drivers/net/ethernet/amazon/ena/ena_xdp.h

File Facts

System

Linux kernel

Corpus path

drivers/net/ethernet/amazon/ena/ena_xdp.h

Extension

.h

Size

4300 bytes

Lines

152

Domain

Driver Families

Bucket

drivers/net

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

• ena_netdev.h
• linux/bpf_trace.h

Detected Declarations

• enum ENA_XDP_ACTIONS
• enum ena_xdp_errors_t
• function ena_xdp_present
• function ena_xdp_present_ring
• function ena_xdp_legal_queue_count
• function ena_xdp_allowed
• function ena_xdp_execute

Annotated Snippet

if (unlikely(!xdpf)) {
			trace_xdp_exception(rx_ring->netdev, xdp_prog, verdict);
			xdp_stat = &rx_ring->rx_stats.xdp_aborted;
			verdict = ENA_XDP_DROP;
			break;
		}

		/* Find xmit queue */
		xdp_ring = rx_ring->xdp_ring;

		/* The XDP queues are shared between XDP_TX and XDP_REDIRECT */
		spin_lock(&xdp_ring->xdp_tx_lock);

		if (ena_xdp_xmit_frame(xdp_ring, rx_ring->adapter, xdpf,
				       XDP_XMIT_FLUSH))
			xdp_return_frame(xdpf);

		spin_unlock(&xdp_ring->xdp_tx_lock);
		xdp_stat = &rx_ring->rx_stats.xdp_tx;
		verdict = ENA_XDP_TX;
		break;
	case XDP_REDIRECT:
		if (likely(!xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog))) {
			xdp_stat = &rx_ring->rx_stats.xdp_redirect;
			verdict = ENA_XDP_REDIRECT;
			break;
		}
		trace_xdp_exception(rx_ring->netdev, xdp_prog, verdict);
		xdp_stat = &rx_ring->rx_stats.xdp_aborted;
		verdict = ENA_XDP_DROP;
		break;
	case XDP_ABORTED:
		trace_xdp_exception(rx_ring->netdev, xdp_prog, verdict);
		xdp_stat = &rx_ring->rx_stats.xdp_aborted;
		verdict = ENA_XDP_DROP;
		break;
	case XDP_DROP:
		xdp_stat = &rx_ring->rx_stats.xdp_drop;
		verdict = ENA_XDP_DROP;
		break;
	case XDP_PASS:
		xdp_stat = &rx_ring->rx_stats.xdp_pass;
		verdict = ENA_XDP_PASS;
		break;
	default:
		bpf_warn_invalid_xdp_action(rx_ring->netdev, xdp_prog, verdict);
		xdp_stat = &rx_ring->rx_stats.xdp_invalid;
		verdict = ENA_XDP_DROP;
	}

	ena_increase_stat(xdp_stat, 1, &rx_ring->syncp);

	return verdict;
}
#endif /* ENA_XDP_H */

Annotation

• Immediate include surface: `ena_netdev.h`, `linux/bpf_trace.h`.
• Detected declarations: `enum ENA_XDP_ACTIONS`, `enum ena_xdp_errors_t`, `function ena_xdp_present`, `function ena_xdp_present_ring`, `function ena_xdp_legal_queue_count`, `function ena_xdp_allowed`, `function ena_xdp_execute`.
• Atlas domain: Driver Families / drivers/net.
• 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.