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Igbe: Newer kernels seem to allow TSO headers and packet data to be in one desc

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Implement some code we used to panic on as it actually does happen with the
e1000 driver in Linux 3.3+. We used to assume that a TSO header would never
be part of a larger payload, however it appears as though it now can be.
This commit is contained in:
Ali Saidi 2012-09-07 14:20:53 -05:00
parent 124aac72b4
commit 5217d5a451
1 changed files with 3 additions and 5 deletions
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8
src/dev/i8254xGBe.cc
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@ -1650,11 +1650,9 @@ IGbE::TxDescCache::headerComplete()
unusedCache.pop_front();
usedCache.push_back(desc);
} else {
// I don't think this case happens, I think the headrer is always
// it's own packet, if it wasn't it might be as simple as just
// incrementing descBytesUsed by the header length, but I'm not
// completely sure
panic("TSO header part of bigger packet, not implemented\n");
DPRINTF(EthernetDesc, "TSO: header part of larger payload\n");
tsoDescBytesUsed = tsoHeaderLen;
tsoLoadedHeader = true;
}
enableSm();
igbe->checkDrain();