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 *buffer; 59 u64 addr; 60 int err; 61 62 if (!xskq_peek_addr(xs->umem->fq, &addr) || 63 len > xs->umem->chunk_size_nohr) { 64 xs->rx_dropped++; 65 return -ENOSPC; 66 } 67 68 addr += xs->umem->headroom; 69 70 buffer = xdp_umem_get_data(xs->umem, addr); 71 memcpy(buffer, xdp->data, len); 72 err = xskq_produce_batch_desc(xs->rx, addr, len); 73 if (!err) { 74 xskq_discard_addr(xs->umem->fq); 75 xdp_return_buff(xdp); 76 return 0; 77 } 78 79 xs->rx_dropped++; 80 return err; 81 } 82 83 static int __xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len) 84 { 85 int err = xskq_produce_batch_desc(xs->rx, (u64)xdp->handle, len); 86 87 if (err) { 88 xdp_return_buff(xdp); 89 xs->rx_dropped++; 90 } 91 92 return err; 93 } 94 95 int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) 96 { 97 u32 len; 98 99 if (xs->dev != xdp->rxq->dev || xs->queue_id != xdp->rxq->queue_index) 100 return -EINVAL; 101 102 len = xdp->data_end - xdp->data; 103 104 return (xdp->rxq->mem.type == MEM_TYPE_ZERO_COPY) ? 105 __xsk_rcv_zc(xs, xdp, len) : __xsk_rcv(xs, xdp, len); 106 } 107 108 void xsk_flush(struct xdp_sock *xs) 109 { 110 xskq_produce_flush_desc(xs->rx); 111 xs->sk.sk_data_ready(&xs->sk); 112 } 113 114 int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) 115 { 116 u32 len = xdp->data_end - xdp->data; 117 void *buffer; 118 u64 addr; 119 int err; 120 121 if (xs->dev != xdp->rxq->dev || xs->queue_id != xdp->rxq->queue_index) 122 return -EINVAL; 123 124 if (!xskq_peek_addr(xs->umem->fq, &addr) || 125 len > xs->umem->chunk_size_nohr) { 126 xs->rx_dropped++; 127 return -ENOSPC; 128 } 129 130 addr += xs->umem->headroom; 131 132 buffer = xdp_umem_get_data(xs->umem, addr); 133 memcpy(buffer, xdp->data, len); 134 err = xskq_produce_batch_desc(xs->rx, addr, len); 135 if (!err) { 136 xskq_discard_addr(xs->umem->fq); 137 xsk_flush(xs); 138 return 0; 139 } 140 141 xs->rx_dropped++; 142 return err; 143 } 144 145 void xsk_umem_complete_tx(struct xdp_umem *umem, u32 nb_entries) 146 { 147 xskq_produce_flush_addr_n(umem->cq, nb_entries); 148 } 149 EXPORT_SYMBOL(xsk_umem_complete_tx); 150 151 void xsk_umem_consume_tx_done(struct xdp_umem *umem) 152 { 153 struct xdp_sock *xs; 154 155 rcu_read_lock(); 156 list_for_each_entry_rcu(xs, &umem->xsk_list, list) { 157 xs->sk.sk_write_space(&xs->sk); 158 } 159 rcu_read_unlock(); 160 } 161 EXPORT_SYMBOL(xsk_umem_consume_tx_done); 162 163 bool xsk_umem_consume_tx(struct xdp_umem *umem, dma_addr_t *dma, u32 *len) 164 { 165 struct xdp_desc desc; 166 struct xdp_sock *xs; 167 168 rcu_read_lock(); 169 list_for_each_entry_rcu(xs, &umem->xsk_list, list) { 170 if (!xskq_peek_desc(xs->tx, &desc)) 171 continue; 172 173 if (xskq_produce_addr_lazy(umem->cq, desc.addr)) 174 goto out; 175 176 *dma = xdp_umem_get_dma(umem, desc.addr); 177 *len = desc.len; 178 179 