drivers/scsi/ibmvscsi_tgt/libsrp.h

File Facts

System

Linux kernel

Corpus path

drivers/scsi/ibmvscsi_tgt/libsrp.h

Extension

.h

Size

2490 bytes

Lines

128

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.

• 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.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/list.h
• linux/kfifo.h
• scsi/srp.h

Detected Declarations

• struct srp_buf
• struct srp_queue
• struct srp_target
• struct iu_entry
• struct ibmvscsis_cmd
• enum srp_valid
• enum srp_format
• enum srp_init_msg
• enum srp_trans_event
• enum srp_status
• enum srp_mad_version
• enum srp_os_type
• enum srp_task_attributes
• function srp_cmd_direction

Annotated Snippet

struct srp_buf {
	dma_addr_t dma;
	void *buf;
};

struct srp_queue {
	void *pool;
	void *items;
	struct kfifo queue;
	spinlock_t lock;
};

struct srp_target {
	struct device *dev;

	spinlock_t lock;
	struct list_head cmd_queue;

	size_t srp_iu_size;
	struct srp_queue iu_queue;
	size_t rx_ring_size;
	struct srp_buf **rx_ring;

	void *ldata;
};

struct iu_entry {
	struct srp_target *target;

	struct list_head ilist;
	dma_addr_t remote_token;
	unsigned long flags;

	struct srp_buf *sbuf;
	u16 iu_len;
};

struct ibmvscsis_cmd;

typedef int (srp_rdma_t)(struct ibmvscsis_cmd *, struct scatterlist *, int,
			 struct srp_direct_buf *, int,
			 enum dma_data_direction, unsigned int);
int srp_target_alloc(struct srp_target *, struct device *, size_t, size_t);
void srp_target_free(struct srp_target *);
struct iu_entry *srp_iu_get(struct srp_target *);
void srp_iu_put(struct iu_entry *);
int srp_transfer_data(struct ibmvscsis_cmd *, struct srp_cmd *,
		      srp_rdma_t, int, int);
u64 srp_data_length(struct srp_cmd *cmd, enum dma_data_direction dir);
int srp_get_desc_table(struct srp_cmd *srp_cmd, enum dma_data_direction *dir,
		       u64 *data_len);
static inline int srp_cmd_direction(struct srp_cmd *cmd)
{
	return (cmd->buf_fmt >> 4) ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
}

#endif

Annotation

• Immediate include surface: `linux/list.h`, `linux/kfifo.h`, `scsi/srp.h`.
• Detected declarations: `struct srp_buf`, `struct srp_queue`, `struct srp_target`, `struct iu_entry`, `struct ibmvscsis_cmd`, `enum srp_valid`, `enum srp_format`, `enum srp_init_msg`, `enum srp_trans_event`, `enum srp_status`.
• Atlas domain: Driver Families / drivers/scsi.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.