Extend the async_tx api to include routines for offloading raid6 operations to hardware. This is part1, part2 contains raid6 extensions to the iop-adma driver, and part3 contains the changes to make the md/raid6 driver asynchronous. The combined series is available at: git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx.git raid6 The changes since v2 [1] are: 1/ Moved various stripe handling resources to a percpu allocation. Specifically the 'scribble' buffer (for passing and converting address lists) and the raid6 spare page have been moved. 2/ Added 4-disk and 5-disk special cases to the raid6 recovery code as they are special with respect to offload engines. The recovery algorithms use a zero page in the place of the dead data pages. When the async_tx api sees the raid6_empty_zero_page as a source it simply drops it in the asynchronous path. This can result, for example, in a PQ operation with a source count of zero in the case of recovering 2 data disks in a 4-disk array. This does not map to hardware so the recovery code refactors the operation in these special cases. The raid6test module has been updated to hit these cases. I can carry this in async_tx.git/next, or let me know if you would rather pull this into md.git/for-next. Thanks, Dan [1]: http://marc.info/?l=linux-raid&m=124269482227272&w=2 Note, I know that "md/raid6: release spare page at ->stop()" is already upstream, but I have not rebased the tree to preserve the testing that has gone into this series to date. --- Dan Williams (14): async_tx: rename zero_sum to val async_tx: kill ASYNC_TX_DEP_ACK flag async_tx: structify submission arguments, add scribble async_xor: permit callers to pass in a 'dma/page scribble' region md/raid6: release spare page at ->stop() md/raid6: move the spare page to a percpu allocation md/raid5,6: add percpu scribble region for buffer lists async_tx: add sum check flags async_tx: kill needless module_{init|exit} async_tx: remove walk of tx->parent chain in dma_wait_for_async_tx async_tx: add support for asynchronous GF multiplication async_tx: add support for asynchronous RAID6 recovery operations dmatest: add pq support async_tx: raid6 recovery self test Documentation/crypto/async-tx-api.txt | 75 +++- arch/arm/include/asm/hardware/iop3xx-adma.h | 5 arch/arm/mach-iop13xx/include/mach/adma.h | 12 - arch/arm/mach-iop13xx/setup.c | 10 - arch/arm/plat-iop/adma.c | 2 crypto/async_tx/Kconfig | 9 + crypto/async_tx/Makefile | 3 crypto/async_tx/async_memcpy.c | 39 +- crypto/async_tx/async_memset.c | 38 +- crypto/async_tx/async_pq.c | 388 +++++++++++++++++++++++ crypto/async_tx/async_raid6_recov.c | 448 +++++++++++++++++++++++++++ crypto/async_tx/async_tx.c | 83 ++--- crypto/async_tx/async_xor.c | 199 ++++++------ crypto/async_tx/raid6test.c | 241 ++++++++++++++ drivers/dma/Kconfig | 2 drivers/dma/dmaengine.c | 53 +-- drivers/dma/dmatest.c | 26 ++ drivers/dma/iop-adma.c | 40 +- drivers/md/Kconfig | 13 + drivers/md/raid5.c | 452 ++++++++++++++++++--------- drivers/md/raid5.h | 22 + include/linux/async_tx.h | 126 ++++++-- include/linux/dmaengine.h | 116 ++++++- 23 files changed, 1907 insertions(+), 495 deletions(-) create mode 100644 crypto/async_tx/async_pq.c create mode 100644 crypto/async_tx/async_raid6_recov.c create mode 100644 crypto/async_tx/raid6test.c -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
