	(REF_xxxx_E + xxx_COL_SHR_x + (1 - (dp)))
198 
199 /* Amount of frame references
200  *  |   per QoS class
201  *  |   |    from the shared area
202  *  |   |    |  for ingress traffic
203  *  |   |    |  |
204  *  V   V    v  v
205  * REF_PRIO_SHR_I
206  */
207 #define REF_PRIO_SHR_I(prio) \
208 	(REF_xxxx_I + xxx_PRIO_SHR_x + (prio))
209 
210 /* Amount of frame references
211  *  |   per color (drop precedence level)
212  *  |   |   from the shared area
213  *  |   |   |  for ingress traffic
214  *  |   |   |  |
215  *  V   V   v  v
216  * REF_COL_SHR_I
217  */
218 #define REF_COL_SHR_I(dp) \
219 	(REF_xxxx_I + xxx_COL_SHR_x + (1 - (dp)))
220 
ocelot_wm_read(struct ocelot * ocelot,int index)221 static u32 ocelot_wm_read(struct ocelot *ocelot, int index)
222 {
223 	int wm = ocelot_read_gix(ocelot, QSYS_RES_CFG, index);
224 
225 	return ocelot->ops->wm_dec(wm);
226 }
227 
ocelot_wm_write(struct ocelot * ocelot,int index,u32 val)228 static void ocelot_wm_write(struct ocelot *ocelot, int index, u32 val)
229 {
230 	u32 wm = ocelot->ops->wm_enc(val);
231 
232 	ocelot_write_gix(ocelot, wm, QSYS_RES_CFG, index);
233 }
234 
ocelot_wm_status(struct ocelot * ocelot,int index,u32 * inuse,u32 * maxuse)235 static void ocelot_wm_status(struct ocelot *ocelot, int index, u32 *inuse,
236 			     u32 *maxuse)
237 {
238 	int res_stat = ocelot_read_gix(ocelot, QSYS_RES_STAT, index);
239 
240 	return ocelot->ops->wm_stat(res_stat, inuse, maxuse);
241 }
242 
243 /* The hardware comes out of reset with strange defaults: the sum of all
244  * reservations for frame memory is larger than the total buffer size.
245  * One has to wonder how can the reservation watermarks still guarantee
246  * anything under congestion.
247  * Bring some sense into the hardware by changing the defaults to disable all
248  * reservations and rely only on the sharing watermark for frames with drop
249  * precedence 0. The user can still explicitly request reservations per port
250  * and per port-tc through devlink-sb.
251  */
ocelot_disable_reservation_watermarks(struct ocelot * ocelot,int port)252 static void ocelot_disable_reservation_watermarks(struct ocelot *ocelot,
253 						  int port)
254 {
255 	int prio;
256 
257 	for (prio = 0; prio < OCELOT_NUM_TC; prio++) {
258 		ocelot_wm_write(ocelot, BUF_Q_RSRV_I(port, prio), 0);
259 		ocelot_wm_write(ocelot, BUF_Q_RSRV_E(port, prio), 0);
260 		ocelot_wm_write(ocelot, REF_Q_RSRV_I(port, prio), 0);
261 		ocelot_wm_write(ocelot, REF_Q_RSRV_E(port, prio), 0);
262 	}
263 
264 	ocelot_wm_write(ocelot, BUF_P_RSRV_I(port), 0);
265 	ocelot_wm_write(ocelot, BUF_P_RSRV_E(port), 0);
266 	ocelot_wm_write(ocelot, REF_P_RSRV_I(port), 0);
267 	ocelot_wm_write(ocelot, REF_P_RSRV_E(port), 0);
268 }
269 
270 /* We want the sharing watermarks to consume all nonreserved resources, for
271  * efficient resource utilization (a single traffic flow should be able to use
272  * up the entire buffer space and frame resources as long as there's no
273  * interference).
274  * The switch has 10 sharing watermarks per lookup: 8 per traffic class and 2
275  * per color (drop precedence).
276  * The trouble with configuring these sharing watermarks is that:
277  * (1) There's a risk that we overcommit the resources if we configure
278  *     (a) all 8 per-TC sharing watermarks to the max
279  *     (b) all 2 per-color sharing watermarks to the max
280  * (2) There's a risk that we undercommit the resources if we configure
281  *     (a) all 8 per-TC sharing watermarks to "max / 8"
282  *     (b) all 2 per-color sharing watermarks to "max / 2"
283  * So for Linux, let's just disable the sharing watermarks per traffic class
284  * (setting them to 0 will make them always exceeded), and rely only on the
285  * sharing watermark for drop priority 0. So frames with drop priority set to 1
286  * by QoS classification or policing will still be allowed, but only as long as
287  * the port and port-TC reservations are not exceeded.
