Based on kernel version 3.19. Page generated on 2015-02-13 21:22 EST.
1 2 LPFC Driver Release Notes: 3 4 ============================================================================= 5 6 7 IMPORTANT: 8 9 Starting in the 8.0.17 release, the driver began to be targeted strictly 10 toward the upstream kernel. As such, we removed #ifdefs for older kernels 11 (pre 2.6.10). The 8.0.16 release should be used if the driver is to be 12 run on one of the older kernels. 13 14 The proposed modifications to the transport layer for FC remote ports 15 and extended attribute support is now part of the upstream kernel 16 as of 2.6.12. We no longer need to provide patches for this support, 17 nor a *full* version which has old an new kernel support. 18 19 The driver now requires a 2.6.12 (if pre-release, 2.6.12-rc1) or later 20 kernel. 21 22 Please heed these dependencies.... 23 24 25 ******************************************************************** 26 27 28 The following information is provided for additional background on the 29 history of the driver as we push for upstream acceptance. 30 31 Cable pull and temporary device Loss: 32 33 In older revisions of the lpfc driver, the driver internally queued i/o 34 received from the midlayer. In the cases where a cable was pulled, link 35 jitter, or a device temporarily loses connectivity (due to its cable 36 being removed, a switch rebooting, or a device reboot), the driver could 37 hide the disappearance of the device from the midlayer. I/O's issued to 38 the LLDD would simply be queued for a short duration, allowing the device 39 to reappear or link come back alive, with no inadvertent side effects 40 to the system. If the driver did not hide these conditions, i/o would be 41 errored by the driver, the mid-layer would exhaust its retries, and the 42 device would be taken offline. Manual intervention would be required to 43 re-enable the device. 44 45 The community supporting kernel.org has driven an effort to remove 46 internal queuing from all LLDDs. The philosophy is that internal 47 queuing is unnecessary as the block layer already performs the 48 queuing. Removing the queues from the LLDD makes a more predictable 49 and more simple LLDD. 50 51 As a potential new addition to kernel.org, the 8.x driver was asked to 52 have all internal queuing removed. Emulex complied with this request. 53 In explaining the impacts of this change, Emulex has worked with the 54 community in modifying the behavior of the SCSI midlayer so that SCSI 55 devices can be temporarily suspended while transport events (such as 56 those described) can occur. 57 58 The proposed patch was posted to the linux-scsi mailing list. The patch 59 is contained in the 2.6.10-rc2 (and later) patch kits. As such, this 60 patch is part of the standard 2.6.10 kernel. 61 62 By default, the driver expects the patches for block/unblock interfaces 63 to be present in the kernel. No #define needs to be set to enable support. 64 65 66 Kernel Support 67 68 This source package is targeted for the upstream kernel only. (See notes 69 at the top of this file). It relies on interfaces that are slowing 70 migrating into the kernel.org kernel. 71 72 At this time, the driver requires the 2.6.12 (if pre-release, 2.6.12-rc1) 73 kernel. 74 75 If a driver is needed for older kernels please utilize the 8.0.16 76 driver sources. 77 78 79 Patches 80 81 Thankfully, at this time, patches are not needed. 82