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nuttx/drivers/net/skeleton.c

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/****************************************************************************
* drivers/net/skeleton.c
*
* Copyright (C) 2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#if defined(CONFIG_NET) && defined(CONFIG_NET_skeleton)
#include <stdint.h>
#include <stdbool.h>
#include <time.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <debug.h>
#include <arpa/inet.h>
#include <nuttx/arch.h>
#include <nuttx/irq.h>
#include <nuttx/wdog.h>
#include <nuttx/net/arp.h>
#include <nuttx/net/netdev.h>
#ifdef CONFIG_NET_NOINTS
# include <nuttx/wqueue.h>
#endif
#ifdef CONFIG_NET_PKT
# include <nuttx/net/pkt.h>
#endif
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* If processing is not done at the interrupt level, then high priority
* work queue support is required.
*/
#if defined(CONFIG_NET_NOINTS) && !defined(CONFIG_SCHED_HPWORK)
# error High priority work queue support is required
#endif
/* CONFIG_skeleton_NINTERFACES determines the number of physical interfaces
* that will be supported.
*/
#ifndef CONFIG_skeleton_NINTERFACES
# define CONFIG_skeleton_NINTERFACES 1
#endif
/* TX poll delay = 1 seconds. CLK_TCK is the number of clock ticks per second */
#define skeleton_WDDELAY (1*CLK_TCK)
#define skeleton_POLLHSEC (1*2)
/* TX timeout = 1 minute */
#define skeleton_TXTIMEOUT (60*CLK_TCK)
/* This is a helper pointer for accessing the contents of the Ethernet header */
#define BUF ((struct eth_hdr_s *)priv->sk_dev.d_buf)
/****************************************************************************
* Private Types
****************************************************************************/
/* The skel_driver_s encapsulates all state information for a single hardware
* interface
*/
struct skel_driver_s
{
bool sk_bifup; /* true:ifup false:ifdown */
WDOG_ID sk_txpoll; /* TX poll timer */
WDOG_ID sk_txtimeout; /* TX timeout timer */
#ifdef CONFIG_NET_NOINTS
struct work_s sk_work; /* For deferring work to the work queue */
#endif
/* This holds the information visible to uIP/NuttX */
struct net_driver_s sk_dev; /* Interface understood by uIP */
};
/****************************************************************************
* Private Data
****************************************************************************/
static struct skel_driver_s g_skel[CONFIG_skeleton_NINTERFACES];
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Common TX logic */
static int skel_transmit(FAR struct skel_driver_s *priv);
static int skel_txpoll(struct net_driver_s *dev);
/* Interrupt handling */
static void skel_receive(FAR struct skel_driver_s *priv);
static void skel_txdone(FAR struct skel_driver_s *priv);
static inline void skel_interrupt_process(FAR struct skel_driver_s *priv);
#ifdef CONFIG_NET_NOINTS
static void skel_interrupt_work(FAR void *arg);
#endif
static int skel_interrupt(int irq, FAR void *context);
/* Watchdog timer expirations */
static inline void skel_txtimeout_process(FAR struct skel_driver_s *priv);
#ifdef CONFIG_NET_NOINTS
static void skel_txtimeout_work(FAR void *arg);
#endif
static void skel_txtimeout_expiry(int argc, uint32_t arg, ...);
static inline void skel_poll_process(FAR struct skel_driver_s *priv);
#ifdef CONFIG_NET_NOINTS
static void skel_poll_work(FAR void *arg);
#endif
static void skel_poll_expiry(int argc, uint32_t arg, ...);
/* NuttX callback functions */
static int skel_ifup(FAR struct net_driver_s *dev);
static int skel_ifdown(FAR struct net_driver_s *dev);
static inline void skel_txavail_process(FAR struct skel_driver_s *priv);
#ifdef CONFIG_NET_NOINTS
static void skel_txavail_work(FAR void *arg);
#endif
static int skel_txavail(FAR struct net_driver_s *dev);
#if defined(CONFIG_NET_IGMP) || defined(CONFIG_NET_ICMPv6)
static int skel_addmac(FAR struct net_driver_s *dev, FAR const uint8_t *mac);
#ifdef CONFIG_NET_IGMP
static int skel_rmmac(FAR struct net_driver_s *dev, FAR const uint8_t *mac);
#endif
#ifdef CONFIG_NET_ICMPv6
static void skel_ipv6multicast(FAR struct skel_driver_s *priv);
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Function: skel_transmit
*
* Description:
* Start hardware transmission. Called either from the txdone interrupt
* handling or from watchdog based polling.
