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lwip: rework the tcp ooseq handling.

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It now accounts for the number of rx pool buffers used and the
available memory when deciding the number of ooseq buffers to retain.

Enable the TCP Selective ACK support which appears to help a lot on
lossy wifi when using the OOSEQ option.
This commit is contained in:
Our Air Quality 2017-09-03 20:10:22 +10:00
parent 1bfa6c4364
commit f5817aef01
4 changed files with 135 additions and 13 deletions
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61
lwip/include/lwipopts.h
View file

@ -307,6 +307,13 @@
#define TCP_QUEUE_OOSEQ 1
#endif
/**
* LWIP_TCP_SACK_OUT==1: TCP will support sending selective acknowledgements (SACKs).
*/
#ifndef LWIP_TCP_SACK_OUT
#define LWIP_TCP_SACK_OUT 1
#endif
/**
* TCP_MSS: TCP Maximum segment size. (default is 536, a conservative default,
* you might want to increase this.)
@ -319,23 +326,21 @@
#endif
/**
* TCP_OOSEQ_MAX_BYTES: The maximum number of bytes queued on ooseq per pcb.
* Default is 0 (no limit). Only valid for TCP_QUEUE_OOSEQ==1.
* TCP_OOSEQ_MAX_BYTES(n):
* Return the maximum number of bytes to be queued on ooseq per pcb, given the
* current number queued on a pcb. Only valid for TCP_QUEUE_OOSEQ==1.
*/
#ifndef TCP_OOSEQ_MAX_BYTES
#if TCP_OOSEQ_MAX_BYTES
#define TCP_OOSEQ_MAX_BYTES (2 * TCP_MSS)
#endif
#define TCP_OOSEQ_MAX_BYTES(n) ooseq_max_bytes(n)
#endif
/**
* TCP_OOSEQ_MAX_PBUFS: The maximum number of pbufs queued on ooseq per pcb.
* Default is 0 (no limit). Only valid for TCP_QUEUE_OOSEQ==1.
* TCP_OOSEQ_MAX_PBUFS(n):
* Return the maximum number of pbufs to be queued on ooseq per pcb, given the
* current number queued on a pcb. Only valid for TCP_QUEUE_OOSEQ==1.
*/
#ifndef TCP_OOSEQ_MAX_PBUFS
#if TCP_OOSEQ_MAX_PBUFS
#define TCP_OOSEQ_MAX_PBUFS 2
#endif
#define TCP_OOSEQ_MAX_PBUFS(n) ooseq_max_pbufs(n)
#endif
/**
@ -354,6 +359,42 @@
#define TCP_DEFAULT_LISTEN_BACKLOG 2
#endif
/**
* TCP_OVERSIZE: The maximum number of bytes that tcp_write may
* allocate ahead of time in an attempt to create shorter pbuf chains
* for transmission. The meaningful range is 0 to TCP_MSS. Some
* suggested values are:
*
* 0: Disable oversized allocation. Each tcp_write() allocates a new
pbuf (old behaviour).
* 1: Allocate size-aligned pbufs with minimal excess. Use this if your
* scatter-gather DMA requires aligned fragments.
* 128: Limit the pbuf/memory overhead to 20%.
* TCP_MSS: Try to create unfragmented TCP packets.
* TCP_MSS/4: Try to create 4 fragments or less per TCP packet.
*/
#ifndef TCP_OVERSIZE
#define TCP_OVERSIZE TCP_MSS
#endif
/**
* LWIP_TCP_TIMESTAMPS==1: support the TCP timestamp option.
* The timestamp option is currently only used to help remote hosts, it is not
* really used locally. Therefore, it is only enabled when a TS option is
* received in the initial SYN packet from a remote host.
*/
#ifndef LWIP_TCP_TIMESTAMPS
#define LWIP_TCP_TIMESTAMPS 1
#endif
/**
* TCP_WND_UPDATE_THRESHOLD: difference in window to trigger an
* explicit window update
*/
#ifndef TCP_WND_UPDATE_THRESHOLD
#define TCP_WND_UPDATE_THRESHOLD LWIP_MIN((TCP_WND / 4), (TCP_MSS * 4))
#endif
/*
----------------------------------
---------- Pbuf options ----------