diff options
Diffstat (limited to 'target/linux/layerscape/patches-5.4/701-net-0256-net-mscc-ocelot-create-a-helper-for-changing-the-por.patch')
| -rw-r--r-- | target/linux/layerscape/patches-5.4/701-net-0256-net-mscc-ocelot-create-a-helper-for-changing-the-por.patch | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/target/linux/layerscape/patches-5.4/701-net-0256-net-mscc-ocelot-create-a-helper-for-changing-the-por.patch b/target/linux/layerscape/patches-5.4/701-net-0256-net-mscc-ocelot-create-a-helper-for-changing-the-por.patch new file mode 100644 index 0000000000..1aefe3436f --- /dev/null +++ b/target/linux/layerscape/patches-5.4/701-net-0256-net-mscc-ocelot-create-a-helper-for-changing-the-por.patch @@ -0,0 +1,87 @@ +From e870793b277eeaf3c455971d9610f039fd9ab160 Mon Sep 17 00:00:00 2001 +From: Vladimir Oltean <vladimir.oltean@nxp.com> +Date: Thu, 14 Nov 2019 17:03:23 +0200 +Subject: [PATCH] net: mscc: ocelot: create a helper for changing the port MTU + +Since in an NPI/DSA setup, not all ports will have the same MTU, we need +to make sure the watermarks for pause frames and/or tail dropping logic +that existed in the driver is still coherent for the new MTU values. + +We need to do this because the NPI (aka external CPU) port needs an +increased MTU for the DSA tag. This will be done in a future patch. + +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 | 40 ++++++++++++++++++++++---------------- + 1 file changed, 23 insertions(+), 17 deletions(-) + +--- a/drivers/net/ethernet/mscc/ocelot.c ++++ b/drivers/net/ethernet/mscc/ocelot.c +@@ -2101,11 +2101,32 @@ static int ocelot_init_timestamp(struct + return 0; + } + +-static void ocelot_init_port(struct ocelot *ocelot, int port) ++static void ocelot_port_set_mtu(struct ocelot *ocelot, int port, size_t mtu) + { + struct ocelot_port *ocelot_port = ocelot->ports[port]; + int atop_wm; + ++ ocelot_port_writel(ocelot_port, mtu, DEV_MAC_MAXLEN_CFG); ++ ++ /* Set Pause WM hysteresis ++ * 152 = 6 * mtu / OCELOT_BUFFER_CELL_SZ ++ * 101 = 4 * mtu / OCELOT_BUFFER_CELL_SZ ++ */ ++ ocelot_write_rix(ocelot, SYS_PAUSE_CFG_PAUSE_ENA | ++ SYS_PAUSE_CFG_PAUSE_STOP(101) | ++ SYS_PAUSE_CFG_PAUSE_START(152), SYS_PAUSE_CFG, port); ++ ++ /* Tail dropping watermark */ ++ atop_wm = (ocelot->shared_queue_sz - 9 * mtu) / OCELOT_BUFFER_CELL_SZ; ++ ocelot_write_rix(ocelot, ocelot_wm_enc(9 * mtu), ++ SYS_ATOP, port); ++ ocelot_write(ocelot, ocelot_wm_enc(atop_wm), SYS_ATOP_TOT_CFG); ++} ++ ++static void ocelot_init_port(struct ocelot *ocelot, int port) ++{ ++ struct ocelot_port *ocelot_port = ocelot->ports[port]; ++ + INIT_LIST_HEAD(&ocelot_port->skbs); + + /* Basic L2 initialization */ +@@ -2126,8 +2147,7 @@ static void ocelot_init_port(struct ocel + DEV_MAC_HDX_CFG); + + /* Set Max Length and maximum tags allowed */ +- ocelot_port_writel(ocelot_port, VLAN_ETH_FRAME_LEN, +- DEV_MAC_MAXLEN_CFG); ++ ocelot_port_set_mtu(ocelot, port, VLAN_ETH_FRAME_LEN); + ocelot_port_writel(ocelot_port, DEV_MAC_TAGS_CFG_TAG_ID(ETH_P_8021AD) | + DEV_MAC_TAGS_CFG_VLAN_AWR_ENA | + DEV_MAC_TAGS_CFG_VLAN_LEN_AWR_ENA, +@@ -2137,20 +2157,6 @@ static void ocelot_init_port(struct ocel + ocelot_port_writel(ocelot_port, 0, DEV_MAC_FC_MAC_HIGH_CFG); + ocelot_port_writel(ocelot_port, 0, DEV_MAC_FC_MAC_LOW_CFG); + +- /* Set Pause WM hysteresis +- * 152 = 6 * VLAN_ETH_FRAME_LEN / OCELOT_BUFFER_CELL_SZ +- * 101 = 4 * VLAN_ETH_FRAME_LEN / OCELOT_BUFFER_CELL_SZ +- */ +- ocelot_write_rix(ocelot, SYS_PAUSE_CFG_PAUSE_ENA | +- SYS_PAUSE_CFG_PAUSE_STOP(101) | +- SYS_PAUSE_CFG_PAUSE_START(152), SYS_PAUSE_CFG, port); +- +- /* Tail dropping watermark */ +- atop_wm = (ocelot->shared_queue_sz - 9 * VLAN_ETH_FRAME_LEN) / OCELOT_BUFFER_CELL_SZ; +- ocelot_write_rix(ocelot, ocelot_wm_enc(9 * VLAN_ETH_FRAME_LEN), +- SYS_ATOP, port); +- ocelot_write(ocelot, ocelot_wm_enc(atop_wm), SYS_ATOP_TOT_CFG); +- + /* Drop frames with multicast source address */ + ocelot_rmw_gix(ocelot, ANA_PORT_DROP_CFG_DROP_MC_SMAC_ENA, + ANA_PORT_DROP_CFG_DROP_MC_SMAC_ENA, |