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Date: Tue, 18 Jun 2019 11:00:08 +0000
From: Parav Pandit <parav@...lanox.com>
To: Saeed Mahameed <saeedm@...lanox.com>,
Saeed Mahameed <saeedm@...lanox.com>,
Leon Romanovsky <leonro@...lanox.com>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
Jianbo Liu <jianbol@...lanox.com>,
Eli Britstein <elibr@...lanox.com>,
Roi Dayan <roid@...lanox.com>, Mark Bloch <markb@...lanox.com>
Subject: RE: [PATCH mlx5-next 05/15] net/mlx5: E-Switch, Tag packet with vport
number in VF vports and uplink ingress ACLs
> -----Original Message-----
> From: netdev-owner@...r.kernel.org <netdev-owner@...r.kernel.org> On
> Behalf Of Saeed Mahameed
> Sent: Tuesday, June 18, 2019 12:53 AM
> To: Saeed Mahameed <saeedm@...lanox.com>; Leon Romanovsky
> <leonro@...lanox.com>
> Cc: netdev@...r.kernel.org; linux-rdma@...r.kernel.org; Jianbo Liu
> <jianbol@...lanox.com>; Eli Britstein <elibr@...lanox.com>; Roi Dayan
> <roid@...lanox.com>; Mark Bloch <markb@...lanox.com>
> Subject: [PATCH mlx5-next 05/15] net/mlx5: E-Switch, Tag packet with vport
> number in VF vports and uplink ingress ACLs
>
> From: Jianbo Liu <jianbol@...lanox.com>
>
> When a dual-port VHCA sends a RoCE packet on its non-native port, and the
> packet arrives to its affiliated vport FDB, a mismatch might occur on the rules
> that match the packet source vport as it is not represented by single VHCA only
> in this case. So we change to match on metadata instead of source vport.
> To do that, a rule is created in all vports and uplink ingress ACLs, to save the
> source vport number and vhca id in the packet's metadata in order to match on
> it later.
> The metadata register used is the first of the 32-bit type C registers. It can be
> used for matching and header modify operations. The higher 16 bits of this
> register are for vhca id, and the lower 16 ones is for vport number.
> This change is not for dual-port RoCE only. If HW and FW allow, the vport
> metadata matching is enabled by default.
>
> Signed-off-by: Jianbo Liu <jianbol@...lanox.com>
> Reviewed-by: Eli Britstein <elibr@...lanox.com>
> Reviewed-by: Roi Dayan <roid@...lanox.com>
> Reviewed-by: Mark Bloch <markb@...lanox.com>
> Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
> ---
> .../net/ethernet/mellanox/mlx5/core/eswitch.c | 2 +
> .../net/ethernet/mellanox/mlx5/core/eswitch.h | 9 +
> .../mellanox/mlx5/core/eswitch_offloads.c | 183 ++++++++++++++----
> include/linux/mlx5/eswitch.h | 3 +
> 4 files changed, 161 insertions(+), 36 deletions(-)
>
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
> b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
> index a42a23e505df..1235fd84ae3a 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
> @@ -1168,6 +1168,8 @@ void esw_vport_cleanup_ingress_rules(struct
> mlx5_eswitch *esw,
>
> vport->ingress.drop_rule = NULL;
> vport->ingress.allow_rule = NULL;
> +
> + esw_vport_del_ingress_acl_modify_metadata(esw, vport);
> }
>
> void esw_vport_disable_ingress_acl(struct mlx5_eswitch *esw, diff --git
> a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
> b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
> index 8b9f2cf58e91..4417a195832e 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
> @@ -68,6 +68,8 @@ struct vport_ingress {
> struct mlx5_flow_group *allow_spoofchk_only_grp;
> struct mlx5_flow_group *allow_untagged_only_grp;
> struct mlx5_flow_group *drop_grp;
> + int modify_metadata_id;
> + struct mlx5_flow_handle *modify_metadata_rule;
> struct mlx5_flow_handle *allow_rule;
