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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 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528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 | // SPDX-License-Identifier: (GPL-2.0 OR MIT) /* Copyright 2020-2021 NXP */ #include <net/devlink.h> #include "ocelot.h" /* The queue system tracks four resource consumptions: * Resource 0: Memory tracked per source port * Resource 1: Frame references tracked per source port * Resource 2: Memory tracked per destination port * Resource 3: Frame references tracked per destination port */ #define OCELOT_RESOURCE_SZ 256 #define OCELOT_NUM_RESOURCES 4 #define BUF_xxxx_I (0 * OCELOT_RESOURCE_SZ) #define REF_xxxx_I (1 * OCELOT_RESOURCE_SZ) #define BUF_xxxx_E (2 * OCELOT_RESOURCE_SZ) #define REF_xxxx_E (3 * OCELOT_RESOURCE_SZ) /* For each resource type there are 4 types of watermarks: * Q_RSRV: reservation per QoS class per port * PRIO_SHR: sharing watermark per QoS class across all ports * P_RSRV: reservation per port * COL_SHR: sharing watermark per color (drop precedence) across all ports */ #define xxx_Q_RSRV_x 0 #define xxx_PRIO_SHR_x 216 #define xxx_P_RSRV_x 224 #define xxx_COL_SHR_x 254 /* Reservation Watermarks * ---------------------- * * For setting up the reserved areas, egress watermarks exist per port and per * QoS class for both ingress and egress. */ /* Amount of packet buffer * | per QoS class * | | reserved * | | | per egress port * | | | | * V V v v * BUF_Q_RSRV_E */ #define BUF_Q_RSRV_E(port, prio) \ (BUF_xxxx_E + xxx_Q_RSRV_x + OCELOT_NUM_TC * (port) + (prio)) /* Amount of packet buffer * | for all port's traffic classes * | | reserved * | | | per egress port * | | | | * V V v v * BUF_P_RSRV_E */ #define BUF_P_RSRV_E(port) \ (BUF_xxxx_E + xxx_P_RSRV_x + (port)) /* Amount of packet buffer * | per QoS class * | | reserved * | | | per ingress port * | | | | * V V v v * BUF_Q_RSRV_I */ #define BUF_Q_RSRV_I(port, prio) \ (BUF_xxxx_I + xxx_Q_RSRV_x + OCELOT_NUM_TC * (port) + (prio)) /* Amount of packet buffer * | for all port's traffic classes * | | reserved * | | | per ingress port * | | | | * V V v v * BUF_P_RSRV_I */ #define BUF_P_RSRV_I(port) \ (BUF_xxxx_I + xxx_P_RSRV_x + (port)) /* Amount of frame references * | per QoS class * | | reserved * | | | per egress port * | | | | * V V v v * REF_Q_RSRV_E */ #define REF_Q_RSRV_E(port, prio) \ (REF_xxxx_E + xxx_Q_RSRV_x + OCELOT_NUM_TC * (port) + (prio)) /* Amount of frame references * | for all port's traffic classes * | | reserved * | | | per egress port * | | | | * V V v v * REF_P_RSRV_E */ #define REF_P_RSRV_E(port) \ (REF_xxxx_E + xxx_P_RSRV_x + (port)) /* Amount of frame references * | per QoS class * | | reserved * | | | per ingress port * | | | | * V V v v * REF_Q_RSRV_I */ #define REF_Q_RSRV_I(port, prio) \ (REF_xxxx_I + xxx_Q_RSRV_x + OCELOT_NUM_TC * (port) + (prio)) /* Amount of frame references * | for all port's traffic classes * | | reserved * | | | per ingress