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Message-Id: <20191123194844.9508-4-olteanv@gmail.com>
Date: Sat, 23 Nov 2019 21:48:44 +0200
From: Vladimir Oltean <olteanv@...il.com>
To: andrew@...n.ch, f.fainelli@...il.com, vivien.didelot@...il.com,
davem@...emloft.net, jakub.kicinski@...ronome.com
Cc: netdev@...r.kernel.org, Vladimir Oltean <olteanv@...il.com>
Subject: [PATCH net-next 3/3] net: dsa: vsc73xx: Make the MTU configurable
Instead of hardcoding the MTU to the maximum value allowed by the
hardware, obey the value known by the operating system.
Signed-off-by: Vladimir Oltean <olteanv@...il.com>
---
drivers/net/dsa/vitesse-vsc73xx-core.c | 30 +++++++++++++++++---------
1 file changed, 20 insertions(+), 10 deletions(-)
diff --git a/drivers/net/dsa/vitesse-vsc73xx-core.c b/drivers/net/dsa/vitesse-vsc73xx-core.c
index 42c1574d45f2..eed98566e2bf 100644
--- a/drivers/net/dsa/vitesse-vsc73xx-core.c
+++ b/drivers/net/dsa/vitesse-vsc73xx-core.c
@@ -663,16 +663,6 @@ static void vsc73xx_init_port(struct vsc73xx *vsc, int port)
VSC73XX_MAC_CFG_TX_EN |
VSC73XX_MAC_CFG_RX_EN);
- /* Max length, we can do up to 9.6 KiB, so allow that.
- * According to application not "VSC7398 Jumbo Frames" setting
- * up the MTU to 9.6 KB does not affect the performance on standard
- * frames, so just enable it. It is clear from the application note
- * that "9.6 kilobytes" == 9600 bytes.
- */
- vsc73xx_write(vsc, VSC73XX_BLOCK_MAC,
- port,
- VSC73XX_MAXLEN, 9600);
-
/* Flow control for the CPU port:
* Use a zero delay pause frame when pause condition is left
* Obey pause control frames
@@ -1029,6 +1019,24 @@ static void vsc73xx_get_ethtool_stats(struct dsa_switch *ds, int port,
}
}
+static int vsc73xx_change_mtu(struct dsa_switch *ds, int port, int new_mtu)
+{
+ struct vsc73xx *vsc = ds->priv;
+
+ return vsc73xx_write(vsc, VSC73XX_BLOCK_MAC, port,
+ VSC73XX_MAXLEN, new_mtu);
+}
+
+/* According to application not "VSC7398 Jumbo Frames" setting
+ * up the MTU to 9.6 KB does not affect the performance on standard
+ * frames. It is clear from the application note that
+ * "9.6 kilobytes" == 9600 bytes.
+ */
+static int vsc73xx_get_max_mtu(struct dsa_switch *ds, int port)
+{
+ return 9600;
+}
+
static const struct dsa_switch_ops vsc73xx_ds_ops = {
.get_tag_protocol = vsc73xx_get_tag_protocol,
.setup = vsc73xx_setup,
@@ -1040,6 +1048,8 @@ static const struct dsa_switch_ops vsc73xx_ds_ops = {
.get_sset_count = vsc73xx_get_sset_count,
.port_enable = vsc73xx_port_enable,
.port_disable = vsc73xx_port_disable,
+ .change_mtu = vsc73xx_change_mtu,
+ .get_max_mtu = vsc73xx_get_max_mtu,
};
static int vsc73xx_gpio_get(struct gpio_chip *chip, unsigned int offset)
--
2.17.1
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