[PATCH net-next 01/10] net: dsa: microchip: split ksz8_change_mtu()
From: Bastien Curutchet <hidden>
Date: 2026-07-02 09:07:39
Also in:
lkml
Subsystem:
microchip ksz series ethernet switch driver, networking drivers, networking [dsa], the rest · Maintainers:
Woojung Huh, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Vladimir Oltean, Linus Torvalds
From: Vladimir Oltean <vladimir.oltean@nxp.com> Even among the ksz8 family, there are big differences in the MTU change procedure between KSZ87xx and KSZ88xx (KSZ8463 is like KSZ88xx here). Since we have 3 separate dsa_switch_ops for what constitutes "KSZ8", we can split those procedures into separate functions. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: Bastien Curutchet (Schneider Electric) <redacted> --- drivers/net/dsa/microchip/ksz8.c | 49 ++++++++++++++++------------------------ 1 file changed, 19 insertions(+), 30 deletions(-)
diff --git a/drivers/net/dsa/microchip/ksz8.c b/drivers/net/dsa/microchip/ksz8.c
index 586916570a84..c351179f6a60 100644
--- a/drivers/net/dsa/microchip/ksz8.c
+++ b/drivers/net/dsa/microchip/ksz8.c@@ -158,10 +158,17 @@ static int ksz8_reset_switch(struct ksz_device *dev) return 0; } -static int ksz8863_change_mtu(struct ksz_device *dev, int frame_size) +static int ksz88xx_change_mtu(struct dsa_switch *ds, int port, int mtu) { + struct ksz_device *dev = ds->priv; + int frame_size; u8 ctrl2 = 0; + if (!dsa_is_cpu_port(dev->ds, port)) + return 0; + + frame_size = mtu + VLAN_ETH_HLEN + ETH_FCS_LEN; + if (frame_size <= KSZ8_LEGAL_PACKET_SIZE) ctrl2 |= KSZ8863_LEGAL_PACKET_ENABLE; else if (frame_size > KSZ8863_NORMAL_PACKET_SIZE)
@@ -171,11 +178,18 @@ static int ksz8863_change_mtu(struct ksz_device *dev, int frame_size) KSZ8863_HUGE_PACKET_ENABLE, ctrl2); } -static int ksz8795_change_mtu(struct ksz_device *dev, int frame_size) +static int ksz87xx_change_mtu(struct dsa_switch *ds, int port, int mtu) { + struct ksz_device *dev = ds->priv; u8 ctrl1 = 0, ctrl2 = 0; + u16 frame_size; int ret; + if (!dsa_is_cpu_port(dev->ds, port)) + return 0; + + frame_size = mtu + VLAN_ETH_HLEN + ETH_FCS_LEN; + if (frame_size > KSZ8_LEGAL_PACKET_SIZE) ctrl2 |= SW_LEGAL_PACKET_DISABLE; if (frame_size > KSZ8863_NORMAL_PACKET_SIZE)
@@ -188,31 +202,6 @@ static int ksz8795_change_mtu(struct ksz_device *dev, int frame_size) return ksz_rmw8(dev, REG_SW_CTRL_2, SW_LEGAL_PACKET_DISABLE, ctrl2); } -static int ksz8_change_mtu(struct dsa_switch *ds, int port, int mtu) -{ - struct ksz_device *dev = ds->priv; - u16 frame_size; - - if (!dsa_is_cpu_port(dev->ds, port)) - return 0; - - frame_size = mtu + VLAN_ETH_HLEN + ETH_FCS_LEN; - - switch (dev->chip_id) { - case KSZ8795_CHIP_ID: - case KSZ8794_CHIP_ID: - case KSZ8765_CHIP_ID: - return ksz8795_change_mtu(dev, frame_size); - case KSZ8463_CHIP_ID: - case KSZ88X3_CHIP_ID: - case KSZ8864_CHIP_ID: - case KSZ8895_CHIP_ID: - return ksz8863_change_mtu(dev, frame_size); - } - - return -EOPNOTSUPP; -} - static int ksz8_port_queue_split(struct ksz_device *dev, int port, int queues) { u8 mask_4q, mask_2q;
@@ -2551,7 +2540,7 @@ const struct dsa_switch_ops ksz8463_switch_ops = { .port_mirror_del = ksz8_port_mirror_del, .get_stats64 = ksz_get_stats64, .get_pause_stats = ksz_get_pause_stats, - .port_change_mtu = ksz8_change_mtu, + .port_change_mtu = ksz88xx_change_mtu, .port_max_mtu = ksz_max_mtu, .suspend = ksz_suspend, .resume = ksz_resume,
@@ -2601,7 +2590,7 @@ const struct dsa_switch_ops ksz87xx_switch_ops = { .port_mirror_del = ksz8_port_mirror_del, .get_stats64 = ksz_get_stats64, .get_pause_stats = ksz_get_pause_stats, - .port_change_mtu = ksz8_change_mtu, + .port_change_mtu = ksz87xx_change_mtu, .port_max_mtu = ksz_max_mtu, .suspend = ksz_suspend, .resume = ksz_resume,
@@ -2652,7 +2641,7 @@ const struct dsa_switch_ops ksz88xx_switch_ops = { .port_mirror_del = ksz8_port_mirror_del, .get_stats64 = ksz_get_stats64, .get_pause_stats = ksz_get_pause_stats, - .port_change_mtu = ksz8_change_mtu, + .port_change_mtu = ksz88xx_change_mtu, .port_max_mtu = ksz_max_mtu, .get_wol = ksz_get_wol, .set_wol = ksz_set_wol,
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2.54.0