James Smart wrote:
> Implement support for wire-only DIF devices
>
> This patch adds the ability to support auto-enablement of wire-only DIF
> (DIF is generated on TX to target, stripped on RX; OS unaware DIF in use)
> for a select set of devices. Currently, there is only 1 device vendor
> supported: 3PARdata. When the feature is enabled, Inquiry commands are
> trapped, the vendor matched, and DIF enablement checked. In 3Par's case,
> there's a vendor specific check to see if the LUN supports DIF.
> If supported, DIF will be enabled on a per-lun basis. The driver will
> trap READS/WRITEs from the OS, check for LUN DIF enablement, and if set,
> turns on write-only DIF.
>
> Signed-off-by: Dick Kennedy <[email protected]>
> Signed-off-by: James Smart <[email protected]>
> ---
> drivers/scsi/lpfc/lpfc.h | 41 ++++
> drivers/scsi/lpfc/lpfc_attr.c | 65 ++++++-
> drivers/scsi/lpfc/lpfc_crtn.h | 3 +-
> drivers/scsi/lpfc/lpfc_hbadisc.c | 3 +
> drivers/scsi/lpfc/lpfc_init.c | 24 ++-
> drivers/scsi/lpfc/lpfc_mbox.c | 4 +-
> drivers/scsi/lpfc/lpfc_scsi.c | 410
> ++++++++++++++++++++++++++++++++++++---
> drivers/scsi/lpfc/lpfc_scsi.h | 7 +-
> drivers/scsi/lpfc/lpfc_sli.c | 36 ++--
> 9 files changed, 532 insertions(+), 61 deletions(-)
<snip>
> diff --git a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c
> index faf0e8c..891e2d1 100644
> --- a/drivers/scsi/lpfc/lpfc_attr.c
> +++ b/drivers/scsi/lpfc/lpfc_attr.c
> @@ -135,16 +135,29 @@ lpfc_bg_info_show(struct device *dev, struct
> device_attribute *attr,
> struct Scsi_Host *shost = class_to_shost(dev);
> struct lpfc_vport *vport = (struct lpfc_vport *) shost->hostdata;
> struct lpfc_hba *phba = vport->phba;
> + int len = 0;
>
> - if (phba->cfg_enable_bg)
> + if (phba->cfg_enable_bg) {
> if (phba->sli3_options & LPFC_SLI3_BG_ENABLED)
> - return snprintf(buf, PAGE_SIZE, "BlockGuard Enabled\n");
> + len += snprintf(buf, PAGE_SIZE,
> + "BlockGuard Enabled\n");
> else
> - return snprintf(buf, PAGE_SIZE,
> + len += snprintf(buf, PAGE_SIZE,
> "BlockGuard Not Supported\n");
> - else
> - return snprintf(buf, PAGE_SIZE,
> + } else {
> + len += snprintf(buf, PAGE_SIZE,
> "BlockGuard Disabled\n");
> + }
> +
> + if (phba->cfg_external_dif) {
> + if (phba->sli3_options & LPFC_SLI3_BG_ENABLED)
> + len += snprintf(buf + len, PAGE_SIZE,
> + "External DIF Enabled\n");
> + else
> + len += snprintf(buf + len, PAGE_SIZE,
> + "External DIF Not Supported\n");
> + }
> + return len;
> }
>
> static ssize_t
> @@ -4681,6 +4694,30 @@ LPFC_ATTR_R(EnableXLane, 0, 0, 1, "Enable Express Lane
> Feature.");
> */
> LPFC_ATTR_RW(XLanePriority, 0, 0x0, 0x7f, "CS_CTL for Express Lane
> Feature.");
>
> +
> +/*
> + * For T10 DIF / protection data support, the driver supports 4 modes
> + * of operation.
> + *
> + * Mode 1: (lpfc_enable_bg=1 lpfc_external_dif=1)
> + * All normal T10 DIF devices are supported.
> + * External DIF devices are supported.
> + *
> + * Mode 2: (lpfc_enable_bg=0 lpfc_external_dif=1)
> + * If you don't want to have the extra overhead of the upper SCSI Layer
> + * supporting T10-DIF, but you still want to support External DIF devices.
> + * Normal T10 DIF devices are NOT supported.
> + * External DIF devices are supported.
> + *
> + * Mode 3: (lpfc_enable_bg=1 lpfc_external_dif=0)
> + * All normal T10 DIF devices are supported.
> + * External DIF devices are NOT supported.
> + *
> + * Mode 4: (lpfc_enable_bg=0 lpfc_external_dif=1)
> + * No normal T10-DIF and no external DIF devices supported,
> + * This would be the driver default values for these module parameters.
> + */
Not lpfc_external_dif=0?
> /*
> # lpfc_enable_bg: Enable BlockGuard (Emulex's Implementation of T10-DIF)
> # 0 = BlockGuard disabled (default)
> @@ -4690,6 +4727,15 @@ LPFC_ATTR_RW(XLanePriority, 0, 0x0, 0x7f, "CS_CTL for
> Express Lane Feature.");
> LPFC_ATTR_R(enable_bg, 0, 0, 1, "Enable BlockGuard Support");
>
> /*
> +# lpfc_external_dif: Enable External DIF support on select devices
> +# 0 = External DIF disabled (default)
> +# 1 = External DIF enabled
> +# Value range is [0,1]. Default value is 0.
> +*/
> +LPFC_ATTR_R(external_dif, 0, 0, 1,
> + "External T10-DIF Support, on select devices");
> +
> +/*
> # lpfc_fcp_look_ahead: Look ahead for completions in FCP start routine
> # 0 = disabled (default)
> # 1 = enabled
Sebastian
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