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Date: Mon, 23 Dec 2013 11:03:41 -0800
From: "Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To: linux-scsi <linux-scsi@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
target-devel <target-devel@...r.kernel.org>
Cc: Christoph Hellwig <hch@....de>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Jens Axboe <axboe@...nel.dk>,
James Bottomley <James.Bottomley@...senPartnership.com>,
Hannes Reinecke <hare@...e.de>
Subject: scsi-mq WIP updated to v3.13-rc3
Hi Folks,
Just a heads up that scsi-mq alpha code has been updated to v3.13-rc3
using the freshly upstreamed blk-mq logic. The working branch is
available here:
git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending.git scsi-mq
The changelog since the last v3.12-rc3 rev includes:
- Use Scsi_Host to check for can_queue + cmd_per_lun
- Add explicit struct scsi_cmnd memset in scsi_mq_alloc_queue()
- Add support for cmd->prot_sdb pre-allocation
- Add support for cmd->mq_prot_sgl pre-allocation
- Honor request_queue->dma_drain_size in scsi_mq_queue_rq (Jianpeng Ma)
- Drop unnecessary QUEUE_FLAG_NONROT in scsi_mq_alloc_queue (Jianpeng Ma)
- Add bio_integrity setup to blk_mq_make_request
- Pre-allocation of sg tables based on host sg_tablesize (Jianpeng Ma)
- Pre-allocation of protection sg tables based on host sg_tablesize
- Updates for DIF prot_sdb->table.sgl pre-allocation in scsi_init_io
- Acquire q->sysfs_lock for elevator_init (Fengguang)
- Only reference scsi_cmd_to_driver with valid req->rq_disk in
scsi_finish_command()
Also, basic DIF functionality is now working! Here's a quick snippet of
DIF TYPE1 in action using scsi_debug dif=1 dix=1:
[ 34.331249] scsi_debug_init: dif_storep 16777216 bytes @ ffffc90001459000
[ 34.338588] scsi_debug: host protection DIF1 DIX1
[ 34.339490] scsi6 : scsi_debug, version 1.82 [20100324], dev_size_mb=1024, opts=0x0
[ 34.341026] Calling blk_mq_init_queue: scsi_mq_ops: ffffffff8163e760, queue_depth: 64, cmd_size: 304 SCSI cmd_size: 0
[ 34.343031] blk-mq: CPU -> queue map
[ 34.343689] CPU 0 -> Queue 0
[ 34.344322] CPU 1 -> Queue 0
[ 34.344869] CPU 2 -> Queue 0
[ 34.345422] CPU 3 -> Queue 0
[ 34.346005] Performing sc map setup on q: ffff880030180000 hctx: ffff880034e3de00 i: 0
[ 34.348146] scsi_mq_alloc_queue() complete >>>>>>>>>>>>>>>>>>>>>>>>>>>
[ 34.349393] scsi 6:0:0:0: Direct-Access Linux scsi_debug 0004 PQ: 0 ANSI: 5
[ 34.351013] sd 6:0:0:0: Attached scsi generic sg1 type 0
[ 34.352067] sd 6:0:0:0: [sda] Enabling DIF Type 1 protection
[ 34.352075] sd 6:0:0:0: [sda] 2097152 512-byte logical blocks: (1.07 GB/1.00 GiB)
[ 34.360115] sd 6:0:0:0: [sda] Write Protect is off
[ 34.363006] sd 6:0:0:0: [sda] Mode Sense: 73 00 10 08
[ 34.372176] sd 6:0:0:0: [sda] Write cache: enabled, read cache: enabled, supports DPO and FUA
[ 34.416255] sda: unknown partition table
[ 34.419315] sd 6:0:0:0: [sda] Enabling DIX T10-DIF-TYPE1-CRC protection
[ 34.423194] sd 6:0:0:0: [sda] DIF application tag size 2
[ 34.444172] sd 6:0:0:0: [sda] Attached SCSI disk
[ 68.554153] scsi_mq: sc: ffff880030198568 SCSI CDB: : 0x00
[ 68.554164] scsi_mq: scsi_bufflen: 0 rq->cmd_len: 6
[ 68.554178] scsi_mq_end_request: sc: ffff880030198568 sc->tag: 48 error: 0
[ 68.554243] Entering sd_dif_type1_generate >>>>>>>>>>>>>>>
[ 68.554264] TYPE1 Generate: sector: 0 sdt->guard_tag: 0xdfcc sdt->app_tag: 0x0000 sdt->ref_tag: 0
[ 68.554281] TYPE1 Generate: sector: 1 sdt->guard_tag: 0xd693 sdt->app_tag: 0x0000 sdt->ref_tag: 1
