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Message-Id: <20201222003112.1990768-3-vladimir.oltean@nxp.com>
Date: Tue, 22 Dec 2020 02:31:12 +0200
From: Vladimir Oltean <vladimir.oltean@....com>
To: Andrew Lunn <andrew@...n.ch>,
Florian Fainelli <f.fainelli@...il.com>,
Vivien Didelot <vivien.didelot@...il.com>,
Claudiu Manoil <claudiu.manoil@....com>,
Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc: "David S . Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
UNGLinuxDriver@...rochip.com
Subject: [RFC PATCH net-next 2/2] net: dsa: felix: add new VLAN-based tagger
There are use cases for which the existing tagger, based on the NPI
(Node Processor Interface) functionality, is insufficient.
Namely:
- Frames injected through the NPI port bypass the frame analyzer, so no
source address learning is performed, no TSN stream classification,
etc.
- Flow control is not functional over an NPI port (PAUSE frames are
encapsulated in the same Extraction Frame Header as all other frames)
- There can be at most one NPI port configured for an Ocelot switch. But
in NXP LS1028A and T1040 there are two Ethernet CPU ports. The non-NPI
port is currently either disabled, or operated as a plain user port
(albeit an internally-facing one). Having the ability to configure the
two CPU ports symmetrically could pave the way for e.g. creating a LAG
between them, to increase bandwidth seamlessly for the system.
So, there is a desire to have an alternative to the NPI mode.
This patch brings an implementation of the software-defined tag_8021q.c
tagger format, which also preserves full functionality under a
vlan_filtering bridge (unlike sja1105, the only other user of
tag_8021q).
It does this by using the TCAM engines for:
- pushing the RX VLAN as a second, outer tag, on egress towards the CPU
port
- redirecting towards the correct front port based on TX VLAN and
popping that on egress
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
MAINTAINERS | 1 +
drivers/net/dsa/ocelot/Kconfig | 4 +-
drivers/net/dsa/ocelot/Makefile | 5 +
drivers/net/dsa/ocelot/felix.c | 108 +++++++++++++--
drivers/net/dsa/ocelot/felix.h | 1 +
drivers/net/dsa/ocelot/felix_tag_8021q.c | 164 +++++++++++++++++++++++
drivers/net/dsa/ocelot/felix_tag_8021q.h | 20 +++
drivers/net/ethernet/mscc/ocelot.c | 18 ++-
include/soc/mscc/ocelot.h | 1 +
net/dsa/Kconfig | 34 +++++
net/dsa/Makefile | 3 +-
net/dsa/tag_ocelot_8021q.c | 61 +++++++++
12 files changed, 397 insertions(+), 23 deletions(-)
create mode 100644 drivers/net/dsa/ocelot/felix_tag_8021q.c
create mode 100644 drivers/net/dsa/ocelot/felix_tag_8021q.h
create mode 100644 net/dsa/tag_ocelot_8021q.c
diff --git a/MAINTAINERS b/MAINTAINERS
index a355db292486..a9cb0b659c00 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -12736,6 +12736,7 @@ F: drivers/net/dsa/ocelot/*
F: drivers/net/ethernet/mscc/
F: include/soc/mscc/ocelot*
F: net/dsa/tag_ocelot.c
+F: net/dsa/tag_ocelot_8021q.c
F: tools/testing/selftests/drivers/net/ocelot/*
OCXL (Open Coherent Accelerator Processor Interface OpenCAPI) DRIVER
diff --git a/drivers/net/dsa/ocelot/Kconfig b/drivers/net/dsa/ocelot/Kconfig
index c110e82a7973..ab8de14c4dae 100644
--- a/drivers/net/dsa/ocelot/Kconfig
+++ b/drivers/net/dsa/ocelot/Kconfig
@@ -2,11 +2,11 @@
config NET_DSA_MSCC_FELIX
tristate "Ocelot / Felix Ethernet switch support"
depends on NET_DSA && PCI
+ depends on NET_DSA_TAG_OCELOT_NPI || NET_DSA_TAG_OCELOT_8021Q
depends on NET_VENDOR_MICROSEMI
depends on NET_VENDOR_FREESCALE
depends on HAS_IOMEM
select MSCC_OCELOT_SWITCH_LIB
- select NET_DSA_TAG_OCELOT
select FSL_ENETC_MDIO
select PCS_LYNX
help
@@ -16,10 +16,10 @@ config NET_DSA_MSCC_FELIX
config NET_DSA_MSCC_SEVILLE
tristate "Ocelot / Seville Ethernet switch support"
