LXR linux/drivers/net/ethernet/qlogic/qed/qed_nvmetcp_fw

   1// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
   2/* Copyright 2021 Marvell. All rights reserved. */
   3
   4#include <linux/kernel.h>
   5#include <linux/module.h>
   6#include <linux/pci.h>
   7#include <linux/list.h>
   8#include <linux/mm.h>
   9#include <linux/types.h>
  10#include <asm/byteorder.h>
  11#include <linux/qed/common_hsi.h>
  12#include <linux/qed/storage_common.h>
  13#include <linux/qed/nvmetcp_common.h>
  14#include <linux/qed/qed_nvmetcp_if.h>
  15#include "qed_nvmetcp_fw_funcs.h"
  16
  17#define NVMETCP_NUM_SGES_IN_CACHE 0x4
  18
  19bool nvmetcp_is_slow_sgl(u16 num_sges, bool small_mid_sge)
  20{
  21        return (num_sges > SCSI_NUM_SGES_SLOW_SGL_THR && small_mid_sge);
  22}
  23
  24void init_scsi_sgl_context(struct scsi_sgl_params *ctx_sgl_params,
  25                           struct scsi_cached_sges *ctx_data_desc,
  26                           struct storage_sgl_task_params *sgl_params)
  27{
  28        u8 num_sges_to_init = (u8)(sgl_params->num_sges > NVMETCP_NUM_SGES_IN_CACHE ?
  29                                   NVMETCP_NUM_SGES_IN_CACHE : sgl_params->num_sges);
  30        u8 sge_index;
  31
  32        /* sgl params */
  33        ctx_sgl_params->sgl_addr.lo = cpu_to_le32(sgl_params->sgl_phys_addr.lo);
  34        ctx_sgl_params->sgl_addr.hi = cpu_to_le32(sgl_params->sgl_phys_addr.hi);
  35        ctx_sgl_params->sgl_total_length = cpu_to_le32(sgl_params->total_buffer_size);
  36        ctx_sgl_params->sgl_num_sges = cpu_to_le16(sgl_params->num_sges);
  37
  38        for (sge_index = 0; sge_index < num_sges_to_init; sge_index++) {
  39                ctx_data_desc->sge[sge_index].sge_addr.lo =
  40                        cpu_to_le32(sgl_params->sgl[sge_index].sge_addr.lo);
  41                ctx_data_desc->sge[sge_index].sge_addr.hi =
  42                        cpu_to_le32(sgl_params->sgl[sge_index].sge_addr.hi);
  43                ctx_data_desc->sge[sge_index].sge_len =
  44                        cpu_to_le32(sgl_params->sgl[sge_index].sge_len);
  45        }
  46}
  47
  48static inline u32 calc_rw_task_size(struct nvmetcp_task_params *task_params,
  49                                    enum nvmetcp_task_type task_type)
  50{
  51        u32 io_size;
  52
  53        if (task_type == NVMETCP_TASK_TYPE_HOST_WRITE)
  54                io_size = task_params->tx_io_size;
  55        else
  56                io_size = task_params->rx_io_size;
  57
  58        if (unlikely(!io_size))
  59                return 0;
  60
  61        return io_size;
  62}
  63
  64static inline void init_sqe(struct nvmetcp_task_params *task_params,
  65                            struct storage_sgl_task_params *sgl_task_params,
  66                            enum nvmetcp_task_type task_type)
  67{
  68        if (!task_params->sqe)
  69                return;
  70
  71        memset(task_params->sqe, 0, sizeof(*task_params->sqe));
  72        task_params->sqe->task_id = cpu_to_le16(task_params->itid);
  73
  74        switch (task_type) {
  75        case NVMETCP_TASK_TYPE_HOST_WRITE: {
  76                u32 buf_size = 0;
  77                u32 num_sges = 0;
  78
  79                SET_FIELD(task_params->sqe->contlen_cdbsize,
  80                          NVMETCP_WQE_CDB_SIZE_OR_NVMETCP_CMD, 1);
  81                SET_FIELD(task_params->sqe->flags, NVMETCP_WQE_WQE_TYPE,
  82                          NVMETCP_WQE_TYPE_NORMAL);
  83                if (task_params->tx_io_size) {
  84                        if (task_params->send_write_incapsule)
  85                                buf_size = calc_rw_task_size(task_params, task_type);
  86
  87                        if (nvmetcp_is_slow_sgl(sgl_task_params->num_sges,
