diff options
Diffstat (limited to 'target/linux/lantiq/patches-5.10/0703-net-lantiq-enable-jumbo-frames-on-GSWIP.patch')
| -rw-r--r-- | target/linux/lantiq/patches-5.10/0703-net-lantiq-enable-jumbo-frames-on-GSWIP.patch | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/target/linux/lantiq/patches-5.10/0703-net-lantiq-enable-jumbo-frames-on-GSWIP.patch b/target/linux/lantiq/patches-5.10/0703-net-lantiq-enable-jumbo-frames-on-GSWIP.patch new file mode 100644 index 0000000000..9ff0baed43 --- /dev/null +++ b/target/linux/lantiq/patches-5.10/0703-net-lantiq-enable-jumbo-frames-on-GSWIP.patch @@ -0,0 +1,101 @@ +From 24a43ae2ac0ea06c474b1c80dc75651294d49321 Mon Sep 17 00:00:00 2001 +From: Thomas Nixon <tom@tomn.co.uk> +Date: Sat, 2 Oct 2021 00:48:05 +0100 +Subject: [PATCH 2/2] net: lantiq: enable jumbo frames on GSWIP + +This enables non-standard MTUs on a per-port basis, with the overall +frame size set based on the CPU port. + +When the MTU is not changed, this should have no effect. + +Long packets crash the switch with MTUs of greater than 2526, so the +maximum is limited for now. + +Signed-off-by: Thomas Nixon <tom@tomn.co.uk> +--- + drivers/net/dsa/lantiq_gswip.c | 46 +++++++++++++++++++++++++++++++--- + 1 file changed, 42 insertions(+), 4 deletions(-) + +--- a/drivers/net/dsa/lantiq_gswip.c ++++ b/drivers/net/dsa/lantiq_gswip.c +@@ -238,6 +238,11 @@ + + #define XRX200_GPHY_FW_ALIGN (16 * 1024) + ++/* maximum packet size supported by the switch; in theory this should be 9600, ++ * but long packets currently cause lock-ups with an MTU of over 2526 ++ */ ++#define GSWIP_MAX_PACKET_LENGTH 2556 ++ + struct gswip_hw_info { + int max_ports; + int cpu_port; +@@ -851,10 +856,6 @@ static int gswip_setup(struct dsa_switch + gswip_switch_mask(priv, 0, GSWIP_PCE_PCTRL_0_INGRESS, + GSWIP_PCE_PCTRL_0p(cpu_port)); + +- gswip_switch_mask(priv, 0, GSWIP_MAC_CTRL_2_MLEN, +- GSWIP_MAC_CTRL_2p(cpu_port)); +- gswip_switch_w(priv, VLAN_ETH_FRAME_LEN + 8 + ETH_FCS_LEN, +- GSWIP_MAC_FLEN); + gswip_switch_mask(priv, 0, GSWIP_BM_QUEUE_GCTRL_GL_MOD, + GSWIP_BM_QUEUE_GCTRL); + +@@ -871,6 +872,8 @@ static int gswip_setup(struct dsa_switch + return err; + } + ++ ds->mtu_enforcement_ingress = true; ++ + gswip_port_enable(ds, cpu_port, NULL); + return 0; + } +@@ -1433,6 +1436,39 @@ static int gswip_port_fdb_dump(struct ds + return 0; + } + ++static int gswip_port_max_mtu(struct dsa_switch *ds, int port) ++{ ++ /* includes 8 bytes for special header */ ++ return GSWIP_MAX_PACKET_LENGTH - VLAN_ETH_HLEN - ETH_FCS_LEN; ++} ++ ++static int gswip_port_change_mtu(struct dsa_switch *ds, int port, int new_mtu) ++{ ++ struct gswip_priv *priv = ds->priv; ++ int cpu_port = priv->hw_info->cpu_port; ++ ++ /* cpu port always has maximum mtu of user ports, so use it to set ++ * switch frame size, including 8 byte special header ++ */ ++ if (port == cpu_port) { ++ new_mtu += 8; ++ gswip_switch_w(priv, VLAN_ETH_HLEN + new_mtu + ETH_FCS_LEN, ++ GSWIP_MAC_FLEN); ++ } ++ ++ /* enable MLEN for ports with non-standard MTUs, including the special ++ * header on the CPU port added above ++ */ ++ if (new_mtu != ETH_DATA_LEN) ++ gswip_switch_mask(priv, 0, GSWIP_MAC_CTRL_2_MLEN, ++ GSWIP_MAC_CTRL_2p(port)); ++ else ++ gswip_switch_mask(priv, GSWIP_MAC_CTRL_2_MLEN, 0, ++ GSWIP_MAC_CTRL_2p(port)); ++ ++ return 0; ++} ++ + static void gswip_phylink_validate(struct dsa_switch *ds, int port, + unsigned long *supported, + struct phylink_link_state *state) +@@ -1776,6 +1812,8 @@ static const struct dsa_switch_ops gswip + .port_fdb_add = gswip_port_fdb_add, + .port_fdb_del = gswip_port_fdb_del, + .port_fdb_dump = gswip_port_fdb_dump, ++ .port_change_mtu = gswip_port_change_mtu, ++ .port_max_mtu = gswip_port_max_mtu, + .phylink_validate = gswip_phylink_validate, + .phylink_mac_config = gswip_phylink_mac_config, + .phylink_mac_link_down = gswip_phylink_mac_link_down, |