depends on NET_DSA
+ depends on NET_DSA_TAG_OCELOT_NPI || NET_DSA_TAG_OCELOT_8021Q
depends on NET_VENDOR_MICROSEMI
depends on HAS_IOMEM
select MSCC_OCELOT_SWITCH_LIB
- select NET_DSA_TAG_OCELOT
select PCS_LYNX
help
This driver supports the VSC9953 (Seville) switch, which is embedded
diff --git a/drivers/net/dsa/ocelot/Makefile b/drivers/net/dsa/ocelot/Makefile
index f6dd131e7491..e9ea8c0331d8 100644
--- a/drivers/net/dsa/ocelot/Makefile
+++ b/drivers/net/dsa/ocelot/Makefile
@@ -9,3 +9,8 @@ mscc_felix-objs := \
mscc_seville-objs := \
felix.o \
seville_vsc9953.o
+
+ifdef CONFIG_NET_DSA_TAG_OCELOT_8021Q
+mscc_felix-objs += felix_tag_8021q.o
+mscc_seville-objs += felix_tag_8021q.o
+endif
diff --git a/drivers/net/dsa/ocelot/felix.c b/drivers/net/dsa/ocelot/felix.c
index 7dc230677b78..77f73c6bad0b 100644
--- a/drivers/net/dsa/ocelot/felix.c
+++ b/drivers/net/dsa/ocelot/felix.c
@@ -23,6 +23,7 @@
#include <net/pkt_sched.h>
#include <net/dsa.h>
#include "felix.h"
+#include "felix_tag_8021q.h"
static enum dsa_tag_protocol felix_get_tag_protocol(struct dsa_switch *ds,
int port,
@@ -439,6 +440,7 @@ static int felix_init_structs(struct felix *felix, int num_phys_ports)
{
struct ocelot *ocelot = &felix->ocelot;
phy_interface_t *port_phy_modes;
+ enum ocelot_tag_prefix prefix;
struct resource res;
int port, i, err;
@@ -448,6 +450,11 @@ static int felix_init_structs(struct felix *felix, int num_phys_ports)
if (!ocelot->ports)
return -ENOMEM;
+ if (IS_ENABLED(CONFIG_NET_DSA_TAG_OCELOT_NPI))
+ prefix = OCELOT_TAG_PREFIX_SHORT;
+ else if (IS_ENABLED(CONFIG_NET_DSA_TAG_OCELOT_8021Q))
+ prefix = OCELOT_TAG_PREFIX_NONE;
+
ocelot->map = felix->info->map;
ocelot->stats_layout = felix->info->stats_layout;
ocelot->num_stats = felix->info->num_stats;
@@ -455,8 +462,8 @@ static int felix_init_structs(struct felix *felix, int num_phys_ports)
ocelot->num_mact_rows = felix->info->num_mact_rows;
ocelot->vcap = felix->info->vcap;
ocelot->ops = felix->info->ops;
- ocelot->inj_prefix = OCELOT_TAG_PREFIX_SHORT;
- ocelot->xtr_prefix = OCELOT_TAG_PREFIX_SHORT;
+ ocelot->inj_prefix = prefix;
+ ocelot->xtr_prefix = prefix;
port_phy_modes = kcalloc(num_phys_ports, sizeof(phy_interface_t),
GFP_KERNEL);
@@ -578,6 +585,15 @@ static void felix_npi_port_init(struct ocelot *ocelot, int port)
ocelot_fields_write(ocelot, port, SYS_PAUSE_CFG_PAUSE_ENA, 0);
}
+static void felix_8021q_cpu_port_init(struct ocelot *ocelot, int port)
+{
+ ocelot->dsa_8021q_cpu = port;
+
+ /* Overwrite PGID_CPU with the non-tagging port */
+ ocelot_write_rix(ocelot, BIT(ocelot->dsa_8021q_cpu),
+ ANA_PGID_PGID, PGID_CPU);
+}
+
/* Hardware initialization done here so that we can allocate structures with
* devm without fear of dsa_register_switch returning -EPROBE_DEFER and causing
* us to allocate structures twice (leak memory) and map PCI memory twice
@@ -587,7 +603,7 @@ static int felix_setup(struct dsa_switch *ds)
{
struct ocelot *ocelot = ds->priv;
struct felix *felix = ocelot_to_felix(ocelot);
- int port, err;
+ int port, cpu = -1, err;
err = felix_init_structs(felix, ds->num_ports);
if (err)
@@ -607,10 +623,20 @@ static int felix_setup(struct dsa_switch *ds)
}
for (port = 0; port < ds->num_ports; port++) {
+ if (dsa_is_unused_port(ds, port))
+ continue;
+
ocelot_init_port(ocelot, port);
- if (dsa_is_cpu_port(ds, port))
- felix_npi_port_init(ocelot, port);
+ cpu = dsa_upstream_port(ds, port);
+ if (port == cpu)
+ continue;
+
+ /* Allow forwarding to and from the CPU port */
+ ocelot_rmw_rix(ocelot, BIT(cpu), BIT(cpu),
+ ANA_PGID_PGID, PGID_SRC + port);
+ ocelot_rmw_rix(ocelot, BIT(port), BIT(port),
+ ANA_PGID_PGID, PGID_SRC + cpu);
/* Set the default QoS Classification based on PCP and DEI
* bits of vlan tag.
