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21ce14a8e7
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@microchip.com> Signed-off-by: David S. Miller <davem@davemloft.net>
70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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#include "lan966x_main.h"
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int lan966x_cbs_add(struct lan966x_port *port,
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struct tc_cbs_qopt_offload *qopt)
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{
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struct lan966x *lan966x = port->lan966x;
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u32 cir, cbs;
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u8 se_idx;
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/* Check for invalid values */
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if (qopt->idleslope <= 0 ||
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qopt->sendslope >= 0 ||
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qopt->locredit >= qopt->hicredit)
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return -EINVAL;
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se_idx = SE_IDX_QUEUE + port->chip_port * NUM_PRIO_QUEUES + qopt->queue;
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cir = qopt->idleslope;
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cbs = (qopt->idleslope - qopt->sendslope) *
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(qopt->hicredit - qopt->locredit) /
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-qopt->sendslope;
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/* Rate unit is 100 kbps */
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cir = DIV_ROUND_UP(cir, 100);
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/* Avoid using zero rate */
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cir = cir ?: 1;
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/* Burst unit is 4kB */
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cbs = DIV_ROUND_UP(cbs, 4096);
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/* Avoid using zero burst */
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cbs = cbs ?: 1;
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/* Check that actually the result can be written */
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if (cir > GENMASK(15, 0) ||
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cbs > GENMASK(6, 0))
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return -EINVAL;
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lan_rmw(QSYS_SE_CFG_SE_AVB_ENA_SET(1) |
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QSYS_SE_CFG_SE_FRM_MODE_SET(1),
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QSYS_SE_CFG_SE_AVB_ENA |
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QSYS_SE_CFG_SE_FRM_MODE,
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lan966x, QSYS_SE_CFG(se_idx));
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lan_wr(QSYS_CIR_CFG_CIR_RATE_SET(cir) |
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QSYS_CIR_CFG_CIR_BURST_SET(cbs),
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lan966x, QSYS_CIR_CFG(se_idx));
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return 0;
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}
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int lan966x_cbs_del(struct lan966x_port *port,
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struct tc_cbs_qopt_offload *qopt)
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{
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struct lan966x *lan966x = port->lan966x;
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u8 se_idx;
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se_idx = SE_IDX_QUEUE + port->chip_port * NUM_PRIO_QUEUES + qopt->queue;
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lan_rmw(QSYS_SE_CFG_SE_AVB_ENA_SET(1) |
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QSYS_SE_CFG_SE_FRM_MODE_SET(0),
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QSYS_SE_CFG_SE_AVB_ENA |
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QSYS_SE_CFG_SE_FRM_MODE,
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lan966x, QSYS_SE_CFG(se_idx));
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lan_wr(QSYS_CIR_CFG_CIR_RATE_SET(0) |
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QSYS_CIR_CFG_CIR_BURST_SET(0),
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lan966x, QSYS_CIR_CFG(se_idx));
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return 0;
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}
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