drivers/infiniband/ulp/isert/ib_isert.h

Source file repositories/reference/linux-study-clean/drivers/infiniband/ulp/isert/ib_isert.h

File Facts

System
Linux kernel
Corpus path
drivers/infiniband/ulp/isert/ib_isert.h
Extension
.h
Size
5066 bytes
Lines
213
Domain
Driver Families
Bucket
drivers/infiniband
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

struct iser_rx_desc {
	char		buf[ISER_RX_SIZE];
	u64		dma_addr;
	struct ib_sge	rx_sg;
	struct ib_cqe	rx_cqe;
	bool		in_use;
};

static inline struct iser_rx_desc *cqe_to_rx_desc(struct ib_cqe *cqe)
{
	return container_of(cqe, struct iser_rx_desc, rx_cqe);
}

static void *isert_get_iser_hdr(struct iser_rx_desc *desc)
{
	return PTR_ALIGN(desc->buf + ISER_HEADERS_LEN, 512) - ISER_HEADERS_LEN;
}

static size_t isert_get_hdr_offset(struct iser_rx_desc *desc)
{
	return isert_get_iser_hdr(desc) - (void *)desc->buf;
}

static void *isert_get_iscsi_hdr(struct iser_rx_desc *desc)
{
	return isert_get_iser_hdr(desc) + sizeof(struct iser_ctrl);
}

static void *isert_get_data(struct iser_rx_desc *desc)
{
	void *data = isert_get_iser_hdr(desc) + ISER_HEADERS_LEN;

	WARN_ON((uintptr_t)data & 511);
	return data;
}

struct iser_tx_desc {
	struct iser_ctrl iser_header;
	struct iscsi_hdr iscsi_header;
	enum isert_desc_type type;
	u64		dma_addr;
	struct ib_sge	tx_sg[2];
	struct ib_cqe	tx_cqe;
	int		num_sge;
	struct ib_send_wr send_wr;
} __packed;

static inline struct iser_tx_desc *cqe_to_tx_desc(struct ib_cqe *cqe)
{
	return container_of(cqe, struct iser_tx_desc, tx_cqe);
}

struct isert_cmd {
	uint32_t		read_stag;
	uint32_t		write_stag;
	uint64_t		read_va;
	uint64_t		write_va;
	uint32_t		inv_rkey;
	u64			pdu_buf_dma;
	u32			pdu_buf_len;
	struct isert_conn	*conn;
	struct iscsit_cmd	*iscsit_cmd;
	struct iser_tx_desc	tx_desc;
	struct iser_rx_desc	*rx_desc;
	struct rdma_rw_ctx	rw;
	struct work_struct	comp_work;
	struct scatterlist	sg;
	bool			ctx_init_done;
};

static inline struct isert_cmd *tx_desc_to_cmd(struct iser_tx_desc *desc)
{
	return container_of(desc, struct isert_cmd, tx_desc);
}

struct isert_device;

struct isert_conn {
	enum iser_conn_state	state;
	u32			responder_resources;
	u32			initiator_depth;
	bool			pi_support;
	struct iser_rx_desc	*login_desc;
	char			*login_rsp_buf;
	int			login_req_len;
	u64			login_rsp_dma;
	struct iser_rx_desc	*rx_descs;
	struct ib_recv_wr	rx_wr[ISERT_QP_MAX_RECV_DTOS];
	struct iscsit_conn	*conn;
	struct list_head	node;

Annotation

Implementation Notes