1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright 2008-2010 Cisco Systems, Inc. All rights reserved.
4 * Copyright 2007 Nuova Systems, Inc. All rights reserved.
7 #include <linux/kernel.h>
8 #include <linux/errno.h>
9 #include <linux/types.h>
10 #include <linux/pci.h>
11 #include <linux/delay.h>
12 #include <linux/slab.h>
18 static int vnic_rq_alloc_bufs(struct vnic_rq *rq)
20 struct vnic_rq_buf *buf;
21 unsigned int i, j, count = rq->ring.desc_count;
22 unsigned int blks = VNIC_RQ_BUF_BLKS_NEEDED(count);
24 for (i = 0; i < blks; i++) {
25 rq->bufs[i] = kzalloc(VNIC_RQ_BUF_BLK_SZ(count), GFP_KERNEL);
30 for (i = 0; i < blks; i++) {
32 for (j = 0; j < VNIC_RQ_BUF_BLK_ENTRIES(count); j++) {
33 buf->index = i * VNIC_RQ_BUF_BLK_ENTRIES(count) + j;
34 buf->desc = (u8 *)rq->ring.descs +
35 rq->ring.desc_size * buf->index;
36 if (buf->index + 1 == count) {
37 buf->next = rq->bufs[0];
39 } else if (j + 1 == VNIC_RQ_BUF_BLK_ENTRIES(count)) {
40 buf->next = rq->bufs[i + 1];
48 rq->to_use = rq->to_clean = rq->bufs[0];
53 void vnic_rq_free(struct vnic_rq *rq)
55 struct vnic_dev *vdev;
60 vnic_dev_free_desc_ring(vdev, &rq->ring);
62 for (i = 0; i < VNIC_RQ_BUF_BLKS_MAX; i++) {
72 int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index,
73 unsigned int desc_count, unsigned int desc_size)
80 rq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_RQ, index);
82 vdev_err(vdev, "Failed to hook RQ[%d] resource\n", index);
88 err = vnic_dev_alloc_desc_ring(vdev, &rq->ring, desc_count, desc_size);
92 err = vnic_rq_alloc_bufs(rq);
101 static void vnic_rq_init_start(struct vnic_rq *rq, unsigned int cq_index,
102 unsigned int fetch_index, unsigned int posted_index,
103 unsigned int error_interrupt_enable,
104 unsigned int error_interrupt_offset)
107 unsigned int count = rq->ring.desc_count;
109 paddr = (u64)rq->ring.base_addr | VNIC_PADDR_TARGET;
110 writeq(paddr, &rq->ctrl->ring_base);
111 iowrite32(count, &rq->ctrl->ring_size);
112 iowrite32(cq_index, &rq->ctrl->cq_index);
113 iowrite32(error_interrupt_enable, &rq->ctrl->error_interrupt_enable);
114 iowrite32(error_interrupt_offset, &rq->ctrl->error_interrupt_offset);
115 iowrite32(0, &rq->ctrl->dropped_packet_count);
116 iowrite32(0, &rq->ctrl->error_status);
117 iowrite32(fetch_index, &rq->ctrl->fetch_index);
118 iowrite32(posted_index, &rq->ctrl->posted_index);
120 rq->to_use = rq->to_clean =
121 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES(count)]
122 [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES(count)];
125 void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index,
126 unsigned int error_interrupt_enable,
127 unsigned int error_interrupt_offset)
129 vnic_rq_init_start(rq, cq_index, 0, 0, error_interrupt_enable,
130 error_interrupt_offset);
133 unsigned int vnic_rq_error_status(struct vnic_rq *rq)
135 return ioread32(&rq->ctrl->error_status);
138 void vnic_rq_enable(struct vnic_rq *rq)
140 iowrite32(1, &rq->ctrl->enable);
143 int vnic_rq_disable(struct vnic_rq *rq)
146 struct vnic_dev *vdev = rq->vdev;
149 /* Due to a race condition with clearing RQ "mini-cache" in hw, we need
150 * to disable the RQ twice to guarantee that stale descriptors are not
151 * used when this RQ is re-enabled.
153 for (i = 0; i < 2; i++) {
154 iowrite32(0, &rq->ctrl->enable);
156 /* Wait for HW to ACK disable request */
157 for (wait = 20000; wait > 0; wait--)
158 if (!ioread32(&rq->ctrl->running))
161 vdev_neterr(vdev, "Failed to disable RQ[%d]\n",
171 void vnic_rq_clean(struct vnic_rq *rq,
172 void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf))
174 struct vnic_rq_buf *buf;
176 unsigned int count = rq->ring.desc_count;
181 for (i = 0; i < rq->ring.desc_count; i++) {
182 (*buf_clean)(rq, buf);
185 rq->ring.desc_avail = rq->ring.desc_count - 1;
187 /* Use current fetch_index as the ring starting point */
188 fetch_index = ioread32(&rq->ctrl->fetch_index);
190 if (fetch_index == 0xFFFFFFFF) { /* check for hardware gone */
191 /* Hardware surprise removal: reset fetch_index */
194 rq->to_use = rq->to_clean =
195 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES(count)]
196 [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES(count)];
197 iowrite32(fetch_index, &rq->ctrl->posted_index);
199 /* Anytime we write fetch_index, we need to re-write 0 to rq->enable
200 * to re-sync internal VIC state.
202 iowrite32(0, &rq->ctrl->enable);
204 vnic_dev_clear_desc_ring(&rq->ring);