port * | | | | * V V v v * REF_P_RSRV_I */ #define REF_P_RSRV_I(port) \ (REF_xxxx_I + xxx_P_RSRV_x + (port)) /* Sharing Watermarks * ------------------ * * The shared memory area is shared between all ports. */ /* Amount of buffer * | per QoS class * | | from the shared memory area * | | | for egress traffic * | | | | * V V v v * BUF_PRIO_SHR_E */ #define BUF_PRIO_SHR_E(prio) \ (BUF_xxxx_E + xxx_PRIO_SHR_x + (prio)) /* Amount of buffer * | per color (drop precedence level) * | | from the shared memory area * | | | for egress traffic * | | | | * V V v v * BUF_COL_SHR_E */ #define BUF_COL_SHR_E(dp) \ (BUF_xxxx_E + xxx_COL_SHR_x + (1 - (dp))) /* Amount of buffer * | per QoS class * | | from the shared memory area * | | | for ingress traffic * | | | | * V V v v * BUF_PRIO_SHR_I */ #define BUF_PRIO_SHR_I(prio) \ (BUF_xxxx_I + xxx_PRIO_SHR_x + (prio)) /* Amount of buffer * | per color (drop precedence level) * | | from the shared memory area * | | | for ingress traffic * | | | | * V V v v * BUF_COL_SHR_I */ #define BUF_COL_SHR_I(dp) \ (BUF_xxxx_I + xxx_COL_SHR_x + (1 - (dp))) /* Amount of frame references * | per QoS class * | | from the shared area * | | | for egress traffic * | | | | * V V v v * REF_PRIO_SHR_E */ #define REF_PRIO_SHR_E(prio) \ (REF_xxxx_E + xxx_PRIO_SHR_x + (prio)) /* Amount of frame references * | per color (drop precedence level) * | | from the shared area * | | | for egress traffic * | | | | * V V v v * REF_COL_SHR_E */ #define REF_COL_SHR_E(dp) \ (REF_xxxx_E + xxx_COL_SHR_x + (1 - (dp))) /* Amount of frame references * | per QoS class * | | from the shared area * | | | for ingress traffic * | | | | * V V v v * REF_PRIO_SHR_I */ #define REF_PRIO_SHR_I(prio) \ (REF_xxxx_I + xxx_PRIO_SHR_x + (prio)) /* Amount of frame references * | per color (drop precedence level) * | | from the shared area * | | | for ingress traffic * | | | | * V V v v * REF_COL_SHR_I */ #define REF_COL_SHR_I(dp) \ (REF_xxxx_I + xxx_COL_SHR_x + (1 - (dp))) static u32 ocelot_wm_read(struct ocelot *ocelot, int index) { int wm = ocelot_read_gix(ocelot, QSYS_RES_CFG, index); return ocelot->ops->wm_dec(wm); } static void ocelot_wm_write(struct ocelot *ocelot, int index, u32 val) { u32 wm = ocelot->ops->wm_enc(val); ocelot_write_gix(ocelot, wm, QSYS_RES_CFG, index); } static void ocelot_wm_status(struct ocelot *ocelot, int index, u32 *inuse, u32 *maxuse) { int res_stat = ocelot_read_gix(ocelot, QSYS_RES_STAT, index); return ocelot->ops->wm_stat(res_stat, inuse, maxuse); } /* The hardware comes out of reset with strange defaults: the sum of all * reservations for frame memory is larger than the total buffer size. * One has to wonder how can the reservation watermarks still guarantee * anything under congestion. * Bring some sense into the hardware by changing the defaults to disable all * reservations and rely only on the sharing watermark for frames with drop * precedence 0. The user can still explicitly request reservations per port * and per port-tc through