[PATCH 17/20] net: dsa: xilinx: opt into TX forwarding offload on bridge join
flat view
COLD60d
From: Nagadheeraj Rottela <hidden>
Date: 2026-08-07 10:46:37
Also in:
linux-arm-kernel, linux-devicetree, lkml
Subsystem:
networking drivers, networking [dsa], the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Andrew Lunn, Vladimir Oltean, Linus Torvalds
Set *tx_fwd_offload in port_bridge_join. The bridge then sends one copy via the offloaded TX path and the fabric handles per-port replication. The fabric offloads a single bridge across the user ports. Set ds->max_num_bridges to 1 so the DSA core rejects a second bridge instead of silently merging the ports. Signed-off-by: Nagadheeraj Rottela <redacted> --- drivers/net/dsa/xilinx/xilinx_tsn.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+)
diff --git a/drivers/net/dsa/xilinx/xilinx_tsn.c b/drivers/net/dsa/xilinx/xilinx_tsn.c
index e48c81f18d6e..9a4d4a2fb892 100644
--- a/drivers/net/dsa/xilinx/xilinx_tsn.c
+++ b/drivers/net/dsa/xilinx/xilinx_tsn.c@@ -495,6 +495,19 @@ static int xlnx_tsn_port_set_mac_address(struct dsa_switch *ds, int port, return 0; } +static int xlnx_tsn_port_bridge_join(struct dsa_switch *ds, int port, + struct dsa_bridge bridge, + bool *tx_fwd_offload, + struct netlink_ext_ack *extack) +{ + /* The switch fabric replicates flooded frames per egress port + * on its own, so the bridge does not need to clone-and-send. + */ + *tx_fwd_offload = true; + + return 0; +} + static void xlnx_tsn_port_stp_state_set(struct dsa_switch *ds, int port, u8 state) {
@@ -729,6 +742,7 @@ static const struct dsa_switch_ops xlnx_tsn_switch_ops = { .setup = xlnx_tsn_setup, .teardown = xlnx_tsn_teardown, .port_set_mac_address = xlnx_tsn_port_set_mac_address, + .port_bridge_join = xlnx_tsn_port_bridge_join, .port_stp_state_set = xlnx_tsn_port_stp_state_set, .port_hwtstamp_get = xlnx_tsn_port_hwtstamp_get, .port_hwtstamp_set = xlnx_tsn_port_hwtstamp_set,
@@ -786,6 +800,9 @@ static int xlnx_tsn_probe(struct platform_device *pdev) ds->phylink_mac_ops = &xlnx_tsn_phylink_mac_ops; ds->priv = sw; + /* The fabric offloads a single bridge across the user ports. */ + ds->max_num_bridges = 1; + platform_set_drvdata(pdev, sw); return dsa_register_switch(ds);
--
2.34.1