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

   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 #include <linux/pci.h>
  20 #include <linux/netdevice.h>
  21 #include "liquidio_common.h"
  22 #include "octeon_droq.h"
  23 #include "octeon_iq.h"
  24 #include "response_manager.h"
  25 #include "octeon_device.h"
  26 #include "octeon_main.h"
  27
  28 static void oct_poll_req_completion(struct work_struct *work);
  29
  30 int octeon_setup_response_list(struct octeon_device *oct)
  31 {
  32         int i, ret = 0;
  33         struct cavium_wq *cwq;
  34
  35         for (i = 0; i < MAX_RESPONSE_LISTS; i++) {
  36                 INIT_LIST_HEAD(&oct->response_list[i].head);
  37                 spin_lock_init(&oct->response_list[i].lock);
  38                 atomic_set(&oct->response_list[i].pending_req_count, 0);
  39         }
  40         spin_lock_init(&oct->cmd_resp_wqlock);
  41
  42         oct->dma_comp_wq.wq = alloc_workqueue("dma-comp", WQ_MEM_RECLAIM, 0);
  43         if (!oct->dma_comp_wq.wq) {
  44                 dev_err(&oct->pci_dev->dev, "failed to create wq thread\n");
  45                 return -ENOMEM;
  46         }
  47
  48         cwq = &oct->dma_comp_wq;
  49         INIT_DELAYED_WORK(&cwq->wk.work, oct_poll_req_completion);
  50         cwq->wk.ctxptr = oct;
  51         oct->cmd_resp_state = OCT_DRV_ONLINE;
  52
  53         return ret;
  54 }
  55
  56 void octeon_delete_response_list(struct octeon_device *oct)
  57 {
  58         cancel_delayed_work_sync(&oct->dma_comp_wq.wk.work);
  59         destroy_workqueue(oct->dma_comp_wq.wq);
  60 }
  61
  62 int lio_process_ordered_list(struct octeon_device *octeon_dev,
  63                              u32 force_quit)
  64 {
  65         struct octeon_response_list *ordered_sc_list;
  66         struct octeon_soft_command *sc;
  67         int request_complete = 0;
  68         int resp_to_process = MAX_ORD_REQS_TO_PROCESS;
  69         u32 status;
  70         u64 status64;
  71
  72         octeon_free_sc_done_list(octeon_dev);
  73
  74         ordered_sc_list = &octeon_dev->response_list[OCTEON_ORDERED_SC_LIST];
  75
  76         do {
  77                 spin_lock_bh(&ordered_sc_list->lock);
  78
  79                 if (list_empty(&ordered_sc_list->head)) {
  80                         spin_unlock_bh(&ordered_sc_list->lock);
  81                         return 1;
  82                 }
  83
  84                 sc = list_first_entry(&ordered_sc_list->head,
  85                                       struct octeon_soft_command, node);
  86
  87                 status = OCTEON_REQUEST_PENDING;
  88
  89                 /* check if octeon has finished DMA'ing a response
  90                  * to where rptr is pointing to
  91                  */
  92                 status64 = *sc->status_word;
  93
  94                 if (status64 != COMPLETION_WORD_INIT) {
  95                         /* This logic ensures that all 64b have been written.
  96                          * 1. check byte 0 for non-FF
  97                          * 2. if non-FF, then swap result from BE to host order
  98                          * 3. check byte 7 (swapped to 0) for non-FF
  99                          * 4. if non-FF, use the low 32-bit status code
 100                          * 5. if either byte 0 or byte 7 is FF, don't use status
 101                          */
 102                         if ((status64 & 0xff) != 0xff) {
 103                                 octeon_swap_8B_data(&status64, 1);
 104                                 if (((status64 & 0xff) != 0xff)) {
 105                                         /* retrieve 16-bit firmware status */
 106                                         status = (u32)(status64 & 0xffffULL);
 107                                         if (status) {
 108                                                 status =
 109                                                   FIRMWARE_STATUS_CODE(status);
 110                                         } else {
 111                                                 /* i.e. no error */
 112                                                 status = OCTEON_REQUEST_DONE;
 113                                         }
 114                                 }
 115                         }
 116                 } else if (unlikely(force_quit) || (sc->expiry_time &&
 117                         time_after(jiffies, (unsigned long)sc->expiry_time))) {
 118                         struct octeon_instr_irh *irh =
 119                                 (struct octeon_instr_irh *)&sc->cmd.cmd3.irh;
 120
 121                         dev_err(&octeon_dev->pci_dev->dev, "%s: ", __func__);
 122                         dev_err(&octeon_dev->pci_dev->dev,
 123                                 "cmd %x/%x/%llx/%llx failed, ",
 124                                 irh->opcode, irh->subcode,
 125                                 sc->cmd.cmd3.ossp[0], sc->cmd.cmd3.ossp[1]);
 126                         dev_err(&octeon_dev->pci_dev->dev,
 127                                 "timeout (%ld, %ld)\n",
 128                                 (long)jiffies, (long)sc->expiry_time);
 129                         status = OCTEON_REQUEST_TIMEOUT;
 130                 }
 131
 132                 if (status != OCTEON_REQUEST_PENDING) {
 133                         sc->sc_status = status;
 134
 135                         /* we have received a response or we have timed out */
 136                         /* remove node from linked list */
 137                         list_del(&sc->node);
 138                         atomic_dec(&octeon_dev->response_list
 139                                    [OCTEON_ORDERED_SC_LIST].
