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ramips: add mt7621 ethernet driver improvements

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- Speed up MDIO bus access
- Improve performance on tx completion

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2020-06-08 19:00:02 +02:00
parent 2c82862068
commit 69f6fc7b15
2 changed files with 98 additions and 0 deletions
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72
target/linux/ramips/patches-5.4/0400-net-ethernet-mediatek-use-napi_consume_skb.patch Normal file
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@ -0,0 +1,72 @@
From: Felix Fietkau <nbd@nbd.name>
Date: Mon, 8 Jun 2020 17:01:12 +0200
Subject: [PATCH] net: ethernet: mediatek: use napi_consume_skb
Should improve performance, since it can use bulk free
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -844,7 +844,8 @@ static int txd_to_idx(struct mtk_tx_ring
return ((void *)dma - (void *)ring->dma) / sizeof(*dma);
}
-static void mtk_tx_unmap(struct mtk_eth *eth, struct mtk_tx_buf *tx_buf)
+static void mtk_tx_unmap(struct mtk_eth *eth, struct mtk_tx_buf *tx_buf,
+ bool napi)
{
if (MTK_HAS_CAPS(eth->soc->caps, MTK_QDMA)) {
if (tx_buf->flags & MTK_TX_FLAGS_SINGLE0) {
@@ -876,8 +877,12 @@ static void mtk_tx_unmap(struct mtk_eth
tx_buf->flags = 0;
if (tx_buf->skb &&
- (tx_buf->skb != (struct sk_buff *)MTK_DMA_DUMMY_DESC))
- dev_kfree_skb_any(tx_buf->skb);
+ (tx_buf->skb != (struct sk_buff *)MTK_DMA_DUMMY_DESC)) {
+ if (napi)
+ napi_consume_skb(tx_buf->skb, napi);
+ else
+ dev_kfree_skb_any(tx_buf->skb);
+ }
tx_buf->skb = NULL;
}
@@ -1055,7 +1060,7 @@ err_dma:
tx_buf = mtk_desc_to_tx_buf(ring, itxd);
/* unmap dma */
- mtk_tx_unmap(eth, tx_buf);
+ mtk_tx_unmap(eth, tx_buf, false);
itxd->txd3 = TX_DMA_LS0 | TX_DMA_OWNER_CPU;
if (!MTK_HAS_CAPS(eth->soc->caps, MTK_QDMA))
@@ -1373,7 +1378,7 @@ static int mtk_poll_tx_qdma(struct mtk_e
done[mac]++;
budget--;
}
- mtk_tx_unmap(eth, tx_buf);
+ mtk_tx_unmap(eth, tx_buf, true);
ring->last_free = desc;
atomic_inc(&ring->free_count);
@@ -1410,7 +1415,7 @@ static int mtk_poll_tx_pdma(struct mtk_e
budget--;
}
- mtk_tx_unmap(eth, tx_buf);
+ mtk_tx_unmap(eth, tx_buf, true);
desc = &ring->dma[cpu];
ring->last_free = desc;
@@ -1612,7 +1617,7 @@ static void mtk_tx_clean(struct mtk_eth
if (ring->buf) {
for (i = 0; i < MTK_DMA_SIZE; i++)
- mtk_tx_unmap(eth, &ring->buf[i]);
+ mtk_tx_unmap(eth, &ring->buf[i], false);
kfree(ring->buf);
ring->buf = NULL;
}

26
target/linux/ramips/patches-5.4/0401-net-ethernet-mediatek-significantly-reduce-mdio-bus-.patch Normal file
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@ -0,0 +1,26 @@
From: Felix Fietkau <nbd@nbd.name>
Date: Mon, 8 Jun 2020 17:02:39 +0200
Subject: [PATCH] net: ethernet: mediatek: significantly reduce mdio bus
access latency
usleep_range often ends up sleeping much longer than the 10-20us provided
as a range here. This causes significant latency in mdio bus acceses,
which easily adds multiple seconds to the boot time on MT7621 when polling
DSA slave ports.
Use cond_resched instead of usleep_range, since the MDIO access does not
take much time
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -85,7 +85,7 @@ static int mtk_mdio_busy_wait(struct mtk
return 0;
if (time_after(jiffies, t_start + PHY_IAC_TIMEOUT))
break;
- usleep_range(10, 20);
+ cond_resched();
}
dev_err(eth->dev, "mdio: MDIO timeout\n");