288  */
ocelot_disable_tc_sharing_watermarks(struct ocelot * ocelot)289 static void ocelot_disable_tc_sharing_watermarks(struct ocelot *ocelot)
290 {
291 	int prio;
292 
293 	for (prio = 0; prio < OCELOT_NUM_TC; prio++) {
294 		ocelot_wm_write(ocelot, BUF_PRIO_SHR_I(prio), 0);
295 		ocelot_wm_write(ocelot, BUF_PRIO_SHR_E(prio), 0);
296 		ocelot_wm_write(ocelot, REF_PRIO_SHR_I(prio), 0);
297 		ocelot_wm_write(ocelot, REF_PRIO_SHR_E(prio), 0);
298 	}
299 }
300 
ocelot_get_buf_rsrv(struct ocelot * ocelot,u32 * buf_rsrv_i,u32 * buf_rsrv_e)301 static void ocelot_get_buf_rsrv(struct ocelot *ocelot, u32 *buf_rsrv_i,
302 				u32 *buf_rsrv_e)
303 {
304 	int port, prio;
305 
306 	*buf_rsrv_i = 0;
307 	*buf_rsrv_e = 0;
308 
309 	for (port = 0; port <= ocelot->num_phys_ports; port++) {
310 		for (prio = 0; prio < OCELOT_NUM_TC; prio++) {
311 			*buf_rsrv_i += ocelot_wm_read(ocelot,
312 						      BUF_Q_RSRV_I(port, prio));
313 			*buf_rsrv_e += ocelot_wm_read(ocelot,
314 						      BUF_Q_RSRV_E(port, prio));
315 		}
316 
317 		*buf_rsrv_i += ocelot_wm_read(ocelot, BUF_P_RSRV_I(port));
318 		*buf_rsrv_e += ocelot_wm_read(ocelot, BUF_P_RSRV_E(port));
319 	}
320 
321 	*buf_rsrv_i *= OCELOT_BUFFER_CELL_SZ;
322 	*buf_rsrv_e *= OCELOT_BUFFER_CELL_SZ;
323 }
324 
ocelot_get_ref_rsrv(struct ocelot * ocelot,u32 * ref_rsrv_i,u32 * ref_rsrv_e)325 static void ocelot_get_ref_rsrv(struct ocelot *ocelot, u32 *ref_rsrv_i,
326 				u32 *ref_rsrv_e)
327 {
328 	int port, prio;
329 
330 	*ref_rsrv_i = 0;
331 	*ref_rsrv_e = 0;
332 
333 	for (port = 0; port <= ocelot->num_phys_ports; port++) {
334 		for (prio = 0; prio < OCELOT_NUM_TC; prio++) {
335 			*ref_rsrv_i += ocelot_wm_read(ocelot,
336 						      REF_Q_RSRV_I(port, prio));
337 			*ref_rsrv_e += ocelot_wm_read(ocelot,
338 						      REF_Q_RSRV_E(port, prio));
339 		}
340 
341 		*ref_rsrv_i += ocelot_wm_read(ocelot, REF_P_RSRV_I(port));
342 		*ref_rsrv_e += ocelot_wm_read(ocelot, REF_P_RSRV_E(port));
343 	}
344 }
345 
346 /* Calculate all reservations, then set up the sharing watermark for DP=0 to
347  * consume the remaining resources up to the pool's configured size.
