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Date: Wed, 17 Oct 2018 17:08:58 -0700
From: Saeed Mahameed <saeedm@...lanox.com>
To: "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Cc: Paul Blakey <paulb@...lanox.com>,
Saeed Mahameed <saeedm@...lanox.com>
Subject: [net-next 13/14] net/mlx5e: Use a slow path rule instead if vxlan neighbour isn't available
From: Paul Blakey <paulb@...lanox.com>
When adding a vxlan tc rule, and a neighbour isn't available, we
don't insert any rule to hardware. Once we enable offloading flows
with multiple priorities, a packet that should have matched this rule
will continue in hardware pipeline and might match a wrong one.
This is unlike in tc software path where it will be matched and
forwarded to the vxlan device (which will cause a ARP lookup
eventually) and stop processing further tc filters.
To address that, when when a neighbour isn't available (EAGAIN from
attach_encap), or gets deleted, change the original action to be a
forward to slow path instead. Neighbour update will restore the original
action once the neighbour becomes available. This will be done atomically
so at any given time we will have a the correct match.
Signed-off-by: Paul Blakey <paulb@...lanox.com>
Reviewed-by: Or Gerlitz <ogerlitz@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
---
.../net/ethernet/mellanox/mlx5/core/en_tc.c | 104 ++++++++++++++----
1 file changed, 82 insertions(+), 22 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index 1786e25644ac..cb66964aa1ff 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -74,6 +74,7 @@ enum {
MLX5E_TC_FLOW_OFFLOADED = BIT(MLX5E_TC_FLOW_BASE + 2),
MLX5E_TC_FLOW_HAIRPIN = BIT(MLX5E_TC_FLOW_BASE + 3),
MLX5E_TC_FLOW_HAIRPIN_RSS = BIT(MLX5E_TC_FLOW_BASE + 4),
+ MLX5E_TC_FLOW_SLOW = BIT(MLX5E_TC_FLOW_BASE + 5),
};
#define MLX5E_TC_MAX_SPLITS 1
@@ -82,7 +83,7 @@ struct mlx5e_tc_flow {
struct rhash_head node;
struct mlx5e_priv *priv;
u64 cookie;
- u8 flags;
+ u16 flags;
struct mlx5_flow_handle *rule[MLX5E_TC_MAX_SPLITS + 1];
struct list_head encap; /* flows sharing the same encap ID */
struct list_head mod_hdr; /* flows sharing the same mod hdr ID */
@@ -860,6 +861,36 @@ mlx5e_tc_unoffload_fdb_rules(struct mlx5_eswitch *esw,
mlx5_eswitch_del_offloaded_rule(esw, flow->rule[0], attr);
}
+static struct mlx5_flow_handle *
+mlx5e_tc_offload_to_slow_path(struct mlx5_eswitch *esw,
+ struct mlx5e_tc_flow *flow,
+ struct mlx5_flow_spec *spec,
+ struct mlx5_esw_flow_attr *slow_attr)
+{
+ struct mlx5_flow_handle *rule;
+
+ memcpy(slow_attr, flow->esw_attr, sizeof(*slow_attr));
+ slow_attr->action = MLX5_FLOW_CONTEXT_ACTION_FWD_DEST,
+ slow_attr->mirror_count = 0,
+ slow_attr->dest_chain = FDB_SLOW_PATH_CHAIN,
+
+ rule = mlx5e_tc_offload_fdb_rules(esw, flow, spec, slow_attr);
