[PATCH net-next v6 4/8] net: microchip: sparx5: Adding TC goto action and action checking
Steen Hegelund
steen.hegelund at microchip.com
Wed Nov 9 03:41:12 PST 2022
Add support for a goto action and ensure that a HW offloaded TC flower
filter has a valid goto action and that pass and trap actions are not both
used in the same filter.
Signed-off-by: Steen Hegelund <steen.hegelund at microchip.com>
---
.../microchip/sparx5/sparx5_tc_flower.c | 70 ++++++++++++++++---
.../net/ethernet/microchip/vcap/vcap_api.c | 36 ++++++++++
.../ethernet/microchip/vcap/vcap_api_client.h | 2 +
3 files changed, 100 insertions(+), 8 deletions(-)
diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_tc_flower.c b/drivers/net/ethernet/microchip/sparx5/sparx5_tc_flower.c
index 13bc6bff4c1e..6cd29d3c9250 100644
--- a/drivers/net/ethernet/microchip/sparx5/sparx5_tc_flower.c
+++ b/drivers/net/ethernet/microchip/sparx5/sparx5_tc_flower.c
@@ -464,6 +464,60 @@ static int sparx5_tc_use_dissectors(struct flow_cls_offload *fco,
return err;
}
+static int sparx5_tc_flower_action_check(struct vcap_control *vctrl,
+ struct flow_cls_offload *fco,
+ struct vcap_admin *admin)
+{
+ struct flow_rule *rule = flow_cls_offload_flow_rule(fco);
+ struct flow_action_entry *actent, *last_actent = NULL;
+ struct flow_action *act = &rule->action;
+ u64 action_mask = 0;
+ int idx;
+
+ if (!flow_action_has_entries(act)) {
+ NL_SET_ERR_MSG_MOD(fco->common.extack, "No actions");
+ return -EINVAL;
+ }
+
+ if (!flow_action_basic_hw_stats_check(act, fco->common.extack))
+ return -EOPNOTSUPP;
+
+ flow_action_for_each(idx, actent, act) {
+ if (action_mask & BIT(actent->id)) {
+ NL_SET_ERR_MSG_MOD(fco->common.extack,
+ "More actions of the same type");
+ return -EINVAL;
+ }
+ action_mask |= BIT(actent->id);
+ last_actent = actent; /* Save last action for later check */
+ }
+
+ /* Check that last action is a goto */
+ if (last_actent->id != FLOW_ACTION_GOTO) {
+ NL_SET_ERR_MSG_MOD(fco->common.extack,
+ "Last action must be 'goto'");
+ return -EINVAL;
+ }
+
+ /* Check if the goto chain is in the next lookup */
+ if (!vcap_is_next_lookup(vctrl, fco->common.chain_index,
+ last_actent->chain_index)) {
+ NL_SET_ERR_MSG_MOD(fco->common.extack,
+ "Invalid goto chain");
+ return -EINVAL;
+ }
+
+ /* Catch unsupported combinations of actions */
+ if (action_mask & BIT(FLOW_ACTION_TRAP) &&
+ action_mask & BIT(FLOW_ACTION_ACCEPT)) {
+ NL_SET_ERR_MSG_MOD(fco->common.extack,
+ "Cannot combine pass and trap action");
+ return -EOPNOTSUPP;
+ }
+
+ return 0;
+}
+
static int sparx5_tc_flower_replace(struct net_device *ndev,
struct flow_cls_offload *fco,
struct vcap_admin *admin)
@@ -475,16 +529,12 @@ static int sparx5_tc_flower_replace(struct net_device *ndev,
struct vcap_rule *vrule;
int err, idx;
- frule = flow_cls_offload_flow_rule(fco);
- if (!flow_action_has_entries(&frule->action)) {
- NL_SET_ERR_MSG_MOD(fco->common.extack, "No actions");
- return -EINVAL;
- }
+ vctrl = port->sparx5->vcap_ctrl;
- if (!flow_action_basic_hw_stats_check(&frule->action, fco->common.extack))
- return -EOPNOTSUPP;
+ err = sparx5_tc_flower_action_check(vctrl, fco, admin);
