LUN probing problem with 6.0-BETA4 and seagate drive

[Scott Long]

Andrew Heybey wrote:

> I just upgraded a box from 5.3 to 6.0-BETA4.
> 
> I have this drive on the system:
> 
> da5 at ahc1 bus 0 target 0 lun 0
> da5: <SEAGATE SX336704LC BC0A> Fixed Direct Access SCSI-3 device 
> da5: 40.000MB/s transfers (20.000MHz, offset 63, 16bit)
> da5: 34732MB (71132960 512 byte sectors: 255H 63S/T 4427C)
> 
> I think that the "SX" means it has EMC firmware (not sure of the drives
> history, it is an ebay purchase).
> 
> It is attached to this HBA:
> 
> ahc1: <Adaptec aic7899 Ultra160 SCSI adapter> port 0x6000-0x60ff mem 0xfc001000-0xfc001fff irq 17 at device 4.1 on pci1
> 
> With 5.3 it worked fine.  With 6.0-BETA4, I get 200+ iterations of this message at boot time:
> 
> Sep 13 14:26:45 spaten kernel: SEQADDR == 0x16c
> Sep 13 14:26:45 spaten kernel: ahc1:A:0: Message reject for 80 -- ignored
> Sep 13 14:26:45 spaten kernel: (probe0:ahc1:0:0:56): Unexpected busfree in Message-in phase
> Sep 13 14:26:45 spaten kernel: SEQADDR == 0x16c
> Sep 13 14:26:45 spaten kernel: ahc1:A:0: Message reject for 80 -- ignored
> Sep 13 14:26:45 spaten kernel: (probe0:ahc1:0:0:57): Unexpected busfree in Message-in phase
> 
> I worked around the problem by applying the following patch to sys/cam/cam_xpt.c:
> 
> Index: cam_xpt.c
> ===================================================================
> RCS file: /usr/local/repos/fbsdcvs/src/sys/cam/cam_xpt.c,v
> retrieving revision 1.155
> diff -u -u -r1.155 cam_xpt.c
> --- cam_xpt.c   1 Jul 2005 15:21:29 -0000       1.155
> +++ cam_xpt.c   15 Sep 2005 12:47:06 -0000
> @@ -477,6 +477,15 @@
>         },
>         {
>                 /*
> +                * This Seagate drive with EMC firmware causes
> +                * "Unexpected busfree" and "message reject"
> +                * messages at boot time when LUNs are probed.
> +                */
> +               { T_DIRECT, SIP_MEDIA_FIXED, "SEAGATE", "SX336704*", "*" },
> +               CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
> +       },
> +       {
> +               /*
>                  * The Hitachi CJ series with J8A8 firmware apparantly has
>                  * problems with tagged commands.
>                  * PR: 23536
> 
> Is this the correct thing to do, or is there a bug in the ahc driver?  I am
> curious why I get "Unexpected busfree" messages with 6.0-BETA4 and not with
> 5.3.  If the quirk is the right thing to do, it should probably be "SX*"...
> 
> andrew

This problem is likely due to the more agressive lun scanning that was 
added a few months ago.  It is currently being reviewed and fixed right
now, so stay tuned.  I expect it to be fixed when BETA5 is built.

Scott