1 // SPDX-License-Identifier: GPL-2.0 2 /* XDP sockets 3 * 4 * AF_XDP sockets allows a channel between XDP programs and userspace 5 * applications. 6 * Copyright(c) 2018 Intel Corporation. 7 * 8 * Author(s): Björn Töpel <bjorn.topel@intel.com> 9 * Magnus Karlsson <magnus.karlsson@intel.com> 10 */ 11 12 #define pr_fmt(fmt) "AF_XDP: %s: " fmt, __func__ 13 14 #include <linux/if_xdp.h> 15 #include <linux/init.h> 16 #include <linux/sched/mm.h> 17 #include <linux/sched/signal.h> 18 #include <linux/sched/task.h> 19 #include <linux/socket.h> 20 #include <linux/file.h> 21 #include <linux/uaccess.h> 22 #include <linux/net.h> 23 #include <linux/netdevice.h> 24 #include <linux/rculist.h> 25 #include <net/xdp_sock.h> 26 #include <net/xdp.h> 27 28 #include "xsk_queue.h" 29 #include "xdp_umem.h" 30 31 #define TX_BATCH_SIZE 16 32 33 static struct xdp_sock *xdp_sk(struct sock *sk) 34 { 35 return (struct xdp_sock *)sk; 36 } 37 38 bool xsk_is_setup_for_bpf_map(struct xdp_sock *xs) 39 { 40 return READ_ONCE(xs->rx) && READ_ONCE(xs->umem) && 41 READ_ONCE(xs->umem->fq); 42 } 43 44 u64 *xsk_umem_peek_addr(struct xdp_umem *umem, u64 *addr) 45 { 46 return xskq_peek_addr(umem->fq, addr); 47 } 48 EXPORT_SYMBOL(xsk_umem_peek_addr); 49 50 void xsk_umem_discard_addr(struct xdp_umem *umem) 51 { 52 xskq_discard_addr(umem->fq); 53 } 54 EXPORT_SYMBOL(xsk_umem_discard_addr); 55 56 static int __xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len) 57 { 58 void *to_buf, *from_buf; 59 u32 metalen; 60 u64 addr; 61 int err; 62 63 if (!xskq_peek_addr(xs->umem->fq, &addr) || 64 len > xs->umem->chunk_size_nohr - XDP_PACKET_HEADROOM) { 65 xs->rx_dropped++; 66 return -ENOSPC; 67 } 68 69 addr += xs->umem->headroom; 70 71 if (unlikely(xdp_data_meta_unsupported(xdp))) { 72 from_buf = xdp->data; 73 metalen = 0; 74 } else { 75 from_buf = xdp->data_meta; 76 metalen = xdp->data - xdp->data_meta; 77 } 78 79 to_buf = xdp_umem_get_data(xs->umem, addr); 80 memcpy(to_buf, from_buf, len + metalen); 81 addr += metalen; 82 err = xskq_produce_batch_desc(xs->rx, addr, len); 83 if (!err) { 84 xskq_discard_addr(xs->umem->fq); 85 xdp_return_buff(xdp); 86 return 0; 87 } 88 89 xs->rx_dropped++; 90 return err; 91 } 92 93 static int __xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len) 94 { 95 int err = xskq_produce_batch_desc(xs->rx, (u64)xdp->handle, len); 96 97 if (err) 98 xs->rx_dropped++; 99 100 return err; 101 } 102 103 int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) 104 { 105 u32 len; 106 107 if (xs->dev != xdp->rxq->dev || xs->queue_id != xdp->rxq->queue_index) 108 return -EINVAL; 109 110 len = xdp->data_end - xdp->data; 111 112 return (xdp->rxq->mem.type == MEM_TYPE_ZERO_COPY) ? 