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| author | Vladimir Sokolovsky | 2008-07-15 08:48:53 +0200 |
|---|---|---|
| committer | Roland Dreier | 2008-07-15 08:48:53 +0200 |
| commit | 2d92865158d0e21ef4350703af64bc2a610d81d3 (patch) | |
| tree | 8b11b29982ccff35bc6810e5a57c568ce1a4ada0 /drivers/net/mlx4/main.c | |
| parent | RDMA/cma: Simplify locking needed for serialization of callbacks (diff) | |
| download | kernel-qcow2-linux-2d92865158d0e21ef4350703af64bc2a610d81d3.tar.gz kernel-qcow2-linux-2d92865158d0e21ef4350703af64bc2a610d81d3.tar.xz kernel-qcow2-linux-2d92865158d0e21ef4350703af64bc2a610d81d3.zip | |
mlx4_core: Use MOD_STAT_CFG command to get minimal page size
There was a bug in some versions of the mlx4 driver in
mlx4_alloc_fmr(), which hardcoded the minimum acceptable page_shift to
be 12. However, new ConnectX firmware can support a minimum
page_shift of 9 (log_pg_sz of 9 returned by QUERY_DEV_LIM) -- so with
old drivers, ib_fmr_alloc() would fail for ULPs using the device
minimum when creating FMRs.
To preserve firmware compatibility with released mlx4 drivers, the
firmware will continue to return 12 as before for log_page_sz in
QUERY_DEV_CAP for these drivers. However, to enable new drivers to
take advantage of the available smaller page size, the mlx4 driver now
first sets the log_pg_sz to the device minimum by setting a
log_page_sz value to 0 via the MOD_STAT_CFG command and then reading
the real minimum via QUERY_DEV_CAP.
Signed-off-by: Jack Morgenstein <jackm@mellanox.co.il>
Signed-off-by: Vladimir Sokolovsky <vlad@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/net/mlx4/main.c')
| -rw-r--r-- | drivers/net/mlx4/main.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/net/mlx4/main.c b/drivers/net/mlx4/main.c index a6aa49fc1d68..d3736013fe9b 100644 --- a/drivers/net/mlx4/main.c +++ b/drivers/net/mlx4/main.c @@ -485,6 +485,7 @@ static int mlx4_init_hca(struct mlx4_dev *dev) struct mlx4_priv *priv = mlx4_priv(dev); struct mlx4_adapter adapter; struct mlx4_dev_cap dev_cap; + struct mlx4_mod_stat_cfg mlx4_cfg; struct mlx4_profile profile; struct mlx4_init_hca_param init_hca; u64 icm_size; @@ -502,6 +503,12 @@ static int mlx4_init_hca(struct mlx4_dev *dev) return err; } + mlx4_cfg.log_pg_sz_m = 1; + mlx4_cfg.log_pg_sz = 0; + err = mlx4_MOD_STAT_CFG(dev, &mlx4_cfg); + if (err) + mlx4_warn(dev, "Failed to override log_pg_sz parameter\n"); + err = mlx4_dev_cap(dev, &dev_cap); if (err) { mlx4_err(dev, "QUERY_DEV_CAP command failed, aborting.\n"); |