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
16static 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
38void 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
91drop:
92	dev_kfree_skb(skb);
93}
94