diff options
Diffstat (limited to 'target/linux/generic/pending-5.15/732-10-net-ethernet-mtk_eth_soc-work-around-issue-with-send.patch')
| -rw-r--r-- | target/linux/generic/pending-5.15/732-10-net-ethernet-mtk_eth_soc-work-around-issue-with-send.patch | 46 |
1 files changed, 31 insertions, 15 deletions
diff --git a/target/linux/generic/pending-5.15/732-10-net-ethernet-mtk_eth_soc-work-around-issue-with-send.patch b/target/linux/generic/pending-5.15/732-10-net-ethernet-mtk_eth_soc-work-around-issue-with-send.patch index ba86686eeb..86ce481c2e 100644 --- a/target/linux/generic/pending-5.15/732-10-net-ethernet-mtk_eth_soc-work-around-issue-with-send.patch +++ b/target/linux/generic/pending-5.15/732-10-net-ethernet-mtk_eth_soc-work-around-issue-with-send.patch @@ -1,12 +1,15 @@ From: Felix Fietkau <nbd@nbd.name> Date: Thu, 3 Nov 2022 12:38:49 +0100 -Subject: [PATCH] net: ethernet: mtk_eth_soc: work around issue with - sending small fragments +Subject: [PATCH] net: ethernet: mtk_eth_soc: work around issue with sending + small fragments -When frames are sent with very small fragments, the DMA engine appears to -lock up and transmit attempts time out. Fix this by detecting the presence -of small fragments and use skb_gso_segment + skb_linearize to deal with -them +When lots of frames are sent with a number of very small fragments, an +internal FIFO can overflow, causing the DMA engine to lock up lock up and +transmit attempts time out. + +Fix this on MT7986 by increasing the reserved FIFO space. +Fix this on older chips by detecting the presence of small fragments and use +skb_gso_segment + skb_linearize to deal with them. Signed-off-by: Felix Fietkau <nbd@nbd.name> --- @@ -42,11 +45,12 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name> bool gso = false; int tx_num; -@@ -1423,6 +1439,17 @@ static netdev_tx_t mtk_start_xmit(struct +@@ -1423,6 +1439,18 @@ static netdev_tx_t mtk_start_xmit(struct return NETDEV_TX_BUSY; } -+ if (skb_is_gso(skb) && mtk_skb_has_small_frag(skb)) { ++ if (!MTK_HAS_CAPS(eth->soc->caps, MTK_NETSYS_V2) && ++ skb_is_gso(skb) && mtk_skb_has_small_frag(skb)) { + segs = skb_gso_segment(skb, dev->features & ~NETIF_F_ALL_TSO); + if (IS_ERR(segs)) + goto drop; @@ -60,19 +64,31 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name> /* TSO: fill MSS info in tcp checksum field */ if (skb_is_gso(skb)) { if (skb_cow_head(skb, 0)) { -@@ -1438,8 +1465,13 @@ static netdev_tx_t mtk_start_xmit(struct +@@ -1438,8 +1466,14 @@ static netdev_tx_t mtk_start_xmit(struct } } - if (mtk_tx_map(skb, dev, tx_num, ring, gso) < 0) - goto drop; -+ skb_list_walk_safe(skb, skb, next) { -+ if ((mtk_skb_has_small_frag(skb) && skb_linearize(skb)) || -+ mtk_tx_map(skb, dev, tx_num, ring, gso) < 0) { -+ stats->tx_dropped++; -+ dev_kfree_skb_any(skb); ++ if (!MTK_HAS_CAPS(eth->soc->caps, MTK_NETSYS_V2)) ++ skb_list_walk_safe(skb, skb, next) { ++ if ((mtk_skb_has_small_frag(skb) && skb_linearize(skb)) || ++ mtk_tx_map(skb, dev, tx_num, ring, gso) < 0) { ++ stats->tx_dropped++; ++ dev_kfree_skb_any(skb); ++ } + } -+ } if (unlikely(atomic_read(&ring->free_count) <= ring->thresh)) netif_tx_stop_all_queues(dev); +--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h ++++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h +@@ -246,7 +246,7 @@ + #define MTK_CHK_DDONE_EN BIT(28) + #define MTK_DMAD_WR_WDONE BIT(26) + #define MTK_WCOMP_EN BIT(24) +-#define MTK_RESV_BUF (0x40 << 16) ++#define MTK_RESV_BUF (0x80 << 16) + #define MTK_MUTLI_CNT (0x4 << 12) + #define MTK_LEAKY_BUCKET_EN BIT(11) + |