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authorRoland Dreier <rolandd@cisco.com>2007-06-18 08:13:48 -0700
committerRoland Dreier <rolandd@cisco.com>2007-06-18 08:13:48 -0700
commit0e6e74162164d908edf7889ac66dca09e7505745 (patch)
tree7828d670c099771492dac599f8a7323c4e681e52 /drivers/infiniband/hw/cxgb3/Makefile
parent42c059ea2b0aac5f961253ba81c1b464d181a600 (diff)
IB/mlx4: Handle new FW requirement for send request prefetching
New ConnectX firmware introduces FW command interface revision 2, which requires that for each QP, a chunk of send queue entries (the "headroom") is kept marked as invalid, so that the HCA doesn't get confused if it prefetches entries that haven't been posted yet. Add code to the driver to do this, and also update the user ABI so that userspace can request that the prefetcher be turned off for userspace QPs (we just leave the prefetcher on for all kernel QPs). Unfortunately, marking send queue entries this way is confuses older firmware, so we change the driver to allow only FW command interface revisions 2. This means that users will have to update their firmware to work with the new driver, but the firmware is changing quickly and the old firmware has lots of other bugs anyway, so this shouldn't be too big a deal. Based on a patch from Jack Morgenstein <jackm@dev.mellanox.co.il>. Signed-off-by: Roland Dreier <rolandd@cisco.com>
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