[dpdk-stable] [PATCH v2 2/3] [18.11] net/mlx5: remove device register remap

[Ali Alnubani]

> -----Original Message-----
> From: stable <stable-bounces at dpdk.org> On Behalf Of Viacheslav Ovsiienko
> Sent: Tuesday, July 7, 2020 10:13 AM
> To: stable at dpdk.org
> Cc: ktraynor at redhat.com; Yongseok Koh <yskoh at mellanox.com>
> Subject: [dpdk-stable] [PATCH v2 2/3] [18.11] net/mlx5: remove device
> register remap
> 
> From: Yongseok Koh <yskoh at mellanox.com>
> 
> UAR (User Access Region) register does not need to be remapped for
> primary process but it should be remapped only for secondary process.
> UAR register table is in the process private structure in rte_eth_devices[],
> (struct mlx5_proc_priv *)rte_eth_devices[port_id].process_private
> 
> The actual UAR table follows the data structure and the table is used for both
> Tx and Rx.
> 
> For Tx, BlueFlame in UAR is used to ring the doorbell.
> MLX5_TX_BFREG(txq) is defined to get a register for the txq. Processes
> access its own private data to acquire the register from the UAR table.
> 
> For Rx, the doorbell in UAR is required in arming CQ event. However, it is a
> known issue that the register isn't remapped for secondary process.
> 
> Signed-off-by: Yongseok Koh <yskoh at mellanox.com>
> Signed-off-by: Viacheslav Ovsiienko <viacheslavo at mellanox.com>

Tested-by: Ali Alnubani <alialnu at mellanox.com>