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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_rq.h"16#include "enic.h"17 18static int vnic_rq_alloc_bufs(struct vnic_rq *rq)19{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);23 24 for (i = 0; i < blks; i++) {25 rq->bufs[i] = kzalloc(VNIC_RQ_BUF_BLK_SZ(count), GFP_KERNEL);26 if (!rq->bufs[i])27 return -ENOMEM;28 }29 30 for (i = 0; i < blks; i++) {31 buf = rq->bufs[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];38 break;39 } else if (j + 1 == VNIC_RQ_BUF_BLK_ENTRIES(count)) {40 buf->next = rq->bufs[i + 1];41 } else {42 buf->next = buf + 1;43 buf++;44 }45 }46 }47 48 rq->to_use = rq->to_clean = rq->bufs[0];49 50 return 0;51}52 53void vnic_rq_free(struct vnic_rq *rq)54{55 struct vnic_dev *vdev;56 unsigned int i;57 58 vdev = rq->vdev;59 60 vnic_dev_free_desc_ring(vdev, &rq->ring);61 62 for (i = 0; i < VNIC_RQ_BUF_BLKS_MAX; i++) {63 if (rq->bufs[i]) {64 kfree(rq->bufs[i]);65 rq->bufs[i] = NULL;66 }67 }68 69 rq->ctrl = NULL;70}71 72int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index,73 unsigned int desc_count, unsigned int desc_size)74{75 int err;76 77 rq->index = index;78 rq->vdev = vdev;79 80 rq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_RQ, index);81 if (!rq->ctrl) {82 vdev_err(vdev, "Failed to hook RQ[%d] resource\n", index);83 return -EINVAL;84 }85 86 vnic_rq_disable(rq);87 88 err = vnic_dev_alloc_desc_ring(vdev, &rq->ring, desc_count, desc_size);89 if (err)90 return err;91 92 err = vnic_rq_alloc_bufs(rq);93 if (err) {94 vnic_rq_free(rq);95 return err;96 }97 98 return 0;99}100 101static 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)105{106 u64 paddr;107 unsigned int count = rq->ring.desc_count;108 109 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);119 120 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)];123}124 125void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index,126 unsigned int error_interrupt_enable,127 unsigned int error_interrupt_offset)128{129 vnic_rq_init_start(rq, cq_index, 0, 0, error_interrupt_enable,130 error_interrupt_offset);131}132 133unsigned int vnic_rq_error_status(struct vnic_rq *rq)134{135 return ioread32(&rq->ctrl->error_status);136}137 138void vnic_rq_enable(struct vnic_rq *rq)139{140 iowrite32(1, &rq->ctrl->enable);141}142 143int vnic_rq_disable(struct vnic_rq *rq)144{145 unsigned int wait;146 struct vnic_dev *vdev = rq->vdev;147 int i;148 149 /* Due to a race condition with clearing RQ "mini-cache" in hw, we need150 * to disable the RQ twice to guarantee that stale descriptors are not151 * used when this RQ is re-enabled.152 */153 for (i = 0; i < 2; i++) {154 iowrite32(0, &rq->ctrl->enable);155 156 /* Wait for HW to ACK disable request */157 for (wait = 20000; wait > 0; wait--)158 if (!ioread32(&rq->ctrl->running))159 break;160 if (!wait) {161 vdev_neterr(vdev, "Failed to disable RQ[%d]\n",162 rq->index);163 164 return -ETIMEDOUT;165 }166 }167 168 return 0;169}170 171void vnic_rq_clean(struct vnic_rq *rq,172 void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf))173{174 struct vnic_rq_buf *buf;175 u32 fetch_index;176 unsigned int count = rq->ring.desc_count;177 int i;178 179 buf = rq->to_clean;180 181 for (i = 0; i < rq->ring.desc_count; i++) {182 (*buf_clean)(rq, buf);183 buf = buf->next;184 }185 rq->ring.desc_avail = rq->ring.desc_count - 1;186 187 /* Use current fetch_index as the ring starting point */188 fetch_index = ioread32(&rq->ctrl->fetch_index);189 190 if (fetch_index == 0xFFFFFFFF) { /* check for hardware gone */191 /* Hardware surprise removal: reset fetch_index */192 fetch_index = 0;193 }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);198 199 /* Anytime we write fetch_index, we need to re-write 0 to rq->enable200 * to re-sync internal VIC state.201 */202 iowrite32(0, &rq->ctrl->enable);203 204 vnic_dev_clear_desc_ring(&rq->ring);205}206