*
* Parameters:
* priv - Reference to the driver state structure
*
* Returned Value:
* OK on success; a negated errno on failure
*
* Assumptions:
* May or may not be called from an interrupt handler. In either case,
* global interrupts are disabled, either explicitly or indirectly through
* interrupt handling logic.
*
****************************************************************************/
static int skel_transmit(FAR struct skel_driver_s *priv)
{
/* Verify that the hardware is ready to send another packet. If we get
* here, then we are committed to sending a packet; Higher level logic
* must have assured that there is no transmission in progress.
*/
/* Increment statistics */
/* Send the packet: address=priv->sk_dev.d_buf, length=priv->sk_dev.d_len */
/* Enable Tx interrupts */
/* Setup the TX timeout watchdog (perhaps restarting the timer) */
(void)wd_start(priv->sk_txtimeout, skeleton_TXTIMEOUT, skel_txtimeout_expiry, 1, (uint32_t)priv);
return OK;
}
/****************************************************************************
* Function: skel_txpoll
*
* Description:
* The transmitter is available, check if uIP 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 is complete,
* 2. When the preceding TX packet send timesout and the interface is reset
* 3. During normal TX polling
*
* Parameters:
* dev - Reference to the NuttX driver state structure
*
* Returned Value:
* OK on success; a negated errno on failure
*
* Assumptions:
* May or may not be called from an interrupt handler. In either case,
* global interrupts are disabled, either explicitly or indirectly through
* interrupt handling logic.
*
****************************************************************************/
static int skel_txpoll(struct net_driver_s *dev)
{
FAR struct skel_driver_s *priv = (FAR struct skel_driver_s *)dev->d_private;
/* 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 (priv->sk_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(priv->sk_dev.d_flags))
#endif
{
arp_out(&priv->sk_dev);
}
#endif /* CONFIG_NET_IPv4 */
#ifdef CONFIG_NET_IPv6
#ifdef CONFIG_NET_IPv4
else
#endif
{
neighbor_out(&priv->sk_dev);
}
#endif /* CONFIG_NET_IPv6 */
/* Send the packet */
skel_transmit(priv);
/* Check if there is room in the device to hold another packet. If not,
* return a non-zero value to terminate the poll.
*/
}
/* If zero is returned, the polling will continue until all connections have
* been examined.
*/
return 0;
}
/****************************************************************************
* Function: skel_receive
*
* Description:
* An interrupt was received indicating the availability of a new RX packet
*
* Parameters:
* priv - Reference to the driver state structure
*
* Returned Value:
* None
*
* Assumptions:
* Global interrupts are disabled by interrupt handling logic.
