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If we pass down 64k - L2 hdr size + 1 to 64K L3+ data adding an ether

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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
This commit is contained in:
Bjoern A. Zeeb 2012-04-23 22:05:09 +00:00
parent 7a1421ee03
commit 39fc714a6f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=234620
1 changed files with 1 additions and 1 deletions
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2
sys/dev/ixgbe/ixgbe.h
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@ -179,7 +179,7 @@
#define IXGBE_82599_SCATTER 32
#define MSIX_82598_BAR 3
#define MSIX_82599_BAR 4
#define IXGBE_TSO_SIZE 65535
#define IXGBE_TSO_SIZE 262140
#define IXGBE_TX_BUFFER_SIZE ((u32) 1514)
#define IXGBE_RX_HDR 128
#define IXGBE_VFTA_SIZE 128