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authorwpaul <wpaul@FreeBSD.org>1999-08-24 03:19:45 +0000
committerwpaul <wpaul@FreeBSD.org>1999-08-24 03:19:45 +0000
commit19a3e3add0eeb9cd6220d0cb0c65cd9159a1ae53 (patch)
tree68ecfe229cb4634d1e73da46dd2902a637fa40bc /sys/pci/pci_ioctl.h
parent10d42c8b30de80d660675d510b8fc752666138bf (diff)
downloadFreeBSD-src-19a3e3add0eeb9cd6220d0cb0c65cd9159a1ae53.zip
FreeBSD-src-19a3e3add0eeb9cd6220d0cb0c65cd9159a1ae53.tar.gz
Change PN_RXLEN from 1518 bytes to 1536 bytes. The chip always DMAs data
in 4 byte chunks. It turns out that with the 82c169C on the Netgear FA-310TX Rev D2, if you tell the chip you have reserved a buffer of 1518 bytes, it will actually treat it as 1516 bytes since 1518 is divisible by four. Consequently, a packet of 1514 bytes will always end up consuming two buffers: the last coupleof bytes will spill over into the next descriptor. This causes the pn_rx_bug_war() routine to trip unnecessarily. I'm not sure if the 82c169B or 82c168 chips behave the same way; I'll have to check them. In any case, this change should work just as well with them. Note that the FA-310TX Rev D2 also has a Broadcom PHY instead of a Level One LXT970 PHY, however this shouldn't make any difference as far as the driver is concerned. This change also allows me to do a way with one rounding overation in pn_rx-buf_war().
Diffstat (limited to 'sys/pci/pci_ioctl.h')
0 files changed, 0 insertions, 0 deletions
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