kernel: backport mtk_soc_eth fixes from v5.13

Fixes logic that leads to this error when booting mt7621 and other
devices that use the mediatek ethernet driver:
  [   23.144378] mtk_soc_eth 1e100000.ethernet: PPE table busy

The rest are mostly moved from pending-5.10 to backport-5.10 with a
couple of cleanups and improvements from upstream.

Refresh patches.

Links:
    https://git.kernel.org/netdev/net-next/c/c5d66587b890
    https://git.kernel.org/netdev/net-next/c/3f57d8c40fea
    https://git.kernel.org/netdev/net-next/c/5196c4178549
    https://git.kernel.org/netdev/net-next/c/787082ab9f7b
    https://git.kernel.org/netdev/net-next/c/c30c4a827390
    https://git.kernel.org/netdev/net-next/c/3630d519d7c3
    https://git.kernel.org/netdev/net-next/c/16ef670789b2
    https://git.kernel.org/netdev/net-next/c/59555a8d0dd3
    https://git.kernel.org/netdev/net-next/c/6b4423b258b9
    https://git.kernel.org/netdev/net-next/c/e9229ffd550b
    https://git.kernel.org/netdev/net-next/c/4e6bf609569c
    https://git.kernel.org/netdev/net-next/c/816ac3e6e67b
    https://git.kernel.org/netdev/net-next/c/16769a8923fa
    https://git.kernel.org/netdev/net-next/c/db2c7b353db3
    https://git.kernel.org/netdev/net-next/c/fa817272c37e
    https://git.kernel.org/netdev/net-next/c/3bc8e0aff23b

Fixes: f07fe36f22fc ("kernel: update flow offload patches to upstream version")
Cc: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>

1 files changed, 110 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.10/610-v5.13-49-net-ethernet-mtk_eth_soc-rework-NAPI-callbacks.patch b/target/linux/generic/backport-5.10/610-v5.13-49-net-ethernet-mtk_eth_soc-rework-NAPI-callbacks.patch
new file mode 100644
index 0000000000..9bc948015d
--- /dev/null
+++ b/target/linux/generic/backport-5.10/610-v5.13-49-net-ethernet-mtk_eth_soc-rework-NAPI-callbacks.patch
@@ -0,0 +1,110 @@
+From db2c7b353db3b3f71b55f9ff4627d8a786446fbe Mon Sep 17 00:00:00 2001
+From: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
+Date: Thu, 22 Apr 2021 22:21:06 -0700
+Subject: [PATCH] net: ethernet: mtk_eth_soc: rework NAPI callbacks
+
+Use napi_complete_done to communicate total TX and RX work done to NAPI.
+Count total RX work up instead of remaining work down for clarity.
+Remove unneeded local variables for clarity. Use do {} while instead of
+goto for clarity.
+
+Suggested-by: Jakub Kicinski <kuba@kernel.org>
+Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ drivers/net/ethernet/mediatek/mtk_eth_soc.c | 54 +++++++++------------
+ 1 file changed, 24 insertions(+), 30 deletions(-)
+
+--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
++++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+@@ -1496,7 +1496,6 @@ static void mtk_handle_status_irq(struct
+ static int mtk_napi_tx(struct napi_struct *napi, int budget)
+ {
+ 	struct mtk_eth *eth = container_of(napi, struct mtk_eth, tx_napi);
+-	u32 status, mask;
+ 	int tx_done = 0;
+ 
+ 	if (MTK_HAS_CAPS(eth->soc->caps, MTK_QDMA))
+@@ -1505,21 +1504,19 @@ static int mtk_napi_tx(struct napi_struc
+ 	tx_done = mtk_poll_tx(eth, budget);
+ 
+ 	if (unlikely(netif_msg_intr(eth))) {
+-		status = mtk_r32(eth, eth->tx_int_status_reg);
+-		mask = mtk_r32(eth, eth->tx_int_mask_reg);
+ 		dev_info(eth->dev,
+-			 "done tx %d, intr 0x%08x/0x%x\n",
+-			 tx_done, status, mask);
++			 "done tx %d, intr 0x%08x/0x%x\n", tx_done,
++			 mtk_r32(eth, eth->tx_int_status_reg),
++			 mtk_r32(eth, eth->tx_int_mask_reg));
+ 	}
+ 
+ 	if (tx_done == budget)
+ 		return budget;
+ 
+-	status = mtk_r32(eth, eth->tx_int_status_reg);
+-	if (status & MTK_TX_DONE_INT)
++	if (mtk_r32(eth, eth->tx_int_status_reg) & MTK_TX_DONE_INT)
+ 		return budget;
+ 
+-	if (napi_complete(napi))
++	if (napi_complete_done(napi, tx_done))
+ 		mtk_tx_irq_enable(eth, MTK_TX_DONE_INT);
+ 
+ 	return tx_done;
+@@ -1528,36 +1525,33 @@ static int mtk_napi_tx(struct napi_struc
+ static int mtk_napi_rx(struct napi_struct *napi, int budget)
+ {
+ 	struct mtk_eth *eth = container_of(napi, struct mtk_eth, rx_napi);
+-	u32 status, mask;
+-	int rx_done = 0;
+-	int remain_budget = budget;
++	int rx_done_total = 0;
+ 
+ 	mtk_handle_status_irq(eth);
+ 
+-poll_again:
+-	mtk_w32(eth, MTK_RX_DONE_INT, MTK_PDMA_INT_STATUS);
+-	rx_done = mtk_poll_rx(napi, remain_budget, eth);
++	do {
++		int rx_done;
+ 
+-	if (unlikely(netif_msg_intr(eth))) {
+-		status = mtk_r32(eth, MTK_PDMA_INT_STATUS);
+-		mask = mtk_r32(eth, MTK_PDMA_INT_MASK);
+-		dev_info(eth->dev,
+-			 "done rx %d, intr 0x%08x/0x%x\n",
+-			 rx_done, status, mask);
+-	}
+-	if (rx_done == remain_budget)
+-		return budget;
++		mtk_w32(eth, MTK_RX_DONE_INT, MTK_PDMA_INT_STATUS);
++		rx_done = mtk_poll_rx(napi, budget - rx_done_total, eth);
++		rx_done_total += rx_done;
++
++		if (unlikely(netif_msg_intr(eth))) {
++			dev_info(eth->dev,
++				 "done rx %d, intr 0x%08x/0x%x\n", rx_done,
++				 mtk_r32(eth, MTK_PDMA_INT_STATUS),
++				 mtk_r32(eth, MTK_PDMA_INT_MASK));
++		}
+ 
+-	status = mtk_r32(eth, MTK_PDMA_INT_STATUS);
+-	if (status & MTK_RX_DONE_INT) {
+-		remain_budget -= rx_done;
+-		goto poll_again;
+-	}
++		if (rx_done_total == budget)
++			return budget;
++
++	} while (mtk_r32(eth, MTK_PDMA_INT_STATUS) & MTK_RX_DONE_INT);
+ 
+-	if (napi_complete(napi))
++	if (napi_complete_done(napi, rx_done_total))
+ 		mtk_rx_irq_enable(eth, MTK_RX_DONE_INT);
+ 
+-	return rx_done + budget - remain_budget;
++	return rx_done_total;
+ }
+ 
+ static int mtk_tx_alloc(struct mtk_eth *eth)