diff options
Diffstat (limited to 'target/linux/generic/backport-5.15/762-v5.11-net-dsa-mt7530-support-setting-MTU.patch')
| -rw-r--r-- | target/linux/generic/backport-5.15/762-v5.11-net-dsa-mt7530-support-setting-MTU.patch | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.15/762-v5.11-net-dsa-mt7530-support-setting-MTU.patch b/target/linux/generic/backport-5.15/762-v5.11-net-dsa-mt7530-support-setting-MTU.patch new file mode 100644 index 0000000000..eb487cdfb5 --- /dev/null +++ b/target/linux/generic/backport-5.15/762-v5.11-net-dsa-mt7530-support-setting-MTU.patch @@ -0,0 +1,112 @@ +From 9470174e7581e75a8ebd78964997314dfc2e706c Mon Sep 17 00:00:00 2001 +From: DENG Qingfang <dqfext@gmail.com> +Date: Tue, 3 Nov 2020 13:06:18 +0800 +Subject: [PATCH] net: dsa: mt7530: support setting MTU + +MT7530/7531 has a global RX packet length register, which can be used +to set MTU. + +Supported packet length values are 1522 (1518 if untagged), 1536, +1552, and multiple of 1024 (from 2048 to 15360). + +Signed-off-by: DENG Qingfang <dqfext@gmail.com> +Link: https://lore.kernel.org/r/20201103050618.11419-1-dqfext@gmail.com +Signed-off-by: Jakub Kicinski <kuba@kernel.org> +--- + drivers/net/dsa/mt7530.c | 49 ++++++++++++++++++++++++++++++++++++++++ + drivers/net/dsa/mt7530.h | 12 ++++++++++ + 2 files changed, 61 insertions(+) + +--- a/drivers/net/dsa/mt7530.c ++++ b/drivers/net/dsa/mt7530.c +@@ -1015,6 +1015,53 @@ mt7530_port_disable(struct dsa_switch *d + mutex_unlock(&priv->reg_mutex); + } + ++static int ++mt7530_port_change_mtu(struct dsa_switch *ds, int port, int new_mtu) ++{ ++ struct mt7530_priv *priv = ds->priv; ++ struct mii_bus *bus = priv->bus; ++ int length; ++ u32 val; ++ ++ /* When a new MTU is set, DSA always set the CPU port's MTU to the ++ * largest MTU of the slave ports. Because the switch only has a global ++ * RX length register, only allowing CPU port here is enough. ++ */ ++ if (!dsa_is_cpu_port(ds, port)) ++ return 0; ++ ++ mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED); ++ ++ val = mt7530_mii_read(priv, MT7530_GMACCR); ++ val &= ~MAX_RX_PKT_LEN_MASK; ++ ++ /* RX length also includes Ethernet header, MTK tag, and FCS length */ ++ length = new_mtu + ETH_HLEN + MTK_HDR_LEN + ETH_FCS_LEN; ++ if (length <= 1522) { ++ val |= MAX_RX_PKT_LEN_1522; ++ } else if (length <= 1536) { ++ val |= MAX_RX_PKT_LEN_1536; ++ } else if (length <= 1552) { ++ val |= MAX_RX_PKT_LEN_1552; ++ } else { ++ val &= ~MAX_RX_JUMBO_MASK; ++ val |= MAX_RX_JUMBO(DIV_ROUND_UP(length, 1024)); ++ val |= MAX_RX_PKT_LEN_JUMBO; ++ } ++ ++ mt7530_mii_write(priv, MT7530_GMACCR, val); ++ ++ mutex_unlock(&bus->mdio_lock); ++ ++ return 0; ++} ++ ++static int ++mt7530_port_max_mtu(struct dsa_switch *ds, int port) ++{ ++ return MT7530_MAX_MTU; ++} ++ + static void + mt7530_stp_state_set(struct dsa_switch *ds, int port, u8 state) + { +@@ -2652,6 +2699,8 @@ static const struct dsa_switch_ops mt753 + .get_sset_count = mt7530_get_sset_count, + .port_enable = mt7530_port_enable, + .port_disable = mt7530_port_disable, ++ .port_change_mtu = mt7530_port_change_mtu, ++ .port_max_mtu = mt7530_port_max_mtu, + .port_stp_state_set = mt7530_stp_state_set, + .port_bridge_join = mt7530_port_bridge_join, + .port_bridge_leave = mt7530_port_bridge_leave, +--- a/drivers/net/dsa/mt7530.h ++++ b/drivers/net/dsa/mt7530.h +@@ -11,6 +11,9 @@ + #define MT7530_NUM_FDB_RECORDS 2048 + #define MT7530_ALL_MEMBERS 0xff + ++#define MTK_HDR_LEN 4 ++#define MT7530_MAX_MTU (15 * 1024 - ETH_HLEN - ETH_FCS_LEN - MTK_HDR_LEN) ++ + enum mt753x_id { + ID_MT7530 = 0, + ID_MT7621 = 1, +@@ -301,6 +304,15 @@ enum mt7530_vlan_port_attr { + #define MT7531_DBG_CNT(x) (0x3018 + (x) * 0x100) + #define MT7531_DIS_CLR BIT(31) + ++#define MT7530_GMACCR 0x30e0 ++#define MAX_RX_JUMBO(x) ((x) << 2) ++#define MAX_RX_JUMBO_MASK GENMASK(5, 2) ++#define MAX_RX_PKT_LEN_MASK GENMASK(1, 0) ++#define MAX_RX_PKT_LEN_1522 0x0 ++#define MAX_RX_PKT_LEN_1536 0x1 ++#define MAX_RX_PKT_LEN_1552 0x2 ++#define MAX_RX_PKT_LEN_JUMBO 0x3 ++ + /* Register for MIB */ + #define MT7530_PORT_MIB_COUNTER(x) (0x4000 + (x) * 0x100) + #define MT7530_MIB_CCR 0x4fe0 |