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H A Dif_mskreg.hdiff 205091 Fri Mar 12 16:42:09 MST 2010 yongari Implement Rx checksum offloading for Yukon EC, Yukon Ultra,
Yukon FE and Yukon Ultra2. These controllers provide very simple
checksum computation mechanism and it requires additional pseudo
header checksum computation in upper stack. Even though I couldn't
see much performance difference with/without Rx checksum offloading
it may help notebook based controllers.

Actually controller can compute two checksum value by giving
different starting position of checksum computation on received
frame. However, for long time, Marvell's checksum offloading engine
have been known to have several silicon bugs so don't blindly trust
computed partial checksum value. Instead, compute partial checksum
twice by giving the same checksum computation position and compare
the result. If the value is different it's clear indication of
hardware bug. This configuration lose IP checksum offloading
capability but I think it's better to take safe route.
Note, Rx checksum offloading for Yukon XL was still disabled due to
known silicon bug.
H A Dif_msk.cdiff 205091 Fri Mar 12 16:42:09 MST 2010 yongari Implement Rx checksum offloading for Yukon EC, Yukon Ultra,
Yukon FE and Yukon Ultra2. These controllers provide very simple
checksum computation mechanism and it requires additional pseudo
header checksum computation in upper stack. Even though I couldn't
see much performance difference with/without Rx checksum offloading
it may help notebook based controllers.

Actually controller can compute two checksum value by giving
different starting position of checksum computation on received
frame. However, for long time, Marvell's checksum offloading engine
have been known to have several silicon bugs so don't blindly trust
computed partial checksum value. Instead, compute partial checksum
twice by giving the same checksum computation position and compare
the result. If the value is different it's clear indication of
hardware bug. This configuration lose IP checksum offloading
capability but I think it's better to take safe route.
Note, Rx checksum offloading for Yukon XL was still disabled due to
known silicon bug.

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