4 Commits

Author	SHA1	Message	Date
Anup Patel	b5dceda1f7	lib/raid6: Add log-of-2 table for RAID6 HW requiring disk position ... The raid6_gfexp table represents {2}^n values for 0 <= n < 256. The Linux async_tx framework pass values from raid6_gfexp as coefficients for each source to prep_dma_pq() callback of DMA channel with PQ capability. This creates problem for RAID6 offload engines (such as Broadcom SBA) which take disk position (i.e. log of {2}) instead of multiplicative cofficients from raid6_gfexp table. This patch adds raid6_gflog table having log-of-2 value for any given x such that 0 <= x < 256. For any given disk coefficient x, the corresponding disk position is given by raid6_gflog[x]. The RAID6 offload engine driver can use this newly added raid6_gflog table to get disk position from multiplicative coefficient. Signed-off-by: Anup Patel <anup.patel@broadcom.com> Reviewed-by: Scott Branden <scott.branden@broadcom.com> Reviewed-by: Ray Jui <ray.jui@broadcom.com> Acked-by: Shaohua Li <shli@fb.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>	2017-05-16 10:01:57 +05:30
Jim Kukunas	048a8b8c89	lib/raid6: Add SSSE3 optimized recovery functions ... Add SSSE3 optimized recovery functions, as well as a system for selecting the most appropriate recovery functions to use. Originally-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Jim Kukunas <james.t.kukunas@linux.intel.com> Signed-off-by: NeilBrown <neilb@suse.de>	2012-05-22 13:54:18 +10:00
Paul Gortmaker	daaa5f7cbe	md: Add in export.h for files using EXPORT_SYMBOL ... These files were getting the defines for EXPORT_SYMBOL because device.h was including module.h. But we are going to put an end to that. So add the proper export.h include now. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>	2011-10-31 19:31:19 -04:00
David Woodhouse	f5e70d0fe3	md: Factor out RAID6 algorithms into lib/ ... We'll want to use these in btrfs too. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>	2009-10-29 14:38:47 +00:00