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esp32_wlan.c
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esp32_wlan.c
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/****************************************************************************
* arch/xtensa/src/esp32/esp32_wlan.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#ifdef CONFIG_ESP32_WIRELESS
#include <queue.h>
#include <errno.h>
#include <debug.h>
#include <crc64.h>
#include <arpa/inet.h>
#include <nuttx/nuttx.h>
#include <nuttx/arch.h>
#include <nuttx/irq.h>
#include <nuttx/wdog.h>
#include <nuttx/wqueue.h>
#include <nuttx/net/arp.h>
#include <nuttx/net/netdev.h>
#if defined(CONFIG_NET_PKT)
# include <nuttx/net/pkt.h>
#endif
#include "esp32_wifi_adapter.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* WLAN station device ID */
#define WLAN_STA_DEVNO (0)
/* TX poll delay = 1 seconds.
* CLK_TCK is the number of clock ticks per second
*/
#define WLAN_WDDELAY (1 * CLK_TCK)
/* TX timeout = 1 minute */
#define WLAN_TXTOUT (60 * CLK_TCK)
/* Low-priority work queue processes RX/TX */
#define WLAN_WORK LPWORK
/* Ethernet frame:
* Resource address : 6 bytes
* Destination address: 6 bytes
* Type : 2 bytes
* Payload : MAX 1500
* Checksum : Ignore
*
* Total size : 1514
*/
#define WLAN_BUF_SIZE (CONFIG_NET_ETH_PKTSIZE)
/* WiFi receive buffer number */
#define WLAN_RXBUF_NUM (CONFIG_ESP32_WLAN_RXBUF_NUM)
/* Receive threshold which allows the receive function to trigger a scheduler
* to activate the application if possible.
*/
#ifdef CONFIG_MM_IOB
# define IOBBUF_SIZE (CONFIG_IOB_NBUFFERS * CONFIG_IOB_BUFSIZE)
# if (IOBBUF_SIZE) > (WLAN_BUF_SIZE + 1)
# define WLAN_RX_THRESHOLD (IOBBUF_SIZE - WLAN_BUF_SIZE + 1)
# endif
#endif
/****************************************************************************
* Private Types
****************************************************************************/
/* Receive buffer */
struct wlan_rxbuf
{
sq_entry_t entry; /* Queue entry */
/* Packet data buffer */
uint8_t buffer[WLAN_BUF_SIZE];
uint16_t len; /* Packet data length */
};
/* The wlan_priv_s encapsulates all state information for a single
* hardware interface
*/
struct wlan_priv_s
{
bool ifup; /* true:ifup false:ifdown */
struct wdog_s txpoll; /* TX poll timer */
struct wdog_s txtimeout; /* TX timeout timer */
struct work_s rxwork; /* Send packet work */
struct work_s txwork; /* Receive packet work */
struct work_s pollwork; /* Poll work */
struct work_s toutwork; /* Send packet timeout work */
/* This holds the information visible to the NuttX network */
struct net_driver_s dev;
/* TX buffer */
uint8_t txbuf[WLAN_BUF_SIZE];
/* Rest of the data in the TX buffer that need to be sent */
uint8_t txrst;
/* RX buffer cache */
struct wlan_rxbuf rxbuf[WLAN_RXBUF_NUM];
/* RX buffer queue */
sq_queue_t rxb;
/* Free buffer queue */
sq_queue_t freeb;
};
/****************************************************************************
* Private Data
****************************************************************************/
static struct wlan_priv_s g_wlan_priv;
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Common TX logic */
static int wlan_transmit(FAR struct wlan_priv_s *priv);
static void wlan_rxpoll(FAR void *arg);
static int wlan_txpoll(FAR struct net_driver_s *dev);
static void wlan_dopoll(FAR struct wlan_priv_s *priv);
/* Watchdog timer expirations */
static void wlan_txtimeout_work(FAR void *arg);
static void wlan_txtimeout_expiry(wdparm_t arg);
static void wlan_poll_work(FAR void *arg);
static void wlan_poll_expiry(wdparm_t arg);
/* NuttX callback functions */
static int wlan_ifup(struct net_driver_s *dev);
static int wlan_ifdown(struct net_driver_s *dev);
static void wlan_txavail_work(FAR void *arg);
static int wlan_txavail(struct net_driver_s *dev);
#if defined(CONFIG_NET_MCASTGROUP) || defined(CONFIG_NET_ICMPv6)
static int wlan_addmac(struct net_driver_s *dev, FAR const uint8_t *mac);
#endif
#ifdef CONFIG_NET_MCASTGROUP
static int wlan_rmmac(struct net_driver_s *dev, FAR const uint8_t *mac);
#endif
#ifdef CONFIG_NETDEV_IOCTL
static int wlan_ioctl(struct net_driver_s *dev, int cmd,
unsigned long arg);
#endif
static void wlan_tx_done(uint8_t ifidx, uint8_t *data,
uint16_t *len, bool txstatus);
static int wlan_rx_done(void *buffer, uint16_t len, void *eb);
static int esp32_net_initialize(unsigned int devno);
/****************************************************************************
* Private Functions
****************************************************************************/
/* Note:
* All TX done/RX done/Error trigger functions are not called from
* interrupts, this is much different from ethernet driver, including:
* * wlan_rx_done
* * wlan_tx_done
*
* These functions are called in a WiFi private thread. So we just use
* mutex/semaphore instead of disable interrupt, if necessary.
