34d2cde8a8
1. Add new config CONFIG_NET_LL_GUARDSIZE to isolation of l2 stack,
which will benefit l3(IP) layer for multi-MAC(l2) implementation,
especially in some NICs such as celluler net driver.
new configuration options: CONFIG_NET_LL_GUARDSIZE
CONFIG_NET_LL_GUARDSIZE will reserved l2 buffer header size of
network buffer to isolate the L2/L3 (MAC/IP) data on network layer,
which will be beneficial to L3 network layer protocol transparent
transmission and forwarding
------------------------------------------------------------
Layout of frist iob entry:
iob_data (aligned by CONFIG_IOB_ALIGNMENT)
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| io_offset(CONFIG_NET_LL_GUARDSIZE)
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-------------------------------------------------
iob | Reserved | io_len |
-------------------------------------------------
-------------------------------------------------------------
Layout of different NICs implementation:
iob_data (aligned by CONFIG_IOB_ALIGNMENT)
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| io_offset(CONFIG_NET_LL_GUARDSIZE)
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-------------------------------------------------
Ethernet | Reserved | ETH_HDRLEN | io_len |
---------------------------------|---------------
8021Q | Reserved | ETH_8021Q_HDRLEN | io_len |
---------------------------------|---------------
ipforward | Reserved | io_len |
-------------------------------------------------
--------------------------------------------------------------------
2. Support iob offload to l2 driver to avoid unnecessary memory copy
Support send/receive iob vectors directly between the NICs and l3/l4
stack to avoid unnecessary memory copies, especially on hardware that
supports Scatter/gather, which can greatly improve performance.
new interface to support iob offload:
------------------------------------------
| IOB version | original |
|----------------------------------------|
| devif_iob_poll() | devif_poll() |
| ... | ... |
------------------------------------------
--------------------------------------------------------------------
1> NIC hardware support Scatter/gather transfer
TX:
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
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dev->d_iob: |
--------------- ---------------
io_data iob1 | | | iob3 | | |
\ --------------- ---------------
--------------- | --------------- |
iob0 | | | | iob2 | | | |
--------------- | --------------- |
\ | / /
\ | / /
----------------------------------------------
NICs io vector | | | | | | | | | |
----------------------------------------------
RX:
[tcp|udp|icmp|...]ipv[4|6]_data_handler()(iob_concat/append to readahead)
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[tcp|udp|icmp|...]_ipv[4|6]_in()/...
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pkt/ipv[4/6]_input()/...
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NICs io vector receive(iov_base to each iobs)
--------------------------------------------------------------------
2> CONFIG_IOB_BUFSIZE is greater than MTU:
TX:
"(CONFIG_IOB_BUFSIZE) > (MAX_NETDEV_PKTSIZE + CONFIG_NET_GUARDSIZE + CONFIG_NET_LL_GUARDSIZE)"
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
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"NIC"_send()
(dev->d_iob->io_data[CONFIG_NET_LL_GUARDSIZE - NET_LL_HDRLEN(dev)])
RX:
[tcp|udp|icmp|...]ipv[4|6]_data_handler()(iob_concat/append to readahead)
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[tcp|udp|icmp|...]_ipv[4|6]_in()/...
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pkt/ipv[4/6]_input()/...
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NICs io vector receive(iov_base to io_data)
--------------------------------------------------------------------
3> Compatible with all old flat buffer NICs
TX:
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() /* new interface, gather iobs to flat buffer */
/ \
/ \
devif_poll("NIC"_txpoll) "NIC"_send()(dev->d_buf)
RX:
[tcp|udp|icmp|...]ipv[4|6]_data_handler()(iob_concat/append to readahead)
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[tcp|udp|icmp|...]_ipv[4|6]_in()/...
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netdev_input() /* new interface, Scatter/gather flat/iob buffer */
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pkt/ipv[4|6]_input()/...
