1 // SPDX-License-Identifier: (GPL-2.0 OR MIT)
2 /* Copyright 2020-2021 NXP
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
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
33  * ----------------------
35  * For setting up the reserved areas, egress watermarks exist per port and per
40  *  |  per QoS class
42  *  |  |  |   per egress port
47 #define BUF_Q_RSRV_E(port, prio) \  argument
48 	(BUF_xxxx_E + xxx_Q_RSRV_x + OCELOT_NUM_TC * (port) + (prio))
51  *  |  for all port's traffic classes
53  *  |  |  |   per egress port
58 #define BUF_P_RSRV_E(port) \  argument
59 	(BUF_xxxx_E + xxx_P_RSRV_x + (port))
62  *  |  per QoS class
64  *  |  |  |   per ingress port
69 #define BUF_Q_RSRV_I(port, prio) \  argument
70 	(BUF_xxxx_I + xxx_Q_RSRV_x + OCELOT_NUM_TC * (port) + (prio))
73  *  |  for all port's traffic classes
75  *  |  |  |   per ingress port
80 #define BUF_P_RSRV_I(port) \  argument
81 	(BUF_xxxx_I + xxx_P_RSRV_x + (port))
84  *  |  per QoS class
86  *  |  |  |   per egress port
91 #define REF_Q_RSRV_E(port, prio) \  argument
92 	(REF_xxxx_E + xxx_Q_RSRV_x + OCELOT_NUM_TC * (port) + (prio))
95  *  |  for all port's traffic classes
97  *  |  |  |   per egress port
102 #define REF_P_RSRV_E(port) \  argument
103 	(REF_xxxx_E + xxx_P_RSRV_x + (port))
106  *  |  per QoS class
108  *  |  |  |   per ingress port
113 #define REF_Q_RSRV_I(port, prio) \  argument
114 	(REF_xxxx_I + xxx_Q_RSRV_x + OCELOT_NUM_TC * (port) + (prio))
117  *  |  for all port's traffic classes
119  *  |  |  |   per ingress port
124 #define REF_P_RSRV_I(port) \  argument
125 	(REF_xxxx_I + xxx_P_RSRV_x + (port))
128  * ------------------
134  *  |   per QoS class
145  *  |   per color (drop precedence level)
153 	(BUF_xxxx_E + xxx_COL_SHR_x + (1 - (dp)))
156  *  |   per QoS class
167  *  |   per color (drop precedence level)
175 	(BUF_xxxx_I + xxx_COL_SHR_x + (1 - (dp)))
178  *  |   per QoS class
189  *  |   per color (drop precedence level)
197 	(REF_xxxx_E + xxx_COL_SHR_x + (1 - (dp)))
200  *  |   per QoS class
211  *  |   per color (drop precedence level)
219 	(REF_xxxx_I + xxx_COL_SHR_x + (1 - (dp)))
225 	return ocelot->ops->wm_dec(wm);  in ocelot_wm_read()
230 	u32 wm = ocelot->ops->wm_enc(val);  in ocelot_wm_write()
240 	return ocelot->ops->wm_stat(res_stat, inuse, maxuse);  in ocelot_wm_status()
249  * precedence 0. The user can still explicitly request reservations per port
250  * and per port-tc through devlink-sb.
253 						  int port)  in ocelot_disable_reservation_watermarks()  argument
258 		ocelot_wm_write(ocelot, BUF_Q_RSRV_I(port, prio), 0);  in ocelot_disable_reservation_watermarks()
259 		ocelot_wm_write(ocelot, BUF_Q_RSRV_E(port, prio), 0);  in ocelot_disable_reservation_watermarks()
260 		ocelot_wm_write(ocelot, REF_Q_RSRV_I(port, prio), 0);  in ocelot_disable_reservation_watermarks()
261 		ocelot_wm_write(ocelot, REF_Q_RSRV_E(port, prio), 0);  in ocelot_disable_reservation_watermarks()
264 	ocelot_wm_write(ocelot, BUF_P_RSRV_I(port), 0);  in ocelot_disable_reservation_watermarks()
265 	ocelot_wm_write(ocelot, BUF_P_RSRV_E(port), 0);  in ocelot_disable_reservation_watermarks()
266 	ocelot_wm_write(ocelot, REF_P_RSRV_I(port), 0);  in ocelot_disable_reservation_watermarks()
267 	ocelot_wm_write(ocelot, REF_P_RSRV_E(port), 0);  in ocelot_disable_reservation_watermarks()
274  * The switch has 10 sharing watermarks per lookup: 8 per traffic class and 2
275  * per color (drop precedence).
