diff options
| author |   James Smart <jsmart2021@gmail.com> | 2017-08-01 15:12:40 -0700 |
|---|---|---|
| committer |   Christoph Hellwig <hch@lst.de> | 2017-08-10 11:19:05 +0200 |
| commit | 507384209371fc25cab203b95e7bdf50e58b47d5 (patch) | |
| tree | d7b2edc74a7cb6bde44454365610f4175d534981 /drivers/scsi/lpfc/lpfc_attr.c | |
| parent | nvmet_fc: add defer_req callback for deferment of cmd buffer return (diff) | |
| download | linux-dev-507384209371fc25cab203b95e7bdf50e58b47d5.tar.xz linux-dev-507384209371fc25cab203b95e7bdf50e58b47d5.zip | |
lpfc: support nvmet_fc defer_rcv callback
Currently, calls to nvmet_fc_rcv_fcp_req() always copied the
FC-NVME cmd iu to a temporary buffer before returning, allowing
the driver to immediately repost the buffer to the hardware.
To address timing conditions on queue element structures vs async
command reception, the nvmet_fc transport occasionally may need to
hold on to the command iu buffer for a short period. In these cases,
the nvmet_fc_rcv_fcp_req() will return a special return code
(-EOVERFLOW). In these cases, the LLDD must delay until the new
defer_rcv lldd callback is called before recycling the buffer back
to the hw.
This patch adds support for the new nvmet_fc transport defer_rcv
callback and recognition of the new error code when passing commands
to the transport.
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/scsi/lpfc/lpfc_attr.c')
| -rw-r--r-- | drivers/scsi/lpfc/lpfc_attr.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c index 4ed48ed38e79..7ee1a94c0b33 100644 --- a/drivers/scsi/lpfc/lpfc_attr.c +++ b/drivers/scsi/lpfc/lpfc_attr.c @@ -205,8 +205,10 @@ lpfc_nvme_info_show(struct device *dev, struct device_attribute *attr, atomic_read(&tgtp->xmt_ls_rsp_error)); len += snprintf(buf+len, PAGE_SIZE-len, - "FCP: Rcv %08x Release %08x Drop %08x\n", + "FCP: Rcv %08x Defer %08x Release %08x " + "Drop %08x\n", atomic_read(&tgtp->rcv_fcp_cmd_in), + atomic_read(&tgtp->rcv_fcp_cmd_defer), atomic_read(&tgtp->xmt_fcp_release), atomic_read(&tgtp->rcv_fcp_cmd_drop)); |