Message-Id: <20210920161136.2398632-16-Jerome.Pouiller@silabs.com>
Date:   Mon, 20 Sep 2021 18:11:27 +0200
From:   Jerome Pouiller <Jerome.Pouiller@...abs.com>
To:     linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        Kalle Valo <kvalo@...eaurora.org>
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.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 v7 15/24] wfx: add hif_rx.c/hif_rx.h

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

Signed-off-by: Jérôme Pouiller <jerome.pouiller@...abs.com>
---
 drivers/net/wireless/silabs/wfx/hif_rx.c | 415 +++++++++++++++++++++++
 drivers/net/wireless/silabs/wfx/hif_rx.h |  17 +
 2 files changed, 432 insertions(+)
 create mode 100644 drivers/net/wireless/silabs/wfx/hif_rx.c
 create mode 100644 drivers/net/wireless/silabs/wfx/hif_rx.h

diff --git a/drivers/net/wireless/silabs/wfx/hif_rx.c b/drivers/net/wireless/silabs/wfx/hif_rx.c
new file mode 100644
index 000000000000..2e6db5b99708
--- /dev/null
+++ b/drivers/net/wireless/silabs/wfx/hif_rx.c
@@ -0,0 +1,415 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Handling of the chip-to-host events (aka indications) of the hardware API.
+ *
+ * Copyright (c) 2017-2020, Silicon Laboratories, Inc.
+ * Copyright (c) 2010, ST-Ericsson
+ */
+#include <linux/skbuff.h>
+#include <linux/etherdevice.h>
+
+#include "hif_rx.h"
+#include "wfx.h"
+#include "scan.h"
+#include "bh.h"
+#include "sta.h"
+#include "data_rx.h"
+#include "hif_api_cmd.h"
+
+static int hif_generic_confirm(struct wfx_dev *wdev,
+			       const struct hif_msg *hif, const void *buf)
+{
+	/* All confirm messages start with status */
+	int status = le32_to_cpup((__le32 *)buf);
+	int cmd = hif->id;
+	int len = le16_to_cpu(hif->len) - 4; /* drop header */
+
+	WARN(!mutex_is_locked(&wdev->hif_cmd.lock), "data locking error");
+
+	if (!wdev->hif_cmd.buf_send) {
+		dev_warn(wdev->dev, "unexpected confirmation: 0x%.2x\n", cmd);
+		return -EINVAL;
+	}
+
+	if (cmd != wdev->hif_cmd.buf_send->id) {
+		dev_warn(wdev->dev,
+			 "chip response mismatch request: 0x%.2x vs 0x%.2x\n",
+			 cmd, wdev->hif_cmd.buf_send->id);
+		return -EINVAL;
+	}
+
+	if (wdev->hif_cmd.buf_recv) {
+		if (wdev->hif_cmd.len_recv >= len && len > 0)
+			memcpy(wdev->hif_cmd.buf_recv, buf, len);
+		else
+			status = -EIO;
+	}
+	wdev->hif_cmd.ret = status;
+
+	complete(&wdev->hif_cmd.done);
+	return status;
+}
+
+static int hif_tx_confirm(struct wfx_dev *wdev,
+			  const struct hif_msg *hif, const void *buf)
+{
+	const struct hif_cnf_tx *body = buf;
+
+	wfx_tx_confirm_cb(wdev, body);
+	return 0;
+}
+
+static int hif_multi_tx_confirm(struct wfx_dev *wdev,
+				const struct hif_msg *hif, const void *buf)
+{
+	const struct hif_cnf_multi_transmit *body = buf;
+	int i;
+
+	WARN(body->num_tx_confs <= 0, "corrupted message");
+	for (i = 0; i < body->num_tx_confs; i++)
