Google Git
Sign in
apache / nuttx / aa8fb9ae2e9d22ae71976db5e3d82b55a25b8c1b / . / net / devif / devif_poll.c
blob: 8b762bfacce400c3189796b284f3b8775375b444 [file] [log] [blame]
/****************************************************************************
* net/devif/devif_poll.c
*
* SPDX-License-Identifier: Apache-2.0
*
* 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_NET
#include <debug.h>
#include <nuttx/clock.h>
#include <nuttx/net/netconfig.h>
#include <nuttx/net/netdev.h>
#include <nuttx/net/net.h>
#include "devif/devif.h"
#include "netdev/netdev.h"
#include "arp/arp.h"
#include "can/can.h"
#include "tcp/tcp.h"
#include "udp/udp.h"
#include "pkt/pkt.h"
#include "bluetooth/bluetooth.h"
#include "ieee802154/ieee802154.h"
#include "icmp/icmp.h"
#include "igmp/igmp.h"
#include "icmpv6/icmpv6.h"
#include "mld/mld.h"
#include "ipforward/ipforward.h"
#include "sixlowpan/sixlowpan.h"
#include "ipfilter/ipfilter.h"
#include "ipfrag/ipfrag.h"
#include "inet/inet.h"
/****************************************************************************
* Private Types
****************************************************************************/
enum devif_packet_type
{
DEVIF_PKT = 0,
DEVIF_ICMP,
DEVIF_IGMP,
DEVIF_TCP,
DEVIF_UDP,
DEVIF_ICMP6
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: devif_packet_conversion
*
* Description:
* Generic output conversion hook. Only needed for IEEE802.15.4 (and
* other non-standard packet radios) for now but this is a point where
* support for other conversions may be provided.
*
* TCP output comes through three different mechanisms. Either from:
*
* 1. TCP socket output. For the case of TCP output to a radio,
* the TCP output is caught in the socket send()/sendto() logic and
* redirected to 6LoWPAN logic.
* 2. TCP output from the TCP state machine. That will occur
* during TCP packet processing by the TCP state meachine.
* 3. TCP output resulting from TX or timer polling
*
* Cases 2 is handled here. Logic here detected if (1) an attempt
* to return with d_len > 0 and (2) that the device is a radio
* network driver. Under those conditions, 6LoWPAN logic will be called
* to create the radio frames.
*
* All outgoing ICMPv6 messages come through one of two mechanisms:
*
* 1. The output from internal ICMPv6 message passing. These outgoing
* messages will use device polling and will be handled here.
* 2. ICMPv6 output resulting from TX or timer polling.
*
* Assumptions:
* The network is locked.
*
****************************************************************************/
#ifdef CONFIG_NET_6LOWPAN
static void devif_packet_conversion(FAR struct net_driver_s *dev,
enum devif_packet_type pkttype)
{
if (dev->d_len > 0)
{
/* Check if this is a device served by 6LoWPAN */
if (dev->d_lltype == NET_LL_IEEE802154 ||
dev->d_lltype == NET_LL_PKTRADIO)
{
FAR struct ipv6_hdr_s *ipv6 = (FAR struct ipv6_hdr_s *)dev->d_buf;
#ifdef CONFIG_NET_IPv4
if ((ipv6->vtc & IP_VERSION_MASK) != IPv6_VERSION)
{
nerr("ERROR: IPv6 version error: %02x... Packet dropped\n",
ipv6->vtc);
}
else
#endif
#ifdef CONFIG_NET_TCP
if (pkttype == DEVIF_TCP)
{
/* This packet came from a response to TCP polling and is
* directed to an radio driver using 6LoWPAN. Verify that the
* outgoing packet is IPv6 with TCP protocol.
*/
if (ipv6->proto == IP_PROTO_TCP)
{
/* Let 6LoWPAN convert IPv6 TCP output into radio frames. */
sixlowpan_tcp_send(dev, dev, ipv6);
}
else
{
nerr("ERROR: TCP protocol error: %u... Packet dropped\n",
ipv6->proto);
}
}
else
#endif
#ifdef CONFIG_NET_ICMPv6
if (pkttype == DEVIF_ICMP6)
{
/* This packet came from a response to ICMPv6 polling and is
* directed to a radio using 6LoWPAN. Verify that the outgoing
* packet is IPv6 with TCP protocol.
