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Subject[PATCH 14/23] wfx: add hif_rx.c/hif_rx.h
Date
From: Jérôme Pouiller <jerome.pouiller@silabs.com>

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
---
drivers/net/wireless/silabs/wfx/hif_rx.c | 415 +++++++++++++++++++++++
drivers/net/wireless/silabs/wfx/hif_rx.h | 18 +
2 files changed, 433 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..56a5f891447b
--- /dev/null
+++ b/drivers/net/wireless/silabs/wfx/hif_rx.c
@@ -0,0 +1,415 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Implementation of chip-to-host event (aka indications) of WFxxx Split Mac
+ * (WSM) 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: ignore rx data for non-existent vif %d\n",
+ __func__, hif->interface);
+ 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);
+
+ if (!wvif) {
+ dev_warn(wdev->dev, "%s: received event for non-existent vif\n", __func__);
+ return -EIO;
+ }
+
+ wfx_scan_complete(wvif);
+
+ 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..f07c10c8c6bd
--- /dev/null
+++ b/drivers/net/wireless/silabs/wfx/hif_rx.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Implementation of chip-to-host event (aka indications) of WFxxx Split Mac
+ * (WSM) 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
--
2.28.0
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