drivers/scsi/qedf/drv_scsi_fw_funcs.c

   1 /* QLogic FCoE Offload Driver
   2  * Copyright (c) 2016-2017 Cavium Inc.
   3  *
   4  * This software is available under the terms of the GNU General Public License
   5  * (GPL) Version 2, available from the file COPYING in the main directory of
   6  * this source tree.
   7  */
   8 #include "drv_scsi_fw_funcs.h"
   9
  10 #define SCSI_NUM_SGES_IN_CACHE 0x4
  11
  12 bool scsi_is_slow_sgl(u16 num_sges, bool small_mid_sge)
  13 {
  14         return (num_sges > SCSI_NUM_SGES_SLOW_SGL_THR && small_mid_sge);
  15 }
  16
  17 void init_scsi_sgl_context(struct scsi_sgl_params *ctx_sgl_params,
  18                            struct scsi_cached_sges *ctx_data_desc,
  19                            struct scsi_sgl_task_params *sgl_task_params)
  20 {
  21         /* no need to check for sgl_task_params->sgl validity */
  22         u8 num_sges_to_init = sgl_task_params->num_sges >
  23                               SCSI_NUM_SGES_IN_CACHE ? SCSI_NUM_SGES_IN_CACHE :
  24                               sgl_task_params->num_sges;
  25         u8 sge_index;
  26         u32 val;
  27
  28         val = cpu_to_le32(sgl_task_params->sgl_phys_addr.lo);
  29         ctx_sgl_params->sgl_addr.lo = val;
  30         val = cpu_to_le32(sgl_task_params->sgl_phys_addr.hi);
  31         ctx_sgl_params->sgl_addr.hi = val;
  32         val = cpu_to_le32(sgl_task_params->total_buffer_size);
  33         ctx_sgl_params->sgl_total_length = val;
  34         ctx_sgl_params->sgl_num_sges = cpu_to_le16(sgl_task_params->num_sges);
  35
  36         for (sge_index = 0; sge_index < num_sges_to_init; sge_index++) {
  37                 val = cpu_to_le32(sgl_task_params->sgl[sge_index].sge_addr.lo);
  38                 ctx_data_desc->sge[sge_index].sge_addr.lo = val;
  39                 val = cpu_to_le32(sgl_task_params->sgl[sge_index].sge_addr.hi);
  40                 ctx_data_desc->sge[sge_index].sge_addr.hi = val;
  41                 val = cpu_to_le32(sgl_task_params->sgl[sge_index].sge_len);
  42                 ctx_data_desc->sge[sge_index].sge_len = val;
  43         }
  44 }