netdev - Re: [PATCH v5 0/4] UIO_MEM_DMA_COHERENT for cnic/bnx2/bnx2x

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Message-ID: <5228a235-69f4-4a9b-8142-96d9b4a5a1c8@intel.com>
Date: Mon, 5 Feb 2024 17:57:58 +0100
From: Alexander Lobakin <aleksander.lobakin@...el.com>
To: Chris Leech <cleech@...hat.com>
CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Nilesh Javali
	<njavali@...vell.com>, Christoph Hellwig <hch@....de>, John Meneghini
	<jmeneghi@...hat.com>, Lee Duncan <lduncan@...e.com>, Mike Christie
	<michael.christie@...cle.com>, Hannes Reinecke <hare@...nel.org>,
	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-scsi@...r.kernel.org>, <GR-QLogic-Storage-Upstream@...vell.com>
Subject: Re: [PATCH v5 0/4] UIO_MEM_DMA_COHERENT for cnic/bnx2/bnx2x

From: Chris Leech <cleech@...hat.com>
Date: Thu,  1 Feb 2024 15:33:56 -0800

> During bnx2i iSCSI testing we ran into page refcounting issues in the
> uio mmaps exported from cnic to the iscsiuio process, and bisected back
> to the removal of the __GFP_COMP flag from dma_alloc_coherent calls.

IIRC Jakub mentioned some time ago that he doesn't want to see
third-party userspace <-> kernel space communication in the networking
drivers, to me this looks exactly like that :z

Thanks,
Olek