+ if (!IS_ERR(rule))
+ flow->flags |= MLX5E_TC_FLOW_SLOW;
+
+ return rule;
+}
+
+static void
+mlx5e_tc_unoffload_from_slow_path(struct mlx5_eswitch *esw,
+ struct mlx5e_tc_flow *flow,
+ struct mlx5_esw_flow_attr *slow_attr)
+{
+ memcpy(slow_attr, flow->esw_attr, sizeof(*slow_attr));
+ mlx5e_tc_unoffload_fdb_rules(esw, flow, slow_attr);
+ flow->flags &= ~MLX5E_TC_FLOW_SLOW;
+}
+
static int
mlx5e_tc_add_fdb_flow(struct mlx5e_priv *priv,
struct mlx5e_tc_flow_parse_attr *parse_attr,
@@ -917,15 +948,21 @@ mlx5e_tc_add_fdb_flow(struct mlx5e_priv *priv,
/* we get here if (1) there's no error or when
* (2) there's an encap action and we're on -EAGAIN (no valid neigh)
*/
- if (encap_err != -EAGAIN) {
+ if (encap_err == -EAGAIN) {
+ /* continue with goto slow path rule instead */
+ struct mlx5_esw_flow_attr slow_attr;
+
+ flow->rule[0] = mlx5e_tc_offload_to_slow_path(esw, flow, &parse_attr->spec, &slow_attr);
+ } else {
flow->rule[0] = mlx5e_tc_offload_fdb_rules(esw, flow, &parse_attr->spec, attr);
- if (IS_ERR(flow->rule[0])) {
- err = PTR_ERR(flow->rule[0]);
- goto err_add_rule;
- }
}
- return encap_err;
+ if (IS_ERR(flow->rule[0])) {
+ err = PTR_ERR(flow->rule[0]);
+ goto err_add_rule;
+ }
+
+ return 0;
err_add_rule:
mlx5_fc_destroy(esw->dev, counter);
@@ -946,9 +983,14 @@ static void mlx5e_tc_del_fdb_flow(struct mlx5e_priv *priv,
{
struct mlx5_eswitch *esw = priv->mdev->priv.eswitch;
struct mlx5_esw_flow_attr *attr = flow->esw_attr;
+ struct mlx5_esw_flow_attr slow_attr;
- if (flow->flags & MLX5E_TC_FLOW_OFFLOADED)
- mlx5e_tc_unoffload_fdb_rules(esw, flow, flow->esw_attr);
+ if (flow->flags & MLX5E_TC_FLOW_OFFLOADED) {
+ if (flow->flags & MLX5E_TC_FLOW_SLOW)
+ mlx5e_tc_unoffload_from_slow_path(esw, flow, &slow_attr);
+ else
+ mlx5e_tc_unoffload_fdb_rules(esw, flow, attr);
+ }
mlx5_eswitch_del_vlan_action(esw, attr);
@@ -968,7 +1010,7 @@ void mlx5e_tc_encap_flows_add(struct mlx5e_priv *priv,
struct mlx5e_encap_entry *e)
{
struct mlx5_eswitch *esw = priv->mdev->priv.eswitch;
- struct mlx5_esw_flow_attr *esw_attr;
+ struct mlx5_esw_flow_attr slow_attr, *esw_attr;
struct mlx5_flow_handle *rule;
struct mlx5_flow_spec *spec;
struct mlx5e_tc_flow *flow;
@@ -991,6 +1033,7 @@ void mlx5e_tc_encap_flows_add(struct mlx5e_priv *priv,
esw_attr->encap_id = e->encap_id;
spec = &esw_attr->parse_attr->spec;
+ /* update from slow path rule to encap rule */
rule = mlx5e_tc_offload_fdb_rules(esw, flow, spec, esw_attr);
if (IS_ERR(rule)) {
err = PTR_ERR(rule);
@@ -998,6 +1041,9 @@ void mlx5e_tc_encap_flows_add(struct mlx5e_priv *priv,
err);
continue;
}
+
+ mlx5e_tc_unoffload_from_slow_path(esw, flow, &slow_attr);
+ flow->flags |= MLX5E_TC_FLOW_OFFLOADED; /* was unset when slow path rule removed */
flow->rule[0] = rule;
}
}
@@ -1006,11 +1052,28 @@ void mlx5e_tc_encap_flows_del(struct mlx5e_priv *priv,