> struct mlx5_flow_handle *drop_rule;
> struct mlx5_fc *drop_counter;
> @@ -196,6 +198,10 @@ struct mlx5_esw_functions {
> u16 num_vfs;
> };
>
> +enum {
> + MLX5_ESWITCH_VPORT_MATCH_METADATA = BIT(0), };
> +
> struct mlx5_eswitch {
> struct mlx5_core_dev *dev;
> struct mlx5_nb nb;
> @@ -203,6 +209,7 @@ struct mlx5_eswitch {
> struct hlist_head mc_table[MLX5_L2_ADDR_HASH_SIZE];
> struct workqueue_struct *work_queue;
> struct mlx5_vport *vports;
> + u32 flags;
> int total_vports;
> int enabled_vports;
> /* Synchronize between vport change events @@ -240,6 +247,8 @@
> void esw_vport_disable_egress_acl(struct mlx5_eswitch *esw,
> struct mlx5_vport *vport);
> void esw_vport_disable_ingress_acl(struct mlx5_eswitch *esw,
> struct mlx5_vport *vport);
> +void esw_vport_del_ingress_acl_modify_metadata(struct mlx5_eswitch *esw,
> + struct mlx5_vport *vport);
>
> /* E-Switch API */
> int mlx5_eswitch_init(struct mlx5_core_dev *dev); diff --git
> a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
> b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
> index 17abb98b48af..871ae44dc132 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
> @@ -1555,32 +1555,16 @@ static void esw_offloads_devcom_cleanup(struct
> mlx5_eswitch *esw) static int esw_vport_ingress_prio_tag_config(struct
> mlx5_eswitch *esw,
> struct mlx5_vport *vport)
> {
> - struct mlx5_core_dev *dev = esw->dev;
> struct mlx5_flow_act flow_act = {0};
> struct mlx5_flow_spec *spec;
> int err = 0;
>
> /* For prio tag mode, there is only 1 FTEs:
> - * 1) Untagged packets - push prio tag VLAN, allow
> + * 1) Untagged packets - push prio tag VLAN and modify metadata if
> + * required, allow
> * Unmatched traffic is allowed by default
> */
>
> - if (!MLX5_CAP_ESW_INGRESS_ACL(dev, ft_support))
> - return -EOPNOTSUPP;
> -
> - esw_vport_cleanup_ingress_rules(esw, vport);
> -
> - err = esw_vport_enable_ingress_acl(esw, vport);
> - if (err) {
> - mlx5_core_warn(esw->dev,
> - "failed to enable prio tag ingress acl (%d) on
> vport[%d]\n",
> - err, vport->vport);
> - return err;
> - }
> -
> - esw_debug(esw->dev,
> - "vport[%d] configure ingress rules\n", vport->vport);
> -
> spec = kvzalloc(sizeof(*spec), GFP_KERNEL);
> if (!spec) {
> err = -ENOMEM;
> @@ -1596,6 +1580,12 @@ static int esw_vport_ingress_prio_tag_config(struct
> mlx5_eswitch *esw,
> flow_act.vlan[0].ethtype = ETH_P_8021Q;
> flow_act.vlan[0].vid = 0;
> flow_act.vlan[0].prio = 0;
> +
> + if (vport->ingress.modify_metadata_rule) {
> + flow_act.action |=
> MLX5_FLOW_CONTEXT_ACTION_MOD_HDR;
> + flow_act.modify_id = vport->ingress.modify_metadata_id;
> + }
> +
> vport->ingress.allow_rule =
> mlx5_add_flow_rules(vport->ingress.acl, spec,
> &flow_act, NULL, 0);
> @@ -1616,6 +1606,59 @@ static int esw_vport_ingress_prio_tag_config(struct
> mlx5_eswitch *esw,
> return err;
> }
>
> +static int esw_vport_add_ingress_acl_modify_metadata(struct mlx5_eswitch
> *esw,
> + struct mlx5_vport *vport)
> +{
> + u8 action[MLX5_UN_SZ_BYTES(set_action_in_add_action_in_auto)] =
> {};
> + struct mlx5_flow_act flow_act = {};
> + struct mlx5_flow_spec spec = {};
> + int err = 0;
> +
> + MLX5_SET(set_action_in, action, action_type,
> MLX5_ACTION_TYPE_SET);
> + MLX5_SET(set_action_in, action, field,
> MLX5_ACTION_IN_FIELD_METADATA_REG_C_0);
> + MLX5_SET(set_action_in, action, data,
> + mlx5_eswitch_get_vport_metadata_for_match(esw, vport-
> >vport));
> +
> + err = mlx5_modify_header_alloc(esw->dev,
> MLX5_FLOW_NAMESPACE_ESW_INGRESS,
> + 1, action, &vport-
> >ingress.modify_metadata_id);
> +
Please remove the empty line.
