drivers/staging/wfx/data_rx.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Datapath implementation.
   4  *
   5  * Copyright (c) 2017-2019, Silicon Laboratories, Inc.
   6  * Copyright (c) 2010, ST-Ericsson
   7  */
   8 #include <linux/etherdevice.h>
   9 #include <net/mac80211.h>
  10
  11 #include "data_rx.h"
  12 #include "wfx.h"
  13 #include "bh.h"
  14 #include "sta.h"
  15
  16 static void wfx_rx_handle_ba(struct wfx_vif *wvif, struct ieee80211_mgmt *mgmt)
  17 {
  18         int params, tid;
  19
  20         switch (mgmt->u.action.u.addba_req.action_code) {
  21         case WLAN_ACTION_ADDBA_REQ:
  22                 params = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
  23                 tid = (params & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
  24                 ieee80211_start_rx_ba_session_offl(wvif->vif, mgmt->sa, tid);
  25                 break;
  26         case WLAN_ACTION_DELBA:
  27                 params = le16_to_cpu(mgmt->u.action.u.delba.params);
  28                 tid = (params &  IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
  29                 ieee80211_stop_rx_ba_session_offl(wvif->vif, mgmt->sa, tid);
  30                 break;
  31         }
  32 }
  33
  34 void wfx_rx_cb(struct wfx_vif *wvif,
  35                const struct hif_ind_rx *arg, struct sk_buff *skb)
  36 {
  37         struct ieee80211_rx_status *hdr = IEEE80211_SKB_RXCB(skb);
  38         struct ieee80211_hdr *frame = (struct ieee80211_hdr *)skb->data;
  39         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)skb->data;
  40
  41         memset(hdr, 0, sizeof(*hdr));
  42
  43         if (arg->status == HIF_STATUS_RX_FAIL_MIC)
  44                 hdr->flag |= RX_FLAG_MMIC_ERROR | RX_FLAG_IV_STRIPPED;
  45         else if (arg->status)
  46                 goto drop;
  47
  48         if (skb->len < sizeof(struct ieee80211_pspoll)) {
  49                 dev_warn(wvif->wdev->dev, "malformed SDU received\n");
  50                 goto drop;
  51         }
  52
  53         hdr->band = NL80211_BAND_2GHZ;
  54         hdr->freq = ieee80211_channel_to_frequency(arg->channel_number,
  55                                                    hdr->band);
  56
  57         if (arg->rxed_rate >= 14) {
  58                 hdr->encoding = RX_ENC_HT;
  59                 hdr->rate_idx = arg->rxed_rate - 14;
  60         } else if (arg->rxed_rate >= 4) {
  61                 hdr->rate_idx = arg->rxed_rate - 2;
  62         } else {
  63                 hdr->rate_idx = arg->rxed_rate;
  64         }
  65
  66         if (!arg->rcpi_rssi) {
  67                 hdr->flag |= RX_FLAG_NO_SIGNAL_VAL;
  68                 dev_info(wvif->wdev->dev, "received frame without RSSI data\n");
  69         }
  70         hdr->signal = arg->rcpi_rssi / 2 - 110;
  71         hdr->antenna = 0;
  72
  73         if (arg->encryp)
  74                 hdr->flag |= RX_FLAG_DECRYPTED;
  75
  76         // Block ack negotiation is offloaded by the firmware. However,
  77         // re-ordering must be done by the mac80211.
  78         if (ieee80211_is_action(frame->frame_control) &&
  79             mgmt->u.action.category == WLAN_CATEGORY_BACK &&
  80             skb->len > IEEE80211_MIN_ACTION_SIZE) {
  81                 wfx_rx_handle_ba(wvif, mgmt);
  82                 goto drop;
  83         }
  84
  85         ieee80211_rx_irqsafe(wvif->wdev->hw, skb);
  86         return;
  87
  88 drop:
  89         dev_kfree_skb(skb);
  90 }