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43 lines
1.4 KiB
Diff
43 lines
1.4 KiB
Diff
From: Felix Fietkau <nbd@nbd.name>
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Date: Wed, 29 Mar 2023 16:02:54 +0200
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Subject: [PATCH] net: ethernet: mtk_eth_soc: fix remaining throughput
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regression
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Based on further tests, it seems that the QDMA shaper is not able to
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perform shaping close to the MAC link rate without throughput loss.
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This cannot be compensated by increasing the shaping rate, so it seems
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to be an internal limit.
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Fix the remaining throughput regression by detecting that condition and
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limiting shaping to ports with lower link speed.
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This patch intentionally ignores link speed gain from TRGMII, because
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even on such links, shaping to 1000 Mbit/s incurs some throughput
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degradation.
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Fixes: f63959c7eec3 ("net: ethernet: mtk_eth_soc: implement multi-queue support for per-port queues")
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Reported-by: Frank Wunderlich <frank-w@public-files.de>
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
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+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
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@@ -724,6 +724,7 @@ static void mtk_mac_link_up(struct phyli
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MAC_MCR_FORCE_RX_FC);
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/* Configure speed */
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+ mac->speed = speed;
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switch (speed) {
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case SPEED_2500:
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case SPEED_1000:
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@@ -3293,6 +3294,9 @@ found:
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if (dp->index >= MTK_QDMA_NUM_QUEUES)
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return NOTIFY_DONE;
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+ if (mac->speed > 0 && mac->speed <= s.base.speed)
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+ s.base.speed = 0;
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+
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mtk_set_queue_speed(eth, dp->index + 3, s.base.speed);
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return NOTIFY_DONE;
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