  88                                                sgl_task_params->small_mid_sge))
  89                                num_sges = NVMETCP_WQE_NUM_SGES_SLOWIO;
  90                        else
  91                                num_sges = min((u16)sgl_task_params->num_sges,
  92                                               (u16)SCSI_NUM_SGES_SLOW_SGL_THR);
  93                }
  94                SET_FIELD(task_params->sqe->flags, NVMETCP_WQE_NUM_SGES, num_sges);
  95                SET_FIELD(task_params->sqe->contlen_cdbsize, NVMETCP_WQE_CONT_LEN, buf_size);
  96        } break;
  97
  98        case NVMETCP_TASK_TYPE_HOST_READ: {
  99                SET_FIELD(task_params->sqe->flags, NVMETCP_WQE_WQE_TYPE,
 100                          NVMETCP_WQE_TYPE_NORMAL);
 101                SET_FIELD(task_params->sqe->contlen_cdbsize,
 102                          NVMETCP_WQE_CDB_SIZE_OR_NVMETCP_CMD, 1);
 103        } break;
 104
 105        case NVMETCP_TASK_TYPE_INIT_CONN_REQUEST: {
 106                SET_FIELD(task_params->sqe->flags, NVMETCP_WQE_WQE_TYPE,
 107                          NVMETCP_WQE_TYPE_MIDDLE_PATH);
 108
 109                if (task_params->tx_io_size) {
 110                        SET_FIELD(task_params->sqe->contlen_cdbsize, NVMETCP_WQE_CONT_LEN,
 111                                  task_params->tx_io_size);
 112                        SET_FIELD(task_params->sqe->flags, NVMETCP_WQE_NUM_SGES,
 113                                  min((u16)sgl_task_params->num_sges,
 114                                      (u16)SCSI_NUM_SGES_SLOW_SGL_THR));
 115                }
 116        } break;
 117
 118        case NVMETCP_TASK_TYPE_CLEANUP:
 119                SET_FIELD(task_params->sqe->flags, NVMETCP_WQE_WQE_TYPE,
 120                          NVMETCP_WQE_TYPE_TASK_CLEANUP);
 121
 122        default:
 123                break;
 124        }
 125}
 126
 127/* The following function initializes of NVMeTCP task params */
 128static inline void
 129init_nvmetcp_task_params(struct e5_nvmetcp_task_context *context,
 130                         struct nvmetcp_task_params *task_params,
 131                         enum nvmetcp_task_type task_type)
 132{
 133        context->ystorm_st_context.state.cccid = task_params->host_cccid;
 134        SET_FIELD(context->ustorm_st_context.error_flags, USTORM_NVMETCP_TASK_ST_CTX_NVME_TCP, 1);
 135        context->ustorm_st_context.nvme_tcp_opaque_lo = cpu_to_le32(task_params->opq.lo);
 136        context->ustorm_st_context.nvme_tcp_opaque_hi = cpu_to_le32(task_params->opq.hi);
 137}
 138
 139/* The following function initializes default values to all tasks */
 140static inline void
 141init_default_nvmetcp_task(struct nvmetcp_task_params *task_params,
 142                          void *pdu_header, void *nvme_cmd,
 143                          enum nvmetcp_task_type task_type)
 144{
 145        struct e5_nvmetcp_task_context *context = task_params->context;
 146        const u8 val_byte = context->mstorm_ag_context.cdu_validation;
 147        u8 dw_index;
 148
 149        memset(context, 0, sizeof(*context));
 150        init_nvmetcp_task_params(context, task_params,
 151                                 (enum nvmetcp_task_type)task_type);
 152
 153        /* Swapping requirements used below, will be removed in future FW versions */
 154        if (task_type == NVMETCP_TASK_TYPE_HOST_WRITE ||
 155            task_type == NVMETCP_TASK_TYPE_HOST_READ) {
 156                for (dw_index = 0;
 157                     dw_index < QED_NVMETCP_CMN_HDR_SIZE / sizeof(u32);
 158                     dw_index++)
 159                        context->ystorm_st_context.pdu_hdr.task_hdr.reg[dw_index] =
 160                                cpu_to_le32(__swab32(((u32 *)pdu_header)[dw_index]));
 161
 162                for (dw_index = QED_NVMETCP_CMN_HDR_SIZE / sizeof(u32);
