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 spin_lock_init(&self->header.lock); 105 return 0; 106 } 107 108 void aq_ring_tx_clean(struct aq_ring_s *self) 109 { 110 struct device *dev = aq_nic_get_dev(self->aq_nic); 111 112 for (; self->sw_head != self->hw_head; 113 self->sw_head = aq_ring_next_dx(self, self->sw_head)) { 114 struct aq_ring_buff_s *buff = &self->buff_ring[self->sw_head]; 115 116 if (likely(buff->is_mapped)) { 117 if (unlikely(buff->is_sop)) 118 dma_unmap_single(dev, buff->pa, buff->len, 119 DMA_TO_DEVICE); 120 else 121 dma_unmap_page(dev, buff->pa, buff->len, 122 DMA_TO_DEVICE); 123 } 124 125 if (unlikely(buff->is_eop)) 126 dev_kfree_skb_any(buff->skb); 127 } 128 } 129 130 static inline unsigned int aq_ring_dx_in_range(unsigned int h, unsigned int i, 131 unsigned int t) 132 { 133 return (h < t) ? ((h < i) && (i < t)) : ((h < i) || (i < t)); 134 } 135 136 #define AQ_SKB_ALIGN SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) 137 int aq_ring_rx_clean(struct aq_ring_s *self, int *work_done, int budget) 138 { 139 struct net_device *ndev = aq_nic_get_ndev(self->aq_nic); 140 int err = 0; 141 bool is_rsc_completed = true; 142 143 for (; (self->sw_head != self->hw_head) && budget; 144 self->sw_head = aq_ring_next_dx(self, self->sw_head), 145 --budget, ++(*work_done)) { 146 struct aq_ring_buff_s *buff = &self->buff_ring[self->sw_head]; 147 struct sk_buff *skb = NULL; 148 unsigned int next_ = 0U; 149 unsigned int i = 0U; 150 struct aq_ring_buff_s *buff_ = NULL; 151 152 if (buff->is_error) { 153 __free_pages(buff->page, 0); 154 continue; 155 } 156 157 if (buff->is_cleaned) 158 continue; 159 160 if (!buff->is_eop) { 161 for (next_ = buff->next, 162 buff_ = &self->buff_ring[next_]; true; 163 next_ = buff_->next, 164 buff_ = &self->buff_ring[next_]) { 165 is_rsc_completed = 166 aq_ring_dx_in_range(self->sw_head, 167 next_, 168 self->hw_head); 169 170 if (unlikely(!is_rsc_completed)) { 171 is_rsc_completed = false; 172 break; 173 } 174 175 if (buff_->is_eop) 176 break; 177 } 178 179 if (!is_rsc_completed) { 180 err = 0; 181 goto err_exit; 182 } 183 } 184 185 /* for single fragment packets use build_skb() */ 186 if (buff->is_eop) { 187 skb = build_skb(page_address(buff->page), 188 buff->len + AQ_SKB_ALIGN); 189 if (unlikely(!skb)) { 190 err = -ENOMEM; 191 goto err_exit; 192 } 193 194 skb_put(skb, buff->len); 195 } else { 196 skb = netdev_alloc_skb(ndev, ETH_HLEN); 197 if (unlikely(!skb)) { 198 err = -ENOMEM; 199 goto err_exit; 200 } 201 skb_put(skb, ETH_HLEN); 202 memcpy(skb->data, page_address(buff->page), ETH_HLEN); 203 204 skb_add_rx_frag(skb, 0, buff->page, ETH_HLEN, 205 buff->len - ETH_HLEN, 206 SKB_TRUESIZE(buff->len - ETH_HLEN)); 207 208 for (i = 1U, next_ = buff->next, 