drivers/infiniband/hw/erdma/erdma_cq.c

File Facts

System

Linux kernel

Corpus path

drivers/infiniband/hw/erdma/erdma_cq.c

Extension

.c

Size

7857 bytes

Lines

269

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.

• 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.
• 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

• erdma_verbs.h

Detected Declarations

• function notify_cq
• function erdma_req_notify_cq
• function erdma_process_ud_cqe
• function erdma_poll_one_cqe
• function erdma_poll_cq
• function erdma_remove_cqes_of_qp

Annotated Snippet

if (be32_to_cpu(cqe->qpn) == qpn) {
			++nqp_cqe;
		} else if (nqp_cqe) {
			dst_cqe = get_queue_entry(cq->kern_cq.qbuf,
						  cur_cq_ci + nqp_cqe,
						  cq->depth, CQE_SHIFT);
			owner = FIELD_GET(ERDMA_CQE_HDR_OWNER_MASK,
					  be32_to_cpu(dst_cqe->hdr));
			cqe->hdr = cpu_to_be32(
				(be32_to_cpu(cqe->hdr) &
				 ~ERDMA_CQE_HDR_OWNER_MASK) |
				FIELD_PREP(ERDMA_CQE_HDR_OWNER_MASK, owner));
			memcpy(dst_cqe, cqe, sizeof(*cqe));
		}

		--ncqe;
	}

	cq->kern_cq.ci = prev_cq_ci + nqp_cqe;
	spin_unlock_irqrestore(&cq->kern_cq.lock, flags);
}

Annotation

• Immediate include surface: `erdma_verbs.h`.
• Detected declarations: `function notify_cq`, `function erdma_req_notify_cq`, `function erdma_process_ud_cqe`, `function erdma_poll_one_cqe`, `function erdma_poll_cq`, `function erdma_remove_cqes_of_qp`.
• Atlas domain: Driver Families / drivers/infiniband.
• Implementation status: source 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.