2 * Copyright 2014 Cisco Systems, Inc. All rights reserved.
4 * This program is free software; you may redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
8 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
9 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
10 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
11 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
12 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
13 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
14 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
18 #include <linux/errno.h>
19 #include <linux/types.h>
20 #include <linux/pci.h>
21 #include <linux/delay.h>
22 #include <linux/slab.h>
26 static inline int vnic_wq_get_ctrl(struct vnic_dev *vdev, struct vnic_wq *wq,
27 unsigned int index, enum vnic_res_type res_type)
29 wq->ctrl = svnic_dev_get_res(vdev, res_type, index);
36 static inline int vnic_wq_alloc_ring(struct vnic_dev *vdev, struct vnic_wq *wq,
37 unsigned int index, unsigned int desc_count, unsigned int desc_size)
39 return svnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count,
43 static int vnic_wq_alloc_bufs(struct vnic_wq *wq)
45 struct vnic_wq_buf *buf;
46 unsigned int i, j, count = wq->ring.desc_count;
47 unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count);
49 for (i = 0; i < blks; i++) {
50 wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ, GFP_ATOMIC);
52 pr_err("Failed to alloc wq_bufs\n");
58 for (i = 0; i < blks; i++) {
60 for (j = 0; j < VNIC_WQ_BUF_DFLT_BLK_ENTRIES; j++) {
61 buf->index = i * VNIC_WQ_BUF_DFLT_BLK_ENTRIES + j;
62 buf->desc = (u8 *)wq->ring.descs +
63 wq->ring.desc_size * buf->index;
64 if (buf->index + 1 == count) {
65 buf->next = wq->bufs[0];
67 } else if (j + 1 == VNIC_WQ_BUF_DFLT_BLK_ENTRIES) {
68 buf->next = wq->bufs[i + 1];
76 wq->to_use = wq->to_clean = wq->bufs[0];
81 void svnic_wq_free(struct vnic_wq *wq)
83 struct vnic_dev *vdev;
88 svnic_dev_free_desc_ring(vdev, &wq->ring);
90 for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) {
99 int vnic_wq_devcmd2_alloc(struct vnic_dev *vdev, struct vnic_wq *wq,
100 unsigned int desc_count, unsigned int desc_size)
107 err = vnic_wq_get_ctrl(vdev, wq, 0, RES_TYPE_DEVCMD2);
109 pr_err("Failed to get devcmd2 resource\n");
114 svnic_wq_disable(wq);
116 err = vnic_wq_alloc_ring(vdev, wq, 0, desc_count, desc_size);
123 int svnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq,
124 unsigned int index, unsigned int desc_count, unsigned int desc_size)
131 err = vnic_wq_get_ctrl(vdev, wq, index, RES_TYPE_WQ);
133 pr_err("Failed to hook WQ[%d] resource\n", index);
138 svnic_wq_disable(wq);
140 err = vnic_wq_alloc_ring(vdev, wq, index, desc_count, desc_size);
144 err = vnic_wq_alloc_bufs(wq);
154 void vnic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index,
155 unsigned int fetch_index, unsigned int posted_index,
156 unsigned int error_interrupt_enable,
157 unsigned int error_interrupt_offset)
160 unsigned int count = wq->ring.desc_count;
162 paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
163 writeq(paddr, &wq->ctrl->ring_base);
164 iowrite32(count, &wq->ctrl->ring_size);
165 iowrite32(fetch_index, &wq->ctrl->fetch_index);
166 iowrite32(posted_index, &wq->ctrl->posted_index);
167 iowrite32(cq_index, &wq->ctrl->cq_index);
168 iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
169 iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
170 iowrite32(0, &wq->ctrl->error_status);
172 wq->to_use = wq->to_clean =
173 &wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES(count)]
174 [fetch_index % VNIC_WQ_BUF_BLK_ENTRIES(count)];
177 void svnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
178 unsigned int error_interrupt_enable,
179 unsigned int error_interrupt_offset)
181 vnic_wq_init_start(wq, cq_index, 0, 0, error_interrupt_enable,
182 error_interrupt_offset);
185 unsigned int svnic_wq_error_status(struct vnic_wq *wq)
187 return ioread32(&wq->ctrl->error_status);
190 void svnic_wq_enable(struct vnic_wq *wq)
192 iowrite32(1, &wq->ctrl->enable);
195 int svnic_wq_disable(struct vnic_wq *wq)
199 iowrite32(0, &wq->ctrl->enable);
201 /* Wait for HW to ACK disable request */
202 for (wait = 0; wait < 100; wait++) {
203 if (!(ioread32(&wq->ctrl->running)))
208 pr_err("Failed to disable WQ[%d]\n", wq->index);
213 void svnic_wq_clean(struct vnic_wq *wq,
214 void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf))
216 struct vnic_wq_buf *buf;
218 BUG_ON(ioread32(&wq->ctrl->enable));
222 while (svnic_wq_desc_used(wq) > 0) {
224 (*buf_clean)(wq, buf);
226 buf = wq->to_clean = buf->next;
227 wq->ring.desc_avail++;
230 wq->to_use = wq->to_clean = wq->bufs[0];
232 iowrite32(0, &wq->ctrl->fetch_index);
233 iowrite32(0, &wq->ctrl->posted_index);
234 iowrite32(0, &wq->ctrl->error_status);
236 svnic_dev_clear_desc_ring(&wq->ring);