drivers/net/wireless/intel/iwlwifi/iwl-devtrace.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /******************************************************************************
   3  *
   4  * Copyright(c) 2009 - 2014 Intel Corporation. All rights reserved.
   5  * Copyright(C) 2016        Intel Deutschland GmbH
   6  * Copyright(c) 2018, 2023  Intel Corporation
   7  *****************************************************************************/
   8
   9 #ifndef __IWLWIFI_DEVICE_TRACE
  10 #define __IWLWIFI_DEVICE_TRACE
  11 #include <linux/skbuff.h>
  12 #include <linux/ieee80211.h>
  13 #include <net/cfg80211.h>
  14 #include <net/mac80211.h>
  15 #include "iwl-trans.h"
  16 static inline bool iwl_trace_data(struct sk_buff *skb)
  17 {
  18         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  19         struct ieee80211_hdr *hdr = (void *)skb->data;
  20         __le16 fc = hdr->frame_control;
  21         int offs = 24; /* start with normal header length */
  22
  23         if (!ieee80211_is_data(fc))
  24                 return false;
  25
  26         /* If upper layers wanted TX status it's an important frame */
  27         if (info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS)
  28                 return false;
  29
  30         /* Try to determine if the frame is EAPOL. This might have false
  31          * positives (if there's no RFC 1042 header and we compare to some
  32          * payload instead) but since we're only doing tracing that's not
  33          * a problem.
  34          */
  35
  36         if (ieee80211_has_a4(fc))
  37                 offs += 6;
  38         if (ieee80211_is_data_qos(fc))
  39                 offs += 2;
  40         /* don't account for crypto - these are unencrypted */
  41
  42         /* also account for the RFC 1042 header, of course */
  43         offs += 6;
  44
  45         return skb->len <= offs + 2 ||
  46                 *(__be16 *)(skb->data + offs) != cpu_to_be16(ETH_P_PAE);
  47 }
  48
  49 static inline size_t iwl_rx_trace_len(const struct iwl_trans *trans,
  50                                       void *rxbuf, size_t len,
  51                                       size_t *out_hdr_offset)
  52 {
  53         struct iwl_cmd_header *cmd = (void *)((u8 *)rxbuf + sizeof(__le32));
  54         struct ieee80211_hdr *hdr = NULL;
  55         size_t hdr_offset;
  56
  57         if (cmd->cmd != trans->rx_mpdu_cmd)
  58                 return len;
  59
  60         hdr_offset = sizeof(struct iwl_cmd_header) +
  61                      trans->rx_mpdu_cmd_hdr_size;
  62
  63         if (out_hdr_offset)
  64                 *out_hdr_offset = hdr_offset;
  65
  66         hdr = (void *)((u8 *)cmd + hdr_offset);
  67         if (!ieee80211_is_data(hdr->frame_control))
  68                 return len;
  69         /* maybe try to identify EAPOL frames? */
  70         return sizeof(__le32) + sizeof(*cmd) + trans->rx_mpdu_cmd_hdr_size +
  71                 ieee80211_hdrlen(hdr->frame_control);
  72 }
  73
  74 #include <linux/tracepoint.h>
  75 #include <linux/device.h>
  76
  77
  78 #if !defined(CONFIG_IWLWIFI_DEVICE_TRACING) || defined(__CHECKER__)
  79 #undef TRACE_EVENT
  80 #define TRACE_EVENT(name, proto, ...) \
  81 static inline void trace_ ## name(proto) {}
  82 #undef DECLARE_EVENT_CLASS
  83 #define DECLARE_EVENT_CLASS(...)
  84 #undef DEFINE_EVENT
  85 #define DEFINE_EVENT(evt_class, name, proto, ...) \
  86 static inline void trace_ ## name(proto) {}
  87 #endif
  88
  89 #define DEV_ENTRY       __string(dev, dev_name(dev))
  90 #define DEV_ASSIGN      __assign_str(dev)
  91
  92 #include "iwl-devtrace-io.h"
  93 #include "iwl-devtrace-ucode.h"
  94 #include "iwl-devtrace-msg.h"
  95 #include "iwl-devtrace-data.h"
  96 #include "iwl-devtrace-iwlwifi.h"
  97
  98 #ifdef CONFIG_IWLWIFI_DEVICE_TRACING
  99 DECLARE_TRACEPOINT(iwlwifi_dev_rx);
 100 DECLARE_TRACEPOINT(iwlwifi_dev_rx_data);
 101 #endif
 102
 103 void __trace_iwlwifi_dev_rx(struct iwl_trans *trans, void *pkt, size_t len);
 104
 105 static inline void maybe_trace_iwlwifi_dev_rx(struct iwl_trans *trans,
 106                                               void *pkt, size_t len)
 107 {
 108 #ifdef CONFIG_IWLWIFI_DEVICE_TRACING
 109         if (tracepoint_enabled(iwlwifi_dev_rx) ||
 110             tracepoint_enabled(iwlwifi_dev_rx_data))
 111                 __trace_iwlwifi_dev_rx(trans, pkt, len);
 112 #endif
 113 }
 114 #endif /* __IWLWIFI_DEVICE_TRACE */