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f3d2829b51
Backport a bunch of fixes and improvements for WED and PPE, mostly for MT7988. Signed-off-by: Daniel Golle <daniel@makrotopia.org>
103 lines
2.8 KiB
Diff
103 lines
2.8 KiB
Diff
From: Felix Fietkau <nbd@nbd.name>
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Date: Thu, 3 Nov 2022 12:38:49 +0100
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Subject: [PATCH] net: ethernet: mtk_eth_soc: work around issue with sending
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small fragments
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When lots of frames are sent with a number of very small fragments, an
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internal FIFO can overflow, causing the DMA engine to lock up lock up and
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transmit attempts time out.
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Fix this on MT7986 by increasing the reserved FIFO space.
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Fix this on older chips by detecting the presence of small fragments and use
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skb_gso_segment + skb_linearize to deal with them.
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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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@@ -26,6 +26,7 @@
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#include <linux/bitfield.h>
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#include <net/dsa.h>
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#include <net/dst_metadata.h>
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+#include <net/gso.h>
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#include <net/page_pool/helpers.h>
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#include "mtk_eth_soc.h"
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@@ -1581,12 +1582,28 @@ static void mtk_wake_queue(struct mtk_et
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}
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}
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+static bool mtk_skb_has_small_frag(struct sk_buff *skb)
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+{
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+ int min_size = 16;
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+ int i;
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+
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+ if (skb_headlen(skb) < min_size)
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+ return true;
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+
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+ for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
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+ if (skb_frag_size(&skb_shinfo(skb)->frags[i]) < min_size)
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+ return true;
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+
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+ return false;
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+}
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+
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static netdev_tx_t mtk_start_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct mtk_mac *mac = netdev_priv(dev);
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struct mtk_eth *eth = mac->hw;
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struct mtk_tx_ring *ring = ð->tx_ring;
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struct net_device_stats *stats = &dev->stats;
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+ struct sk_buff *segs, *next;
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bool gso = false;
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int tx_num;
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@@ -1608,6 +1625,18 @@ static netdev_tx_t mtk_start_xmit(struct
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return NETDEV_TX_BUSY;
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}
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+ if (mtk_is_netsys_v1(eth) &&
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+ skb_is_gso(skb) && mtk_skb_has_small_frag(skb)) {
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+ segs = skb_gso_segment(skb, dev->features & ~NETIF_F_ALL_TSO);
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+ if (IS_ERR(segs))
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+ goto drop;
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+
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+ if (segs) {
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+ consume_skb(skb);
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+ skb = segs;
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+ }
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+ }
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+
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/* TSO: fill MSS info in tcp checksum field */
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if (skb_is_gso(skb)) {
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if (skb_cow_head(skb, 0)) {
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@@ -1623,8 +1652,14 @@ static netdev_tx_t mtk_start_xmit(struct
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}
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}
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- if (mtk_tx_map(skb, dev, tx_num, ring, gso) < 0)
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- goto drop;
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+ skb_list_walk_safe(skb, skb, next) {
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+ if ((mtk_is_netsys_v1(eth) &&
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+ mtk_skb_has_small_frag(skb) && skb_linearize(skb)) ||
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+ mtk_tx_map(skb, dev, tx_num, ring, gso) < 0) {
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+ stats->tx_dropped++;
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+ dev_kfree_skb_any(skb);
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+ }
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+ }
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if (unlikely(atomic_read(&ring->free_count) <= ring->thresh))
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netif_tx_stop_all_queues(dev);
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--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
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+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
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@@ -268,7 +268,7 @@
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#define MTK_CHK_DDONE_EN BIT(28)
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#define MTK_DMAD_WR_WDONE BIT(26)
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#define MTK_WCOMP_EN BIT(24)
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-#define MTK_RESV_BUF (0x40 << 16)
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+#define MTK_RESV_BUF (0x80 << 16)
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#define MTK_MUTLI_CNT (0x4 << 12)
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#define MTK_LEAKY_BUCKET_EN BIT(11)
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