include/net/xdp_sock_drv.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /* Interface for implementing AF_XDP zero-copy support in drivers.
   3  * Copyright(c) 2020 Intel Corporation.
   4  */
   5
   6 #ifndef _LINUX_XDP_SOCK_DRV_H
   7 #define _LINUX_XDP_SOCK_DRV_H
   8
   9 #include <net/xdp_sock.h>
  10 #include <net/xsk_buff_pool.h>
  11
  12 #define XDP_UMEM_MIN_CHUNK_SHIFT 11
  13 #define XDP_UMEM_MIN_CHUNK_SIZE (1 << XDP_UMEM_MIN_CHUNK_SHIFT)
  14
  15 struct xsk_cb_desc {
  16         void *src;
  17         u8 off;
  18         u8 bytes;
  19 };
  20
  21 #ifdef CONFIG_XDP_SOCKETS
  22
  23 void xsk_tx_completed(struct xsk_buff_pool *pool, u32 nb_entries);
  24 bool xsk_tx_peek_desc(struct xsk_buff_pool *pool, struct xdp_desc *desc);
  25 u32 xsk_tx_peek_release_desc_batch(struct xsk_buff_pool *pool, u32 max);
  26 void xsk_tx_release(struct xsk_buff_pool *pool);
  27 struct xsk_buff_pool *xsk_get_pool_from_qid(struct net_device *dev,
  28                                             u16 queue_id);
  29 void xsk_set_rx_need_wakeup(struct xsk_buff_pool *pool);
  30 void xsk_set_tx_need_wakeup(struct xsk_buff_pool *pool);
  31 void xsk_clear_rx_need_wakeup(struct xsk_buff_pool *pool);
  32 void xsk_clear_tx_need_wakeup(struct xsk_buff_pool *pool);
  33 bool xsk_uses_need_wakeup(struct xsk_buff_pool *pool);
  34
  35 static inline u32 xsk_pool_get_headroom(struct xsk_buff_pool *pool)
  36 {
  37         return XDP_PACKET_HEADROOM + pool->headroom;
  38 }
  39
  40 static inline u32 xsk_pool_get_chunk_size(struct xsk_buff_pool *pool)
  41 {
  42         return pool->chunk_size;
  43 }
  44
  45 static inline u32 xsk_pool_get_rx_frame_size(struct xsk_buff_pool *pool)
  46 {
  47         return xsk_pool_get_chunk_size(pool) - xsk_pool_get_headroom(pool);
  48 }
  49
  50 static inline void xsk_pool_set_rxq_info(struct xsk_buff_pool *pool,
  51                                          struct xdp_rxq_info *rxq)
  52 {
  53         xp_set_rxq_info(pool, rxq);
  54 }
  55
  56 static inline void xsk_pool_fill_cb(struct xsk_buff_pool *pool,
  57                                     struct xsk_cb_desc *desc)
  58 {
  59         xp_fill_cb(pool, desc);
  60 }
  61
  62 static inline unsigned int xsk_pool_get_napi_id(struct xsk_buff_pool *pool)
  63 {
  64 #ifdef CONFIG_NET_RX_BUSY_POLL
  65         return pool->heads[0].xdp.rxq->napi_id;
  66 #else
  67         return 0;
  68 #endif
  69 }
  70
  71 static inline void xsk_pool_dma_unmap(struct xsk_buff_pool *pool,
  72                                       unsigned long attrs)
  73 {
  74         xp_dma_unmap(pool, attrs);
  75 }
  76
  77 static inline int xsk_pool_dma_map(struct xsk_buff_pool *pool,
  78                                    struct device *dev, unsigned long attrs)
  79 {
  80         struct xdp_umem *umem = pool->umem;
  81
  82         return xp_dma_map(pool, dev, attrs, umem->pgs, umem->npgs);
  83 }
  84
  85 static inline dma_addr_t xsk_buff_xdp_get_dma(struct xdp_buff *xdp)
  86 {
  87         struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
  88
  89         return xp_get_dma(xskb);
  90 }
  91
