arch/um/drivers/vector_user.h

File Facts

System

Linux kernel

Corpus path

arch/um/drivers/vector_user.h

Extension

.h

Size

2490 bytes

Lines

108

Domain

Architecture Layer

Bucket

arch/um

Inferred role

Architecture Layer: implementation source

Status

source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

• CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• No C-style include directives detected by the generator.

Detected Declarations

• struct arglist
• struct vector_fds

Annotated Snippet

struct arglist {
	int	numargs;
	char	*tokens[MAXVARGS];
	char	*values[MAXVARGS];
};

/* Separating read and write FDs allows us to have different
 * rx and tx method. Example - read tap via raw socket using
 * recvmmsg, write using legacy tap write calls
 */

struct vector_fds {
	int rx_fd;
	int tx_fd;
	void *remote_addr;
	int remote_addr_size;
};

#define VECTOR_READ	1

extern struct arglist *uml_parse_vector_ifspec(char *arg);

extern struct vector_fds *uml_vector_user_open(
	int unit,
	struct arglist *parsed
);

extern char *uml_vector_fetch_arg(
	struct arglist *ifspec,
	char *token
);

extern int uml_vector_recvmsg(int fd, void *hdr, int flags);
extern int uml_vector_sendmsg(int fd, void *hdr, int flags);
extern int uml_vector_writev(int fd, void *hdr, int iovcount);
extern int uml_vector_sendmmsg(
	int fd, void *msgvec,
	unsigned int vlen,
	unsigned int flags
);
extern int uml_vector_recvmmsg(
	int fd,
	void *msgvec,
	unsigned int vlen,
	unsigned int flags
);
extern void *uml_vector_default_bpf(const void *mac);
extern void *uml_vector_user_bpf(char *filename);
extern int uml_vector_attach_bpf(int fd, void *bpf);
extern int uml_vector_detach_bpf(int fd, void *bpf);
extern bool uml_raw_enable_qdisc_bypass(int fd);
extern bool uml_raw_enable_vnet_headers(int fd);
extern bool uml_tap_enable_vnet_headers(int fd);


#endif

Annotation

• Detected declarations: `struct arglist`, `struct vector_fds`.
• Atlas domain: Architecture Layer / arch/um.
• 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.