devlink-sb. */ static void ocelot_disable_reservation_watermarks(struct ocelot *ocelot, int port) { int prio; for (prio = 0; prio < OCELOT_NUM_TC; prio++) { ocelot_wm_write(ocelot, BUF_Q_RSRV_I(port, prio), 0); ocelot_wm_write(ocelot, BUF_Q_RSRV_E(port, prio), 0); ocelot_wm_write(ocelot, REF_Q_RSRV_I(port, prio), 0); ocelot_wm_write(ocelot, REF_Q_RSRV_E(port, prio), 0); } ocelot_wm_write(ocelot, BUF_P_RSRV_I(port), 0); ocelot_wm_write(ocelot, BUF_P_RSRV_E(port), 0); ocelot_wm_write(ocelot, REF_P_RSRV_I(port), 0); ocelot_wm_write(ocelot, REF_P_RSRV_E(port), 0); } /* We want the sharing watermarks to consume all nonreserved resources, for * efficient resource utilization (a single traffic flow should be able to use * up the entire buffer space and frame resources as long as there's no * interference). * The switch has 10 sharing watermarks per lookup: 8 per traffic class and 2 * per color (drop precedence). * The trouble with configuring these sharing watermarks is that: * (1) There's a risk that we overcommit the resources if we configure * (a) all 8 per-TC sharing watermarks to the max * (b) all 2 per-color sharing watermarks to the max * (2) There's a risk that we undercommit the resources if we configure * (a) all 8 per-TC sharing watermarks to "max / 8" * (b) all 2 per-color sharing watermarks to "max / 2" * So for Linux, let's just disable the sharing watermarks per traffic class * (setting them to 0 will make them always exceeded), and rely only on the * sharing watermark for drop priority 0. So frames with drop priority set to 1 * by QoS classification or policing will still be allowed, but only as long as * the port and port-TC reservations are not exceeded. */ static void ocelot_disable_tc_sharing_watermarks(struct ocelot *ocelot) { int prio; for (prio = 0; prio < OCELOT_NUM_TC; prio++) { ocelot_wm_write(ocelot, BUF_PRIO_SHR_I(prio), 0); ocelot_wm_write(ocelot, BUF_PRIO_SHR_E(prio), 0); ocelot_wm_write(ocelot, REF_PRIO_SHR_I(prio), 0); ocelot_wm_write(ocelot, REF_PRIO_SHR_E(prio), 0); } } static void ocelot_get_buf_rsrv(struct ocelot *ocelot, u32 *buf_rsrv_i, u32 *buf_rsrv_e) { int port, prio; *buf_rsrv_i = 0; *buf_rsrv_e = 0; for (port = 0; port <= ocelot->num_phys_ports; port++) { for (prio = 0; prio < OCELOT_NUM_TC; prio++) { *buf_rsrv_i += ocelot_wm_read(ocelot, BUF_Q_RSRV_I(port, prio)); *buf_rsrv_e += ocelot_wm_read(ocelot, BUF_Q_RSRV_E(port, prio)); } *buf_rsrv_i += ocelot_wm_read(ocelot, BUF_P_RSRV_I(port)); *buf_rsrv_e += ocelot_wm_read(ocelot, BUF_P_RSRV_E(port)); } *buf_rsrv_i *= OCELOT_BUFFER_CELL_SZ; *buf_rsrv_e *= OCELOT_BUFFER_CELL_SZ; } static void ocelot_get_ref_rsrv(struct ocelot *ocelot, u32 *ref_rsrv_i, u32 *ref_rsrv_e) { int port, prio; *ref_rsrv_i = 0; *ref_rsrv_e = 0; for (port = 0; port <= ocelot->num_phys_ports; port++) { for (prio = 0; prio < OCELOT_NUM_TC; prio++) { *ref_rsrv_i += ocelot_wm_read(ocelot, REF_Q_RSRV_I(port, prio)); *ref_rsrv_e += ocelot_wm_read(ocelot, REF_Q_RSRV_E(port, prio)); } *ref_rsrv_i += ocelot_wm_read(ocelot, REF_P_RSRV_I(port)); *ref_rsrv_e += ocelot_wm_read(ocelot, REF_P_RSRV_E(port)); } } /* Calculate all reservations, then set up the sharing watermark for DP=0 to * consume the remaining resources up to the pool's configured size. */ static void ocelot_setup_sharing_watermarks(struct ocelot *ocelot) { u32 buf_rsrv_i, buf_rsrv_e; u32 ref_rsrv_i, ref_rsrv_e; u32 buf_shr_i, buf_shr_e; u32 ref_shr_i, ref_shr_e; ocelot_get_buf_rsrv(ocelot, &buf_rsrv_i, &buf_rsrv_e); ocelot_get_ref_rsrv(ocelot, &ref_rsrv_i, &ref_rsrv_e); buf_shr_i = ocelot->pool_size[OCELOT_SB_BUF][OCELOT_SB_POOL_ING] - buf_rsrv_i; buf_shr_e = ocelot->pool_size[OCELOT_SB_BUF][OCELOT_SB_POOL_EGR] - buf_rsrv_e; ref_shr_i = ocelot->pool_size[OCELOT_SB_REF][OCELOT_SB_POOL_ING] - ref_rsrv_i; ref_shr_e = ocelot->pool_size[OCELOT_SB_REF][OCELOT_SB_POOL_EGR] - ref_rsrv_e; buf_shr_i /= OCELOT_BUFFER_CELL_SZ; buf_shr_e /= OCELOT_BUFFER_CELL_SZ; ocelot_wm_write(ocelot, BUF_COL_SHR_I(0), buf_shr_i); ocelot_wm_write(ocelot, BUF_COL_SHR_E(0), buf_shr_e); ocelot_wm_write(ocelot, REF_COL_SHR_E(0), ref_shr_e); ocelot_wm_write(ocelot, REF_COL_SHR_I(0), ref_shr_i); ocelot_wm_write(ocelot, BUF_COL_SHR_I(1), 0); ocelot_wm_write(ocelot, BUF_COL_SHR_E(1), 0); ocelot_wm_write(ocelot, REF_COL_SHR_E(1), 0); ocelot_wm_write(ocelot, REF_COL_SHR_I(1), 0); } /* Ensure that all reservations can be enforced */ static int ocelot_watermark_validate(struct ocelot *ocelot, struct netlink_ext_ack *extack) { u32 buf_rsrv_i, buf_rsrv_e; u32 ref_rsrv_i, ref_rsrv_e; ocelot_get_buf_rsrv(ocelot, &buf_rsrv_i, &buf_rsrv_e); ocelot_get_ref_rsrv(ocelot, &ref_rsrv_i, &ref_rsrv_e); if (buf_rsrv_i > ocelot->pool_size[OCELOT_SB_BUF][OCELOT_SB_POOL_ING]) { NL_SET_ERR_MSG_MOD(extack, "Ingress frame reservations exceed pool size"); return -ERANGE; } if (buf_rsrv_e > ocelot->pool_size[OCELOT_SB_BUF][OCELOT_SB_POOL_EGR]) { NL_SET_ERR_MSG_MOD(extack, "Egress frame reservations exceed pool size"); return -ERANGE; } if (ref_rsrv_i > ocelot->pool_size[OCELOT_SB_REF][OCELOT_SB_POOL_ING]) { NL_SET_ERR_MSG_MOD(extack, "Ingress reference reservations exceed pool size"); return -ERANGE; } if (ref_rsrv_e > ocelot->pool_size[OCELOT_SB_REF][OCELOT_SB_POOL_EGR]) { NL_SET_ERR_MSG_MOD(extack, "Egress reference reservations exceed pool size"); return -ERANGE; } return 0; } /* The hardware works like this: * * Frame forwarding decision taken * | * v * +--------------------+--------------------+--------------------+ * | | | | * v v v v * Ingress memory Egress memory Ingress frame Egress frame * check check reference check reference check * | | | | * v v v v * BUF_Q_RSRV_I ok BUF_Q_RSRV_E ok REF_Q_RSRV_I ok REF_Q_RSRV_E ok *(src port, prio) -+ (dst port, prio) -+ (src port, prio) -+ (dst port, prio) -+ * | | | | | | | | * |exceeded | |exceeded | |exceeded | |exceeded | * v | v | v | v | * BUF_P_RSRV_I ok| BUF_P_RSRV_E ok| REF_P_RSRV_I ok| REF_P_RSRV_E ok| * (src port) ----+ (dst port) ----+ (src port) ----+ (dst port) -----+ * | | | | | | | | * |exceeded | |exceeded | |exceeded | |exceeded | * v | v | v | v | * BUF_PRIO_SHR_I ok| BUF_PRIO_SHR_E ok| REF_PRIO_SHR_I ok| REF_PRIO_SHR_E ok| * (prio) ------+ (prio) ------+ (prio) ------+ (prio) -------+ * | | | | | | | | * |exceeded | |exceeded | |exceeded | |exceeded | * v | v | v | v | * BUF_COL_SHR_I ok| BUF_COL_SHR_E ok| REF_COL_SHR_I ok| REF_COL_SHR_E ok| * (dp) -------+ (dp) -------+ (dp) -------+ (dp) --------+ * | | | | | | | | * |exceeded | |exceeded | |exceeded | |exceeded | * v v v v v v v v * fail success fail success fail success fail success * | | | | | | | | * v v v v v v v v * +-----+----+ +-----+----+ +-----+----+ +-----+-----+ * | | | | * +-------> OR <-------+ +-------> OR <-------+ * | | * v v * +----------------> AND <-----------------+ * | * v * FIFO drop / accept * * We are modeling each of the 4 parallel lookups as a devlink-sb pool. * At least one (ingress or egress) memory pool and one (ingress or egress) * frame reference pool need to have resources for frame acceptance to succeed. * * The following watermarks are controlled explicitly through devlink-sb: * BUF_Q_RSRV_I, BUF_Q_RSRV_E, REF_Q_RSRV_I, REF_Q_RSRV_E * BUF_P_RSRV_I, BUF_P_RSRV_E, REF_P_RSRV_I, REF_P_RSRV_E * The following watermarks are controlled implicitly through devlink-sb: * BUF_COL_SHR_I, BUF_COL_SHR_E, REF_COL_SHR_I, REF_COL_SHR_E * The following watermarks are unused and disabled: * BUF_PRIO_SHR_I, BUF_PRIO_SHR_E, REF_PRIO_SHR_I, REF_PRIO_SHR_E * * This function overrides the hardware defaults with more sane ones (no * reservations by default, let sharing use all resources) and disables the * unused watermarks. */ static void ocelot_watermark_init(struct ocelot *ocelot) { int all_tcs = GENMASK(OCELOT_NUM_TC - 1, 0); int port; ocelot_write(ocelot, all_tcs, QSYS_RES_QOS_MODE); for (port = 0; port <= ocelot->num_phys_ports; port++) ocelot_disable_reservation_watermarks(ocelot, port); ocelot_disable_tc_sharing_watermarks(ocelot); ocelot_setup_sharing_watermarks(ocelot); } /* Watermark encode * Bit 8: Unit; 0:1, 1:16 * Bit 7-0: Value to be multiplied with unit */ u16 ocelot_wm_enc(u16 value) { WARN_ON(value >= 16 * BIT(8)); if (value >= BIT(8)) return BIT(8) | (value / 16); return value; } EXPORT_SYMBOL(ocelot_wm_enc); u16 ocelot_wm_dec(u16 wm) { if (wm & BIT(8)) return (wm & GENMASK(7, 0)) * 16; return wm; } EXPORT_SYMBOL(ocelot_wm_dec); void ocelot_wm_stat(u32 val, u32 *inuse, u32 *maxuse) { *inuse = (val & GENMASK(23, 12)) >> 12; *maxuse = val & GENMASK(11, 0); } EXPORT_SYMBOL(ocelot_wm_stat); /* Pool size and type are fixed up at runtime. Keeping this structure to * look up the cell size multipliers. */ static const struct devlink_sb_pool_info ocelot_sb_pool[] = { [OCELOT_SB_BUF] = { .cell_size = OCELOT_BUFFER_CELL_SZ, .threshold_type = DEVLINK_SB_THRESHOLD_TYPE_STATIC, }, [OCELOT_SB_REF] = { .cell_size = 1, .threshold_type = DEVLINK_SB_THRESHOLD_TYPE_STATIC, }, }; /* Returns the pool size configured through ocelot_sb_pool_set */ int