If we pass down 64k - L2 hdr size + 1 to 64K L3+ data adding an ether
header will make the data go over the 64k limits announced to busdma as maxsize and the transaction will fail. With TSO this can result in a TCP regression due to the lost packet. According to the data sheets ixgbe(4) 82598 and 82599 can handle up to 256k so increase the maximum. Reported by: Jon Kåre Hellan, UNINETT (jon.kare.hellan uninett.no) Tested by: Jon Kåre Hellan, UNINETT (jon.kare.hellan uninett.no) MFC after: 1 week
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=234620
@ -179,7 +179,7 @@
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#define IXGBE_82599_SCATTER 32
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#define MSIX_82598_BAR 3
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#define MSIX_82599_BAR 4
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#define IXGBE_TSO_SIZE 65535
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#define IXGBE_TSO_SIZE 262140
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#define IXGBE_TX_BUFFER_SIZE ((u32) 1514)
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#define IXGBE_RX_HDR 128
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#define IXGBE_VFTA_SIZE 128
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