diff options
| author |   Benjamin Block <bblock@linux.ibm.com> | 2019-10-25 18:12:44 +0200 |
|---|---|---|
| committer |   Martin K. Petersen <martin.petersen@oracle.com> | 2019-10-28 22:16:14 -0400 |
| commit | 7e418833e68948cb9ed15262889173b7db2960cb (patch) | |
| tree | 7a61e483bb7f76d6564a9fbfe6e18d6707af8133 /drivers/s390/scsi/Makefile | |
| parent | scsi: zfcp: signal incomplete or error for sync exchange config/port data (diff) | |
| download | linux-dev-7e418833e68948cb9ed15262889173b7db2960cb.tar.xz linux-dev-7e418833e68948cb9ed15262889173b7db2960cb.zip | |
scsi: zfcp: diagnostics buffer caching and use for exchange port data
The FCP channel exposes two central interfaces to receive information about
the local FCP-Adapter/-Port: Exchange Port and Exchange Config Data. Using
these commands can negatively impact the adapter if we allow them to be
sent at a very high rate.
The later parts of this patchset will introduce new user-interfaces to
receive more diagnostics from the adapter. To prevent any negative impact
from using those, this patch adds a simple caching-mechanism that will
prevent a malicious/faulty userspace-application from generating an
abnormal high amount of Exchange Port/Config Data traffic.
Relevant diagnostic data that is received via Exchange Config/Port Data is
cached in buffers associated with the corresponding adapter-struct. Each
buffer is associated with a timestamp that signals how old the data is,
and, added via a following patch in this series, lets userspace-interfaces
determine when the data is too old and needs to be updated.
Buffer-updates are made during the normal response path of the
corresponding command. With this patch only the output of the Exchange Port
Data command is captured.
Link: https://lore.kernel.org/r/054ca020ce0a53dc0d9176428bea373898944e6a.1572018130.git.bblock@linux.ibm.com
Reviewed-by: Steffen Maier <maier@linux.ibm.com>
Signed-off-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/s390/scsi/Makefile')
| -rw-r--r-- | drivers/s390/scsi/Makefile | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/s390/scsi/Makefile b/drivers/s390/scsi/Makefile index 9dda431ec8f3..352056eb0dd1 100644 --- a/drivers/s390/scsi/Makefile +++ b/drivers/s390/scsi/Makefile @@ -5,6 +5,6 @@ zfcp-objs := zfcp_aux.o zfcp_ccw.o zfcp_dbf.o zfcp_erp.o \ zfcp_fc.o zfcp_fsf.o zfcp_qdio.o zfcp_scsi.o zfcp_sysfs.o \ - zfcp_unit.o + zfcp_unit.o zfcp_diag.o obj-$(CONFIG_ZFCP) += zfcp.o |