ocelot_sb_pool_get(struct ocelot *ocelot, unsigned int sb_index, u16 pool_index, struct devlink_sb_pool_info *pool_info) { if (sb_index >= OCELOT_SB_NUM) return -ENODEV; if (pool_index >= OCELOT_SB_POOL_NUM) return -ENODEV; *pool_info = ocelot_sb_pool[sb_index]; pool_info->size = ocelot->pool_size[sb_index][pool_index]; if (pool_index) pool_info->pool_type = DEVLINK_SB_POOL_TYPE_INGRESS; else pool_info->pool_type = DEVLINK_SB_POOL_TYPE_EGRESS; return 0; } EXPORT_SYMBOL(ocelot_sb_pool_get); /* The pool size received here configures the total amount of resources used on * ingress (or on egress, depending upon the pool index). The pool size, minus * the values for the port and port-tc reservations, is written into the * COL_SHR(dp=0) sharing watermark. */ int 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) { u32 old_pool_size; int err; if (sb_index >= OCELOT_SB_NUM) { NL_SET_ERR_MSG_MOD(extack, "Invalid sb, use 0 for buffers and 1 for frame references"); return -ENODEV; } if (pool_index >= OCELOT_SB_POOL_NUM) { NL_SET_ERR_MSG_MOD(extack, "Invalid pool, use 0 for ingress and 1 for egress"); return -ENODEV; } if (threshold_type != DEVLINK_SB_THRESHOLD_TYPE_STATIC) { NL_SET_ERR_MSG_MOD(extack, "Only static threshold supported"); return -EOPNOTSUPP; } old_pool_size = ocelot->pool_size[sb_index][pool_index]; ocelot->pool_size[sb_index][pool_index] = size; err = ocelot_watermark_validate(ocelot, extack); if (err) { ocelot->pool_size[sb_index][pool_index] = old_pool_size; return err; } ocelot_setup_sharing_watermarks(ocelot); return 0; } EXPORT_SYMBOL(ocelot_sb_pool_set); /* This retrieves the configuration made with ocelot_sb_port_pool_set */ int ocelot_sb_port_pool_get(struct ocelot *ocelot, int port, unsigned int sb_index, u16 pool_index, u32 *p_threshold) { int wm_index; switch (sb_index) { case OCELOT_SB_BUF: if (pool_index == OCELOT_SB_POOL_ING) wm_index = BUF_P_RSRV_I(port); else wm_index = BUF_P_RSRV_E(port); break; case OCELOT_SB_REF: if (pool_index == OCELOT_SB_POOL_ING) wm_index = REF_P_RSRV_I(port); else wm_index = REF_P_RSRV_E(port); break; default: return -ENODEV; } *p_threshold = ocelot_wm_read(ocelot, wm_index); *p_threshold *= ocelot_sb_pool[sb_index].cell_size; return 0; } EXPORT_SYMBOL(ocelot_sb_port_pool_get); /* This configures the P_RSRV per-port reserved resource watermark */ int ocelot_sb_port_pool_set(struct ocelot *ocelot, int port, unsigned int sb_index, u16 pool_index, u32 threshold, struct netlink_ext_ack *extack) { int wm_index, err; u32 old_thr; switch (sb_index) { case OCELOT_SB_BUF: if (pool_index == OCELOT_SB_POOL_ING) wm_index = BUF_P_RSRV_I(port); else wm_index = BUF_P_RSRV_E(port); break; case OCELOT_SB_REF: if (pool_index == OCELOT_SB_POOL_ING) wm_index = REF_P_RSRV_I(port); else wm_index = REF_P_RSRV_E(port); break; default: NL_SET_ERR_MSG_MOD(extack, "Invalid shared buffer"); return -ENODEV; } threshold /= ocelot_sb_pool[sb_index].cell_size; old_thr = ocelot_wm_read(ocelot, wm_index); ocelot_wm_write(ocelot, wm_index, threshold); err = ocelot_watermark_validate(ocelot, extack); if (err) { ocelot_wm_write(ocelot, wm_index, old_thr); return err; } ocelot_setup_sharing_watermarks(ocelot); return 0; } EXPORT_SYMBOL(ocelot_sb_port_pool_set); /* This retrieves the configuration done by ocelot_sb_tc_pool_bind_set */ int 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) { int wm_index; switch (sb_index) { case OCELOT_SB_BUF: if (pool_type == DEVLINK_SB_POOL_TYPE_INGRESS) wm_index = BUF_Q_RSRV_I(port, tc_index); else wm_index = BUF_Q_RSRV_E(port, tc_index); break; case OCELOT_SB_REF: if (pool_type == DEVLINK_SB_POOL_TYPE_INGRESS) wm_index = REF_Q_RSRV_I(port, tc_index); else wm_index = REF_Q_RSRV_E(port, tc_index); break; default: return -ENODEV; } *p_threshold = ocelot_wm_read(ocelot, wm_index); *p_threshold *= ocelot_sb_pool[sb_index].cell_size; if (pool_type == DEVLINK_SB_POOL_TYPE_INGRESS) *p_pool_index = 0; else *p_pool_index = 1; return 0; } EXPORT_SYMBOL(ocelot_sb_tc_pool_bind_get); /* This configures the Q_RSRV per-port-tc reserved resource watermark */ int 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) { int wm_index, err; u32 old_thr; /* Paranoid check? */ if (pool_index == OCELOT_SB_POOL_ING && pool_type != DEVLINK_SB_POOL_TYPE_INGRESS) return -EINVAL; if (pool_index == OCELOT_SB_POOL_EGR && pool_type != DEVLINK_SB_POOL_TYPE_EGRESS) return -EINVAL; switch (sb_index) { case OCELOT_SB_BUF: if (pool_type == DEVLINK_SB_POOL_TYPE_INGRESS) wm_index = BUF_Q_RSRV_I(port, tc_index); else wm_index = BUF_Q_RSRV_E(port, tc_index); break; case OCELOT_SB_REF: if (pool_type == DEVLINK_SB_POOL_TYPE_INGRESS) wm_index = REF_Q_RSRV_I(port, tc_index); else wm_index = REF_Q_RSRV_E(port, tc_index); break; default: NL_SET_ERR_MSG_MOD(extack, "Invalid shared buffer"); return -ENODEV; } threshold /= ocelot_sb_pool[sb_index].cell_size; old_thr = ocelot_wm_read(ocelot, wm_index); ocelot_wm_write(ocelot, wm_index, threshold); err = ocelot_watermark_validate(ocelot, extack); if (err) { ocelot_wm_write(ocelot, wm_index, old_thr); return err; } ocelot_setup_sharing_watermarks(ocelot); return 0; } EXPORT_SYMBOL(ocelot_sb_tc_pool_bind_set); /* The hardware does not support atomic snapshots, we'll read out the * occupancy registers individually and have this as just a stub. */ int ocelot_sb_occ_snapshot(struct ocelot *ocelot, unsigned int sb_index) { return 0; } EXPORT_SYMBOL(ocelot_sb_occ_snapshot); /* The watermark occupancy registers are cleared upon read, * so let's read them. */ int ocelot_sb_occ_max_clear(struct ocelot *ocelot, unsigned int sb_index) { u32 inuse, maxuse; int port, prio; switch (sb_index) { case OCELOT_SB_BUF: for (port = 0; port <= ocelot->num_phys_ports; port++) { for (prio = 0; prio < OCELOT_NUM_TC; prio++) { ocelot_wm_status(ocelot, BUF_Q_RSRV_I(port, prio), &inuse, &maxuse); ocelot_wm_status(ocelot, BUF_Q_RSRV_E(port, prio), &inuse, &maxuse); } ocelot_wm_status(ocelot, BUF_P_RSRV_I(port), &inuse, &maxuse); ocelot_wm_status(ocelot, BUF_P_RSRV_E(port), &inuse, &maxuse); } break; case