struct mlx5e_encap_entry *e)
{
struct mlx5_eswitch *esw = priv->mdev->priv.eswitch;
+ struct mlx5_esw_flow_attr slow_attr;
+ struct mlx5_flow_handle *rule;
+ struct mlx5_flow_spec *spec;
struct mlx5e_tc_flow *flow;
+ int err;
list_for_each_entry(flow, &e->flows, encap) {
- if (flow->flags & MLX5E_TC_FLOW_OFFLOADED)
- mlx5e_tc_unoffload_fdb_rules(esw, flow, flow->esw_attr);
+ spec = &flow->esw_attr->parse_attr->spec;
+
+ /* update from encap rule to slow path rule */
+ rule = mlx5e_tc_offload_to_slow_path(esw, flow, spec, &slow_attr);
+
+ if (IS_ERR(rule)) {
+ err = PTR_ERR(rule);
+ mlx5_core_warn(priv->mdev, "Failed to update slow path (encap) flow, %d\n",
+ err);
+ continue;
+ }
+
+ mlx5e_tc_unoffload_fdb_rules(esw, flow, flow->esw_attr);
+ flow->flags |= MLX5E_TC_FLOW_OFFLOADED; /* was unset when fast path rule removed */
+ flow->rule[0] = rule;
}
if (e->flags & MLX5_ENCAP_ENTRY_VALID) {
@@ -2888,9 +2951,9 @@ static int parse_tc_fdb_actions(struct mlx5e_priv *priv, struct tcf_exts *exts,
return 0;
}
-static void get_flags(int flags, u8 *flow_flags)
+static void get_flags(int flags, u16 *flow_flags)
{
- u8 __flow_flags = 0;
+ u16 __flow_flags = 0;
if (flags & MLX5E_TC_INGRESS)
__flow_flags |= MLX5E_TC_FLOW_INGRESS;
@@ -2921,7 +2984,7 @@ static struct rhashtable *get_tc_ht(struct mlx5e_priv *priv)
static int
mlx5e_alloc_flow(struct mlx5e_priv *priv, int attr_size,
- struct tc_cls_flower_offload *f, u8 flow_flags,
+ struct tc_cls_flower_offload *f, u16 flow_flags,
struct mlx5e_tc_flow_parse_attr **__parse_attr,
struct mlx5e_tc_flow **__flow)
{
@@ -2958,7 +3021,7 @@ mlx5e_alloc_flow(struct mlx5e_priv *priv, int attr_size,
static int
mlx5e_add_fdb_flow(struct mlx5e_priv *priv,
struct tc_cls_flower_offload *f,
- u8 flow_flags,
+ u16 flow_flags,
struct mlx5e_tc_flow **__flow)
{
struct netlink_ext_ack *extack = f->common.extack;
@@ -2978,12 +3041,9 @@ mlx5e_add_fdb_flow(struct mlx5e_priv *priv,
goto err_free;
err = mlx5e_tc_add_fdb_flow(priv, parse_attr, flow, extack);
- if (err && err != -EAGAIN)
+ if (err)
goto err_free;
- if (!err)
- flow->flags |= MLX5E_TC_FLOW_OFFLOADED;
-
if (!(flow->esw_attr->action &
MLX5_FLOW_CONTEXT_ACTION_PACKET_REFORMAT))
kvfree(parse_attr);
@@ -3002,7 +3062,7 @@ mlx5e_add_fdb_flow(struct mlx5e_priv *priv,
static int
mlx5e_add_nic_flow(struct mlx5e_priv *priv,
struct tc_cls_flower_offload *f,
- u8 flow_flags,
+ u16 flow_flags,
struct mlx5e_tc_flow **__flow)
{
struct netlink_ext_ack *extack = f->common.extack;
@@ -3045,7 +3105,7 @@ mlx5e_tc_add_flow(struct mlx5e_priv *priv,
struct mlx5e_tc_flow **flow)
{
struct mlx5_eswitch *esw = priv->mdev->priv.eswitch;
- u8 flow_flags;
+ u16 flow_flags;
int err;
get_flags(flags, &flow_flags);
--
2.17.2
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