  92 static inline dma_addr_t xsk_buff_xdp_get_frame_dma(struct xdp_buff *xdp)
  93 {
  94         struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
  95
  96         return xp_get_frame_dma(xskb);
  97 }
  98
  99 static inline struct xdp_buff *xsk_buff_alloc(struct xsk_buff_pool *pool)
 100 {
 101         return xp_alloc(pool);
 102 }
 103
 104 static inline bool xsk_is_eop_desc(struct xdp_desc *desc)
 105 {
 106         return !xp_mb_desc(desc);
 107 }
 108
 109 /* Returns as many entries as possible up to max. 0 <= N <= max. */
 110 static inline u32 xsk_buff_alloc_batch(struct xsk_buff_pool *pool, struct xdp_buff **xdp, u32 max)
 111 {
 112         return xp_alloc_batch(pool, xdp, max);
 113 }
 114
 115 static inline bool xsk_buff_can_alloc(struct xsk_buff_pool *pool, u32 count)
 116 {
 117         return xp_can_alloc(pool, count);
 118 }
 119
 120 static inline void xsk_buff_free(struct xdp_buff *xdp)
 121 {
 122         struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
 123         struct list_head *xskb_list = &xskb->pool->xskb_list;
 124         struct xdp_buff_xsk *pos, *tmp;
 125
 126         if (likely(!xdp_buff_has_frags(xdp)))
 127                 goto out;
 128
 129         list_for_each_entry_safe(pos, tmp, xskb_list, list_node) {
 130                 list_del(&pos->list_node);
 131                 xp_free(pos);
 132         }
 133
 134         xdp_get_shared_info_from_buff(xdp)->nr_frags = 0;
 135 out:
 136         xp_free(xskb);
 137 }
 138
 139 static inline void xsk_buff_add_frag(struct xdp_buff *xdp)
 140 {
 141         struct xdp_buff_xsk *frag = container_of(xdp, struct xdp_buff_xsk, xdp);
 142
 143         list_add_tail(&frag->list_node, &frag->pool->xskb_list);
 144 }
 145
 146 static inline struct xdp_buff *xsk_buff_get_frag(struct xdp_buff *first)
 147 {
 148         struct xdp_buff_xsk *xskb = container_of(first, struct xdp_buff_xsk, xdp);
 149         struct xdp_buff *ret = NULL;
 150         struct xdp_buff_xsk *frag;
 151
 152         frag = list_first_entry_or_null(&xskb->pool->xskb_list,
 153                                         struct xdp_buff_xsk, list_node);
 154         if (frag) {
 155                 list_del(&frag->list_node);
 156                 ret = &frag->xdp;
 157         }
 158
 159         return ret;
 160 }
 161
 162 static inline void xsk_buff_del_tail(struct xdp_buff *tail)
 163 {
 164         struct xdp_buff_xsk *xskb = container_of(tail, struct xdp_buff_xsk, xdp);
 165
 166         list_del(&xskb->list_node);
 167 }
 168
 169 static inline struct xdp_buff *xsk_buff_get_tail(struct xdp_buff *first)
 170 {
 171         struct xdp_buff_xsk *xskb = container_of(first, struct xdp_buff_xsk, xdp);
 172         struct xdp_buff_xsk *frag;
 173
 174         frag = list_last_entry(&xskb->pool->xskb_list, struct xdp_buff_xsk,
 175                                list_node);
 176         return &frag->xdp;
 177 }
 178
 179 static inline void xsk_buff_set_size(struct xdp_buff *xdp, u32 size)
 180 {
 181         xdp->data = xdp->data_hard_start + XDP_PACKET_HEADROOM;
 182         xdp->data_meta = xdp->data;
 183         xdp->data_end = xdp->data + size;
 184         xdp->flags = 0;
