LXR linux/drivers/net/ethernet/chelsio/cxgb4/cxgb4

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 *  Copyright (C) 2013-2014 Chelsio Communications.  All rights reserved.
   4 *
   5 *  Written by Anish Bhatt (anish@chelsio.com)
   6 */
   7
   8#ifndef __CXGB4_DCB_H
   9#define __CXGB4_DCB_H
  10
  11#include <linux/netdevice.h>
  12#include <linux/dcbnl.h>
  13#include <net/dcbnl.h>
  14
  15#ifdef CONFIG_CHELSIO_T4_DCB
  16
  17#define CXGB4_DCBX_FW_SUPPORT \
  18        (DCB_CAP_DCBX_VER_CEE | \
  19         DCB_CAP_DCBX_VER_IEEE | \
  20         DCB_CAP_DCBX_LLD_MANAGED)
  21#define CXGB4_DCBX_HOST_SUPPORT \
  22        (DCB_CAP_DCBX_VER_CEE | \
  23         DCB_CAP_DCBX_VER_IEEE | \
  24         DCB_CAP_DCBX_HOST)
  25
  26#define CXGB4_MAX_PRIORITY      CXGB4_MAX_DCBX_APP_SUPPORTED
  27#define CXGB4_MAX_TCS           CXGB4_MAX_DCBX_APP_SUPPORTED
  28
  29#define INIT_PORT_DCB_CMD(__pcmd, __port, __op, __action) \
  30        do { \
  31                memset(&(__pcmd), 0, sizeof(__pcmd)); \
  32                (__pcmd).op_to_portid = \
  33                        cpu_to_be32(FW_CMD_OP_V(FW_PORT_CMD) | \
  34                                    FW_CMD_REQUEST_F | \
  35                                    FW_CMD_##__op##_F | \
  36                                    FW_PORT_CMD_PORTID_V(__port)); \
  37                (__pcmd).action_to_len16 = \
  38                        cpu_to_be32(FW_PORT_CMD_ACTION_V(__action) | \
  39                                    FW_LEN16(pcmd)); \
  40        } while (0)
  41
  42#define INIT_PORT_DCB_READ_PEER_CMD(__pcmd, __port) \
  43        INIT_PORT_DCB_CMD(__pcmd, __port, READ, FW_PORT_ACTION_DCB_READ_RECV)
  44
  45#define INIT_PORT_DCB_READ_LOCAL_CMD(__pcmd, __port) \
  46        INIT_PORT_DCB_CMD(__pcmd, __port, READ, FW_PORT_ACTION_DCB_READ_TRANS)
  47
  48#define INIT_PORT_DCB_READ_SYNC_CMD(__pcmd, __port) \
  49        INIT_PORT_DCB_CMD(__pcmd, __port, READ, FW_PORT_ACTION_DCB_READ_DET)
  50
  51#define INIT_PORT_DCB_WRITE_CMD(__pcmd, __port) \
  52        INIT_PORT_DCB_CMD(__pcmd, __port, EXEC, FW_PORT_ACTION_L2_DCB_CFG)
  53
  54#define IEEE_FAUX_SYNC(__dev, __dcb) \
  55        do { \
  56                if ((__dcb)->dcb_version == FW_PORT_DCB_VER_IEEE) \
  57                        cxgb4_dcb_state_fsm((__dev), \
  58                                            CXGB4_DCB_INPUT_FW_ALLSYNCED); \
  59        } while (0)
  60
  61/* States we can be in for a port's Data Center Bridging.
  62 */
  63enum cxgb4_dcb_state {
  64        CXGB4_DCB_STATE_START,          /* initial unknown state */
  65        CXGB4_DCB_STATE_HOST,           /* we're using Host DCB (if at all) */
  66        CXGB4_DCB_STATE_FW_INCOMPLETE,  /* using firmware DCB, incomplete */
  67        CXGB4_DCB_STATE_FW_ALLSYNCED,   /* using firmware DCB, all sync'ed */
  68};
  69
  70/* Data Center Bridging state input for the Finite State Machine.
  71 */
  72enum cxgb4_dcb_state_input {
  73        /* Input from the firmware.
