drivers/net/ethernet/cavium/liquidio/octeon_nic.h

   1 /**********************************************************************
   2  * Author: Cavium, Inc.
   3  *
   4  * Contact: support@cavium.com
   5  *          Please include "LiquidIO" in the subject.
   6  *
   7  * Copyright (c) 2003-2016 Cavium, Inc.
   8  *
   9  * This file is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License, Version 2, as
  11  * published by the Free Software Foundation.
  12  *
  13  * This file is distributed in the hope that it will be useful, but
  14  * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
  15  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
  16  * NONINFRINGEMENT.  See the GNU General Public License for more
  17  * details.
  18  **********************************************************************/
  19
  20 /*!  \file octeon_nic.h
  21  *   \brief Host NIC Driver: Routine to send network data &
  22  *   control packet to Octeon.
  23  */
  24
  25 #ifndef __OCTEON_NIC_H__
  26 #define  __OCTEON_NIC_H__
  27
  28 /* Maximum number of 8-byte words can be sent in a NIC control message.
  29  */
  30 #define  MAX_NCTRL_UDD  32
  31
  32 typedef void (*octnic_ctrl_pkt_cb_fn_t) (void *);
  33
  34 /* Structure of control information passed by the NIC module to the OSI
  35  * layer when sending control commands to Octeon device software.
  36  */
  37 struct octnic_ctrl_pkt {
  38         /** Command to be passed to the Octeon device software. */
  39         union octnet_cmd ncmd;
  40
  41         /** Send buffer  */
  42         void *data;
  43         u64 dmadata;
  44
  45         /** Response buffer */
  46         void *rdata;
  47         u64 dmardata;
  48
  49         /** Additional data that may be needed by some commands. */
  50         u64 udd[MAX_NCTRL_UDD];
  51
  52         /** Input queue to use to send this command. */
  53         u64 iq_no;
  54
  55         /** Time to wait for Octeon software to respond to this control command.
  56          *  If wait_time is 0, OSI assumes no response is expected.
  57          */
  58         size_t wait_time;
  59
  60         /** The network device that issued the control command. */
  61         u64 netpndev;
  62
  63         /** Callback function called when the command has been fetched */
  64         octnic_ctrl_pkt_cb_fn_t cb_fn;
  65
  66         u32 status;
  67         u16 *response_code;
  68         struct completion *completion;
  69 };
  70
  71 #define MAX_UDD_SIZE(nctrl) (sizeof((nctrl)->udd))
  72
  73 /** Structure of data information passed by the NIC module to the OSI
  74  * layer when forwarding data to Octeon device software.
  75  */
  76 struct octnic_data_pkt {
  77         /** Pointer to information maintained by NIC module for this packet. The
  78          *  OSI layer passes this as-is to the driver.
  79          */
  80         void *buf;
  81
  82         /** Type of buffer passed in "buf" above. */
  83         u32 reqtype;
  84
  85         /** Total data bytes to be transferred in this command. */
  86         u32 datasize;
  87
  88         /** Command to be passed to the Octeon device software. */
  89         union octeon_instr_64B cmd;
  90
  91         /** Input queue to use to send this command. */
  92         u32 q_no;
  93
  94 };
  95
  96 /** Structure passed by NIC module to OSI layer to prepare a command to send
  97  * network data to Octeon.
