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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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71f3ca408f
Improve sk_buff tracing within AF_RXRPC by the following means:
(1) Use an enum to note the event type rather than plain integers and use
an array of event names rather than a big multi ?: list.
(2) Distinguish Rx from Tx packets and account them separately. This
requires the call phase to be tracked so that we know what we might
find in rxtx_buffer[].
(3) Add a parameter to rxrpc_{new,see,get,free}_skb() to indicate the
event type.
(4) A pair of 'rotate' events are added to indicate packets that are about
to be rotated out of the Rx and Tx windows.
(5) A pair of 'lost' events are added, along with rxrpc_lose_skb() for
packet loss injection recording.
Signed-off-by: David Howells <dhowells@redhat.com>
105 lines
2.8 KiB
C
105 lines
2.8 KiB
C
/* ar-skbuff.c: socket buffer destruction handling
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/net.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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#include <net/af_rxrpc.h>
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#include "ar-internal.h"
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#define select_skb_count(op) (op >= rxrpc_skb_tx_cleaned ? &rxrpc_n_tx_skbs : &rxrpc_n_rx_skbs)
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/*
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* Note the allocation or reception of a socket buffer.
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*/
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void rxrpc_new_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
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{
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const void *here = __builtin_return_address(0);
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int n = atomic_inc_return(select_skb_count(op));
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trace_rxrpc_skb(skb, op, atomic_read(&skb->users), n, here);
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}
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/*
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* Note the re-emergence of a socket buffer from a queue or buffer.
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*/
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void rxrpc_see_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
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{
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const void *here = __builtin_return_address(0);
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if (skb) {
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int n = atomic_read(select_skb_count(op));
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trace_rxrpc_skb(skb, op, atomic_read(&skb->users), n, here);
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}
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}
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/*
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* Note the addition of a ref on a socket buffer.
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*/
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void rxrpc_get_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
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{
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const void *here = __builtin_return_address(0);
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int n = atomic_inc_return(select_skb_count(op));
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trace_rxrpc_skb(skb, op, atomic_read(&skb->users), n, here);
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skb_get(skb);
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}
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/*
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* Note the destruction of a socket buffer.
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*/
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void rxrpc_free_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
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{
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const void *here = __builtin_return_address(0);
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if (skb) {
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int n;
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CHECK_SLAB_OKAY(&skb->users);
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n = atomic_dec_return(select_skb_count(op));
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trace_rxrpc_skb(skb, op, atomic_read(&skb->users), n, here);
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kfree_skb(skb);
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}
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}
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/*
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* Note the injected loss of a socket buffer.
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*/
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void rxrpc_lose_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
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{
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const void *here = __builtin_return_address(0);
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if (skb) {
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int n;
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CHECK_SLAB_OKAY(&skb->users);
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if (op == rxrpc_skb_tx_lost) {
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n = atomic_read(select_skb_count(op));
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trace_rxrpc_skb(skb, op, atomic_read(&skb->users), n, here);
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} else {
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n = atomic_dec_return(select_skb_count(op));
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trace_rxrpc_skb(skb, op, atomic_read(&skb->users), n, here);
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kfree_skb(skb);
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}
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}
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}
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/*
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* Clear a queue of socket buffers.
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*/
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void rxrpc_purge_queue(struct sk_buff_head *list)
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{
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const void *here = __builtin_return_address(0);
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struct sk_buff *skb;
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while ((skb = skb_dequeue((list))) != NULL) {
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int n = atomic_dec_return(select_skb_count(rxrpc_skb_rx_purged));
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trace_rxrpc_skb(skb, rxrpc_skb_rx_purged,
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atomic_read(&skb->users), n, here);
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kfree_skb(skb);
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}
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}
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