xskq_discard_desc(xs->tx); 180 rcu_read_unlock(); 181 return true; 182 } 183 184 out: 185 rcu_read_unlock(); 186 return false; 187 } 188 EXPORT_SYMBOL(xsk_umem_consume_tx); 189 190 static int xsk_zc_xmit(struct sock *sk) 191 { 192 struct xdp_sock *xs = xdp_sk(sk); 193 struct net_device *dev = xs->dev; 194 195 return dev->netdev_ops->ndo_xsk_async_xmit(dev, xs->queue_id); 196 } 197 198 static void xsk_destruct_skb(struct sk_buff *skb) 199 { 200 u64 addr = (u64)(long)skb_shinfo(skb)->destructor_arg; 201 struct xdp_sock *xs = xdp_sk(skb->sk); 202 unsigned long flags; 203 204 spin_lock_irqsave(&xs->tx_completion_lock, flags); 205 WARN_ON_ONCE(xskq_produce_addr(xs->umem->cq, addr)); 206 spin_unlock_irqrestore(&xs->tx_completion_lock, flags); 207 208 sock_wfree(skb); 209 } 210 211 static int xsk_generic_xmit(struct sock *sk, struct msghdr *m, 212 size_t total_len) 213 { 214 u32 max_batch = TX_BATCH_SIZE; 215 struct xdp_sock *xs = xdp_sk(sk); 216 bool sent_frame = false; 217 struct xdp_desc desc; 218 struct sk_buff *skb; 219 int err = 0; 220 221 mutex_lock(&xs->mutex); 222 223 while (xskq_peek_desc(xs->tx, &desc)) { 224 char *buffer; 225 u64 addr; 226 u32 len; 227 228 if (max_batch-- == 0) { 229 err = -EAGAIN; 230 goto out; 231 } 232 233 if (xskq_reserve_addr(xs->umem->cq)) 234 goto out; 235 236 if (xs->queue_id >= xs->dev->real_num_tx_queues) 237 goto out; 238 239 len = desc.len; 240 skb = sock_alloc_send_skb(sk, len, 1, &err); 241 if (unlikely(!skb)) { 242 err = -EAGAIN; 243 goto out; 244 } 245 246 skb_put(skb, len); 247 addr = desc.addr; 248 buffer = xdp_umem_get_data(xs->umem, addr); 249 err = skb_store_bits(skb, 0, buffer, len); 250 if (unlikely(err)) { 251 kfree_skb(skb); 252 goto out; 253 } 254 255 skb->dev = xs->dev; 256 skb->priority = sk->sk_priority; 257 skb->mark = sk->sk_mark; 258 skb_shinfo(skb)->destructor_arg = (void *)(long)addr; 259 skb->destructor = xsk_destruct_skb; 260 261 err = dev_direct_xmit(skb, xs->queue_id); 262 xskq_discard_desc(xs->tx); 263 /* Ignore NET_XMIT_CN as packet might have been sent */ 264 if (err == NET_XMIT_DROP || err == NETDEV_TX_BUSY) { 265 /* SKB completed but not sent */ 266 err = -EBUSY; 267 goto out; 268 } 269 270 sent_frame = true; 271 } 272 273 out: 274 if (sent_frame) 275 sk->sk_write_space(sk); 276 277 mutex_unlock(&xs->mutex); 278 return err; 279 } 280 281 static int xsk_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) 282 { 283 bool need_wait = !(m->msg_flags & MSG_DONTWAIT); 284 struct sock *sk = sock->sk; 285 struct xdp_sock *xs = xdp_sk(sk); 286 287 if (unlikely(!xs->dev)) 288 return -ENXIO; 289 if (unlikely(!