+ if (err)
+ return err;
- vctrl = port->sparx5->vcap_ctrl;
vrule = vcap_alloc_rule(vctrl, ndev, fco->common.chain_index, VCAP_USER_TC,
fco->common.prio, 0);
if (IS_ERR(vrule))
@@ -492,6 +542,7 @@ static int sparx5_tc_flower_replace(struct net_device *ndev,
vrule->cookie = fco->cookie;
sparx5_tc_use_dissectors(fco, admin, vrule);
+ frule = flow_cls_offload_flow_rule(fco);
flow_action_for_each(idx, act, &frule->action) {
switch (act->id) {
case FLOW_ACTION_TRAP:
@@ -521,6 +572,9 @@ static int sparx5_tc_flower_replace(struct net_device *ndev,
if (err)
goto out;
break;
+ case FLOW_ACTION_GOTO:
+ /* Links between VCAPs will be added later */
+ break;
default:
NL_SET_ERR_MSG_MOD(fco->common.extack,
"Unsupported TC action");
diff --git a/drivers/net/ethernet/microchip/vcap/vcap_api.c b/drivers/net/ethernet/microchip/vcap/vcap_api.c
index d5b62e43d83f..0dd9637933b2 100644
--- a/drivers/net/ethernet/microchip/vcap/vcap_api.c
+++ b/drivers/net/ethernet/microchip/vcap/vcap_api.c
@@ -677,6 +677,42 @@ struct vcap_admin *vcap_find_admin(struct vcap_control *vctrl, int cid)
}
EXPORT_SYMBOL_GPL(vcap_find_admin);
+/* Is the next chain id in the following lookup, possible in another VCAP */
+bool vcap_is_next_lookup(struct vcap_control *vctrl, int cur_cid, int next_cid)
+{
+ struct vcap_admin *admin, *next_admin;
+ int lookup, next_lookup;
+
+ /* The offset must be at least one lookup */
+ if (next_cid < cur_cid + VCAP_CID_LOOKUP_SIZE)
+ return false;
+
+ if (vcap_api_check(vctrl))
+ return false;
+
+ admin = vcap_find_admin(vctrl, cur_cid);
+ if (!admin)
+ return false;
+
+ /* If no VCAP contains the next chain, the next chain must be beyond
+ * the last chain in the current VCAP
+ */
+ next_admin = vcap_find_admin(vctrl, next_cid);
+ if (!next_admin)
+ return next_cid > admin->last_cid;
+
+ lookup = vcap_chain_id_to_lookup(admin, cur_cid);
+ next_lookup = vcap_chain_id_to_lookup(next_admin, next_cid);
+
+ /* Next lookup must be the following lookup */
+ if (admin == next_admin || admin->vtype == next_admin->vtype)
+ return next_lookup == lookup + 1;
+
+ /* Must be the first lookup in the next VCAP instance */
+ return next_lookup == 0;
+}
+EXPORT_SYMBOL_GPL(vcap_is_next_lookup);
+
/* Check if there is room for a new rule */
static int vcap_rule_space(struct vcap_admin *admin, int size)
{
diff --git a/drivers/net/ethernet/microchip/vcap/vcap_api_client.h b/drivers/net/ethernet/microchip/vcap/vcap_api_client.h
index 7d9a227ef834..5cecb12edec2 100644
--- a/drivers/net/ethernet/microchip/vcap/vcap_api_client.h
+++ b/drivers/net/ethernet/microchip/vcap/vcap_api_client.h
@@ -193,6 +193,8 @@ const struct vcap_field *vcap_lookup_keyfield(struct vcap_rule *rule,
enum vcap_key_field key);
/* Find a rule id with a provided cookie */
int vcap_lookup_rule_by_cookie(struct vcap_control *vctrl, u64 cookie);
+/* Is the next chain id in the following lookup, possible in another VCAP */
+bool vcap_is_next_lookup(struct vcap_control *vctrl, int cur_cid, int next_cid);
/* Copy to host byte order */
void vcap_netbytes_copy(u8 *dst, u8 *src, int count);
--
2.38.1
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