348  */
ocelot_setup_sharing_watermarks(struct ocelot * ocelot)349 static void ocelot_setup_sharing_watermarks(struct ocelot *ocelot)
350 {
351 	u32 buf_rsrv_i, buf_rsrv_e;
352 	u32 ref_rsrv_i, ref_rsrv_e;
353 	u32 buf_shr_i, buf_shr_e;
354 	u32 ref_shr_i, ref_shr_e;
355 
356 	ocelot_get_buf_rsrv(ocelot, &buf_rsrv_i, &buf_rsrv_e);
357 	ocelot_get_ref_rsrv(ocelot, &ref_rsrv_i, &ref_rsrv_e);
358 
359 	buf_shr_i = ocelot->pool_size[OCELOT_SB_BUF][OCELOT_SB_POOL_ING] -
360 		    buf_rsrv_i;
361 	buf_shr_e = ocelot->pool_size[OCELOT_SB_BUF][OCELOT_SB_POOL_EGR] -
362 		    buf_rsrv_e;
363 	ref_shr_i = ocelot->pool_size[OCELOT_SB_REF][OCELOT_SB_POOL_ING] -
364 		    ref_rsrv_i;
365 	ref_shr_e = ocelot->pool_size[OCELOT_SB_REF][OCELOT_SB_POOL_EGR] -
366 		    ref_rsrv_e;
367 
368 	buf_shr_i /= OCELOT_BUFFER_CELL_SZ;
369 	buf_shr_e /= OCELOT_BUFFER_CELL_SZ;
370 
371 	ocelot_wm_write(ocelot, BUF_COL_SHR_I(0), buf_shr_i);
372 	ocelot_wm_write(ocelot, BUF_COL_SHR_E(0), buf_shr_e);
373 	ocelot_wm_write(ocelot, REF_COL_SHR_E(0), ref_shr_e);
374 	ocelot_wm_write(ocelot, REF_COL_SHR_I(0), ref_shr_i);
375 	ocelot_wm_write(ocelot, BUF_COL_SHR_I(1), 0);
376 	ocelot_wm_write(ocelot, BUF_COL_SHR_E(1), 0);
377 	ocelot_wm_write(ocelot, REF_COL_SHR_E(1), 0);
378 	ocelot_wm_write(ocelot, REF_COL_SHR_I(1), 0);
379 }
380 
381 /* Ensure that all reservations can be enforced */
ocelot_watermark_validate(struct ocelot * ocelot,struct netlink_ext_ack * extack)382 static int ocelot_watermark_validate(struct ocelot *ocelot,
383 				     struct netlink_ext_ack *extack)
384 {
385 	u32 buf_rsrv_i, buf_rsrv_e;
386 	u32 ref_rsrv_i, ref_rsrv_e;
387 
388 	ocelot_get_buf_rsrv(ocelot, &buf_rsrv_i, &buf_rsrv_e);
389 	ocelot_get_ref_rsrv(ocelot, &ref_rsrv_i, &ref_rsrv_e);
390 
391 	if (buf_rsrv_i > ocelot->pool_size[OCELOT_SB_BUF][OCELOT_SB_POOL_ING]) {
392 		NL_SET_ERR_MSG_MOD(extack,
393 				   "Ingress frame reservations exceed pool size");
394 		return -ERANGE;
395 	}
396 	if (buf_rsrv_e > ocelot->pool_size[OCELOT_SB_BUF][OCELOT_SB_POOL_EGR]) {
397 		NL_SET_ERR_MSG_MOD(extack,
398 				   "Egress frame reservations exceed pool size");
399 		return -ERANGE;
400 	}
401 	if (ref_rsrv_i > ocelot->pool_size[OCELOT_SB_REF][OCELOT_SB_POOL_ING]) {
402 		NL_SET_ERR_MSG_MOD(extack,
403 				   "Ingress reference reservations exceed pool size");
404 		return -ERANGE;
405 	}
406 	if (ref_rsrv_e > ocelot->pool_size[OCELOT_SB_REF][OCELOT_SB_POOL_EGR]) {
407 		NL_SET_ERR_MSG_MOD(extack,
408 				   "Egress reference reservations exceed pool size");
409 		return -ERANGE;
410 	}
411 
412 	return 0;
413 }
414 
415 /* The hardware works like this:
416  *
417  *                         Frame forwarding decision taken
418  *                                       |
419  *                                       v
420  *       +--------------------+--------------------+--------------------+
421  *       |                    |                    |                    |
422  *       v                    v                    v                    v
423  * Ingress memory       Egress memory        Ingress frame        Egress frame
424  *     check                check           reference check      reference check
425  *       |                    |                    |                    |
426  *       v                    v                    v                    v
427  *  BUF_Q_RSRV_I   ok    BUF_Q_RSRV_E   ok    REF_Q_RSRV_I   ok     REF_Q_RSRV_E   ok
428  *(src port, prio) -+  (dst port, prio) -+  (src port, prio) -+   (dst port, prio) -+
429  *       |          |         |          |         |          |         |           |
430  *       |exceeded  |         |exceeded  |         |exceeded  |         |exceeded   |
431  *       v          |         v          |         v          |         v           |
432  *  BUF_P_RSRV_I  ok|    BUF_P_RSRV_E  ok|    REF_P_RSRV_I  ok|    REF_P_RSRV_E   ok|
433  *   (src port) ----+     (dst port) ----+     (src port) ----+     (dst port) -----+
434  *       |          |         |          |         |          |         |           |
435  *       |exceeded  |         |exceeded  |         |exceeded  |         |exceeded   |
436  *       v          |         v          |         v          |         v           |
437  * BUF_PRIO_SHR_I ok|   BUF_PRIO_SHR_E ok|   REF_PRIO_SHR_I ok|   REF_PRIO_SHR_E  ok|
438  *     (prio) ------+       (prio) ------+       (prio) ------+       (prio) -------+
439  *       |          |         |          |         |          |         |           |