*/
if (ipv6->proto == IP_PROTO_ICMP6)
{
/* Let 6LoWPAN convert IPv6 ICMPv6 output into radio
* frames.
*/
sixlowpan_icmpv6_send(dev, dev, ipv6);
}
else
{
nerr("ERROR: ICMPv6 protocol error: %u..."
" Packet dropped\n",
ipv6->proto);
}
}
else
#endif
{
nerr("ERROR: Unhandled packet dropped."
" pkttype=%u protocol=%u\n",
pkttype, ipv6->proto);
}
UNUSED(ipv6);
dev->d_len = 0;
}
}
}
#else
# define devif_packet_conversion(dev,pkttype)
#endif /* CONFIG_NET_6LOWPAN */
/****************************************************************************
* Name: devif_poll_local_out
*
* Description:
* Generic callback before device output to build L2 headers before sending
* with packet filter for TCP/UDP/ICMP(v6).
*
* Assumptions:
* This function is called from the MAC device driver with the network
* locked.
*
****************************************************************************/
#ifdef CONFIG_NET_IPFILTER
static int devif_poll_local_out(FAR struct net_driver_s *dev,
devif_poll_callback_t callback)
{
/* Maybe we need to reply REJECT to ourself, so filter before loopback. */
ipfilter_out(dev);
return devif_poll_out(dev, callback);
}
#else
# define devif_poll_local_out(dev, callback) devif_poll_out(dev, callback)
#endif /* CONFIG_NET_IPFILTER */
/****************************************************************************
* Name: devif_poll_pkt_connections
*
* Description:
* Poll all packet connections for available packets to send.
*
* Assumptions:
* This function is called from the MAC device driver with the network
* locked.
*
****************************************************************************/
#ifdef CONFIG_NET_PKT
static int devif_poll_pkt_connections(FAR struct net_driver_s *dev,
devif_poll_callback_t callback)
{
FAR struct pkt_conn_s *pkt_conn = NULL;
int bstop = 0;
/* Traverse all of the allocated packet connections and perform the poll
* action.
*/
while (!bstop && (pkt_conn = pkt_nextconn(pkt_conn)))
{
/* Skip packet connections that are bound to other polling devices */
if (dev->d_ifindex == pkt_conn->ifindex)
{
/* Perform the packet TX poll */
pkt_poll(dev, pkt_conn);
/* Perform any necessary conversions on outgoing packets */
devif_packet_conversion(dev, DEVIF_PKT);
/* Call back into the driver */
if (dev->d_len > 0)
{
bstop = callback(dev);
}
}
}
return bstop;
}
#endif /* CONFIG_NET_PKT */
/****************************************************************************
* Name: devif_poll_can_connections
*
* Description:
* Poll all packet connections for available packets to send.
*
* Assumptions:
* This function is called from the MAC device driver with the network
* locked.
*
****************************************************************************/
#ifdef CONFIG_NET_CAN
static int devif_poll_can_connections(FAR struct net_driver_s *dev,
devif_poll_callback_t callback)
{
FAR struct can_conn_s *can_conn = NULL;
int bstop = 0;
/* Traverse all of the allocated packet connections and
* perform the poll action
*/
while (!bstop && (can_conn = can_nextconn(can_conn)))
{
/* Skip connections that are bound to other polling devices */
if (dev == can_conn->dev)
{
/* Perform the packet TX poll */
can_poll(dev, can_conn);
/* Call back into the driver */
if (dev->d_len > 0)
{
bstop = callback(dev);
}
}
}
return bstop;
}
#endif /* CONFIG_NET_PKT */
/****************************************************************************
* Name: devif_poll_bluetooth_connections
*
* Description:
* Poll all packet connections for available packets to send.
*
* Assumptions:
* This function is called from the MAC device driver with the network
* locked.
*
****************************************************************************/
#ifdef CONFIG_NET_BLUETOOTH
static int devif_poll_bluetooth_connections(FAR struct net_driver_s *dev,
devif_poll_callback_t callback)
{
FAR struct bluetooth_conn_s *bluetooth_conn = NULL;
int bstop = 0;
/* Traverse all of the allocated packet connections and perform the poll
* action.
*/
while (!bstop && (bluetooth_conn = bluetooth_conn_next(bluetooth_conn)))
{
/* Perform the packet TX poll */
bluetooth_poll(dev, bluetooth_conn);
/* Call back into the driver */
if (dev->d_len > 0)
{
bstop = callback(dev);
}
}
return bstop;
}
#endif /* CONFIG_NET_BLUETOOTH */
/****************************************************************************
* Name: devif_poll_ieee802154_connections
*
* Description:
* Poll all packet connections for available packets to send.