*/
/****************************************************************************
* Function: wlan_init_buffer
*
* Description:
* Initialize the free buffer list
*
* Input Parameters:
* priv - Reference to the driver state structure
*
* Returned Value:
* None
*
****************************************************************************/
static inline void wlan_init_buffer(struct wlan_priv_s *priv)
{
int i;
irqstate_t flags;
flags = enter_critical_section();
priv->txrst = 0;
priv->dev.d_buf = NULL;
priv->dev.d_len = 0;
sq_init(&priv->freeb);
sq_init(&priv->rxb);
for (i = 0; i < WLAN_RXBUF_NUM; i++)
{
sq_addlast(&priv->rxbuf[i].entry, &priv->freeb);
}
leave_critical_section(flags);
}
/****************************************************************************
* Function: wlan_alloc_buffer
*
* Description:
* Allocate one buffer from the free buffer queue
*
* Input Parameters:
* priv - Reference to the driver state structure
*
* Returned Value:
* Pointer to the allocated buffer on success; NULL on failure
*
****************************************************************************/
static inline struct wlan_rxbuf *wlan_alloc_buffer(struct wlan_priv_s *priv)
{
sq_entry_t *entry;
irqstate_t flags;
struct wlan_rxbuf *rxbuf = NULL;
flags = enter_critical_section();
entry = sq_remfirst(&priv->freeb);
if (entry)
{
rxbuf = container_of(entry, struct wlan_rxbuf, entry);
}
leave_critical_section(flags);
return rxbuf;
}
/****************************************************************************
* Function: wlan_free_buffer
*
* Description:
* Insert a free Rx buffer into the free queue
*
* Input Parameters:
* priv - Reference to the driver state structure
* buffer - A pointer to the buffer to be freed
*
* Returned Value:
* None
*
****************************************************************************/
static inline void wlan_free_buffer(struct wlan_priv_s *priv,
uint8_t *buffer)
{
struct wlan_rxbuf *rxbuf;
irqstate_t flags;
flags = enter_critical_section();
rxbuf = container_of(buffer, struct wlan_rxbuf, buffer);
sq_addlast(&rxbuf->entry, &priv->freeb);
leave_critical_section(flags);
}
/****************************************************************************
* Name: wifi_tx_available
*
* Description:
* Check if WiFi can send data. This function will re-send the rest of the
* data that we failed to send.
*
* Input Parameters:
* priv - Reference to the driver state structure
*
* Returned Value:
* true if available or false if unavailable
*
****************************************************************************/
static bool wifi_tx_available(FAR struct wlan_priv_s *priv)
{
int ret;
if (priv->txrst)
{
ret = esp_wifi_sta_send_data(priv->txbuf, priv->txrst);
if (ret)
{
ninfo("ERROR: Failed to transmit the rest of the frame\n");
return false;
}
else
{
priv->txrst = 0;
}
}
return true;
}
/****************************************************************************
* Name: wlan_transmit
*
* Description:
* Send the data to WiFi driver. If this sending fails, cache the data
* and re-send it when TX done callback or timer poll function triggers.
*
* Input Parameters:
* priv - Reference to the driver state structure
*
* Returned Value:
* OK on success; a negated errno on failure
*
****************************************************************************/
static int wlan_transmit(FAR struct wlan_priv_s *priv)
{
int ret;
struct net_driver_s *dev = &priv->dev;
void *buffer = dev->d_buf;
uint32_t len = dev->d_len;
if (!wifi_tx_available(priv))
{
return -ENOBUFS;
}
ret = esp_wifi_sta_send_data(buffer, len);
if (ret)
{
priv->txrst = len;
if (buffer != priv->txbuf)
{
memcpy(priv->txbuf, buffer, len);
}
wd_start(&priv->txtimeout, WLAN_TXTOUT,
wlan_txtimeout_expiry, (uint32_t)priv);
return -EIO;
}
else
{
priv->txrst = 0;
}
return OK;
}
/****************************************************************************
* Function: wlan_recvframe
*
* Description:
* Try to receive RX buffer from RX done buffer queue.
