netdev - Re: [PATCH net-next 01/13] net: sched: Pass qdisc reference in struct flow_block

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Date:   Fri, 10 Jul 2020 16:15:00 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Ido Schimmel <idosch@...sch.org>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        jiri@...lanox.com, petrm@...lanox.com, mlxsw@...lanox.com,
        michael.chan@...adcom.com, saeedm@...lanox.com, leon@...nel.org,
        kadlec@...filter.org, fw@...len.de, jhs@...atatu.com,
        xiyou.wangcong@...il.com, simon.horman@...ronome.com,
        Ido Schimmel <idosch@...lanox.com>
Subject: Re: [PATCH net-next 01/13] net: sched: Pass qdisc reference in
 struct flow_block_offload

On Fri, Jul 10, 2020 at 04:56:54PM +0300, Ido Schimmel wrote:
> From: Petr Machata <petrm@...lanox.com>
> 
> Previously, shared blocks were only relevant for the pseudo-qdiscs ingress
> and clsact. Recently, a qevent facility was introduced, which allows to
> bind blocks to well-defined slots of a qdisc instance. RED in particular
> got two qevents: early_drop and mark. Drivers that wish to offload these
> blocks will be sent the usual notification, and need to know which qdisc it
> is related to.
> 
> To that end, extend flow_block_offload with a "sch" pointer, and initialize
> as appropriate. This prompts changes in the indirect block facility, which
> now tracks the scheduler instead of the netdevice. Update signatures of
> several functions similarly. Deduce the device from the scheduler when
> necessary.
> 
> Signed-off-by: Petr Machata <petrm@...lanox.com>
> Reviewed-by: Jiri Pirko <jiri@...lanox.com>
> Signed-off-by: Ido Schimmel <idosch@...lanox.com>
> ---
>  drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c  | 11 ++++++----
>  .../ethernet/mellanox/mlx5/core/en/rep/tc.c   | 11 +++++-----
>  .../net/ethernet/netronome/nfp/flower/main.h  |  2 +-
>  .../ethernet/netronome/nfp/flower/offload.c   | 11 ++++++----
>  include/net/flow_offload.h                    |  9 ++++----
>  net/core/flow_offload.c                       | 12 +++++------
>  net/netfilter/nf_flow_table_offload.c         | 17 +++++++--------
>  net/netfilter/nf_tables_offload.c             | 20 ++++++++++--------
>  net/sched/cls_api.c                           | 21 +++++++++++--------
>  9 files changed, 63 insertions(+), 51 deletions(-)
> 
[...]
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/rep/tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en/rep/tc.c
> index eefeb1cdc2ee..4fc42c1955ff 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en/rep/tc.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/rep/tc.c
> @@ -404,7 +404,7 @@ static void mlx5e_rep_indr_block_unbind(void *cb_priv)
>  static LIST_HEAD(mlx5e_block_cb_list);
>  
>  static int
> -mlx5e_rep_indr_setup_block(struct net_device *netdev,
> +mlx5e_rep_indr_setup_block(struct Qdisc *sch,
>  			   struct mlx5e_rep_priv *rpriv,
>  			   struct flow_block_offload *f,
>  			   flow_setup_cb_t *setup_cb,
> @@ -412,6 +412,7 @@ mlx5e_rep_indr_setup_block(struct net_device *netdev,
>  			   void (*cleanup)(struct flow_block_cb *block_cb))
>  {
>  	struct mlx5e_priv *priv = netdev_priv(rpriv->netdev);
> +	struct net_device *netdev = sch->dev_queue->dev;

This break indirect block support for netfilter since the driver
is assuming a Qdisc object.