113 __xsk_rcv_zc(xs, xdp, len) : __xsk_rcv(xs, xdp, len); 114 } 115 116 void xsk_flush(struct xdp_sock *xs) 117 { 118 xskq_produce_flush_desc(xs->rx); 119 xs->sk.sk_data_ready(&xs->sk); 120 } 121 122 int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) 123 { 124 u32 metalen = xdp->data - xdp->data_meta; 125 u32 len = xdp->data_end - xdp->data; 126 void *buffer; 127 u64 addr; 128 int err; 129 130 if (xs->dev != xdp->rxq->dev || xs->queue_id != xdp->rxq->queue_index) 131 return -EINVAL; 132 133 if (!xskq_peek_addr(xs->umem->fq, &addr) || 134 len > xs->umem->chunk_size_nohr - XDP_PACKET_HEADROOM) { 135 xs->rx_dropped++; 136 return -ENOSPC; 137 } 138 139 addr += xs->umem->headroom; 140 141 buffer = xdp_umem_get_data(xs->umem, addr); 142 memcpy(buffer, xdp->data_meta, len + metalen); 143 addr += metalen; 144 err = xskq_produce_batch_desc(xs->rx, addr, len); 145 if (!err) { 146 xskq_discard_addr(xs->umem->fq); 147 xsk_flush(xs); 148 return 0; 149 } 150 151 xs->rx_dropped++; 152 return err; 153 } 154 155 void xsk_umem_complete_tx(struct xdp_umem *umem, u32 nb_entries) 156 { 157 xskq_produce_flush_addr_n(umem->cq, nb_entries); 158 } 159 EXPORT_SYMBOL(xsk_umem_complete_tx); 160 161 void xsk_umem_consume_tx_done(struct xdp_umem *umem) 162 { 163 struct xdp_sock *xs; 164 165 rcu_read_lock(); 166 list_for_each_entry_rcu(xs, &umem->xsk_list, list) { 167 xs->sk.sk_write_space(&xs->sk); 168 } 169 rcu_read_unlock(); 170 } 171 EXPORT_SYMBOL(xsk_umem_consume_tx_done); 172 173 bool xsk_umem_consume_tx(struct xdp_umem *umem, dma_addr_t *dma, u32 *len) 174 { 175 struct xdp_desc desc; 176 struct xdp_sock *xs; 177 178 rcu_read_lock(); 179 list_for_each_entry_rcu(xs, &umem->xsk_list, list) { 180 if (!xskq_peek_desc(xs->tx, &desc)) 181 continue; 182 183 if (xskq_produce_addr_lazy(umem->cq, desc.addr)) 184 goto out; 185 186 *dma = xdp_umem_get_dma(umem, desc.addr); 187 *len = desc.len; 188 189 xskq_discard_desc(xs->tx); 190 rcu_read_unlock(); 191 return true; 192 } 193 194 out: 195 rcu_read_unlock(); 196 return false; 197 } 198 EXPORT_SYMBOL(xsk_umem_consume_tx); 199 200 static int xsk_zc_xmit(struct sock *sk) 201 { 202 struct xdp_sock *xs = xdp_sk(sk); 203 struct net_device *dev = xs->dev; 204 205 return dev->netdev_ops->ndo_xsk_async_xmit(dev, xs->queue_id); 206 } 207 208 static void xsk_destruct_skb(struct sk_buff *skb) 209 { 210 u64 addr = (u64)(long)skb_shinfo(skb)->destructor_arg; 211 struct xdp_sock *xs = xdp_sk(skb->sk); 212 unsigned long flags; 213 214 spin_lock_irqsave(&xs->tx_completion_lock, flags); 215 WARN_ON_ONCE(xskq_produce_addr(xs->umem->cq, addr)); 216 spin_unlock_irqrestore(&xs->tx_completion_lock, flags); 217 218 sock_wfree(skb); 219 } 220 221 static int xsk_generic_xmit(struct sock *sk, struct msghdr *m, 222 size_t total_len) 223 { 224 u32 max_batch = TX_BATCH_SIZE; 225 struct xdp_sock *xs = xdp_sk(sk); 226 bool sent_frame = false; 227 struct xdp_desc desc; 228 struct sk_buff *skb; 229 int err = 0; 230 231 mutex_lock(&xs->mutex); 232 233 while (xskq_peek_desc(xs->tx, &desc)) { 234 char *buffer; 235 u64 addr; 236 u32 len; 237 238 if (max_batch-- == 0) { 239 err = -EAGAIN; 240 goto out; 241 } 242 243 if (xskq_reserve_addr(xs->umem->cq)) 244 goto out; 245 246 if (xs->queue_id >= xs->dev->real_num_tx_queues) 247 goto out; 248 249 len = desc.len; 250 skb = sock_alloc_send_skb(sk, len, 1, &err); 251 if (unlikely(!skb)) { 252 err = -EAGAIN; 253 goto out; 254 } 255 256 skb_put(skb, len); 257 addr = desc.addr; 258 buffer = xdp_umem_get_data(xs->umem, addr); 259 err = skb_store_bits(skb, 