@@ -618,14 +644,70 @@ static int felix_setup(struct dsa_switch *ds)
felix_port_qos_map_init(ocelot, port);
}
- /* Include the CPU port module in the forwarding mask for unknown
- * unicast - the hardware default value for ANA_FLOODING_FLD_UNICAST
- * excludes BIT(ocelot->num_phys_ports), and so does ocelot_init, since
- * Ocelot relies on whitelisting MAC addresses towards PGID_CPU.
- */
- ocelot_write_rix(ocelot,
- ANA_PGID_PGID_PGID(GENMASK(ocelot->num_phys_ports, 0)),
- ANA_PGID_PGID, PGID_UC);
+ if (IS_ENABLED(CONFIG_NET_DSA_TAG_OCELOT_NPI)) {
+ unsigned long flood_mask = BIT(ocelot->num_phys_ports);
+
+ felix_npi_port_init(ocelot, cpu);
+
+ /* Include the CPU port module (and indirectly, the NPI port)
+ * in the forwarding mask for unknown unicast - the hardware
+ * default value for ANA_FLOODING_FLD_UNICAST excludes
+ * BIT(ocelot->num_phys_ports), and so does ocelot_init,
+ * since Ocelot relies on whitelisting MAC addresses towards
+ * PGID_CPU.
+ * We do this because DSA does not yet perform RX filtering,
+ * and the NPI port does not perform source address learning,
+ * so traffic sent to Linux is effectively unknown from the
+ * switch's perspective.
+ */
+ for (port = 0; port < ds->num_ports; port++) {
+ if (dsa_is_unused_port(ds, port))
+ continue;
+
+ flood_mask |= BIT(port);
+ }
+
+ ocelot_write_rix(ocelot, ANA_PGID_PGID_PGID(flood_mask),
+ ANA_PGID_PGID, PGID_UC);
+ } else if (IS_ENABLED(CONFIG_NET_DSA_TAG_OCELOT_8021Q)) {
+ unsigned long flood_mask = 0;
+
+ felix_8021q_cpu_port_init(ocelot, cpu);
+
+ for (port = 0; port < ds->num_ports; port++) {
+ if (dsa_is_unused_port(ds, port))
+ continue;
+
+ flood_mask |= BIT(port);
+
+ /* This overwrites ocelot_init():
+ * Do not forward BPDU frames to the CPU port module,
+ * for 2 reasons:
+ * - When these packets are injected from the tag_8021q
+ * CPU port, we want them to go out, not loop back
+ * into the system.
+ * - STP traffic ingressing on a user port should go to
+ * the tag_8021q CPU port, not to the hardware CPU
+ * port module.
+ */
+ ocelot_write_gix(ocelot,
+ ANA_PORT_CPU_FWD_BPDU_CFG_BPDU_REDIR_ENA(0),
+ ANA_PORT_CPU_FWD_BPDU_CFG, port);
+ }
+
+ /* In tag_8021q mode, the CPU port module is unused. So we
+ * want to disable flooding of any kind to the CPU port module
+ * (which is BIT(ocelot->num_phys_ports)).