OCELOT_SB_REF: for (port = 0; port <= ocelot->num_phys_ports; port++) { for (prio = 0; prio < OCELOT_NUM_TC; prio++) { ocelot_wm_status(ocelot, REF_Q_RSRV_I(port, prio), &inuse, &maxuse); ocelot_wm_status(ocelot, REF_Q_RSRV_E(port, prio), &inuse, &maxuse); } ocelot_wm_status(ocelot, REF_P_RSRV_I(port), &inuse, &maxuse); ocelot_wm_status(ocelot, REF_P_RSRV_E(port), &inuse, &maxuse); } break; default: return -ENODEV; } return 0; } EXPORT_SYMBOL(ocelot_sb_occ_max_clear); /* This retrieves the watermark occupancy for per-port P_RSRV watermarks */ int ocelot_sb_occ_port_pool_get(struct ocelot *ocelot, int port, unsigned int sb_index, u16 pool_index, u32 *p_cur, u32 *p_max) { int wm_index; switch (sb_index) { case OCELOT_SB_BUF: if (pool_index == OCELOT_SB_POOL_ING) wm_index = BUF_P_RSRV_I(port); else wm_index = BUF_P_RSRV_E(port); break; case OCELOT_SB_REF: if (pool_index == OCELOT_SB_POOL_ING) wm_index = REF_P_RSRV_I(port); else wm_index = REF_P_RSRV_E(port); break; default: return -ENODEV; } ocelot_wm_status(ocelot, wm_index, p_cur, p_max); *p_cur *= ocelot_sb_pool[sb_index].cell_size; *p_max *= ocelot_sb_pool[sb_index].cell_size; return 0; } EXPORT_SYMBOL(ocelot_sb_occ_port_pool_get); /* This retrieves the watermark occupancy for per-port-tc Q_RSRV watermarks */ int 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) { int wm_index; switch (sb_index) { case OCELOT_SB_BUF: if (pool_type == DEVLINK_SB_POOL_TYPE_INGRESS) wm_index = BUF_Q_RSRV_I(port, tc_index); else wm_index = BUF_Q_RSRV_E(port, tc_index); break; case OCELOT_SB_REF: if (pool_type == DEVLINK_SB_POOL_TYPE_INGRESS) wm_index = REF_Q_RSRV_I(port, tc_index); else wm_index = REF_Q_RSRV_E(port, tc_index); break; default: return -ENODEV; } ocelot_wm_status(ocelot, wm_index, p_cur, p_max); *p_cur *= ocelot_sb_pool[sb_index].cell_size; *p_max *= ocelot_sb_pool[sb_index].cell_size; return 0; } EXPORT_SYMBOL(ocelot_sb_occ_tc_port_bind_get); int ocelot_devlink_sb_register(struct ocelot *ocelot) { int err; err = devlink_sb_register(ocelot->devlink, OCELOT_SB_BUF, ocelot->packet_buffer_size, 1, 1, OCELOT_NUM_TC, OCELOT_NUM_TC); if (err) return err; err = devlink_sb_register(ocelot->devlink, OCELOT_SB_REF, ocelot->num_frame_refs, 1, 1, OCELOT_NUM_TC, OCELOT_NUM_TC); if (err) { devlink_sb_unregister(ocelot->devlink, OCELOT_SB_BUF); return err; } ocelot->pool_size[OCELOT_SB_BUF][OCELOT_SB_POOL_ING] = ocelot->packet_buffer_size; ocelot->pool_size[OCELOT_SB_BUF][OCELOT_SB_POOL_EGR] = ocelot->packet_buffer_size; ocelot->pool_size[OCELOT_SB_REF][OCELOT_SB_POOL_ING] = ocelot->num_frame_refs; ocelot->pool_size[OCELOT_SB_REF][OCELOT_SB_POOL_EGR] = ocelot->num_frame_refs; ocelot_watermark_init(ocelot); return 0; } EXPORT_SYMBOL(ocelot_devlink_sb_register); void ocelot_devlink_sb_unregister(struct ocelot *ocelot) { devlink_sb_unregister(ocelot->devlink, OCELOT_SB_BUF); devlink_sb_unregister(ocelot->devlink, OCELOT_SB_REF); } EXPORT_SYMBOL(ocelot_devlink_sb_unregister); |