0, buffer, len); 260 if (unlikely(err)) { 261 kfree_skb(skb); 262 goto out; 263 } 264 265 skb->dev = xs->dev; 266 skb->priority = sk->sk_priority; 267 skb->mark = sk->sk_mark; 268 skb_shinfo(skb)->destructor_arg = (void *)(long)addr; 269 skb->destructor = xsk_destruct_skb; 270 271 err = dev_direct_xmit(skb, xs->queue_id); 272 xskq_discard_desc(xs->tx); 273 /* Ignore NET_XMIT_CN as packet might have been sent */ 274 if (err == NET_XMIT_DROP || err == NETDEV_TX_BUSY) { 275 /* SKB completed but not sent */ 276 err = -EBUSY; 277 goto out; 278 } 279 280 sent_frame = true; 281 } 282 283 out: 284 if (sent_frame) 285 sk->sk_write_space(sk); 286 287 mutex_unlock(&xs->mutex); 288 return err; 289 } 290 291 static int xsk_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) 292 { 293 bool need_wait = !(m->msg_flags & MSG_DONTWAIT); 294 struct sock *sk = sock->sk; 295 struct xdp_sock *xs = xdp_sk(sk); 296 297 if (unlikely(!xs->dev)) 298 return -ENXIO; 299 if (unlikely(!(xs->dev->flags & IFF_UP))) 300 return -ENETDOWN; 301 if (unlikely(!xs->tx)) 302 return -ENOBUFS; 303 if (need_wait) 304 return -EOPNOTSUPP; 305 306 return (xs->zc) ? xsk_zc_xmit(sk) : xsk_generic_xmit(sk, m, total_len); 307 } 308 309 static unsigned int xsk_poll(struct file *file, struct socket *sock, 310 struct poll_table_struct *wait) 311 { 312 unsigned int mask = datagram_poll(file, sock, wait); 313 struct sock *sk = sock->sk; 314 struct xdp_sock *xs = xdp_sk(sk); 315 316 if (xs->rx && !xskq_empty_desc(xs->rx)) 317 mask |= POLLIN | POLLRDNORM; 318 if (xs->tx && !xskq_full_desc(xs->tx)) 319 mask |= POLLOUT | POLLWRNORM; 320 321 return mask; 322 } 323 324 static int xsk_init_queue(u32 entries, struct xsk_queue **queue, 325 bool umem_queue) 326 { 327 struct xsk_queue *q; 328 329 if (entries == 0 || *queue || !is_power_of_2(entries)) 330 return -EINVAL; 331 332 q = xskq_create(entries, umem_queue); 333 if (!q) 334 return -ENOMEM; 335 336 /* Make sure queue is ready before it can be seen by others */ 337 smp_wmb(); 338 *queue = q; 339 return 0; 340 } 341 342 static int xsk_release(struct socket *sock) 343 { 344 struct sock *sk = sock->sk; 345 struct xdp_sock *xs = xdp_sk(sk); 346 struct net *net; 347 348 if (!sk) 349 return 0; 350 351 net = sock_net(sk); 352 353 local_bh_disable(); 354 sock_prot_inuse_add(net, sk->sk_prot, -1); 355 local_bh_enable(); 356 357 if (xs->dev) { 358 struct net_device *dev = xs->dev; 359 360 /* Wait for driver to stop using the xdp socket. */ 361 xdp_del_sk_umem(xs->umem, xs); 362 xs->dev = NULL; 363 synchronize_net(); 364 dev_put(dev); 365 } 366 367 xskq_destroy(xs->rx); 368 xskq_destroy(xs->tx); 369 xdp_put_umem(xs->umem); 370 371 sock_orphan(sk); 372 sock->sk = NULL; 373 374 sk_refcnt_debug_release(sk); 375 sock_put(sk); 376 377 return 0; 378 } 379 380 static struct socket *xsk_lookup_xsk_from_fd(int fd) 381 { 382 struct socket *sock; 383 int err; 384 385 sock = sockfd_lookup(fd, &err); 386 if (!sock) 387 return ERR_PTR(-ENOTSOCK); 388 389 if (sock->sk->sk_family != PF_XDP) { 390 sockfd_put(sock); 391 return ERR_PTR(-ENOPROTOOPT); 392 } 393 394 return sock; 395 } 