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mlx4_core: Use MOD_STAT_CFG command to get minimal page size

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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>
This commit is contained in:
Vladimir Sokolovsky 2008-07-14 23:48:53 -07:00 committed by Roland Dreier
parent de910bd921
commit 2d92865158
3 changed files with 41 additions and 0 deletions
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28
drivers/net/mlx4/fw.c
View File

@ -101,6 +101,34 @@ static void dump_dev_cap_flags(struct mlx4_dev *dev, u32 flags)
mlx4_dbg(dev, " %s\n", fname[i]);
}
int mlx4_MOD_STAT_CFG(struct mlx4_dev *dev, struct mlx4_mod_stat_cfg *cfg)
{
struct mlx4_cmd_mailbox *mailbox;
u32 *inbox;
int err = 0;
#define MOD_STAT_CFG_IN_SIZE 0x100
#define MOD_STAT_CFG_PG_SZ_M_OFFSET 0x002
#define MOD_STAT_CFG_PG_SZ_OFFSET 0x003
mailbox = mlx4_alloc_cmd_mailbox(dev);
if (IS_ERR(mailbox))
return PTR_ERR(mailbox);
inbox = mailbox->buf;
memset(inbox, 0, MOD_STAT_CFG_IN_SIZE);
MLX4_PUT(inbox, cfg->log_pg_sz, MOD_STAT_CFG_PG_SZ_OFFSET);
MLX4_PUT(inbox, cfg->log_pg_sz_m, MOD_STAT_CFG_PG_SZ_M_OFFSET);
err = mlx4_cmd(dev, mailbox->dma, 0, 0, MLX4_CMD_MOD_STAT_CFG,
MLX4_CMD_TIME_CLASS_A);
mlx4_free_cmd_mailbox(dev, mailbox);
return err;
}
int mlx4_QUERY_DEV_CAP(struct mlx4_dev *dev, struct mlx4_dev_cap *dev_cap)
{
struct mlx4_cmd_mailbox *mailbox;

6
drivers/net/mlx4/fw.h
View File

@ -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 */

7
drivers/net/mlx4/main.c
View File

@ -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");