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

   1 /**********************************************************************
   2  * Author: Cavium, Inc.
   3  *
   4  * Contact: support@cavium.com
   5  *          Please include "LiquidIO" in the subject.
   6  *
   7  * Copyright (c) 2003-2015 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  * This file may also be available under a different license from Cavium.
  20  * Contact Cavium, Inc. for more information
  21  **********************************************************************/
  22 #include <linux/pci.h>
  23 #include <linux/netdevice.h>
  24 #include "liquidio_common.h"
  25 #include "octeon_droq.h"
  26 #include "octeon_iq.h"
  27 #include "response_manager.h"
  28 #include "octeon_device.h"
  29 #include "octeon_nic.h"
  30 #include "octeon_main.h"
  31
  32 void *
  33 octeon_alloc_soft_command_resp(struct octeon_device    *oct,
  34                                union octeon_instr_64B *cmd,
  35                                u32                     rdatasize)
  36 {
  37         struct octeon_soft_command *sc;
  38         struct octeon_instr_ih3  *ih3;
  39         struct octeon_instr_ih2  *ih2;
  40         struct octeon_instr_irh *irh;
  41         struct octeon_instr_rdp *rdp;
  42
  43         sc = (struct octeon_soft_command *)
  44                 octeon_alloc_soft_command(oct, 0, rdatasize, 0);
  45
  46         if (!sc)
  47                 return NULL;
  48
  49         /* Copy existing command structure into the soft command */
  50         memcpy(&sc->cmd, cmd, sizeof(union octeon_instr_64B));
  51
  52         /* Add in the response related fields. Opcode and Param are already
  53          * there.
  54          */
  55         if (OCTEON_CN23XX_PF(oct)) {
  56                 ih3      = (struct octeon_instr_ih3 *)&sc->cmd.cmd3.ih3;
  57                 rdp     = (struct octeon_instr_rdp *)&sc->cmd.cmd3.rdp;
  58                 irh     = (struct octeon_instr_irh *)&sc->cmd.cmd3.irh;
  59                 /*pkiih3 + irh + ossp[0] + ossp[1] + rdp + rptr = 40 bytes */
  60                 ih3->fsz = LIO_SOFTCMDRESP_IH3;
  61         } else {
  62                 ih2      = (struct octeon_instr_ih2 *)&sc->cmd.cmd2.ih2;
  63                 rdp     = (struct octeon_instr_rdp *)&sc->cmd.cmd2.rdp;
  64                 irh     = (struct octeon_instr_irh *)&sc->cmd.cmd2.irh;
  65                 /* irh + ossp[0] + ossp[1] + rdp + rptr = 40 bytes */
  66                 ih2->fsz = LIO_SOFTCMDRESP_IH2;
  67         }
  68
  69         irh->rflag = 1; /* a response is required */
  70
  71         rdp->pcie_port = oct->pcie_port;
  72         rdp->rlen      = rdatasize;
  73
  74         *sc->status_word = COMPLETION_WORD_INIT;
  75
  76         if (OCTEON_CN23XX_PF(oct))
  77                 sc->cmd.cmd3.rptr =  sc->dmarptr;
  78         else
  79                 sc->cmd.cmd2.rptr =  sc->dmarptr;
  80
  81         sc->wait_time = 1000;
  82         sc->timeout = jiffies + sc->wait_time;
  83
  84         return sc;
  85 }
  86
  87 int octnet_send_nic_data_pkt(struct octeon_device *oct,
  88                              struct octnic_data_pkt *ndata)
  89 {
  90         int ring_doorbell = 1;
  91
  92         return octeon_send_command(oct, ndata->q_no, ring_doorbell, &ndata->cmd,
  93                                    ndata->buf, ndata->datasize,
  94                                    ndata->reqtype);
  95 }
  96
  97 static void octnet_link_ctrl_callback(struct octeon_device *oct,
  98                                       u32 status,
  99                                       void *sc_ptr)
 100 {
 101         struct octeon_soft_command *sc = (struct octeon_soft_command *)sc_ptr;
 102         struct octnic_ctrl_pkt *nctrl;
 103
 104         nctrl = (struct octnic_ctrl_pkt *)sc->ctxptr;
 105
 106         /* Call the callback function if status is OK.