> + if (err) {
> + esw_warn(esw->dev,
> + "failed to alloc modify header for vport %d ingress acl
> (%d)\n",
> + vport->vport, err);
> + return err;
> + }
> +
> + flow_act.action = MLX5_FLOW_CONTEXT_ACTION_MOD_HDR |
> MLX5_FLOW_CONTEXT_ACTION_ALLOW;
> + flow_act.modify_id = vport->ingress.modify_metadata_id;
> + vport->ingress.modify_metadata_rule = mlx5_add_flow_rules(vport-
> >ingress.acl,
> + &spec,
> &flow_act, NULL, 0);
> + if (IS_ERR(vport->ingress.modify_metadata_rule)) {
> + err = PTR_ERR(vport->ingress.modify_metadata_rule);
> + esw_warn(esw->dev,
> + "failed to add setting metadata rule for vport %d
> ingress acl, err(%d)\n",
> + vport->vport, err);
> + vport->ingress.modify_metadata_rule = NULL;
> + goto out;
> + }
> +
> +out:
> + if (err)
> + mlx5_modify_header_dealloc(esw->dev, vport-
> >ingress.modify_metadata_id);
> + return err;
> +}
> +
> +void esw_vport_del_ingress_acl_modify_metadata(struct mlx5_eswitch *esw,
> + struct mlx5_vport *vport)
> +{
> + if (vport->ingress.modify_metadata_rule) {
> + mlx5_del_flow_rules(vport->ingress.modify_metadata_rule);
> + mlx5_modify_header_dealloc(esw->dev,
> +vport->ingress.modify_metadata_id);
> +
> + vport->ingress.modify_metadata_rule = NULL;
> + }
> +}
> +
> static int esw_vport_egress_prio_tag_config(struct mlx5_eswitch *esw,
> struct mlx5_vport *vport)
> {
> @@ -1623,6 +1666,9 @@ static int esw_vport_egress_prio_tag_config(struct
> mlx5_eswitch *esw,
> struct mlx5_flow_spec *spec;
> int err = 0;
>
> + if (!MLX5_CAP_GEN(esw->dev, prio_tag_required))
> + return 0;
> +
> /* For prio tag mode, there is only 1 FTEs:
> * 1) prio tag packets - pop the prio tag VLAN, allow
> * Unmatched traffic is allowed by default @@ -1676,27 +1722,77 @@
> static int esw_vport_egress_prio_tag_config(struct mlx5_eswitch *esw,
> return err;
> }
>
> -static int esw_prio_tag_acls_config(struct mlx5_eswitch *esw, int nvports)
> +static int esw_vport_ingress_common_config(struct mlx5_eswitch *esw,
> + struct mlx5_vport *vport)
> {
> - struct mlx5_vport *vport = NULL;
> - int i, j;
> int err;
>
> - mlx5_esw_for_each_vf_vport(esw, i, vport, nvports) {
> + if (!mlx5_eswitch_vport_match_metadata_enabled(esw) &&
> + !MLX5_CAP_GEN(esw->dev, prio_tag_required))
> + return 0;
> +
> + esw_vport_cleanup_ingress_rules(esw, vport);
> +
> + err = esw_vport_enable_ingress_acl(esw, vport);
> + if (err) {
> + esw_warn(esw->dev,
> + "failed to enable ingress acl (%d) on vport[%d]\n",
> + err, vport->vport);
> + return err;
> + }
> +
> + esw_debug(esw->dev,
> + "vport[%d] configure ingress rules\n", vport->vport);
> +
> + if (mlx5_eswitch_vport_match_metadata_enabled(esw)) {
> + err = esw_vport_add_ingress_acl_modify_metadata(esw,
> vport);
> + if (err)
> + goto out;
> + }
> +
> + if (MLX5_CAP_GEN(esw->dev, prio_tag_required) &&
> + (vport->vport >= MLX5_VPORT_FIRST_VF &&
> + vport->vport <= esw->dev->priv.sriov.num_vfs)) {
> err = esw_vport_ingress_prio_tag_config(esw, vport);
> if (err)
> - goto err_ingress;
> - err = esw_vport_egress_prio_tag_config(esw, vport);
> + goto out;
> + }
> +
> +out:
> + if (err)
> + esw_vport_disable_ingress_acl(esw, vport);
> + return err;
> +}
> +
> +static int esw_create_offloads_acl_tables(struct mlx5_eswitch *esw) {
> + struct mlx5_vport *vport;
> + int i, j;
> + int err;
> +
> + mlx5_esw_for_all_vports(esw, i, vport) {
> + err = esw_vport_ingress_common_config(esw, vport);
> if (err)
> - goto err_egress;
> + goto err_ingress;
> +
> + if (vport->vport >= MLX5_VPORT_FIRST_VF &&
> + vport->vport <= esw->dev->priv.sriov.num_vfs) {
> + err = esw_vport_egress_prio_tag_config(esw, vport);
> + if (err)
> + goto err_egress;
> + }
> }
>
> + if (mlx5_eswitch_vport_match_metadata_enabled(esw))
> + esw_info(esw->dev, "Use metadata reg_c as source vport to
> match\n");
> +
> return 0;
>
> err_egress:
> esw_vport_disable_ingress_acl(esw, vport);
> err_ingress:
> - mlx5_esw_for_each_vf_vport_reverse(esw, j, vport, i - 1) {
> + for (j = MLX5_VPORT_PF; j < i; j++) {
> + vport = &esw->vports[j];
> esw_vport_disable_egress_acl(esw, vport);
> esw_vport_disable_ingress_acl(esw, vport);
> }
> @@ -1704,15 +1800,17 @@ static int esw_prio_tag_acls_config(struct
> mlx5_eswitch *esw, int nvports)
> return err;
> }
>
> -static void esw_prio_tag_acls_cleanup(struct mlx5_eswitch *esw)
> +static void esw_destroy_offloads_acl_tables(struct mlx5_eswitch *esw)
> {
> struct mlx5_vport *vport;
> int i;
>
> - mlx5_esw_for_each_vf_vport(esw, i, vport, esw->nvports) {
> + mlx5_esw_for_all_vports(esw, i, vport) {
> esw_vport_disable_egress_acl(esw, vport);
> esw_vport_disable_ingress_acl(esw, vport);
> }
> +
> + esw->flags &= ~MLX5_ESWITCH_VPORT_MATCH_METADATA;
> }
>
> static int esw_offloads_steering_init(struct mlx5_eswitch *esw, int nvports)
> @@ -1722,15 +1820,13 @@ static int esw_offloads_steering_init(struct
> mlx5_eswitch *esw, int nvports)
> memset(&esw->fdb_table.offloads, 0, sizeof(struct offloads_fdb));
> mutex_init(&esw->fdb_table.offloads.fdb_prio_lock);
>
> - if (MLX5_CAP_GEN(esw->dev, prio_tag_required)) {
> - err = esw_prio_tag_acls_config(esw, nvports);
> - if (err)
> - return err;
> - }
> + err = esw_create_offloads_acl_tables(esw);
> + if (err)
> + return err;
>
> err = esw_create_offloads_fdb_tables(esw, nvports);
> if (err)
> - return err;
> + goto create_fdb_err;
>
> err = esw_create_offloads_table(esw, nvports);
> if (err)
> @@ -1748,6 +1844,9 @@ static int esw_offloads_steering_init(struct
> mlx5_eswitch *esw, int nvports)
> create_ft_err:
> esw_destroy_offloads_fdb_tables(esw);
>
> +create_fdb_err:
> + esw_destroy_offloads_acl_tables(esw);
> +
> return err;
> }
>
> @@ -1756,8 +1855,7 @@ static void esw_offloads_steering_cleanup(struct
> mlx5_eswitch *esw)
> esw_destroy_vport_rx_group(esw);
> esw_destroy_offloads_table(esw);
> esw_destroy_offloads_fdb_tables(esw);
> - if (MLX5_CAP_GEN(esw->dev, prio_tag_required))
> - esw_prio_tag_acls_cleanup(esw);
> + esw_destroy_offloads_acl_tables(esw);
> }
>
> static void esw_functions_changed_event_handler(struct work_struct *work)
> @@ -2290,3 +2388,16 @@ struct mlx5_eswitch_rep
> *mlx5_eswitch_vport_rep(struct mlx5_eswitch *esw,
> return mlx5_eswitch_get_rep(esw, vport); }
> EXPORT_SYMBOL(mlx5_eswitch_vport_rep);
> +
> +u32 mlx5_eswitch_vport_match_metadata_enabled(struct mlx5_eswitch
> *esw)
> +{
> + return esw->flags & MLX5_ESWITCH_VPORT_MATCH_METADATA;
> +}
> +EXPORT_SYMBOL(mlx5_eswitch_vport_match_metadata_enabled);
> +
> +u32 mlx5_eswitch_get_vport_metadata_for_match(struct mlx5_eswitch *esw,
> + u16 vport)
> +{
> + return ((MLX5_CAP_GEN(esw->dev, vhca_id) & 0xffff) << 16) | vport; }
> +EXPORT_SYMBOL(mlx5_eswitch_get_vport_metadata_for_match);
> diff --git a/include/linux/mlx5/eswitch.h b/include/linux/mlx5/eswitch.h index
> 174eec0871d9..d729f5e4d70a 100644
> --- a/include/linux/mlx5/eswitch.h
> +++ b/include/linux/mlx5/eswitch.h
> @@ -64,6 +64,9 @@ struct mlx5_flow_handle *
> mlx5_eswitch_add_send_to_vport_rule(struct mlx5_eswitch *esw,
> int vport, u32 sqn);
>
> +u32 mlx5_eswitch_vport_match_metadata_enabled(struct mlx5_eswitch
> +*esw);
> +u32 mlx5_eswitch_get_vport_metadata_for_match(struct mlx5_eswitch *esw,
> +u16 vport);
> +
As you might be aware that vport_num and vport_index are not one to one map, we have few bugs in that area.
To avoid confusion to developers and users of the API, please name any new API as either vport_num or vport_index.
This makes it clear and explicit, specially global APIs like this in include directory.
> #ifdef CONFIG_MLX5_ESWITCH
> enum devlink_eswitch_encap_mode
> mlx5_eswitch_get_encap_mode(const struct mlx5_core_dev *dev);
> --
> 2.21.0
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