(xs->dev->flags & IFF_UP))) 290 return -ENETDOWN; 291 if (unlikely(!xs->tx)) 292 return -ENOBUFS; 293 if (need_wait) 294 return -EOPNOTSUPP; 295 296 return (xs->zc) ? xsk_zc_xmit(sk) : xsk_generic_xmit(sk, m, total_len); 297 } 298 299 static unsigned int xsk_poll(struct file *file, struct socket *sock, 300 struct poll_table_struct *wait) 301 { 302 unsigned int mask = datagram_poll(file, sock, wait); 303 struct sock *sk = sock->sk; 304 struct xdp_sock *xs = xdp_sk(sk); 305 306 if (xs->rx && !xskq_empty_desc(xs->rx)) 307 mask |= POLLIN | POLLRDNORM; 308 if (xs->tx && !xskq_full_desc(xs->tx)) 309 mask |= POLLOUT | POLLWRNORM; 310 311 return mask; 312 } 313 314 static int xsk_init_queue(u32 entries, struct xsk_queue **queue, 315 bool umem_queue) 316 { 317 struct xsk_queue *q; 318 319 if (entries == 0 || *queue || !is_power_of_2(entries)) 320 return -EINVAL; 321 322 q = xskq_create(entries, umem_queue); 323 if (!q) 324 return -ENOMEM; 325 326 /* Make sure queue is ready before it can be seen by others */ 327 smp_wmb(); 328 *queue = q; 329 return 0; 330 } 331 332 static int xsk_release(struct socket *sock) 333 { 334 struct sock *sk = sock->sk; 335 struct xdp_sock *xs = xdp_sk(sk); 336 struct net *net; 337 338 if (!sk) 339 return 0; 340 341 net = sock_net(sk); 342 343 local_bh_disable(); 344 sock_prot_inuse_add(net, sk->sk_prot, -1); 345 local_bh_enable(); 346 347 if (xs->dev) { 348 /* Wait for driver to stop using the xdp socket. */ 349 synchronize_net(); 350 dev_put(xs->dev); 351 xs->dev = NULL; 352 } 353 354 sock_orphan(sk); 355 sock->sk = NULL; 356 357 sk_refcnt_debug_release(sk); 358 sock_put(sk); 359 360 return 0; 361 } 362 363 static struct socket *xsk_lookup_xsk_from_fd(int fd) 364 { 365 struct socket *sock; 366 int err; 367 368 sock = sockfd_lookup(fd, &err); 369 if (!sock) 370 return ERR_PTR(-ENOTSOCK); 371 372 if (sock->sk->sk_family != PF_XDP) { 373 sockfd_put(sock); 374 return ERR_PTR(-ENOPROTOOPT); 375 } 376 377 return sock; 378 } 379 380 static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len) 381 { 382 struct sockaddr_xdp *sxdp = (struct sockaddr_xdp *)addr; 383 struct sock *sk = sock->sk; 384 struct xdp_sock *xs = xdp_sk(sk); 385 struct net_device *dev; 386 u32 flags, qid; 387 int err = 0; 388 389 if (addr_len < sizeof(struct sockaddr_xdp)) 390 return -EINVAL; 391 if (sxdp->sxdp_family != AF_XDP) 392 return -EINVAL; 393 394 mutex_lock(&xs->mutex); 395 if (xs->dev) { 396 err = -EBUSY; 397 goto out_release; 398 } 399 400 dev = dev_get_by_index(sock_net(sk), sxdp->sxdp_ifindex); 401 if (!dev) { 402 err = -ENODEV; 403 goto out_release; 404 } 405 406 if (!xs->rx && !xs->tx) { 407 err = -EINVAL; 408 goto out_unlock; 409 } 410 411 qid = sxdp->sxdp_queue_id; 412 413 if ((xs->rx && qid >= dev->real_num_rx_queues) || 414 (xs->tx && qid >= dev->real_num_tx_queues)) { 415 err = -EINVAL; 416 goto out_unlock; 417 } 418 419 flags = sxdp->sxdp_flags; 420 421 if (flags & XDP_SHARED_UMEM) { 422 struct xdp_sock *umem_xs; 423 struct socket *sock; 424 425 if ((flags & XDP_COPY) || (flags & XDP_ZEROCOPY)) { 426 /* Cannot specify flags for shared sockets. */ 427 err = -EINVAL; 428 goto out_unlock; 429 } 430 431 if (xs->umem) { 432 /* We have already our own. */ 433 err = -EINVAL; 434 goto out_unlock; 435 } 436 437 sock = xsk_lookup_xsk_from_fd(sxdp->sxdp_shared_umem_fd); 438 if (IS_ERR(sock)) { 439 err = PTR_ERR(sock); 440 goto out_unlock; 441 } 442 443 umem_xs = xdp_sk(sock->sk); 444 if (!umem_xs->umem) { 445 /* No umem to inherit. */ 446 err = -EBADF; 447 sockfd_put(sock); 448 goto out_unlock; 449 } else if (umem_xs->dev != dev || umem_xs->queue_id != qid) { 450 err = -EINVAL; 451 sockfd_put(sock); 452 goto out_unlock; 453 } 454 455 xdp_get_umem(umem_xs->umem); 456 xs->umem = umem_xs->umem; 457 sockfd_put(sock); 458 } else if (!xs->umem || !xdp_umem_validate_queues(xs->umem)) { 459 err = -EINVAL; 460 goto out_unlock; 461 } else { 462 /* This xsk has its own umem. */ 463 xskq_set_umem(xs->umem->fq, &xs->umem->props); 464 xskq_set_umem(xs->umem->cq, &xs->umem->props); 465 466 err = xdp_umem_assign_dev(xs->umem, dev, qid, flags); 467 if (err) 468 goto out_unlock; 469 } 470 471 xs->dev = dev; 472 xs->zc = xs->umem->zc; 473 xs->queue_id = qid; 474 xskq_set_umem(xs->rx, &xs->umem->props); 475 xskq_set_umem(xs->tx, &xs->umem->props); 476 xdp_add_sk_umem(xs->umem, xs); 477 478 out_unlock: 479 if (err) 480 dev_put(dev); 481 out_release: 482 mutex_unlock(&xs->mutex); 483 return err; 484 } 485 486 static int xsk_setsockopt(struct socket *sock, int level, int optname, 487 char __user *optval, unsigned int optlen) 488 { 489 struct sock *sk = sock->sk; 490 struct xdp_sock *xs = xdp_sk(sk); 491 int err; 492 493 if (level != SOL_XDP) 494 return -ENOPROTOOPT; 495 496 switch (optname) { 497 case XDP_RX_RING: 498 case XDP_TX_RING: 499 { 500 struct xsk_queue **q; 501 int entries; 502 503 if (optlen < sizeof(entries)) 504 return -EINVAL; 505 if (copy_from_user(&entries, optval, sizeof(entries))) 506 return -EFAULT; 507 508 mutex_lock(&xs->mutex); 509 q = (optname == XDP_TX_RING) ? &xs->tx : &xs->rx; 510 err = xsk_init_queue(entries, q, false); 511 mutex_unlock(&xs->mutex); 512 return err; 513 } 514 case XDP_UMEM_REG: 515 { 516 struct xdp_umem_reg mr; 517 struct xdp_umem *umem; 518 519 if (copy_from_user(&mr, optval, sizeof(mr))) 520 return -EFAULT; 521 522 mutex_lock(&xs->mutex); 523 if (xs->umem) { 524 mutex_unlock(&xs->mutex); 525 return -EBUSY; 526 } 527 528 umem = xdp_umem_create(&mr); 529 if (IS_ERR(umem)) { 530 mutex_unlock(&xs->mutex); 531 return PTR_ERR(umem); 532 } 533 534 /* Make sure umem is ready before it can be seen by others */ 535 smp_wmb(); 536 xs->umem = umem; 537 mutex_unlock(&xs->mutex); 538 return 0; 539 } 540 case XDP_UMEM_FILL_RING: 541 case XDP_UMEM_COMPLETION_RING: 542 { 543 struct xsk_queue **q; 544 int entries; 545 546 if (copy_from_user(&entries, optval, sizeof(entries))) 547 return -EFAULT; 548 549 mutex_lock(&xs->mutex); 550 if (!xs->umem) { 551 mutex_unlock(&xs->mutex); 