From acbea54bc29a22d8fb171bc9da0f1b16fb0ec233 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
Date: Mon, 1 Mar 2021 08:14:49 +0100
Subject: bcm4908: backport Ethernet driver fixes from the 5.12
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The most noticeable one is fix for RX stopping on high traffic.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
---
...m-bcm4908_enet-set-MTU-on-open-on-request.patch | 113 ---------------------
1 file changed, 113 deletions(-)
delete mode 100644 target/linux/bcm4908/patches-5.4/170-net-broadcom-bcm4908_enet-set-MTU-on-open-on-request.patch
(limited to 'target/linux/bcm4908/patches-5.4/170-net-broadcom-bcm4908_enet-set-MTU-on-open-on-request.patch')
diff --git a/target/linux/bcm4908/patches-5.4/170-net-broadcom-bcm4908_enet-set-MTU-on-open-on-request.patch b/target/linux/bcm4908/patches-5.4/170-net-broadcom-bcm4908_enet-set-MTU-on-open-on-request.patch
deleted file mode 100644
index 87cb851034..0000000000
--- a/target/linux/bcm4908/patches-5.4/170-net-broadcom-bcm4908_enet-set-MTU-on-open-on-request.patch
+++ /dev/null
@@ -1,113 +0,0 @@
-From d7dfbcba0437955ccbe4c6db736526d528f27720 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
-Subject: [PATCH] net: broadcom: bcm4908_enet: set MTU on open & on request
-
-Hardware comes up with default max frame size set to 1518. When using it
-with switch it results in actual Ethernet MTU 1492:
-1518 - 14 (Ethernet header) - 4 (Broadcom's tag) - 4 (802.1q) - 4 (FCS)
-
-Above means hardware in its default state can't handle standard Ethernet
-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.
----
- drivers/net/ethernet/broadcom/bcm4908_enet.c | 31 ++++++++++++++++----
- 1 file changed, 25 insertions(+), 6 deletions(-)
-
---- a/drivers/net/ethernet/broadcom/bcm4908_enet.c
-+++ b/drivers/net/ethernet/broadcom/bcm4908_enet.c
-@@ -5,6 +5,7 @@
-
- #include <linux/delay.h>
- #include <linux/etherdevice.h>
-+#include <linux/if_vlan.h>
- #include <linux/interrupt.h>
- #include <linux/module.h>
- #include <linux/of.h>
-@@ -29,9 +30,10 @@
- ENET_DMA_CH_CFG_INT_BUFF_DONE)
- #define ENET_DMA_MAX_BURST_LEN 8 /* in 64 bit words */
-
--#define ENET_MTU_MIN 60
--#define ENET_MTU_MAX 1500 /* Is it possible to support 2044? */
--#define ENET_MTU_MAX_EXTRA_SIZE 32 /* L2 */
-+#define ENET_MTU_MAX ETH_DATA_LEN /* Is it possible to support 2044? */
-+#define BRCM_MAX_TAG_LEN 6
-+#define ENET_MAX_ETH_OVERHEAD (ETH_HLEN + BRCM_MAX_TAG_LEN + VLAN_HLEN + \
-+ ETH_FCS_LEN + 4) /* 32 */
-
- struct bcm4908_enet_dma_ring_bd {
- __le32 ctl;
-@@ -135,6 +137,11 @@ static void bcm4908_enet_intrs_ack(struc
- enet_write(enet, ENET_DMA_CH_RX_CFG + ENET_DMA_CH_CFG_INT_STAT, ENET_DMA_INT_DEFAULTS);
- }
-
-+static void bcm4908_enet_set_mtu(struct bcm4908_enet *enet, int mtu)
-+{
-+ enet_umac_write(enet, UMAC_MAX_FRAME_LEN, mtu + ENET_MAX_ETH_OVERHEAD);
-+}
-+
- /***
- * DMA
- */
-@@ -246,7 +253,7 @@ static int bcm4908_enet_dma_alloc_rx_buf
- u32 tmp;
- int err;
-
-- slot->len = ENET_MTU_MAX + ENET_MTU_MAX_EXTRA_SIZE;
-+ slot->len = ENET_MTU_MAX + ENET_MAX_ETH_OVERHEAD;
-
- slot->skb = netdev_alloc_skb(enet->netdev, slot->len);
- if (!slot->skb)
-@@ -374,6 +381,8 @@ static void bcm4908_enet_gmac_init(struc
- {
- u32 cmd;
-
-+ bcm4908_enet_set_mtu(enet, enet->netdev->mtu);
-+
- cmd = enet_umac_read(enet, UMAC_CMD);
- enet_umac_write(enet, UMAC_CMD, cmd | CMD_SW_RESET);
- enet_umac_write(enet, UMAC_CMD, cmd & ~CMD_SW_RESET);
-@@ -559,7 +568,7 @@ static int bcm4908_enet_poll(struct napi
-
- len = (ctl & DMA_CTL_LEN_DESC_BUFLENGTH) >> DMA_CTL_LEN_DESC_BUFLENGTH_SHIFT;
-
-- if (len < ENET_MTU_MIN ||
-+ if (len < ETH_ZLEN ||
- (ctl & (DMA_CTL_STATUS_SOP | DMA_CTL_STATUS_EOP)) != (DMA_CTL_STATUS_SOP | DMA_CTL_STATUS_EOP)) {
- enet->netdev->stats.rx_dropped++;
- break;
-@@ -583,11 +592,21 @@ static int bcm4908_enet_poll(struct napi
- return handled;
- }
-
-+static int bcm4908_enet_change_mtu(struct net_device *netdev, int new_mtu)
-+{
-+ struct bcm4908_enet *enet = netdev_priv(netdev);
-+
-+ bcm4908_enet_set_mtu(enet, new_mtu);
-+
-+ return 0;
-+}
-+
- static const struct net_device_ops bcm4908_enet_netdev_ops = {
- .ndo_open = bcm4908_enet_open,
- .ndo_stop = bcm4908_enet_stop,
- .ndo_start_xmit = bcm4908_enet_start_xmit,
- .ndo_set_mac_address = eth_mac_addr,
-+ .ndo_change_mtu = bcm4908_enet_change_mtu,
- };
-
- static int bcm4908_enet_probe(struct platform_device *pdev)
-@@ -625,7 +644,7 @@ static int bcm4908_enet_probe(struct pla
- eth_hw_addr_random(netdev);
- netdev->netdev_ops = &bcm4908_enet_netdev_ops;
- netdev->min_mtu = ETH_ZLEN;
-- netdev->mtu = ENET_MTU_MAX;
-+ netdev->mtu = ETH_DATA_LEN;
- netdev->max_mtu = ENET_MTU_MAX;
- netif_napi_add(netdev, &enet->napi, bcm4908_enet_poll, 64);
-
--
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