Mirrors_Framework/nuttx
1
0
Fork 0
mirror of https://github.com/apache/nuttx.git synced 2026-05-19 20:06:24 +08:00
Code Issues Actions 1 Packages Projects Releases Wiki Activity

net/: Struggling with MSS definitions.

Browse Source
This commit is contained in:
Gregory Nutt
2017-03-31 15:54:12 -06:00
parent 732f0855c6
commit 503f3e5477
1 changed files with 101 additions and 37 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/nuttx/net/netconfig.h
+101 -37
View File
@@ -295,47 +295,113 @@
#endif
/* The UDP maximum packet size. This is should not be to set to more
* than NET_DEV_MTU(d) - NET_LL_HDRLEN(dev) - IPv4UDP_HDRLEN.
* than NET_DEV_MTU(d) - NET_LL_HDRLEN(dev) - IPv*_HDRLEN.
*
* REVISIT: It is unclear to me if the UDP_HDRLEN should subtracted
* or not.
*/
#define UDP_MSS(d,h) (NET_DEV_MTU(d) - NET_LL_HDRLEN(d) - (h))
/* If Ethernet is supported, then it will have the smaller MSS */
#if defined(CONFIG_NET_SLIP)
# define SLIP_UDP_MSS(h) (CONFIG_NET_SLIP_MTU - (h))
# define __MIN_UDP_MSS(h) SLIP_UDP_MSS(h)
#elif defined(CONFIG_NET_LOOPBACK)
# define LO_UDP_MSS(h) (NET_LO_MTU - (h))
# define __MIN_UDP_MSS(h) LO_UDP_MSS(h)
#endif
#define UDP_MSS(d,h) (NET_DEV_MTU(d) - NET_LL_HDRLEN(d) (h))
#ifdef CONFIG_NET_ETHERNET
# define ETH_UDP_MSS(h) (CONFIG_NET_ETH_MTU - ETH_HDRLEN - (h))
# undef __MIN_UDP_MSS
# define __MIN_UDP_MSS(h) ETH_UDP_MSS(h)
# define __MAX_UDP_MSS(h) ETH_UDP_MSS(h)
# define ETH_UDP_MSS(h) (CONFIG_NET_ETH_MTU - ETH_HDRLEN - (h))
# ifndef CONFIG_NET_MULTILINK
# define __MIN_UDP_MSS(h) ETH_UDP_MSS(h)
# define __MAX_UDP_MSS(h) ETH_UDP_MSS(h)
# endif
#endif
/* If SLIP is supported, then it will have the larger MSS */
#ifdef CONFIG_NET_6LOWPAN
# define IEEE802154_UDP_MSS(h) (CONFIG_NET_6LOWPAN_MAXPAYLOAD - (h))
# ifndef CONFIG_NET_MULTILINK
# define __MIN_UDP_MSS(h) IEEE802154_UDP_MSS(h)
# define __MAX_UDP_MSS(h) IEEE802154_UDP_MSS(h)
# endif
#endif
#ifdef CONFIG_NET_LOOPBACK
# define LO_UDP_MSS(h) (NET_LO_MTU - (h))
# ifndef CONFIG_NET_MULTILINK
# define __MIN_UDP_MSS(h) LO_UDP_MSS(h)
# define __MAX_UDP_MSS(h) LO_UDP_MSS(h)
# endif
#endif
#ifdef CONFIG_NET_SLIP
# undef __MAX_UDP_MSS
# define __MAX_UDP_MSS(h) SLIP_UDP_MSS(h)
# define SLIP_UDP_MSS(h) (CONFIG_NET_SLIP_MTU - (h))
# ifndef CONFIG_NET_MULTILINK
# define __MIN_UDP_MSS(h) SLIP_UDP_MSS(h)
# define __MAX_UDP_MSS(h) SLIP_UDP_MSS(h)
# endif
#endif
/* If IPv4 is supported, it will have the larger MSS */
#ifdef CONFIG_NET_MULTILINK
# undef __LAST_MIN_UDP_MSS
# undef __LAST_MAX_UDP_MSS
#ifdef CONFIG_NET_IPv6
# define UDP_IPv6_MSS(d) UDP_MSS(d,IPv6_HDRLEN)
# define ETH_IPv6_UDP_MSS ETH_UDP_MSS(IPv6_HDRLEN)
# define SLIP_IPv6_UDP_MSS SLIP_UDP_MSS(IPv6_HDRLEN)
# ifdef CONFIG_NET_ETHERNET
# ifdef __LAST_MIN_UDP_MSS
# define __MIN_UDP_MSS(h) MIN(ETH_UDP_MSS(h),__LAST_MIN_UDP_MSS(h))
# define __MAX_UDP_MSS(h) MAX(ETH_UDP_MSS(h),__LAST_MAX_UDP_MSS(h))
# else
# define __MIN_UDP_MSS(h) ETH_UDP_MSS(h)
# define __MAX_UDP_MSS(h) ETH_UDP_MSS(h)
# endif
# undef __LAST_MIN_UDP_MSS
# undef __LAST_MAX_UDP_MSS
# define __LAST_MIN_UDP_MSS(h) __MIN_UDP_MSS(h)
# define __LAST_MAX_UDP_MSS(h) __MAX_UDP_MSS(h)
# endif
# define MAX_IPv6_UDP_MSS __MAX_UDP_MSS(IPv6_HDRLEN)
# define MAX_UDP_MSS __MAX_UDP_MSS(IPv6_HDRLEN)
# ifdef CONFIG_NET_6LOWPAN
# ifdef __LAST_MIN_UDP_MSS
# define __MIN_UDP_MSS(h) MIN(IEEE802154_UDP_MSS(h),__LAST_MIN_UDP_MSS(h))
# define __MAX_UDP_MSS(h) MAX(IEEE802154_UDP_MSS(h),__LAST_MAX_UDP_MSS(h))
# else
# define __MIN_UDP_MSS(h) IEEE802154_UDP_MSS(h)
# define __MAX_UDP_MSS(h) IEEE802154_UDP_MSS(h)
# endif
# undef __LAST_MIN_UDP_MSS
# undef __LAST_MAX_UDP_MSS
# define __LAST_MIN_UDP_MSS(h) __MIN_UDP_MSS(h)
# define __LAST_MAX_UDP_MSS(h) __MAX_UDP_MSS(h)
# endif
# ifdef CONFIG_NET_LOOPBACK
# ifdef __LAST_MIN_UDP_MSS
# define __MIN_UDP_MSS(h) MIN(LO_UDP_MSS(h),__LAST_MIN_UDP_MSS(h))
# define __MAX_UDP_MSS(h) MAX(LO_UDP_MSS(h),__LAST_MAX_UDP_MSS(h))
# else
# define __MIN_UDP_MSS(h) LO_UDP_MSS(h)
# define __MAX_UDP_MSS(h) LO_UDP_MSS(h)
# endif
# undef __LAST_MIN_UDP_MSS
# undef __LAST_MAX_UDP_MSS
# define __LAST_MIN_UDP_MSS(h) __MIN_UDP_MSS(h)
# define __LAST_MAX_UDP_MSS(h) __MAX_UDP_MSS(h)
# endif
# ifdef CONFIG_NET_SLIP
# ifdef __LAST_MIN_UDP_MSS
# define __MIN_UDP_MSS(h) MIN(SLIP_UDP_MSS(h),__LAST_MIN_UDP_MSS(h))
# define __MAX_UDP_MSS(h) MAX(SLIP_UDP_MSS(h),__LAST_MAX_UDP_MSS(h))
# else
# define __MIN_UDP_MSS(h) SLIP_UDP_MSS(h)
# define __MAX_UDP_MSS(h) SLIP_UDP_MSS(h)
# endif
# undef __LAST_MIN_UDP_MSS
# undef __LAST_MAX_UDP_MSS
# define __LAST_MIN_UDP_MSS(h) __MIN_UDP_MSS(h)
# define __LAST_MAX_UDP_MSS(h) __MAX_UDP_MSS(h)
# endif
# undef __LAST_MIN_UDP_MSS
# undef __LAST_MAX_UDP_MSS
#endif
#ifdef CONFIG_NET_IPv4
/* NOTE: MSS calcuation excludes the UDP_HDRLEN. */
#ifdef CONFIG_NET_IPv4
# define UDP_IPv4_MSS(d) UDP_MSS(d,IPv4_HDRLEN)
# define ETH_IPv4_UDP_MSS ETH_UDP_MSS(IPv4_HDRLEN)
# define SLIP_IPv4_UDP_MSS SLIP_UDP_MSS(IPv4_HDRLEN)
@@ -422,12 +488,15 @@
* link layer protocols (CONFIG_NET_MULTILINK), each network device
* may support a different UDP MSS value. Here we arbitrarily select
* the minimum MSS for that case.
*
* REVISIT: It is unclear to me if the TCP_HDRLEN should subtracted
* or not.
*/
#define TCP_MSS(d,h) (NET_DEV_MTU(d) - NET_LL_HDRLEN(d) - TCP_HDRLEN - (h))
#define TCP_MSS(d,h) (NET_DEV_MTU(d) - NET_LL_HDRLEN(d) - (h))
#define LO_TCP_MSS(h) (NET_LO_MTU - (h))
/* Get the smallest and largest */
/* Get the smallest and largest MSS */
#ifdef CONFIG_NET_ETHERNET
# define ETH_TCP_MSS(h) (CONFIG_NET_ETH_MTU - ETH_HDRLEN - (h))
@@ -525,14 +594,9 @@
# undef __LAST_MAX_TCP_MSS
#endif
/* If SLIP is supported, then it will have the larger MSS */
#ifdef CONFIG_NET_SLIP
# undef __MAX_TCP_MSS
# define __MAX_TCP_MSS(h) SLIP_TCP_MSS(h)
#endif
/* If IPv4 is support, it will have the larger MSS */
/* If IPv4 is supported, it will have the larger MSS.
* NOTE: MSS calcuation excludes the TCP_HDRLEN.
*/
#ifdef CONFIG_NET_IPv6
# define TCP_IPv6_MSS(d) TCP_MSS(d,IPv6_HDRLEN)