440  *       |exceeded  |         |exceeded  |         |exceeded  |         |exceeded   |
441  *       v          |         v          |         v          |         v           |
442  * BUF_COL_SHR_I  ok|   BUF_COL_SHR_E  ok|   REF_COL_SHR_I  ok|   REF_COL_SHR_E   ok|
443  *      (dp) -------+        (dp) -------+        (dp) -------+        (dp) --------+
444  *       |          |         |          |         |          |         |           |
445  *       |exceeded  |         |exceeded  |         |exceeded  |         |exceeded   |
446  *       v          v         v          v         v          v         v           v
447  *      fail     success     fail     success     fail     success     fail      success
448  *       |          |         |          |         |          |         |           |
449  *       v          v         v          v         v          v         v           v
450  *       +-----+----+         +-----+----+         +-----+----+         +-----+-----+
451  *             |                    |                    |                    |
452  *             +-------> OR <-------+                    +-------> OR <-------+
453  *                        |                                        |
454  *                        v                                        v
455  *                        +----------------> AND <-----------------+
456  *                                            |
457  *                                            v
458  *                                    FIFO drop / accept
459  *
460  * We are modeling each of the 4 parallel lookups as a devlink-sb pool.
461  * At least one (ingress or egress) memory pool and one (ingress or egress)
462  * frame reference pool need to have resources for frame acceptance to succeed.
463  *
464  * The following watermarks are controlled explicitly through devlink-sb:
465  * BUF_Q_RSRV_I, BUF_Q_RSRV_E, REF_Q_RSRV_I, REF_Q_RSRV_E
466  * BUF_P_RSRV_I, BUF_P_RSRV_E, REF_P_RSRV_I, REF_P_RSRV_E
467  * The following watermarks are controlled implicitly through devlink-sb:
468  * BUF_COL_SHR_I, BUF_COL_SHR_E, REF_COL_SHR_I, REF_COL_SHR_E
469  * The following watermarks are unused and disabled:
470  * BUF_PRIO_SHR_I, BUF_PRIO_SHR_E, REF_PRIO_SHR_I, REF_PRIO_SHR_E
471  *
472  * This function overrides the hardware defaults with more sane ones (no
473  * reservations by default, let sharing use all resources) and disables the
474  * unused watermarks.
475  */
ocelot_watermark_init(struct ocelot * ocelot)476 static void ocelot_watermark_init(struct ocelot *ocelot)
477 {
478 	int all_tcs = GENMASK(OCELOT_NUM_TC - 1, 0);
479 	int port;
480 
481 	ocelot_write(ocelot, all_tcs, QSYS_RES_QOS_MODE);
482 
483 	for (port = 0; port <= ocelot->num_phys_ports; port++)
484 		ocelot_disable_reservation_watermarks(ocelot, port);
485 
486 	ocelot_disable_tc_sharing_watermarks(ocelot);
487 	ocelot_setup_sharing_watermarks(ocelot);
488 }
489 
490 /* Pool size and type are fixed up at runtime. Keeping this structure to
491  * look up the cell size multipliers.
492  */
493 static const struct devlink_sb_pool_info ocelot_sb_pool[] = {
494 	[OCELOT_SB_BUF] = {
495 		.cell_size = OCELOT_BUFFER_CELL_SZ,
496 		.threshold_type = DEVLINK_SB_THRESHOLD_TYPE_STATIC,
497 	},
498 	[OCELOT_SB_REF] = {
499 		.cell_size = 1,
500 		.threshold_type = DEVLINK_SB_THRESHOLD_TYPE_STATIC,
501 	},
502 };
503 
504 /* Returns the pool size configured through ocelot_sb_pool_set */
ocelot_sb_pool_get(struct ocelot * ocelot,unsigned int sb_index,u16 pool_index,struct devlink_sb_pool_info * pool_info)505 int ocelot_sb_pool_get(struct ocelot *ocelot, unsigned int sb_index,
506 		       u16 pool_index,
507 		       struct devlink_sb_pool_info *pool_info)
508 {
509 	if (sb_index >= OCELOT_SB_NUM)
510 		return -ENODEV;
511 	if (pool_index >= OCELOT_SB_POOL_NUM)
512 		return -ENODEV;
513 
514 	*pool_info = ocelot_sb_pool[sb_index];
515 	pool_info->size = ocelot->pool_size[sb_index][pool_index];
516 	if (pool_index)
517 		pool_info->pool_type = DEVLINK_SB_POOL_TYPE_INGRESS;
518 	else
519 		pool_info->pool_type = DEVLINK_SB_POOL_TYPE_EGRESS;
520 
521 	return 0;
522 }
523 EXPORT_SYMBOL(ocelot_sb_pool_get);
524 
525 /* The pool size received here configures the total amount of resources used on
526  * ingress (or on egress, depending upon the pool index). The pool size, minus
527  * the values for the port and port-tc reservations, is written into the
528  * COL_SHR(dp=0) sharing watermark.