*
* Assumptions:
* This function is called from the MAC device driver with the network
* locked.
*
****************************************************************************/
#ifdef CONFIG_NET_IEEE802154
static int devif_poll_ieee802154_connections(FAR struct net_driver_s *dev,
devif_poll_callback_t callback)
{
FAR struct ieee802154_conn_s *ieee802154_conn = NULL;
int bstop = 0;
/* Traverse all of the allocated packet connections and perform the poll
* action.
*/
while (!bstop && (ieee802154_conn = ieee802154_conn_next(ieee802154_conn)))
{
/* Perform the packet TX poll */
ieee802154_poll(dev, ieee802154_conn);
/* Call back into the driver */
if (dev->d_len > 0)
{
bstop = callback(dev);
}
}
return bstop;
}
#endif /* CONFIG_NET_IEEE802154 */
/****************************************************************************
* Name: devif_poll_icmp
*
* Description:
* Poll all of the connections waiting to send an ICMP ECHO request
*
****************************************************************************/
#if defined(CONFIG_NET_ICMP) && defined(CONFIG_NET_ICMP_SOCKET)
static inline int devif_poll_icmp(FAR struct net_driver_s *dev,
devif_poll_callback_t callback)
{
FAR struct icmp_conn_s *conn = NULL;
int bstop = 0;
/* Traverse all of the allocated ICMP connections and perform the poll
* action.
*/
while (!bstop && (conn = icmp_nextconn(conn)) != NULL)
{
/* Skip ICMP connections that are bound to other polling devices */
if (dev == conn->dev)
{
/* Perform the ICMP poll */
icmp_poll(dev, conn);
/* Perform any necessary conversions on outgoing packets */
devif_packet_conversion(dev, DEVIF_ICMP);
/* Call back into the driver */
bstop = devif_poll_local_out(dev, callback);
}
}
return bstop;
}
#endif /* CONFIG_NET_ICMP && CONFIG_NET_ICMP_SOCKET */
/****************************************************************************
* Name: devif_poll_icmpv6
*
* Description:
* Poll all of the connections waiting to send an ICMPv6 ECHO request
*
****************************************************************************/
#if defined(CONFIG_NET_ICMPv6_SOCKET) || defined(CONFIG_NET_ICMPv6_NEIGHBOR)
static inline int devif_poll_icmpv6(FAR struct net_driver_s *dev,
devif_poll_callback_t callback)
{
FAR struct icmpv6_conn_s *conn = NULL;
int bstop = 0;
/* Traverse all of the allocated ICMPv6 connections and perform the poll
* action.
*/
do
{
/* Skip ICMPv6 connections that are bound to other polling devices */
if (conn == NULL || dev == conn->dev)
{
/* Perform the ICMPV6 poll
* Note: conn equal NULL in the first iteration means poll dev's
* callback list since icmpv6_autoconfig and icmpv6_neighbor still
* append it's callback into this list.
*/
icmpv6_poll(dev, conn);
/* Perform any necessary conversions on outgoing packets */
devif_packet_conversion(dev, DEVIF_ICMP6);
/* Call back into the driver */
bstop = devif_poll_local_out(dev, callback);
}
}
while (!bstop && (conn = icmpv6_nextconn(conn)) != NULL);
return bstop;
}
#endif /* CONFIG_NET_ICMPv6_SOCKET || CONFIG_NET_ICMPv6_NEIGHBOR*/
/****************************************************************************
* Name: devif_poll_forward
*
* Description:
* Poll the device event to see if any task is waiting to forward a packet.
*
****************************************************************************/
#ifdef CONFIG_NET_IPFORWARD
static inline int devif_poll_forward(FAR struct net_driver_s *dev,
devif_poll_callback_t callback)
{
/* Perform the forwarding poll */
ipfwd_poll(dev);
/* NOTE: that 6LoWPAN packet conversions are handled differently for
* forwarded packets. That is because we don't know what the packet
* type is at this point; not within peeking into the device's d_buf.
*/
/* Call back into the driver */
return devif_poll_out(dev, callback);
}
#endif /* CONFIG_NET_ICMPv6_SOCKET || CONFIG_NET_ICMPv6_NEIGHBOR*/
/****************************************************************************
* Name: devif_poll_igmp
*
* Description:
* Poll all IGMP connections for available packets to send.
