bcm4908: backport Ethernet driver fixes from the 5.12

The most noticeable one is fix for RX stopping on high traffic.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
(cherry picked from commit acbea54bc2)

target/linux/bcm4908/patches-5.4/073-v5.12-0009-net-broadcom-bcm4908_enet-set-MTU-on-open-on-request.patch

@@ -1,7 +1,10 @@
-From d7dfbcba0437955ccbe4c6db736526d528f27720 Mon Sep 17 00:00:00 2001
+From 14b3b46a67f78ade99eafcbf320105615e948569 Mon Sep 17 00:00:00 2001
 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
-Date: Fri, 12 Feb 2021 16:06:00 +0100
+Date: Fri, 12 Feb 2021 16:21:35 +0100
 Subject: [PATCH] net: broadcom: bcm4908_enet: set MTU on open & on request
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
 
 Hardware comes up with default max frame size set to 1518. When using it
 with switch it results in actual Ethernet MTU 1492:
@@ -13,6 +16,9 @@ traffic (MTU 1500).
 Define maximum possible Ethernet overhead and always set MAC max frame
 length accordingly. This change fixes handling Ethernet frames of length
 1506 - 1514.
+
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+Signed-off-by: David S. Miller <davem@davemloft.net>
 ---
  drivers/net/ethernet/broadcom/bcm4908_enet.c | 31 ++++++++++++++++----
  1 file changed, 25 insertions(+), 6 deletions(-)

target/linux/bcm4908/patches-5.4/073-v5.12-0010-net-broadcom-bcm4908_enet-fix-RX-path-possible-mem-l.patch

@@ -0,0 +1,30 @@
+From 4dc7f09b8becfa35a55430a49d95acf19f996e6b Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Wed, 24 Feb 2021 16:18:41 +0100
+Subject: [PATCH] net: broadcom: bcm4908_enet: fix RX path possible mem leak
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+After filling RX ring slot with new skb it's required to free old skb.
+Immediately on error or later in the net subsystem.
+
+Fixes: 4feffeadbcb2 ("net: broadcom: bcm4908enet: add BCM4908 controller driver")
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+Acked-by: Florian Fainelli <f.fainelli@gmail.com>
+Link: https://lore.kernel.org/r/20210224151842.2419-1-zajec5@gmail.com
+Signed-off-by: Jakub Kicinski <kuba@kernel.org>
+---
+ drivers/net/ethernet/broadcom/bcm4908_enet.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+--- a/drivers/net/ethernet/broadcom/bcm4908_enet.c
++++ b/drivers/net/ethernet/broadcom/bcm4908_enet.c
+@@ -570,6 +570,7 @@ static int bcm4908_enet_poll(struct napi
+ 
+ 		if (len < ETH_ZLEN ||
+ 		    (ctl & (DMA_CTL_STATUS_SOP | DMA_CTL_STATUS_EOP)) != (DMA_CTL_STATUS_SOP | DMA_CTL_STATUS_EOP)) {
++			kfree_skb(slot.skb);
+ 			enet->netdev->stats.rx_dropped++;
+ 			break;
+ 		}

target/linux/bcm4908/patches-5.4/073-v5.12-0011-net-broadcom-bcm4908_enet-fix-NAPI-poll-returned-val.patch

@@ -0,0 +1,31 @@
+From 4d9274cee40b6a20dd6148c6c81c6733c2678cbc Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Wed, 24 Feb 2021 16:18:42 +0100
+Subject: [PATCH] net: broadcom: bcm4908_enet: fix NAPI poll returned value
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Missing increment was resulting in poll function always returning 0
+instead of amount of processed packets.
+
+Fixes: 4feffeadbcb2 ("net: broadcom: bcm4908enet: add BCM4908 controller driver")
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+Acked-by: Florian Fainelli <f.fainelli@gmail.com>
+Link: https://lore.kernel.org/r/20210224151842.2419-2-zajec5@gmail.com
+Signed-off-by: Jakub Kicinski <kuba@kernel.org>
+---
+ drivers/net/ethernet/broadcom/bcm4908_enet.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+--- a/drivers/net/ethernet/broadcom/bcm4908_enet.c
++++ b/drivers/net/ethernet/broadcom/bcm4908_enet.c
+@@ -583,6 +583,8 @@ static int bcm4908_enet_poll(struct napi
+ 
+ 		enet->netdev->stats.rx_packets++;
+ 		enet->netdev->stats.rx_bytes += len;
++
++		handled++;
+ 	}
+ 
+ 	if (handled < weight) {

target/linux/bcm4908/patches-5.4/073-v5.12-0012-net-broadcom-bcm4908_enet-enable-RX-after-processing.patch

@@ -0,0 +1,34 @@
+From d313d16bbaea0f11a2e98f04a6c678b43c208915 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Fri, 26 Feb 2021 14:20:38 +0100
+Subject: [PATCH] net: broadcom: bcm4908_enet: enable RX after processing
+ packets
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+When receiving a lot of packets hardware may run out of free
+descriptiors and stop RX ring. Enable it every time after handling
+received packets.
+
+Fixes: 4feffeadbcb2 ("net: broadcom: bcm4908enet: add BCM4908 controller driver")
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+Acked-by: Florian Fainelli <f.fainelli@gmail.com>
+Link: https://lore.kernel.org/r/20210226132038.29849-1-zajec5@gmail.com
+Signed-off-by: Jakub Kicinski <kuba@kernel.org>
+---
+ drivers/net/ethernet/broadcom/bcm4908_enet.c | 3 +++
+ 1 file changed, 3 insertions(+)
+
+--- a/drivers/net/ethernet/broadcom/bcm4908_enet.c
++++ b/drivers/net/ethernet/broadcom/bcm4908_enet.c
+@@ -592,6 +592,9 @@ static int bcm4908_enet_poll(struct napi
+ 		bcm4908_enet_intrs_on(enet);
+ 	}
+ 
++	/* Hardware could disable ring if it run out of descriptors */
++	bcm4908_enet_dma_rx_ring_enable(enet, &enet->rx_ring);
++
+ 	return handled;
+ }
+