From 2d92865158d0e21ef4350703af64bc2a610d81d3 Mon Sep 17 00:00:00 2001 From: Vladimir Sokolovsky Date: Mon, 14 Jul 2008 23:48:53 -0700 Subject: 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 Signed-off-by: Vladimir Sokolovsky Signed-off-by: Roland Dreier --- drivers/net/mlx4/fw.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'drivers/net/mlx4/fw.h') diff --git a/drivers/net/mlx4/fw.h b/drivers/net/mlx4/fw.h index 306cb9b0242..a0e046c149b 100644 --- a/drivers/net/mlx4/fw.h +++ b/drivers/net/mlx4/fw.h @@ -38,6 +38,11 @@ #include "mlx4.h" #include "icm.h" +struct mlx4_mod_stat_cfg { + u8 log_pg_sz; + u8 log_pg_sz_m; +}; + struct mlx4_dev_cap { int max_srq_sz; int max_qp_sz; @@ -162,5 +167,6 @@ int mlx4_SET_ICM_SIZE(struct mlx4_dev *dev, u64 icm_size, u64 *aux_pages); int mlx4_MAP_ICM_AUX(struct mlx4_dev *dev, struct mlx4_icm *icm); int mlx4_UNMAP_ICM_AUX(struct mlx4_dev *dev); int mlx4_NOP(struct mlx4_dev *dev); +int mlx4_MOD_STAT_CFG(struct mlx4_dev *dev, struct mlx4_mod_stat_cfg *cfg); #endif /* MLX4_FW_H */ -- cgit v1.2.3