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Date: Thu, 16 Feb 2023 16:51:25 +0100
From: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To: Saeed Mahameed <saeed@...nel.org>
CC: "David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Eric Dumazet <edumazet@...gle.com>,
"Saeed Mahameed" <saeedm@...dia.com>, <netdev@...r.kernel.org>,
Tariq Toukan <tariqt@...dia.com>,
Vlad Buslov <vladbu@...dia.com>, Oz Shlomo <ozsh@...dia.com>,
Paul Blakey <paulb@...dia.com>
Subject: Re: [net-next 5/9] net/mlx5e: Implement CT entry update
On Wed, Feb 15, 2023 at 04:09:14PM -0800, Saeed Mahameed wrote:
> From: Vlad Buslov <vladbu@...dia.com>
>
> With support for UDP NEW offload the flow_table may now send updates for
> existing flows. Support properly replacing existing entries by updating
> flow restore_cookie and replacing the rule with new one with the same match
> but new mod_hdr action that sets updated ctinfo.
>
> Signed-off-by: Vlad Buslov <vladbu@...dia.com>
> Reviewed-by: Oz Shlomo <ozsh@...dia.com>
> Reviewed-by: Paul Blakey <paulb@...dia.com>
> Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
> ---
> .../ethernet/mellanox/mlx5/core/en/tc_ct.c | 118 +++++++++++++++++-
> 1 file changed, 117 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.c b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.c
> index 193562c14c44..76e86f83b6ac 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.c
> @@ -871,6 +871,68 @@ mlx5_tc_ct_entry_add_rule(struct mlx5_tc_ct_priv *ct_priv,
> return err;
> }
>
> +static int
> +mlx5_tc_ct_entry_replace_rule(struct mlx5_tc_ct_priv *ct_priv,
> + struct flow_rule *flow_rule,
> + struct mlx5_ct_entry *entry,
> + bool nat, u8 zone_restore_id)
> +{
> + struct mlx5_ct_zone_rule *zone_rule = &entry->zone_rules[nat];
> + struct mlx5_flow_attr *attr = zone_rule->attr, *old_attr;
> + struct mlx5e_mod_hdr_handle *mh;
> + struct mlx5_ct_fs_rule *rule;
> + struct mlx5_flow_spec *spec;
> + int err;
> +
> + spec = kvzalloc(sizeof(*spec), GFP_KERNEL);
> + if (!spec)
> + return -ENOMEM;
> +
> + old_attr = mlx5_alloc_flow_attr(ct_priv->ns_type);
> + if (!attr) {
when can attr == NULL? maybe check it in the first place before allocing
spec above?
> + err = -ENOMEM;
> + goto err_attr;
> + }
> + *old_attr = *attr;
> +
> + err = mlx5_tc_ct_entry_create_mod_hdr(ct_priv, attr, flow_rule, &mh, zone_restore_id,
> + nat, mlx5_tc_ct_entry_has_nat(entry));
> + if (err) {
> + ct_dbg("Failed to create ct entry mod hdr");
> + goto err_mod_hdr;
> + }
> +
> + mlx5_tc_ct_set_tuple_match(ct_priv, spec, flow_rule);
> + mlx5e_tc_match_to_reg_match(spec, ZONE_TO_REG, entry->tuple.zone, MLX5_CT_ZONE_MASK);
> +
> + rule = ct_priv->fs_ops->ct_rule_add(ct_priv->fs, spec, attr, flow_rule);
> + if (IS_ERR(rule)) {
> + err = PTR_ERR(rule);
> + ct_dbg("Failed to add replacement ct entry rule, nat: %d", nat);
> + goto err_rule;
> + }
> +
> + ct_priv->fs_ops->ct_rule_del(ct_priv->fs, zone_rule->rule);
> + zone_rule->rule = rule;
> + mlx5_tc_ct_entry_destroy_mod_hdr(ct_priv, old_attr, zone_rule->mh);