+		wfx_tx_confirm_cb(wdev, &body->tx_conf_payload[i]);
+	return 0;
+}
+
+static int hif_startup_indication(struct wfx_dev *wdev,
+				  const struct hif_msg *hif, const void *buf)
+{
+	const struct hif_ind_startup *body = buf;
+
+	if (body->status || body->firmware_type > 4) {
+		dev_err(wdev->dev, "received invalid startup indication");
+		return -EINVAL;
+	}
+	memcpy(&wdev->hw_caps, body, sizeof(struct hif_ind_startup));
+	le16_to_cpus((__le16 *)&wdev->hw_caps.hardware_id);
+	le16_to_cpus((__le16 *)&wdev->hw_caps.num_inp_ch_bufs);
+	le16_to_cpus((__le16 *)&wdev->hw_caps.size_inp_ch_buf);
+	le32_to_cpus((__le32 *)&wdev->hw_caps.supported_rate_mask);
+
+	complete(&wdev->firmware_ready);
+	return 0;
+}
+
+static int hif_wakeup_indication(struct wfx_dev *wdev,
+				 const struct hif_msg *hif, const void *buf)
+{
+	if (!wdev->pdata.gpio_wakeup ||
+	    gpiod_get_value(wdev->pdata.gpio_wakeup) == 0) {
+		dev_warn(wdev->dev, "unexpected wake-up indication\n");
+		return -EIO;
+	}
+	return 0;
+}
+
+static int hif_receive_indication(struct wfx_dev *wdev,
+				  const struct hif_msg *hif,
+				  const void *buf, struct sk_buff *skb)
+{
+	struct wfx_vif *wvif = wdev_to_wvif(wdev, hif->interface);
+	const struct hif_ind_rx *body = buf;
+
+	if (!wvif) {
+		dev_warn(wdev->dev, "%s: received event for non-existent vif\n", __func__);
+		return -EIO;
+	}
+	skb_pull(skb, sizeof(struct hif_msg) + sizeof(struct hif_ind_rx));
+	wfx_rx_cb(wvif, body, skb);
+
+	return 0;
+}
+
+static int hif_event_indication(struct wfx_dev *wdev,
+				const struct hif_msg *hif, const void *buf)
+{
+	struct wfx_vif *wvif = wdev_to_wvif(wdev, hif->interface);
+	const struct hif_ind_event *body = buf;
+	int type = le32_to_cpu(body->event_id);
+
+	if (!wvif) {
+		dev_warn(wdev->dev, "%s: received event for non-existent vif\n", __func__);
+		return -EIO;
+	}
+
+	switch (type) {
+	case HIF_EVENT_IND_RCPI_RSSI:
+		wfx_event_report_rssi(wvif, body->event_data.rcpi_rssi);
+		break;
+	case HIF_EVENT_IND_BSSLOST:
+		schedule_delayed_work(&wvif->beacon_loss_work, 0);
+		break;
+	case HIF_EVENT_IND_BSSREGAINED:
+		cancel_delayed_work(&wvif->beacon_loss_work);
+		dev_dbg(wdev->dev, "ignore BSSREGAINED indication\n");
+		break;
+	case HIF_EVENT_IND_PS_MODE_ERROR:
+		dev_warn(wdev->dev, "error while processing power save request: %d\n",
+			 le32_to_cpu(body->event_data.ps_mode_error));
+		break;
+	default:
+		dev_warn(wdev->dev, "unhandled event indication: %.2x\n",
+			 type);
+		break;
+	}
+	return 0;
+}
+
+static int hif_pm_mode_complete_indication(struct wfx_dev *wdev,
+					   const struct hif_msg *hif,
+					   const void *buf)
+{
+	struct wfx_vif *wvif = wdev_to_wvif(wdev, hif->interface);
+
+	if (!wvif) {
+		dev_warn(wdev->dev, "%s: received event for non-existent vif\n", __func__);
+		return -EIO;
+	}
+	complete(&wvif->set_pm_mode_complete);
