drivers/net/ethernet/microsoft/mana/hw_channel.c

File Facts

System

Linux kernel

Corpus path

drivers/net/ethernet/microsoft/mana/hw_channel.c

Extension

.c

Size

22749 bytes

Lines

938

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.
• Touches IRQ or DMA behavior; this matters for the representative real-device path.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• net/mana/gdma.h
• net/mana/mana.h
• net/mana/hw_channel.h
• linux/vmalloc.h

Detected Declarations

• function mana_hwc_get_msg_index
• function mana_hwc_put_msg_index
• function mana_hwc_verify_resp_msg
• function mana_hwc_post_rx_wqe
• function mana_hwc_handle_resp
• function mana_hwc_init_event_handler
• function mana_hwc_rx_event_handler
• function mana_hwc_tx_event_handler
• function mana_hwc_create_gdma_wq
• function mana_hwc_create_gdma_cq
• function mana_hwc_create_gdma_eq
• function mana_hwc_comp_event
• function mana_hwc_destroy_cq
• function mana_hwc_create_cq
• function mana_hwc_alloc_dma_buf
• function mana_hwc_dealloc_dma_buf
• function mana_hwc_destroy_wq
• function mana_hwc_create_wq
• function mana_hwc_post_tx_wqe
• function mana_hwc_init_inflight_msg
• function mana_hwc_test_channel
• function mana_hwc_establish_channel
• function mana_hwc_init_queues
• function mana_hwc_create_channel
• function mana_hwc_destroy_channel
• function mana_hwc_send_request

Annotated Snippet

switch (type) {
		case HWC_INIT_DATA_CQID:
			hwc->cq->gdma_cq->id = val;
			break;

		case HWC_INIT_DATA_RQID:
			hwc->rxq->gdma_wq->id = val;
			break;

		case HWC_INIT_DATA_SQID:
			hwc->txq->gdma_wq->id = val;
			break;

		case HWC_INIT_DATA_QUEUE_DEPTH:
			hwc->hwc_init_q_depth_max = (u16)val;
			break;

		case HWC_INIT_DATA_MAX_REQUEST:
			hwc->hwc_init_max_req_msg_size = val;
			break;

		case HWC_INIT_DATA_MAX_RESPONSE:
			hwc->hwc_init_max_resp_msg_size = val;
			break;

		case HWC_INIT_DATA_MAX_NUM_CQS:
			gd->gdma_context->max_num_cqs = val;
			break;

		case HWC_INIT_DATA_PDID:
			hwc->gdma_dev->pdid = val;
			break;

		case HWC_INIT_DATA_GPA_MKEY:
			hwc->rxq->msg_buf->gpa_mkey = val;
			hwc->txq->msg_buf->gpa_mkey = val;
			break;

		case HWC_INIT_DATA_PF_DEST_RQ_ID:
			hwc->pf_dest_vrq_id = val;
			break;

		case HWC_INIT_DATA_PF_DEST_CQ_ID:
			hwc->pf_dest_vrcq_id = val;
			break;
		}

		break;

	case GDMA_EQE_HWC_INIT_DONE:
		complete(&hwc->hwc_init_eqe_comp);
		break;

	case GDMA_EQE_HWC_SOC_RECONFIG_DATA:
		type_data.as_uint32 = event->details[0];
		type = type_data.type;
		val = type_data.value;

		switch (type) {
		case HWC_DATA_CFG_HWC_TIMEOUT:
			hwc->hwc_timeout = val;
			break;

		case HWC_DATA_HW_LINK_CONNECT:
		case HWC_DATA_HW_LINK_DISCONNECT:
			ac = gd->gdma_context->mana.driver_data;
			if (!ac)
				break;

			WRITE_ONCE(ac->link_event, type);
			schedule_work(&ac->link_change_work);

			break;

		default:
			dev_warn(hwc->dev, "Received unknown reconfig type %u\n", type);
			break;
		}

		break;
	case GDMA_EQE_HWC_SOC_SERVICE:
		service_data.as_uint32 = event->details[0];
		type = service_data.type;

		switch (type) {
		case GDMA_SERVICE_TYPE_RDMA_SUSPEND:
		case GDMA_SERVICE_TYPE_RDMA_RESUME:
			ret = mana_rdma_service_event(gd->gdma_context, type);
			if (ret)
				dev_err(hwc->dev, "Failed to schedule adev service event: %d\n",

Annotation

• Immediate include surface: `net/mana/gdma.h`, `net/mana/mana.h`, `net/mana/hw_channel.h`, `linux/vmalloc.h`.
• Detected declarations: `function mana_hwc_get_msg_index`, `function mana_hwc_put_msg_index`, `function mana_hwc_verify_resp_msg`, `function mana_hwc_post_rx_wqe`, `function mana_hwc_handle_resp`, `function mana_hwc_init_event_handler`, `function mana_hwc_rx_event_handler`, `function mana_hwc_tx_event_handler`, `function mana_hwc_create_gdma_wq`, `function mana_hwc_create_gdma_cq`.
• 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.
• IRQ or DMA behavior appears here, which is relevant to the selected PCIe/NVMe device path.

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.