1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Data receiving implementation.
4  *
5  * Copyright (c) 2017-2020, 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 
wfx_rx_handle_ba(struct wfx_vif * wvif,struct ieee80211_mgmt * mgmt)16 static void wfx_rx_handle_ba(struct wfx_vif *wvif, struct ieee80211_mgmt *mgmt)
17 {
18 	struct ieee80211_vif *vif = wvif_to_vif(wvif);
19 	int params, tid;
20 
21 	if (wfx_api_older_than(wvif->wdev, 3, 6))
22 		return;
23 
24 	switch (mgmt->u.action.u.addba_req.action_code) {
25 	case WLAN_ACTION_ADDBA_REQ:
26 		params = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
27 		tid = (params & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
28 		ieee80211_start_rx_ba_session_offl(vif, mgmt->sa, tid);
29 		break;
30 	case WLAN_ACTION_DELBA:
31 		params = le16_to_cpu(mgmt->u.action.u.delba.params);
32 		tid = (params &  IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
33 		ieee80211_stop_rx_ba_session_offl(vif, mgmt->sa, tid);
34 		break;
35 	}
36 }
37 
wfx_rx_cb(struct wfx_vif * wvif,const struct wfx_hif_ind_rx * arg,struct sk_buff * skb)38 void wfx_rx_cb(struct wfx_vif *wvif, const struct wfx_hif_ind_rx *arg, struct sk_buff *skb)
39 {
40 	struct ieee80211_rx_status *hdr = IEEE80211_SKB_RXCB(skb);
41 	struct ieee80211_hdr *frame = (struct ieee80211_hdr *)skb->data;
42 	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)skb->data;
43 
44 	memset(hdr, 0, sizeof(*hdr));
45 
46 	if (arg->status == HIF_STATUS_RX_FAIL_MIC)
47 		hdr->flag |= RX_FLAG_MMIC_ERROR | RX_FLAG_IV_STRIPPED;
48 	else if (arg->status)
49 		goto drop;
50 
51 	if (skb->len < sizeof(struct ieee80211_pspoll)) {
52 		dev_warn(wvif->wdev->dev, "malformed SDU received\n");
53 		goto drop;
54 	}
55 
56 	hdr->band = NL80211_BAND_2GHZ;
57 	hdr->freq = ieee80211_channel_to_frequency(arg->channel_number, hdr->band);
58 
59 	if (arg->rxed_rate >= 14) {
60 		hdr->encoding = RX_ENC_HT;
61 		hdr->rate_idx = arg->rxed_rate - 14;
62 	} else if (arg->rxed_rate >= 4) {
63 		hdr->rate_idx = arg->rxed_rate - 2;
64 	} else {
65 		hdr->rate_idx = arg->rxed_rate;
66 	}
67 
68 	if (!arg->rcpi_rssi) {
69 		hdr->flag |= RX_FLAG_NO_SIGNAL_VAL;
70 		dev_info(wvif->wdev->dev, "received frame without RSSI data\n");
71 	}
72 	hdr->signal = arg->rcpi_rssi / 2 - 110;
73 	hdr->antenna = 0;
74 
75 	if (arg->encryp)
76 		hdr->flag |= RX_FLAG_DECRYPTED;
77 
78 	/* Block ack negotiation is offloaded by the firmware. However, re-ordering must be done by
79 	 * the mac80211.
80 	 */
81 	if (ieee80211_is_action(frame->frame_control) &&
82 	    mgmt->u.action.category == WLAN_CATEGORY_BACK &&
83 	    skb->len > IEEE80211_MIN_ACTION_SIZE) {
84 		wfx_rx_handle_ba(wvif, mgmt);
85 		goto drop;
86 	}
87 
88 	ieee80211_rx_irqsafe(wvif->wdev->hw, skb);
89 	return;
90 
91 drop:
92 	dev_kfree_skb(skb);
93 }
94