Subject: Re: [patch net-next 4/4] mlxsw: Introduce Mellanox SwitchX-2 ASIC support

From: Alexander Duyck <[email-masked]>
Date: Thu, 23 Jul 2015 10:19:46 -0700

On 07/23/2015 08:43 AM, Jiri Pirko wrote:
> From: Jiri Pirko <[email-masked]>
>
> Benefit from the previously introduced Mellanox Switch infrastructure and
> add driver for SwitchX-2 ASIC. Note that this driver is very simple now.
> It implements bare minimum for getting device to work on slow-path.
> Fast-path offload functionality is going to be added soon.
>
> Signed-off-by: Jiri Pirko <[email-masked]>
> Signed-off-by: Ido Schimmel <[email-masked]>
> Signed-off-by: Elad Raz <[email-masked]>
> ---
>   drivers/net/ethernet/mellanox/mlxsw/Kconfig    |   11 +
>   drivers/net/ethernet/mellanox/mlxsw/Makefile   |    2 +
>   drivers/net/ethernet/mellanox/mlxsw/core.h     |    2 +
>   drivers/net/ethernet/mellanox/mlxsw/pci.c      |    3 +
>   drivers/net/ethernet/mellanox/mlxsw/pci.h      |    1 +
>   drivers/net/ethernet/mellanox/mlxsw/port.h     |    4 +
>   drivers/net/ethernet/mellanox/mlxsw/switchx2.c | 1541 ++++++++++++++++++++++++
>   drivers/net/ethernet/mellanox/mlxsw/txheader.h |   80 ++
>   8 files changed, 1644 insertions(+)
>   create mode 100644 drivers/net/ethernet/mellanox/mlxsw/switchx2.c
>   create mode 100644 drivers/net/ethernet/mellanox/mlxsw/txheader.h
>

<snip>

> diff --git a/drivers/net/ethernet/mellanox/mlxsw/switchx2.c b/drivers/net/ethernet/mellanox/mlxsw/switchx2.c
> new file mode 100644
> index 0000000..15dc53b
> --- /dev/null
> +++ b/drivers/net/ethernet/mellanox/mlxsw/switchx2.c
> @@ -0,0 +1,1541 @@
> +/*
> + * drivers/net/ethernet/mellanox/mlxsw/switchx2.c
> + * Copyright (c) 2015 Mellanox Technologies. All rights reserved.
> + * Copyright (c) 2015 Jiri Pirko <[email-masked]>
> + * Copyright (c) 2015 Ido Schimmel <[email-masked]>
> + * Copyright (c) 2015 Elad Raz <[email-masked]>
> + *
> + * Redistribution and use in source and binary forms, with or without
> + * modification, are permitted provided that the following conditions are met:
> + *
> + * 1. Redistributions of source code must retain the above copyright
> + *    notice, this list of conditions and the following disclaimer.
> + * 2. Redistributions in binary form must reproduce the above copyright
> + *    notice, this list of conditions and the following disclaimer in the
> + *    documentation and/or other materials provided with the distribution.
> + * 3. Neither the names of the copyright holders nor the names of its
> + *    contributors may be used to endorse or promote products derived from
> + *    this software without specific prior written permission.
> + *
> + * Alternatively, this software may be distributed under the terms of the
> + * GNU General Public License ("GPL") version 2 as published by the Free
> + * Software Foundation.
> + *
> + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
> + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
> + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
> + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
> + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
> + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
> + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
> + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
> + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
> + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
> + * POSSIBILITY OF SUCH DAMAGE.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/types.h>
> +#include <linux/netdevice.h>
> +#include <linux/etherdevice.h>
> +#include <linux/slab.h>
> +#include <linux/device.h>
> +#include <linux/skbuff.h>
> +#include <linux/if_vlan.h>
> +#include <net/switchdev.h>
> +#include <generated/utsrelease.h>
> +
> +#include "core.h"
> +#include "reg.h"
> +#include "port.h"
> +#include "trap.h"
> +#include "txheader.h"
> +
> +static const char mlxsw_sx_driver_name[] = "mlxsw_switchx2";
> +static const char mlxsw_sx_driver_version[] = "1.0";
> +
> +struct mlxsw_sx_port;
> +
> +#define MLXSW_SW_HW_ID_LEN 6
> +
> +struct mlxsw_sx {
> +	struct mlxsw_sx_port **ports;
> +	struct mlxsw_core *core;
> +	const struct mlxsw_bus_info *bus_info;
> +	u8 hw_id[MLXSW_SW_HW_ID_LEN];
> +};
> +
> +struct mlxsw_sx_port_pcpu_stats {
> +	u64			rx_packets;
> +	u64			rx_bytes;
> +	u64			tx_packets;
> +	u64			tx_bytes;
> +	struct u64_stats_sync	syncp;
> +	u32			tx_dropped;
> +};
> +

It seems like this is the second time I have seen someone have to invent 
a new pcpu stats to add tx_dropped.  Maybe you should look at adding 
tx_dropped to pcpu_sw_netstats and just use that.