+
+	return 0;
+}
+
+static int hif_scan_complete_indication(struct wfx_dev *wdev,
+					const struct hif_msg *hif,
+					const void *buf)
+{
+	struct wfx_vif *wvif = wdev_to_wvif(wdev, hif->interface);
+	const struct hif_ind_scan_cmpl *body = buf;
+
+	if (!wvif) {
+		dev_warn(wdev->dev, "%s: received event for non-existent vif\n", __func__);
+		return -EIO;
+	}
+
+	wfx_scan_complete(wvif, body->num_channels_completed);
+
+	return 0;
+}
+
+static int hif_join_complete_indication(struct wfx_dev *wdev,
+					const struct hif_msg *hif,
+					const void *buf)
+{
+	struct wfx_vif *wvif = wdev_to_wvif(wdev, hif->interface);
+
+	if (!wvif) {
+		dev_warn(wdev->dev, "%s: received event for non-existent vif\n", __func__);
+		return -EIO;
+	}
+	dev_warn(wdev->dev, "unattended JoinCompleteInd\n");
+
+	return 0;
+}
+
+static int hif_suspend_resume_indication(struct wfx_dev *wdev,
+					 const struct hif_msg *hif,
+					 const void *buf)
+{
+	const struct hif_ind_suspend_resume_tx *body = buf;
+	struct wfx_vif *wvif;
+
+	if (body->bc_mc_only) {
+		wvif = wdev_to_wvif(wdev, hif->interface);
+		if (!wvif) {
+			dev_warn(wdev->dev, "%s: received event for non-existent vif\n", __func__);
+			return -EIO;
+		}
+		if (body->resume)
+			wfx_suspend_resume_mc(wvif, STA_NOTIFY_AWAKE);
+		else
+			wfx_suspend_resume_mc(wvif, STA_NOTIFY_SLEEP);
+	} else {
+		WARN(body->peer_sta_set, "misunderstood indication");
+		WARN(hif->interface != 2, "misunderstood indication");
+		if (body->resume)
+			wfx_suspend_hot_dev(wdev, STA_NOTIFY_AWAKE);
+		else
+			wfx_suspend_hot_dev(wdev, STA_NOTIFY_SLEEP);
+	}
+
+	return 0;
+}
+
+static int hif_generic_indication(struct wfx_dev *wdev,
+				  const struct hif_msg *hif, const void *buf)
+{
+	const struct hif_ind_generic *body = buf;
+	int type = le32_to_cpu(body->type);
+
+	switch (type) {
+	case HIF_GENERIC_INDICATION_TYPE_RAW:
+		return 0;
+	case HIF_GENERIC_INDICATION_TYPE_STRING:
+		dev_info(wdev->dev, "firmware says: %s\n", (char *)&body->data);
+		return 0;
+	case HIF_GENERIC_INDICATION_TYPE_RX_STATS:
+		mutex_lock(&wdev->rx_stats_lock);
+		/* Older firmware send a generic indication beside RxStats */
+		if (!wfx_api_older_than(wdev, 1, 4))
+			dev_info(wdev->dev, "Rx test ongoing. Temperature: %d degrees C\n",
+				 body->data.rx_stats.current_temp);
+		memcpy(&wdev->rx_stats, &body->data.rx_stats,
+		       sizeof(wdev->rx_stats));
+		mutex_unlock(&wdev->rx_stats_lock);
+		return 0;
+	case HIF_GENERIC_INDICATION_TYPE_TX_POWER_LOOP_INFO:
+		mutex_lock(&wdev->tx_power_loop_info_lock);
+		memcpy(&wdev->tx_power_loop_info,
+		       &body->data.tx_power_loop_info,
+		       sizeof(wdev->tx_power_loop_info));
+		mutex_unlock(&wdev->tx_power_loop_info_lock);
+		return 0;
+	default:
+		dev_err(wdev->dev, "generic_indication: unknown indication type: %#.8x\n",
+			type);