278  *     (a) all 8 per-TC sharing watermarks to the max
279  *     (b) all 2 per-color sharing watermarks to the max
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
287  * the port and port-TC reservations are not exceeded.
304 	int port, prio;  in ocelot_get_buf_rsrv()  local
309 	for (port = 0; port <= ocelot->num_phys_ports; port++) {  in ocelot_get_buf_rsrv()
312 						      BUF_Q_RSRV_I(port, prio));  in ocelot_get_buf_rsrv()
314 						      BUF_Q_RSRV_E(port, prio));  in ocelot_get_buf_rsrv()
317 		*buf_rsrv_i += ocelot_wm_read(ocelot, BUF_P_RSRV_I(port));  in ocelot_get_buf_rsrv()
318 		*buf_rsrv_e += ocelot_wm_read(ocelot, BUF_P_RSRV_E(port));  in ocelot_get_buf_rsrv()
328 	int port, prio;  in ocelot_get_ref_rsrv()  local
333 	for (port = 0; port <= ocelot->num_phys_ports; port++) {  in ocelot_get_ref_rsrv()
336 						      REF_Q_RSRV_I(port, prio));  in ocelot_get_ref_rsrv()
338 						      REF_Q_RSRV_E(port, prio));  in ocelot_get_ref_rsrv()
341 		*ref_rsrv_i += ocelot_wm_read(ocelot, REF_P_RSRV_I(port));  in ocelot_get_ref_rsrv()
342 		*ref_rsrv_e += ocelot_wm_read(ocelot, REF_P_RSRV_E(port));  in ocelot_get_ref_rsrv()
359 	buf_shr_i = ocelot->pool_size[OCELOT_SB_BUF][OCELOT_SB_POOL_ING] -  in ocelot_setup_sharing_watermarks()
361 	buf_shr_e = ocelot->pool_size[OCELOT_SB_BUF][OCELOT_SB_POOL_EGR] -  in ocelot_setup_sharing_watermarks()
363 	ref_shr_i = ocelot->pool_size[OCELOT_SB_REF][OCELOT_SB_POOL_ING] -  in ocelot_setup_sharing_watermarks()
365 	ref_shr_e = ocelot->pool_size[OCELOT_SB_REF][OCELOT_SB_POOL_EGR] -  in ocelot_setup_sharing_watermarks()
391 	if (buf_rsrv_i > ocelot->pool_size[OCELOT_SB_BUF][OCELOT_SB_POOL_ING]) {  in ocelot_watermark_validate()
394 		return -ERANGE;  in ocelot_watermark_validate()
396 	if (buf_rsrv_e > ocelot->pool_size[OCELOT_SB_BUF][OCELOT_SB_POOL_EGR]) {  in ocelot_watermark_validate()
399 		return -ERANGE;  in ocelot_watermark_validate()
401 	if (ref_rsrv_i > ocelot->pool_size[OCELOT_SB_REF][OCELOT_SB_POOL_ING]) {  in ocelot_watermark_validate()
404 		return -ERANGE;  in ocelot_watermark_validate()
406 	if (ref_rsrv_e > ocelot->pool_size[OCELOT_SB_REF][OCELOT_SB_POOL_EGR]) {  in ocelot_watermark_validate()
409 		return -ERANGE;  in ocelot_watermark_validate()
420  *       +--------------------+--------------------+--------------------+
428  *(src port, prio) -+  (dst port, prio) -+  (src port, prio) -+   (dst port, prio) -+
433  *   (src port) ----+     (dst port) ----+     (src port) ----+     (dst port) -----+
438  *     (prio) ------+       (prio) ------+       (prio) ------+       (prio) -------+
443  *      (dp) -------+        (dp) -------+        (dp) -------+        (dp) --------+
450  *       +-----+----+         +-----+----+         +-----+----+         +-----+-----+
452  *             +-------> OR <-------+                    +-------> OR <-------+
455  *                        +----------------> AND <-----------------+
460  * We are modeling each of the 4 parallel lookups as a devlink-sb pool.