552 return -EINVAL; 553 } 554 555 q = (optname == XDP_UMEM_FILL_RING) ? &xs->umem->fq : 556 &xs->umem->cq; 557 err = xsk_init_queue(entries, q, true); 558 mutex_unlock(&xs->mutex); 559 return err; 560 } 561 default: 562 break; 563 } 564 565 return -ENOPROTOOPT; 566 } 567 568 static int xsk_getsockopt(struct socket *sock, int level, int optname, 569 char __user *optval, int __user *optlen) 570 { 571 struct sock *sk = sock->sk; 572 struct xdp_sock *xs = xdp_sk(sk); 573 int len; 574 575 if (level != SOL_XDP) 576 return -ENOPROTOOPT; 577 578 if (get_user(len, optlen)) 579 return -EFAULT; 580 if (len < 0) 581 return -EINVAL; 582 583 switch (optname) { 584 case XDP_STATISTICS: 585 { 586 struct xdp_statistics stats; 587 588 if (len < sizeof(stats)) 589 return -EINVAL; 590 591 mutex_lock(&xs->mutex); 592 stats.rx_dropped = xs->rx_dropped; 593 stats.rx_invalid_descs = xskq_nb_invalid_descs(xs->rx); 594 stats.tx_invalid_descs = xskq_nb_invalid_descs(xs->tx); 595 mutex_unlock(&xs->mutex); 596 597 if (copy_to_user(optval, &stats, sizeof(stats))) 598 return -EFAULT; 599 if (put_user(sizeof(stats), optlen)) 600 return -EFAULT; 601 602 return 0; 603 } 604 case XDP_MMAP_OFFSETS: 605 { 606 struct xdp_mmap_offsets off; 607 608 if (len < sizeof(off)) 609 return -EINVAL; 610 611 off.rx.producer = offsetof(struct xdp_rxtx_ring, ptrs.producer); 612 off.rx.consumer = offsetof(struct xdp_rxtx_ring, ptrs.consumer); 613 off.rx.desc = offsetof(struct xdp_rxtx_ring, desc); 614 off.tx.producer = offsetof(struct xdp_rxtx_ring, ptrs.producer); 615 off.tx.consumer = offsetof(struct xdp_rxtx_ring, ptrs.consumer); 616 off.tx.desc = offsetof(struct xdp_rxtx_ring, desc); 617 618 off.fr.producer = offsetof(struct xdp_umem_ring, ptrs.producer); 619 off.fr.consumer = offsetof(struct xdp_umem_ring, ptrs.consumer); 620 off.fr.desc = offsetof(struct xdp_umem_ring, desc); 621 off.cr.producer = offsetof(struct xdp_umem_ring, ptrs.producer); 622 off.cr.consumer = offsetof(struct xdp_umem_ring, ptrs.consumer); 623 off.cr.desc = offsetof(struct xdp_umem_ring, desc); 624 625 len = sizeof(off); 626 if (copy_to_user(optval, &off, len)) 627 return -EFAULT; 628 if (put_user(len, optlen)) 629 return -EFAULT; 630 631 return 0; 632 } 633 default: 634 break; 635 } 636 637 return -EOPNOTSUPP; 638 } 639 640 static int xsk_mmap(struct file *file, struct socket *sock, 641 struct vm_area_struct *vma) 642 { 643 loff_t offset = (loff_t)vma->vm_pgoff << PAGE_SHIFT; 644 unsigned long size = vma->vm_end - vma->vm_start; 645 struct xdp_sock *xs = xdp_sk(sock->sk); 646 struct xsk_queue *q = NULL; 647 struct xdp_umem *umem; 648 unsigned long pfn; 649 struct page *qpg; 650 651 if (offset == XDP_PGOFF_RX_RING) { 652 q = READ_ONCE(xs->rx); 653 } else if (offset == XDP_PGOFF_TX_RING) { 654 q = READ_ONCE(xs->tx); 655 } else { 656 umem = READ_ONCE(xs->umem); 657 if (!umem) 658 