diff options
Diffstat (limited to 'target/linux/layerscape/patches-5.4/701-net-0258-net-mscc-ocelot-adjust-MTU-on-the-CPU-port-in-NPI-mo.patch')
| -rw-r--r-- | target/linux/layerscape/patches-5.4/701-net-0258-net-mscc-ocelot-adjust-MTU-on-the-CPU-port-in-NPI-mo.patch | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/target/linux/layerscape/patches-5.4/701-net-0258-net-mscc-ocelot-adjust-MTU-on-the-CPU-port-in-NPI-mo.patch b/target/linux/layerscape/patches-5.4/701-net-0258-net-mscc-ocelot-adjust-MTU-on-the-CPU-port-in-NPI-mo.patch new file mode 100644 index 0000000000..9adc0ffff5 --- /dev/null +++ b/target/linux/layerscape/patches-5.4/701-net-0258-net-mscc-ocelot-adjust-MTU-on-the-CPU-port-in-NPI-mo.patch @@ -0,0 +1,54 @@ +From b2f7c18c351737c2a053c39c09ef50870fd78c06 Mon Sep 17 00:00:00 2001 +From: Vladimir Oltean <vladimir.oltean@nxp.com> +Date: Thu, 14 Nov 2019 17:03:25 +0200 +Subject: [PATCH] net: mscc: ocelot: adjust MTU on the CPU port in NPI mode + +When using the NPI port, the DSA tag is passed through Ethernet, so the +switch's MAC needs to accept it as it comes from the DSA master. Increase +the MTU on the external CPU port to account for the length of the +injection header. + +Without this patch, MTU-sized frames are dropped by the switch's CPU +port on xmit, which is especially obvious in TCP sessions. + +Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> +Reviewed-by: Andrew Lunn <andrew@lunn.ch> +Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> +Signed-off-by: David S. Miller <davem@davemloft.net> +--- + drivers/net/ethernet/mscc/ocelot.c | 9 +++++++++ + drivers/net/ethernet/mscc/ocelot.h | 2 ++ + 2 files changed, 11 insertions(+) + +--- a/drivers/net/ethernet/mscc/ocelot.c ++++ b/drivers/net/ethernet/mscc/ocelot.c +@@ -2234,9 +2234,18 @@ void ocelot_set_cpu_port(struct ocelot * + * Only one port can be an NPI at the same time. + */ + if (cpu < ocelot->num_phys_ports) { ++ int mtu = VLAN_ETH_FRAME_LEN + OCELOT_TAG_LEN; ++ + ocelot_write(ocelot, QSYS_EXT_CPU_CFG_EXT_CPUQ_MSK_M | + QSYS_EXT_CPU_CFG_EXT_CPU_PORT(cpu), + QSYS_EXT_CPU_CFG); ++ ++ if (injection == OCELOT_TAG_PREFIX_SHORT) ++ mtu += OCELOT_SHORT_PREFIX_LEN; ++ else if (injection == OCELOT_TAG_PREFIX_LONG) ++ mtu += OCELOT_LONG_PREFIX_LEN; ++ ++ ocelot_port_set_mtu(ocelot, cpu, mtu); + } + + /* CPU port Injection/Extraction configuration */ +--- a/drivers/net/ethernet/mscc/ocelot.h ++++ b/drivers/net/ethernet/mscc/ocelot.h +@@ -65,6 +65,8 @@ struct frame_info { + #define IFH_REW_OP_ORIGIN_PTP 0x5 + + #define OCELOT_TAG_LEN 16 ++#define OCELOT_SHORT_PREFIX_LEN 4 ++#define OCELOT_LONG_PREFIX_LEN 16 + + #define OCELOT_SPEED_2500 0 + #define OCELOT_SPEED_1000 1 |