drivers/infiniband/core/ud_header.c

File Facts

System

Linux kernel

Corpus path

drivers/infiniband/core/ud_header.c

Extension

.c

Size

12594 bytes

Lines

465

Domain

Driver Families

Bucket

drivers/infiniband

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.

• 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.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/errno.h
• linux/string.h
• linux/export.h
• linux/if_ether.h
• linux/ip.h
• rdma/ib_pack.h

Detected Declarations

• function ib_ud_ip4_csum
• function ib_ud_header_init
• function ib_ud_header_pack
• export ib_ud_ip4_csum
• export ib_ud_header_init
• export ib_ud_header_pack

Annotated Snippet

#include <linux/errno.h>
#include <linux/string.h>
#include <linux/export.h>
#include <linux/if_ether.h>
#include <linux/ip.h>

#include <rdma/ib_pack.h>

#define STRUCT_FIELD(header, field) \
	.struct_offset_bytes = offsetof(struct ib_unpacked_ ## header, field),      \
	.struct_size_bytes   = sizeof_field(struct ib_unpacked_ ## header, field), \
	.field_name          = #header ":" #field

static const struct ib_field lrh_table[]  = {
	{ STRUCT_FIELD(lrh, virtual_lane),
	  .offset_words = 0,
	  .offset_bits  = 0,
	  .size_bits    = 4 },
	{ STRUCT_FIELD(lrh, link_version),
	  .offset_words = 0,
	  .offset_bits  = 4,
	  .size_bits    = 4 },
	{ STRUCT_FIELD(lrh, service_level),
	  .offset_words = 0,
	  .offset_bits  = 8,
	  .size_bits    = 4 },
	{ RESERVED,
	  .offset_words = 0,
	  .offset_bits  = 12,
	  .size_bits    = 2 },
	{ STRUCT_FIELD(lrh, link_next_header),
	  .offset_words = 0,
	  .offset_bits  = 14,
	  .size_bits    = 2 },
	{ STRUCT_FIELD(lrh, destination_lid),
	  .offset_words = 0,
	  .offset_bits  = 16,
	  .size_bits    = 16 },
	{ RESERVED,
	  .offset_words = 1,
	  .offset_bits  = 0,
	  .size_bits    = 5 },
	{ STRUCT_FIELD(lrh, packet_length),
	  .offset_words = 1,
	  .offset_bits  = 5,
	  .size_bits    = 11 },
	{ STRUCT_FIELD(lrh, source_lid),
	  .offset_words = 1,
	  .offset_bits  = 16,
	  .size_bits    = 16 }
};

static const struct ib_field eth_table[]  = {
	{ STRUCT_FIELD(eth, dmac_h),
	  .offset_words = 0,
	  .offset_bits  = 0,
	  .size_bits    = 32 },
	{ STRUCT_FIELD(eth, dmac_l),
	  .offset_words = 1,
	  .offset_bits  = 0,
	  .size_bits    = 16 },
	{ STRUCT_FIELD(eth, smac_h),
	  .offset_words = 1,
	  .offset_bits  = 16,
	  .size_bits    = 16 },
	{ STRUCT_FIELD(eth, smac_l),
	  .offset_words = 2,
	  .offset_bits  = 0,
	  .size_bits    = 32 },
	{ STRUCT_FIELD(eth, type),
	  .offset_words = 3,
	  .offset_bits  = 0,
	  .size_bits    = 16 }
};

static const struct ib_field vlan_table[]  = {
	{ STRUCT_FIELD(vlan, tag),
	  .offset_words = 0,
	  .offset_bits  = 0,
	  .size_bits    = 16 },
	{ STRUCT_FIELD(vlan, type),
	  .offset_words = 0,
	  .offset_bits  = 16,
	  .size_bits    = 16 }
};

static const struct ib_field ip4_table[]  = {
	{ STRUCT_FIELD(ip4, ver),
	  .offset_words = 0,
	  .offset_bits  = 0,

Annotation

• Immediate include surface: `linux/errno.h`, `linux/string.h`, `linux/export.h`, `linux/if_ether.h`, `linux/ip.h`, `rdma/ib_pack.h`.
• Detected declarations: `function ib_ud_ip4_csum`, `function ib_ud_header_init`, `function ib_ud_header_pack`, `export ib_ud_ip4_csum`, `export ib_ud_header_init`, `export ib_ud_header_pack`.
• Atlas domain: Driver Families / drivers/infiniband.
• Implementation status: integration 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.