[PATCH net-next v2 4/5] net: sparx5: add the tc glue to support port mirroring

From: Daniel Machon
Date: Thu Apr 18 2024 - 12:58:04 EST


Add the necessary tc glue to add and delete mirror rules through tc
matchall.

Signed-off-by: Daniel Machon <daniel.machon@xxxxxxxxxxxxx>
Reviewed-by: Steen Hegelund <Steen.Hegelund@xxxxxxxxxxxxx>
---
.../ethernet/microchip/sparx5/sparx5_tc_matchall.c | 38 ++++++++++++++++++++--
1 file changed, 36 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_tc_matchall.c b/drivers/net/ethernet/microchip/sparx5/sparx5_tc_matchall.c
index 2a33b347098f..4f9ae026fa47 100644
--- a/drivers/net/ethernet/microchip/sparx5/sparx5_tc_matchall.c
+++ b/drivers/net/ethernet/microchip/sparx5/sparx5_tc_matchall.c
@@ -36,6 +36,13 @@ static void sparx5_tc_matchall_parse_action(struct sparx5_port *port,
entry->cookie = cookie;
}

+static void
+sparx5_tc_matchall_parse_mirror_action(struct sparx5_mall_entry *entry,
+ struct flow_action_entry *action)
+{
+ entry->mirror.port = netdev_priv(action->dev);
+}
+
static int sparx5_tc_matchall_replace(struct net_device *ndev,
struct tc_cls_matchall_offload *tmo,
bool ingress)
@@ -65,6 +72,31 @@ static int sparx5_tc_matchall_replace(struct net_device *ndev,

sparx5 = port->sparx5;
switch (action->id) {
+ case FLOW_ACTION_MIRRED:
+ sparx5_tc_matchall_parse_mirror_action(mall_entry, action);
+ err = sparx5_mirror_add(mall_entry);
+ if (err) {
+ switch (err) {
+ case -EEXIST:
+ NL_SET_ERR_MSG_MOD(tmo->common.extack,
+ "Mirroring already exists");
+ break;
+ case -EINVAL:
+ NL_SET_ERR_MSG_MOD(tmo->common.extack,
+ "Cannot mirror a monitor port");
+ break;
+ case -ENOENT:
+ NL_SET_ERR_MSG_MOD(tmo->common.extack,
+ "No more mirror probes available");
+ break;
+ default:
+ NL_SET_ERR_MSG_MOD(tmo->common.extack,
+ "Unknown error");
+ break;
+ }
+ return err;
+ }
+ break;
case FLOW_ACTION_GOTO:
err = vcap_enable_lookups(sparx5->vcap_ctrl, ndev,
tmo->common.chain_index,
@@ -108,14 +140,16 @@ static int sparx5_tc_matchall_destroy(struct net_device *ndev,
struct sparx5_port *port = netdev_priv(ndev);
struct sparx5 *sparx5 = port->sparx5;
struct sparx5_mall_entry *entry;
- int err;
+ int err = 0;

entry = sparx5_tc_matchall_entry_find(&sparx5->mall_entries,
tmo->cookie);
if (!entry)
return -ENOENT;

- if (entry->type == FLOW_ACTION_GOTO) {
+ if (entry->type == FLOW_ACTION_MIRRED) {
+ sparx5_mirror_del(entry);
+ } else if (entry->type == FLOW_ACTION_GOTO) {
err = vcap_enable_lookups(sparx5->vcap_ctrl, ndev,
0, 0, tmo->cookie, false);
} else {

--
2.34.1