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Message-ID: <20220925184633.4148143-3-horatiu.vultur@microchip.com>
Date: Sun, 25 Sep 2022 20:46:32 +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 2/3] net: lan966x: Add offload support for cbs
Lan966x switch supports credit based shaper in hardware according to
IEEE Std 802.1Q-2018 Section 8.6.8.2. Add support for cbs configuration
on egress port of lan966x switch.
Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
---
.../net/ethernet/microchip/lan966x/Makefile | 2 +-
.../ethernet/microchip/lan966x/lan966x_cbs.c | 70 +++++++++++++++++++
.../ethernet/microchip/lan966x/lan966x_main.h | 5 ++
.../ethernet/microchip/lan966x/lan966x_tc.c | 9 +++
4 files changed, 85 insertions(+), 1 deletion(-)
create mode 100644 drivers/net/ethernet/microchip/lan966x/lan966x_cbs.c
diff --git a/drivers/net/ethernet/microchip/lan966x/Makefile b/drivers/net/ethernet/microchip/lan966x/Makefile
index a3a519d10c73d..bc76949d1fd8f 100644
--- a/drivers/net/ethernet/microchip/lan966x/Makefile
+++ b/drivers/net/ethernet/microchip/lan966x/Makefile
@@ -10,4 +10,4 @@ lan966x-switch-objs := lan966x_main.o lan966x_phylink.o lan966x_port.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_tbf.o
+ lan966x_tbf.o lan966x_cbs.o
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_cbs.c b/drivers/net/ethernet/microchip/lan966x/lan966x_cbs.c
new file mode 100644
index 0000000000000..70cbbf8d2b67b
--- /dev/null
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_cbs.c
@@ -0,0 +1,70 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include "lan966x_main.h"
+
+int lan966x_cbs_add(struct lan966x_port *port,
+ struct tc_cbs_qopt_offload *qopt)
+{
+ struct lan966x *lan966x = port->lan966x;
+ u32 cir, cbs;
+ u8 se_idx;
+
+ /* Check for invalid values */
+ if (qopt->idleslope <= 0 ||
+ qopt->sendslope >= 0 ||
+ qopt->locredit >= qopt->hicredit)
+ return -EINVAL;
+
+ se_idx = SE_IDX_QUEUE + port->chip_port * NUM_PRIO_QUEUES + qopt->queue;
+ cir = qopt->idleslope;
+ cbs = (qopt->idleslope - qopt->sendslope) *
+ (qopt->hicredit - qopt->locredit) /
+ -qopt->sendslope;
+
+ /* 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(1) |
+ 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_cbs_del(struct lan966x_port *port,
+ struct tc_cbs_qopt_offload *qopt)
+{
+ struct lan966x *lan966x = port->lan966x;
+ u8 se_idx;
+
+ se_idx = SE_IDX_QUEUE + port->chip_port * NUM_PRIO_QUEUES + qopt->queue;
+
+ lan_rmw(QSYS_SE_CFG_SE_AVB_ENA_SET(1) |
+ 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_main.h b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
index 59f5a6b2b3bc0..168456f693bb7 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
@@ -471,6 +471,11 @@ int lan966x_tbf_add(struct lan966x_port *port,
int lan966x_tbf_del(struct lan966x_port *port,
struct tc_tbf_qopt_offload *qopt);
+int lan966x_cbs_add(struct lan966x_port *port,
+ struct tc_cbs_qopt_offload *qopt);
+int lan966x_cbs_del(struct lan966x_port *port,
+ struct tc_cbs_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_tc.c b/drivers/net/ethernet/microchip/lan966x/lan966x_tc.c
index ca03b7842f05f..4b05535c9e029 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_tc.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_tc.c
@@ -37,6 +37,13 @@ static int lan966x_tc_setup_qdisc_tbf(struct lan966x_port *port,
return -EOPNOTSUPP;
}
+static int lan966x_tc_setup_qdisc_cbs(struct lan966x_port *port,
+ struct tc_cbs_qopt_offload *qopt)
+{
+ return qopt->enable ? lan966x_cbs_add(port, qopt) :
+ lan966x_cbs_del(port, qopt);
+}
+
int lan966x_tc_setup(struct net_device *dev, enum tc_setup_type type,
void *type_data)
{
@@ -49,6 +56,8 @@ int lan966x_tc_setup(struct net_device *dev, enum tc_setup_type type,
return lan966x_tc_setup_qdisc_taprio(port, type_data);
case TC_SETUP_QDISC_TBF:
return lan966x_tc_setup_qdisc_tbf(port, type_data);
+ case TC_SETUP_QDISC_CBS:
+ return lan966x_tc_setup_qdisc_cbs(port, type_data);
default:
return -EOPNOTSUPP;
}
--
2.33.0
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