  98  */
  99 union octnic_cmd_setup {
 100         struct {
 101                 u32 iq_no:8;
 102                 u32 gather:1;
 103                 u32 timestamp:1;
 104                 u32 ip_csum:1;
 105                 u32 transport_csum:1;
 106                 u32 tnl_csum:1;
 107                 u32 rsvd:19;
 108
 109                 union {
 110                         u32 datasize;
 111                         u32 gatherptrs;
 112                 } u;
 113         } s;
 114
 115         u64 u64;
 116
 117 };
 118
 119 static inline int octnet_iq_is_full(struct octeon_device *oct, u32 q_no)
 120 {
 121         return ((u32)atomic_read(&oct->instr_queue[q_no]->instr_pending)
 122                 >= (oct->instr_queue[q_no]->max_count - 2));
 123 }
 124
 125 static inline void
 126 octnet_prepare_pci_cmd_o2(struct octeon_device *oct,
 127                           union octeon_instr_64B *cmd,
 128                           union octnic_cmd_setup *setup, u32 tag)
 129 {
 130         struct octeon_instr_ih2 *ih2;
 131         struct octeon_instr_irh *irh;
 132         union octnic_packet_params packet_params;
 133         int port;
 134
 135         memset(cmd, 0, sizeof(union octeon_instr_64B));
 136
 137         ih2 = (struct octeon_instr_ih2 *)&cmd->cmd2.ih2;
 138
 139         /* assume that rflag is cleared so therefore front data will only have
 140          * irh and ossp[0], ossp[1] for a total of 32 bytes
 141          */
 142         ih2->fsz = LIO_PCICMD_O2;
 143
 144         ih2->tagtype = ORDERED_TAG;
 145         ih2->grp = DEFAULT_POW_GRP;
 146
 147         port = (int)oct->instr_queue[setup->s.iq_no]->txpciq.s.port;
 148
 149         if (tag)
 150                 ih2->tag = tag;
 151         else
 152                 ih2->tag = LIO_DATA(port);
 153
 154         ih2->raw = 1;
 155         ih2->qos = (port & 3) + 4;      /* map qos based on interface */
 156
 157         if (!setup->s.gather) {
 158                 ih2->dlengsz = setup->s.u.datasize;
 159         } else {
 160                 ih2->gather = 1;
 161                 ih2->dlengsz = setup->s.u.gatherptrs;
 162         }
 163
 164         irh = (struct octeon_instr_irh *)&cmd->cmd2.irh;
 165
 166         irh->opcode = OPCODE_NIC;
 167         irh->subcode = OPCODE_NIC_NW_DATA;
 168
 169         packet_params.u32 = 0;
 170
 171         packet_params.s.ip_csum = setup->s.ip_csum;
 172         packet_params.s.transport_csum = setup->s.transport_csum;
 173         packet_params.s.tnl_csum = setup->s.tnl_csum;
 174         packet_params.s.tsflag = setup->s.timestamp;
 175
 176         irh->ossp = packet_params.u32;
 177 }
 178
 179 static inline void
 180 octnet_prepare_pci_cmd_o3(struct octeon_device *oct,
 181                           union octeon_instr_64B *cmd,
 182                           union octnic_cmd_setup *setup, u32 tag)
 183 {
 184         struct octeon_instr_irh *irh;
 185         struct octeon_instr_ih3     *ih3;
 186         struct octeon_instr_pki_ih3 *pki_ih3;
 187         union octnic_packet_params packet_params;
 188         int port;
 189
 190         memset(cmd, 0, sizeof(union octeon_instr_64B));
 191
 192         ih3 = (struct octeon_instr_ih3 *)&cmd->cmd3.ih3;
 193         pki_ih3 = (struct octeon_instr_pki_ih3 *)&cmd->cmd3.pki_ih3;
 194
 195         /* assume that rflag is cleared so therefore front data will only have
 196          * irh and ossp[1] and ossp[2] for a total of 24 bytes
 197          */
 198         ih3->pkind       = oct->instr_queue[setup->s.iq_no]->txpciq.s.pkind;
 199         /*PKI IH*/
 200         ih3->fsz = LIO_PCICMD_O3;
 201
 202         if (!setup->s.gather) {
 203                 ih3->dlengsz = setup->s.u.datasize;
 204         } else {
