diff options
| author | Vasanthy Kolluri <vkolluri@cisco.com> | 2011-06-17 09:56:48 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-07-01 05:43:38 +0200 |
| commit | ea7ea65a3b37bf207d5c352ac6254506b3dc3901 (patch) | |
| tree | 5eed17f071404155e7a76f8f3415bf031a4d656a /drivers/net/enic/vnic_devcmd.h | |
| parent | virtio-net: per cpu 64 bit stats (v2) (diff) | |
| download | linux-ea7ea65a3b37bf207d5c352ac6254506b3dc3901.tar.xz linux-ea7ea65a3b37bf207d5c352ac6254506b3dc3901.zip | |
enic: Add support to configure hardware interrupt coalesce timers in a platform independent way
enic driver and the underlying hardware use different units for representing the interrupt coalesce timer.
Driver converts the interrupt coalesce timer in usec to hardware cycles while setting the relevant hardware
registers. The conversion factor can be different for each of the adapter hardware types. So it is dynamically
learnt from the adapter firmware using the devcmd CMD_INTR_COAL_CONVERT. This allows the driver to configure
the hardware interrupt coalesce timers in a platform independent way.
Signed-off-by: Danny Guo <dannguo@cisco.com>
Signed-off-by: Vasanthy Kolluri <vkolluri@cisco.com>
Signed-off-by: Roopa Prabhu <roprabhu@cisco.com>
Signed-off-by: David Wang <dwang2@cisco.com>
Signed-off-by: David S. Miller <davem@conan.davemloft.net>
Diffstat (limited to 'drivers/net/enic/vnic_devcmd.h')
| -rw-r--r-- | drivers/net/enic/vnic_devcmd.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/net/enic/vnic_devcmd.h b/drivers/net/enic/vnic_devcmd.h index c5569bfb47ac..8025e8808d61 100644 --- a/drivers/net/enic/vnic_devcmd.h +++ b/drivers/net/enic/vnic_devcmd.h @@ -318,6 +318,25 @@ enum vnic_devcmd_cmd { * ERR_EINPROGRESS - command in a0 is still in progress */ CMD_STATUS = _CMDC(_CMD_DIR_RW, _CMD_VTYPE_ALL, 49), + + /* + * Returns interrupt coalescing timer conversion factors. + * After calling this devcmd, ENIC driver can convert + * interrupt coalescing timer in usec into CPU cycles as follows: + * + * intr_timer_cycles = intr_timer_usec * multiplier / divisor + * + * Interrupt coalescing timer in usecs can be obtained from + * CPU cycles as follows: + * + * intr_timer_usec = intr_timer_cycles * divisor / multiplier + * + * in: none + * out: (u32)a0 = multiplier + * (u32)a1 = divisor + * (u32)a2 = maximum timer value in usec + */ + CMD_INTR_COAL_CONVERT = _CMDC(_CMD_DIR_READ, _CMD_VTYPE_ALL, 50), }; /* CMD_ENABLE2 flags */ |