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Groups > linux.kernel > #1380251
| From | "Martin K. Petersen" <martin.petersen@oracle.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH 0/3] hisi_sas: device id/IPTT collision workaround |
| Date | 2016-04-15 23:00 +0200 |
| Message-ID | <roj0l-Bj-3@gated-at.bofh.it> (permalink) |
| References | <robYS-3E4-17@gated-at.bofh.it> |
| Organization | Oracle Corporation |
>>>>> "John" == John Garry <john.garry@huawei.com> writes: John> This patchset introduces a workaround to a hw quirk in the John> HiSilicon SAS controller v2 hw. John> The quirk is as follows: When a SATA and SAS frame arrives at the John> host at the same time the frames may be swapped under this John> condition: SATA device id bit [10:0] == SAS frame IPTT bit [10:0] John> The workaround is to ensure these 2 values never match. The John> workaround algorithm is as follows: - SATA device id bit0 always 0 John> - SATA IPTT has no restriction - SAS IPTT bit0 always 1 - SAS John> device id has no restriction John> The major restriction of this workaround is the SAS IPTT range is John> halved, but this should be ok as testing has shown that even using John> half the IPTT range does not affect performance. Applied to 4.7/scsi-queue. Thanks! -- Martin K. Petersen Oracle Linux Engineering
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[PATCH 0/3] hisi_sas: device id/IPTT collision workaround John Garry <john.garry@huawei.com> - 2016-04-15 15:30 +0200 Re: [PATCH 0/3] hisi_sas: device id/IPTT collision workaround "Martin K. Petersen" <martin.petersen@oracle.com> - 2016-04-15 23:00 +0200
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