(Adding target-devel + Qlogic target folks) On Tue, 2016-03-29 at 22:05 -0700, Bart Van Assche wrote: > On 03/29/16 07:42, Laurence Oberman wrote: > > I have been using this jammer functionality to continue testing the SCSI F/C drivers and recovery for over a year now. > > Any chance you would agree to ack this so I can get it in now. > > I last posted to the list last March and it was not picked up. > > > > I did look into moving this to upper layers but I find I use it primarily for fiber channel target testing. > > Attempting to add this functionality to upper layers led to complexities and this is very solid. > > > > This Patch diff against 4.5 > > > > I use target LIO for all my storage array test targets and customer problem resolution here at Red Hat. > > This patch resulted from a requirement to mimic behavior of an expensive hardware jammer for a customer. > > I have used this for some time with good success to simulate and reproduce latency and slow drain fabric issues and > > for testing and validating error handling behavior > > in the Emulex, Qlogic and other F/C drivers. > > > > Works by checking new parameter jam_host if its >= 0 and matches vha->host_no , jamming is enabled when jam_host >=0 > > If parameter set to -1 (default) no jamming is enabled. > > Hello Laurence, > > Nic Bellinger is the maintainer of LIO so my recommendation is to ask > Nic first about his opinion (I have CC'd Nic). I'm not sure what Nic > thinks about this but in my opinion such functionality belongs in the > target core instead of in a target driver. But please wait until Nic has > provided his opinion before spending more time on this. The mailing list > for SCSI target patches is target-devel@xxxxxxxxxxxxxxx. > So really it's Himanshu's + Quinn's call if they would like to include something like this in mainline. If so, then I'd prefer to do it with a per tcm_qla2xxx_tpg endpoint attribute instead a new module parameter, and add a new kernel config option (CONFIG_TCM_QLA2XXX_DEBUG) to disable (by default) so end users don't inadvertently play with it via targetcli + friends. -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
