drivers/net/ethernet/mellanox/mlx4/fw.c

Source file repositories/reference/linux-study-clean/drivers/net/ethernet/mellanox/mlx4/fw.c

File Facts

System
Linux kernel
Corpus path
drivers/net/ethernet/mellanox/mlx4/fw.c
Extension
.c
Size
102970 bytes
Lines
3112
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: exported/initcall integration point
Status
integration 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

struct mlx4_config_dev {
	__be32	update_flags;
	__be32	rsvd1[3];
	__be16	vxlan_udp_dport;
	__be16	rsvd2;
	__be16  roce_v2_entropy;
	__be16  roce_v2_udp_dport;
	__be32	roce_flags;
	__be32	rsvd4[25];
	__be16	rsvd5;
	u8	rsvd6;
	u8	rx_checksum_val;
};

#define MLX4_VXLAN_UDP_DPORT (1 << 0)
#define MLX4_ROCE_V2_UDP_DPORT BIT(3)
#define MLX4_DISABLE_RX_PORT BIT(18)

static int mlx4_CONFIG_DEV_set(struct mlx4_dev *dev, struct mlx4_config_dev *config_dev)
{
	int err;
	struct mlx4_cmd_mailbox *mailbox;

	mailbox = mlx4_alloc_cmd_mailbox(dev);
	if (IS_ERR(mailbox))
		return PTR_ERR(mailbox);

	memcpy(mailbox->buf, config_dev, sizeof(*config_dev));

	err = mlx4_cmd(dev, mailbox->dma, 0, 0, MLX4_CMD_CONFIG_DEV,
		       MLX4_CMD_TIME_CLASS_B, MLX4_CMD_NATIVE);

	mlx4_free_cmd_mailbox(dev, mailbox);
	return err;
}

static int mlx4_CONFIG_DEV_get(struct mlx4_dev *dev, struct mlx4_config_dev *config_dev)
{
	int err;
	struct mlx4_cmd_mailbox *mailbox;

	mailbox = mlx4_alloc_cmd_mailbox(dev);
	if (IS_ERR(mailbox))
		return PTR_ERR(mailbox);

	err = mlx4_cmd_box(dev, 0, mailbox->dma, 0, 1, MLX4_CMD_CONFIG_DEV,
			   MLX4_CMD_TIME_CLASS_A, MLX4_CMD_NATIVE);

	if (!err)
		memcpy(config_dev, mailbox->buf, sizeof(*config_dev));

	mlx4_free_cmd_mailbox(dev, mailbox);
	return err;
}

/* Conversion between the HW values and the actual functionality.
 * The value represented by the array index,
 * and the functionality determined by the flags.
 */
static const u8 config_dev_csum_flags[] = {
	[0] =	0,
	[1] =	MLX4_RX_CSUM_MODE_VAL_NON_TCP_UDP,
	[2] =	MLX4_RX_CSUM_MODE_VAL_NON_TCP_UDP	|
		MLX4_RX_CSUM_MODE_L4,
	[3] =	MLX4_RX_CSUM_MODE_L4			|
		MLX4_RX_CSUM_MODE_IP_OK_IP_NON_TCP_UDP	|
		MLX4_RX_CSUM_MODE_MULTI_VLAN
};

int mlx4_config_dev_retrieval(struct mlx4_dev *dev,
			      struct mlx4_config_dev_params *params)
{
	struct mlx4_config_dev config_dev = {0};
	int err;
	u8 csum_mask;

#define CONFIG_DEV_RX_CSUM_MODE_MASK			0x7
#define CONFIG_DEV_RX_CSUM_MODE_PORT1_BIT_OFFSET	0
#define CONFIG_DEV_RX_CSUM_MODE_PORT2_BIT_OFFSET	4

	if (!(dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_CONFIG_DEV))
		return -EOPNOTSUPP;

	err = mlx4_CONFIG_DEV_get(dev, &config_dev);
	if (err)
		return err;

	csum_mask = (config_dev.rx_checksum_val >> CONFIG_DEV_RX_CSUM_MODE_PORT1_BIT_OFFSET) &
			CONFIG_DEV_RX_CSUM_MODE_MASK;

Annotation

Implementation Notes