From 84d85fa82e7084b05b23912cc7ffb12b378ecb0e Mon Sep 17 00:00:00 2001 From: Horatiu Vultur Date: Sun, 25 Sep 2022 20:46:33 +0200 Subject: [PATCH] net: lan966x: Add offload support for ets Add ets qdisc which allows to mix strict priority with bandwidth-sharing bands. The ets qdisc needs to be attached as root qdisc. Signed-off-by: Horatiu Vultur Signed-off-by: David S. Miller --- .../net/ethernet/microchip/lan966x/Makefile | 2 +- .../ethernet/microchip/lan966x/lan966x_ets.c | 96 +++++++++++++++++++ .../ethernet/microchip/lan966x/lan966x_main.h | 5 + .../ethernet/microchip/lan966x/lan966x_regs.h | 20 ++++ .../ethernet/microchip/lan966x/lan966x_tc.c | 17 ++++ 5 files changed, 139 insertions(+), 1 deletion(-) create mode 100644 drivers/net/ethernet/microchip/lan966x/lan966x_ets.c diff --git a/drivers/net/ethernet/microchip/lan966x/Makefile b/drivers/net/ethernet/microchip/lan966x/Makefile index bc76949d1fd8f..7360c1c7b53c3 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_cbs.o + lan966x_tbf.o lan966x_cbs.o lan966x_ets.o diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_ets.c b/drivers/net/ethernet/microchip/lan966x/lan966x_ets.c new file mode 100644 index 0000000000000..8310d3f35404e --- /dev/null +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_ets.c @@ -0,0 +1,96 @@ +// SPDX-License-Identifier: GPL-2.0+ + +#include "lan966x_main.h" + +#define DWRR_COST_BIT_WIDTH BIT(5) + +static u32 lan966x_ets_hw_cost(u32 w_min, u32 weight) +{ + u32 res; + + /* Round half up: Multiply with 16 before division, + * add 8 and divide result with 16 again + */ + res = (((DWRR_COST_BIT_WIDTH << 4) * w_min / weight) + 8) >> 4; + return max_t(u32, 1, res) - 1; +} + +int lan966x_ets_add(struct lan966x_port *port, + struct tc_ets_qopt_offload *qopt) +{ + struct tc_ets_qopt_offload_replace_params *params; + struct lan966x *lan966x = port->lan966x; + u32 w_min = 100; + u8 count = 0; + u32 se_idx; + u8 i; + + /* Check the input */ + if (qopt->parent != TC_H_ROOT) + return -EINVAL; + + params = &qopt->replace_params; + if (params->bands != NUM_PRIO_QUEUES) + return -EINVAL; + + for (i = 0; i < params->bands; ++i) { + /* In the switch the DWRR is always on the lowest consecutive + * priorities. Due to this, the first priority must map to the + * first DWRR band. + */ + if (params->priomap[i] != (7 - i)) + return -EINVAL; + + if (params->quanta[i] && params->weights[i] == 0) + return -EINVAL; + } + + se_idx = SE_IDX_PORT + port->chip_port; + + /* Find minimum weight */ + for (i = 0; i < params->bands; ++i) { + if (params->quanta[i] == 0) + continue; + + w_min = min(w_min, params->weights[i]); + } + + for (i = 0; i < params->bands; ++i) { + if (params->quanta[i] == 0) + continue; + + ++count; + + lan_wr(lan966x_ets_hw_cost(w_min, params->weights[i]), + lan966x, QSYS_SE_DWRR_CFG(se_idx, 7 - i)); + } + + lan_rmw(QSYS_SE_CFG_SE_DWRR_CNT_SET(count) | + QSYS_SE_CFG_SE_RR_ENA_SET(0), + QSYS_SE_CFG_SE_DWRR_CNT | + QSYS_SE_CFG_SE_RR_ENA, + lan966x, QSYS_SE_CFG(se_idx)); + + return 0; +} + +int lan966x_ets_del(struct lan966x_port *port, + struct tc_ets_qopt_offload *qopt) +{ + struct