drivers/net/ethernet/huawei/hinic/hinic_common.c

Source file repositories/reference/linux-study-clean/drivers/net/ethernet/huawei/hinic/hinic_common.c

File Facts

System
Linux kernel
Corpus path
drivers/net/ethernet/huawei/hinic/hinic_common.c
Extension
.c
Size
1463 bytes
Lines
72
Domain
Driver Families
Bucket
drivers/net
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
/*
 * Huawei HiNIC PCI Express Linux driver
 * Copyright(c) 2017 Huawei Technologies Co., Ltd
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <asm/byteorder.h>

#include "hinic_common.h"

/**
 * hinic_cpu_to_be32 - convert data to big endian 32 bit format
 * @data: the data to convert
 * @len: length of data to convert
 **/
void hinic_cpu_to_be32(void *data, int len)
{
	u32 *mem = data;
	int i;

	len = len / sizeof(u32);

	for (i = 0; i < len; i++) {
		*mem = cpu_to_be32(*mem);
		mem++;
	}
}

/**
 * hinic_be32_to_cpu - convert data from big endian 32 bit format
 * @data: the data to convert
 * @len: length of data to convert
 **/
void hinic_be32_to_cpu(void *data, int len)
{
	u32 *mem = data;
	int i;

	len = len / sizeof(u32);

	for (i = 0; i < len; i++) {
		*mem = be32_to_cpu(*mem);
		mem++;
	}
}

/**
 * hinic_set_sge - set dma area in scatter gather entry
 * @sge: scatter gather entry
 * @addr: dma address
 * @len: length of relevant data in the dma address
 **/
void hinic_set_sge(struct hinic_sge *sge, dma_addr_t addr, int len)
{
	sge->hi_addr = upper_32_bits(addr);
	sge->lo_addr = lower_32_bits(addr);
	sge->len  = len;
}

/**
 * hinic_sge_to_dma - get dma address from scatter gather entry
 * @sge: scatter gather entry
 *
 * Return dma address of sg entry
 **/
dma_addr_t hinic_sge_to_dma(struct hinic_sge *sge)
{
	return (dma_addr_t)((((u64)sge->hi_addr) << 32) | sge->lo_addr);
}

Annotation

Implementation Notes