51 lines
1.3 KiB
Plaintext
51 lines
1.3 KiB
Plaintext
This README is for userspace RDMA cm library.
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Building
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========
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To make this directory, run:
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./autogen.sh && ./configure && make && make install
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Typically the autogen and configure steps only need be done the first
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time unless configure.in or Makefile.am changes.
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Libraries are installed by default at /usr/local/lib.
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Device files
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============
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The userspace CMA uses a single device file regardless of the number
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of adapters or ports present.
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To create the appropriate character device file automatically with
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udev, a rule like
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KERNEL="rdma_cm", NAME="infiniband/%k", MODE="0666"
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can be used. This will create the device node named
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/dev/infiniband/rdma_cm
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or you can create it manually
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mknod /dev/infiniband/rdma_cm c 231 255
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Common issues
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=============
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Using multiple interfaces
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The librdmacm does support multiple interfaces. To make use
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of multiple interfaces, however, you need to instruct linux
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to only send ARP reples on the interface targetted in the ARP
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request. This can be done using a command similar to the
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following:
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sysctl -w net.ipv4.conf.all.arp_ignore=2
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Without this change, it's possible for linux to resopnd to ARP
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requests on a different interface (IP address) than the IP
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address carried in the ARP request. This causes the RDMA stack
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to incorrectly map the remote IP address to the wrong RDMA
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device.
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