lan966x *lan966x = port->lan966x; + u32 se_idx; + int i; + + se_idx = SE_IDX_PORT + port->chip_port; + + for (i = 0; i < NUM_PRIO_QUEUES; ++i) + lan_wr(0, lan966x, QSYS_SE_DWRR_CFG(se_idx, i)); + + lan_rmw(QSYS_SE_CFG_SE_DWRR_CNT_SET(0) | + QSYS_SE_CFG_SE_RR_ENA_SET(0), + QSYS_SE_CFG_SE_DWRR_CNT | + QSYS_SE_CFG_SE_RR_ENA, + lan966x, QSYS_SE_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 168456f693bb7..78665eb9a3f11 100644 --- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h @@ -476,6 +476,11 @@ int lan966x_cbs_add(struct lan966x_port *port, int lan966x_cbs_del(struct lan966x_port *port, struct tc_cbs_qopt_offload *qopt); +int lan966x_ets_add(struct lan966x_port *port, + struct tc_ets_qopt_offload *qopt); +int lan966x_ets_del(struct lan966x_port *port, + struct tc_ets_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 01fa6bb680b92..4f00f95d66b68 100644 --- a/drivers/net/ethernet/microchip/lan966x/lan966x_regs.h +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_regs.h @@ -1036,6 +1036,18 @@ enum lan966x_target { /* 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_DWRR_CNT GENMASK(9, 6) +#define QSYS_SE_CFG_SE_DWRR_CNT_SET(x)\ + FIELD_PREP(QSYS_SE_CFG_SE_DWRR_CNT, x) +#define QSYS_SE_CFG_SE_DWRR_CNT_GET(x)\ + FIELD_GET(QSYS_SE_CFG_SE_DWRR_CNT, x) + +#define QSYS_SE_CFG_SE_RR_ENA BIT(5) +#define QSYS_SE_CFG_SE_RR_ENA_SET(x)\ + FIELD_PREP(QSYS_SE_CFG_SE_RR_ENA, x) +#define QSYS_SE_CFG_SE_RR_ENA_GET(x)\ + FIELD_GET(QSYS_SE_CFG_SE_RR_ENA, x) + #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) @@ -1048,6 +1060,14 @@ enum lan966x_target { #define QSYS_SE_CFG_SE_FRM_MODE_GET(x)\ FIELD_GET(QSYS_SE_CFG_SE_FRM_MODE, x) +#define QSYS_SE_DWRR_CFG(g, r) __REG(TARGET_QSYS, 0, 1, 16384, g, 90, 128, 12, r, 12, 4) + +#define QSYS_SE_DWRR_CFG_DWRR_COST GENMASK(4, 0) +#define QSYS_SE_DWRR_CFG_DWRR_COST_SET(x)\ + FIELD_PREP(QSYS_SE_DWRR_CFG_DWRR_COST, x) +#define QSYS_SE_DWRR_CFG_DWRR_COST_GET(x)\ + FIELD_GET(QSYS_SE_DWRR_CFG_DWRR_COST, 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_tc.c b/drivers/net/ethernet/microchip/lan966x/lan966x_tc.c index 4b05535c9e029..336eb7ee0d608 100644 --- a/drivers/net/ethernet/microchip/lan966x/lan966x_tc.c +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_tc.c @@ -44,6 +44,21 @@ static int lan966x_tc_setup_qdisc_cbs(struct lan966x_port *port, lan966x_cbs_del(port, qopt); } +static int lan966x_tc_setup_qdisc_ets(struct lan966x_port *port, + struct tc_ets_qopt_offload *qopt) +{ + switch (qopt->command) { + case TC_ETS_REPLACE: + return lan966x_ets_add(port, qopt); + case TC_ETS_DESTROY: + return lan966x_ets_del(port, qopt); + default: + return -EOPNOTSUPP; + }; + + return -EOPNOTSUPP; +} + int lan966x_tc_setup(struct net_device *dev, enum tc_setup_type type, void *type_data) { @@ -58,6 +73,8 @@ int lan966x_tc_setup(struct net_device *dev, enum tc_setup_type type, return lan966x_tc_setup_qdisc_tbf(port, type_data); case TC_SETUP_QDISC_CBS: return lan966x_tc_setup_qdisc_cbs(port, type_data); + case TC_SETUP_QDISC_ETS: + return lan966x_tc_setup_qdisc_ets(port, type_data); default: return -EOPNOTSUPP; } -- 2.39.5