*
****************************************************************************/
static void skel_receive(FAR struct skel_driver_s *priv)
{
do
{
/* Check for errors and update statistics */
/* Check if the packet is a valid size for the uIP buffer configuration */
/* Copy the data data from the hardware to priv->sk_dev.d_buf. Set
* amount of data in priv->sk_dev.d_len
*/
#ifdef CONFIG_NET_PKT
/* When packet sockets are enabled, feed the frame into the packet tap */
pkt_input(&priv->sk_dev);
#endif
/* We only accept IP packets of the configured type and ARP packets */
#ifdef CONFIG_NET_IPv4
if (BUF->type == HTONS(ETHTYPE_IP))
{
nllvdbg("IPv4 frame\n");
/* Handle ARP on input then give the IPv4 packet to the network
* layer
*/
arp_ipin(&priv->sk_dev);
ipv4_input(&priv->sk_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->sk_dev.d_len > 0)
{
/* Update the Ethernet header with the correct MAC address */
#ifdef CONFIG_NET_IPv6
if (IFF_IS_IPv4(priv->sk_dev.d_flags))
#endif
{
arp_out(&priv->sk_dev);
}
#ifdef CONFIG_NET_IPv6
else
{
neighbor_out(&kel->sk_dev);
}
#endif
/* And send the packet */
skel_transmit(priv);
}
}
else
#endif
#ifdef CONFIG_NET_IPv6
if (BUF->type == HTONS(ETHTYPE_IP6))
{
nllvdbg("Iv6 frame\n");
/* Give the IPv6 packet to the network layer */
ipv6_input(&priv->sk_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->sk_dev.d_len > 0)
{
/* Update the Ethernet header with the correct MAC address */
#ifdef CONFIG_NET_IPv4
if (IFF_IS_IPv4(priv->sk_dev.d_flags))
{
arp_out(&priv->sk_dev);
}
else
#endif
#ifdef CONFIG_NET_IPv6
{
neighbor_out(&priv->sk_dev);
}
#endif
/* And send the packet */
skel_transmit(priv);
}
}
else
#endif
#ifdef CONFIG_NET_ARP
if (BUF->type == htons(ETHTYPE_ARP))
{
arp_arpin(&priv->sk_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->sk_dev.d_len > 0)
{
skel_transmit(priv);
}
}
#endif
}
while (); /* While there are more packets to be processed */
}
/****************************************************************************
* Function: skel_txdone
*
* Description:
* An interrupt was received indicating that the last TX packet(s) is done
*
* Parameters:
* priv - Reference to the driver state structure
*
* Returned Value:
* None
*
* Assumptions:
* Global interrupts are disabled by the watchdog logic.
*
****************************************************************************/
static void skel_txdone(FAR struct skel_driver_s *priv)
{
/* Check for errors and update statistics */
/* If no further xmits are pending, then cancel the TX timeout and
* disable further Tx interrupts.
*/
wd_cancel(priv->sk_txtimeout);
/* Then poll uIP for new XMIT data */
(void)devif_poll(&priv->sk_dev, skel_txpoll);
}
/****************************************************************************
* Function: skel_interrupt_process
*
* Description:
* Interrupt processing. This may be performed either within the interrupt
* handler or on the worker thread, depending upon the configuration
*
* Parameters:
* priv - Reference to the driver state structure
*
* Returned Value:
* None
*
* Assumptions:
* Ethernet interrupts are disabled
*
****************************************************************************/
static inline void skel_interrupt_process(FAR struct skel_driver_s *priv)
{
/* Get and clear interrupt status bits */
/* Handle interrupts according to status bit settings */
/* Check if we received an incoming packet, if so, call skel_receive() */
skel_receive(priv);
/* Check if a packet transmission just completed. If so, call skel_txdone.
* This may disable further Tx interrupts if there are no pending
* transmissions.
*/
skel_txdone(priv);
}
/****************************************************************************
* Function: skel_interrupt_work
*
* Description:
* Perform interrupt related work from the worker thread
*
* Parameters:
* arg - The argument passed when work_queue() was called.
*
* Returned Value:
* OK on success
*
* Assumptions:
* Ethernet interrupts are disabled
*
****************************************************************************/
#ifdef CONFIG_NET_NOINTS
static void skel_interrupt_work(FAR void *arg)
{
FAR struct skel_driver_s *priv = (FAR struct skel_driver_s *)arg;
net_lock_t state;
/* Process pending Ethernet interrupts */
state = net_lock();
skel_interrupt_process(priv);
net_unlock(state);
/* Re-enable Ethernet interrupts */
up_enable_irq(CONFIG_skeleton_IRQ);
}
#endif
/****************************************************************************
* Function: skel_interrupt
*
* Description:
* Hardware interrupt handler
*
* Parameters:
* irq - Number of the IRQ that generated the interrupt
* context - Interrupt register state save info (architecture-specific)
*
* Returned Value:
* OK on success
*
* Assumptions:
*
****************************************************************************/
static int skel_interrupt(int irq, FAR void *context)
{
FAR struct skel_driver_s *priv = &g_skel[0];
#ifdef CONFIG_NET_NOINTS
/* Disable further Ethernet interrupts. Because Ethernet interrupts are
* also disabled if the TX timeout event occurs, there can be no race
* condition here.
