diff options
| author | Eli Cohen <eli@mellanox.co.il> | 2006-02-27 01:36:06 +0300 |
|---|---|---|
| committer | Roland Dreier <rolandd@cisco.com> | 2006-03-20 21:08:17 +0300 |
| commit | 14abdffcc0a0ca9c5bb3274648d073e09a6fd2ba (patch) | |
| tree | fe934450412ed70f627e9d98bb881b03c7b31222 /drivers/infiniband/hw/mthca/mthca_dev.h | |
| parent | ea88fd16d6e85f4bc71b6053180b64f04be1ff14 (diff) | |
| download | linux-14abdffcc0a0ca9c5bb3274648d073e09a6fd2ba.tar.xz | |
IB/mthca: Write FW commands through doorbell page
This patch is checks whether the HCA supports posting FW commands
through a doorbell page (user access region 0, or "UAR0"). If this is
supported, the driver maps UAR0 and uses it for FW commands. This can
be controlled by the value of a writable module parameter
fw_cmd_doorbell. When the parameter is 0, the commands are posted
through HCR using the old method; otherwise if HCA is capable commands
go through UAR0.
This use of UAR0 to post commands eliminates the need for polling the
"go" bit prior to posting a new command. Since reading from a PCI
device is much more expensive then issuing a posted write, it is
expected that issuing FW commands this way will provide better CPU
utilization.
Signed-off-by: Eli Cohen <eli@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband/hw/mthca/mthca_dev.h')
| -rw-r--r-- | drivers/infiniband/hw/mthca/mthca_dev.h | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/infiniband/hw/mthca/mthca_dev.h b/drivers/infiniband/hw/mthca/mthca_dev.h index 7f0dc221fa47..b2aea80a683f 100644 --- a/drivers/infiniband/hw/mthca/mthca_dev.h +++ b/drivers/infiniband/hw/mthca/mthca_dev.h @@ -110,9 +110,17 @@ enum { MTHCA_OPCODE_INVALID = 0xff }; +enum { + MTHCA_CMD_USE_EVENTS = 1 << 0, + MTHCA_CMD_POST_DOORBELLS = 1 << 1 +}; + +enum { + MTHCA_CMD_NUM_DBELL_DWORDS = 8 +}; + struct mthca_cmd { struct pci_pool *pool; - int use_events; struct mutex hcr_mutex; struct semaphore poll_sem; struct semaphore event_sem; @@ -121,6 +129,9 @@ struct mthca_cmd { int free_head; struct mthca_cmd_context *context; u16 token_mask; + u32 flags; + void __iomem *dbell_map; + u16 dbell_offsets[MTHCA_CMD_NUM_DBELL_DWORDS]; }; struct mthca_limits { |