Re: ATH max packet size?

Sten Daniel Sørsdal wrote:
I am still waiting for my PCI -> MiniPCI bridge for my CM9 card so i am unable to test this, and even though i read the source i am still unsure, so i was hoping a kind generous soul would answer my question;

What is the max packet size (mtu) available using the ath driver?

The reason i ask is, i want to setup a tunnel between two units and optimally not have to deal with any fragmentation issues.


From net80211/ieee80211.h:

/*
* Maximum acceptable MTU is:
* IEEE80211_MAX_LEN - WEP overhead - CRC -
* QoS overhead - RSN/WPA overhead
* Min is arbitrarily chosen > IEEE80211_MIN_LEN. The default
* mtu is Ethernet-compatible; it's set by ether_ifattach.
*/
#define IEEE80211_MTU_MAX 2290
#define IEEE80211_MTU_MIN 32

ath can actually handle very large packets (64K I believe) but the current driver won't chain rx descriptors together so it's limited to an mbuf cluster (2K).

Sam
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