Monday, September 24, 2018 9:37 PM, Yongseok Koh: > Subject: [PATCH 1/2] net/mlx4: 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: 9797bfcce1c9 ("net/mlx4: add new memory region support") > Cc: sta...@dpdk.org > Cc: "Damjan Marion (damarion)" <damar...@cisco.com> > Cc: Ed Warnicke <hagb...@gmail.com> > > Signed-off-by: Yongseok Koh <ys...@mellanox.com> > ---
Series applied to next-net-mlx, thanks.
