From 9e06688e7d60149cc9ef78ff29515c20186bb418 Mon Sep 17 00:00:00 2001 From: "Martin K. Petersen" Date: Fri, 19 Sep 2008 18:47:21 -0400 Subject: [PATCH] [SCSI] sd: Correctly handle all combinations of DIF and DIX The old detection code couldn't handle all possible combinations of DIX and DIF. This version does, giving priority to DIX if the controller is capable. Signed-off-by: Martin K. Petersen Signed-off-by: James Bottomley --- drivers/scsi/sd.c | 3 ++- drivers/scsi/sd.h | 2 +- drivers/scsi/sd_dif.c | 37 ++++++++++++++++++++----------------- 3 files changed, 23 insertions(+), 19 deletions(-) diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index a494a2ec67d7..7c4d2e68df1c 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -575,7 +575,8 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq) /* If DIF or DIX is enabled, tell HBA how to handle request */ if (host_dif || scsi_prot_sg_count(SCpnt)) - sd_dif_op(SCpnt, sdkp->protection_type, scsi_prot_sg_count(SCpnt)); + sd_dif_op(SCpnt, host_dif, scsi_prot_sg_count(SCpnt), + sdkp->protection_type); /* * We shouldn't disconnect in the middle of a sector, so with a dumb diff --git a/drivers/scsi/sd.h b/drivers/scsi/sd.h index 95b9f06534d5..a92b991d98ab 100644 --- a/drivers/scsi/sd.h +++ b/drivers/scsi/sd.h @@ -99,7 +99,7 @@ struct sd_dif_tuple { #if defined(CONFIG_BLK_DEV_INTEGRITY) -extern void sd_dif_op(struct scsi_cmnd *, unsigned int, unsigned int); +extern void sd_dif_op(struct scsi_cmnd *, unsigned int, unsigned int, unsigned int); extern void sd_dif_config_host(struct scsi_disk *); extern int sd_dif_prepare(struct request *rq, sector_t, unsigned int); extern void sd_dif_complete(struct scsi_cmnd *, unsigned int); diff --git a/drivers/scsi/sd_dif.c b/drivers/scsi/sd_dif.c index 943fde7e7ffb..194c7706083b 100644 --- a/drivers/scsi/sd_dif.c +++ b/drivers/scsi/sd_dif.c @@ -311,24 +311,26 @@ void sd_dif_config_host(struct scsi_disk *sdkp) struct scsi_device *sdp = sdkp->device; struct gendisk *disk = sdkp->disk; u8 type = sdkp->protection_type; + int dif, dix; - /* If this HBA doesn't support DIX, resort to normal I/O or DIF */ - if (scsi_host_dix_capable(sdp->host, type) == 0) { + dif = scsi_host_dif_capable(sdp->host, type); + dix = scsi_host_dix_capable(sdp->host, type); - if (type == SD_DIF_TYPE0_PROTECTION) - return; - - if (scsi_host_dif_capable(sdp->host, type) == 0) { - sd_printk(KERN_INFO, sdkp, "Type %d protection " \ - "unsupported by HBA. Disabling DIF.\n", type); - return; - } + if (!dix && scsi_host_dix_capable(sdp->host, 0)) { + dif = 0; dix = 1; + } - sd_printk(KERN_INFO, sdkp, "Enabling DIF Type %d protection\n", - type); + if (type) { + if (dif) + sd_printk(KERN_INFO, sdkp, + "Enabling DIF Type %d protection\n", type); + else + sd_printk(KERN_INFO, sdkp, + "Disabling DIF Type %d protection\n", type); + } + if (!dix) return; - } /* Enable DMA of protection information */ if (scsi_host_get_guard(sdkp->device->host) & SHOST_DIX_GUARD_IP) @@ -343,10 +345,10 @@ void sd_dif_config_host(struct scsi_disk *sdkp) blk_integrity_register(disk, &dif_type1_integrity_crc); sd_printk(KERN_INFO, sdkp, - "Enabling %s integrity protection\n", disk->integrity->name); + "Enabling DIX %s protection\n", disk->integrity->name); /* Signal to block layer that we support sector tagging */ - if (type && sdkp->ATO) { + if (dif && type && sdkp->ATO) { if (type == SD_DIF_TYPE3_PROTECTION) disk->integrity->tag_size = sizeof(u16) + sizeof(u32); else @@ -360,7 +362,7 @@ void sd_dif_config_host(struct scsi_disk *sdkp) /* * DIF DMA operation magic decoder ring. */ -void sd_dif_op(struct scsi_cmnd *scmd, unsigned int dif, unsigned int dix) +void sd_dif_op(struct scsi_cmnd *scmd, unsigned int dif, unsigned int dix, unsigned int type) { int csum_convert, prot_op; @@ -405,7 +407,8 @@ void sd_dif_op(struct scsi_cmnd *scmd, unsigned int dif, unsigned int dix) } scsi_set_prot_op(scmd, prot_op); - scsi_set_prot_type(scmd, dif); + if (dif) + scsi_set_prot_type(scmd, type); } /* -- 2.39.5