*
* Assumptions:
* This function is called from the MAC device driver with the network
* locked.
*
****************************************************************************/
#ifdef CONFIG_NET_IGMP
static inline int devif_poll_igmp(FAR struct net_driver_s *dev,
devif_poll_callback_t callback)
{
/* Perform the IGMP TX poll */
igmp_poll(dev);
/* Perform any necessary conversions on outgoing packets */
devif_packet_conversion(dev, DEVIF_IGMP);
/* Call back into the driver */
return devif_poll_out(dev, callback);
}
#endif /* CONFIG_NET_IGMP */
/****************************************************************************
* Name: devif_poll_mld
*
* Description:
* Poll all MLD connections for available packets to send.
*
* Assumptions:
* This function is called from the MAC device driver with the network
* locked.
*
****************************************************************************/
#ifdef CONFIG_NET_MLD
static inline int devif_poll_mld(FAR struct net_driver_s *dev,
devif_poll_callback_t callback)
{
/* Perform the MLD TX poll */
mld_poll(dev);
/* Perform any necessary conversions on outgoing ICMPv6 packets */
devif_packet_conversion(dev, DEVIF_ICMP6);
/* Call back into the driver */
return devif_poll_out(dev, callback);
}
#endif /* CONFIG_NET_MLD */
/****************************************************************************
* Name: devif_poll_udp_connections
*
* Description:
* Poll all UDP connections for available packets to send.
*
* Assumptions:
* This function is called from the MAC device driver with the network
* locked.
*
****************************************************************************/
#ifdef NET_UDP_HAVE_STACK
static int devif_poll_udp_connections(FAR struct net_driver_s *dev,
devif_poll_callback_t callback)
{
FAR struct udp_conn_s *conn = NULL;
int bstop = 0;
/* Traverse all of the allocated UDP connections and perform the poll
* action.
*/
while (!bstop && (conn = udp_nextconn(conn)))
{
#ifdef CONFIG_NET_UDP_WRITE_BUFFERS
/* Skip UDP connections that are bound to other polling devices */
if (dev == conn->dev)
#endif
{
/* Perform the UDP TX poll */
udp_poll(dev, conn);
/* Perform any necessary conversions on outgoing packets */
devif_packet_conversion(dev, DEVIF_UDP);
/* Call back into the driver */
bstop = devif_poll_local_out(dev, callback);
}
}
return bstop;
}
#endif /* NET_UDP_HAVE_STACK */
/****************************************************************************
* Name: devif_poll_tcp_connections
*
* Description:
* Poll all TCP connections for available packets to send.
*
* Assumptions:
* This function is called from the MAC device driver with the network
* locked.
*
****************************************************************************/
#ifdef NET_TCP_HAVE_STACK
static inline int devif_poll_tcp_connections(FAR struct net_driver_s *dev,
devif_poll_callback_t callback)
{
FAR struct tcp_conn_s *conn = NULL;
int bstop = 0;
/* Traverse all of the active TCP connections and perform the poll action */
while (!bstop && (conn = tcp_nextconn(conn)))
{
/* Skip TCP connections that are bound to other polling devices */
if (dev == conn->dev)
{
/* Perform the TCP TX poll */
tcp_poll(dev, conn);
/* Perform any necessary conversions on outgoing packets */
devif_packet_conversion(dev, DEVIF_TCP);
/* Call back into the driver */
bstop = devif_poll_local_out(dev, callback);
}
}
return bstop;
}
#else
# define devif_poll_tcp_connections(dev, callback) (0)
#endif
/****************************************************************************
* Name: devif_poll_ipfrag
*
* Description:
* Poll all ip fragments for available packets to send.
*
* Input Parameters:
* dev - NIC Device instance.
* callback - the actual sending API provided by each NIC driver.
*
* Returned Value:
* Zero indicated the polling will continue, else stop the polling.
*
* Assumptions:
* This function is called from the MAC device driver with the network
* locked.
