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net: stmmac: replace priv->speed with the portTransmitRate from the tc-cbs parameters

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The current cbs parameter depends on speed after uplinking,
which is not needed and will report a configuration error
if the port is not initially connected. The UAPI exposed by
tc-cbs requires userspace to recalculate the send slope anyway,
because the formula depends on port_transmit_rate (see man tc-cbs),
which is not an invariant from tc's perspective. Therefore, we
use offload->sendslope and offload->idleslope to derive the
original port_transmit_rate from the CBS formula.

Fixes: 1f705bc61a ("net: stmmac: Add support for CBS QDISC")
Signed-off-by: Xiaolei Wang <xiaolei.wang@windriver.com>
Reviewed-by: Wojciech Drewek <wojciech.drewek@intel.com>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Link: https://lore.kernel.org/r/20240608143524.2065736-1-xiaolei.wang@windriver.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Xiaolei Wang 2024-06-08 22:35:24 +08:00 committed by Jakub Kicinski
parent 1b9f756344
commit be27b89652
1 changed files with 11 additions and 14 deletions
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25
drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
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@ -343,10 +343,11 @@ static int tc_setup_cbs(struct stmmac_priv *priv,
struct tc_cbs_qopt_offload *qopt)
{
u32 tx_queues_count = priv->plat->tx_queues_to_use;
s64 port_transmit_rate_kbps;
u32 queue = qopt->queue;
u32 ptr, speed_div;
u32 mode_to_use;
u64 value;
u32 ptr;
int ret;
/* Queue 0 is not AVB capable */
@ -355,30 +356,26 @@ static int tc_setup_cbs(struct stmmac_priv *priv,
if (!priv->dma_cap.av)
return -EOPNOTSUPP;
port_transmit_rate_kbps = qopt->idleslope - qopt->sendslope;
/* Port Transmit Rate and Speed Divider */
switch (priv->speed) {
switch (div_s64(port_transmit_rate_kbps, 1000)) {
case SPEED_10000:
ptr = 32;
speed_div = 10000000;
break;
case SPEED_5000:
ptr = 32;
speed_div = 5000000;
break;
case SPEED_2500:
ptr = 8;
speed_div = 2500000;
break;
case SPEED_1000:
ptr = 8;
speed_div = 1000000;
break;
case SPEED_100:
ptr = 4;
speed_div = 100000;
break;
default:
return -EOPNOTSUPP;
netdev_err(priv->dev,
"Invalid portTransmitRate %lld (idleSlope - sendSlope)\n",
port_transmit_rate_kbps);
return -EINVAL;
}
mode_to_use = priv->plat->tx_queues_cfg[queue].mode_to_use;
@ -398,10 +395,10 @@ static int tc_setup_cbs(struct stmmac_priv *priv,
}
/* Final adjustments for HW */
value = div_s64(qopt->idleslope * 1024ll * ptr, speed_div);
value = div_s64(qopt->idleslope * 1024ll * ptr, port_transmit_rate_kbps);
priv->plat->tx_queues_cfg[queue].idle_slope = value & GENMASK(31, 0);
value = div_s64(-qopt->sendslope * 1024ll * ptr, speed_div);
value = div_s64(-qopt->sendslope * 1024ll * ptr, port_transmit_rate_kbps);
priv->plat->tx_queues_cfg[queue].send_slope = value & GENMASK(31, 0);
value = qopt->hicredit * 1024ll * 8;