+ */
+ ocelot_write_rix(ocelot, ANA_PGID_PGID_PGID(flood_mask),
+ ANA_PGID_PGID, PGID_UC);
+ ocelot_write_rix(ocelot, ANA_PGID_PGID_PGID(flood_mask),
+ ANA_PGID_PGID, PGID_MC);
+
+ err = felix_setup_8021q_tagging(ocelot);
+ if (err)
+ return err;
+ }
ds->mtu_enforcement_ingress = true;
ds->configure_vlan_while_not_filtering = true;
diff --git a/drivers/net/dsa/ocelot/felix.h b/drivers/net/dsa/ocelot/felix.h
index 4c717324ac2f..71f343326c00 100644
--- a/drivers/net/dsa/ocelot/felix.h
+++ b/drivers/net/dsa/ocelot/felix.h
@@ -50,6 +50,7 @@ struct felix {
struct lynx_pcs **pcs;
resource_size_t switch_base;
resource_size_t imdio_base;
+ struct dsa_8021q_context *dsa_8021q_ctx;
};
struct net_device *felix_port_to_netdev(struct ocelot *ocelot, int port);
diff --git a/drivers/net/dsa/ocelot/felix_tag_8021q.c b/drivers/net/dsa/ocelot/felix_tag_8021q.c
new file mode 100644
index 000000000000..5c973194b428
--- /dev/null
+++ b/drivers/net/dsa/ocelot/felix_tag_8021q.c
@@ -0,0 +1,164 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright 2020 NXP Semiconductors
+ *
+ * An implementation of the software-defined tag_8021q.c tagger format, which
+ * also preserves full functionality under a vlan_filtering bridge. It does
+ * this by using the TCAM engines for:
+ * - pushing the RX VLAN as a second, outer tag, on egress towards the CPU port
+ * - redirecting towards the correct front port based on TX VLAN and popping
+ * that on egress
+ */
+#include "../../ethernet/mscc/ocelot_vcap.h" /* Yeah, I know, this is RFC */
+#include <soc/mscc/ocelot_vcap.h>
+#include <linux/dsa/8021q.h>
+#include <linux/if_bridge.h>
+#include "felix.h"
+#include "felix_tag_8021q.h"
+
+static int felix_tag_8021q_rxvlan_add(struct ocelot *ocelot, int port, u16 vid,
+ bool pvid, bool untagged)
+{
+ const struct vcap_props *vcap = &ocelot->vcap[VCAP_ES0];
+ int key_length = vcap->keys[VCAP_ES0_IGR_PORT].length;
+ struct ocelot_vcap_filter *outer_tagging_rule;
+
+ /* We don't need to install the rxvlan into the other ports' filtering
+ * tables, because we're just pushing the rxvlan when sending towards
+ * the CPU
+ */
+ if (!pvid)
+ return 0;
+
+ outer_tagging_rule = kzalloc(sizeof(struct ocelot_vcap_filter),
+ GFP_KERNEL);
+ if (!outer_tagging_rule)
+ return -ENOMEM;
+
+ outer_tagging_rule->key_type = OCELOT_VCAP_KEY_ANY;
+ outer_tagging_rule->prio = 2;
+ outer_tagging_rule->id = 5000 + port;
+ outer_tagging_rule->block_id = VCAP_ES0;
+ outer_tagging_rule->type = OCELOT_VCAP_FILTER_OFFLOAD;
+ outer_tagging_rule->lookup = 0;
+ outer_tagging_rule->ingress_port.value = port;
+ outer_tagging_rule->ingress_port.mask = GENMASK(key_length - 1, 0);
+ outer_tagging_rule->egress_port.value = ocelot->dsa_8021q_cpu;
+ outer_tagging_rule->egress_port.mask = GENMASK(key_length - 1, 0);
+ outer_tagging_rule->action.push_outer_tag = OCELOT_ES0_TAG;
+ outer_tagging_rule->action.tag_a_tpid_sel = OCELOT_TAG_TPID_SEL_8021AD;
+ outer_tagging_rule->action.tag_a_vid_sel = 1;
+ outer_tagging_rule->action.vid_a_val = vid;
+
+ return ocelot_vcap_filter_add(ocelot, outer_tagging_rule, NULL);
+}
+
+static int felix_tag_8021q_txvlan_add(struct ocelot *ocelot, int port, u16 vid,
+ bool pvid, bool untagged)
+{
+ struct ocelot_vcap_filter *untagging_rule;
+ struct ocelot_vcap_filter *redirect_rule;
+ int ret;
+
+ /* tag_8021q.c assumes we are implementing this via port VLAN
+ * membership, which we aren't. So we don't need to add any VCAP filter
+ * for the CPU port.
