1 /* 2 * aQuantia Corporation Network Driver 3 * Copyright (C) 2014-2017 aQuantia Corporation. All rights reserved 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms and conditions of the GNU General Public License, 7 * version 2, as published by the Free Software Foundation. 8 */ 9 10 /* File aq_ring.c: Definition of functions for Rx/Tx rings. */ 11 12 #include "aq_ring.h" 13 #include "aq_nic.h" 14 #include "aq_hw.h" 15 16 #include <linux/netdevice.h> 17 #include <linux/etherdevice.h> 18 19 static struct aq_ring_s *aq_ring_alloc(struct aq_ring_s *self, 20 struct aq_nic_s *aq_nic) 21 { 22 int err = 0; 23 24 self->buff_ring = 25 kcalloc(self->size, sizeof(struct aq_ring_buff_s), GFP_KERNEL); 26 27 if (!self->buff_ring) { 28 err = -ENOMEM; 29 goto err_exit; 30 } 31 self->dx_ring = dma_alloc_coherent(aq_nic_get_dev(aq_nic), 32 self->size * self->dx_size, 33 &self->dx_ring_pa, GFP_KERNEL); 34 if (!self->dx_ring) { 35 err = -ENOMEM; 36 goto err_exit; 37 } 38 39 err_exit: 40 if (err < 0) { 41 aq_ring_free(self); 42 self = NULL; 43 } 44 return self; 45 } 46 47 struct aq_ring_s *aq_ring_tx_alloc(struct aq_ring_s *self, 48 struct aq_nic_s *aq_nic, 49 unsigned int idx, 50 struct aq_nic_cfg_s *aq_nic_cfg) 51 { 52 int err = 0; 53 54 self->aq_nic = aq_nic; 55 self->idx = idx; 56 self->size = aq_nic_cfg->txds; 57 self->dx_size = aq_nic_cfg->aq_hw_caps->txd_size; 58 59 self = aq_ring_alloc(self, aq_nic); 60 if (!self) { 61 err = -ENOMEM; 62 goto err_exit; 63 } 64 65 err_exit: 66 if (err < 0) { 67 aq_ring_free(self); 68 self = NULL; 69 } 70 return self; 71 } 72 73 struct aq_ring_s *aq_ring_rx_alloc(struct aq_ring_s *self, 74 struct aq_nic_s *aq_nic, 75 unsigned int idx, 76 struct aq_nic_cfg_s *aq_nic_cfg) 77 { 78 int err = 0; 79 80 self->aq_nic = aq_nic; 81 self->idx = idx; 82 self->size = aq_nic_cfg->rxds; 83 self->dx_size = aq_nic_cfg->aq_hw_caps->rxd_size; 84 85 self = aq_ring_alloc(self, aq_nic); 86 if (!self) { 87 err = -ENOMEM; 88 goto err_exit; 89 } 90 91 err_exit: 92 if (err < 0) { 93 aq_ring_free(self); 94 self = NULL; 95 } 96 return self; 97 } 98 99 int aq_ring_init(struct aq_ring_s *self) 100 { 101 self->hw_head = 0; 102 self->sw_head = 0; 103 self->sw_tail = 0; 104 return 0; 105 } 106 107 void aq_ring_tx_clean(struct aq_ring_s *self) 108 { 109 struct device *dev = aq_nic_get_dev(self->aq_nic); 110 111 for (; self->sw_head != self->hw_head; 112 self->sw_head = aq_ring_next_dx(self, self->sw_head)) { 113 struct aq_ring_buff_s *buff = &self->buff_ring[self->sw_head]; 114 115 if (likely(buff->is_mapped)) { 116 if (unlikely(buff->is_sop)) 117 dma_unmap_single(dev, buff->pa, buff->len, 118 DMA_TO_DEVICE); 119 else 120 dma_unmap_page(dev, buff->pa, buff->len, 121 DMA_TO_DEVICE); 122 } 123 124 if (unlikely(buff->is_eop)) 125 dev_kfree_skb_any(buff->skb); 126 } 127 } 128 129 static inline unsigned int aq_ring_dx_in_range(unsigned int h, unsigned int i, 130 unsigned int t) 131 { 132 return (h < t) ? ((h < i) && (i < t)) : ((h < i) || (i < t)); 133 } 134 135 #define AQ_SKB_ALIGN SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) 136 int aq_ring_rx_clean(struct aq_ring_s *self, 137 struct napi_struct *napi, 138 int *work_done, 139 int budget) 140 { 141 struct net_device *ndev = aq_nic_get_ndev(self->aq_nic); 142 int err = 0; 143 bool is_rsc_completed = true; 144 145 for (; (self->sw_head != self->hw_head) && budget; 146 self->sw_head = aq_ring_next_dx(self, self->sw_head), 147 --budget, ++(*work_done)) { 148 struct aq_ring_buff_s *buff = &self->buff_ring[self->sw_head]; 149 struct sk_buff *skb = NULL; 150 unsigned int next_ = 0U; 151 unsigned int i = 0U; 152 struct aq_ring_buff_s *buff_ = NULL; 153 154 if (buff->is_error) { 155 __free_pages(buff->page, 0); 156 continue; 157 } 158 159 if (buff->is_cleaned) 160 continue; 161 162 if (!buff->is_eop) { 163 for (next_ = buff->next, 164 buff_ = &self->buff_ring[next_]; true; 165 next_ = buff_->next, 166 buff_ = &self->buff_ring[next_]) { 167 is_rsc_completed = 168 aq_ring_dx_in_range(self->sw_head, 169 next_, 170 self->hw_head); 171 172 if (unlikely(!is_rsc_completed)) { 173 is_rsc_completed = false; 174 break; 175 } 176 177 if (buff_->is_eop) 178 break; 179 } 180 181 if (!is_rsc_completed) { 182 err = 0; 183 goto err_exit; 184 } 185 } 186 187 /* for single fragment packets use build_skb() */ 188 if (buff->is_eop) { 189 skb = build_skb(page_address(buff->page), 190 buff->len + AQ_SKB_ALIGN); 191 if (unlikely(!skb)) { 192 err = -ENOMEM; 193 goto err_exit; 194 } 195 196 skb_put(skb, buff->len); 197 } else { 198 skb = netdev_alloc_skb(ndev, ETH_HLEN); 199 if (unlikely(!skb)) { 200 err = -ENOMEM; 201 goto err_exit; 202 } 203 skb_put(skb, ETH_HLEN); 204 memcpy(skb->data, page_address(buff->page), ETH_HLEN); 205 206 skb_add_rx_frag(skb, 0, buff->page, ETH_HLEN, 207 buff->len - ETH_HLEN, 208 SKB_TRUESIZE(buff->len - ETH_HLEN)); 209 210 for (i = 1U, next_ = buff->next, 211 buff_ = &self->buff_ring[next_]; true; 212 next_ = buff_->next, 213 buff_ = &self->buff_ring[next_], ++i) { 214 skb_add_rx_frag(skb, i, buff_->page, 0, 215 buff_->len, 216 SKB_TRUESIZE(buff->len - 217 ETH_HLEN)); 218 buff_->is_cleaned = 1; 219 220 if (buff_->is_eop) 221 break; 222 } 223 } 224 225 skb->protocol = eth_type_trans(skb, ndev); 226 if (unlikely(buff->is_cso_err)) { 227 ++self->stats.rx.errors; 228 skb->ip_summed = CHECKSUM_NONE; 229 } else { 230 if (buff->is_ip_cso) { 231 __skb_incr_checksum_unnecessary(skb); 232 if (buff->is_udp_cso || buff->is_tcp_cso) 233 __skb_incr_checksum_unnecessary(skb); 234 } else { 235 skb->ip_summed = CHECKSUM_NONE; 236 } 237 } 238 239 skb_set_hash(skb, buff->rss_hash, 240 buff->is_hash_l4 ? PKT_HASH_TYPE_L4 : 241 PKT_HASH_TYPE_NONE); 242 243 skb_record_rx_queue(skb, self->idx); 244 245 napi_gro_receive(napi, skb); 246 247 ++self->stats.rx.packets; 248 self->stats.rx.bytes += skb->len; 249 } 250 251 err_exit: 252 return err; 253 } 254 255 int aq_ring_rx_fill(struct aq_ring_s *self) 256 { 257 unsigned int pages_order = fls(AQ_CFG_RX_FRAME_MAX / PAGE_SIZE + 258 (AQ_CFG_RX_FRAME_MAX % PAGE_SIZE ? 1 : 0)) - 1; 259 struct aq_ring_buff_s *buff = NULL; 260 int err = 0; 261 int i = 0; 262 263 for (i = aq_ring_avail_dx(self); i--; 264 self->sw_tail = aq_ring_next_dx(self, self->sw_tail)) { 265 buff = &self->buff_ring[self->sw_tail]; 266 267 buff->flags = 0U; 268 buff->len = AQ_CFG_RX_FRAME_MAX; 269 270 buff->page = alloc_pages(GFP_ATOMIC | __GFP_COLD | 271 __GFP_COMP, pages_order); 272 if (!buff->page) { 273 err = -ENOMEM; 274 goto err_exit; 275 } 276 277 buff->pa = dma_map_page(aq_nic_get_dev(self->aq_nic), 278 buff->page, 0, 279 AQ_CFG_RX_FRAME_MAX, DMA_FROM_DEVICE); 280 281 if (dma_mapping_error(aq_nic_get_dev(self->aq_nic), buff->pa)) { 282 err = -ENOMEM; 283 goto err_exit; 284 } 285 286 buff = NULL; 287 } 288 289 err_exit: 290 if (err < 0) { 291 if (buff && buff->page) 292 __free_pages(buff->page, 0); 293 } 294 295 return err; 296 } 297 298 void aq_ring_rx_deinit(struct aq_ring_s *self) 299 { 300 if (!self) 301 goto err_exit; 302 303 for (; self->sw_head != self->sw_tail; 304 self->sw_head = aq_ring_next_dx(self, self->sw_head)) { 305 struct aq_ring_buff_s *buff = &self->buff_ring[self->sw_head]; 306 307 dma_unmap_page(aq_nic_get_dev(self->aq_nic), buff->pa, 308 AQ_CFG_RX_FRAME_MAX, DMA_FROM_DEVICE); 309 310 __free_pages(buff->page, 0); 311 } 312 313 err_exit:; 314 } 315 316 void aq_ring_free(struct aq_ring_s *self) 317 { 318 if (!self) 319 goto err_exit; 320 321 kfree(self->buff_ring); 322 323 if (self->dx_ring) 324 dma_free_coherent(aq_nic_get_dev(self->aq_nic), 325 self->size * self->dx_size, self->dx_ring, 326 self->dx_ring_pa); 327 328 err_exit:; 329 } 330