209 buff_ = &self->buff_ring[next_]; true; 210 next_ = buff_->next, 211 buff_ = &self->buff_ring[next_], ++i) { 212 skb_add_rx_frag(skb, i, buff_->page, 0, 213 buff_->len, 214 SKB_TRUESIZE(buff->len - 215 ETH_HLEN)); 216 buff_->is_cleaned = 1; 217 218 if (buff_->is_eop) 219 break; 220 } 221 } 222 223 skb->protocol = eth_type_trans(skb, ndev); 224 if (unlikely(buff->is_cso_err)) { 225 ++self->stats.rx.errors; 226 __skb_mark_checksum_bad(skb); 227 } else { 228 if (buff->is_ip_cso) { 229 __skb_incr_checksum_unnecessary(skb); 230 if (buff->is_udp_cso || buff->is_tcp_cso) 231 __skb_incr_checksum_unnecessary(skb); 232 } else { 233 skb->ip_summed = CHECKSUM_NONE; 234 } 235 } 236 237 skb_set_hash(skb, buff->rss_hash, 238 buff->is_hash_l4 ? PKT_HASH_TYPE_L4 : 239 PKT_HASH_TYPE_NONE); 240 241 skb_record_rx_queue(skb, self->idx); 242 243 netif_receive_skb(skb); 244 245 ++self->stats.rx.packets; 246 self->stats.rx.bytes += skb->len; 247 } 248 249 err_exit: 250 return err; 251 } 252 253 int aq_ring_rx_fill(struct aq_ring_s *self) 254 { 255 unsigned int pages_order = fls(AQ_CFG_RX_FRAME_MAX / PAGE_SIZE + 256 (AQ_CFG_RX_FRAME_MAX % PAGE_SIZE ? 1 : 0)) - 1; 257 struct aq_ring_buff_s *buff = NULL; 258 int err = 0; 259 int i = 0; 260 261 for (i = aq_ring_avail_dx(self); i--; 262 self->sw_tail = aq_ring_next_dx(self, self->sw_tail)) { 263 buff = &self->buff_ring[self->sw_tail]; 264 265 buff->flags = 0U; 266 buff->len = AQ_CFG_RX_FRAME_MAX; 267 268 buff->page = alloc_pages(GFP_ATOMIC | __GFP_COLD | 269 __GFP_COMP, pages_order); 270 if (!buff->page) { 271 err = -ENOMEM; 272 goto err_exit; 273 } 274 275 buff->pa = dma_map_page(aq_nic_get_dev(self->aq_nic), 276 buff->page, 0, 277 AQ_CFG_RX_FRAME_MAX, DMA_FROM_DEVICE); 278 279 if (dma_mapping_error(aq_nic_get_dev(self->aq_nic), buff->pa)) { 280 err = -ENOMEM; 281 goto err_exit; 282 } 283 284 buff = NULL; 285 } 286 287 err_exit: 288 if (err < 0) { 289 if (buff && buff->page) 290 __free_pages(buff->page, 0); 291 } 292 293 return err; 294 } 295 296 void aq_ring_rx_deinit(struct aq_ring_s *self) 297 { 298 if (!self) 299 goto err_exit; 300 301 for (; self->sw_head != self->sw_tail; 302 self->sw_head = aq_ring_next_dx(self, self->sw_head)) { 303 struct aq_ring_buff_s *buff = &self->buff_ring[self->sw_head]; 304 305 dma_unmap_page(aq_nic_get_dev(self->aq_nic), buff->pa, 306 AQ_CFG_RX_FRAME_MAX, DMA_FROM_DEVICE); 307 308 __free_pages(buff->page, 0); 309 } 310 311 err_exit:; 312 } 313 314 void aq_ring_free(struct aq_ring_s *self) 315 { 316 if (!self) 317 goto err_exit; 318 319 kfree(self->buff_ring); 320 321 if (self->dx_ring) 322 dma_free_coherent(aq_nic_get_dev(self->aq_nic), 323 self->size * self->dx_size, self->dx_ring, 324 self->dx_ring_pa); 325 326 err_exit:; 327 } 328