From: David Ahern <dsahern@kernel.org>
To: Mina Almasry <almasrymina@google.com>
Cc: Jakub Kicinski <kuba@kernel.org>,
Jesper Dangaard Brouer <jbrouer@redhat.com>,
brouer@redhat.com, Alexander Duyck <alexander.duyck@gmail.com>,
Yunsheng Lin <linyunsheng@huawei.com>,
davem@davemloft.net, pabeni@redhat.com, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org,
Lorenzo Bianconi <lorenzo@kernel.org>,
Yisen Zhuang <yisen.zhuang@huawei.com>,
Salil Mehta <salil.mehta@huawei.com>,
Eric Dumazet <edumazet@google.com>,
Sunil Goutham <sgoutham@marvell.com>,
Geetha sowjanya <gakula@marvell.com>,
Subbaraya Sundeep <sbhatta@marvell.com>,
hariprasad <hkelam@marvell.com>,
Saeed Mahameed <saeedm@nvidia.com>,
Leon Romanovsky <leon@kernel.org>, Felix Fietkau <nbd@nbd.name>,
Ryder Lee <ryder.lee@mediatek.com>,
Shayne Chen <shayne.chen@mediatek.com>,
Sean Wang <sean.wang@mediatek.com>, Kalle Valo <kvalo@kernel.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@collabora.com>,
Jesper Dangaard Brouer <hawk@kernel.org>,
Ilias Apalodimas <ilias.apalodimas@linaro.org>,
linux-rdma@vger.kernel.org, linux-wireless@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-mediatek@lists.infradead.org,
Jonathan Lemon <jonathan.lemon@gmail.com>
Subject: Re: Memory providers multiplexing (Was: [PATCH net-next v4 4/5] page_pool: remove PP_FLAG_PAGE_FRAG flag)
Date: Mon, 3 Jul 2023 08:45:38 -0600 [thread overview]
Message-ID: <47b79e77-461b-8fe9-41fb-b69a6b205ef2@kernel.org> (raw)
In-Reply-To: <CAHS8izP2fPS56uXKMCnbKnPNn=xhTd0SZ1NRUgnAvyuSeSSjGA@mail.gmail.com>
On 7/3/23 12:22 AM, Mina Almasry wrote:
> tcpdump is able to access the header of these skbs which is in host
> memory, but not the payload in device memory. Here is an example
> session with my netcat-like test for device memory TCP:
> https://pastebin.com/raw/FRjKf0kv
>
> tcpdump seems to work, and the length of the packets above is correct.
> tcpdump -A however isn't able to print the payload of the packets:
> https://pastebin.com/raw/2PcNxaZV
That is my expectation. The tcpdump is just an easy example of accessing
the skb page frags. skb_copy_and_csum_bits used by icmp is another
example that can walk frags wanting access to device memory. You did not
cause a panic or trip a WARN_ON for example with the tcpdump?
Thanks for checking.
WARNING: multiple messages have this Message-ID (diff)
From: David Ahern <dsahern@kernel.org>
To: Mina Almasry <almasrymina@google.com>
Cc: Jakub Kicinski <kuba@kernel.org>,
Jesper Dangaard Brouer <jbrouer@redhat.com>,
brouer@redhat.com, Alexander Duyck <alexander.duyck@gmail.com>,
Yunsheng Lin <linyunsheng@huawei.com>,
davem@davemloft.net, pabeni@redhat.com, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org,
Lorenzo Bianconi <lorenzo@kernel.org>,
Yisen Zhuang <yisen.zhuang@huawei.com>,
Salil Mehta <salil.mehta@huawei.com>,
Eric Dumazet <edumazet@google.com>,
Sunil Goutham <sgoutham@marvell.com>,
Geetha sowjanya <gakula@marvell.com>,
Subbaraya Sundeep <sbhatta@marvell.com>,
hariprasad <hkelam@marvell.com>,
Saeed Mahameed <saeedm@nvidia.com>,
Leon Romanovsky <leon@kernel.org>, Felix Fietkau <nbd@nbd.name>,
Ryder Lee <ryder.lee@mediatek.com>,
Shayne Chen <shayne.chen@mediatek.com>,
Sean Wang <sean.wang@mediatek.com>, Kalle Valo <kvalo@kernel.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@collabora.com>,
Jesper Dangaard Brouer <hawk@kernel.org>,
Ilias Apalodimas <ilias.apalodimas@linaro.org>,
linux-rdma@vger.kernel.org, linux-wireless@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-mediatek@lists.infradead.org,
Jonathan Lemon <jonathan.lemon@gmail.com>
Subject: Re: Memory providers multiplexing (Was: [PATCH net-next v4 4/5] page_pool: remove PP_FLAG_PAGE_FRAG flag)
Date: Mon, 3 Jul 2023 08:45:38 -0600 [thread overview]
Message-ID: <47b79e77-461b-8fe9-41fb-b69a6b205ef2@kernel.org> (raw)
In-Reply-To: <CAHS8izP2fPS56uXKMCnbKnPNn=xhTd0SZ1NRUgnAvyuSeSSjGA@mail.gmail.com>
On 7/3/23 12:22 AM, Mina Almasry wrote:
> tcpdump is able to access the header of these skbs which is in host
> memory, but not the payload in device memory. Here is an example
> session with my netcat-like test for device memory TCP:
> https://pastebin.com/raw/FRjKf0kv
>
> tcpdump seems to work, and the length of the packets above is correct.