  74         */
  75        CXGB4_DCB_INPUT_FW_DISABLED,    /* firmware DCB disabled */
  76        CXGB4_DCB_INPUT_FW_ENABLED,     /* firmware DCB enabled */
  77        CXGB4_DCB_INPUT_FW_INCOMPLETE,  /* firmware reports incomplete DCB */
  78        CXGB4_DCB_INPUT_FW_ALLSYNCED,   /* firmware reports all sync'ed */
  79
  80};
  81
  82/* Firmware DCB messages that we've received so far ...
  83 */
  84enum cxgb4_dcb_fw_msgs {
  85        CXGB4_DCB_FW_PGID       = 0x01,
  86        CXGB4_DCB_FW_PGRATE     = 0x02,
  87        CXGB4_DCB_FW_PRIORATE   = 0x04,
  88        CXGB4_DCB_FW_PFC        = 0x08,
  89        CXGB4_DCB_FW_APP_ID     = 0x10,
  90};
  91
  92#define CXGB4_MAX_DCBX_APP_SUPPORTED 8
  93
  94/* Data Center Bridging support;
  95 */
  96struct port_dcb_info {
  97        enum cxgb4_dcb_state state;     /* DCB State Machine */
  98        enum cxgb4_dcb_fw_msgs msgs;    /* DCB Firmware messages received */
  99        unsigned int supported;         /* OS DCB capabilities supported */
 100        bool enabled;                   /* OS Enabled state */
 101
 102        /* Cached copies of DCB information sent by the firmware (in Host
 103         * Native Endian format).
 104         */
 105        u32     pgid;                   /* Priority Group[0..7] */
 106        u8      dcb_version;            /* Running DCBx version */
 107        u8      pfcen;                  /* Priority Flow Control[0..7] */
 108        u8      pg_num_tcs_supported;   /* max PG Traffic Classes */
 109        u8      pfc_num_tcs_supported;  /* max PFC Traffic Classes */
 110        u8      pgrate[8];              /* Priority Group Rate[0..7] */
 111        u8      priorate[8];            /* Priority Rate[0..7] */
 112        u8      tsa[8];                 /* TSA Algorithm[0..7] */
 113        struct app_priority { /* Application Information */
 114                u8      user_prio_map;  /* Priority Map bitfield */
 115                u8      sel_field;      /* Protocol ID interpretation */
 116                u16     protocolid;     /* Protocol ID */
 117        } app_priority[CXGB4_MAX_DCBX_APP_SUPPORTED];
 118};
 119
 120void cxgb4_dcb_state_init(struct net_device *);
 121void cxgb4_dcb_version_init(struct net_device *);
 122void cxgb4_dcb_reset(struct net_device *dev);
 123void cxgb4_dcb_state_fsm(struct net_device *, enum cxgb4_dcb_state_input);
 124void cxgb4_dcb_handle_fw_update(struct adapter *, const struct fw_port_cmd *);
 125void cxgb4_dcb_set_caps(struct adapter *, const struct fw_port_cmd *);
 126extern const struct dcbnl_rtnl_ops cxgb4_dcb_ops;
 127
 128static inline __u8 bitswap_1(unsigned char val)
 129{
 130        return ((val & 0x80) >> 7) |
 131               ((val & 0x40) >> 5) |
 132               ((val & 0x20) >> 3) |
 133               ((val & 0x10) >> 1) |
 134               ((val & 0x08) << 1) |
 135               ((val & 0x04) << 3) |
 136               ((val & 0x02) << 5) |
 137               ((val & 0x01) << 7);
 138}
 139
 140extern const char * const dcb_ver_array[];
 141
 142#define CXGB4_DCB_ENABLED true
 143
 144#else /* !CONFIG_CHELSIO_T4_DCB */
 145
 146static inline void cxgb4_dcb_state_init(struct net_device *dev)
 147{
 148}
 149
 150#define CXGB4_DCB_ENABLED false
 151
 152#endif /* !CONFIG_CHELSIO_T4_DCB */
 153
 154#endif /* __CXGB4_DCB_H */
 155