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Date:   Wed, 23 Dec 2020 16:39:17 +0100
From:   Jerome Pouiller <Jerome.Pouiller@...abs.com>
To:     linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S . Miller" <davem@...emloft.net>,
        devicetree@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        linux-mmc@...r.kernel.org,
        Pali Rohár <pali@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Jérôme Pouiller 
        <jerome.pouiller@...abs.com>
Subject: [PATCH v4 16/24] wfx: add data_rx.c/data_rx.h

From: Jérôme Pouiller <jerome.pouiller@...abs.com>

Signed-off-by: Jérôme Pouiller <jerome.pouiller@...abs.com>
---
 drivers/net/wireless/silabs/wfx/data_rx.c | 94 +++++++++++++++++++++++
 drivers/net/wireless/silabs/wfx/data_rx.h | 18 +++++
 2 files changed, 112 insertions(+)
 create mode 100644 drivers/net/wireless/silabs/wfx/data_rx.c
 create mode 100644 drivers/net/wireless/silabs/wfx/data_rx.h

diff --git a/drivers/net/wireless/silabs/wfx/data_rx.c b/drivers/net/wireless/silabs/wfx/data_rx.c
new file mode 100644
index 000000000000..e6d9d8746d4d
--- /dev/null
+++ b/drivers/net/wireless/silabs/wfx/data_rx.c
@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Datapath implementation.
+ *
+ * Copyright (c) 2017-2020, Silicon Laboratories, Inc.
+ * Copyright (c) 2010, ST-Ericsson
+ */
+#include <linux/etherdevice.h>
+#include <net/mac80211.h>
+
+#include "data_rx.h"
+#include "wfx.h"
+#include "bh.h"
+#include "sta.h"
+
+static void wfx_rx_handle_ba(struct wfx_vif *wvif, struct ieee80211_mgmt *mgmt)
+{
+	int params, tid;
+
+	if (wfx_api_older_than(wvif->wdev, 3, 6))
+		return;
+
+	switch (mgmt->u.action.u.addba_req.action_code) {
+	case WLAN_ACTION_ADDBA_REQ:
+		params = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
+		tid = (params & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
+		ieee80211_start_rx_ba_session_offl(wvif->vif, mgmt->sa, tid);
+		break;
+	case WLAN_ACTION_DELBA:
+		params = le16_to_cpu(mgmt->u.action.u.delba.params);
+		tid = (params &  IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
+		ieee80211_stop_rx_ba_session_offl(wvif->vif, mgmt->sa, tid);
+		break;
+	}
+}
+
+void wfx_rx_cb(struct wfx_vif *wvif,
+	       const struct hif_ind_rx *arg, struct sk_buff *skb)
+{
+	struct ieee80211_rx_status *hdr = IEEE80211_SKB_RXCB(skb);
+	struct ieee80211_hdr *frame = (struct ieee80211_hdr *)skb->data;
+	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)skb->data;
+
+	memset(hdr, 0, sizeof(*hdr));
+
+	if (arg->status == HIF_STATUS_RX_FAIL_MIC)
+		hdr->flag |= RX_FLAG_MMIC_ERROR | RX_FLAG_IV_STRIPPED;
+	else if (arg->status)
+		goto drop;
+
+	if (skb->len < sizeof(struct ieee80211_pspoll)) {
+		dev_warn(wvif->wdev->dev, "malformed SDU received\n");
+		goto drop;
+	}
+
+	hdr->band = NL80211_BAND_2GHZ;
+	hdr->freq = ieee80211_channel_to_frequency(arg->channel_number,
+						   hdr->band);
+
+	if (arg->rxed_rate >= 14) {
+		hdr->encoding = RX_ENC_HT;
+		hdr->rate_idx = arg->rxed_rate - 14;
+	} else if (arg->rxed_rate >= 4) {
+		hdr->rate_idx = arg->rxed_rate - 2;
+	} else {
+		hdr->rate_idx = arg->rxed_rate;
+	}
+
+	if (!arg->rcpi_rssi) {
+		hdr->flag |= RX_FLAG_NO_SIGNAL_VAL;
+		dev_info(wvif->wdev->dev, "received frame without RSSI data\n");
+	}
+	hdr->signal = arg->rcpi_rssi / 2 - 110;
+	hdr->antenna = 0;
+
+	if (arg->encryp)
+		hdr->flag |= RX_FLAG_DECRYPTED;
+
+	/* Block ack negotiation is offloaded by the firmware. However,
+	 * re-ordering must be done by the mac80211.
+	 */
+	if (ieee80211_is_action(frame->frame_control) &&
+	    mgmt->u.action.category == WLAN_CATEGORY_BACK &&
+	    skb->len > IEEE80211_MIN_ACTION_SIZE) {
+		wfx_rx_handle_ba(wvif, mgmt);
+		goto drop;
+	}
+
+	ieee80211_rx_irqsafe(wvif->wdev->hw, skb);
+	return;
+
+drop:
+	dev_kfree_skb(skb);
+}
diff --git a/drivers/net/wireless/silabs/wfx/data_rx.h b/drivers/net/wireless/silabs/wfx/data_rx.h
new file mode 100644
index 000000000000..a320cd858273
--- /dev/null
+++ b/drivers/net/wireless/silabs/wfx/data_rx.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Datapath implementation.
+ *
+ * Copyright (c) 2017-2020, Silicon Laboratories, Inc.
+ * Copyright (c) 2010, ST-Ericsson
+ */
+#ifndef WFX_DATA_RX_H
+#define WFX_DATA_RX_H
+
+struct wfx_vif;
+struct sk_buff;
+struct hif_ind_rx;
+
+void wfx_rx_cb(struct wfx_vif *wvif,
+	       const struct hif_ind_rx *arg, struct sk_buff *skb);
+
+#endif
-- 
2.29.2

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