*/
up_disable_irq(CONFIG_skeleton_IRQ);
/* TODO: Determine if a TX transfer just completed */
{
/* If a TX transfer just completed, then cancel the TX timeout so
* there will be do race condition between any subsequent timeout
* expiration and the deferred interrupt processing.
*/
wd_cancel(priv->sk_txtimeout);
}
/* Cancel any pending poll work */
work_cancel(HPWORK, &priv->sk_work);
/* Schedule to perform the interrupt processing on the worker thread. */
work_queue(HPWORK, &priv->sk_work, skel_interrupt_work, priv, 0);
#else
/* Process the interrupt now */
skel_interrupt_process(priv);
#endif
return OK;
}
/****************************************************************************
* Function: skel_txtimeout_process
*
* Description:
* Process a TX timeout. Called from the either the watchdog timer
* expiration logic or from the worker thread, depending upon the
* configuration. The timeout means that the last TX never completed.
* Reset the hardware and start again.
*
* Parameters:
* priv - Reference to the driver state structure
*
* Returned Value:
* None
*
* Assumptions:
* Global interrupts are disabled by the watchdog logic.
*
****************************************************************************/
static inline void skel_txtimeout_process(FAR struct skel_driver_s *priv)
{
/* Increment statistics and dump debug info */
/* Then reset the hardware */
/* Then poll uIP for new XMIT data */
(void)devif_poll(&priv->sk_dev, skel_txpoll);
}
/****************************************************************************
* Function: skel_txtimeout_work
*
* Description:
* Perform TX timeout related work from the worker thread
*
* Parameters:
* arg - The argument passed when work_queue() as called.
*
* Returned Value:
* OK on success
*
* Assumptions:
* Ethernet interrupts are disabled
*
****************************************************************************/
#ifdef CONFIG_NET_NOINTS
static void skel_txtimeout_work(FAR void *arg)
{
FAR struct skel_driver_s *priv = (FAR struct skel_driver_s *)arg;
net_lock_t state;
/* Process pending Ethernet interrupts */
state = net_lock();
skel_txtimeout_process(priv);
net_unlock(state);
}
#endif
/****************************************************************************
* Function: skel_txtimeout_expiry
*
* Description:
* Our TX watchdog timed out. Called from the timer interrupt handler.
* The last TX never completed. Reset the hardware and start again.
*
* Parameters:
* argc - The number of available arguments
* arg - The first argument
*
* Returned Value:
* None
*
* Assumptions:
* Global interrupts are disabled by the watchdog logic.
*
****************************************************************************/
static void skel_txtimeout_expiry(int argc, uint32_t arg, ...)
{
FAR struct skel_driver_s *priv = (FAR struct skel_driver_s *)arg;
#ifdef CONFIG_NET_NOINTS
/* Disable further Ethernet interrupts. This will prevent some race
* conditions with interrupt work. There is still a potential race
* condition with interrupt work that is already queued and in progress.
*/
up_disable_irq(CONFIG_skeleton_IRQ);
/* Cancel any pending poll or interrupt work. This will have no effect
* on work that has already been started.
*/
work_cancel(HPWORK, &priv->sk_work);
/* Schedule to perform the TX timeout processing on the worker thread. */
work_queue(HPWORK, &priv->sk_work, skel_txtimeout_work, priv, 0);
#else
/* Process the timeout now */
skel_txtimeout_process(priv);
#endif
}
/****************************************************************************
* Function: skel_poll_process
*
* Description:
* Perform the periodic poll. This may be called either from watchdog
* timer logic or from the worker thread, depending upon the configuration.
*
* Parameters:
* priv - Reference to the driver state structure
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static inline void skel_poll_process(FAR struct skel_driver_s *priv)
{
/* 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 so, update TCP timing states and poll uIP for new XMIT data. Hmmm..
* might be bug here. Does this mean if there is a transmit in progress,
* we will missing TCP time state updates?
