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net/tcp and sixlowpan: Separate the the TCP receive window calculatio…
…ns to a separate header file. It must also be used by the special 6LoWPAN TCP logic.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,7 +1,7 @@ | ||
| /**************************************************************************** | ||
| * net/sixlowpan/sixlowpan_tcpsend.c | ||
| * | ||
| * Copyright (C) 2017 Gregory Nutt. All rights reserved. | ||
| * Copyright (C) 2017-2018 Gregory Nutt. All rights reserved. | ||
| * Author: Gregory Nutt <[email protected]> | ||
| * | ||
| * Redistribution and use in source and binary forms, with or without | ||
|
|
@@ -267,6 +267,12 @@ static int sixlowpan_tcp_header(FAR struct tcp_conn_s *conn, | |
| } | ||
| else | ||
| { | ||
| /* Update the TCP received window based on I/O buffer availability */ | ||
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| tcp_update_recvwindws(dev); | ||
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| /* Set the TCP Window */ | ||
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| ipv6tcp->tcp.wnd[0] = ((NET_DEV_RCVWNDO(dev)) >> 8); | ||
| ipv6tcp->tcp.wnd[1] = ((NET_DEV_RCVWNDO(dev)) & 0xff); | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,150 @@ | ||
| /**************************************************************************** | ||
| * net/tcp/tcp_recvwindow.c | ||
| * | ||
| * Copyright (C) 2018 Gregory Nutt. All rights reserved. | ||
| * Author: Gregory Nutt <[email protected]> | ||
| * | ||
| * 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. | ||
| * | ||
| ****************************************************************************/ | ||
|
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| /**************************************************************************** | ||
| * Included Files | ||
| ****************************************************************************/ | ||
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| #include <nuttx/config.h> | ||
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| #include <stdint.h> | ||
| #include <debug.h> | ||
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| #include <net/if.h> | ||
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| #include <nuttx/mm/iob.h> | ||
| #include <nuttx/net/netconfig.h> | ||
| #include <nuttx/net/netdev.h> | ||
| #include <nuttx/net/tcp.h> | ||
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| #include "tcp/tcp.h" | ||
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| #ifdef CONFIG_NET_TCP_RWND_CONTROL | ||
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| /**************************************************************************** | ||
| * Public Functions | ||
| ****************************************************************************/ | ||
|
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| /**************************************************************************** | ||
| * Name: tcp_update_recvwindws | ||
| * | ||
| * Description: | ||
| * Update the TCP receive window for the specified device. | ||
| * | ||
| * Input Parameters: | ||
| * dev - The device whose TCP receive window will be updated. | ||
| * | ||
| * Returned Value: | ||
| * None. | ||
| * | ||
| ****************************************************************************/ | ||
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| void tcp_update_recvwindws(FAR struct net_driver_s *dev) | ||
| { | ||
| uint16_t iplen; | ||
| uint16_t overhead; | ||
| int navail; | ||
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| #ifdef CONFIG_NET_IPv6 | ||
| #ifdef CONFIG_NET_IPv4 | ||
| if (IFF_IS_IPv6(dev->d_flags)) | ||
| #endif | ||
| { | ||
| iplen = IPv6_HDRLEN; | ||
| } | ||
| #endif /* CONFIG_NET_IPv6 */ | ||
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| #ifdef CONFIG_NET_IPv4 | ||
| #ifdef CONFIG_NET_IPv6 | ||
| else | ||
| #endif | ||
| { | ||
| iplen = IPv4_HDRLEN; | ||
| } | ||
| #endif /* CONFIG_NET_IPv4 */ | ||
|
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| /* Update the TCP received window based on I/O buffer availability | ||
| * | ||
| * REVISIT: The actual TCP header length is varialble. TCP_HDRLEN | ||
| * is the minimum size. | ||
| */ | ||
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| overhead = NET_LL_HDRLEN(dev) + iplen + TCP_HDRLEN; | ||
| navail = iob_navail(); | ||
| if (navail > 0) | ||
| { | ||
| uint32_t rwnd; | ||
|
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| /* The optimal TCP window size is the amount of TCP data that we can | ||
| * currently buffer via TCP read-ahead buffering minus overhead for the | ||
| * link-layer, IP, and TCP headers. This logic here assumes that | ||
| * all IOBs are available for TCP buffering. | ||
| * | ||
| * Assume that all of the available IOBs are can be used for buffering | ||
| * on this connection. Also assume that at least one chain is available | ||
| * concatenate the IOBs. | ||
| * | ||
| * REVISIT: In an environment with multiple, active read-ahead TCP | ||
| * sockets (and perhaps multiple network devices) or if there are | ||
| * other consumers of IOBs (such as for TCP write buffering) then the | ||
| * total number of IOBs will all not be available for read-ahead | ||
| * buffering for this connection. | ||
| */ | ||
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| rwnd = (navail * CONFIG_IOB_BUFSIZE) - overhead; | ||
| if (rwnd > UINT16_MAX) | ||
| { | ||
| rwnd = UINT16_MAX; | ||
| } | ||
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| /* Save the new receive window size */ | ||
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| NET_DEV_RCVWNDO(dev) = (uint16_t)rwnd; | ||
| } | ||
| else /* if (navail == 0) */ | ||
| { | ||
| /* No IOBs are available... fall back to the configured default | ||
| * which assumes no write buffering. The only buffering available | ||
| * is within the packet buffer itself. | ||
| * | ||
| * NOTE: If no IOBs are available, then the next packet will be | ||
| * lost if there is no listener on the connection. | ||
| */ | ||
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| NET_DEV_RCVWNDO(dev) = dev->d_mtu - overhead; | ||
| } | ||
| } | ||
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| #endif /* CONFIG_NET_TCP_RWND_CONTROL */ |
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