464  * The following watermarks are controlled explicitly through devlink-sb:
467  * The following watermarks are controlled implicitly through devlink-sb:
478 	int all_tcs = GENMASK(OCELOT_NUM_TC - 1, 0);  in ocelot_watermark_init()
479 	int port;  in ocelot_watermark_init()  local
483 	for (port = 0; port <= ocelot->num_phys_ports; port++)  in ocelot_watermark_init()
484 		ocelot_disable_reservation_watermarks(ocelot, port);  in ocelot_watermark_init()
492  * Bit 7-0: Value to be multiplied with unit
541 		return -ENODEV;  in ocelot_sb_pool_get()
543 		return -ENODEV;  in ocelot_sb_pool_get()
546 	pool_info->size = ocelot->pool_size[sb_index][pool_index];  in ocelot_sb_pool_get()
548 		pool_info->pool_type = DEVLINK_SB_POOL_TYPE_INGRESS;  in ocelot_sb_pool_get()
550 		pool_info->pool_type = DEVLINK_SB_POOL_TYPE_EGRESS;  in ocelot_sb_pool_get()
558  * the values for the port and port-tc reservations, is written into the
572 		return -ENODEV;  in ocelot_sb_pool_set()
577 		return -ENODEV;  in ocelot_sb_pool_set()
582 		return -EOPNOTSUPP;  in ocelot_sb_pool_set()
585 	old_pool_size = ocelot->pool_size[sb_index][pool_index];  in ocelot_sb_pool_set()
586 	ocelot->pool_size[sb_index][pool_index] = size;  in ocelot_sb_pool_set()
590 		ocelot->pool_size[sb_index][pool_index] = old_pool_size;  in ocelot_sb_pool_set()
601 int ocelot_sb_port_pool_get(struct ocelot *ocelot, int port,  in ocelot_sb_port_pool_get()  argument
610 			wm_index = BUF_P_RSRV_I(port);  in ocelot_sb_port_pool_get()
612 			wm_index = BUF_P_RSRV_E(port);  in ocelot_sb_port_pool_get()
616 			wm_index = REF_P_RSRV_I(port);  in ocelot_sb_port_pool_get()
618 			wm_index = REF_P_RSRV_E(port);  in ocelot_sb_port_pool_get()
621 		return -ENODEV;  in ocelot_sb_port_pool_get()
631 /* This configures the P_RSRV per-port reserved resource watermark */
632 int ocelot_sb_port_pool_set(struct ocelot *ocelot, int port,  in ocelot_sb_port_pool_set()  argument
642 			wm_index = BUF_P_RSRV_I(port);  in ocelot_sb_port_pool_set()
644 			wm_index = BUF_P_RSRV_E(port);  in ocelot_sb_port_pool_set()
648 			wm_index = REF_P_RSRV_I(port);  in ocelot_sb_port_pool_set()
650 			wm_index = REF_P_RSRV_E(port);  in ocelot_sb_port_pool_set()
654 		return -ENODEV;  in ocelot_sb_port_pool_set()
675 int ocelot_sb_tc_pool_bind_get(struct ocelot *ocelot, int port,  in ocelot_sb_tc_pool_bind_get()  argument
685 			wm_index = BUF_Q_RSRV_I(port, tc_index);  in ocelot_sb_tc_pool_bind_get()
687 			wm_index = BUF_Q_RSRV_E(port, tc_index);  in ocelot_sb_tc_pool_bind_get()
691 			wm_index = REF_Q_RSRV_I(port, tc_index);  in ocelot_sb_tc_pool_bind_get()
693 			wm_index = REF_Q_RSRV_E(port, tc_index);  in ocelot_sb_tc_pool_bind_get()
696 		return -ENODEV;  in ocelot_sb_tc_pool_bind_get()
711 /* This configures the Q_RSRV per-port-tc reserved resource watermark */
712 int ocelot_sb_tc_pool_bind_set(struct ocelot *ocelot, int port,  in ocelot_sb_tc_pool_bind_set()  argument
724 		return -EINVAL;  in ocelot_sb_tc_pool_bind_set()
727 		return -EINVAL;  in ocelot_sb_tc_pool_bind_set()
732 			wm_index = BUF_Q_RSRV_I(port, tc_index);  in ocelot_sb_tc_pool_bind_set()
734 			wm_index = BUF_Q_RSRV_E(port, tc_index);  in ocelot_sb_tc_pool_bind_set()
738 			wm_index = REF_Q_RSRV_I(port, tc_index);  in ocelot_sb_tc_pool_bind_set()