*
****************************************************************************/
#ifdef CONFIG_NET_IPFRAG
static int devif_poll_ipfrag(FAR struct net_driver_s *dev,
devif_poll_callback_t callback)
{
FAR struct iob_s *frag;
bool reused = false;
int bstop = false;
while (!bstop)
{
/* Dequeue outgoing fragment from dev->d_fragout */
frag = iob_remove_queue(&dev->d_fragout);
if (frag == NULL)
{
break;
}
/* Frag buffer could be reused for other protocols */
reused = true;
/* Replace original iob */
netdev_iob_replace(dev, frag);
/* build L2 headers */
devif_out(dev);
/* Call back into the driver */
if (dev->d_len > 0)
{
bstop = callback(dev);
}
}
/* Notify the device driver that ip fragments is available. */
if (iob_peek_queue(&dev->d_fragout) != NULL)
{
netdev_txnotify_dev(dev);
}
/* Reuse iob buffer */
if (!bstop && reused)
{
iob_update_pktlen(dev->d_iob, 0, false);
netdev_iob_prepare(dev, true, 0);
}
return bstop;
}
#endif
/****************************************************************************
* Name: devif_poll_connections
*
* Description:
* This function will traverse each active network connection structure and
* will perform network polling operations. devif_poll() may be called
* asynchronously with the network driver can accept another outgoing
* packet.
*
* This function will call the provided callback function for every active
* connection. Polling will continue until all connections have been polled
* or until the user-supplied function returns a non-zero value (which it
* should do only if it cannot accept further write data).
*
* When the callback function is called, there may be an outbound packet
* waiting for service in the device packet buffer, and if so the d_len
* field is set to a value larger than zero. The device driver should then
* send out the packet.
*
* Assumptions:
* This function is called from the MAC device driver with the network
* locked.
*
****************************************************************************/
static int devif_poll_connections(FAR struct net_driver_s *dev,
devif_poll_callback_t callback)
{
int bstop = false;
/* Reset device buffer length */
dev->d_len = 0;
/* Traverse all of the active packet connections and perform the poll
* action.
*/
#ifdef CONFIG_NET_IPFRAG
/* Traverse all of ip fragments for available packets to transfer */
bstop = devif_poll_ipfrag(dev, callback);
if (!bstop)
#endif
#ifdef CONFIG_NET_ARP_SEND
{
/* Check for pending ARP requests */
bstop = arp_poll(dev, callback);
}
if (!bstop)
#endif
#ifdef CONFIG_NET_PKT
{
/* Check for pending packet socket transfer */
bstop = devif_poll_pkt_connections(dev, callback);
}
if (!bstop)
#endif
#ifdef CONFIG_NET_CAN
{
/* Check for pending CAN socket transfer */
bstop = devif_poll_can_connections(dev, callback);
}
if (!bstop)
#endif
#ifdef CONFIG_NET_BLUETOOTH
{
/* Check for pending PF_BLUETOOTH socket transfer */
bstop = devif_poll_bluetooth_connections(dev, callback);
}
if (!bstop)
#endif
#ifdef CONFIG_NET_IEEE802154
{
/* Check for pending PF_IEEE802154 socket transfer */
bstop = devif_poll_ieee802154_connections(dev, callback);
}
if (!bstop)
#endif
#ifdef CONFIG_NET_IGMP
{
/* Check for pending IGMP messages */
bstop = devif_poll_igmp(dev, callback);
}
if (!bstop)
#endif
#ifdef CONFIG_NET_MLD
{
/* Check for pending MLD messages */
bstop = devif_poll_mld(dev, callback);
}
if (!bstop)
#endif
#ifdef NET_TCP_HAVE_STACK
{
/* Traverse all of the active TCP connections and perform the poll
* action.
*/
bstop = devif_poll_tcp_connections(dev, callback);
}
if (!bstop)
#endif
#ifdef NET_UDP_HAVE_STACK
{
/* Traverse all of the allocated UDP connections and perform
* the poll action
*/
bstop = devif_poll_udp_connections(dev, callback);
}
if (!bstop)
#endif
#if defined(CONFIG_NET_ICMP) && defined(CONFIG_NET_ICMP_SOCKET)
{
/* Traverse all of the tasks waiting to send an ICMP ECHO request. */
bstop = devif_poll_icmp(dev, callback);
}
if (!bstop)
#endif
#if defined(CONFIG_NET_ICMPv6_SOCKET) || defined(CONFIG_NET_ICMPv6_NEIGHBOR)
{
/* Traverse all of the tasks waiting to send an ICMPv6 ECHO request. */
bstop = devif_poll_icmpv6(dev, callback);
}
if (!bstop)
#endif
#ifdef CONFIG_NET_IPFORWARD
{
/* Traverse all of the tasks waiting to forward a packet to this
* device.
