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![Narsimhulu Musini](/assets/img/avatar_default.png)
Cisco has developed a new PCI HBA interface called sNIC, which stands for SCSI NIC. This is a new storage feature supported on specialized network adapter. The new PCI function provides a uniform host interface and abstracts backend storage. [jejb: fix up checkpatch errors] Signed-off-by: Narsimhulu Musini <nmusini@cisco.com> Signed-off-by: Sesidhar Baddela <sebaddel@cisco.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: James Bottomley <JBottomley@Odin.com>
237 lines
5.5 KiB
C
237 lines
5.5 KiB
C
/*
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* Copyright 2014 Cisco Systems, Inc. All rights reserved.
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*
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* This program is free software; you may redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/pci.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include "vnic_dev.h"
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#include "vnic_wq.h"
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static inline int vnic_wq_get_ctrl(struct vnic_dev *vdev, struct vnic_wq *wq,
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unsigned int index, enum vnic_res_type res_type)
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{
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wq->ctrl = svnic_dev_get_res(vdev, res_type, index);
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if (!wq->ctrl)
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return -EINVAL;
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return 0;
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}
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static inline int vnic_wq_alloc_ring(struct vnic_dev *vdev, struct vnic_wq *wq,
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unsigned int index, unsigned int desc_count, unsigned int desc_size)
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{
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return svnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count,
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desc_size);
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}
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static int vnic_wq_alloc_bufs(struct vnic_wq *wq)
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{
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struct vnic_wq_buf *buf;
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unsigned int i, j, count = wq->ring.desc_count;
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unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count);
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for (i = 0; i < blks; i++) {
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wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ, GFP_ATOMIC);
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if (!wq->bufs[i]) {
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pr_err("Failed to alloc wq_bufs\n");
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return -ENOMEM;
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}
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}
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for (i = 0; i < blks; i++) {
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buf = wq->bufs[i];
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for (j = 0; j < VNIC_WQ_BUF_DFLT_BLK_ENTRIES; j++) {
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buf->index = i * VNIC_WQ_BUF_DFLT_BLK_ENTRIES + j;
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buf->desc = (u8 *)wq->ring.descs +
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wq->ring.desc_size * buf->index;
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if (buf->index + 1 == count) {
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buf->next = wq->bufs[0];
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break;
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} else if (j + 1 == VNIC_WQ_BUF_DFLT_BLK_ENTRIES) {
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buf->next = wq->bufs[i + 1];
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} else {
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buf->next = buf + 1;
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buf++;
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}
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}
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}
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wq->to_use = wq->to_clean = wq->bufs[0];
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return 0;
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}
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void svnic_wq_free(struct vnic_wq *wq)
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{
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struct vnic_dev *vdev;
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unsigned int i;
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vdev = wq->vdev;
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svnic_dev_free_desc_ring(vdev, &wq->ring);
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for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) {
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kfree(wq->bufs[i]);
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wq->bufs[i] = NULL;
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}
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wq->ctrl = NULL;
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}
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int vnic_wq_devcmd2_alloc(struct vnic_dev *vdev, struct vnic_wq *wq,
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unsigned int desc_count, unsigned int desc_size)
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{
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int err;
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wq->index = 0;
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wq->vdev = vdev;
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err = vnic_wq_get_ctrl(vdev, wq, 0, RES_TYPE_DEVCMD2);
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if (err) {
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pr_err("Failed to get devcmd2 resource\n");
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return err;
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}
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svnic_wq_disable(wq);
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err = vnic_wq_alloc_ring(vdev, wq, 0, desc_count, desc_size);
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if (err)
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return err;
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return 0;
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}
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int svnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq,
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unsigned int index, unsigned int desc_count, unsigned int desc_size)
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{
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int err;
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wq->index = index;
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wq->vdev = vdev;
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err = vnic_wq_get_ctrl(vdev, wq, index, RES_TYPE_WQ);
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if (err) {
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pr_err("Failed to hook WQ[%d] resource\n", index);
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return err;
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}
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svnic_wq_disable(wq);
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err = vnic_wq_alloc_ring(vdev, wq, index, desc_count, desc_size);
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if (err)
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return err;
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err = vnic_wq_alloc_bufs(wq);
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if (err) {
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svnic_wq_free(wq);
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return err;
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}
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return 0;
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}
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void vnic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index,
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unsigned int fetch_index, unsigned int posted_index,
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unsigned int error_interrupt_enable,
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unsigned int error_interrupt_offset)
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{
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u64 paddr;
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unsigned int count = wq->ring.desc_count;
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paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
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writeq(paddr, &wq->ctrl->ring_base);
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iowrite32(count, &wq->ctrl->ring_size);
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iowrite32(fetch_index, &wq->ctrl->fetch_index);
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iowrite32(posted_index, &wq->ctrl->posted_index);
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iowrite32(cq_index, &wq->ctrl->cq_index);
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iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
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iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
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iowrite32(0, &wq->ctrl->error_status);
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wq->to_use = wq->to_clean =
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&wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES(count)]
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[fetch_index % VNIC_WQ_BUF_BLK_ENTRIES(count)];
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}
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void svnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
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unsigned int error_interrupt_enable,
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unsigned int error_interrupt_offset)
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{
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vnic_wq_init_start(wq, cq_index, 0, 0, error_interrupt_enable,
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error_interrupt_offset);
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}
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unsigned int svnic_wq_error_status(struct vnic_wq *wq)
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{
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return ioread32(&wq->ctrl->error_status);
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}
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void svnic_wq_enable(struct vnic_wq *wq)
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{
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iowrite32(1, &wq->ctrl->enable);
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}
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int svnic_wq_disable(struct vnic_wq *wq)
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{
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unsigned int wait;
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iowrite32(0, &wq->ctrl->enable);
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/* Wait for HW to ACK disable request */
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for (wait = 0; wait < 100; wait++) {
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if (!(ioread32(&wq->ctrl->running)))
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return 0;
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udelay(1);
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}
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pr_err("Failed to disable WQ[%d]\n", wq->index);
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return -ETIMEDOUT;
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}
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void svnic_wq_clean(struct vnic_wq *wq,
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void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf))
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{
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struct vnic_wq_buf *buf;
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BUG_ON(ioread32(&wq->ctrl->enable));
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buf = wq->to_clean;
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while (svnic_wq_desc_used(wq) > 0) {
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(*buf_clean)(wq, buf);
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buf = wq->to_clean = buf->next;
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wq->ring.desc_avail++;
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}
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wq->to_use = wq->to_clean = wq->bufs[0];
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iowrite32(0, &wq->ctrl->fetch_index);
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iowrite32(0, &wq->ctrl->posted_index);
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iowrite32(0, &wq->ctrl->error_status);
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svnic_dev_clear_desc_ring(&wq->ring);
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}
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