mirror of
https://github.com/Ysurac/openmptcprouter.git
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70 lines
2.4 KiB
Diff
70 lines
2.4 KiB
Diff
From ec6d6e1b7ffdc2938edb2849e47b9436cff5c403 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.com>
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Date: Fri, 25 Sep 2020 15:07:23 +0100
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Subject: [PATCH] net: bcmgenet: Reset RBUF on first open
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If the RBUF logic is not reset when the kernel starts then there
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may be some data left over from any network boot loader. If the
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64-byte packet headers are enabled then this can be fatal.
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Extend bcmgenet_dma_disable to do perform the reset, but not when
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called from bcmgenet_resume in order to preserve a wake packet.
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N.B. This different handling of resume is just based on a hunch -
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why else wouldn't one reset the RBUF as well as the TBUF? If this
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isn't the case then it's easy to change the patch to make the RBUF
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reset unconditional.
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See: https://github.com/raspberrypi/linux/issues/3850
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Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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---
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drivers/net/ethernet/broadcom/genet/bcmgenet.c | 16 ++++++++++++----
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1 file changed, 12 insertions(+), 4 deletions(-)
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--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
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+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
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@@ -3304,7 +3304,7 @@ static void bcmgenet_get_hw_addr(struct
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}
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/* Returns a reusable dma control register value */
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-static u32 bcmgenet_dma_disable(struct bcmgenet_priv *priv)
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+static u32 bcmgenet_dma_disable(struct bcmgenet_priv *priv, bool flush_rx)
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{
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unsigned int i;
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u32 reg;
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@@ -3329,6 +3329,14 @@ static u32 bcmgenet_dma_disable(struct b
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udelay(10);
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bcmgenet_umac_writel(priv, 0, UMAC_TX_FLUSH);
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+ if (flush_rx) {
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+ reg = bcmgenet_rbuf_ctrl_get(priv);
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+ bcmgenet_rbuf_ctrl_set(priv, reg | BIT(0));
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+ udelay(10);
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+ bcmgenet_rbuf_ctrl_set(priv, reg);
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+ udelay(10);
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+ }
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+
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return dma_ctrl;
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}
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@@ -3392,8 +3400,8 @@ static int bcmgenet_open(struct net_devi
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bcmgenet_set_hw_addr(priv, dev->dev_addr);
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- /* Disable RX/TX DMA and flush TX queues */
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- dma_ctrl = bcmgenet_dma_disable(priv);
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+ /* Disable RX/TX DMA and flush TX and RX queues */
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+ dma_ctrl = bcmgenet_dma_disable(priv, true);
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/* Reinitialize TDMA and RDMA and SW housekeeping */
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ret = bcmgenet_init_dma(priv);
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@@ -4267,7 +4275,7 @@ static int bcmgenet_resume(struct device
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bcmgenet_hfb_create_rxnfc_filter(priv, rule);
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/* Disable RX/TX DMA and flush TX queues */
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- dma_ctrl = bcmgenet_dma_disable(priv);
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+ dma_ctrl = bcmgenet_dma_disable(priv, false);
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/* Reinitialize TDMA and RDMA and SW housekeeping */
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ret = bcmgenet_init_dma(priv);
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