diff options
| author | Dan Williams <dan.j.williams@intel.com> | 2009-09-08 12:01:38 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2009-09-08 17:30:24 -0700 |
| commit | ad643f54c8514998333bc6c7b201fda2267496be (patch) | |
| tree | c92bbecd74912ada08dfa94662b52e63d4c5df46 /drivers/dma/ioat/hw.h | |
| parent | 345d852391cf3fdc73f23a9ca522c6e7b5eb5a52 (diff) | |
ioat1: trim ioat_dma_desc_sw
Save 4 bytes per software descriptor by transmitting tx_cnt in an unused
portion of the hardware descriptor.
Signed-off-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dma/ioat/hw.h')
| -rw-r--r-- | drivers/dma/ioat/hw.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/dma/ioat/hw.h b/drivers/dma/ioat/hw.h index e13f3ed4776..7481fb13ce0 100644 --- a/drivers/dma/ioat/hw.h +++ b/drivers/dma/ioat/hw.h @@ -63,7 +63,11 @@ struct ioat_dma_descriptor { uint64_t next; uint64_t rsv1; uint64_t rsv2; - uint64_t user1; + /* store some driver data in an unused portion of the descriptor */ + union { + uint64_t user1; + uint64_t tx_cnt; + }; uint64_t user2; }; #endif |