*
* Input Parameters:
* priv - Reference to the driver state structure
*
* Returned Value:
* RX buffer if success or NULl if no buffer in queue.
*
****************************************************************************/
static struct wlan_rxbuf *wlan_recvframe(FAR struct wlan_priv_s *priv)
{
irqstate_t flags;
sq_entry_t *entry;
struct wlan_rxbuf *rxbuf = NULL;
flags = enter_critical_section();
entry = sq_remfirst(&priv->rxb);
if (entry)
{
rxbuf = container_of(entry, struct wlan_rxbuf, entry);
}
leave_critical_section(flags);
return rxbuf;
}
/****************************************************************************
* Name: wlan_tx_done
*
* Description:
* WiFi TX done callback function. If this is called, it means sending
* next packet.
*
* Input Parameters:
* ifidx - The interface id that the tx callback has been triggered from.
* data - Pointer to the data transmitted.
* len - Length of the data transmitted.
* status - True if data was transmitted successfully or false if failed.
*
* Returned Value:
* None
*
****************************************************************************/
static void wlan_tx_done(uint8_t ifidx, uint8_t *data,
uint16_t *len, bool status)
{
FAR struct wlan_priv_s *priv = &g_wlan_priv;
wd_cancel(&priv->txtimeout);
wlan_txavail(&priv->dev);
}
/****************************************************************************
* Function: wlan_rx_done
*
* Description:
* WiFi RX done callback function. If this is called, it means receiving
* packet.
*
* Input Parameters:
* buffer - WiFi received packet buffer
* len - Length of received packet
* eb - WiFi receive callback input eb pointer
*
* Returned Value:
* 0 on success or a negated errno on failure
*
****************************************************************************/
static int wlan_rx_done(void *buffer, uint16_t len, void *eb)
{
struct wlan_rxbuf *rxbuf;
irqstate_t flags;
FAR struct wlan_priv_s *priv = &g_wlan_priv;
int ret = 0;
if (!priv->ifup)
{
goto out;
}
if (len > WLAN_BUF_SIZE)
{
nwarn("ERROR: Wlan receive %d larger than %d\n",
len, WLAN_BUF_SIZE);
ret = -EINVAL;
goto out;
}
rxbuf = wlan_alloc_buffer(priv);
if (!rxbuf)
{
ret = -ENOBUFS;
goto out;
}
memcpy(rxbuf->buffer, buffer, len);
rxbuf->len = len;
if (eb)
{
esp_wifi_free_eb(eb);
}
flags = enter_critical_section();
sq_addlast(&rxbuf->entry, &priv->rxb);
leave_critical_section(flags);
if (work_available(&priv->rxwork))
{
work_queue(WLAN_WORK, &priv->rxwork, wlan_rxpoll, priv, 0);
}
return 0;
out:
if (eb)
{
esp_wifi_free_eb(eb);
}
return ret;
}
/****************************************************************************
* Function: wlan_rxpoll
*
* Description:
* Try to receive packets from RX done queue and pass packets into IP
* stack and send packets which is from IP stack if necessary.
*
* Input Parameters:
* priv - Reference to the driver state structure
*
* Returned Value:
* None
*
****************************************************************************/
static void wlan_rxpoll(FAR void *arg)
{
struct wlan_rxbuf *rxbuf;
struct eth_hdr_s *eth_hdr;
FAR struct wlan_priv_s *priv = (FAR struct wlan_priv_s *)arg;
FAR struct net_driver_s *dev = &priv->dev;
#ifdef WLAN_RX_THRESHOLD
uint32_t rbytes = 0;
#endif
/* Loop while while wlan_recvframe() successfully retrieves valid
* Ethernet frames.
*/
net_lock();
while ((rxbuf = wlan_recvframe(priv)) != NULL)
{
dev->d_buf = rxbuf->buffer;
dev->d_len = rxbuf->len;
#ifdef WLAN_RX_THRESHOLD
rbytes += rxbuf->len;
#endif
#ifdef CONFIG_NET_PKT
/* When packet sockets are enabled,
* feed the frame into the packet tap.