 163                     dw_index < QED_NVMETCP_CMD_HDR_SIZE / sizeof(u32);
 164                     dw_index++)
 165                        context->ystorm_st_context.pdu_hdr.task_hdr.reg[dw_index] =
 166                                cpu_to_le32(__swab32(((u32 *)nvme_cmd)[dw_index - 2]));
 167        } else {
 168                for (dw_index = 0;
 169                     dw_index < QED_NVMETCP_NON_IO_HDR_SIZE / sizeof(u32);
 170                     dw_index++)
 171                        context->ystorm_st_context.pdu_hdr.task_hdr.reg[dw_index] =
 172                                cpu_to_le32(__swab32(((u32 *)pdu_header)[dw_index]));
 173        }
 174
 175        /* M-Storm Context: */
 176        context->mstorm_ag_context.cdu_validation = val_byte;
 177        context->mstorm_st_context.task_type = (u8)(task_type);
 178        context->mstorm_ag_context.task_cid = cpu_to_le16(task_params->conn_icid);
 179
 180        /* Ustorm Context: */
 181        SET_FIELD(context->ustorm_ag_context.flags1, E5_USTORM_NVMETCP_TASK_AG_CTX_R2T2RECV, 1);
 182        context->ustorm_st_context.task_type = (u8)(task_type);
 183        context->ustorm_st_context.cq_rss_number = task_params->cq_rss_number;
 184        context->ustorm_ag_context.icid = cpu_to_le16(task_params->conn_icid);
 185}
 186
 187/* The following function initializes the U-Storm Task Contexts */
 188static inline void
 189init_ustorm_task_contexts(struct ustorm_nvmetcp_task_st_ctx *ustorm_st_context,
 190                          struct e5_ustorm_nvmetcp_task_ag_ctx *ustorm_ag_context,
 191                          u32 remaining_recv_len,
 192                          u32 expected_data_transfer_len, u8 num_sges,
 193                          bool tx_dif_conn_err_en)
 194{
 195        /* Remaining data to be received in bytes. Used in validations*/
 196        ustorm_st_context->rem_rcv_len = cpu_to_le32(remaining_recv_len);
 197        ustorm_ag_context->exp_data_acked = cpu_to_le32(expected_data_transfer_len);
 198        ustorm_st_context->exp_data_transfer_len = cpu_to_le32(expected_data_transfer_len);
 199        SET_FIELD(ustorm_st_context->reg1_map, REG1_NUM_SGES, num_sges);
 200        SET_FIELD(ustorm_ag_context->flags2, E5_USTORM_NVMETCP_TASK_AG_CTX_DIF_ERROR_CF_EN,
 201                  tx_dif_conn_err_en ? 1 : 0);
 202}
 203
 204/* The following function initializes Local Completion Contexts: */
 205static inline void
 206set_local_completion_context(struct e5_nvmetcp_task_context *context)
 207{
 208        SET_FIELD(context->ystorm_st_context.state.flags,
 209                  YSTORM_NVMETCP_TASK_STATE_LOCAL_COMP, 1);
 210        SET_FIELD(context->ustorm_st_context.flags,
 211                  USTORM_NVMETCP_TASK_ST_CTX_LOCAL_COMP, 1);
 212}
 213
 214/* Common Fastpath task init function: */
 215static inline void
 216init_rw_nvmetcp_task(struct nvmetcp_task_params *task_params,
 217                     enum nvmetcp_task_type task_type,
 218                     void *pdu_header, void *nvme_cmd,
 219                     struct storage_sgl_task_params *sgl_task_params)
 220{
 221        struct e5_nvmetcp_task_context *context = task_params->context;
 222        u32 task_size = calc_rw_task_size(task_params, task_type);
 223        bool slow_io = false;
 224        u8 num_sges = 0;
 225
 226        init_default_nvmetcp_task(task_params, pdu_header, nvme_cmd, task_type);
 227
 228        /* Tx/Rx: */
 229        if (task_params->tx_io_size) {
 230                /* if data to transmit: */
 231                init_scsi_sgl_context(&context->ystorm_st_context.state.sgl_params,
 232                                      &context->ystorm_st_context.state.data_desc,
 233                                      sgl_task_params);
 234                slow_io = nvmetcp_is_slow_sgl(sgl_task_params->num_sges,