> + zone_rule->mh = mh;
> +
> + kfree(old_attr);
> + kvfree(spec);
not a big deal but you could make a common goto below with a different
name
> + ct_dbg("Replaced ct entry rule in zone %d", entry->tuple.zone);
> +
> + return 0;
> +
> +err_rule:
> + mlx5_tc_ct_entry_destroy_mod_hdr(ct_priv, zone_rule->attr, mh);
> + mlx5_put_label_mapping(ct_priv, attr->ct_attr.ct_labels_id);
> +err_mod_hdr:
> + kfree(old_attr);
> +err_attr:
> + kvfree(spec);
> + return err;
> +}
> +
> static bool
> mlx5_tc_ct_entry_valid(struct mlx5_ct_entry *entry)
> {
> @@ -1065,6 +1127,52 @@ mlx5_tc_ct_entry_add_rules(struct mlx5_tc_ct_priv *ct_priv,
> return err;
> }
>
> +static int
> +mlx5_tc_ct_entry_replace_rules(struct mlx5_tc_ct_priv *ct_priv,
> + struct flow_rule *flow_rule,
> + struct mlx5_ct_entry *entry,
> + u8 zone_restore_id)
> +{
> + int err;
> +
> + err = mlx5_tc_ct_entry_replace_rule(ct_priv, flow_rule, entry, false,
would it make sense to replace the bool nat in here with some kind of
enum?
> + zone_restore_id);
> + if (err)
> + return err;
> +
> + err = mlx5_tc_ct_entry_replace_rule(ct_priv, flow_rule, entry, true,
> + zone_restore_id);
> + if (err)
> + mlx5_tc_ct_entry_del_rule(ct_priv, entry, false);
> + return err;
> +}
> +
> +static int
> +mlx5_tc_ct_block_flow_offload_replace(struct mlx5_ct_ft *ft, struct flow_rule *flow_rule,
> + struct mlx5_ct_entry *entry, unsigned long cookie)
> +{
> + struct mlx5_tc_ct_priv *ct_priv = ft->ct_priv;
> + int err;
> +
> + err = mlx5_tc_ct_entry_replace_rules(ct_priv, flow_rule, entry, ft->zone_restore_id);
> + if (!err)
> + return 0;
> +
> + /* If failed to update the entry, then look it up again under ht_lock
> + * protection and properly delete it.
> + */
> + spin_lock_bh(&ct_priv->ht_lock);
> + entry = rhashtable_lookup_fast(&ft->ct_entries_ht, &cookie, cts_ht_params);
> + if (entry) {
> + rhashtable_remove_fast(&ft->ct_entries_ht, &entry->node, cts_ht_params);
> + spin_unlock_bh(&ct_priv->ht_lock);
> + mlx5_tc_ct_entry_put(entry);
> + } else {
> + spin_unlock_bh(&ct_priv->ht_lock);
> + }
> + return err;
> +}
> +
> static int
> mlx5_tc_ct_block_flow_offload_add(struct mlx5_ct_ft *ft,
> struct flow_cls_offload *flow)
> @@ -1087,9 +1195,17 @@ mlx5_tc_ct_block_flow_offload_add(struct mlx5_ct_ft *ft,
> spin_lock_bh(&ct_priv->ht_lock);
> entry = rhashtable_lookup_fast(&ft->ct_entries_ht, &cookie, cts_ht_params);
> if (entry && refcount_inc_not_zero(&entry->refcnt)) {
> + if (entry->restore_cookie == meta_action->ct_metadata.cookie) {
> + spin_unlock_bh(&ct_priv->ht_lock);
> + mlx5_tc_ct_entry_put(entry);
> + return -EEXIST;
> + }
> + entry->restore_cookie = meta_action->ct_metadata.cookie;
> spin_unlock_bh(&ct_priv->ht_lock);
> +
> + err = mlx5_tc_ct_block_flow_offload_replace(ft, flow_rule, entry, cookie);
> mlx5_tc_ct_entry_put(entry);
in case of err != 0, haven't you already put the entry inside
mlx5_tc_ct_block_flow_offload_replace() ?
> - return -EEXIST;
> + return err;
> }
> spin_unlock_bh(&ct_priv->ht_lock);
>
> --
> 2.39.1
>
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