skbuff.c 2.6 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /* ar-skbuff.c: socket buffer destruction handling
  3. *
  4. * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
  5. * Written by David Howells (dhowells@redhat.com)
  6. */
  7. #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  8. #include <linux/module.h>
  9. #include <linux/net.h>
  10. #include <linux/skbuff.h>
  11. #include <net/sock.h>
  12. #include <net/af_rxrpc.h>
  13. #include "ar-internal.h"
  14. #define is_tx_skb(skb) (rxrpc_skb(skb)->rx_flags & RXRPC_SKB_TX_BUFFER)
  15. #define select_skb_count(skb) (is_tx_skb(skb) ? &rxrpc_n_tx_skbs : &rxrpc_n_rx_skbs)
  16. /*
  17. * Note the allocation or reception of a socket buffer.
  18. */
  19. void rxrpc_new_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
  20. {
  21. const void *here = __builtin_return_address(0);
  22. int n = atomic_inc_return(select_skb_count(skb));
  23. trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n,
  24. rxrpc_skb(skb)->rx_flags, here);
  25. }
  26. /*
  27. * Note the re-emergence of a socket buffer from a queue or buffer.
  28. */
  29. void rxrpc_see_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
  30. {
  31. const void *here = __builtin_return_address(0);
  32. if (skb) {
  33. int n = atomic_read(select_skb_count(skb));
  34. trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n,
  35. rxrpc_skb(skb)->rx_flags, here);
  36. }
  37. }
  38. /*
  39. * Note the addition of a ref on a socket buffer.
  40. */
  41. void rxrpc_get_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
  42. {
  43. const void *here = __builtin_return_address(0);
  44. int n = atomic_inc_return(select_skb_count(skb));
  45. trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n,
  46. rxrpc_skb(skb)->rx_flags, here);
  47. skb_get(skb);
  48. }
  49. /*
  50. * Note the dropping of a ref on a socket buffer by the core.
  51. */
  52. void rxrpc_eaten_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
  53. {
  54. const void *here = __builtin_return_address(0);
  55. int n = atomic_inc_return(&rxrpc_n_rx_skbs);
  56. trace_rxrpc_skb(skb, op, 0, n, 0, here);
  57. }
  58. /*
  59. * Note the destruction of a socket buffer.
  60. */
  61. void rxrpc_free_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
  62. {
  63. const void *here = __builtin_return_address(0);
  64. if (skb) {
  65. int n;
  66. CHECK_SLAB_OKAY(&skb->users);
  67. n = atomic_dec_return(select_skb_count(skb));
  68. trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n,
  69. rxrpc_skb(skb)->rx_flags, here);
  70. kfree_skb(skb);
  71. }
  72. }
  73. /*
  74. * Clear a queue of socket buffers.
  75. */
  76. void rxrpc_purge_queue(struct sk_buff_head *list)
  77. {
  78. const void *here = __builtin_return_address(0);
  79. struct sk_buff *skb;
  80. while ((skb = skb_dequeue((list))) != NULL) {
  81. int n = atomic_dec_return(select_skb_count(skb));
  82. trace_rxrpc_skb(skb, rxrpc_skb_purged,
  83. refcount_read(&skb->users), n,
  84. rxrpc_skb(skb)->rx_flags, here);
  85. kfree_skb(skb);
  86. }
  87. }