drivers/net/ethernet/cisco/enic/vnic_rq.c

Source file repositories/reference/linux-study-clean/drivers/net/ethernet/cisco/enic/vnic_rq.c

File Facts

System
Linux kernel
Corpus path
drivers/net/ethernet/cisco/enic/vnic_rq.c
Extension
.c
Size
5279 bytes
Lines
214
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.

Dependency Surface

Detected Declarations

Annotated Snippet

if (buf->index + 1 == count) {
				buf->next = rq->bufs[0];
				break;
			} else if (j + 1 == VNIC_RQ_BUF_BLK_ENTRIES(count)) {
				buf->next = rq->bufs[i + 1];
			} else {
				buf->next = buf + 1;
				buf++;
			}
		}
	}

	rq->to_use = rq->to_clean = rq->bufs[0];

	return 0;
}

void vnic_rq_free(struct vnic_rq *rq)
{
	struct vnic_dev *vdev;
	unsigned int i;

	vdev = rq->vdev;

	vnic_dev_free_desc_ring(vdev, &rq->ring);

	for (i = 0; i < VNIC_RQ_BUF_BLKS_MAX; i++) {
		if (rq->bufs[i]) {
			kfree(rq->bufs[i]);
			rq->bufs[i] = NULL;
		}
	}

	rq->ctrl = NULL;
}

int vnic_rq_alloc_with_type(struct vnic_dev *vdev, struct vnic_rq *rq,
			    unsigned int index, unsigned int desc_count,
			    unsigned int desc_size, unsigned int res_type)
{
	int err;

	rq->index = index;
	rq->vdev = vdev;

	rq->ctrl = vnic_dev_get_res(vdev, res_type, index);
	if (!rq->ctrl) {
		vdev_err(vdev, "Failed to hook RQ[%d] resource\n", index);
		return -EINVAL;
	}

	vnic_rq_disable(rq);

	err = vnic_dev_alloc_desc_ring(vdev, &rq->ring, desc_count, desc_size);
	if (err)
		return err;

	err = vnic_rq_alloc_bufs(rq);
	if (err) {
		vnic_rq_free(rq);
		return err;
	}

	return 0;
}

int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index,
		  unsigned int desc_count, unsigned int desc_size)
{
	return vnic_rq_alloc_with_type(vdev, rq, index, desc_count, desc_size,
				       RES_TYPE_RQ);
}

static void vnic_rq_init_start(struct vnic_rq *rq, unsigned int cq_index,
	unsigned int fetch_index, unsigned int posted_index,
	unsigned int error_interrupt_enable,
	unsigned int error_interrupt_offset)
{
	u64 paddr;
	unsigned int count = rq->ring.desc_count;

	paddr = (u64)rq->ring.base_addr | VNIC_PADDR_TARGET;
	writeq(paddr, &rq->ctrl->ring_base);
	iowrite32(count, &rq->ctrl->ring_size);
	iowrite32(cq_index, &rq->ctrl->cq_index);
	iowrite32(error_interrupt_enable, &rq->ctrl->error_interrupt_enable);
	iowrite32(error_interrupt_offset, &rq->ctrl->error_interrupt_offset);
	iowrite32(0, &rq->ctrl->dropped_packet_count);
	iowrite32(0, &rq->ctrl->error_status);
	iowrite32(fetch_index, &rq->ctrl->fetch_index);

Annotation

Implementation Notes