 235                                              sgl_task_params->small_mid_sge);
 236                num_sges =
 237                        (u8)(!slow_io ? min((u32)sgl_task_params->num_sges,
 238                                            (u32)SCSI_NUM_SGES_SLOW_SGL_THR) :
 239                                            NVMETCP_WQE_NUM_SGES_SLOWIO);
 240                if (slow_io) {
 241                        SET_FIELD(context->ystorm_st_context.state.flags,
 242                                  YSTORM_NVMETCP_TASK_STATE_SLOW_IO, 1);
 243                }
 244        } else if (task_params->rx_io_size) {
 245                /* if data to receive: */
 246                init_scsi_sgl_context(&context->mstorm_st_context.sgl_params,
 247                                      &context->mstorm_st_context.data_desc,
 248                                      sgl_task_params);
 249                num_sges =
 250                        (u8)(!nvmetcp_is_slow_sgl(sgl_task_params->num_sges,
 251                                                  sgl_task_params->small_mid_sge) ?
 252                                                  min((u32)sgl_task_params->num_sges,
 253                                                      (u32)SCSI_NUM_SGES_SLOW_SGL_THR) :
 254                                                      NVMETCP_WQE_NUM_SGES_SLOWIO);
 255                context->mstorm_st_context.rem_task_size = cpu_to_le32(task_size);
 256        }
 257
 258        /* Ustorm context: */
 259        init_ustorm_task_contexts(&context->ustorm_st_context,
 260                                  &context->ustorm_ag_context,
 261                                  /* Remaining Receive length is the Task Size */
 262                                  task_size,
 263                                  /* The size of the transmitted task */
 264                                  task_size,
 265                                  /* num_sges */
 266                                  num_sges,
 267                                  false);
 268
 269        /* Set exp_data_acked */
 270        if (task_type == NVMETCP_TASK_TYPE_HOST_WRITE) {
 271                if (task_params->send_write_incapsule)
 272                        context->ustorm_ag_context.exp_data_acked = task_size;
 273                else
 274                        context->ustorm_ag_context.exp_data_acked = 0;
 275        } else if (task_type == NVMETCP_TASK_TYPE_HOST_READ) {
 276                context->ustorm_ag_context.exp_data_acked = 0;
 277        }
 278
 279        context->ustorm_ag_context.exp_cont_len = 0;
 280        init_sqe(task_params, sgl_task_params, task_type);
 281}
 282
 283static void
 284init_common_initiator_read_task(struct nvmetcp_task_params *task_params,
 285                                struct nvme_tcp_cmd_pdu *cmd_pdu_header,
 286                                struct nvme_command *nvme_cmd,
 287                                struct storage_sgl_task_params *sgl_task_params)
 288{
 289        init_rw_nvmetcp_task(task_params, NVMETCP_TASK_TYPE_HOST_READ,
 290                             cmd_pdu_header, nvme_cmd, sgl_task_params);
 291}
 292
 293void init_nvmetcp_host_read_task(struct nvmetcp_task_params *task_params,
 294                                 struct nvme_tcp_cmd_pdu *cmd_pdu_header,
 295                                 struct nvme_command *nvme_cmd,
 296                                 struct storage_sgl_task_params *sgl_task_params)
 297{
 298        init_common_initiator_read_task(task_params, (void *)cmd_pdu_header,
 299                                        (void *)nvme_cmd, sgl_task_params);
 300}
 301
 302static void
 303init_common_initiator_write_task(struct nvmetcp_task_params *task_params,
 304                                 struct nvme_tcp_cmd_pdu *cmd_pdu_header,