*/
(void)devif_timer(&priv->sk_dev, skel_txpoll, skeleton_POLLHSEC);
/* Setup the watchdog poll timer again */
(void)wd_start(priv->sk_txpoll, skeleton_WDDELAY, skel_poll_expiry, 1, priv);
}
/****************************************************************************
* Function: skel_poll_work
*
* Description:
* Perform periodic polling from the worker thread
*
* Parameters:
* arg - The argument passed when work_queue() as called.
*
* Returned Value:
* OK on success
*
* Assumptions:
* Ethernet interrupts are disabled
*
****************************************************************************/
#ifdef CONFIG_NET_NOINTS
static void skel_poll_work(FAR void *arg)
{
FAR struct skel_driver_s *priv = (FAR struct skel_driver_s *)arg;
net_lock_t state;
/* Perform the poll */
state = net_lock();
skel_poll_process(priv);
net_unlock(state);
}
#endif
/****************************************************************************
* Function: skel_poll_expiry
*
* Description:
* Periodic timer handler. Called from the timer interrupt handler.
*
* Parameters:
* argc - The number of available arguments
* arg - The first argument
*
* Returned Value:
* None
*
* Assumptions:
* Global interrupts are disabled by the watchdog logic.
*
****************************************************************************/
static void skel_poll_expiry(int argc, uint32_t arg, ...)
{
FAR struct skel_driver_s *priv = (FAR struct skel_driver_s *)arg;
#ifdef CONFIG_NET_NOINTS
/* Is our single work structure available? It may not be if there are
* pending interrupt actions.
*/
if (work_available(&priv->sk_work))
{
/* Schedule to perform the interrupt processing on the worker thread. */
work_queue(HPWORK, &priv->sk_work, skel_poll_work, priv, 0);
}
else
{
/* No.. Just re-start the watchdog poll timer, missing one polling
* cycle.
*/
(void)wd_start(priv->sk_txpoll, skeleton_WDDELAY, skel_poll_expiry, 1, arg);
}
#else
/* Process the interrupt now */
skel_poll_process(priv);
#endif
}
/****************************************************************************
* Function: skel_ifup
*
* Description:
* NuttX Callback: Bring up the Ethernet interface when an IP address is
* provided
*
* Parameters:
* dev - Reference to the NuttX driver state structure
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static int skel_ifup(struct net_driver_s *dev)
{
FAR struct skel_driver_s *priv = (FAR struct skel_driver_s *)dev->d_private;
ndbg("Bringing up: %d.%d.%d.%d\n",
dev->d_ipaddr & 0xff, (dev->d_ipaddr >> 8) & 0xff,
(dev->d_ipaddr >> 16) & 0xff, dev->d_ipaddr >> 24 );
/* Initialize PHYs, the Ethernet interface, and setup up Ethernet interrupts */
/* Instantiate the MAC address from priv->sk_dev.d_mac.ether_addr_octet */
#ifdef CONFIG_NET_ICMPv6
/* Set up IPv6 multicast address filtering */
skel_ipv6multicast(priv);
#endif
/* Set and activate a timer process */
(void)wd_start(priv->sk_txpoll, skeleton_WDDELAY, skel_poll_expiry, 1, (uint32_t)priv);
/* Enable the Ethernet interrupt */
priv->sk_bifup = true;
up_enable_irq(CONFIG_skeleton_IRQ);
return OK;
}
/****************************************************************************
* Function: skel_ifdown
*
* Description:
* NuttX Callback: Stop the interface.
*
* Parameters:
* dev - Reference to the NuttX driver state structure
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static int skel_ifdown(struct net_driver_s *dev)
{
FAR struct skel_driver_s *priv = (FAR struct skel_driver_s *)dev->d_private;
irqstate_t flags;
/* Disable the Ethernet interrupt */
flags = irqsave();
up_disable_irq(CONFIG_skeleton_IRQ);
/* Cancel the TX poll timer and TX timeout timers */
wd_cancel(priv->sk_txpoll);
wd_cancel(priv->sk_txtimeout);
/* Put the EMAC in its reset, non-operational state. This should be
* a known configuration that will guarantee the skel_ifup() always
* successfully brings the interface back up.
*/
/* Mark the device "down" */
priv->sk_bifup = false;
irqrestore(flags);
return OK;
}
/****************************************************************************
* Function: skel_txavail_process
*
* Description:
* Perform an out-of-cycle poll.
