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nvme: Update p2p DMA documentation to indicate how to check for support

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Change-Id: I8d7de13c6c4f8cfb5ffabc21aa2d793774421034
Signed-off-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-on: https://review.gerrithub.io/c/442638
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: wuzhouhui <wuzhouhui@kingsoft.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
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Ben Walker 2019-01-29 15:15:04 -07:00 committed by Jim Harris
parent 9ca35dfc83
commit 1de99be6cf
1 changed files with 11 additions and 1 deletions
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doc/peer_2_peer.md
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@ -31,13 +31,23 @@ Key Functions | Description
------------------------------------------- | -----------
spdk_nvme_ctrlr_alloc_cmb_io_buffer() | @copybrief spdk_nvme_ctrlr_alloc_cmb_io_buffer()
spdk_nvme_ctrlr_free_cmb_io_buffer() | @copybrief spdk_nvme_ctrlr_free_cmb_io_buffer()
spdk_nvme_ctrlr_get_regs_cmbsz() | @copybrief spdk_nvme_ctrlr_get_regs_cmbsz()
# Determining device support {#p2p_support}
SPDK's identify example application displays whether a device has a controller
memory buffer and which operations it supports. Run it as follows:
~~~{.sh}
./examples/nvme/identify/identify -r traddr:<pci id of ssd>
~~~
# cmb_copy: An example P2P Application {#p2p_cmb_copy}
Run the cmb_copy example application.
~~~{.sh}
./examples/nvme/cmb_copy -r <pci id of write ssd>-1-0-1 -w <pci id of write ssd>-1-0-1 -c <pci id of the ssd with cmb>
./examples/nvme/cmb_copy/cmb_copy -r <pci id of write ssd>-1-0-1 -w <pci id of write ssd>-1-0-1 -c <pci id of the ssd with cmb>
~~~
This should copy a single LBA (LBA 0) from namespace 1 on the read
NVMe SSD to LBA 0 on namespace 1 on the write SSD using the CMB as the