+		return -EIO;
+	}
+}
+
+static const struct {
+	int val;
+	const char *str;
+	bool has_param;
+} hif_errors[] = {
+	{ HIF_ERROR_FIRMWARE_ROLLBACK,
+		"rollback status" },
+	{ HIF_ERROR_FIRMWARE_DEBUG_ENABLED,
+		"debug feature enabled" },
+	{ HIF_ERROR_PDS_PAYLOAD,
+		"PDS version is not supported" },
+	{ HIF_ERROR_PDS_TESTFEATURE,
+		"PDS ask for an unknown test mode" },
+	{ HIF_ERROR_OOR_VOLTAGE,
+		"out-of-range power supply voltage", true },
+	{ HIF_ERROR_OOR_TEMPERATURE,
+		"out-of-range temperature", true },
+	{ HIF_ERROR_SLK_REQ_DURING_KEY_EXCHANGE,
+		"secure link does not expect request during key exchange" },
+	{ HIF_ERROR_SLK_SESSION_KEY,
+		"secure link session key is invalid" },
+	{ HIF_ERROR_SLK_OVERFLOW,
+		"secure link overflow" },
+	{ HIF_ERROR_SLK_WRONG_ENCRYPTION_STATE,
+		"secure link messages list does not match message encryption" },
+	{ HIF_ERROR_SLK_UNCONFIGURED,
+		"secure link not yet configured" },
+	{ HIF_ERROR_HIF_BUS_FREQUENCY_TOO_LOW,
+		"bus clock is too slow (<1kHz)" },
+	{ HIF_ERROR_HIF_RX_DATA_TOO_LARGE,
+		"HIF message too large" },
+	/* Following errors only exists in old firmware versions: */
+	{ HIF_ERROR_HIF_TX_QUEUE_FULL,
+		"HIF messages queue is full" },
+	{ HIF_ERROR_HIF_BUS,
+		"HIF bus" },
+	{ HIF_ERROR_SLK_MULTI_TX_UNSUPPORTED,
+		"secure link does not support multi-tx confirmations" },
+	{ HIF_ERROR_SLK_OUTDATED_SESSION_KEY,
+		"secure link session key is outdated" },
+	{ HIF_ERROR_SLK_DECRYPTION,
+		"secure link params (nonce or tag) mismatch" },
+};
+
+static int hif_error_indication(struct wfx_dev *wdev,
+				const struct hif_msg *hif, const void *buf)
+{
+	const struct hif_ind_error *body = buf;
+	int type = le32_to_cpu(body->type);
+	int param = (s8)body->data[0];
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(hif_errors); i++)
+		if (type == hif_errors[i].val)
+			break;
+	if (i < ARRAY_SIZE(hif_errors))
+		if (hif_errors[i].has_param)
+			dev_err(wdev->dev, "asynchronous error: %s: %d\n",
+				hif_errors[i].str, param);
+		else
+			dev_err(wdev->dev, "asynchronous error: %s\n",
+				hif_errors[i].str);
+	else
+		dev_err(wdev->dev, "asynchronous error: unknown: %08x\n", type);
+	print_hex_dump(KERN_INFO, "hif: ", DUMP_PREFIX_OFFSET,
+		       16, 1, hif, le16_to_cpu(hif->len), false);
+	wdev->chip_frozen = true;
+
+	return 0;
+};
+
+static int hif_exception_indication(struct wfx_dev *wdev,
+				    const struct hif_msg *hif, const void *buf)
+{
+	const struct hif_ind_exception *body = buf;
+	int type = le32_to_cpu(body->type);
+
+	if (type == 4)
+		dev_err(wdev->dev, "firmware assert %d\n",
+			le32_to_cpup((__le32 *)body->data));
+	else
+		dev_err(wdev->dev, "firmware exception\n");
+	print_hex_dump(KERN_INFO, "hif: ", DUMP_PREFIX_OFFSET,
+		       16, 1, hif, le16_to_cpu(hif->len), false);
+	wdev->chip_frozen = true;
+
+	return -1;
