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Date: Sun, 25 Sep 2022 20:46:31 +0200
From: Horatiu Vultur <horatiu.vultur@...rochip.com>
To: <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>
CC: <UNGLinuxDriver@...rochip.com>, <davem@...emloft.net>,
<edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
Horatiu Vultur <horatiu.vultur@...rochip.com>
Subject: [PATCH net-next 1/3] net: lan966x: Add offload support for tbf
The tbf qdisc allows to attach a shaper on traffic egress on a port or
on a queue. On port they are attached directly to the root and on queue
they are attached on one of the classes of the parent qdisc.
Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
---
.../net/ethernet/microchip/lan966x/Makefile | 3 +-
.../ethernet/microchip/lan966x/lan966x_main.h | 9 ++
.../ethernet/microchip/lan966x/lan966x_regs.h | 30 +++++++
.../ethernet/microchip/lan966x/lan966x_tbf.c | 85 +++++++++++++++++++
.../ethernet/microchip/lan966x/lan966x_tc.c | 17 ++++
5 files changed, 143 insertions(+), 1 deletion(-)
create mode 100644 drivers/net/ethernet/microchip/lan966x/lan966x_tbf.c
diff --git a/drivers/net/ethernet/microchip/lan966x/Makefile b/drivers/net/ethernet/microchip/lan966x/Makefile
index cac8b3901eaef..a3a519d10c73d 100644
--- a/drivers/net/ethernet/microchip/lan966x/Makefile
+++ b/drivers/net/ethernet/microchip/lan966x/Makefile
@@ -9,4 +9,5 @@ lan966x-switch-objs := lan966x_main.o lan966x_phylink.o lan966x_port.o \
lan966x_mac.o lan966x_ethtool.o lan966x_switchdev.o \
lan966x_vlan.o lan966x_fdb.o lan966x_mdb.o \
lan966x_ptp.o lan966x_fdma.o lan966x_lag.o \
- lan966x_tc.o lan966x_mqprio.o lan966x_taprio.o
+ lan966x_tc.o lan966x_mqprio.o lan966x_taprio.o \
+ lan966x_tbf.o
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
index 935c116715939..59f5a6b2b3bc0 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
@@ -9,6 +9,7 @@
#include <linux/phy.h>
#include <linux/phylink.h>
#include <linux/ptp_clock_kernel.h>
+#include <net/pkt_cls.h>
#include <net/pkt_sched.h>
#include <net/switchdev.h>
@@ -81,6 +82,9 @@
#define FDMA_INJ_CHANNEL 0
#define FDMA_DCB_MAX 512
+#define SE_IDX_QUEUE 0 /* 0-79 : Queue scheduler elements */
+#define SE_IDX_PORT 80 /* 80-89 : Port schedular elements */
+
/* MAC table entry types.
* ENTRYTYPE_NORMAL is subject to aging.
* ENTRYTYPE_LOCKED is not subject to aging.
@@ -462,6 +466,11 @@ int lan966x_taprio_add(struct lan966x_port *port,
int lan966x_taprio_del(struct lan966x_port *port);
int lan966x_taprio_speed_set(struct lan966x_port *port, int speed);
+int lan966x_tbf_add(struct lan966x_port *port,
+ struct tc_tbf_qopt_offload *qopt);
+int lan966x_tbf_del(struct lan966x_port *port,
+ struct tc_tbf_qopt_offload *qopt);
+
static inline void __iomem *lan_addr(void __iomem *base[],
int id, int tinst, int tcnt,
int gbase, int ginst,
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_regs.h b/drivers/net/ethernet/microchip/lan966x/lan966x_regs.h
index 684b08c6ff34e..01fa6bb680b92 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_regs.h
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_regs.h
@@ -1018,6 +1018,36 @@ enum lan966x_target {
/* QSYS:RES_CTRL:RES_CFG */
#define QSYS_RES_CFG(g) __REG(TARGET_QSYS, 0, 1, 32768, g, 1024, 8, 0, 0, 1, 4)
+/* QSYS:HSCH:CIR_CFG */
+#define QSYS_CIR_CFG(g) __REG(TARGET_QSYS, 0, 1, 16384, g, 90, 128, 0, 0, 1, 4)
+
+#define QSYS_CIR_CFG_CIR_RATE GENMASK(20, 6)
+#define QSYS_CIR_CFG_CIR_RATE_SET(x)\
+ FIELD_PREP(QSYS_CIR_CFG_CIR_RATE, x)
+#define QSYS_CIR_CFG_CIR_RATE_GET(x)\
+ FIELD_GET(QSYS_CIR_CFG_CIR_RATE, x)
+
+#define QSYS_CIR_CFG_CIR_BURST GENMASK(5, 0)
+#define QSYS_CIR_CFG_CIR_BURST_SET(x)\
+ FIELD_PREP(QSYS_CIR_CFG_CIR_BURST, x)
+#define QSYS_CIR_CFG_CIR_BURST_GET(x)\
+ FIELD_GET(QSYS_CIR_CFG_CIR_BURST, x)
+
+/* QSYS:HSCH:SE_CFG */
+#define QSYS_SE_CFG(g) __REG(TARGET_QSYS, 0, 1, 16384, g, 90, 128, 8, 0, 1, 4)
+
+#define QSYS_SE_CFG_SE_AVB_ENA BIT(4)
+#define QSYS_SE_CFG_SE_AVB_ENA_SET(x)\