+ */
+ if (port == ocelot->dsa_8021q_cpu)
+ return 0;
+
+ untagging_rule = kzalloc(sizeof(struct ocelot_vcap_filter), GFP_KERNEL);
+ if (!untagging_rule)
+ return -ENOMEM;
+
+ redirect_rule = kzalloc(sizeof(struct ocelot_vcap_filter), GFP_KERNEL);
+ if (!redirect_rule) {
+ kfree(untagging_rule);
+ return -ENOMEM;
+ }
+
+ untagging_rule->key_type = OCELOT_VCAP_KEY_ANY;
+ untagging_rule->ingress_port_mask = BIT(ocelot->dsa_8021q_cpu);
+ untagging_rule->vlan.vid.value = vid;
+ untagging_rule->vlan.vid.mask = VLAN_VID_MASK;
+ untagging_rule->prio = 2;
+ untagging_rule->id = 6000 + port;
+ untagging_rule->block_id = VCAP_IS1;
+ untagging_rule->type = OCELOT_VCAP_FILTER_OFFLOAD;
+ untagging_rule->lookup = 0;
+ untagging_rule->action.vlan_pop_cnt_ena = true;
+ untagging_rule->action.vlan_pop_cnt = 1;
+ untagging_rule->action.pag_override_mask = 0xff;
+ untagging_rule->action.pag_val = 10 + port;
+
+ ret = ocelot_vcap_filter_add(ocelot, untagging_rule, NULL);
+ if (ret) {
+ kfree(untagging_rule);
+ kfree(redirect_rule);
+ return ret;
+ }
+
+ redirect_rule->key_type = OCELOT_VCAP_KEY_ANY;
+ redirect_rule->ingress_port_mask = BIT(ocelot->dsa_8021q_cpu);
+ redirect_rule->pag = 10 + port;
+ redirect_rule->prio = 2;
+ redirect_rule->id = 7000 + port;
+ redirect_rule->block_id = VCAP_IS2;
+ redirect_rule->type = OCELOT_VCAP_FILTER_OFFLOAD;
+ redirect_rule->lookup = 0;
+ redirect_rule->action.mask_mode = OCELOT_MASK_MODE_REDIRECT;
+ redirect_rule->action.port_mask = BIT(port);
+
+ ret = ocelot_vcap_filter_add(ocelot, redirect_rule, NULL);
+ if (ret) {
+ ocelot_vcap_filter_del(ocelot, untagging_rule);
+ kfree(redirect_rule);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int felix_tag_8021q_vlan_add(struct dsa_switch *ds, int port, u16 vid,
+ u16 flags)
+{
+ bool untagged = flags & BRIDGE_VLAN_INFO_UNTAGGED;
+ bool pvid = flags & BRIDGE_VLAN_INFO_PVID;
+ struct ocelot *ocelot = ds->priv;
+
+ if (vid_is_dsa_8021q_rxvlan(vid))
+ return felix_tag_8021q_rxvlan_add(ocelot, port, vid, pvid,
+ untagged);
+
+ if (vid_is_dsa_8021q_txvlan(vid))
+ return felix_tag_8021q_txvlan_add(ocelot, port, vid, pvid,
+ untagged);
+
+ return 0;
+}
+
+static const struct dsa_8021q_ops felix_tag_8021q_ops = {
+ .vlan_add = felix_tag_8021q_vlan_add,
+};
+
+int felix_setup_8021q_tagging(struct ocelot *ocelot)
+{
+ struct felix *felix = ocelot_to_felix(ocelot);
+ struct dsa_switch *ds = felix->ds;
+ int ret;
+
+ felix->dsa_8021q_ctx = devm_kzalloc(ds->dev,
+ sizeof(*felix->dsa_8021q_ctx),
+ GFP_KERNEL);
+ if (!felix->dsa_8021q_ctx)
+ return -ENOMEM;
+
+ felix->dsa_8021q_ctx->ops = &felix_tag_8021q_ops;
+ felix->dsa_8021q_ctx->proto = htons(ETH_P_8021AD);
+ felix->dsa_8021q_ctx->ds = ds;
+
+ rtnl_lock();
+ ret = dsa_8021q_setup(felix->dsa_8021q_ctx, true);
+ rtnl_unlock();
+
+ return ret;
+}
diff --git a/drivers/net/dsa/ocelot/felix_tag_8021q.h b/drivers/net/dsa/ocelot/felix_tag_8021q.h
