From 69f6fc7b15875e7657cd56ef69731cde41f677a0 Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Mon, 8 Jun 2020 19:00:02 +0200 Subject: [PATCH] ramips: add mt7621 ethernet driver improvements - Speed up MDIO bus access - Improve performance on tx completion Signed-off-by: Felix Fietkau --- ...hernet-mediatek-use-napi_consume_skb.patch | 72 +++++++++++++++++++ ...iatek-significantly-reduce-mdio-bus-.patch | 26 +++++++ 2 files changed, 98 insertions(+) create mode 100644 target/linux/ramips/patches-5.4/0400-net-ethernet-mediatek-use-napi_consume_skb.patch create mode 100644 target/linux/ramips/patches-5.4/0401-net-ethernet-mediatek-significantly-reduce-mdio-bus-.patch diff --git a/target/linux/ramips/patches-5.4/0400-net-ethernet-mediatek-use-napi_consume_skb.patch b/target/linux/ramips/patches-5.4/0400-net-ethernet-mediatek-use-napi_consume_skb.patch new file mode 100644 index 0000000000..1ccb85d4b4 --- /dev/null +++ b/target/linux/ramips/patches-5.4/0400-net-ethernet-mediatek-use-napi_consume_skb.patch @@ -0,0 +1,72 @@ +From: Felix Fietkau +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 +--- + +--- 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; + } diff --git a/target/linux/ramips/patches-5.4/0401-net-ethernet-mediatek-significantly-reduce-mdio-bus-.patch b/target/linux/ramips/patches-5.4/0401-net-ethernet-mediatek-significantly-reduce-mdio-bus-.patch new file mode 100644 index 0000000000..c2ba9964e9 --- /dev/null +++ b/target/linux/ramips/patches-5.4/0401-net-ethernet-mediatek-significantly-reduce-mdio-bus-.patch @@ -0,0 +1,26 @@ +From: Felix Fietkau +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 +--- + +--- 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"); -- 2.25.1