[PATCH v3 net-next 08/10] net: netdevsim: mimic tc-taprio offload

Vladimir Oltean
2023-08-01T18:25:36Z

To be able to use netdevsim for tc-testing with an offloaded tc-taprio
schedule, it needs to report a PTP clock (which it now does), and to
accept ndo_setup_tc(TC_SETUP_QDISC_TAPRIO) calls.

Since netdevsim has no packet I/O, this doesn't do anything intelligent,
it only allows taprio offload code paths to go through some level of
automated testing.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
---
v2->v3: none
v1->v2: patch is new

drivers/net/netdevsim/netdev.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)

diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c
index 2a4a0c4065cf..2eac92f49631 100644
--- a/drivers/net/netdevsim/netdev.c
+++ b/drivers/net/netdevsim/netdev.c
@@ -209,6 +209,31 @@ static int nsim_set_vf_link_state(struct net_device *dev, int vf, int state)
return 0;
}

+static void nsim_taprio_stats(struct tc_taprio_qopt_stats *stats)
+{
+ stats->window_drops = 0;
+ stats->tx_overruns = 0;
+}
+
+static int nsim_setup_tc_taprio(struct net_device *dev,
+ struct tc_taprio_qopt_offload *offload)
+{
+ int err = 0;
+
+ switch (offload->cmd) {
+ case TAPRIO_CMD_REPLACE:
+ case TAPRIO_CMD_DESTROY:
+ break;
+ case TAPRIO_CMD_STATS:
+ nsim_taprio_stats(&offload->stats);
+ break;
+ default:
+ err = -EOPNOTSUPP;
+ }
+
+ return err;
+}
+
static LIST_HEAD(nsim_block_cb_list);

static int
@@ -217,6 +242,8 @@ nsim_setup_tc(struct net_device *dev, enum tc_setup_type type, void *type_data)
struct netdevsim *ns = netdev_priv(dev);

switch (type) {
+ case TC_SETUP_QDISC_TAPRIO:
+ return nsim_setup_tc_taprio(dev, type_data);
case TC_SETUP_BLOCK:
return flow_block_cb_setup_simple(type_data,
&nsim_block_cb_list,
--
2.34.1