new file mode 100644
index 000000000000..47684a18c96e
--- /dev/null
+++ b/drivers/net/dsa/ocelot/felix_tag_8021q.h
@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright 2020 NXP Semiconductors
+ */
+#ifndef _MSCC_FELIX_TAG_8021Q_H
+#define _MSCC_FELIX_TAG_8021Q_H
+
+#if IS_ENABLED(CONFIG_NET_DSA_TAG_OCELOT_8021Q)
+
+int felix_setup_8021q_tagging(struct ocelot *ocelot);
+
+#else
+
+static inline int felix_setup_8021q_tagging(struct ocelot *ocelot)
+{
+ return -EOPNOTSUPP;
+}
+
+#endif /* IS_ENABLED(CONFIG_NET_DSA_TAG_OCELOT_8021Q) */
+
+#endif /* _MSCC_FELIX_TAG_8021Q_H */
diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
index 0b9992bd6626..be4671bfe95f 100644
--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/drivers/net/ethernet/mscc/ocelot.c
@@ -911,8 +911,13 @@ void ocelot_bridge_stp_state_set(struct ocelot *ocelot, int port, u8 state)
* a source for the other ports.
*/
for (p = 0; p < ocelot->num_phys_ports; p++) {
+ unsigned long mask = 0;
+
+ if (p == ocelot->dsa_8021q_cpu)
+ continue;
+
if (ocelot->bridge_fwd_mask & BIT(p)) {
- unsigned long mask = ocelot->bridge_fwd_mask & ~BIT(p);
+ mask = ocelot->bridge_fwd_mask & ~BIT(p);
for (i = 0; i < ocelot->num_phys_ports; i++) {
unsigned long bond_mask = ocelot->lags[i];
@@ -925,13 +930,12 @@ void ocelot_bridge_stp_state_set(struct ocelot *ocelot, int port, u8 state)
break;
}
}
-
- ocelot_write_rix(ocelot, mask,
- ANA_PGID_PGID, PGID_SRC + p);
- } else {
- ocelot_write_rix(ocelot, 0,
- ANA_PGID_PGID, PGID_SRC + p);
}
+
+ if (ocelot->dsa_8021q_cpu >= 0)
+ mask |= ocelot->dsa_8021q_cpu;
+
+ ocelot_write_rix(ocelot, mask, ANA_PGID_PGID, PGID_SRC + p);
}
}
EXPORT_SYMBOL(ocelot_bridge_stp_state_set);
diff --git a/include/soc/mscc/ocelot.h b/include/soc/mscc/ocelot.h
index 2f4cd3288bcc..4cbb7655ef0c 100644
--- a/include/soc/mscc/ocelot.h
+++ b/include/soc/mscc/ocelot.h
@@ -631,6 +631,7 @@ struct ocelot {
u8 num_phys_ports;
int npi;
+ int dsa_8021q_cpu;
enum ocelot_tag_prefix inj_prefix;
enum ocelot_tag_prefix xtr_prefix;
diff --git a/net/dsa/Kconfig b/net/dsa/Kconfig
index dfecd7b22fd7..a4ff1385d270 100644
--- a/net/dsa/Kconfig
+++ b/net/dsa/Kconfig
@@ -111,6 +111,40 @@ config NET_DSA_TAG_OCELOT
Say Y or M if you want to enable support for tagging frames for the
Ocelot switches (VSC7511, VSC7512, VSC7513, VSC7514, VSC9959).
+choice
+ prompt "Tagging format"
+ depends on NET_DSA_TAG_OCELOT
+ default NET_DSA_TAG_OCELOT_NPI
+ help
+ Choose the tagging format for frames delivered by the Ocelot
+ switches to the CPU.
+
+config NET_DSA_TAG_OCELOT_NPI
+ bool "Native tagging over NPI"
+ help
+ Say Y if you want to enable NPI tagging for the Ocelot switches.
+ In this mode, the frames over the Ethernet CPU port are prepended
+ with a hardware-defined injection/extraction frame header.
+ Flow control (PAUSE frames) over the CPU port is not supported
+ when operating in this mode.
+
+ If unsure, say Y.