 140                                    pending_req_count);
 141
 142                         if (!sc->callback) {
 143                                 atomic_inc(&octeon_dev->response_list
 144                                            [OCTEON_DONE_SC_LIST].
 145                                            pending_req_count);
 146                                 list_add_tail(&sc->node,
 147                                               &octeon_dev->response_list
 148                                               [OCTEON_DONE_SC_LIST].head);
 149
 150                                 if (unlikely(READ_ONCE(sc->caller_is_done))) {
 151                                         /* caller does not wait for response
 152                                          * from firmware
 153                                          */
 154                                         if (status != OCTEON_REQUEST_DONE) {
 155                                                 struct octeon_instr_irh *irh;
 156
 157                                                 irh =
 158                                                     (struct octeon_instr_irh *)
 159                                                     &sc->cmd.cmd3.irh;
 160                                                 dev_dbg
 161                                                     (&octeon_dev->pci_dev->dev,
 162                                                     "%s: sc failed: opcode=%x, ",
 163                                                     __func__, irh->opcode);
 164                                                 dev_dbg
 165                                                     (&octeon_dev->pci_dev->dev,
 166                                                     "subcode=%x, ossp[0]=%llx, ",
 167                                                     irh->subcode,
 168                                                     sc->cmd.cmd3.ossp[0]);
 169                                                 dev_dbg
 170                                                     (&octeon_dev->pci_dev->dev,
 171                                                     "ossp[1]=%llx, status=%d\n",
 172                                                     sc->cmd.cmd3.ossp[1],
 173                                                     status);
 174                                         }
 175                                 } else {
 176                                         complete(&sc->complete);
 177                                 }
 178
 179                                 spin_unlock_bh(&ordered_sc_list->lock);
 180                         } else {
 181                                 /* sc with callback function */
 182                                 if (status == OCTEON_REQUEST_TIMEOUT) {
 183                                         atomic_inc(&octeon_dev->response_list
 184                                                    [OCTEON_ZOMBIE_SC_LIST].
 185                                                    pending_req_count);
 186                                         list_add_tail(&sc->node,
 187                                                       &octeon_dev->response_list
 188                                                       [OCTEON_ZOMBIE_SC_LIST].
 189                                                       head);
 190                                 }
 191
 192                                 spin_unlock_bh(&ordered_sc_list->lock);
 193
 194                                 sc->callback(octeon_dev, status,
 195                                              sc->callback_arg);
 196                                 /* sc is freed by caller */
 197                         }
 198
 199                         request_complete++;
 200
 201                 } else {
 202                         /* no response yet */
 203                         request_complete = 0;
 204                         spin_unlock_bh
 205                             (&ordered_sc_list->lock);
 206                 }
 207
 208                 /* If we hit the Max Ordered requests to process every loop,
 209                  * we quit
 210                  * and let this function be invoked the next time the poll
 211                  * thread runs
 212                  * to process the remaining requests. This function can take up
 213                  * the entire CPU if there is no upper limit to the requests
 214                  * processed.
 215                  */
 216                 if (request_complete >= resp_to_process)
 217                         break;
 218         } while (request_complete);
 219
 220         return 0;
 221 }
 222
 223 static void oct_poll_req_completion(struct work_struct *work)
 224 {
 225         struct cavium_wk *wk = (struct cavium_wk *)work;
 226         struct octeon_device *oct = (struct octeon_device *)wk->ctxptr;
 227         struct cavium_wq *cwq = &oct->dma_comp_wq;
 228
 229         lio_process_ordered_list(oct, 0);
 230
 231         if (atomic_read(&oct->response_list
 232                         [OCTEON_ORDERED_SC_LIST].pending_req_count))
 233                 queue_delayed_work(cwq->wq, &cwq->wk.work, msecs_to_jiffies(1));
 234 }