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e3a1e78cd8
It compiles but *doesn't* boot so it isn't enabled yet. Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
120 lines
3.9 KiB
Diff
120 lines
3.9 KiB
Diff
From 14b3b46a67f78ade99eafcbf320105615e948569 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
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Date: Fri, 12 Feb 2021 16:21:35 +0100
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Subject: [PATCH] net: broadcom: bcm4908_enet: set MTU on open & on request
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Hardware comes up with default max frame size set to 1518. When using it
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with switch it results in actual Ethernet MTU 1492:
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1518 - 14 (Ethernet header) - 4 (Broadcom's tag) - 4 (802.1q) - 4 (FCS)
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Above means hardware in its default state can't handle standard Ethernet
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traffic (MTU 1500).
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Define maximum possible Ethernet overhead and always set MAC max frame
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length accordingly. This change fixes handling Ethernet frames of length
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1506 - 1514.
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Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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drivers/net/ethernet/broadcom/bcm4908_enet.c | 31 ++++++++++++++++----
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1 file changed, 25 insertions(+), 6 deletions(-)
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--- a/drivers/net/ethernet/broadcom/bcm4908_enet.c
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+++ b/drivers/net/ethernet/broadcom/bcm4908_enet.c
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@@ -5,6 +5,7 @@
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#include <linux/delay.h>
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#include <linux/etherdevice.h>
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+#include <linux/if_vlan.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/of.h>
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@@ -29,9 +30,10 @@
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ENET_DMA_CH_CFG_INT_BUFF_DONE)
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#define ENET_DMA_MAX_BURST_LEN 8 /* in 64 bit words */
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-#define ENET_MTU_MIN 60
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-#define ENET_MTU_MAX 1500 /* Is it possible to support 2044? */
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-#define ENET_MTU_MAX_EXTRA_SIZE 32 /* L2 */
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+#define ENET_MTU_MAX ETH_DATA_LEN /* Is it possible to support 2044? */
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+#define BRCM_MAX_TAG_LEN 6
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+#define ENET_MAX_ETH_OVERHEAD (ETH_HLEN + BRCM_MAX_TAG_LEN + VLAN_HLEN + \
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+ ETH_FCS_LEN + 4) /* 32 */
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struct bcm4908_enet_dma_ring_bd {
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__le32 ctl;
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@@ -135,6 +137,11 @@ static void bcm4908_enet_intrs_ack(struc
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enet_write(enet, ENET_DMA_CH_RX_CFG + ENET_DMA_CH_CFG_INT_STAT, ENET_DMA_INT_DEFAULTS);
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}
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+static void bcm4908_enet_set_mtu(struct bcm4908_enet *enet, int mtu)
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+{
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+ enet_umac_write(enet, UMAC_MAX_FRAME_LEN, mtu + ENET_MAX_ETH_OVERHEAD);
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+}
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+
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/***
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* DMA
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*/
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@@ -246,7 +253,7 @@ static int bcm4908_enet_dma_alloc_rx_buf
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u32 tmp;
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int err;
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- slot->len = ENET_MTU_MAX + ENET_MTU_MAX_EXTRA_SIZE;
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+ slot->len = ENET_MTU_MAX + ENET_MAX_ETH_OVERHEAD;
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slot->skb = netdev_alloc_skb(enet->netdev, slot->len);
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if (!slot->skb)
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@@ -374,6 +381,8 @@ static void bcm4908_enet_gmac_init(struc
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{
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u32 cmd;
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+ bcm4908_enet_set_mtu(enet, enet->netdev->mtu);
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+
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cmd = enet_umac_read(enet, UMAC_CMD);
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enet_umac_write(enet, UMAC_CMD, cmd | CMD_SW_RESET);
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enet_umac_write(enet, UMAC_CMD, cmd & ~CMD_SW_RESET);
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@@ -559,7 +568,7 @@ static int bcm4908_enet_poll(struct napi
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len = (ctl & DMA_CTL_LEN_DESC_BUFLENGTH) >> DMA_CTL_LEN_DESC_BUFLENGTH_SHIFT;
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- if (len < ENET_MTU_MIN ||
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+ if (len < ETH_ZLEN ||
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(ctl & (DMA_CTL_STATUS_SOP | DMA_CTL_STATUS_EOP)) != (DMA_CTL_STATUS_SOP | DMA_CTL_STATUS_EOP)) {
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enet->netdev->stats.rx_dropped++;
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break;
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@@ -583,11 +592,21 @@ static int bcm4908_enet_poll(struct napi
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return handled;
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}
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+static int bcm4908_enet_change_mtu(struct net_device *netdev, int new_mtu)
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+{
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+ struct bcm4908_enet *enet = netdev_priv(netdev);
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+
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+ bcm4908_enet_set_mtu(enet, new_mtu);
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+
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+ return 0;
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+}
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+
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static const struct net_device_ops bcm4908_enet_netdev_ops = {
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.ndo_open = bcm4908_enet_open,
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.ndo_stop = bcm4908_enet_stop,
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.ndo_start_xmit = bcm4908_enet_start_xmit,
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.ndo_set_mac_address = eth_mac_addr,
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+ .ndo_change_mtu = bcm4908_enet_change_mtu,
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};
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static int bcm4908_enet_probe(struct platform_device *pdev)
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@@ -625,7 +644,7 @@ static int bcm4908_enet_probe(struct pla
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eth_hw_addr_random(netdev);
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netdev->netdev_ops = &bcm4908_enet_netdev_ops;
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netdev->min_mtu = ETH_ZLEN;
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- netdev->mtu = ENET_MTU_MAX;
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+ netdev->mtu = ETH_DATA_LEN;
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netdev->max_mtu = ENET_MTU_MAX;
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netif_napi_add(netdev, &enet->napi, bcm4908_enet_poll, 64);
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