*
* Parameters:
* dev - Reference to the NuttX driver state structure
*
* Returned Value:
* None
*
* Assumptions:
* Called in normal user mode
*
****************************************************************************/
static inline void skel_txavail_process(FAR struct skel_driver_s *priv)
{
/* Ignore the notification if the interface is not yet up */
if (priv->sk_bifup)
{
/* Check if there is room in the hardware to hold another outgoing packet. */
/* If so, then poll uIP for new XMIT data */
(void)devif_poll(&priv->sk_dev, skel_txpoll);
}
}
/****************************************************************************
* Function: skel_txavail_work
*
* Description:
* Perform an out-of-cycle poll on the worker thread.
*
* Parameters:
* arg - Reference to the NuttX driver state structure (cast to void*)
*
* Returned Value:
* None
*
* Assumptions:
* Called on the higher priority worker thread.
*
****************************************************************************/
#ifdef CONFIG_NET_NOINTS
static void skel_txavail_work(FAR void *arg)
{
FAR struct skel_driver_s *priv = (FAR struct skel_driver_s *)arg;
net_lock_t state;
/* Perform the poll */
state = net_lock();
skel_txavail_process(priv);
net_unlock(state);
}
#endif
/****************************************************************************
* Function: skel_txavail
*
* Description:
* Driver callback invoked when new TX data is available. This is a
* stimulus perform an out-of-cycle poll and, thereby, reduce the TX
* latency.
*
* Parameters:
* dev - Reference to the NuttX driver state structure
*
* Returned Value:
* None
*
* Assumptions:
* Called in normal user mode
*
****************************************************************************/
static int skel_txavail(struct net_driver_s *dev)
{
FAR struct skel_driver_s *priv = (FAR struct skel_driver_s *)dev->d_private;
#ifdef CONFIG_NET_NOINTS
/* Is our single work structure available? It may not be if there are
* pending interrupt actions and we will have to ignore the Tx
* availability action.
*/
if (work_available(&priv->sk_work))
{
/* Schedule to serialize the poll on the worker thread. */
work_queue(HPWORK, &priv->sk_work, skel_txavail_work, priv, 0);
}
#else
irqstate_t flags;
/* Disable interrupts because this function may be called from interrupt
* level processing.
*/
flags = irqsave();
/* Perform the out-of-cycle poll now */
skel_txavail_process(priv);
irqrestore(flags);
#endif
return OK;
}
/****************************************************************************
* Function: skel_addmac
*
* Description:
* NuttX Callback: Add the specified MAC address to the hardware multicast
* address filtering
*
* Parameters:
* dev - Reference to the NuttX driver state structure
* mac - The MAC address to be added
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
#if defined(CONFIG_NET_IGMP) || defined(CONFIG_NET_ICMPv6)
static int skel_addmac(struct net_driver_s *dev, FAR const uint8_t *mac)
{
FAR struct skel_driver_s *priv = (FAR struct skel_driver_s *)dev->d_private;
/* Add the MAC address to the hardware multicast routing table */
return OK;
}
#endif
/****************************************************************************
* Function: skel_rmmac
*
* Description:
* NuttX Callback: Remove the specified MAC address from the hardware multicast
* address filtering
*
* Parameters:
* dev - Reference to the NuttX driver state structure
* mac - The MAC address to be removed
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
#ifdef CONFIG_NET_IGMP
static int skel_rmmac(struct net_driver_s *dev, FAR const uint8_t *mac)
{
FAR struct skel_driver_s *priv = (FAR struct skel_driver_s *)dev->d_private;
/* Add the MAC address to the hardware multicast routing table */
return OK;
}
#endif
/****************************************************************************
* Function: skel_ipv6multicast
*
* Description:
* Configure the IPv6 multicast MAC address.
*
* Parameters:
* priv - A reference to the private driver state structure
*
* Returned Value:
* OK on success; Negated errno on failure.