396 397 static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len) 398 { 399 struct sockaddr_xdp *sxdp = (struct sockaddr_xdp *)addr; 400 struct sock *sk = sock->sk; 401 struct xdp_sock *xs = xdp_sk(sk); 402 struct net_device *dev; 403 u32 flags, qid; 404 int err = 0; 405 406 if (addr_len < sizeof(struct sockaddr_xdp)) 407 return -EINVAL; 408 if (sxdp->sxdp_family != AF_XDP) 409 return -EINVAL; 410 411 mutex_lock(&xs->mutex); 412 if (xs->dev) { 413 err = -EBUSY; 414 goto out_release; 415 } 416 417 dev = dev_get_by_index(sock_net(sk), sxdp->sxdp_ifindex); 418 if (!dev) { 419 err = -ENODEV; 420 goto out_release; 421 } 422 423 if (!xs->rx && !xs->tx) { 424 err = -EINVAL; 425 goto out_unlock; 426 } 427 428 qid = sxdp->sxdp_queue_id; 429 flags = sxdp->sxdp_flags; 430 431 if (flags & XDP_SHARED_UMEM) { 432 struct xdp_sock *umem_xs; 433 struct socket *sock; 434 435 if ((flags & XDP_COPY) || (flags & XDP_ZEROCOPY)) { 436 /* Cannot specify flags for shared sockets. */ 437 err = -EINVAL; 438 goto out_unlock; 439 } 440 441 if (xs->umem) { 442 /* We have already our own. */ 443 err = -EINVAL; 444 goto out_unlock; 445 } 446 447 sock = xsk_lookup_xsk_from_fd(sxdp->sxdp_shared_umem_fd); 448 if (IS_ERR(sock)) { 449 err = PTR_ERR(sock); 450 goto out_unlock; 451 } 452 453 umem_xs = xdp_sk(sock->sk); 454 if (!umem_xs->umem) { 455 /* No umem to inherit. */ 456 err = -EBADF; 457 sockfd_put(sock); 458 goto out_unlock; 459 } else if (umem_xs->dev != dev || umem_xs->queue_id != qid) { 460 err = -EINVAL; 461 sockfd_put(sock); 462 goto out_unlock; 463 } 464 465 xdp_get_umem(umem_xs->umem); 466 xs->umem = umem_xs->umem; 467 sockfd_put(sock); 468 } else if (!xs->umem || !xdp_umem_validate_queues(xs->umem)) { 469 err = -EINVAL; 470 goto out_unlock; 471 } else { 472 /* This xsk has its own umem. */ 473 xskq_set_umem(xs->umem->fq, xs->umem->size, 474 xs->umem->chunk_mask); 475 xskq_set_umem(xs->umem->cq, xs->umem->size, 476 xs->umem->chunk_mask); 477 478 err = xdp_umem_assign_dev(xs->umem, dev, qid, flags); 479 if (err) 480 goto out_unlock; 481 } 482 483 xs->dev = dev; 484 xs->zc = xs->umem->zc; 485 xs->queue_id = qid; 486 xskq_set_umem(xs->rx, xs->umem->size, xs->umem->chunk_mask); 487 xskq_set_umem(xs->tx, xs->umem->size, xs->umem->chunk_mask); 488 xdp_add_sk_umem(xs->umem, xs); 489 490 out_unlock: 491 if (err) 492 dev_put(dev); 493 out_release: 494 mutex_unlock(&xs->mutex); 495 return err; 496 } 497 498 static int xsk_setsockopt(struct socket *sock, int level, int optname, 499 char __user *optval, unsigned int optlen) 500 { 501 struct sock *sk = sock->sk; 502 struct xdp_sock *xs = xdp_sk(sk); 503 int err; 504 505 if (level != SOL_XDP) 506 return -ENOPROTOOPT; 507 508 switch (optname) { 509 case XDP_RX_RING: 510 case XDP_TX_RING: 511 { 512 struct xsk_queue **q; 513 int entries; 514 515 if (optlen < sizeof(entries)) 516 return -EINVAL; 517 if (copy_from_user(&entries, optval, sizeof(entries))) 518 return -EFAULT; 519 520 mutex_lock(&xs->mutex); 521 q = (optname == XDP_TX_RING) ? &xs->tx : &xs->rx; 522 err = xsk_init_queue(entries, q, false); 523 mutex_unlock(&xs->mutex); 524 return