 205                 ih3->gather = 1;
 206                 ih3->dlengsz = setup->s.u.gatherptrs;
 207         }
 208
 209         pki_ih3->w       = 1;
 210         pki_ih3->raw     = 1;
 211         pki_ih3->utag    = 1;
 212         pki_ih3->utt     = 1;
 213         pki_ih3->uqpg    = oct->instr_queue[setup->s.iq_no]->txpciq.s.use_qpg;
 214
 215         port = (int)oct->instr_queue[setup->s.iq_no]->txpciq.s.port;
 216
 217         if (tag)
 218                 pki_ih3->tag = tag;
 219         else
 220                 pki_ih3->tag     = LIO_DATA(port);
 221
 222         pki_ih3->tagtype = ORDERED_TAG;
 223         pki_ih3->qpg     = oct->instr_queue[setup->s.iq_no]->txpciq.s.qpg;
 224         pki_ih3->pm      = 0x7; /*0x7 - meant for Parse nothing, uninterpreted*/
 225         pki_ih3->sl      = 8;   /* sl will be sizeof(pki_ih3)*/
 226
 227         irh = (struct octeon_instr_irh *)&cmd->cmd3.irh;
 228
 229         irh->opcode = OPCODE_NIC;
 230         irh->subcode = OPCODE_NIC_NW_DATA;
 231
 232         packet_params.u32 = 0;
 233
 234         packet_params.s.ip_csum = setup->s.ip_csum;
 235         packet_params.s.transport_csum = setup->s.transport_csum;
 236         packet_params.s.tnl_csum = setup->s.tnl_csum;
 237         packet_params.s.tsflag = setup->s.timestamp;
 238
 239         irh->ossp = packet_params.u32;
 240 }
 241
 242 /** Utility function to prepare a 64B NIC instruction based on a setup command
 243  * @param cmd - pointer to instruction to be filled in.
 244  * @param setup - pointer to the setup structure
 245  * @param q_no - which queue for back pressure
 246  *
 247  * Assumes the cmd instruction is pre-allocated, but no fields are filled in.
 248  */
 249 static inline void
 250 octnet_prepare_pci_cmd(struct octeon_device *oct, union octeon_instr_64B *cmd,
 251                        union octnic_cmd_setup *setup, u32 tag)
 252 {
 253         if (OCTEON_CN6XXX(oct))
 254                 octnet_prepare_pci_cmd_o2(oct, cmd, setup, tag);
 255         else
 256                 octnet_prepare_pci_cmd_o3(oct, cmd, setup, tag);
 257 }
 258
 259 /** Allocate and a soft command with space for a response immediately following
 260  * the commnad.
 261  * @param oct - octeon device pointer
 262  * @param cmd - pointer to the command structure, pre-filled for everything
 263  * except the response.
 264  * @param rdatasize - size in bytes of the response.
 265  *
 266  * @returns pointer to allocated buffer with command copied into it, and
 267  * response space immediately following.
 268  */
 269 void *
 270 octeon_alloc_soft_command_resp(struct octeon_device    *oct,
 271                                union octeon_instr_64B *cmd,
 272                                u32                     rdatasize);
 273
 274 /** Send a NIC data packet to the device
 275  * @param oct - octeon device pointer
 276  * @param ndata - control structure with queueing, and buffer information
 277  *
 278  * @returns IQ_FAILED if it failed to add to the input queue. IQ_STOP if it the
 279  * queue should be stopped, and IQ_SEND_OK if it sent okay.
 280  */
 281 int octnet_send_nic_data_pkt(struct octeon_device *oct,
 282                              struct octnic_data_pkt *ndata,
 283                              int xmit_more);
 284
 285 /** Send a NIC control packet to the device
 286  * @param oct - octeon device pointer
 287  * @param nctrl - control structure with command, timout, and callback info
 288  * @returns IQ_FAILED if it failed to add to the input queue. IQ_STOP if it the
 289  * queue should be stopped, and IQ_SEND_OK if it sent okay.
 290  */
 291 int
 292 octnet_send_nic_ctrl_pkt(struct octeon_device *oct,
 293                          struct octnic_ctrl_pkt *nctrl);
 294
 295 #endif