diff options
| author | Roland Dreier <rolandd@cisco.com> | 2007-06-18 08:13:48 -0700 |
|---|---|---|
| committer | Roland Dreier <rolandd@cisco.com> | 2007-06-18 08:13:48 -0700 |
| commit | 0e6e74162164d908edf7889ac66dca09e7505745 (patch) | |
| tree | 7828d670c099771492dac599f8a7323c4e681e52 /drivers/infiniband/hw/mlx4/user.h | |
| parent | 42c059ea2b0aac5f961253ba81c1b464d181a600 (diff) | |
| download | linux-0e6e74162164d908edf7889ac66dca09e7505745.tar.bz2 | |
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>
Diffstat (limited to 'drivers/infiniband/hw/mlx4/user.h')
| -rw-r--r-- | drivers/infiniband/hw/mlx4/user.h | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/infiniband/hw/mlx4/user.h b/drivers/infiniband/hw/mlx4/user.h index 88c72d56368b..e2d11be4525c 100644 --- a/drivers/infiniband/hw/mlx4/user.h +++ b/drivers/infiniband/hw/mlx4/user.h @@ -39,7 +39,7 @@ * Increment this value if any changes that break userspace ABI * compatibility are made. */ -#define MLX4_IB_UVERBS_ABI_VERSION 2 +#define MLX4_IB_UVERBS_ABI_VERSION 3 /* * Make sure that all structs defined in this file remain laid out so @@ -87,9 +87,10 @@ struct mlx4_ib_create_srq_resp { struct mlx4_ib_create_qp { __u64 buf_addr; __u64 db_addr; - __u8 log_sq_bb_count; - __u8 log_sq_stride; - __u8 reserved[6]; + __u8 log_sq_bb_count; + __u8 log_sq_stride; + __u8 sq_no_prefetch; + __u8 reserved[5]; }; #endif /* MLX4_IB_USER_H */ |