drivers/scsi/qedf/drv_scsi_fw_funcs.c

Source file repositories/reference/linux-study-clean/drivers/scsi/qedf/drv_scsi_fw_funcs.c

File Facts

System
Linux kernel
Corpus path
drivers/scsi/qedf/drv_scsi_fw_funcs.c
Extension
.c
Size
1472 bytes
Lines
42
Domain
Driver Families
Bucket
drivers/scsi
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
/* QLogic FCoE Offload Driver
 * Copyright (c) 2016-2018 Cavium Inc.
 */
#include "drv_scsi_fw_funcs.h"

#define SCSI_NUM_SGES_IN_CACHE 0x4

bool scsi_is_slow_sgl(u16 num_sges, bool small_mid_sge)
{
	return (num_sges > SCSI_NUM_SGES_SLOW_SGL_THR && small_mid_sge);
}

void init_scsi_sgl_context(struct scsi_sgl_params *ctx_sgl_params,
			   struct scsi_cached_sges *ctx_data_desc,
			   struct scsi_sgl_task_params *sgl_task_params)
{
	/* no need to check for sgl_task_params->sgl validity */
	u8 num_sges_to_init = sgl_task_params->num_sges >
			      SCSI_NUM_SGES_IN_CACHE ? SCSI_NUM_SGES_IN_CACHE :
			      sgl_task_params->num_sges;
	u8 sge_index;
	u32 val;

	val = cpu_to_le32(sgl_task_params->sgl_phys_addr.lo);
	ctx_sgl_params->sgl_addr.lo = val;
	val = cpu_to_le32(sgl_task_params->sgl_phys_addr.hi);
	ctx_sgl_params->sgl_addr.hi = val;
	val = cpu_to_le32(sgl_task_params->total_buffer_size);
	ctx_sgl_params->sgl_total_length = val;
	ctx_sgl_params->sgl_num_sges = cpu_to_le16(sgl_task_params->num_sges);

	for (sge_index = 0; sge_index < num_sges_to_init; sge_index++) {
		val = cpu_to_le32(sgl_task_params->sgl[sge_index].sge_addr.lo);
		ctx_data_desc->sge[sge_index].sge_addr.lo = val;
		val = cpu_to_le32(sgl_task_params->sgl[sge_index].sge_addr.hi);
		ctx_data_desc->sge[sge_index].sge_addr.hi = val;
		val = cpu_to_le32(sgl_task_params->sgl[sge_index].sge_len);
		ctx_data_desc->sge[sge_index].sge_len = val;
	}
}

Annotation

Implementation Notes