1// SPDX-License-Identifier: GPL-2.0+
2
3#include "lan966x_main.h"
4
5int lan966x_cbs_add(struct lan966x_port *port,
6 struct tc_cbs_qopt_offload *qopt)
7{
8 struct lan966x *lan966x = port->lan966x;
9 u32 cir, cbs;
10 u8 se_idx;
11
12 /* Check for invalid values */
13 if (qopt->idleslope <= 0 ||
14 qopt->sendslope >= 0 ||
15 qopt->locredit >= qopt->hicredit)
16 return -EINVAL;
17
18 se_idx = SE_IDX_QUEUE + port->chip_port * NUM_PRIO_QUEUES + qopt->queue;
19 cir = qopt->idleslope;
20 cbs = (qopt->idleslope - qopt->sendslope) *
21 (qopt->hicredit - qopt->locredit) /
22 -qopt->sendslope;
23
24 /* Rate unit is 100 kbps */
25 cir = DIV_ROUND_UP(cir, 100);
26 /* Avoid using zero rate */
27 cir = cir ?: 1;
28 /* Burst unit is 4kB */
29 cbs = DIV_ROUND_UP(cbs, 4096);
30 /* Avoid using zero burst */
31 cbs = cbs ?: 1;
32
33 /* Check that actually the result can be written */
34 if (cir > GENMASK(15, 0) ||
35 cbs > GENMASK(6, 0))
36 return -EINVAL;
37
38 lan_rmw(QSYS_SE_CFG_SE_AVB_ENA_SET(1) |
39 QSYS_SE_CFG_SE_FRM_MODE_SET(1),
40 QSYS_SE_CFG_SE_AVB_ENA |
41 QSYS_SE_CFG_SE_FRM_MODE,
42 lan966x, QSYS_SE_CFG(se_idx));
43
44 lan_wr(QSYS_CIR_CFG_CIR_RATE_SET(cir) |
45 QSYS_CIR_CFG_CIR_BURST_SET(cbs),
46 lan966x, QSYS_CIR_CFG(se_idx));
47
48 return 0;
49}
50
51int lan966x_cbs_del(struct lan966x_port *port,
52 struct tc_cbs_qopt_offload *qopt)
53{
54 struct lan966x *lan966x = port->lan966x;
55 u8 se_idx;
56
57 se_idx = SE_IDX_QUEUE + port->chip_port * NUM_PRIO_QUEUES + qopt->queue;
58
59 lan_rmw(QSYS_SE_CFG_SE_AVB_ENA_SET(1) |
60 QSYS_SE_CFG_SE_FRM_MODE_SET(0),
61 QSYS_SE_CFG_SE_AVB_ENA |
62 QSYS_SE_CFG_SE_FRM_MODE,
63 lan966x, QSYS_SE_CFG(se_idx));
64
65 lan_wr(QSYS_CIR_CFG_CIR_RATE_SET(0) |
66 QSYS_CIR_CFG_CIR_BURST_SET(0),
67 lan966x, QSYS_CIR_CFG(se_idx));
68
69 return 0;
70}
71

source code of linux/drivers/net/ethernet/microchip/lan966x/lan966x_cbs.c