+
+config NET_DSA_TAG_OCELOT_8021Q
+ bool "VLAN-based tagging"
+ select NET_DSA_TAG_8021Q
+ help
+ Say Y if you want to enable support for tagging frames with a custom
+ VLAN-based header. Frames that require timestamping, such as PTP, are
+ not delivered over Ethernet but over register-based MMIO. Flow
+ control over the CPU port is functional in this mode. When using this
+ mode, less TCAM resources (VCAP IS1, IS2, ES0) are available for use
+ with tc-flower.
+
+ If unsure, say N.
+
+endchoice
+
config NET_DSA_TAG_QCA
tristate "Tag driver for Qualcomm Atheros QCA8K switches"
help
diff --git a/net/dsa/Makefile b/net/dsa/Makefile
index 0fb2b75a7ae3..0e0d828fec51 100644
--- a/net/dsa/Makefile
+++ b/net/dsa/Makefile
@@ -14,7 +14,8 @@ obj-$(CONFIG_NET_DSA_TAG_KSZ) += tag_ksz.o
obj-$(CONFIG_NET_DSA_TAG_RTL4_A) += tag_rtl4_a.o
obj-$(CONFIG_NET_DSA_TAG_LAN9303) += tag_lan9303.o
obj-$(CONFIG_NET_DSA_TAG_MTK) += tag_mtk.o
-obj-$(CONFIG_NET_DSA_TAG_OCELOT) += tag_ocelot.o
+obj-$(CONFIG_NET_DSA_TAG_OCELOT_NPI) += tag_ocelot.o
+obj-$(CONFIG_NET_DSA_TAG_OCELOT_8021Q) += tag_ocelot_8021q.o
obj-$(CONFIG_NET_DSA_TAG_QCA) += tag_qca.o
obj-$(CONFIG_NET_DSA_TAG_SJA1105) += tag_sja1105.o
obj-$(CONFIG_NET_DSA_TAG_TRAILER) += tag_trailer.o
diff --git a/net/dsa/tag_ocelot_8021q.c b/net/dsa/tag_ocelot_8021q.c
new file mode 100644
index 000000000000..fa89c6a5bb7d
--- /dev/null
+++ b/net/dsa/tag_ocelot_8021q.c
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright 2020 NXP Semiconductors
+ */
+#include <linux/dsa/8021q.h>
+#include "dsa_priv.h"
+
+static struct sk_buff *ocelot_xmit(struct sk_buff *skb,
+ struct net_device *netdev)
+{
+ struct dsa_port *dp = dsa_slave_to_port(netdev);
+ u16 tx_vid = dsa_8021q_tx_vid(dp->ds, dp->index);
+ u16 queue_mapping = skb_get_queue_mapping(skb);
+ u8 pcp = netdev_txq_to_tc(netdev, queue_mapping);
+
+ return dsa_8021q_xmit(skb, netdev, ETH_P_8021Q,
+ ((pcp << VLAN_PRIO_SHIFT) | tx_vid));
+}
+
+static struct sk_buff *ocelot_rcv(struct sk_buff *skb,
+ struct net_device *netdev,
+ struct packet_type *pt)
+{
+ int src_port, switch_id, qos_class;
+ u16 vid, tci;
+
+ skb_push_rcsum(skb, ETH_HLEN);
+ if (skb_vlan_tag_present(skb)) {
+ tci = skb_vlan_tag_get(skb);
+ __vlan_hwaccel_clear_tag(skb);
+ } else {
+ __skb_vlan_pop(skb, &tci);
+ }
+ skb_pull_rcsum(skb, ETH_HLEN);
+
+ vid = tci & VLAN_VID_MASK;
+ src_port = dsa_8021q_rx_source_port(vid);
+ switch_id = dsa_8021q_rx_switch_id(vid);
+ qos_class = (tci & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
+
+ skb->dev = dsa_master_find_slave(netdev, switch_id, src_port);
+ if (!skb->dev)
+ return NULL;
+
+ skb->offload_fwd_mark = 1;
+ skb->priority = qos_class;
+
+ return skb;
+}
+
+static struct dsa_device_ops ocelot_netdev_ops = {
+ .name = "ocelot",
+ .proto = DSA_TAG_PROTO_OCELOT,
+ .xmit = ocelot_xmit,
+ .rcv = ocelot_rcv,
+ .overhead = VLAN_HLEN,
+};
+
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_OCELOT);
+
+module_dsa_tag_driver(ocelot_netdev_ops);
--
2.25.1
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