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net/sched: taprio: dynamic max_sdu larger than the max_mtu is unlimited
It makes no sense to keep randomly large max_sdu values, especially if larger than the device's max_mtu. These are visible in "tc qdisc show". Such a max_sdu is practically unlimited and will cause no packets for that traffic class to be dropped on enqueue. Just set max_sdu_dynamic to U32_MAX, which in the logic below causes taprio to save a max_frm_len of U32_MAX and a max_sdu presented to user space of 0 (unlimited). Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Kurt Kanzenbach <kurt@linutronix.de> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
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@ -288,6 +288,8 @@ static void taprio_update_queue_max_sdu(struct taprio_sched *q,
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dev->hard_header_len + 1);
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}
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max_sdu_dynamic = max_frm_len - dev->hard_header_len;
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if (max_sdu_dynamic > dev->max_mtu)
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max_sdu_dynamic = U32_MAX;
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}
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max_sdu = min(max_sdu_dynamic, max_sdu_from_user);
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