Use of IB Drivers Co-resident with OPA on Debian Jessie » History » Version 4
Brian Smith, 08/31/2017 07:12 PM
1 | 1 | Brian Smith | # Use of IB Drivers Co-resident with OPA |
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3 | The Omni-Path hardware and drivers should operate correctly when co-resident with InfiniBand HCAs and their associated drivers. However, on Jessie (Debian 8.x), kmod-ifs-kernel-updates installs a version of ib_mad that includes jumbo MAD support. This version of ib_mad is required for OPA, and is incompatible with the InfiniBand drivers that are in-box with Jessie. |
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5 | The behavior that will be experienced when loading an in-box InfiniBand driver co-resident with OPA is a report of "invalid parameters". Syslog will contain reports of "disagrees about version of symbol ib_unregister_mad_agent", etc. This is due to the fact that the updated ib_mad module has a different version of its ABI than what is expected by the in-box drivers. |
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7 | In order to use the in-box InfiniBand drivers with the jumbo-mad enabled ib_mad module, they must be recompiled against the updated headers. This process is outlined below. The build system must have build-essentials installed. The build should be executed as a non-root user. |
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9 | This process assumes that the mlx4 driver is to be included with kmod-ifs-kernel-updates. It should apply to other InfiniBand drivers. |
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11 | ``` |
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12 | # mkdir ifsbuild |
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13 | # cd ifsbuild |
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14 | # dget http://security.debian.org/debian-security/pool/updates/main/l/linux/linux_3.16.43-2+deb8u3.dsc |
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15 | # cp ../IntelOPA-IFS.DEBIAN8-x86_64.10.4.2.0.7-2/packages/ifs-kernel-updates*{orig,debian}* . |
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16 | # tar xf ifs-kernel-updates_3.16.0-616.orig.tar.gz |
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17 | # cd ifs-kernel-updates-3.10.0_327.el7.x86_64 |
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18 | 3 | Brian Smith | # tar xf ../ifs-kernel-updates_3.16.0-616-1ifs.debian.tar.xz |
19 | 1 | Brian Smith | # QUILT_PATCHES=“debian/patches" quilt push -a |
20 | # cp -r ../linux-3.16.43/drivers/infiniband/hw/mlx4/ . |
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21 | # cd mlx4 |
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22 | # mv Makefile Makefile.org |
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23 | 4 | Brian Smith | # cd .. |
24 | 1 | Brian Smith | ``` |
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26 | 2 | Brian Smith | ```mlx4/Makefile``` must now be created. The source below will work for the current version of the mlx4 driver (Jessie 8.9). ```Makefile.org``` should be examined to determine the correct directives for ```obj-$(CONFIG_MLX4_INFINIBAND)``` and ```mlx4_ib-y```. |
27 | 1 | Brian Smith | |
28 | ``` |
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29 | # |
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30 | # mlx4 module |
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31 | # |
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32 | # |
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33 | # Called from the kernel module build system. |
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34 | # |
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35 | ifneq ($(KERNELRELEASE),) |
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36 | #kbuild part of makefile |
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38 | ccflags-y := -I$(src)/../include |
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40 | obj-$(CONFIG_MLX4_INFINIBAND) += mlx4_ib.o |
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42 | mlx4_ib-y := ah.o cq.o doorbell.o mad.o main.o mr.o qp.o srq.o mcg.o cm.o alias_GUID.o sysfs.o |
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43 | |||
44 | else |
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45 | #normal makefile |
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46 | KDIR ?= /lib/modules/`uname -r`/build |
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47 | |||
48 | default: |
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49 | $(MAKE) -C $(KDIR) M=$$PWD NOSTDINC_FLAGS=-I$$PWD |
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50 | |||
51 | clean: |
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52 | $(MAKE) -C $(KDIR) M=$$PWD clean |
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53 | |||
54 | install: |
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55 | $(MAKE) INSTALL_MOD_DIR=updates -C $(KDIR) M=$$PWD modules_install |
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56 | |||
57 | endif |
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58 | ``` |
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60 | Now, the top-level Makefile should be edited to include mlx4 in the build. Add mlx4/ to the end of the obj-y directive. The trailing slash is necessary. |
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61 | |||
62 | ``` |
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63 | obj-y := rdmavt/ ib_uverbs/ hfi1/ ib_mad/ opa_compat/ \ |
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64 | ib_umad/ ib_sa/ ib_cm/ ib_ucm/ rdma_cm/ rdma_ucm/ ib_srpt/ ib_ipoib/ mlx4/ |
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65 | ``` |
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67 | Now, build the package via the command: |
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69 | ``` |
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70 | # debuild -us -uc -b |
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71 | ``` |
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73 | The build should complete without errors, although lintian may complain about a few things. The package may now be installed with: |
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75 | ``` |
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76 | # sudo dpkg -i ../kmod-ifs-kernel-updates_3.16.0-616-1ifs_amd64.deb |
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77 | # depmod -a |
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78 | ``` |
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80 | The system should now have a recompiled driver installed to ```/lib/modules/3.16.0-4-amd64/updates/ifs-kernel-updates/mlx4/mlx4_ib.ko``` and ```modprobe mlx4_ib``` should execute without errors. ```ibstat``` should include information for the mlx4_0 device. |
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82 | The system will also need the libmlx4 package installed in order to provide user-space ibverbs access. User-space packages should not require recompilation. |