[PATCH v1 net-next 3/3] net: dsa: felix: add support Credit Based Shaper(CBS) for hardware offload

[Xiaoliang Yang]

VSC9959 hardware support the Credit Based Shaper(CBS) which part
of the IEEE-802.1Qav. This patch support sch_cbs set for VSC9959.

Signed-off-by: Xiaoliang Yang <xiaoliang.yan...@nxp.com>
---
 drivers/net/dsa/ocelot/felix_vsc9959.c | 52 +++++++++++++++++++++++++-
 1 file changed, 51 insertions(+), 1 deletion(-)

diff --git a/drivers/net/dsa/ocelot/felix_vsc9959.c 
b/drivers/net/dsa/ocelot/felix_vsc9959.c
index ccbd875c7a47..d8d1657ee8ba 100644
--- a/drivers/net/dsa/ocelot/felix_vsc9959.c
+++ b/drivers/net/dsa/ocelot/felix_vsc9959.c
@@ -208,7 +208,7 @@ static const u32 vsc9959_qsys_regmap[] = {
        REG(QSYS_QMAXSDU_CFG_6,                 0x00f62c),
        REG(QSYS_QMAXSDU_CFG_7,                 0x00f648),
        REG(QSYS_PREEMPTION_CFG,                0x00f664),
-       REG_RESERVED(QSYS_CIR_CFG),
+       REG(QSYS_CIR_CFG,                       0x000000),
        REG(QSYS_EIR_CFG,                       0x000004),
        REG(QSYS_SE_CFG,                        0x000008),
        REG(QSYS_SE_DWRR_CFG,                   0x00000c),
@@ -1354,6 +1354,54 @@ static int vsc9959_qos_port_tas_set(struct ocelot 
*ocelot, int port,
        return ret;
 }
 
+int vsc9959_qos_port_cbs_set(struct dsa_switch *ds, int port,
+                            struct tc_cbs_qopt_offload *cbs_qopt)
+{
+       struct ocelot *ocelot = ds->priv;
+       int port_ix = port * 8 + cbs_qopt->queue;
+       u32 cbs = 0;
+       u32 cir = 0;
+
+       if (cbs_qopt->queue >= ds->num_tx_queues)
+               return -EINVAL;
+
+       if (!cbs_qopt->enable) {
+               ocelot_write_gix(ocelot, QSYS_CIR_CFG_CIR_RATE(0) |
+                                QSYS_CIR_CFG_CIR_BURST(0),
+                                QSYS_CIR_CFG, port_ix);
+
+               ocelot_rmw_gix(ocelot, 0, QSYS_SE_CFG_SE_AVB_ENA,
+                              QSYS_SE_CFG, port_ix);
+
+               return 0;
+       }
+
+       /* Rate unit is 100 kbps */
+       cir = DIV_ROUND_UP(cbs_qopt->idleslope, 100);
+       cir = (cir ? cir : 1);
+       cir = min_t(u32, GENMASK(14, 0), cir);
+       /* Burst unit is 4kB */
+       cbs = DIV_ROUND_UP(cbs_qopt->hicredit, 4096);
+       /* Avoid using zero burst size */
+       cbs = (cbs ? cbs : 1);
+       cbs = min_t(u32, GENMASK(5, 0), cbs);
+       ocelot_write_gix(ocelot,
+                        QSYS_CIR_CFG_CIR_RATE(cir) |
+                        QSYS_CIR_CFG_CIR_BURST(cbs),
+                        QSYS_CIR_CFG,
+                        port_ix);
+
+       ocelot_rmw_gix(ocelot,
+                      QSYS_SE_CFG_SE_FRM_MODE(0) |
+                      QSYS_SE_CFG_SE_AVB_ENA,
+                      QSYS_SE_CFG_SE_AVB_ENA |
+                      QSYS_SE_CFG_SE_FRM_MODE_M,
+                      QSYS_SE_CFG,
+                      port_ix);
+
+       return 0;
+}
+
 static int vsc9959_port_setup_tc(struct dsa_switch *ds, int port,
                                 enum tc_setup_type type,
                                 void *type_data)
@@ -1363,6 +1411,8 @@ static int vsc9959_port_setup_tc(struct dsa_switch *ds, 
int port,
        switch (type) {
        case TC_SETUP_QDISC_TAPRIO:
                return vsc9959_qos_port_tas_set(ocelot, port, type_data);
+       case TC_SETUP_QDISC_CBS:
+               return vsc9959_qos_port_cbs_set(ds, port, type_data);
        default:
                return -EOPNOTSUPP;
        }
-- 
2.17.1