ceph/src/seastar/dpdk/drivers/net/ark/ark_mpu.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright (c) 2015-2018 Atomic Rules LLC
   3  */
   4
   5 #ifndef _ARK_MPU_H_
   6 #define _ARK_MPU_H_
   7
   8 #include <stdint.h>
   9
  10 #include <rte_memory.h>
  11
  12 /* The MPU or Memory Prefetch Unit is an internal Arkville hardware
  13  * module for moving data between host memory and the hardware FPGA.
  14  * This module is *not* intended for end-user manipulation, hence
  15  * there is minimal documentation.
  16  */
  17
  18 /*
  19  * MPU hardware structures
  20  * These are overlay structures to a memory mapped FPGA device.  These
  21  * structs will never be instantiated in ram memory
  22  */
  23
  24 #define ARK_MPU_ID 0x00
  25 struct ark_mpu_id_t {
  26         union {
  27                 char id[4];
  28                 uint32_t idnum;
  29         };
  30         union {
  31                 char ver[4];
  32                 uint32_t vernum;
  33         };
  34         uint32_t phys_id;
  35         uint32_t mrr_code;
  36 };
  37
  38 #define ARK_MPU_HW 0x010
  39 struct ark_mpu_hw_t {
  40         uint16_t num_queues;
  41         uint16_t reserved;
  42         uint32_t hw_depth;
  43         uint32_t obj_size;
  44         uint32_t obj_per_mrr;
  45 };
  46
  47 #define ARK_MPU_CFG 0x040
  48 struct ark_mpu_cfg_t {
  49         rte_iova_t ring_base;   /* rte_iova_t is a uint64_t */
  50         uint32_t ring_size;
  51         uint32_t ring_mask;
  52         uint32_t min_host_move;
  53         uint32_t min_hw_move;
  54         volatile uint32_t sw_prod_index;
  55         volatile uint32_t hw_cons_index;
  56         volatile uint32_t command;
  57 };
  58 enum ARK_MPU_COMMAND {
  59         MPU_CMD_IDLE = 1,
  60         MPU_CMD_RUN = 2,
  61         MPU_CMD_STOP = 4,
  62         MPU_CMD_RESET = 8,
  63         MPU_CMD_FORCE_RESET = 16,
  64         MPU_COMMAND_LIMIT = 0xfFFFFFFF
  65 };
  66
  67 #define ARK_MPU_STATS 0x080
  68 struct ark_mpu_stats_t {
  69         volatile uint64_t pci_request;
  70         volatile uint64_t q_empty;
  71         volatile uint64_t q_q1;
  72         volatile uint64_t q_q2;
  73         volatile uint64_t q_q3;
  74         volatile uint64_t q_q4;
  75         volatile uint64_t q_full;
  76 };
  77
  78 #define ARK_MPU_DEBUG 0x0C0
  79 struct ark_mpu_debug_t {
  80         volatile uint32_t state;
  81         uint32_t reserved;
  82         volatile uint32_t count;
  83         volatile uint32_t take;
  84         volatile uint32_t peek[4];
  85 };
  86
  87 /*  Consolidated structure */
  88 struct ark_mpu_t {
  89         struct ark_mpu_id_t id;
  90         uint8_t reserved0[(ARK_MPU_HW - ARK_MPU_ID)
  91                           - sizeof(struct ark_mpu_id_t)];
  92         struct ark_mpu_hw_t hw;
  93         uint8_t reserved1[(ARK_MPU_CFG - ARK_MPU_HW) -
  94                           sizeof(struct ark_mpu_hw_t)];
  95         struct ark_mpu_cfg_t cfg;
  96         uint8_t reserved2[(ARK_MPU_STATS - ARK_MPU_CFG) -
  97                           sizeof(struct ark_mpu_cfg_t)];
  98         struct ark_mpu_stats_t stats;
  99         uint8_t reserved3[(ARK_MPU_DEBUG - ARK_MPU_STATS) -
 100                           sizeof(struct ark_mpu_stats_t)];
 101         struct ark_mpu_debug_t debug;
 102 };
 103
 104 uint16_t ark_api_num_queues(struct ark_mpu_t *mpu);
 105 uint16_t ark_api_num_queues_per_port(struct ark_mpu_t *mpu,
 106                                      uint16_t ark_ports);
 107 int ark_mpu_verify(struct ark_mpu_t *mpu, uint32_t obj_size);
 108 void ark_mpu_stop(struct ark_mpu_t *mpu);
 109 void ark_mpu_start(struct ark_mpu_t *mpu);
 110 int ark_mpu_reset(struct ark_mpu_t *mpu);
 111 int ark_mpu_configure(struct ark_mpu_t *mpu, rte_iova_t ring,
 112                       uint32_t ring_size, int is_tx);
 113
 114 void ark_mpu_dump(struct ark_mpu_t *mpu, const char *msg, uint16_t idx);
 115 void ark_mpu_dump_setup(struct ark_mpu_t *mpu, uint16_t qid);
 116 void ark_mpu_reset_stats(struct ark_mpu_t *mpu);
 117
 118 /*  this action is in a performance critical path */
 119 static inline void
 120 ark_mpu_set_producer(struct ark_mpu_t *mpu, uint32_t idx)
 121 {
 122         mpu->cfg.sw_prod_index = idx;
 123 }
 124
 125 #endif