Steffen Maier 70369f8e15 zfcp: fix ELS/GS request&response length for hardware data router ... In the hardware data router case, introduced with kernel 3.2 commit 86a9668a8d ("[SCSI] zfcp: support for hardware data router") the ELS/GS request&response length needs to be initialized as in the chained SBAL case. Otherwise, the FCP channel rejects ELS requests with FSF_REQUEST_SIZE_TOO_LARGE. Such ELS requests can be issued by user space through BSG / HBA API, or zfcp itself uses ADISC ELS for remote port link test on RSCN. The latter can cause a short path outage due to unnecessary remote target port recovery because the always failing ADISC cannot detect extremely short path interruptions beyond the local FCP channel. Below example is decoded with zfcpdbf from s390-tools: Timestamp : ... Area : SAN Subarea : 00 Level : 1 Exception : - CPU id : .. Caller : zfcp_dbf_san_req+0408 Record id : 1 Tag : fssels1 Request id : 0x<reqid> Destination ID : 0x00<target d_id> Payload info : 52000000 00000000 <our wwpn > [ADISC] <our wwnn > 00<s_id> 00000000 00000000 00000000 00000000 00000000 Timestamp : ... Area : HBA Subarea : 00 Level : 1 Exception : - CPU id : .. Caller : zfcp_dbf_hba_fsf_res+0740 Record id : 1 Tag : fs_ferr Request id : 0x<reqid> Request status : 0x00000010 FSF cmnd : 0x0000000b [FSF_QTCB_SEND_ELS] FSF sequence no: 0x... FSF issued : ... FSF stat : 0x00000061 [FSF_REQUEST_SIZE_TOO_LARGE] FSF stat qual : 00000000 00000000 00000000 00000000 Prot stat : 0x00000100 Prot stat qual : 00000000 00000000 00000000 00000000 Signed-off-by: Steffen Maier <maier@linux.vnet.ibm.com> Fixes: 86a9668a8d ("[SCSI] zfcp: support for hardware data router") Cc: <stable@vger.kernel.org> # 3.2+ Reviewed-by: Benjamin Block <bblock@linux.vnet.ibm.com> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>		2016-08-12 16:17:12 -04:00
..
block	libnvdimm for 4.8	2016-07-28 17:38:16 -07:00
char	- ARM: GICv3 ITS emulation and various fixes. Removal of the old	2016-08-02 16:11:27 -04:00
cio	s390/cio: fix premature wakeup during chp configure	2016-07-31 05:27:57 -04:00
crypto	s390/zcrypt: fix possible memory leak in ap_module_init()	2016-07-31 06:10:41 -04:00
net	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2016-07-06 10:35:22 -07:00
scsi	zfcp: fix ELS/GS request&response length for hardware data router	2016-08-12 16:17:12 -04:00
virtio	virtio/s390: size of SET_IND payload	2016-03-02 18:08:59 +02:00
Makefile	virtio/s390: rename drivers/s390/kvm -> drivers/s390/virtio	2015-07-07 14:27:06 +03:00