On 05/10/2017 07:54 AM, wenxiong@xxxxxxxxxxxxxxxxxx wrote: > From: Wen Xiong <wenxiong@xxxxxxxxxxxxxxxxxx> > > When formatting NVMe to 512B/4K + T10 DIf/DIX, dd with split op returns > "Input/output error". Looks block layer split the bio after calling > bio_integrity_prep(bio). This patch fixes the issue. > > Below is how we debug this issue: > (1)format nvme to 4K block # size with type 2 DIF > (2)dd with block size bigger than 1024k. > oflag=direct > dd: error writing '/dev/nvme0n1': Input/output error > > We added some debug code in nvme device driver. It showed us the first > op and the second op have the same bi and pi address. This is not > correct. > > 1st op: nvme0n1 Op:Wr slba 0x505 length 0x100, PI ctrl=0x1400, > dsmgmt=0x0, AT=0x0 & RT=0x505 > Guard 0x00b1, AT 0x0000, RT physical 0x00000505 RT virtual 0x00002828 > > 2nd op: nvme0n1 Op:Wr slba 0x605 length 0x1, PI ctrl=0x1400, dsmgmt=0x0, > AT=0x0 & RT=0x605 ==> This op fails and subsequent 5 retires.. > Guard 0x00b1, AT 0x0000, RT physical 0x00000605 RT virtual 0x00002828 > > With the fix, It showed us both of the first op and the second op have > correct bi and pi address. > > 1st op: nvme2n1 Op:Wr slba 0x505 length 0x100, PI ctrl=0x1400, > dsmgmt=0x0, AT=0x0 & RT=0x505 > Guard 0x5ccb, AT 0x0000, RT physical 0x00000505 RT virtual > 0x00002828 > 2nd op: nvme2n1 Op:Wr slba 0x605 length 0x1, PI ctrl=0x1400, dsmgmt=0x0, > AT=0x0 & RT=0x605 > Guard 0xab4c, AT 0x0000, RT physical 0x00000605 RT virtual > 0x00003028 Good catch, your fix looks correct to me. -- Jens Axboe