*
* Assumptions:
*
****************************************************************************/
#ifdef CONFIG_NET_ICMPv6
static void skel_ipv6multicast(FAR struct skel_driver_s *priv)
{
FAR struct net_driver_s *dev;
uint16_t tmp16;
uint8_t mac[6];
/* For ICMPv6, we need to add the IPv6 multicast address
*
* For IPv6 multicast addresses, the Ethernet MAC is derived by
* the four low-order octets OR'ed with the MAC 33:33:00:00:00:00,
* so for example the IPv6 address FF02:DEAD:BEEF::1:3 would map
* to the Ethernet MAC address 33:33:00:01:00:03.
*
* NOTES: This appears correct for the ICMPv6 Router Solicitation
* Message, but the ICMPv6 Neighbor Solicitation message seems to
* use 33:33:ff:01:00:03.
*/
mac[0] = 0x33;
mac[1] = 0x33;
dev = &priv->dev;
tmp16 = dev->d_ipv6addr[6];
mac[2] = 0xff;
mac[3] = tmp16 >> 8;
tmp16 = dev->d_ipv6addr[7];
mac[4] = tmp16 & 0xff;
mac[5] = tmp16 >> 8;
nvdbg("IPv6 Multicast: %02x:%02x:%02x:%02x:%02x:%02x\n",
mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
(void)skel_addmac(dev, mac);
#ifdef CONFIG_NET_ICMPv6_AUTOCONF
/* Add the IPv6 all link-local nodes Ethernet address. This is the
* address that we expect to receive ICMPv6 Router Advertisement
* packets.
*/
(void)skel_addmac(dev, g_ipv6_ethallnodes.ether_addr_octet);
#endif /* CONFIG_NET_ICMPv6_AUTOCONF */
#ifdef CONFIG_NET_ICMPv6_ROUTER
/* Add the IPv6 all link-local routers Ethernet address. This is the
* address that we expect to receive ICMPv6 Router Solicitation
* packets.
*/
(void)skel_addmac(dev, g_ipv6_ethallrouters.ether_addr_octet);
#endif /* CONFIG_NET_ICMPv6_ROUTER */
}
#endif /* CONFIG_NET_ICMPv6 */
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: skel_initialize
*
* Description:
* Initialize the Ethernet controller and driver
*
* Parameters:
* intf - In the case where there are multiple EMACs, this value
* identifies which EMAC is to be initialized.
*
* Returned Value:
* OK on success; Negated errno on failure.
*
* Assumptions:
*
****************************************************************************/
int skel_initialize(int intf)
{
struct skel_driver_s *priv;
/* Get the interface structure associated with this interface number. */
DEBUGASSERT(inf < CONFIG_skeleton_NINTERFACES);
priv = &g_skel[intf];
/* Check if a Ethernet chip is recognized at its I/O base */
/* Attach the IRQ to the driver */
if (irq_attach(CONFIG_skeleton_IRQ, skel_interrupt))
{
/* We could not attach the ISR to the interrupt */
return -EAGAIN;
}
/* Initialize the driver structure */
memset(priv, 0, sizeof(struct skel_driver_s));
priv->sk_dev.d_ifup = skel_ifup; /* I/F up (new IP address) callback */
priv->sk_dev.d_ifdown = skel_ifdown; /* I/F down callback */
priv->sk_dev.d_txavail = skel_txavail; /* New TX data callback */
#ifdef CONFIG_NET_IGMP
priv->sk_dev.d_addmac = skel_addmac; /* Add multicast MAC address */
priv->sk_dev.d_rmmac = skel_rmmac; /* Remove multicast MAC address */
#endif
priv->sk_dev.d_private = (void*)g_skel; /* Used to recover private state from dev */
/* Create a watchdog for timing polling for and timing of transmisstions */
priv->sk_txpoll = wd_create(); /* Create periodic poll timer */
priv->sk_txtimeout = wd_create(); /* Create TX timeout timer */
/* Put the interface in the down state. This usually amounts to resetting
* the device and/or calling skel_ifdown().
*/
/* Read the MAC address from the hardware into priv->sk_dev.d_mac.ether_addr_octet */
/* Register the device with the OS so that socket IOCTLs can be performed */
(void)netdev_register(&priv->sk_dev, NET_LL_ETHERNET);
return OK;
}
#endif /* CONFIG_NET && CONFIG_NET_skeleton */
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