Hi Shahaf,
On Tue, Jan 23, 2018 at 07:08:20PM +0200, Shahaf Shuler wrote:
> Secondary process is not allowed to register mempools on the flight.
>
> The code will return invalid memory key for such case.
>
> Fixes: 87ec44ce1651 ("net/mlx5: add operations for secondary process")
> Cc: sta...@dpdk.org
>
> Signed-off-by: Shahaf Shuler <shah...@mellanox.com>
> Signed-off-by: Xueming Li <xuemi...@mellanox.com>
> ---
> doc/guides/nics/mlx5.rst | 7 ++++++-
> drivers/net/mlx5/mlx5_rxtx.h | 17 ++++++++++++++---
> 2 files changed, 20 insertions(+), 4 deletions(-)
>
> diff --git a/doc/guides/nics/mlx5.rst b/doc/guides/nics/mlx5.rst
> index bdc2216c0..2f860402f 100644
> --- a/doc/guides/nics/mlx5.rst
> +++ b/doc/guides/nics/mlx5.rst
> @@ -106,7 +106,12 @@ Limitations
>
> - Inner RSS for VXLAN frames is not supported yet.
> - Hardware checksum RX offloads for VXLAN inner header are not supported yet.
> -- Forked secondary process not supported.
> +- For secondary process:
> +
> + - Forked secondary process not supported.
> + - All mempools must be initialized before rte_eth_dev_start().
> + - Number of mempools must less than CONFIG_RTE_LIBRTE_MLX5_TX_MP_CACHE
Why such limitation? Registering a new memory is independent of
searching a new one when the cache is too small.
> - Flow pattern without any specific vlan will match for vlan packets as well:
>
> When VLAN spec is not specified in the pattern, the matching rule will be
> created with VLAN as a wild card.
> diff --git a/drivers/net/mlx5/mlx5_rxtx.h b/drivers/net/mlx5/mlx5_rxtx.h
> index a63364d79..79cdfc793 100644
> --- a/drivers/net/mlx5/mlx5_rxtx.h
> +++ b/drivers/net/mlx5/mlx5_rxtx.h
> @@ -550,6 +550,7 @@ mlx5_tx_mb2mr(struct mlx5_txq_data *txq, struct rte_mbuf
> *mb)
> uint16_t i = txq->mr_cache_idx;
> uintptr_t addr = rte_pktmbuf_mtod(mb, uintptr_t);
> struct mlx5_mr *mr;
> + struct rte_mempool *mp;
>
> assert(i < RTE_DIM(txq->mp2mr));
> if (likely(txq->mp2mr[i]->start <= addr && txq->mp2mr[i]->end >= addr))
> @@ -563,14 +564,24 @@ mlx5_tx_mb2mr(struct mlx5_txq_data *txq, struct
> rte_mbuf *mb)
> if (txq->mp2mr[i]->start <= addr &&
> txq->mp2mr[i]->end >= addr) {
> assert(txq->mp2mr[i]->lkey != (uint32_t)-1);
> - assert(rte_cpu_to_be_32(txq->mp2mr[i]->mr->lkey) ==
> - txq->mp2mr[i]->lkey);
> + if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
> + assert(rte_cpu_to_be_32(txq->mp2mr[i]->mr->lkey)
> + == txq->mp2mr[i]->lkey);
> + }
This code should be inside priv_txq_mp2mr_reg() to let the secondary
search inside the MR list when the cache is too small.
If it does not find any MR it should fail before calling
priv_mr_new().
> txq->mr_cache_idx = i;
> return txq->mp2mr[i]->lkey;
> }
> }
> txq->mr_cache_idx = 0;
> - mr = mlx5_txq_mp2mr_reg(txq, mlx5_tx_mb2mp(mb), i);
> + mp = mlx5_tx_mb2mp(mb);
> + if (rte_eal_process_type() != RTE_PROC_PRIMARY) {
> + WARN("Using unregistered mempool 0x%p(%s) in secondary process,"
> + " please create mempool before rte_eth_dev_start()",
> + (void *)mp, mp->name);
> + assert(rte_eal_process_type() == RTE_PROC_PRIMARY);
> + return (uint32_t)-1;
> + }
> + mr = mlx5_txq_mp2mr_reg(txq, mp, i);
> /*
> * Request the reference to use in this queue, the original one is
> * kept by the control plane.
> --
> 2.12.0
--
Nélio Laranjeiro
6WIND
