Date: Wed, 10 May 2017 15:20:55 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-scsi@FreeBSD.org Subject: [Bug 218572] pass(4) driver sometimes does error recovery when CAM_PASS_ERR_RECOVER is not set Message-ID: <bug-218572-5312-YPaDDevoOJ@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-218572-5312@https.bugs.freebsd.org/bugzilla/> References: <bug-218572-5312@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D218572 --- Comment #3 from commit-hook@freebsd.org --- A commit references this bug: Author: ken Date: Wed May 10 15:20:38 UTC 2017 New revision: 318139 URL: https://svnweb.freebsd.org/changeset/base/318139 Log: MFC r317775: Fix error recovery behavior in the pass(4) driver. After FreeBSD SVN revision 236814, the pass(4) driver changed from only doing error recovery when the CAM_PASS_ERR_RECOVER flag was set on a CCB to sometimes doing error recovery if the passed in retry count was non-zero. Error recovery would happen if two conditions were met: 1. The error recovery action was simply a retry. (Which is most cases.) 2. The retry_count is non-zero. (Which happened a lot because of cut-and-pasted code.) This explains a bug I noticed in with camcontrol: # camcontrol tur da34 -v Unit is ready # camcontrol reset da34 Reset of 1:172:0 was successful At this point, there should be a Unit Attention: # camcontrol tur da34 -v Unit is ready No Unit Attention. Try it again: # camcontrol reset da34 Reset of 1:172:0 was successful Now set the retry_count to 0 for the TUR: # camcontrol tur da34 -v -C 0 Unit is not ready (pass42:mps1:0:172:0): TEST UNIT READY. CDB: 00 00 00 00 00 00 (pass42:mps1:0:172:0): CAM status: SCSI Status Error (pass42:mps1:0:172:0): SCSI status: Check Condition (pass42:mps1:0:172:0): SCSI sense: UNIT ATTENTION asc:29,2 (SCSI bus re= set occurred) (pass42:mps1:0:172:0): Field Replaceable Unit: 2 There is the unit attention. camcontrol(8) has a default retry_count of 1, in case someone sets the -E flag without setting -C. The CAM_PASS_ERR_RECOVER behavior was only broken with the CAMIOCOMMAND ioctl, which is the synchronous pass(4) API. It has worked as intended (error recovery is only done when the flag is set) in the asynchronous API (CAMIOQUEUE ioctl). sys/cam/scsi/scsi_pass.c: In passsendccb(), when calling cam_periph_runccb(), only specify the error routine when CAM_PASS_ERR_RECOVER is set. share/man/man4/pass.4: Document that CAM_PASS_ERR_RECOVER is needed to enable error recovery. Reported by: Terry Kennedy <TERRY@glaver.org> PR: kern/218572 Sponsored by: Spectra Logic Changes: _U stable/11/ stable/11/share/man/man4/pass.4 stable/11/sys/cam/scsi/scsi_pass.c --=20 You are receiving this mail because: You are on the CC list for the bug.=
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