740 			wm_index = REF_Q_RSRV_E(port, tc_index);  in ocelot_sb_tc_pool_bind_set()
744 		return -ENODEV;  in ocelot_sb_tc_pool_bind_set()
778 	int port, prio;  in ocelot_sb_occ_max_clear()  local
782 		for (port = 0; port <= ocelot->num_phys_ports; port++) {  in ocelot_sb_occ_max_clear()
784 				ocelot_wm_status(ocelot, BUF_Q_RSRV_I(port, prio),  in ocelot_sb_occ_max_clear()
786 				ocelot_wm_status(ocelot, BUF_Q_RSRV_E(port, prio),  in ocelot_sb_occ_max_clear()
789 			ocelot_wm_status(ocelot, BUF_P_RSRV_I(port),  in ocelot_sb_occ_max_clear()
791 			ocelot_wm_status(ocelot, BUF_P_RSRV_E(port),  in ocelot_sb_occ_max_clear()
796 		for (port = 0; port <= ocelot->num_phys_ports; port++) {  in ocelot_sb_occ_max_clear()
798 				ocelot_wm_status(ocelot, REF_Q_RSRV_I(port, prio),  in ocelot_sb_occ_max_clear()
800 				ocelot_wm_status(ocelot, REF_Q_RSRV_E(port, prio),  in ocelot_sb_occ_max_clear()
803 			ocelot_wm_status(ocelot, REF_P_RSRV_I(port),  in ocelot_sb_occ_max_clear()
805 			ocelot_wm_status(ocelot, REF_P_RSRV_E(port),  in ocelot_sb_occ_max_clear()
810 		return -ENODEV;  in ocelot_sb_occ_max_clear()
817 /* This retrieves the watermark occupancy for per-port P_RSRV watermarks */
818 int ocelot_sb_occ_port_pool_get(struct ocelot *ocelot, int port,  in ocelot_sb_occ_port_pool_get()  argument
827 			wm_index = BUF_P_RSRV_I(port);  in ocelot_sb_occ_port_pool_get()
829 			wm_index = BUF_P_RSRV_E(port);  in ocelot_sb_occ_port_pool_get()
833 			wm_index = REF_P_RSRV_I(port);  in ocelot_sb_occ_port_pool_get()
835 			wm_index = REF_P_RSRV_E(port);  in ocelot_sb_occ_port_pool_get()
838 		return -ENODEV;  in ocelot_sb_occ_port_pool_get()
849 /* This retrieves the watermark occupancy for per-port-tc Q_RSRV watermarks */
850 int ocelot_sb_occ_tc_port_bind_get(struct ocelot *ocelot, int port,  in ocelot_sb_occ_tc_port_bind_get()  argument
860 			wm_index = BUF_Q_RSRV_I(port, tc_index);  in ocelot_sb_occ_tc_port_bind_get()
862 			wm_index = BUF_Q_RSRV_E(port, tc_index);  in ocelot_sb_occ_tc_port_bind_get()
866 			wm_index = REF_Q_RSRV_I(port, tc_index);  in ocelot_sb_occ_tc_port_bind_get()
868 			wm_index = REF_Q_RSRV_E(port, tc_index);  in ocelot_sb_occ_tc_port_bind_get()
871 		return -ENODEV;  in ocelot_sb_occ_tc_port_bind_get()
886 	err = devlink_sb_register(ocelot->devlink, OCELOT_SB_BUF,  in ocelot_devlink_sb_register()
887 				  ocelot->packet_buffer_size, 1, 1,  in ocelot_devlink_sb_register()
892 	err = devlink_sb_register(ocelot->devlink, OCELOT_SB_REF,  in ocelot_devlink_sb_register()
893 				  ocelot->num_frame_refs, 1, 1,  in ocelot_devlink_sb_register()
896 		devlink_sb_unregister(ocelot->devlink, OCELOT_SB_BUF);  in ocelot_devlink_sb_register()
900 	ocelot->pool_size[OCELOT_SB_BUF][OCELOT_SB_POOL_ING] = ocelot->packet_buffer_size;  in ocelot_devlink_sb_register()
901 	ocelot->pool_size[OCELOT_SB_BUF][OCELOT_SB_POOL_EGR] = ocelot->packet_buffer_size;  in ocelot_devlink_sb_register()
902 	ocelot->pool_size[OCELOT_SB_REF][OCELOT_SB_POOL_ING] = ocelot->num_frame_refs;  in ocelot_devlink_sb_register()
903 	ocelot->pool_size[OCELOT_SB_REF][OCELOT_SB_POOL_EGR] = ocelot->num_frame_refs;  in ocelot_devlink_sb_register()
913 	devlink_sb_unregister(ocelot->devlink, OCELOT_SB_BUF);  in ocelot_devlink_sb_unregister()
914 	devlink_sb_unregister(ocelot->devlink, OCELOT_SB_REF);  in ocelot_devlink_sb_unregister()