return -EINVAL; 659 660 if (offset == XDP_UMEM_PGOFF_FILL_RING) 661 q = READ_ONCE(umem->fq); 662 else if (offset == XDP_UMEM_PGOFF_COMPLETION_RING) 663 q = READ_ONCE(umem->cq); 664 } 665 666 if (!q) 667 return -EINVAL; 668 669 qpg = virt_to_head_page(q->ring); 670 if (size > (PAGE_SIZE << compound_order(qpg))) 671 return -EINVAL; 672 673 pfn = virt_to_phys(q->ring) >> PAGE_SHIFT; 674 return remap_pfn_range(vma, vma->vm_start, pfn, 675 size, vma->vm_page_prot); 676 } 677 678 static struct proto xsk_proto = { 679 .name = "XDP", 680 .owner = THIS_MODULE, 681 .obj_size = sizeof(struct xdp_sock), 682 }; 683 684 static const struct proto_ops xsk_proto_ops = { 685 .family = PF_XDP, 686 .owner = THIS_MODULE, 687 .release = xsk_release, 688 .bind = xsk_bind, 689 .connect = sock_no_connect, 690 .socketpair = sock_no_socketpair, 691 .accept = sock_no_accept, 692 .getname = sock_no_getname, 693 .poll = xsk_poll, 694 .ioctl = sock_no_ioctl, 695 .listen = sock_no_listen, 696 .shutdown = sock_no_shutdown, 697 .setsockopt = xsk_setsockopt, 698 .getsockopt = xsk_getsockopt, 699 .sendmsg = xsk_sendmsg, 700 .recvmsg = sock_no_recvmsg, 701 .mmap = xsk_mmap, 702 .sendpage = sock_no_sendpage, 703 }; 704 705 static void xsk_destruct(struct sock *sk) 706 { 707 struct xdp_sock *xs = xdp_sk(sk); 708 709 if (!sock_flag(sk, SOCK_DEAD)) 710 return; 711 712 xskq_destroy(xs->rx); 713 xskq_destroy(xs->tx); 714 xdp_del_sk_umem(xs->umem, xs); 715 xdp_put_umem(xs->umem); 716 717 sk_refcnt_debug_dec(sk); 718 } 719 720 static int xsk_create(struct net *net, struct socket *sock, int protocol, 721 int kern) 722 { 723 struct sock *sk; 724 struct xdp_sock *xs; 725 726 if (!ns_capable(net->user_ns, CAP_NET_RAW)) 727 return -EPERM; 728 if (sock->type != SOCK_RAW) 729 return -ESOCKTNOSUPPORT; 730 731 if (protocol) 732 return -EPROTONOSUPPORT; 733 734 sock->state = SS_UNCONNECTED; 735 736 sk = sk_alloc(net, PF_XDP, GFP_KERNEL, &xsk_proto, kern); 737 if (!sk) 738 return -ENOBUFS; 739 740 sock->ops = &xsk_proto_ops; 741 742 sock_init_data(sock, sk); 743 744 sk->sk_family = PF_XDP; 745 746 sk->sk_destruct = xsk_destruct; 747 sk_refcnt_debug_inc(sk); 748 749 xs = xdp_sk(sk); 750 mutex_init(&xs->mutex); 751 spin_lock_init(&xs->tx_completion_lock); 752 753 local_bh_disable(); 754 sock_prot_inuse_add(net, &xsk_proto, 1); 755 local_bh_enable(); 756 757 return 0; 758 } 759 760 static const struct net_proto_family xsk_family_ops = { 761 .family = PF_XDP, 762 .create = xsk_create, 763 .owner = THIS_MODULE, 764 }; 765 766 static int __init xsk_init(void) 767 { 768 int err; 769 770 err = proto_register(&xsk_proto, 0 /* no slab */); 771 if (err) 772 goto out; 773 774 err = sock_register(&xsk_family_ops); 775 if (err) 776 goto out_proto; 777 778 return 0; 779 780 out_proto: 781 proto_unregister(&xsk_proto); 782 out: 783 return err; 784 } 785 786 fs_initcall(xsk_init); 787