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net/mlx5e: Support tc block sharing for representors 

Currently offloading a rule over a tc block shared by multiple
representors fails because an e-switch global hashtable to keep
the mapping from tc cookies to mlx5e flow instances is used, and
tc block sharing offloads the same rule/cookie multiple times,
each time for different representor sharing the tc block.

Changing the implementation and behavior by acknowledging and returning
success if the same rule/cookie is offloaded again to other slave
representor sharing the tc block by setting, checking and comparing
the netdev that added the rule first.

Signed-off-by: Vu Pham <vuhuong@mellanox.com>
Reviewed-by: Parav Pandit <parav@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Reviewed-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
This commit is contained in:
Vu Pham 2019-08-02 16:13:10 -07:00 committed by Saeed Mahameed
parent 7e51891a23
commit 553f932838
1 changed files with 23 additions and 0 deletions
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23
drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
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@ -145,6 +145,7 @@ struct mlx5e_tc_flow {
struct list_head hairpin; /* flows sharing the same hairpin */
struct list_head peer; /* flows with peer flow */
struct list_head unready; /* flows not ready to be offloaded (e.g due to missing route) */
struct net_device *orig_dev; /* netdev adding flow first */
int tmp_efi_index;
struct list_head tmp_list; /* temporary flow list used by neigh update */
refcount_t refcnt;
@ -4624,11 +4625,21 @@ mlx5e_tc_add_flow(struct mlx5e_priv *priv,
return err;
}
static bool is_flow_rule_duplicate_allowed(struct net_device *dev,
struct mlx5e_rep_priv *rpriv)
{
/* Offloaded flow rule is allowed to duplicate on non-uplink representor
* sharing tc block with other slaves of a lag device.
*/
return netif_is_lag_port(dev) && rpriv->rep->vport != MLX5_VPORT_UPLINK;
}
int mlx5e_configure_flower(struct net_device *dev, struct mlx5e_priv *priv,
struct flow_cls_offload *f, unsigned long flags)
{
struct netlink_ext_ack *extack = f->common.extack;
struct rhashtable *tc_ht = get_tc_ht(priv, flags);
struct mlx5e_rep_priv *rpriv = priv->ppriv;
struct mlx5e_tc_flow *flow;
int err = 0;
@ -4636,6 +4647,12 @@ int mlx5e_configure_flower(struct net_device *dev, struct mlx5e_priv *priv,
flow = rhashtable_lookup(tc_ht, &f->cookie, tc_ht_params);
rcu_read_unlock();
if (flow) {
/* Same flow rule offloaded to non-uplink representor sharing tc block,
* just return 0.
*/
if (is_flow_rule_duplicate_allowed(dev, rpriv) && flow->orig_dev != dev)
goto out;
NL_SET_ERR_MSG_MOD(extack,
"flow cookie already exists, ignoring");
netdev_warn_once(priv->netdev,
@ -4650,6 +4667,12 @@ int mlx5e_configure_flower(struct net_device *dev, struct mlx5e_priv *priv,
if (err)
goto out;
/* Flow rule offloaded to non-uplink representor sharing tc block,
* set the flow's owner dev.
*/
if (is_flow_rule_duplicate_allowed(dev, rpriv))
flow->orig_dev = dev;
err = rhashtable_lookup_insert_fast(tc_ht, &flow->node, tc_ht_params);
if (err)
goto err_free;