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

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

File Facts

System
Linux kernel
Corpus path
drivers/net/ethernet/cisco/enic/vnic_wq.c
Extension
.c
Size
4932 bytes
Lines
213
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 = wq->bufs[0];
				buf->next->prev = buf;
				break;
			} else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES(count)) {
				buf->next = wq->bufs[i + 1];
				buf->next->prev = buf;
			} else {
				buf->next = buf + 1;
				buf->next->prev = buf;
				buf++;
			}
		}
	}

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

	return 0;
}

void vnic_wq_free(struct vnic_wq *wq)
{
	struct vnic_dev *vdev;
	unsigned int i;

	vdev = wq->vdev;

	vnic_dev_free_desc_ring(vdev, &wq->ring);

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

	wq->ctrl = NULL;
}

int vnic_wq_alloc_with_type(struct vnic_dev *vdev, struct vnic_wq *wq,
			    unsigned int index, unsigned int desc_count,
			    unsigned int desc_size, unsigned int res_type)
{
	int err;

	wq->index = index;
	wq->vdev = vdev;

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

	vnic_wq_disable(wq);

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

	err = vnic_wq_alloc_bufs(wq);
	if (err) {
		vnic_wq_free(wq);
		return err;
	}

	return 0;
}

int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index,
		  unsigned int desc_count, unsigned int desc_size)
{
	return vnic_wq_alloc_with_type(vdev, wq, index, desc_count, desc_size,
				       RES_TYPE_WQ);
}

int enic_wq_devcmd2_alloc(struct vnic_dev *vdev, struct vnic_wq *wq,
			  unsigned int desc_count, unsigned int desc_size)
{
	int err;

	wq->index = 0;
	wq->vdev = vdev;

	wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_DEVCMD2, 0);
	if (!wq->ctrl)
		return -EINVAL;
	vnic_wq_disable(wq);
	err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);

Annotation

Implementation Notes