*/
bstop = devif_poll_forward(dev, callback);
}
if (!bstop)
#endif
{
/* Nothing more to do */
}
return bstop;
}
/****************************************************************************
* Name: devif_iob_poll
*
* Description:
* This function will traverse each active network connection structure and
* will perform network polling operations. devif_poll() may be called
* asynchronously with the network driver can accept another outgoing
* packet.
*
* This function will call the provided callback function for every active
* connection. Polling will continue until all connections have been polled
* or until the user-supplied function returns a non-zero value (which it
* should do only if it cannot accept further write data).
*
* When the callback function is called, there may be an outbound packet
* waiting for service in the device packet buffer, and if so the d_len
* field is set to a value larger than zero. The device driver should then
* send out the packet.
*
* This is the iob buffer version of devif_input(),
* this function will support send/receive iob vectors directly between
* the driver and l3/l4 stack to avoid unnecessary memory copies,
* especially on hardware that supports Scatter/gather, which can
* greatly improve performance
* this function will uses d_iob as packets input which used by some
* NICs such as celluler net driver.
*
* If NIC hardware support Scatter/gather transfer
*
* tcp_poll()/udp_poll()/pkt_poll()/...(l3/l4)
* / \
* / \
* devif_poll_[l3|l4]_connections() devif_iob_send() (nocopy:udp/icmp/...)
* / \ (copy:tcp)
* / \
* devif_iob_poll("NIC"_txpoll) callback() // "NIC"_txpoll
*
*
* Assumptions:
* This function is called from the MAC device driver with the network
* locked.
*
****************************************************************************/
static int devif_iob_poll(FAR struct net_driver_s *dev,
devif_poll_callback_t callback)
{
int bstop;
/* Perform all connections poll */
bstop = devif_poll_connections(dev, callback);
/* Device polling completed, release iob */
netdev_iob_release(dev);
return bstop;
}
/****************************************************************************
* Name: devif_poll_callback
*
* Description:
* This function will help us to gather multiple iob memory slices into a
* linear device buffer. if devices with small memory, this function will
* trigger a memory copy if net device start transmit the iob slices to
* flat buffer
*
****************************************************************************/
static int devif_poll_callback(FAR struct net_driver_s *dev)
{
if (dev->d_len > 0)
{
return true;
}
return false;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: devif_poll
*
* Description:
* This function will traverse each active network connection structure and
* will perform network polling operations. devif_poll() may be called
* asynchronously with the network driver can accept another outgoing
* packet.
*
* This function will call the provided callback function for every active
* connection. Polling will continue until all connections have been polled
* or until the user-supplied function returns a non-zero value (which it
* should do only if it cannot accept further write data).
*
* When the callback function is called, there may be an outbound packet
* waiting for service in the device packet buffer, and if so the d_len
* field is set to a value larger than zero. The device driver should then
* send out the packet.
*
* Compatible with all old flat buffer NICs
*
* tcp_poll()/udp_poll()/pkt_poll()/...(l3|l4)
* / \
* / \
* devif_poll_[l3|l4]_connections() devif_iob_send() (nocopy:udp/icmp/..)
* / \ (copy:tcp)
* / \
* devif_iob_poll(devif_poll_callback()) devif_poll_callback()
* / \
* / \
* devif_poll("NIC"_txpoll) "NIC"_send()(dev->d_buf)
*
*
* Assumptions:
* This function is called from the MAC device driver with the network
* locked.
*
****************************************************************************/
int devif_poll(FAR struct net_driver_s *dev, devif_poll_callback_t callback)
{
unsigned len;
uint16_t llhdrlen;
FAR uint8_t *buf;
int bstop;
if (dev->d_buf == NULL)
{
return devif_iob_poll(dev, callback);
}
buf = dev->d_buf;
llhdrlen = NET_LL_HDRLEN(dev);
do
{
/* Perform all connections poll */
bstop = devif_poll_connections(dev, devif_poll_callback);
if (dev->d_len > 0)
{
/* Copy iob to flat buffer */
len = MAX(dev->d_len, dev->d_sndlen);
iob_copyout(buf, dev->d_iob, len, -llhdrlen);
/* Restore flat buffer pointer */
dev->d_buf = buf;
/* Call the real device callback */
bstop = callback(dev);
/* Flat buffer changed by NIC ? */
if (dev->d_buf != buf)
{
buf = dev->d_buf;
if (buf == NULL)
{
break;
}
}
}
else
{
/* Not stopped by devif_poll_callback, just stop and return bstop */
break;
}
}
while (!bstop);
/* Device polling completed, release iob */
netdev_iob_release(dev);
/* Restore the flat buffer */
dev->d_buf = buf;
return bstop;
}
/****************************************************************************
* Name: devif_out
*
* Description:
* Generic interface to build L2 headers
*
* Assumptions:
* This function is called from the MAC device driver with the network
* locked.
