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bcm4908: fix Ethernet broken state after interface restart

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This fixes traffic stalls after ifdown & ifup.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
This commit is contained in:
Rafał Miłecki 2021-06-22 07:47:18 +02:00
parent 85ce590705
commit f8d5bd20b3
1 changed files with 43 additions and 0 deletions
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43
target/linux/bcm4908/patches-5.4/170-net-broadcom-bcm4908_enet-reset-DMA-rings-sw-indexes.patch Normal file
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@ -0,0 +1,43 @@
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
Date: Tue, 22 Jun 2021 07:05:04 +0200
Subject: [PATCH] net: broadcom: bcm4908_enet: reset DMA rings sw indexes
properly
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Resetting software indexes in bcm4908_dma_alloc_buf_descs() is not
enough as it's called during device probe only. Driver resets DMA on
every .ndo_open callback and it's required to reset indexes then.
This fixes inconsistent rings state and stalled traffic after interface
down & up sequence.
Fixes: 4feffeadbcb2 ("net: broadcom: bcm4908enet: add BCM4908 controller driver")
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
---
drivers/net/ethernet/broadcom/bcm4908_enet.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/net/ethernet/broadcom/bcm4908_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm4908_enet.c
@@ -174,9 +174,6 @@ static int bcm4908_dma_alloc_buf_descs(s
if (!ring->slots)
goto err_free_buf_descs;
- ring->read_idx = 0;
- ring->write_idx = 0;
-
return 0;
err_free_buf_descs:
@@ -303,6 +300,9 @@ static void bcm4908_enet_dma_ring_init(s
enet_write(enet, ring->st_ram_block + ENET_DMA_CH_STATE_RAM_BASE_DESC_PTR,
(uint32_t)ring->dma_addr);
+
+ ring->read_idx = 0;
+ ring->write_idx = 0;
}
static void bcm4908_enet_dma_uninit(struct bcm4908_enet *enet)