2 * Copyright 2008-2010 Cisco Systems, Inc. All rights reserved.
3 * Copyright 2007 Nuova Systems, Inc. All rights reserved.
5 * This program is free software; you may redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; version 2 of the License.
9 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
10 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
11 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
12 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
13 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
14 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
15 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20 #include <linux/kernel.h>
21 #include <linux/errno.h>
22 #include <linux/types.h>
23 #include <linux/pci.h>
24 #include <linux/delay.h>
25 #include <linux/slab.h>
30 static int vnic_rq_alloc_bufs(struct vnic_rq *rq)
32 struct vnic_rq_buf *buf;
33 unsigned int i, j, count = rq->ring.desc_count;
34 unsigned int blks = VNIC_RQ_BUF_BLKS_NEEDED(count);
36 for (i = 0; i < blks; i++) {
37 rq->bufs[i] = kzalloc(VNIC_RQ_BUF_BLK_SZ(count), GFP_ATOMIC);
42 for (i = 0; i < blks; i++) {
44 for (j = 0; j < VNIC_RQ_BUF_BLK_ENTRIES(count); j++) {
45 buf->index = i * VNIC_RQ_BUF_BLK_ENTRIES(count) + j;
46 buf->desc = (u8 *)rq->ring.descs +
47 rq->ring.desc_size * buf->index;
48 if (buf->index + 1 == count) {
49 buf->next = rq->bufs[0];
51 } else if (j + 1 == VNIC_RQ_BUF_BLK_ENTRIES(count)) {
52 buf->next = rq->bufs[i + 1];
60 rq->to_use = rq->to_clean = rq->bufs[0];
65 void vnic_rq_free(struct vnic_rq *rq)
67 struct vnic_dev *vdev;
72 vnic_dev_free_desc_ring(vdev, &rq->ring);
74 for (i = 0; i < VNIC_RQ_BUF_BLKS_MAX; i++) {
84 int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index,
85 unsigned int desc_count, unsigned int desc_size)
92 rq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_RQ, index);
94 pr_err("Failed to hook RQ[%d] resource\n", index);
100 err = vnic_dev_alloc_desc_ring(vdev, &rq->ring, desc_count, desc_size);
104 err = vnic_rq_alloc_bufs(rq);
113 static void vnic_rq_init_start(struct vnic_rq *rq, unsigned int cq_index,
114 unsigned int fetch_index, unsigned int posted_index,
115 unsigned int error_interrupt_enable,
116 unsigned int error_interrupt_offset)
119 unsigned int count = rq->ring.desc_count;
121 paddr = (u64)rq->ring.base_addr | VNIC_PADDR_TARGET;
122 writeq(paddr, &rq->ctrl->ring_base);
123 iowrite32(count, &rq->ctrl->ring_size);
124 iowrite32(cq_index, &rq->ctrl->cq_index);
125 iowrite32(error_interrupt_enable, &rq->ctrl->error_interrupt_enable);
126 iowrite32(error_interrupt_offset, &rq->ctrl->error_interrupt_offset);
127 iowrite32(0, &rq->ctrl->dropped_packet_count);
128 iowrite32(0, &rq->ctrl->error_status);
129 iowrite32(fetch_index, &rq->ctrl->fetch_index);
130 iowrite32(posted_index, &rq->ctrl->posted_index);
132 rq->to_use = rq->to_clean =
133 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES(count)]
134 [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES(count)];
137 void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index,
138 unsigned int error_interrupt_enable,
139 unsigned int error_interrupt_offset)
143 /* Use current fetch_index as the ring starting point */
144 fetch_index = ioread32(&rq->ctrl->fetch_index);
146 if (fetch_index == 0xFFFFFFFF) { /* check for hardware gone */
147 /* Hardware surprise removal: reset fetch_index */
151 vnic_rq_init_start(rq, cq_index,
152 fetch_index, fetch_index,
153 error_interrupt_enable,
154 error_interrupt_offset);
157 unsigned int vnic_rq_error_status(struct vnic_rq *rq)
159 return ioread32(&rq->ctrl->error_status);
162 void vnic_rq_enable(struct vnic_rq *rq)
164 iowrite32(1, &rq->ctrl->enable);
167 int vnic_rq_disable(struct vnic_rq *rq)
171 iowrite32(0, &rq->ctrl->enable);
173 /* Wait for HW to ACK disable request */
174 for (wait = 0; wait < 1000; wait++) {
175 if (!(ioread32(&rq->ctrl->running)))
180 pr_err("Failed to disable RQ[%d]\n", rq->index);
185 void vnic_rq_clean(struct vnic_rq *rq,
186 void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf))
188 struct vnic_rq_buf *buf;
190 unsigned int count = rq->ring.desc_count;
195 for (i = 0; i < rq->ring.desc_count; i++) {
196 (*buf_clean)(rq, buf);
199 rq->ring.desc_avail = rq->ring.desc_count - 1;
201 /* Use current fetch_index as the ring starting point */
202 fetch_index = ioread32(&rq->ctrl->fetch_index);
204 if (fetch_index == 0xFFFFFFFF) { /* check for hardware gone */
205 /* Hardware surprise removal: reset fetch_index */
208 rq->to_use = rq->to_clean =
209 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES(count)]
210 [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES(count)];
211 iowrite32(fetch_index, &rq->ctrl->posted_index);
213 vnic_dev_clear_desc_ring(&rq->ring);