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NICs io vector receive(Orignal flat buffer)
3. Iperf passthrough on NuttX simulator:
-------------------------------------------------
| Protocol | Server | Client | |
|-----------------------------------------------|
| TCP | 813 | 834 | Mbits/sec |
| TCP(Offload) | 1720 | 1100 | Mbits/sec |
| UDP | 22 | 757 | Mbits/sec |
| UDP(Offload) | 25 | 1250 | Mbits/sec |
-------------------------------------------------
Signed-off-by: chao an <anchao@xiaomi.com>
128 lines
3.9 KiB
C
128 lines
3.9 KiB
C
/****************************************************************************
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* net/icmpv6/icmpv6_advertise.c
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* Send an ICMPv6 Neighbor Advertisement
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <string.h>
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#include <debug.h>
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#include <nuttx/net/netconfig.h>
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#include <nuttx/net/netstats.h>
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#include <nuttx/net/netdev.h>
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#include <nuttx/net/net.h>
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#include <nuttx/net/icmpv6.h>
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#include "netdev/netdev.h"
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#include "utils/utils.h"
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#include "icmpv6/icmpv6.h"
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#include "inet/inet.h"
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#ifdef CONFIG_NET_ICMPv6
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: icmpv6_advertise
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*
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* Description:
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* Send an ICMPv6 Neighbor Advertisement
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*
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* Input Parameters:
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* dev - The device driver structure containing the outgoing ICMPv6 packet
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* buffer
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* The network is locked
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*
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****************************************************************************/
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void icmpv6_advertise(FAR struct net_driver_s *dev,
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const net_ipv6addr_t destipaddr)
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{
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FAR struct icmpv6_neighbor_advertise_s *adv;
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uint16_t lladdrsize;
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uint16_t l3size;
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/* Length excludes the IPv6 header */
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lladdrsize = netdev_lladdrsize(dev);
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l3size = SIZEOF_ICMPV6_NEIGHBOR_ADVERTISE_S(lladdrsize);
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ipv6_build_header(IPv6BUF, l3size, IP_PROTO_ICMP6,
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dev->d_ipv6addr, destipaddr, 255);
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/* Set up the ICMPv6 Neighbor Advertise response */
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adv = IPBUF(IPv6_HDRLEN);
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adv->type = ICMPv6_NEIGHBOR_ADVERTISE; /* Message type */
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adv->code = 0; /* Message qualifier */
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adv->flags[0] = ICMPv6_NADV_FLAG_S |
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ICMPv6_NADV_FLAG_O; /* Solicited+Override flags. */
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adv->flags[1] = 0;
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adv->flags[2] = 0;
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adv->flags[3] = 0;
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/* Copy the target address into the Neighbor Advertisement message */
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net_ipv6addr_copy(adv->tgtaddr, dev->d_ipv6addr);
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/* Set up the options */
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adv->opttype = ICMPv6_OPT_TGTLLADDR; /* Option type */
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adv->optlen = ICMPv6_OPT_OCTECTS(lladdrsize); /* Option length in octets */
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/* Copy our link layer address into the message */
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memcpy(adv->tgtlladdr, &dev->d_mac, lladdrsize);
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/* Update device buffer length */
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iob_update_pktlen(dev->d_iob, IPv6_HDRLEN + l3size);
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/* Calculate the checksum over both the ICMP header and payload */
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adv->chksum = 0;
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adv->chksum = ~icmpv6_chksum(dev, IPv6_HDRLEN);
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/* Set the size to the size of the IPv6 header and the payload size */
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dev->d_len = IPv6_HDRLEN + l3size;
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ninfo("Outgoing ICMPv6 Neighbor Advertise length: %d\n", dev->d_len);
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#ifdef CONFIG_NET_STATISTICS
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g_netstats.icmpv6.sent++;
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g_netstats.ipv6.sent++;
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#endif
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}
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#endif /* CONFIG_NET_ICMPv6 */
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