 305                                 struct nvme_command *nvme_cmd,
 306                                 struct storage_sgl_task_params *sgl_task_params)
 307{
 308        init_rw_nvmetcp_task(task_params, NVMETCP_TASK_TYPE_HOST_WRITE,
 309                             cmd_pdu_header, nvme_cmd, sgl_task_params);
 310}
 311
 312void init_nvmetcp_host_write_task(struct nvmetcp_task_params *task_params,
 313                                  struct nvme_tcp_cmd_pdu *cmd_pdu_header,
 314                                  struct nvme_command *nvme_cmd,
 315                                  struct storage_sgl_task_params *sgl_task_params)
 316{
 317        init_common_initiator_write_task(task_params, (void *)cmd_pdu_header,
 318                                         (void *)nvme_cmd, sgl_task_params);
 319}
 320
 321static void
 322init_common_login_request_task(struct nvmetcp_task_params *task_params,
 323                               void *login_req_pdu_header,
 324                               struct storage_sgl_task_params *tx_sgl_task_params,
 325                               struct storage_sgl_task_params *rx_sgl_task_params)
 326{
 327        struct e5_nvmetcp_task_context *context = task_params->context;
 328
 329        init_default_nvmetcp_task(task_params, (void *)login_req_pdu_header, NULL,
 330                                  NVMETCP_TASK_TYPE_INIT_CONN_REQUEST);
 331
 332        /* Ustorm Context: */
 333        init_ustorm_task_contexts(&context->ustorm_st_context,
 334                                  &context->ustorm_ag_context,
 335
 336                                  /* Remaining Receive length is the Task Size */
 337                                  task_params->rx_io_size ?
 338                                  rx_sgl_task_params->total_buffer_size : 0,
 339
 340                                  /* The size of the transmitted task */
 341                                  task_params->tx_io_size ?
 342                                  tx_sgl_task_params->total_buffer_size : 0,
 343                                  0, /* num_sges */
 344                                  0); /* tx_dif_conn_err_en */
 345
 346        /* SGL context: */
 347        if (task_params->tx_io_size)
 348                init_scsi_sgl_context(&context->ystorm_st_context.state.sgl_params,
 349                                      &context->ystorm_st_context.state.data_desc,
 350                                      tx_sgl_task_params);
 351        if (task_params->rx_io_size)
 352                init_scsi_sgl_context(&context->mstorm_st_context.sgl_params,
 353                                      &context->mstorm_st_context.data_desc,
 354                                      rx_sgl_task_params);
 355
 356        context->mstorm_st_context.rem_task_size =
 357                cpu_to_le32(task_params->rx_io_size ?
 358                                 rx_sgl_task_params->total_buffer_size : 0);
 359        init_sqe(task_params, tx_sgl_task_params, NVMETCP_TASK_TYPE_INIT_CONN_REQUEST);
 360}
 361
 362/* The following function initializes Login task in Host mode: */
 363void init_nvmetcp_init_conn_req_task(struct nvmetcp_task_params *task_params,
 364                                     struct nvme_tcp_icreq_pdu *init_conn_req_pdu_hdr,
 365                                     struct storage_sgl_task_params *tx_sgl_task_params,
 366                                     struct storage_sgl_task_params *rx_sgl_task_params)
 367{
 368        init_common_login_request_task(task_params, init_conn_req_pdu_hdr,
 369                                       tx_sgl_task_params, rx_sgl_task_params);
 370}
 371
 372void init_cleanup_task_nvmetcp(struct nvmetcp_task_params *task_params)
 373{
 374        init_sqe(task_params, NULL, NVMETCP_TASK_TYPE_CLEANUP);
 375}
 376