[SCSI] fnic: Add new Cisco PCI-Express FCoE HBA

fnic is a driver for the Cisco PCI-Express FCoE HBA

Signed-off-by: Abhijeet Joglekar <abjoglek@cisco.com>
Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 196 insertions, 0 deletions

diff --git a/drivers/scsi/fnic/vnic_rq.c b/drivers/scsi/fnic/vnic_rq.c
new file mode 100644
index 00000000000..bedd0d28563
--- /dev/null
+++ b/drivers/scsi/fnic/vnic_rq.c
@@ -0,0 +1,196 @@
+/*
+ * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
+ * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
+ *
+ * This program is free software; you may redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include "vnic_dev.h"
+#include "vnic_rq.h"
+
+static int vnic_rq_alloc_bufs(struct vnic_rq *rq)
+{
+	struct vnic_rq_buf *buf;
+	struct vnic_dev *vdev;
+	unsigned int i, j, count = rq->ring.desc_count;
+	unsigned int blks = VNIC_RQ_BUF_BLKS_NEEDED(count);
+
+	vdev = rq->vdev;
+
+	for (i = 0; i < blks; i++) {
+		rq->bufs[i] = kzalloc(VNIC_RQ_BUF_BLK_SZ, GFP_ATOMIC);
+		if (!rq->bufs[i]) {
+			printk(KERN_ERR "Failed to alloc rq_bufs\n");
+			return -ENOMEM;
+		}
+	}
+
+	for (i = 0; i < blks; i++) {
+		buf = rq->bufs[i];
+		for (j = 0; j < VNIC_RQ_BUF_BLK_ENTRIES; j++) {
+			buf->index = i * VNIC_RQ_BUF_BLK_ENTRIES + j;
+			buf->desc = (u8 *)rq->ring.descs +
+				rq->ring.desc_size * buf->index;
+			if (buf->index + 1 == count) {
+				buf->next = rq->bufs[0];
+				break;
+			} else if (j + 1 == VNIC_RQ_BUF_BLK_ENTRIES) {
+				buf->next = rq->bufs[i + 1];
+			} else {
+				buf->next = buf + 1;
+				buf++;
+			}
+		}
+	}
+
+	rq->to_use = rq->to_clean = rq->bufs[0];
+	rq->buf_index = 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++) {
+		kfree(rq->bufs[i]);
+		rq->bufs[i] = NULL;
+	}
+
+	rq->ctrl = NULL;
+}
+
+int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index,
+	unsigned int desc_count, unsigned int desc_size)
+{
+	int err;
+
+	rq->index = index;
+	rq->vdev = vdev;
+
+	rq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_RQ, index);
+	if (!rq->ctrl) {
+		printk(KERN_ERR "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;
+}
+
+void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index,
+	unsigned int error_interrupt_enable,
+	unsigned int error_interrupt_offset)
+{
+	u64 paddr;
+	u32 fetch_index;
+
+	paddr = (u64)rq->ring.base_addr | VNIC_PADDR_TARGET;
+	writeq(paddr, &rq->ctrl->ring_base);
+	iowrite32(rq->ring.desc_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);
+
+	/* Use current fetch_index as the ring starting point */
+	fetch_index = ioread32(&rq->ctrl->fetch_index);
+	rq->to_use = rq->to_clean =
+		&rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES]
+			[fetch_index % VNIC_RQ_BUF_BLK_ENTRIES];
+	iowrite32(fetch_index, &rq->ctrl->posted_index);
+
+	rq->buf_index = 0;
+}
+
+unsigned int vnic_rq_error_status(struct vnic_rq *rq)
+{
+	return ioread32(&rq->ctrl->error_status);
+}
+
+void vnic_rq_enable(struct vnic_rq *rq)
+{
+	iowrite32(1, &rq->ctrl->enable);
+}
+
+int vnic_rq_disable(struct vnic_rq *rq)
+{
+	unsigned int wait;
+
+	iowrite32(0, &rq->ctrl->enable);
+
+	/* Wait for HW to ACK disable request */
+	for (wait = 0; wait < 100; wait++) {
+		if (!(ioread32(&rq->ctrl->running)))
+			return 0;
+		udelay(1);
+	}
+
+	printk(KERN_ERR "Failed to disable RQ[%d]\n", rq->index);
+
+	return -ETIMEDOUT;
+}
+
+void vnic_rq_clean(struct vnic_rq *rq,
+	void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf))
+{
+	struct vnic_rq_buf *buf;
+	u32 fetch_index;
+
+	BUG_ON(ioread32(&rq->ctrl->enable));
+
+	buf = rq->to_clean;
+
+	while (vnic_rq_desc_used(rq) > 0) {
+
+		(*buf_clean)(rq, buf);
+
+		buf = rq->to_clean = buf->next;
+		rq->ring.desc_avail++;
+	}
+
+	/* Use current fetch_index as the ring starting point */
+	fetch_index = ioread32(&rq->ctrl->fetch_index);
+	rq->to_use = rq->to_clean =
+		&rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES]
+			[fetch_index % VNIC_RQ_BUF_BLK_ENTRIES];
+	iowrite32(fetch_index, &rq->ctrl->posted_index);
+
+	rq->buf_index = 0;
+
+	vnic_dev_clear_desc_ring(&rq->ring);
+}
+