+ FIELD_PREP(QSYS_SE_CFG_SE_AVB_ENA, x)
+#define QSYS_SE_CFG_SE_AVB_ENA_GET(x)\
+ FIELD_GET(QSYS_SE_CFG_SE_AVB_ENA, x)
+
+#define QSYS_SE_CFG_SE_FRM_MODE GENMASK(3, 2)
+#define QSYS_SE_CFG_SE_FRM_MODE_SET(x)\
+ FIELD_PREP(QSYS_SE_CFG_SE_FRM_MODE, x)
+#define QSYS_SE_CFG_SE_FRM_MODE_GET(x)\
+ FIELD_GET(QSYS_SE_CFG_SE_FRM_MODE, x)
+
/* QSYS:TAS_CONFIG:TAS_CFG_CTRL */
#define QSYS_TAS_CFG_CTRL __REG(TARGET_QSYS, 0, 1, 57372, 0, 1, 12, 0, 0, 1, 4)
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_tbf.c b/drivers/net/ethernet/microchip/lan966x/lan966x_tbf.c
new file mode 100644
index 0000000000000..4555a35d0d288
--- /dev/null
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_tbf.c
@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include "lan966x_main.h"
+
+int lan966x_tbf_add(struct lan966x_port *port,
+ struct tc_tbf_qopt_offload *qopt)
+{
+ struct lan966x *lan966x = port->lan966x;
+ bool root = qopt->parent == TC_H_ROOT;
+ u32 queue = 0;
+ u32 cir, cbs;
+ u32 se_idx;
+
+ if (!root) {
+ queue = TC_H_MIN(qopt->parent) - 1;
+ if (queue >= NUM_PRIO_QUEUES)
+ return -EOPNOTSUPP;
+ }
+
+ if (root)
+ se_idx = SE_IDX_PORT + port->chip_port;
+ else
+ se_idx = SE_IDX_QUEUE + port->chip_port * NUM_PRIO_QUEUES + queue;
+
+ cir = div_u64(qopt->replace_params.rate.rate_bytes_ps, 1000) * 8;
+ cbs = qopt->replace_params.max_size;
+
+ /* Rate unit is 100 kbps */
+ cir = DIV_ROUND_UP(cir, 100);
+ /* Avoid using zero rate */
+ cir = cir ?: 1;
+ /* Burst unit is 4kB */
+ cbs = DIV_ROUND_UP(cbs, 4096);
+ /* Avoid using zero burst */
+ cbs = cbs ?: 1;
+
+ /* Check that actually the result can be written */
+ if (cir > GENMASK(15, 0) ||
+ cbs > GENMASK(6, 0))
+ return -EINVAL;
+
+ lan_rmw(QSYS_SE_CFG_SE_AVB_ENA_SET(0) |
+ QSYS_SE_CFG_SE_FRM_MODE_SET(1),
+ QSYS_SE_CFG_SE_AVB_ENA |
+ QSYS_SE_CFG_SE_FRM_MODE,
+ lan966x, QSYS_SE_CFG(se_idx));
+
+ lan_wr(QSYS_CIR_CFG_CIR_RATE_SET(cir) |
+ QSYS_CIR_CFG_CIR_BURST_SET(cbs),
+ lan966x, QSYS_CIR_CFG(se_idx));
+
+ return 0;
+}
+
+int lan966x_tbf_del(struct lan966x_port *port,
+ struct tc_tbf_qopt_offload *qopt)
+{
+ struct lan966x *lan966x = port->lan966x;
+ bool root = qopt->parent == TC_H_ROOT;
+ u32 queue = 0;
+ u32 se_idx;
+
+ if (!root) {
+ queue = TC_H_MIN(qopt->parent) - 1;
+ if (queue >= NUM_PRIO_QUEUES)
+ return -EOPNOTSUPP;
+ }
+
+ if (root)
+ se_idx = SE_IDX_PORT + port->chip_port;
+ else
+ se_idx = SE_IDX_QUEUE + port->chip_port * NUM_PRIO_QUEUES + queue;
+
+ lan_rmw(QSYS_SE_CFG_SE_AVB_ENA_SET(0) |
+ QSYS_SE_CFG_SE_FRM_MODE_SET(0),
+ QSYS_SE_CFG_SE_AVB_ENA |
+ QSYS_SE_CFG_SE_FRM_MODE,
+ lan966x, QSYS_SE_CFG(se_idx));
+
+ lan_wr(QSYS_CIR_CFG_CIR_RATE_SET(0) |
+ QSYS_CIR_CFG_CIR_BURST_SET(0),
+ lan966x, QSYS_CIR_CFG(se_idx));
+
+ return 0;
+}
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_tc.c b/drivers/net/ethernet/microchip/lan966x/lan966x_tc.c
index cabc563f67685..ca03b7842f05f 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_tc.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_tc.c
@@ -22,6 +22,21 @@ static int lan966x_tc_setup_qdisc_taprio(struct lan966x_port *port,
lan966x_taprio_del(port);
}
+static int lan966x_tc_setup_qdisc_tbf(struct lan966x_port *port,
+ struct tc_tbf_qopt_offload *qopt)
+{
+ switch (qopt->command) {
+ case TC_TBF_REPLACE:
+ return lan966x_tbf_add(port, qopt);
+ case TC_TBF_DESTROY:
+ return lan966x_tbf_del(port, qopt);
+ default:
+ return -EOPNOTSUPP;
+ }
+
+ return -EOPNOTSUPP;
+}
+
int lan966x_tc_setup(struct net_device *dev, enum tc_setup_type type,
void *type_data)
{
@@ -32,6 +47,8 @@ int lan966x_tc_setup(struct net_device *dev, enum tc_setup_type type,
return lan966x_tc_setup_qdisc_mqprio(port, type_data);
case TC_SETUP_QDISC_TAPRIO:
return lan966x_tc_setup_qdisc_taprio(port, type_data);
+ case TC_SETUP_QDISC_TBF:
+ return lan966x_tc_setup_qdisc_tbf(port, type_data);
default:
return -EOPNOTSUPP;
}
--
2.33.0
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