529  */
ocelot_sb_pool_set(struct ocelot * ocelot,unsigned int sb_index,u16 pool_index,u32 size,enum devlink_sb_threshold_type threshold_type,struct netlink_ext_ack * extack)530 int ocelot_sb_pool_set(struct ocelot *ocelot, unsigned int sb_index,
531 		       u16 pool_index, u32 size,
532 		       enum devlink_sb_threshold_type threshold_type,
533 		       struct netlink_ext_ack *extack)
534 {
535 	u32 old_pool_size;
536 	int err;
537 
538 	if (sb_index >= OCELOT_SB_NUM) {
539 		NL_SET_ERR_MSG_MOD(extack,
540 				   "Invalid sb, use 0 for buffers and 1 for frame references");
541 		return -ENODEV;
542 	}
543 	if (pool_index >= OCELOT_SB_POOL_NUM) {
544 		NL_SET_ERR_MSG_MOD(extack,
545 				   "Invalid pool, use 0 for ingress and 1 for egress");
546 		return -ENODEV;
547 	}
548 	if (threshold_type != DEVLINK_SB_THRESHOLD_TYPE_STATIC) {
549 		NL_SET_ERR_MSG_MOD(extack,
550 				   "Only static threshold supported");
551 		return -EOPNOTSUPP;
552 	}
553 
554 	old_pool_size = ocelot->pool_size[sb_index][pool_index];
555 	ocelot->pool_size[sb_index][pool_index] = size;
556 
557 	err = ocelot_watermark_validate(ocelot, extack);
558 	if (err) {
559 		ocelot->pool_size[sb_index][pool_index] = old_pool_size;
560 		return err;
561 	}
562 
563 	ocelot_setup_sharing_watermarks(ocelot);
564 
565 	return 0;
566 }
567 EXPORT_SYMBOL(ocelot_sb_pool_set);
568 
569 /* This retrieves the configuration made with ocelot_sb_port_pool_set */
ocelot_sb_port_pool_get(struct ocelot * ocelot,int port,unsigned int sb_index,u16 pool_index,u32 * p_threshold)570 int ocelot_sb_port_pool_get(struct ocelot *ocelot, int port,
571 			    unsigned int sb_index, u16 pool_index,
572 			    u32 *p_threshold)
573 {
574 	int wm_index;
575 
576 	switch (sb_index) {
577 	case OCELOT_SB_BUF:
578 		if (pool_index == OCELOT_SB_POOL_ING)
579 			wm_index = BUF_P_RSRV_I(port);
580 		else
581 			wm_index = BUF_P_RSRV_E(port);
582 		break;
583 	case OCELOT_SB_REF:
584 		if (pool_index == OCELOT_SB_POOL_ING)
585 			wm_index = REF_P_RSRV_I(port);
586 		else
587 			wm_index = REF_P_RSRV_E(port);
588 		break;
589 	default:
590 		return -ENODEV;
591 	}
592 
593 	*p_threshold = ocelot_wm_read(ocelot, wm_index);
594 	*p_threshold *= ocelot_sb_pool[sb_index].cell_size;
595 
596 	return 0;
597 }
598 EXPORT_SYMBOL(ocelot_sb_port_pool_get);
599 
600 /* This configures the P_RSRV per-port reserved resource watermark */
ocelot_sb_port_pool_set(struct ocelot * ocelot,int port,unsigned int sb_index,u16 pool_index,u32 threshold,struct netlink_ext_ack * extack)601 int ocelot_sb_port_pool_set(struct ocelot *ocelot, int port,
602 			    unsigned int sb_index, u16 pool_index,
603 			    u32 threshold, struct netlink_ext_ack *extack)
604 {
605 	int wm_index, err;
606 	u32 old_thr;
607 
608 	switch (sb_index) {
609 	case OCELOT_SB_BUF:
610 		if (pool_index == OCELOT_SB_POOL_ING)
611 			wm_index = BUF_P_RSRV_I(port);
612 		else
613 			wm_index = BUF_P_RSRV_E(port);
614 		break;
615 	case OCELOT_SB_REF:
616 		if (pool_index == OCELOT_SB_POOL_ING)
