drivers/net/ethernet/chelsio/cxgb4/cxgb4_dcb.h

   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  */
  63 enum 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  */
  72 enum 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  */
  84 enum 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  */
  96 struct 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
 120 void cxgb4_dcb_state_init(struct net_device *);
 121 void cxgb4_dcb_version_init(struct net_device *);
 122 void cxgb4_dcb_reset(struct net_device *dev);
 123 void cxgb4_dcb_state_fsm(struct net_device *, enum cxgb4_dcb_state_input);
 124 void cxgb4_dcb_handle_fw_update(struct adapter *, const struct fw_port_cmd *);
 125 void cxgb4_dcb_set_caps(struct adapter *, const struct fw_port_cmd *);
 126 extern const struct dcbnl_rtnl_ops cxgb4_dcb_ops;
 127
 128 static 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 #define CXGB4_DCB_ENABLED true
 140
 141 #else /* !CONFIG_CHELSIO_T4_DCB */
 142
 143 static inline void cxgb4_dcb_state_init(struct net_device *dev)
 144 {
 145 }
 146
 147 #define CXGB4_DCB_ENABLED false
 148
 149 #endif /* !CONFIG_CHELSIO_T4_DCB */
 150
 151 #endif /* __CXGB4_DCB_H */