 185 }
 186
 187 static inline dma_addr_t xsk_buff_raw_get_dma(struct xsk_buff_pool *pool,
 188                                               u64 addr)
 189 {
 190         return xp_raw_get_dma(pool, addr);
 191 }
 192
 193 static inline void *xsk_buff_raw_get_data(struct xsk_buff_pool *pool, u64 addr)
 194 {
 195         return xp_raw_get_data(pool, addr);
 196 }
 197
 198 #define XDP_TXMD_FLAGS_VALID ( \
 199                 XDP_TXMD_FLAGS_TIMESTAMP | \
 200                 XDP_TXMD_FLAGS_CHECKSUM | \
 201         0)
 202
 203 static inline bool xsk_buff_valid_tx_metadata(struct xsk_tx_metadata *meta)
 204 {
 205         return !(meta->flags & ~XDP_TXMD_FLAGS_VALID);
 206 }
 207
 208 static inline struct xsk_tx_metadata *xsk_buff_get_metadata(struct xsk_buff_pool *pool, u64 addr)
 209 {
 210         struct xsk_tx_metadata *meta;
 211
 212         if (!pool->tx_metadata_len)
 213                 return NULL;
 214
 215         meta = xp_raw_get_data(pool, addr) - pool->tx_metadata_len;
 216         if (unlikely(!xsk_buff_valid_tx_metadata(meta)))
 217                 return NULL; /* no way to signal the error to the user */
 218
 219         return meta;
 220 }
 221
 222 static inline void xsk_buff_dma_sync_for_cpu(struct xdp_buff *xdp)
 223 {
 224         struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
 225
 226         xp_dma_sync_for_cpu(xskb);
 227 }
 228
 229 static inline void xsk_buff_raw_dma_sync_for_device(struct xsk_buff_pool *pool,
 230                                                     dma_addr_t dma,
 231                                                     size_t size)
 232 {
 233         xp_dma_sync_for_device(pool, dma, size);
 234 }
 235
 236 #else
 237
 238 static inline void xsk_tx_completed(struct xsk_buff_pool *pool, u32 nb_entries)
 239 {
 240 }
 241
 242 static inline bool xsk_tx_peek_desc(struct xsk_buff_pool *pool,
 243                                     struct xdp_desc *desc)
 244 {
 245         return false;
 246 }
 247
 248 static inline u32 xsk_tx_peek_release_desc_batch(struct xsk_buff_pool *pool, u32 max)
 249 {
 250         return 0;
 251 }
 252
 253 static inline void xsk_tx_release(struct xsk_buff_pool *pool)
 254 {
 255 }
 256
 257 static inline struct xsk_buff_pool *
 258 xsk_get_pool_from_qid(struct net_device *dev, u16 queue_id)
 259 {
 260         return NULL;
 261 }
 262
 263 static inline void xsk_set_rx_need_wakeup(struct xsk_buff_pool *pool)
 264 {
 265 }
 266
 267 static inline void xsk_set_tx_need_wakeup(struct xsk_buff_pool *pool)
 268 {
 269 }
 270
 271 static inline void xsk_clear_rx_need_wakeup(struct xsk_buff_pool *pool)
 272 {
 273 }
 274
 275 static inline void xsk_clear_tx_need_wakeup(struct xsk_buff_pool *pool)
 276 {
 277 }
 278
 279 static inline bool xsk_uses_need_wakeup(struct xsk_buff_pool *pool)
 280 {
 281         return false;
 282 }
 283
 284 static inline u32 xsk_pool_get_headroom(struct xsk_buff_pool *pool)
 285 {
 286         return 0;
 287 }
 288
 289 static inline u32 xsk_pool_get_chunk_size(struct xsk_buff_pool *pool)
 290 {
 291         return 0;
 292 }
 293
 294 static inline u32 xsk_pool_get_rx_frame_size(struct xsk_buff_pool *pool)