617 			wm_index = REF_P_RSRV_I(port);
618 		else
619 			wm_index = REF_P_RSRV_E(port);
620 		break;
621 	default:
622 		NL_SET_ERR_MSG_MOD(extack, "Invalid shared buffer");
623 		return -ENODEV;
624 	}
625 
626 	threshold /= ocelot_sb_pool[sb_index].cell_size;
627 
628 	old_thr = ocelot_wm_read(ocelot, wm_index);
629 	ocelot_wm_write(ocelot, wm_index, threshold);
630 
631 	err = ocelot_watermark_validate(ocelot, extack);
632 	if (err) {
633 		ocelot_wm_write(ocelot, wm_index, old_thr);
634 		return err;
635 	}
636 
637 	ocelot_setup_sharing_watermarks(ocelot);
638 
639 	return 0;
640 }
641 EXPORT_SYMBOL(ocelot_sb_port_pool_set);
642 
643 /* This retrieves the configuration done by ocelot_sb_tc_pool_bind_set */
ocelot_sb_tc_pool_bind_get(struct ocelot * ocelot,int port,unsigned int sb_index,u16 tc_index,enum devlink_sb_pool_type pool_type,u16 * p_pool_index,u32 * p_threshold)644 int ocelot_sb_tc_pool_bind_get(struct ocelot *ocelot, int port,
645 			       unsigned int sb_index, u16 tc_index,
646 			       enum devlink_sb_pool_type pool_type,
647 			       u16 *p_pool_index, u32 *p_threshold)
648 {
649 	int wm_index;
650 
651 	switch (sb_index) {
652 	case OCELOT_SB_BUF:
653 		if (pool_type == DEVLINK_SB_POOL_TYPE_INGRESS)
654 			wm_index = BUF_Q_RSRV_I(port, tc_index);
655 		else
656 			wm_index = BUF_Q_RSRV_E(port, tc_index);
657 		break;
658 	case OCELOT_SB_REF:
659 		if (pool_type == DEVLINK_SB_POOL_TYPE_INGRESS)
660 			wm_index = REF_Q_RSRV_I(port, tc_index);
661 		else
662 			wm_index = REF_Q_RSRV_E(port, tc_index);
663 		break;
664 	default:
665 		return -ENODEV;
666 	}
667 
668 	*p_threshold = ocelot_wm_read(ocelot, wm_index);
669 	*p_threshold *= ocelot_sb_pool[sb_index].cell_size;
670 
671 	if (pool_type == DEVLINK_SB_POOL_TYPE_INGRESS)
672 		*p_pool_index = 0;
673 	else
674 		*p_pool_index = 1;
675 
676 	return 0;
677 }
678 EXPORT_SYMBOL(ocelot_sb_tc_pool_bind_get);
679 
680 /* This configures the Q_RSRV per-port-tc reserved resource watermark */
ocelot_sb_tc_pool_bind_set(struct ocelot * ocelot,int port,unsigned int sb_index,u16 tc_index,enum devlink_sb_pool_type pool_type,u16 pool_index,u32 threshold,struct netlink_ext_ack * extack)681 int ocelot_sb_tc_pool_bind_set(struct ocelot *ocelot, int port,
682 			       unsigned int sb_index, u16 tc_index,
683 			       enum devlink_sb_pool_type pool_type,
684 			       u16 pool_index, u32 threshold,
685 			       struct netlink_ext_ack *extack)
686 {
687 	int wm_index, err;
688 	u32 old_thr;
689 
690 	/* Paranoid check? */
691 	if (pool_index == OCELOT_SB_POOL_ING &&
692 	    pool_type != DEVLINK_SB_POOL_TYPE_INGRESS)
693 		return -EINVAL;
694 	if (pool_index == OCELOT_SB_POOL_EGR &&
695 	    pool_type != DEVLINK_SB_POOL_TYPE_EGRESS)
696 		return -EINVAL;
697 
698 	switch (sb_index) {
699 	case OCELOT_SB_BUF:
700 		if (pool_type == DEVLINK_SB_POOL_TYPE_INGRESS)
701 			wm_index = BUF_Q_RSRV_I(port, tc_index);
702 		else
703 			wm_index = BUF_Q_RSRV_E(port, tc_index);
704 		break;
705 	case OCELOT_SB_REF:
706 		if (pool_type == DEVLINK_SB_POOL_TYPE_INGRESS)
707 			wm_index = REF_Q_RSRV_I(port, tc_index);
708 		else
709 			wm_index = REF_Q_RSRV_E(port, tc_index);
710 		break;
711 	default:
712 		NL_SET_ERR_MSG_MOD(extack, "Invalid shared buffer");
713 		return -ENODEV;
714 	}
715 
716 	threshold /= ocelot_sb_pool[sb_index].cell_size;
717 
718 	old_thr = ocelot_wm_read(ocelot, wm_index);
719 	ocelot_wm_write(ocelot, wm_index, threshold);
720 	err = ocelot_watermark_validate(ocelot, extack);
721 	if (err) {
722 		ocelot_wm_write(ocelot, wm_index, old_thr);
723 		return err;
724 	}
725 
726 	ocelot_setup_sharing_watermarks(ocelot);
727 
728 	return 0;
729 }
730 EXPORT_SYMBOL(ocelot_sb_tc_pool_bind_set);
731 
732 /* The hardware does not support atomic snapshots, we'll read out the
733  * occupancy registers individually and have this as just a stub.
734  */
ocelot_sb_occ_snapshot(struct ocelot * ocelot,unsigned int sb_index)735 int ocelot_sb_occ_snapshot(struct ocelot *ocelot, unsigned int sb_index)
736 {
737 	return 0;
738 }
739 EXPORT_SYMBOL(ocelot_sb_occ_snapshot);
740 
741 /* The watermark occupancy registers are cleared upon read,
742  * so let's read them.
743  */
ocelot_sb_occ_max_clear(struct ocelot * ocelot,unsigned int sb_index)744 int ocelot_sb_occ_max_clear(struct ocelot *ocelot, unsigned int sb_index)
745 {
746 	u32 inuse, maxuse;
747 	int port, prio;
748 
749 	switch (sb_index) {
750 	case OCELOT_SB_BUF:
751 		for (port = 0; port <= ocelot->num_phys_ports; port++) {
752 			for (prio = 0; prio < OCELOT_NUM_TC; prio++) {
753 				ocelot_wm_status(ocelot, BUF_Q_RSRV_I(port, prio),
754 						 &inuse, &maxuse);
755 				ocelot_wm_status(ocelot, BUF_Q_RSRV_E(port, prio),
756 						 &inuse, &maxuse);
757 			}
758 			ocelot_wm_status(ocelot, BUF_P_RSRV_I(port),
759 					 &inuse, &maxuse);
760 			ocelot_wm_status(ocelot, BUF_P_RSRV_E(port),
761 					 &inuse, &maxuse);
762 		}
763 		break;
764 	case OCELOT_SB_REF:
765 		for (port = 0; port <= ocelot->num_phys_ports; port++) {
766 			for (prio = 0; prio < OCELOT_NUM_TC; prio++) {
767 				ocelot_wm_status(ocelot, REF_Q_RSRV_I(port, prio),
768 						 &inuse, &maxuse);
769 				ocelot_wm_status(ocelot, REF_Q_RSRV_E(port, prio),
770 						 &inuse, &maxuse);
771 			}
772 			ocelot_wm_status(ocelot, REF_P_RSRV_I(port),
773 					 &inuse, &maxuse);
774 			ocelot_wm_status(ocelot, REF_P_RSRV_E(port),
775 					 &inuse, &maxuse);
776 		}
777 		break;
778 	default:
779 		return -ENODEV;
780 	}
781 
782 	return 0;
783 }
784 EXPORT_SYMBOL(ocelot_sb_occ_max_clear);
785 
786 /* This retrieves the watermark occupancy for per-port P_RSRV watermarks */
ocelot_sb_occ_port_pool_get(struct ocelot * ocelot,int port,unsigned int sb_index,u16 pool_index,u32 * p_cur,u32 * p_max)787 int ocelot_sb_occ_port_pool_get(struct ocelot *ocelot, int port,
788 				unsigned int sb_index, u16 pool_index,
789 				u32 *p_cur, u32 *p_max)
790 {
791 	int wm_index;
792 
793 	switch (sb_index) {
794 	case OCELOT_SB_BUF:
795 		if (pool_index == OCELOT_SB_POOL_ING)
796 			wm_index = BUF_P_RSRV_I(port);
