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b704c537cf
This is an automatically generated commit which aids following Kernel patch history, as git will see the move and copy as a rename thus defeating the purpose. For the original discussion see: https://lists.openwrt.org/pipermail/openwrt-devel/2023-October/041673.html Signed-off-by: Martin Schiller <ms@dev.tdt.de>
128 lines
4.7 KiB
Diff
128 lines
4.7 KiB
Diff
From c40bb4fedcd6b8b6a714da5dd466eb88ed2652d1 Mon Sep 17 00:00:00 2001
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From: Aleksander Jan Bajkowski <olek2@wp.pl>
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Date: Wed, 9 Mar 2022 00:04:57 +0100
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Subject: net: dsa: lantiq_gswip: enable jumbo frames on GSWIP
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This enables non-standard MTUs on a per-port basis, with the overall
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frame size set based on the CPU port.
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When the MTU is not changed, this should have no effect.
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Long packets crash the switch with MTUs of greater than 2526, so the
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maximum is limited for now. Medium packets are sometimes dropped (e.g.
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TCP over 2477, UDP over 2516-2519, ICMP over 2526), Hence an MTU value
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of 2400 seems safe.
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Signed-off-by: Thomas Nixon <tom@tomn.co.uk>
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Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl>
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Link: https://lore.kernel.org/r/20220308230457.1599237-1-olek2@wp.pl
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Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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---
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drivers/net/dsa/lantiq_gswip.c | 53 ++++++++++++++++++++++++++++++++++++++----
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1 file changed, 49 insertions(+), 4 deletions(-)
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--- a/drivers/net/dsa/lantiq_gswip.c
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+++ b/drivers/net/dsa/lantiq_gswip.c
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@@ -213,6 +213,7 @@
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#define GSWIP_MAC_CTRL_0_GMII_MII 0x0001
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#define GSWIP_MAC_CTRL_0_GMII_RGMII 0x0002
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#define GSWIP_MAC_CTRL_2p(p) (0x905 + ((p) * 0xC))
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+#define GSWIP_MAC_CTRL_2_LCHKL BIT(2) /* Frame Length Check Long Enable */
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#define GSWIP_MAC_CTRL_2_MLEN BIT(3) /* Maximum Untagged Frame Lnegth */
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/* Ethernet Switch Fetch DMA Port Control Register */
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@@ -239,6 +240,15 @@
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#define XRX200_GPHY_FW_ALIGN (16 * 1024)
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+/* Maximum packet size supported by the switch. In theory this should be 10240,
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+ * but long packets currently cause lock-ups with an MTU of over 2526. Medium
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+ * packets are sometimes dropped (e.g. TCP over 2477, UDP over 2516-2519, ICMP
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+ * over 2526), hence an MTU value of 2400 seems safe. This issue only affects
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+ * packet reception. This is probably caused by the PPA engine, which is on the
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+ * RX part of the device. Packet transmission works properly up to 10240.
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+ */
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+#define GSWIP_MAX_PACKET_LENGTH 2400
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+
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struct gswip_hw_info {
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int max_ports;
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int cpu_port;
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@@ -846,10 +856,6 @@ static int gswip_setup(struct dsa_switch
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gswip_switch_mask(priv, 0, GSWIP_PCE_PCTRL_0_INGRESS,
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GSWIP_PCE_PCTRL_0p(cpu_port));
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- gswip_switch_mask(priv, 0, GSWIP_MAC_CTRL_2_MLEN,
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- GSWIP_MAC_CTRL_2p(cpu_port));
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- gswip_switch_w(priv, VLAN_ETH_FRAME_LEN + 8 + ETH_FCS_LEN,
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- GSWIP_MAC_FLEN);
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gswip_switch_mask(priv, 0, GSWIP_BM_QUEUE_GCTRL_GL_MOD,
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GSWIP_BM_QUEUE_GCTRL);
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@@ -866,6 +872,8 @@ static int gswip_setup(struct dsa_switch
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return err;
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}
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+ ds->mtu_enforcement_ingress = true;
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+
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gswip_port_enable(ds, cpu_port, NULL);
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ds->configure_vlan_while_not_filtering = false;
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@@ -1456,6 +1464,39 @@ static void gswip_phylink_set_capab(unsi
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linkmode_and(state->advertising, state->advertising, mask);
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}
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+static int gswip_port_max_mtu(struct dsa_switch *ds, int port)
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+{
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+ /* Includes 8 bytes for special header. */
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+ return GSWIP_MAX_PACKET_LENGTH - VLAN_ETH_HLEN - ETH_FCS_LEN;
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+}
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+
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+static int gswip_port_change_mtu(struct dsa_switch *ds, int port, int new_mtu)
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+{
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+ struct gswip_priv *priv = ds->priv;
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+ int cpu_port = priv->hw_info->cpu_port;
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+
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+ /* CPU port always has maximum mtu of user ports, so use it to set
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+ * switch frame size, including 8 byte special header.
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+ */
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+ if (port == cpu_port) {
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+ new_mtu += 8;
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+ gswip_switch_w(priv, VLAN_ETH_HLEN + new_mtu + ETH_FCS_LEN,
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+ GSWIP_MAC_FLEN);
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+ }
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+
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+ /* Enable MLEN for ports with non-standard MTUs, including the special
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+ * header on the CPU port added above.
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+ */
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+ if (new_mtu != ETH_DATA_LEN)
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+ gswip_switch_mask(priv, 0, GSWIP_MAC_CTRL_2_MLEN,
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+ GSWIP_MAC_CTRL_2p(port));
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+ else
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+ gswip_switch_mask(priv, GSWIP_MAC_CTRL_2_MLEN, 0,
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+ GSWIP_MAC_CTRL_2p(port));
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+
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+ return 0;
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+}
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+
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static void gswip_xrx200_phylink_validate(struct dsa_switch *ds, int port,
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unsigned long *supported,
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struct phylink_link_state *state)
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@@ -1812,6 +1853,8 @@ static const struct dsa_switch_ops gswip
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.port_fdb_add = gswip_port_fdb_add,
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.port_fdb_del = gswip_port_fdb_del,
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.port_fdb_dump = gswip_port_fdb_dump,
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+ .port_change_mtu = gswip_port_change_mtu,
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+ .port_max_mtu = gswip_port_max_mtu,
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.phylink_validate = gswip_xrx200_phylink_validate,
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.phylink_mac_config = gswip_phylink_mac_config,
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.phylink_mac_link_down = gswip_phylink_mac_link_down,
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@@ -1836,6 +1879,8 @@ static const struct dsa_switch_ops gswip
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.port_fdb_add = gswip_port_fdb_add,
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.port_fdb_del = gswip_port_fdb_del,
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.port_fdb_dump = gswip_port_fdb_dump,
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+ .port_change_mtu = gswip_port_change_mtu,
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+ .port_max_mtu = gswip_port_max_mtu,
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.phylink_validate = gswip_xrx300_phylink_validate,
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.phylink_mac_config = gswip_phylink_mac_config,
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.phylink_mac_link_down = gswip_phylink_mac_link_down,
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