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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright 2008-2010 Cisco Systems, Inc. All rights reserved.4 * Copyright 2007 Nuova Systems, Inc. All rights reserved.5 */6 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>13 14#include "vnic_dev.h"15#include "vnic_wq.h"16#include "enic.h"17 18static int vnic_wq_alloc_bufs(struct vnic_wq *wq)19{20 struct vnic_wq_buf *buf;21 unsigned int i, j, count = wq->ring.desc_count;22 unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count);23 24 for (i = 0; i < blks; i++) {25 wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ(count), GFP_KERNEL);26 if (!wq->bufs[i])27 return -ENOMEM;28 }29 30 for (i = 0; i < blks; i++) {31 buf = wq->bufs[i];32 for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES(count); j++) {33 buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES(count) + j;34 buf->desc = (u8 *)wq->ring.descs +35 wq->ring.desc_size * buf->index;36 if (buf->index + 1 == count) {37 buf->next = wq->bufs[0];38 buf->next->prev = buf;39 break;40 } else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES(count)) {41 buf->next = wq->bufs[i + 1];42 buf->next->prev = buf;43 } else {44 buf->next = buf + 1;45 buf->next->prev = buf;46 buf++;47 }48 }49 }50 51 wq->to_use = wq->to_clean = wq->bufs[0];52 53 return 0;54}55 56void vnic_wq_free(struct vnic_wq *wq)57{58 struct vnic_dev *vdev;59 unsigned int i;60 61 vdev = wq->vdev;62 63 vnic_dev_free_desc_ring(vdev, &wq->ring);64 65 for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) {66 if (wq->bufs[i]) {67 kfree(wq->bufs[i]);68 wq->bufs[i] = NULL;69 }70 }71 72 wq->ctrl = NULL;73}74 75int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index,76 unsigned int desc_count, unsigned int desc_size)77{78 int err;79 80 wq->index = index;81 wq->vdev = vdev;82 83 wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);84 if (!wq->ctrl) {85 vdev_err(vdev, "Failed to hook WQ[%d] resource\n", index);86 return -EINVAL;87 }88 89 vnic_wq_disable(wq);90 91 err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);92 if (err)93 return err;94 95 err = vnic_wq_alloc_bufs(wq);96 if (err) {97 vnic_wq_free(wq);98 return err;99 }100 101 return 0;102}103 104int enic_wq_devcmd2_alloc(struct vnic_dev *vdev, struct vnic_wq *wq,105 unsigned int desc_count, unsigned int desc_size)106{107 int err;108 109 wq->index = 0;110 wq->vdev = vdev;111 112 wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_DEVCMD2, 0);113 if (!wq->ctrl)114 return -EINVAL;115 vnic_wq_disable(wq);116 err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);117 118 return err;119}120 121void enic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index,122 unsigned int fetch_index, unsigned int posted_index,123 unsigned int error_interrupt_enable,124 unsigned int error_interrupt_offset)125{126 u64 paddr;127 unsigned int count = wq->ring.desc_count;128 129 paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;130 writeq(paddr, &wq->ctrl->ring_base);131 iowrite32(count, &wq->ctrl->ring_size);132 iowrite32(fetch_index, &wq->ctrl->fetch_index);133 iowrite32(posted_index, &wq->ctrl->posted_index);134 iowrite32(cq_index, &wq->ctrl->cq_index);135 iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);136 iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);137 iowrite32(0, &wq->ctrl->error_status);138 139 wq->to_use = wq->to_clean =140 &wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES(count)]141 [fetch_index % VNIC_WQ_BUF_BLK_ENTRIES(count)];142}143 144void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,145 unsigned int error_interrupt_enable,146 unsigned int error_interrupt_offset)147{148 enic_wq_init_start(wq, cq_index, 0, 0,149 error_interrupt_enable,150 error_interrupt_offset);151}152 153unsigned int vnic_wq_error_status(struct vnic_wq *wq)154{155 return ioread32(&wq->ctrl->error_status);156}157 158void vnic_wq_enable(struct vnic_wq *wq)159{160 iowrite32(1, &wq->ctrl->enable);161}162 163int vnic_wq_disable(struct vnic_wq *wq)164{165 unsigned int wait;166 struct vnic_dev *vdev = wq->vdev;167 168 iowrite32(0, &wq->ctrl->enable);169 170 /* Wait for HW to ACK disable request */171 for (wait = 0; wait < 1000; wait++) {172 if (!(ioread32(&wq->ctrl->running)))173 return 0;174 udelay(10);175 }176 177 vdev_neterr(vdev, "Failed to disable WQ[%d]\n", wq->index);178 179 return -ETIMEDOUT;180}181 182void vnic_wq_clean(struct vnic_wq *wq,183 void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf))184{185 struct vnic_wq_buf *buf;186 187 buf = wq->to_clean;188 189 while (vnic_wq_desc_used(wq) > 0) {190 191 (*buf_clean)(wq, buf);192 193 buf = wq->to_clean = buf->next;194 wq->ring.desc_avail++;195 }196 197 wq->to_use = wq->to_clean = wq->bufs[0];198 199 iowrite32(0, &wq->ctrl->fetch_index);200 iowrite32(0, &wq->ctrl->posted_index);201 iowrite32(0, &wq->ctrl->error_status);202 203 vnic_dev_clear_desc_ring(&wq->ring);204}205