*/
pkt_input(&priv->dev);
#endif
/* Check if the packet is a valid size for the network
* buffer configuration (this should not happen)
*/
if (dev->d_len > WLAN_BUF_SIZE)
{
nwarn("WARNING: DROPPED Too big: %d\n", dev->d_len);
/* Free dropped packet buffer */
if (dev->d_buf)
{
wlan_free_buffer(priv, dev->d_buf);
dev->d_buf = NULL;
dev->d_len = 0;
}
continue;
}
eth_hdr = (struct eth_hdr_s *)dev->d_buf;
/* We only accept IP packets of the configured type and ARP packets */
#ifdef CONFIG_NET_IPv4
if (eth_hdr->type == HTONS(ETHTYPE_IP))
{
ninfo("IPv4 frame\n");
/* Handle ARP on input then give the IPv4 packet to the network
* layer
*/
arp_ipin(&priv->dev);
ipv4_input(&priv->dev);
/* If the above function invocation resulted in data
* that should be sent out on the network,
* the field d_len will set to a value > 0.
*/
if (priv->dev.d_len > 0)
{
/* Update the Ethernet header with the correct MAC address */
#ifdef CONFIG_NET_IPv6
if (IFF_IS_IPv4(priv->dev.d_flags))
#endif
{
arp_out(&priv->dev);
}
#ifdef CONFIG_NET_IPv6
else
{
neighbor_out(&priv->dev);
}
#endif
/* And send the packet */
wlan_transmit(priv);
}
}
else
#endif
#ifdef CONFIG_NET_IPv6
if (eth_hdr->type == HTONS(ETHTYPE_IP6))
{
ninfo("IPv6 frame\n");
/* Give the IPv6 packet to the network layer */
ipv6_input(&priv->dev);
/* If the above function invocation resulted in data
* that should be sent out on the network, the field
* d_len will set to a value > 0.
*/
if (priv->dev.d_len > 0)
{
/* Update the Ethernet header with the correct MAC address */
#ifdef CONFIG_NET_IPv4
if (IFF_IS_IPv4(priv->dev.d_flags))
{
arp_out(&priv->dev);
}
else
#endif
#ifdef CONFIG_NET_IPv6
{
neighbor_out(&priv->dev);
}
#endif
/* And send the packet */
wlan_transmit(priv);
}
}
else
#endif
#ifdef CONFIG_NET_ARP
if (eth_hdr->type == htons(ETHTYPE_ARP))
{
ninfo("ARP frame\n");
/* Handle ARP packet */
arp_arpin(&priv->dev);
/* If the above function invocation resulted in data
* that should be sent out on the network, the field
* d_len will set to a value > 0.
*/
if (priv->dev.d_len > 0)
{
wlan_transmit(priv);
}
}
else
#endif
{
ninfo("INFO: Dropped, Unknown type: %04x\n", eth_hdr->type);
}
/* We are finished with the RX buffer. NOTE: If the buffer is
* re-used for transmission, the dev->d_buf field will have been
* nullified.
*/
if (dev->d_buf)
{
/* Free the receive packet buffer */
wlan_free_buffer(priv, dev->d_buf);
dev->d_buf = NULL;
dev->d_len = 0;
}
#ifdef WLAN_RX_THRESHOLD
/**
* If received total bytes is larger than receive threshold,
* then do "unlock" to try to active applicantion to receive
* data from low-level buffer of IP stack.
*/
if (rbytes >= WLAN_RX_THRESHOLD)
{
net_unlock();
rbytes = 0;
net_lock();
}
#endif
}
net_unlock();
}
/****************************************************************************
* Name: wlan_txpoll
*
* Description:
* The transmitter is available, check if the network has any outgoing
* packets ready to send. This is a callback from devif_poll().
* devif_poll() may be called:
*
* 1. When the preceding TX packet send times out and the interface is
* reset
* 2. During normal TX polling
*
* Input Parameters:
* dev - Reference to the NuttX driver state structure
*
* Returned Value:
* OK on success; a negated errno on failure
*
****************************************************************************/
static int wlan_txpoll(FAR struct net_driver_s *dev)
{
FAR struct wlan_priv_s *priv = (FAR struct wlan_priv_s *)dev->d_private;
DEBUGASSERT(dev->d_buf != NULL);
/* If the polling resulted in data that should be sent out on the network,
* the field d_len is set to a value > 0.
*/
if (dev->d_len > 0)
{
/* Look up the destination MAC address and add it to the Ethernet
* header.
*/
#ifdef CONFIG_NET_IPv4
#ifdef CONFIG_NET_IPv6
if (IFF_IS_IPv4(dev->d_flags))
#endif
{
arp_out(dev);
}
#endif /* CONFIG_NET_IPv4 */
#ifdef CONFIG_NET_IPv6
#ifdef CONFIG_NET_IPv4
else
#endif
{
neighbor_out(dev);
}
#endif /* CONFIG_NET_IPv6 */
int ret = wlan_transmit(priv);
if (ret)
{
return -EBUSY;
}
}
/* If zero is returned, the polling will continue until
* all connections have been examined.