err; 525 } 526 case XDP_UMEM_REG: 527 { 528 struct xdp_umem_reg mr; 529 struct xdp_umem *umem; 530 531 if (copy_from_user(&mr, optval, sizeof(mr))) 532 return -EFAULT; 533 534 mutex_lock(&xs->mutex); 535 if (xs->umem) { 536 mutex_unlock(&xs->mutex); 537 return -EBUSY; 538 } 539 540 umem = xdp_umem_create(&mr); 541 if (IS_ERR(umem)) { 542 mutex_unlock(&xs->mutex); 543 return PTR_ERR(umem); 544 } 545 546 /* Make sure umem is ready before it can be seen by others */ 547 smp_wmb(); 548 xs->umem = umem; 549 mutex_unlock(&xs->mutex); 550 return 0; 551 } 552 case XDP_UMEM_FILL_RING: 553 case XDP_UMEM_COMPLETION_RING: 554 { 555 struct xsk_queue **q; 556 int entries; 557 558 if (copy_from_user(&entries, optval, sizeof(entries))) 559 return -EFAULT; 560 561 mutex_lock(&xs->mutex); 562 if (!xs->umem) { 563 mutex_unlock(&xs->mutex); 564 return -EINVAL; 565 } 566 567 q = (optname == XDP_UMEM_FILL_RING) ? &xs->umem->fq : 568 &xs->umem->cq; 569 err = xsk_init_queue(entries, q, true); 570 mutex_unlock(&xs->mutex); 571 return err; 572 } 573 default: 574 break; 575 } 576 577 return -ENOPROTOOPT; 578 } 579 580 static int xsk_getsockopt(struct socket *sock, int level, int optname, 581 char __user *optval, int __user *optlen) 582 { 583 struct sock *sk = sock->sk; 584 struct xdp_sock *xs = xdp_sk(sk); 585 int len; 586 587 if (level != SOL_XDP) 588 return -ENOPROTOOPT; 589 590 if (get_user(len, optlen)) 591 return -EFAULT; 592 if (len < 0) 593 return -EINVAL; 594 595 switch (optname) { 596 case XDP_STATISTICS: 597 { 598 struct xdp_statistics stats; 599 600 if (len < sizeof(stats)) 601 return -EINVAL; 602 603 mutex_lock(&xs->mutex); 604 stats.rx_dropped = xs->rx_dropped; 605 stats.rx_invalid_descs = xskq_nb_invalid_descs(xs->rx); 606 stats.tx_invalid_descs = xskq_nb_invalid_descs(xs->tx); 607 mutex_unlock(&xs->mutex); 608 609 if (copy_to_user(optval, &stats, sizeof(stats))) 610 return -EFAULT; 611 if (put_user(sizeof(stats), optlen)) 612 return -EFAULT; 613 614 return 0; 615 } 616 case XDP_MMAP_OFFSETS: 617 { 618 struct xdp_mmap_offsets off; 619 620 if (len < sizeof(off)) 621 return -EINVAL; 622 623 off.rx.producer = offsetof(struct xdp_rxtx_ring, ptrs.producer); 624 off.rx.consumer = offsetof(struct xdp_rxtx_ring, ptrs.consumer); 625 off.rx.desc = offsetof(struct xdp_rxtx_ring, desc); 626 off.tx.producer = offsetof(struct xdp_rxtx_ring, ptrs.producer); 627 off.tx.consumer = offsetof(struct xdp_rxtx_ring, ptrs.consumer); 628 off.tx.desc = offsetof(struct xdp_rxtx_ring, desc); 629 630 off.fr.producer = offsetof(struct xdp_umem_ring, ptrs.producer); 631 off.fr.consumer = offsetof(struct xdp_umem_ring, ptrs.consumer); 632 off.fr.desc = offsetof(struct xdp_umem_ring, desc); 633 off.cr.producer = offsetof(struct xdp_umem_ring, ptrs.producer); 634 off.cr.consumer = offsetof(struct xdp_umem_ring, ptrs.consumer); 635 off.cr.desc = offsetof(struct xdp_umem_ring, desc); 636 637 len = sizeof(off); 638 if (copy_to_user(optval, &off, len)) 639 return -EFAULT; 640 if (put_user(len, optlen)) 641 return -EFAULT; 642 643 return 0; 644 } 645 default: 646 break; 647 } 648 649 return -EOPNOTSUPP; 