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1247a6bb35
This fixes traffic stalls after ifdown & ifup.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
(cherry picked from commit f8d5bd20b3)
44 lines
1.4 KiB
Diff
44 lines
1.4 KiB
Diff
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
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Date: Tue, 22 Jun 2021 07:05:04 +0200
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Subject: [PATCH] net: broadcom: bcm4908_enet: reset DMA rings sw indexes
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properly
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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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Resetting software indexes in bcm4908_dma_alloc_buf_descs() is not
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enough as it's called during device probe only. Driver resets DMA on
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every .ndo_open callback and it's required to reset indexes then.
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This fixes inconsistent rings state and stalled traffic after interface
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down & up sequence.
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Fixes: 4feffeadbcb2 ("net: broadcom: bcm4908enet: add BCM4908 controller driver")
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Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
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---
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drivers/net/ethernet/broadcom/bcm4908_enet.c | 6 +++---
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1 file changed, 3 insertions(+), 3 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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@@ -174,9 +174,6 @@ static int bcm4908_dma_alloc_buf_descs(s
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if (!ring->slots)
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goto err_free_buf_descs;
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- ring->read_idx = 0;
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- ring->write_idx = 0;
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-
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return 0;
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err_free_buf_descs:
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@@ -303,6 +300,9 @@ static void bcm4908_enet_dma_ring_init(s
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enet_write(enet, ring->st_ram_block + ENET_DMA_CH_STATE_RAM_BASE_DESC_PTR,
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(uint32_t)ring->dma_addr);
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+
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+ ring->read_idx = 0;
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+ ring->write_idx = 0;
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}
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static void bcm4908_enet_dma_uninit(struct bcm4908_enet *enet)
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