*/
return OK;
}
/****************************************************************************
* Function: wlan_dopoll
*
* Description:
* The function is called in order to perform an out-of-sequence TX poll.
* This is done:
*
* 1. When new TX data is available (wlan_txavail)
* 2. After a TX timeout to restart the sending process
* (wlan_txtimeout_expiry).
*
* Input Parameters:
* priv - Reference to the driver state structure
*
* Returned Value:
* None
*
****************************************************************************/
static void wlan_dopoll(FAR struct wlan_priv_s *priv)
{
FAR struct net_driver_s *dev = &priv->dev;
if (!wifi_tx_available(priv))
{
return ;
}
dev->d_buf = priv->txbuf;
/* If so, then poll the network for new XMIT data */
devif_timer(dev, 0, wlan_txpoll);
dev->d_buf = NULL;
}
/****************************************************************************
* Function: wlan_txtimeout_work
*
* Description:
* Perform TX timeout related work from the worker thread
*
* Input Parameters:
* arg - The argument passed when work_queue() as called.
*
* Returned Value:
* OK on success
*
****************************************************************************/
static void wlan_txtimeout_work(void *arg)
{
struct wlan_priv_s *priv = (struct wlan_priv_s *)arg;
net_lock();
wlan_ifdown(&priv->dev);
wlan_ifup(&priv->dev);
/* Then poll for new XMIT data */
wlan_dopoll(priv);
net_unlock();
}
/****************************************************************************
* Function: wlan_txtimeout_expiry
*
* Description:
* Our TX watchdog timed out. Called from the timer callback handler.
* The last TX never completed. Reset the hardware and start again.
*
* Input Parameters:
* argc - The number of available arguments
* arg - The first argument
*
* Returned Value:
* None
*
****************************************************************************/
static void wlan_txtimeout_expiry(wdparm_t arg)
{
struct wlan_priv_s *priv = (struct wlan_priv_s *)arg;
/* Schedule to perform the TX timeout processing on the worker thread. */
if (work_available(&priv->toutwork))
{
work_queue(WLAN_WORK, &priv->toutwork, wlan_txtimeout_work, priv, 0);
}
}
/****************************************************************************
* Name: wlan_poll_work
*
* Description:
* Perform periodic polling from the worker thread
*
* Input Parameters:
* arg - The argument passed when work_queue() as called.
*
* Returned Value:
* OK on success
*
* Assumptions:
* The network is locked.
*
****************************************************************************/
static void wlan_poll_work(FAR void *arg)
{
int32_t delay = WLAN_WDDELAY;
FAR struct wlan_priv_s *priv = (FAR struct wlan_priv_s *)arg;
struct net_driver_s *dev = &priv->dev;
/* Lock the network and serialize driver operations if necessary.
* NOTE: Serialization is only required in the case where the driver work
* is performed on an LP worker thread and where more than one LP worker
* thread has been configured.
*/
net_lock();
/* Check if there is room in the send another TX packet. We cannot perform
* the TX poll if he are unable to accept another packet for transmission.
*
* If there is no room, we should reset the timeout value to be 1 to
* trigger the timer as soon as possible.
*/
if (!wifi_tx_available(priv))
{
delay = 1;
goto exit;
}
dev->d_buf = priv->txbuf;
/* Update TCP timing states and poll the network for new XMIT data. */
devif_timer(&priv->dev, delay, wlan_txpoll);
dev->d_buf = NULL;
exit:
wd_start(&priv->txpoll, delay, wlan_poll_expiry, (wdparm_t)priv);
net_unlock();
}
/****************************************************************************
* Name: wlan_poll_expiry
*
* Description:
* Periodic timer handler. Called from the timer callback handler.
*
* Input Parameters:
* argc - The number of available arguments
* arg - The first argument
*
* Returned Value:
* None
*
****************************************************************************/
static void wlan_poll_expiry(wdparm_t arg)
{
FAR struct wlan_priv_s *priv = (FAR struct wlan_priv_s *)arg;
if (priv->ifup)
{
work_queue(WLAN_WORK, &priv->pollwork, wlan_poll_work, priv, 0);
}
}
/****************************************************************************
* Name: wlan_txavail_work
*
* Description:
* Perform an out-of-cycle poll on the worker thread.
*
* Input Parameters:
* arg - Reference to the NuttX driver state structure (cast to void*)
*