 295 {
 296         return 0;
 297 }
 298
 299 static inline void xsk_pool_set_rxq_info(struct xsk_buff_pool *pool,
 300                                          struct xdp_rxq_info *rxq)
 301 {
 302 }
 303
 304 static inline void xsk_pool_fill_cb(struct xsk_buff_pool *pool,
 305                                     struct xsk_cb_desc *desc)
 306 {
 307 }
 308
 309 static inline unsigned int xsk_pool_get_napi_id(struct xsk_buff_pool *pool)
 310 {
 311         return 0;
 312 }
 313
 314 static inline void xsk_pool_dma_unmap(struct xsk_buff_pool *pool,
 315                                       unsigned long attrs)
 316 {
 317 }
 318
 319 static inline int xsk_pool_dma_map(struct xsk_buff_pool *pool,
 320                                    struct device *dev, unsigned long attrs)
 321 {
 322         return 0;
 323 }
 324
 325 static inline dma_addr_t xsk_buff_xdp_get_dma(struct xdp_buff *xdp)
 326 {
 327         return 0;
 328 }
 329
 330 static inline dma_addr_t xsk_buff_xdp_get_frame_dma(struct xdp_buff *xdp)
 331 {
 332         return 0;
 333 }
 334
 335 static inline struct xdp_buff *xsk_buff_alloc(struct xsk_buff_pool *pool)
 336 {
 337         return NULL;
 338 }
 339
 340 static inline bool xsk_is_eop_desc(struct xdp_desc *desc)
 341 {
 342         return false;
 343 }
 344
 345 static inline u32 xsk_buff_alloc_batch(struct xsk_buff_pool *pool, struct xdp_buff **xdp, u32 max)
 346 {
 347         return 0;
 348 }
 349
 350 static inline bool xsk_buff_can_alloc(struct xsk_buff_pool *pool, u32 count)
 351 {
 352         return false;
 353 }
 354
 355 static inline void xsk_buff_free(struct xdp_buff *xdp)
 356 {
 357 }
 358
 359 static inline void xsk_buff_add_frag(struct xdp_buff *xdp)
 360 {
 361 }
 362
 363 static inline struct xdp_buff *xsk_buff_get_frag(struct xdp_buff *first)
 364 {
 365         return NULL;
 366 }
 367
 368 static inline void xsk_buff_del_tail(struct xdp_buff *tail)
 369 {
 370 }
 371
 372 static inline struct xdp_buff *xsk_buff_get_tail(struct xdp_buff *first)
 373 {
 374         return NULL;
 375 }
 376
 377 static inline void xsk_buff_set_size(struct xdp_buff *xdp, u32 size)
 378 {
 379 }
 380
 381 static inline dma_addr_t xsk_buff_raw_get_dma(struct xsk_buff_pool *pool,
 382                                               u64 addr)
 383 {
 384         return 0;
 385 }
 386
 387 static inline void *xsk_buff_raw_get_data(struct xsk_buff_pool *pool, u64 addr)
 388 {
 389         return NULL;
 390 }
 391
 392 static inline bool xsk_buff_valid_tx_metadata(struct xsk_tx_metadata *meta)
 393 {
 394         return false;
 395 }
 396
 397 static inline struct xsk_tx_metadata *xsk_buff_get_metadata(struct xsk_buff_pool *pool, u64 addr)
 398 {
 399         return NULL;
 400 }
 401
 402 static inline void xsk_buff_dma_sync_for_cpu(struct xdp_buff *xdp)
 403 {
 404 }
 405
 406 static inline void xsk_buff_raw_dma_sync_for_device(struct xsk_buff_pool *pool,
 407                                                     dma_addr_t dma,
 408                                                     size_t size)
 409 {
 410 }
 411
 412 #endif /* CONFIG_XDP_SOCKETS */
 413
 414 #endif /* _LINUX_XDP_SOCK_DRV_H */