+}
+
+static const struct {
+	int msg_id;
+	int (*handler)(struct wfx_dev *wdev,
+		       const struct hif_msg *hif, const void *buf);
+} hif_handlers[] = {
+	/* Confirmations */
+	{ HIF_CNF_ID_TX,                   hif_tx_confirm },
+	{ HIF_CNF_ID_MULTI_TRANSMIT,       hif_multi_tx_confirm },
+	/* Indications */
+	{ HIF_IND_ID_STARTUP,              hif_startup_indication },
+	{ HIF_IND_ID_WAKEUP,               hif_wakeup_indication },
+	{ HIF_IND_ID_JOIN_COMPLETE,        hif_join_complete_indication },
+	{ HIF_IND_ID_SET_PM_MODE_CMPL,     hif_pm_mode_complete_indication },
+	{ HIF_IND_ID_SCAN_CMPL,            hif_scan_complete_indication },
+	{ HIF_IND_ID_SUSPEND_RESUME_TX,    hif_suspend_resume_indication },
+	{ HIF_IND_ID_EVENT,                hif_event_indication },
+	{ HIF_IND_ID_GENERIC,              hif_generic_indication },
+	{ HIF_IND_ID_ERROR,                hif_error_indication },
+	{ HIF_IND_ID_EXCEPTION,            hif_exception_indication },
+	/* FIXME: allocate skb_p from hif_receive_indication and make it generic */
+	//{ HIF_IND_ID_RX,                 hif_receive_indication },
+};
+
+void wfx_handle_rx(struct wfx_dev *wdev, struct sk_buff *skb)
+{
+	int i;
+	const struct hif_msg *hif = (const struct hif_msg *)skb->data;
+	int hif_id = hif->id;
+
+	if (hif_id == HIF_IND_ID_RX) {
+		/* hif_receive_indication take care of skb lifetime */
+		hif_receive_indication(wdev, hif, hif->body, skb);
+		return;
+	}
+	/* Note: mutex_is_lock cause an implicit memory barrier that protect
+	 * buf_send
+	 */
+	if (mutex_is_locked(&wdev->hif_cmd.lock) &&
+	    wdev->hif_cmd.buf_send &&
+	    wdev->hif_cmd.buf_send->id == hif_id) {
+		hif_generic_confirm(wdev, hif, hif->body);
+		goto free;
+	}
+	for (i = 0; i < ARRAY_SIZE(hif_handlers); i++) {
+		if (hif_handlers[i].msg_id == hif_id) {
+			if (hif_handlers[i].handler)
+				hif_handlers[i].handler(wdev, hif, hif->body);
+			goto free;
+		}
+	}
+	if (hif_id & 0x80)
+		dev_err(wdev->dev, "unsupported HIF indication: ID %02x\n",
+			hif_id);
+	else
+		dev_err(wdev->dev, "unexpected HIF confirmation: ID %02x\n",
+			hif_id);
+free:
+	dev_kfree_skb(skb);
+}
diff --git a/drivers/net/wireless/silabs/wfx/hif_rx.h b/drivers/net/wireless/silabs/wfx/hif_rx.h
new file mode 100644
index 000000000000..96543b81fa77
--- /dev/null
+++ b/drivers/net/wireless/silabs/wfx/hif_rx.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Handling of the chip-to-host events (aka indications) of the hardware API.
+ *
+ * Copyright (c) 2017-2019, Silicon Laboratories, Inc.
+ * Copyright (c) 2010, ST-Ericsson
+ * Copyright (C) 2010, ST-Ericsson SA
+ */
+#ifndef WFX_HIF_RX_H
+#define WFX_HIF_RX_H
+
+struct wfx_dev;
+struct sk_buff;
+
+void wfx_handle_rx(struct wfx_dev *wdev, struct sk_buff *skb);
+
+#endif
-- 
2.33.0

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