[ 68.554297] TYPE1 Generate: sector: 2 sdt->guard_tag: 0xd8ea sdt->app_tag: 0x0000 sdt->ref_tag: 2
[ 68.554309] TYPE1 Generate: sector: 3 sdt->guard_tag: 0x64a3 sdt->app_tag: 0x0000 sdt->ref_tag: 3
[ 68.554322] TYPE1 Generate: sector: 4 sdt->guard_tag: 0xd194 sdt->app_tag: 0x0000 sdt->ref_tag: 4
[ 68.554334] TYPE1 Generate: sector: 5 sdt->guard_tag: 0x0c30 sdt->app_tag: 0x0000 sdt->ref_tag: 5
[ 68.554346] TYPE1 Generate: sector: 6 sdt->guard_tag: 0xcbff sdt->app_tag: 0x0000 sdt->ref_tag: 6
[ 68.554359] TYPE1 Generate: sector: 7 sdt->guard_tag: 0x5c4e sdt->app_tag: 0x0000 sdt->ref_tag: 7
[ 68.554384] scsi_mq: sc: ffff880030198568 SCSI CDB: : 0x2a
[ 68.554389] scsi_mq: scsi_bufflen: 4096 rq->cmd_len: 16
[ 68.554396] Enering prot_verify_write sector: 8 ei_lba: 0
[ 68.554402] WRITE sector: 0 sdt->guard_tag: 0xdfcc sdt->app_tag: 0x0000 sdt->ref_tag: 0
[ 68.554414] WRITE sector: 1 sdt->guard_tag: 0xd693 sdt->app_tag: 0x0000 sdt->ref_tag: 1
[ 68.554427] WRITE sector: 2 sdt->guard_tag: 0xd8ea sdt->app_tag: 0x0000 sdt->ref_tag: 2
[ 68.554439] WRITE sector: 3 sdt->guard_tag: 0x64a3 sdt->app_tag: 0x0000 sdt->ref_tag: 3
[ 68.554451] WRITE sector: 4 sdt->guard_tag: 0xd194 sdt->app_tag: 0x0000 sdt->ref_tag: 4
[ 68.554463] WRITE sector: 5 sdt->guard_tag: 0x0c30 sdt->app_tag: 0x0000 sdt->ref_tag: 5
[ 68.554475] WRITE sector: 6 sdt->guard_tag: 0xcbff sdt->app_tag: 0x0000 sdt->ref_tag: 6
[ 68.554488] WRITE sector: 7 sdt->guard_tag: 0x5c4e sdt->app_tag: 0x0000 sdt->ref_tag: 7
<SNIP>
[ 68.572734] scsi_mq: sc: ffff880030198568 SCSI CDB: : 0x28
[ 68.572741] scsi_mq: scsi_bufflen: 4096 rq->cmd_len: 16
[ 68.572750] Entering prot_verify_read: sector: 8 ei_lba: 0
[ 68.572758] READ sector: 0 sdt->guard_tag: 0xdfcc sdt->app_tag: 0x0000 sdt->ref_tag: 0
[ 68.572774] READ sector: 1 sdt->guard_tag: 0xd693 sdt->app_tag: 0x0000 sdt->ref_tag: 1
[ 68.572786] READ sector: 2 sdt->guard_tag: 0xd8ea sdt->app_tag: 0x0000 sdt->ref_tag: 2
[ 68.572799] READ sector: 3 sdt->guard_tag: 0x64a3 sdt->app_tag: 0x0000 sdt->ref_tag: 3
[ 68.572811] READ sector: 4 sdt->guard_tag: 0xd194 sdt->app_tag: 0x0000 sdt->ref_tag: 4
[ 68.572823] READ sector: 5 sdt->guard_tag: 0x0c30 sdt->app_tag: 0x0000 sdt->ref_tag: 5
[ 68.572835] READ sector: 6 sdt->guard_tag: 0xcbff sdt->app_tag: 0x0000 sdt->ref_tag: 6
[ 68.572847] READ sector: 7 sdt->guard_tag: 0x5c4e sdt->app_tag: 0x0000 sdt->ref_tag: 7
[ 68.576195] scsi_mq_end_request: sc: ffff880030198568 sc->tag: 48 error: 0
[ 68.576383] TYPE1 Verify sector: 0 sdt->guard_tag: 0xdfcc sdt->app_tag: 0x0000 sdt->ref_tag: 0
[ 68.576397] TYPE1 Verify sector: 1 sdt->guard_tag: 0xd693 sdt->app_tag: 0x0000 sdt->ref_tag: 1
[ 68.576409] TYPE1 Verify sector: 2 sdt->guard_tag: 0xd8ea sdt->app_tag: 0x0000 sdt->ref_tag: 2
[ 68.576422] TYPE1 Verify sector: 3 sdt->guard_tag: 0x64a3 sdt->app_tag: 0x0000 sdt->ref_tag: 3
[ 68.576434] TYPE1 Verify sector: 4 sdt->guard_tag: 0xd194 sdt->app_tag: 0x0000 sdt->ref_tag: 4
[ 68.576446] TYPE1 Verify sector: 5 sdt->guard_tag: 0x0c30 sdt->app_tag: 0x0000 sdt->ref_tag: 5
[ 68.576458] TYPE1 Verify sector: 6 sdt->guard_tag: 0xcbff sdt->app_tag: 0x0000 sdt->ref_tag: 6
[ 68.576490] TYPE1 Verify sector: 7 sdt->guard_tag: 0x5c4e sdt->app_tag: 0x0000 sdt->ref_tag: 7
So now with some of the lower-hanging bugs out of the way, I'll next be
focusing identifying outstanding TODO items over the holidays for those
who are interested in contributing in 2014.
Enjoy.
--nab
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