1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2008 Cisco Systems, Inc. All rights reserved. 4 * Copyright 2007 Nuova Systems, Inc. All rights reserved. 5 */ 6 7 #include <linux/errno.h> 8 #include <linux/types.h> 9 #include <linux/pci.h> 10 #include <linux/delay.h> 11 #include <linux/slab.h> 12 #include "vnic_dev.h" 13 #include "vnic_rq.h" 14 15 static int vnic_rq_alloc_bufs(struct vnic_rq *rq) 16 { 17 struct vnic_rq_buf *buf; 18 unsigned int i, j, count = rq->ring.desc_count; 19 unsigned int blks = VNIC_RQ_BUF_BLKS_NEEDED(count); 20 21 for (i = 0; i < blks; i++) { 22 rq->bufs[i] = kzalloc(VNIC_RQ_BUF_BLK_SZ, GFP_ATOMIC); 23 if (!rq->bufs[i]) { 24 printk(KERN_ERR "Failed to alloc rq_bufs\n"); 25 return -ENOMEM; 26 } 27 } 28 29 for (i = 0; i < blks; i++) { 30 buf = rq->bufs[i]; 31 for (j = 0; j < VNIC_RQ_BUF_BLK_ENTRIES; j++) { 32 buf->index = i * VNIC_RQ_BUF_BLK_ENTRIES + j; 33 buf->desc = (u8 *)rq->ring.descs + 34 rq->ring.desc_size * buf->index; 35 if (buf->index + 1 == count) { 36 buf->next = rq->bufs[0]; 37 break; 38 } else if (j + 1 == VNIC_RQ_BUF_BLK_ENTRIES) { 39 buf->next = rq->bufs[i + 1]; 40 } else { 41 buf->next = buf + 1; 42 buf++; 43 } 44 } 45 } 46 47 rq->to_use = rq->to_clean = rq->bufs[0]; 48 rq->buf_index = 0; 49 50 return 0; 51 } 52 53 void 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 kfree(rq->bufs[i]); 64 rq->bufs[i] = NULL; 65 } 66 67 rq->ctrl = NULL; 68 } 69 70 int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index, 71 unsigned int desc_count, unsigned int desc_size) 72 { 73 int err; 74 75 rq->index = index; 76 rq->vdev = vdev; 77 78 rq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_RQ, index); 79 if (!rq->ctrl) { 80 printk(KERN_ERR "Failed to hook RQ[%d] resource\n", index); 81 return -EINVAL; 82 } 83 84 vnic_rq_disable(rq); 85 86 err = vnic_dev_alloc_desc_ring(vdev, &rq->ring, desc_count, desc_size); 87 if (err) 88 return err; 89 90 err = vnic_rq_alloc_bufs(rq); 91 if (err) { 92 vnic_rq_free(rq); 93 return err; 94 } 95 96 return 0; 97 } 98 99 void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index, 100 unsigned int error_interrupt_enable, 101 unsigned int error_interrupt_offset) 102 { 103 u64 paddr; 104 u32 fetch_index; 105 106 paddr = (u64)rq->ring.base_addr | VNIC_PADDR_TARGET; 107 writeq(paddr, &rq->ctrl->ring_base); 108 iowrite32(rq->ring.desc_count, &rq->ctrl->ring_size); 109 iowrite32(cq_index, &rq->ctrl->cq_index); 110 iowrite32(error_interrupt_enable, &rq->ctrl->error_interrupt_enable); 111 iowrite32(error_interrupt_offset, &rq->ctrl->error_interrupt_offset); 112 iowrite32(0, &rq->ctrl->dropped_packet_count); 113 iowrite32(0, &rq->ctrl->error_status); 114 115 /* Use current fetch_index as the ring starting point */ 116 fetch_index = ioread32(&rq->ctrl->fetch_index); 117 rq->to_use = rq->to_clean = 118 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES] 119 [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES]; 120 iowrite32(fetch_index, &rq->ctrl->posted_index); 121 122 rq->buf_index = 0; 123 } 124 125 unsigned int vnic_rq_error_status(struct vnic_rq *rq) 126 { 127 return ioread32(&rq->ctrl->error_status); 128 } 129 130 void vnic_rq_enable(struct vnic_rq *rq) 131 { 132 iowrite32(1, &rq->ctrl->enable); 133 } 134 135 int vnic_rq_disable(struct vnic_rq *rq) 136 { 137 unsigned int wait; 138 139 iowrite32(0, &rq->ctrl->enable); 140 141 /* Wait for HW to ACK disable request */ 142 for (wait = 0; wait < 100; wait++) { 143 if (!(ioread32(&rq->ctrl->running))) 144 return 0; 145 udelay(1); 146 } 147 148 printk(KERN_ERR "Failed to disable RQ[%d]\n", rq->index); 149 150 return -ETIMEDOUT; 151 } 152 153 void vnic_rq_clean(struct vnic_rq *rq, 154 void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf)) 155 { 156 struct vnic_rq_buf *buf; 157 u32 fetch_index; 158 159 WARN_ON(ioread32(&rq->ctrl->enable)); 160 161 buf = rq->to_clean; 162 163 while (vnic_rq_desc_used(rq) > 0) { 164 165 (*buf_clean)(rq, buf); 166 167 buf = rq->to_clean = buf->next; 168 rq->ring.desc_avail++; 169 } 170 171 /* Use current fetch_index as the ring starting point */ 172 fetch_index = ioread32(&rq->ctrl->fetch_index); 173 rq->to_use = rq->to_clean = 174 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES] 175 [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES]; 176 iowrite32(fetch_index, &rq->ctrl->posted_index); 177 178 rq->buf_index = 0; 179 180 vnic_dev_clear_desc_ring(&rq->ring); 181 } 182