drivers/net/netdevsim/psp.c

File Facts

System

Linux kernel

Corpus path

drivers/net/netdevsim/psp.c

Extension

.c

Size

7060 bytes

Lines

288

Domain

Driver Families

Bucket

drivers/net

Inferred role

Driver Families: operation-table or driver-model contract

Status

pattern 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 an operation table; this is where Linux turns generic core objects into subsystem-specific behavior.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/ip.h
• linux/skbuff.h
• net/ip6_checksum.h
• net/psp.h
• net/sock.h
• netdevsim.h

Detected Declarations

• function nsim_psp_handle_ext
• function nsim_do_psp
• function nsim_psp_set_config
• function nsim_rx_spi_alloc
• function nsim_assoc_add
• function nsim_key_rotate
• function nsim_assoc_del
• function nsim_get_stats
• function __nsim_psp_uninit
• function nsim_psp_uninit
• function nsim_psp_rereg_write
• function nsim_psp_init

Annotated Snippet

static const struct file_operations nsim_psp_rereg_fops = {
	.open = simple_open,
	.write = nsim_psp_rereg_write,
	.llseek = generic_file_llseek,
	.owner = THIS_MODULE,
};

int nsim_psp_init(struct netdevsim *ns)
{
	struct dentry *ddir = ns->nsim_dev_port->ddir;
	struct psp_dev *psd;

	psd = psp_dev_create(ns->netdev, &nsim_psp_ops, &nsim_psp_caps, ns);
	if (IS_ERR(psd))
		return PTR_ERR(psd);

	rcu_assign_pointer(ns->psp.dev, psd);

	mutex_init(&ns->psp.rereg_lock);
	ns->psp.rereg = debugfs_create_file("psp_rereg", 0200, ddir, ns,
					    &nsim_psp_rereg_fops);
	return 0;
}

Annotation

• Immediate include surface: `linux/ip.h`, `linux/skbuff.h`, `net/ip6_checksum.h`, `net/psp.h`, `net/sock.h`, `netdevsim.h`.
• Detected declarations: `function nsim_psp_handle_ext`, `function nsim_do_psp`, `function nsim_psp_set_config`, `function nsim_rx_spi_alloc`, `function nsim_assoc_add`, `function nsim_key_rotate`, `function nsim_assoc_del`, `function nsim_get_stats`, `function __nsim_psp_uninit`, `function nsim_psp_uninit`.
• Atlas domain: Driver Families / drivers/net.
• Implementation status: pattern implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

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.