650 } 651 652 static int xsk_mmap(struct file *file, struct socket *sock, 653 struct vm_area_struct *vma) 654 { 655 loff_t offset = (loff_t)vma->vm_pgoff << PAGE_SHIFT; 656 unsigned long size = vma->vm_end - vma->vm_start; 657 struct xdp_sock *xs = xdp_sk(sock->sk); 658 struct xsk_queue *q = NULL; 659 struct xdp_umem *umem; 660 unsigned long pfn; 661 struct page *qpg; 662 663 if (offset == XDP_PGOFF_RX_RING) { 664 q = READ_ONCE(xs->rx); 665 } else if (offset == XDP_PGOFF_TX_RING) { 666 q = READ_ONCE(xs->tx); 667 } else { 668 umem = READ_ONCE(xs->umem); 669 if (!umem) 670 return -EINVAL; 671 672 if (offset == XDP_UMEM_PGOFF_FILL_RING) 673 q = READ_ONCE(umem->fq); 674 else if (offset == XDP_UMEM_PGOFF_COMPLETION_RING) 675 q = READ_ONCE(umem->cq); 676 } 677 678 if (!q) 679 return -EINVAL; 680 681 qpg = virt_to_head_page(q->ring); 682 if (size > (PAGE_SIZE << compound_order(qpg))) 683 return -EINVAL; 684 685 pfn = virt_to_phys(q->ring) >> PAGE_SHIFT; 686 return remap_pfn_range(vma, vma->vm_start, pfn, 687 size, vma->vm_page_prot); 688 } 689 690 static struct proto xsk_proto = { 691 .name = "XDP", 692 .owner = THIS_MODULE, 693 .obj_size = sizeof(struct xdp_sock), 694 }; 695 696 static const struct proto_ops xsk_proto_ops = { 697 .family = PF_XDP, 698 .owner = THIS_MODULE, 699 .release = xsk_release, 700 .bind = xsk_bind, 701 .connect = sock_no_connect, 702 .socketpair = sock_no_socketpair, 703 .accept = sock_no_accept, 704 .getname = sock_no_getname, 705 .poll = xsk_poll, 706 .ioctl = sock_no_ioctl, 707 .listen = sock_no_listen, 708 .shutdown = sock_no_shutdown, 709 .setsockopt = xsk_setsockopt, 710 .getsockopt = xsk_getsockopt, 711 .sendmsg = xsk_sendmsg, 712 .recvmsg = sock_no_recvmsg, 713 .mmap = xsk_mmap, 714 .sendpage = sock_no_sendpage, 715 }; 716 717 static int xsk_create(struct net *net, struct socket *sock, int protocol, 718 int kern) 719 { 720 struct sock *sk; 721 struct xdp_sock *xs; 722 723 if (!ns_capable(net->user_ns, CAP_NET_RAW)) 724 return -EPERM; 725 if (sock->type != SOCK_RAW) 726 return -ESOCKTNOSUPPORT; 727 728 if (protocol) 729 return -EPROTONOSUPPORT; 730 731 sock->state = SS_UNCONNECTED; 732 733 sk = sk_alloc(net, PF_XDP, GFP_KERNEL, &xsk_proto, kern); 734 if (!sk) 735 return -ENOBUFS; 736 737 sock->ops = &xsk_proto_ops; 738 739 sock_init_data(sock, sk); 740 741 sk->sk_family = PF_XDP; 742 743 sock_set_flag(sk, SOCK_RCU_FREE); 744 745 xs = xdp_sk(sk); 746 mutex_init(&xs->mutex); 747 spin_lock_init(&xs->tx_completion_lock); 748 749 local_bh_disable(); 750 sock_prot_inuse_add(net, &xsk_proto, 1); 751 local_bh_enable(); 752 753 return 0; 754 } 755 756 static const struct net_proto_family xsk_family_ops = { 757 .family = PF_XDP, 758 .create = xsk_create, 759 .owner = THIS_MODULE, 760 }; 761 762 static int __init xsk_init(void) 763 { 764 int err; 765 766 err = proto_register(&xsk_proto, 0 /* no slab */); 767 if (err) 768 goto out; 769 770 err = sock_register(&xsk_family_ops); 771 if (err) 772 goto out_proto; 773 774 return 0; 775 776 out_proto: 777 proto_unregister(&xsk_proto); 778 out: 779 return err; 780 } 781 782 fs_initcall(xsk_init); 783