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authorYongseok Koh <yskoh@mellanox.com>2018-09-24 18:36:47 +0000
committerFerruh Yigit <ferruh.yigit@intel.com>2018-10-11 18:53:49 +0200
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parent31912d9924039c3a4f58e1bb00f380e5b4c7bd81 (diff)
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net/mlx5: support externally allocated static memory
When MLX PMD registers memory for DMA, it accesses the global memseg list of DPDK to maximize the range of registration so that LKey search can be more efficient. Granularity of MR registration is per page. Externally allocated memory shouldn't be used for DMA because it can't be searched in the memseg list and free event can't be tracked by DPDK. If it is used, the following error will occur: net_mlx5: port 0 unable to find virtually contiguous chunk for address (0x5600017587c0). rte_memseg_contig_walk() failed. There's a pending patchset [1] which enables externally allocated memory. Once it is merged, users can register their own memory out of EAL then that will resolve this issue. Meanwhile, if the external memory is static (allocated on startup and never freed), such memory can also be registered by little tweak in the code. [1] http://patches.dpdk.org/project/dpdk/list/?series=1415 This patch is not a bug fix but needs to be included in stable versions. Fixes: 974f1e7ef146 ("net/mlx5: add new memory region support") Cc: stable@dpdk.org Signed-off-by: Yongseok Koh <yskoh@mellanox.com>
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