drivers/scsi/snic/vnic_wq.c

Source file repositories/reference/linux-study-clean/drivers/scsi/snic/vnic_wq.c

File Facts

System
Linux kernel
Corpus path
drivers/scsi/snic/vnic_wq.c
Extension
.c
Size
4960 bytes
Lines
224
Domain
Driver Families
Bucket
drivers/scsi
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 (!wq->bufs[i]) {
			pr_err("Failed to alloc wq_bufs\n");

			return -ENOMEM;
		}
	}

	for (i = 0; i < blks; i++) {
		buf = wq->bufs[i];
		for (j = 0; j < VNIC_WQ_BUF_DFLT_BLK_ENTRIES; j++) {
			buf->index = i * VNIC_WQ_BUF_DFLT_BLK_ENTRIES + j;
			buf->desc = (u8 *)wq->ring.descs +
				wq->ring.desc_size * buf->index;
			if (buf->index + 1 == count) {
				buf->next = wq->bufs[0];
				break;
			} else if (j + 1 == VNIC_WQ_BUF_DFLT_BLK_ENTRIES) {
				buf->next = wq->bufs[i + 1];
			} else {
				buf->next = buf + 1;
				buf++;
			}
		}
	}

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

	return 0;
}

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

	vdev = wq->vdev;

	svnic_dev_free_desc_ring(vdev, &wq->ring);

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

	wq->ctrl = NULL;

}

int vnic_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;

	err = vnic_wq_get_ctrl(vdev, wq, 0, RES_TYPE_DEVCMD2);
	if (err) {
		pr_err("Failed to get devcmd2 resource\n");

		return err;
	}

	svnic_wq_disable(wq);

	err = vnic_wq_alloc_ring(vdev, wq, 0, desc_count, desc_size);
	if (err)
		return err;

	return 0;
}

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

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

	err = vnic_wq_get_ctrl(vdev, wq, index, RES_TYPE_WQ);
	if (err) {
		pr_err("Failed to hook WQ[%d] resource\n", index);

		return err;
	}

	svnic_wq_disable(wq);

	err = vnic_wq_alloc_ring(vdev, wq, index, desc_count, desc_size);

Annotation

Implementation Notes