From: Yongseok Koh <yskoh@mellanox.com>
To: Shahaf Shuler <shahafs@mellanox.com>
Cc: dev <dev@dpdk.org>
Subject: [dpdk-dev] [RFC] net/mlx: enable DMA memory registration from secondary process
Date: Fri, 1 Mar 2019 01:39:59 +0000 [thread overview]
Message-ID: <9D1D0CCF-40D0-45FF-827A-0FC7F19A6446@mellanox.com> (raw)
For both mlx4 and mlx5, the Memory Region (MR) for DMA memory can't be created
from secondary process due to lib/driver limitation. It is prohibited in the
code for now, thus all the memory being used by secondary process should be
registered on initialization.
mlx5_mr_create(...)
{
[...]
if (rte_eal_process_type() != RTE_PROC_PRIMARY) {
DRV_LOG(WARNING,
"port %u using address (%p) of unregistered mempool"
" in secondary process, please create mempool"
" before rte_eth_dev_start()",
dev->data->port_id, (void *)addr);
rte_errno = EPERM;
goto err_nolock;
}
[...]
}
In 19.05, this restriction will be removed and secondary process will be able to
send a request of creating a MR to primary process via rte_mp_*() APIs. Once a
MR is created by primary process, it will be immediately visible to the
secondary through the shared private data, struct mlx[4|5]_priv.
No changes would be needed outside of mlx4/5 PMD.
Signed-off-by: Yongseok Koh <yskoh@mellanox.com>
reply other threads:[~2019-03-01 1:40 UTC|newest]
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