 107          * Status is OK only if a response was expected and core returned
 108          * success.
 109          * If no response was expected, status is OK if the command was posted
 110          * successfully.
 111          */
 112         if (!status && nctrl->cb_fn)
 113                 nctrl->cb_fn(nctrl);
 114
 115         octeon_free_soft_command(oct, sc);
 116 }
 117
 118 static inline struct octeon_soft_command
 119 *octnic_alloc_ctrl_pkt_sc(struct octeon_device *oct,
 120                           struct octnic_ctrl_pkt *nctrl)
 121 {
 122         struct octeon_soft_command *sc = NULL;
 123         u8 *data;
 124         u32 rdatasize;
 125         u32 uddsize = 0, datasize = 0;
 126
 127         uddsize = (u32)(nctrl->ncmd.s.more * 8);
 128
 129         datasize = OCTNET_CMD_SIZE + uddsize;
 130         rdatasize = (nctrl->wait_time) ? 16 : 0;
 131
 132         sc = (struct octeon_soft_command *)
 133                 octeon_alloc_soft_command(oct, datasize, rdatasize,
 134                                           sizeof(struct octnic_ctrl_pkt));
 135
 136         if (!sc)
 137                 return NULL;
 138
 139         memcpy(sc->ctxptr, nctrl, sizeof(struct octnic_ctrl_pkt));
 140
 141         data = (u8 *)sc->virtdptr;
 142
 143         memcpy(data, &nctrl->ncmd, OCTNET_CMD_SIZE);
 144
 145         octeon_swap_8B_data((u64 *)data, (OCTNET_CMD_SIZE >> 3));
 146
 147         if (uddsize) {
 148                 /* Endian-Swap for UDD should have been done by caller. */
 149                 memcpy(data + OCTNET_CMD_SIZE, nctrl->udd, uddsize);
 150         }
 151
 152         sc->iq_no = (u32)nctrl->iq_no;
 153
 154         octeon_prepare_soft_command(oct, sc, OPCODE_NIC, OPCODE_NIC_CMD,
 155                                     0, 0, 0);
 156
 157         sc->callback = octnet_link_ctrl_callback;
 158         sc->callback_arg = sc;
 159         sc->wait_time = nctrl->wait_time;
 160
 161         return sc;
 162 }
 163
 164 int
 165 octnet_send_nic_ctrl_pkt(struct octeon_device *oct,
 166                          struct octnic_ctrl_pkt *nctrl)
 167 {
 168         int retval;
 169         struct octeon_soft_command *sc = NULL;
 170
 171         spin_lock_bh(&oct->cmd_resp_wqlock);
 172         /* Allow only rx ctrl command to stop traffic on the chip
 173          * during offline operations
 174          */
 175         if ((oct->cmd_resp_state == OCT_DRV_OFFLINE) &&
 176             (nctrl->ncmd.s.cmd != OCTNET_CMD_RX_CTL)) {
 177                 spin_unlock_bh(&oct->cmd_resp_wqlock);
 178                 dev_err(&oct->pci_dev->dev,
 179                         "%s cmd:%d not processed since driver offline\n",
 180                         __func__, nctrl->ncmd.s.cmd);
 181                 return -1;
 182         }
 183
 184         sc = octnic_alloc_ctrl_pkt_sc(oct, nctrl);
 185         if (!sc) {
 186                 dev_err(&oct->pci_dev->dev, "%s soft command alloc failed\n",
 187                         __func__);
 188                 spin_unlock_bh(&oct->cmd_resp_wqlock);
 189                 return -1;
 190         }
 191
 192         retval = octeon_send_soft_command(oct, sc);
 193         if (retval == IQ_SEND_FAILED) {
 194                 octeon_free_soft_command(oct, sc);
 195                 dev_err(&oct->pci_dev->dev, "%s pf_num:%d soft command:%d send failed status: %x\n",
 196                         __func__, oct->pf_num, nctrl->ncmd.s.cmd, retval);
 197                 spin_unlock_bh(&oct->cmd_resp_wqlock);
 198                 return -1;
 199         }
 200
 201         spin_unlock_bh(&oct->cmd_resp_wqlock);
 202         return retval;
 203 }