Please try this upstream patch.
commit 9bc297ea0622bb2a6b3abfa2fa84f0a3b86ef8c8
Author: Nithin Sujir <nsu...@broadcom.com>
Date: Mon Jun 3 09:19:34 2013 +0000
tg3: Add read dma workaround for 5720
Commit 091f0ea30074bc43f9250961b3247af713024bc6 "tg3: Add New 5719 Read
DMA workaround" added a workaround for TX DMA stall on the 5719. This
workaround needs to be applied to the 5720 as well.
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Title:
BCM95720 Network disconnects and resets with new Dell R520 server
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