*
****************************************************************************/
void devif_out(FAR struct net_driver_s *dev)
{
if (dev->d_len == 0)
{
return;
}
switch (dev->d_lltype)
{
#ifdef CONFIG_NET_ETHERNET
case NET_LL_ETHERNET:
case NET_LL_IEEE80211:
# ifdef CONFIG_NET_IPv4
# ifdef CONFIG_NET_IPv6
if (IFF_IS_IPv4(dev->d_flags))
# endif /* CONFIG_NET_IPv6 */
{
arp_out(dev);
}
# endif /* CONFIG_NET_IPv4 */
# ifdef CONFIG_NET_IPv6
# ifdef CONFIG_NET_IPv4
else
# endif /* CONFIG_NET_IPv4 */
{
neighbor_out(dev);
}
# endif /* CONFIG_NET_IPv6 */
break;
#endif /* CONFIG_NET_ETHERNET */
default:
break;
}
}
/****************************************************************************
* Name: devif_poll_out
*
* Description:
* Generic callback before device output to build L2 headers before sending
*
* Assumptions:
* This function is called from the MAC device driver with the network
* locked.
*
****************************************************************************/
int devif_poll_out(FAR struct net_driver_s *dev,
devif_poll_callback_t callback)
{
int bstop;
if (dev->d_len == 0)
{
return 0;
}
devif_out(dev);
bstop = devif_loopback(dev);
if (bstop)
{
return bstop;
}
if (callback)
{
#ifdef CONFIG_NET_IPFRAG
if (ip_fragout(dev) != OK)
{
netdev_iob_release(dev);
return 1;
}
else if (iob_peek_queue(&dev->d_fragout) != NULL)
{
return devif_poll_ipfrag(dev, callback);
}
#endif
return callback(dev);
}
return 0;
}
/****************************************************************************
* Name: devif_get_mtu
*
* Description:
* Get mtu
*
* Parameters:
* dev Ethernet driver device structure
*
* Return:
* return (Maximum packet size - Link layer header size),
* if PMTUD enable return pmtu
****************************************************************************/
uint16_t devif_get_mtu(FAR struct net_driver_s *dev)
{
if (dev->d_iob == NULL || dev->d_len == 0)
{
return dev->d_pktsize - dev->d_llhdrlen;
}
#if (defined(CONFIG_NET_IPv6) && \
defined(CONFIG_NET_ICMPv6) && \
!defined(CONFIG_NET_ICMPv6_NO_STACK) && \
CONFIG_NET_ICMPv6_PMTU_ENTRIES > 0)
if (IFF_IS_IPv6(dev->d_flags))
{
FAR struct ipv6_hdr_s *ipv6 = IPv6BUF;
if (!net_ipv6addr_cmp(ipv6->destipaddr, g_ipv6_unspecaddr))
{
FAR struct icmpv6_pmtu_entry *entry =
icmpv6_find_pmtu_entry(ipv6->destipaddr);
if (entry != NULL)
{
return entry->pmtu;
}
}
}
# endif
#if (defined(CONFIG_NET_IPv4) && \
defined(CONFIG_NET_ICMP) && \
!defined(CONFIG_NET_ICMP_NO_STACK) && \
CONFIG_NET_ICMP_PMTU_ENTRIES > 0)
if (IFF_IS_IPv4(dev->d_flags))
{
FAR struct ipv4_hdr_s *ipv4 = IPv4BUF;
if (!net_ipv4addr_cmp(ipv4->destipaddr, INADDR_ANY))
{
FAR struct icmp_pmtu_entry *entry =
icmpv4_find_pmtu_entry(net_ip4addr_conv32(ipv4->destipaddr));
if (entry != NULL)
{
return entry->pmtu;
}
}
}
# endif
return dev->d_pktsize - dev->d_llhdrlen;
}
#endif /* CONFIG_NET */