797 		else
798 			wm_index = BUF_P_RSRV_E(port);
799 		break;
800 	case OCELOT_SB_REF:
801 		if (pool_index == OCELOT_SB_POOL_ING)
802 			wm_index = REF_P_RSRV_I(port);
803 		else
804 			wm_index = REF_P_RSRV_E(port);
805 		break;
806 	default:
807 		return -ENODEV;
808 	}
809 
810 	ocelot_wm_status(ocelot, wm_index, p_cur, p_max);
811 	*p_cur *= ocelot_sb_pool[sb_index].cell_size;
812 	*p_max *= ocelot_sb_pool[sb_index].cell_size;
813 
814 	return 0;
815 }
816 EXPORT_SYMBOL(ocelot_sb_occ_port_pool_get);
817 
818 /* This retrieves the watermark occupancy for per-port-tc Q_RSRV watermarks */
ocelot_sb_occ_tc_port_bind_get(struct ocelot * ocelot,int port,unsigned int sb_index,u16 tc_index,enum devlink_sb_pool_type pool_type,u32 * p_cur,u32 * p_max)819 int ocelot_sb_occ_tc_port_bind_get(struct ocelot *ocelot, int port,
820 				   unsigned int sb_index, u16 tc_index,
821 				   enum devlink_sb_pool_type pool_type,
822 				   u32 *p_cur, u32 *p_max)
823 {
824 	int wm_index;
825 
826 	switch (sb_index) {
827 	case OCELOT_SB_BUF:
828 		if (pool_type == DEVLINK_SB_POOL_TYPE_INGRESS)
829 			wm_index = BUF_Q_RSRV_I(port, tc_index);
830 		else
831 			wm_index = BUF_Q_RSRV_E(port, tc_index);
832 		break;
833 	case OCELOT_SB_REF:
834 		if (pool_type == DEVLINK_SB_POOL_TYPE_INGRESS)
835 			wm_index = REF_Q_RSRV_I(port, tc_index);
836 		else
837 			wm_index = REF_Q_RSRV_E(port, tc_index);
838 		break;
839 	default:
840 		return -ENODEV;
841 	}
842 
843 	ocelot_wm_status(ocelot, wm_index, p_cur, p_max);
844 	*p_cur *= ocelot_sb_pool[sb_index].cell_size;
845 	*p_max *= ocelot_sb_pool[sb_index].cell_size;
846 
847 	return 0;
848 }
849 EXPORT_SYMBOL(ocelot_sb_occ_tc_port_bind_get);
850 
ocelot_devlink_sb_register(struct ocelot * ocelot)851 int ocelot_devlink_sb_register(struct ocelot *ocelot)
852 {
853 	int err;
854 
855 	err = devlink_sb_register(ocelot->devlink, OCELOT_SB_BUF,
856 				  ocelot->packet_buffer_size, 1, 1,
857 				  OCELOT_NUM_TC, OCELOT_NUM_TC);
858 	if (err)
859 		return err;
860 
861 	err = devlink_sb_register(ocelot->devlink, OCELOT_SB_REF,
862 				  ocelot->num_frame_refs, 1, 1,
863 				  OCELOT_NUM_TC, OCELOT_NUM_TC);
864 	if (err) {
865 		devlink_sb_unregister(ocelot->devlink, OCELOT_SB_BUF);
866 		return err;
867 	}
868 
869 	ocelot->pool_size[OCELOT_SB_BUF][OCELOT_SB_POOL_ING] = ocelot->packet_buffer_size;
870 	ocelot->pool_size[OCELOT_SB_BUF][OCELOT_SB_POOL_EGR] = ocelot->packet_buffer_size;
871 	ocelot->pool_size[OCELOT_SB_REF][OCELOT_SB_POOL_ING] = ocelot->num_frame_refs;
872 	ocelot->pool_size[OCELOT_SB_REF][OCELOT_SB_POOL_EGR] = ocelot->num_frame_refs;
873 
874 	ocelot_watermark_init(ocelot);
875 
876 	return 0;
877 }
878 EXPORT_SYMBOL(ocelot_devlink_sb_register);
879 
ocelot_devlink_sb_unregister(struct ocelot * ocelot)880 void ocelot_devlink_sb_unregister(struct ocelot *ocelot)
881 {
882 	devlink_sb_unregister(ocelot->devlink, OCELOT_SB_BUF);
883 	devlink_sb_unregister(ocelot->devlink, OCELOT_SB_REF);
884 }
885 EXPORT_SYMBOL(ocelot_devlink_sb_unregister);
886