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kernel: generic: tg3: Fix DMA allocations on 57766 devices

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At the request of rsalvaterra, add this patch to fix an issue
affecting tg3 ethernet interfaces[1].

1. https://github.com/openwrt/openwrt/pull/17271#issuecomment-2543836518

Tested-by: Rui Salvaterra <rsalvaterra@gmail.com>
Signed-off-by: John Audia <therealgraysky@proton.me>
Link: https://github.com/openwrt/openwrt/pull/17282
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
This commit is contained in:
John Audia 2024-12-15 09:30:52 -05:00 committed by Hauke Mehrtens
parent 96eb12e961
commit a3c484c3b9
1 changed files with 31 additions and 0 deletions
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31
target/linux/generic/pending-6.6/791-tg3-Fix-DMA-allocations-on-57766-devices.patch Normal file
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@ -0,0 +1,31 @@
From f992b15965177e2f280fb6f41f292214f9a6f8d5 Mon Sep 17 00:00:00 2001
From: Pavan Chebbi <pavan.chebbi@broadcom.com>
Date: Tue, 10 Dec 2024 03:28:31 -0800
Subject: [PATCH] tg3: Fix DMA allocations on 57766 devices
The coherent DMA mask of 31b may not be accepted if
the DMA mask is configured to use higher memories of
64b. Set the DMA mask also to lower 32b for 57766
devices.
Fixes: 614f4d166eee ("tg3: Set coherent DMA mask bits to 31 for BCM57766 chipsets")
Reported-By: Rui Salvaterra <rsalvaterra@gmail.com>
Signed-off-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
---
drivers/net/ethernet/broadcom/tg3.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -17731,8 +17731,10 @@ static int tg3_init_one(struct pci_dev *
} else
persist_dma_mask = dma_mask = DMA_BIT_MASK(64);
- if (tg3_asic_rev(tp) == ASIC_REV_57766)
+ if (tg3_asic_rev(tp) == ASIC_REV_57766) {
+ dma_mask = DMA_BIT_MASK(32);
persist_dma_mask = DMA_BIT_MASK(31);
+ }
/* Configure DMA attributes. */
if (dma_mask > DMA_BIT_MASK(32)) {