> tcpdump -A however isn't able to print the payload of the packets:
> https://pastebin.com/raw/2PcNxaZV
That is my expectation. The tcpdump is just an easy example of accessing
the skb page frags. skb_copy_and_csum_bits used by icmp is another
example that can walk frags wanting access to device memory. You did not
cause a panic or trip a WARN_ON for example with the tcpdump?
Thanks for checking.
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2023-07-03 14:45 UTC|newest]
Thread overview: 155+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-12 13:02 [PATCH net-next v4 0/5] introduce page_pool_alloc() API Yunsheng Lin
2023-06-12 13:02 ` [PATCH net-next v4 1/5] page_pool: frag API support for 32-bit arch with 64-bit DMA Yunsheng Lin
2023-06-13 13:30 ` Alexander Lobakin
2023-06-14 3:36 ` Yunsheng Lin
2023-06-14 3:55 ` Jakub Kicinski
2023-06-14 10:52 ` Alexander Lobakin
2023-06-14 12:15 ` Yunsheng Lin
2023-06-14 12:42 ` Alexander Lobakin
2023-06-14 4:09 ` Jakub Kicinski
2023-06-14 11:42 ` Yunsheng Lin
2023-06-14 17:07 ` Jakub Kicinski
2023-06-15 7:29 ` Yunsheng Lin
2023-06-12 13:02 ` [PATCH net-next v4 2/5] page_pool: unify frag_count handling in page_pool_is_last_frag() Yunsheng Lin
2023-06-14 4:33 ` Jakub Kicinski
2023-06-14 11:55 ` Yunsheng Lin
2023-06-12 13:02 ` [PATCH net-next v4 3/5] page_pool: introduce page_pool_alloc() API Yunsheng Lin
2023-06-13 13:08 ` Alexander Lobakin
2023-06-13 13:11 ` Alexander Lobakin
2023-06-14 3:17 ` Yunsheng Lin
2023-06-12 13:02 ` [PATCH net-next v4 4/5] page_pool: remove PP_FLAG_PAGE_FRAG flag Yunsheng Lin
2023-06-14 17:19 ` Jakub Kicinski
2023-06-14 17:19 ` Jakub Kicinski
2023-06-15 7:17 ` Yunsheng Lin
2023-06-15 7:17 ` Yunsheng Lin
2023-06-15 16:51 ` Jakub Kicinski
2023-06-15 16:51 ` Jakub Kicinski
2023-06-15 18:26 ` Alexander Duyck
2023-06-15 18:26 ` Alexander Duyck
2023-06-16 12:20 ` Yunsheng Lin
2023-06-16 12:20 ` Yunsheng Lin
2023-06-16 15:01 ` Alexander Duyck
2023-06-16 15:01 ` Alexander Duyck
2023-06-16 18:59 ` Jesper Dangaard Brouer
2023-06-16 18:59 ` Jesper Dangaard Brouer
2023-06-16 19:21 ` Jakub Kicinski
2023-06-16 19:21 ` Jakub Kicinski
2023-06-16 20:42 ` Memory providers multiplexing (Was: [PATCH net-next v4 4/5] page_pool: remove PP_FLAG_PAGE_FRAG flag) Jesper Dangaard Brouer
2023-06-16 20:42 ` Jesper Dangaard Brouer
2023-06-19 18:07 ` Jakub Kicinski
2023-06-19 18:07 ` Jakub Kicinski
2023-06-20 15:12 ` Jesper Dangaard Brouer
2023-06-20 15:12 ` Jesper Dangaard Brouer
2023-06-20 15:39 ` Jakub Kicinski
2023-06-20 15:39 ` Jakub Kicinski
2023-06-30 2:27 ` Mina Almasry
2023-06-30 2:27 ` Mina Almasry
2023-07-03 4:20 ` David Ahern
2023-07-03 4:20 ` David Ahern
2023-07-03 6:22 ` Mina Almasry
2023-07-03 6:22 ` Mina Almasry
2023-07-03 14:45 ` David Ahern [this message]
2023-07-03 14:45 ` David Ahern
2023-07-03 17:13 ` Eric Dumazet
2023-07-03 17:13 ` Eric Dumazet
2023-07-03 17:23 ` David Ahern
2023-07-03 17:23 ` David Ahern
2023-07-06 1:19 ` Mina Almasry
2023-07-06 1:19 ` Mina Almasry
2023-07-03 17:15 ` Eric Dumazet
2023-07-03 17:15 ` Eric Dumazet
2023-07-03 17:25 ` David Ahern
2023-07-03 17:25 ` David Ahern
2023-07-03 21:43 ` Jason Gunthorpe
2023-07-03 21:43 ` Jason Gunthorpe
2023-07-06 1:17 ` Mina Almasry
2023-07-06 1:17 ` Mina Almasry
2023-07-10 17:44 ` Jason Gunthorpe
2023-07-10 17:44 ` Jason Gunthorpe
2023-07-10 23:02 ` Mina Almasry
2023-07-10 23:02 ` Mina Almasry
2023-07-10 23:49 ` Jason Gunthorpe
2023-07-10 23:49 ` Jason Gunthorpe
2023-07-11 0:45 ` Mina Almasry
2023-07-11 0:45 ` Mina Almasry
2023-07-11 13:11 ` Jason Gunthorpe
2023-07-11 13:11 ` Jason Gunthorpe
2023-07-11 17:24 ` Mina Almasry
2023-07-11 17:24 ` Mina Almasry
2023-07-11 4:27 ` Christoph Hellwig
2023-07-11 4:27 ` Christoph Hellwig
2023-07-11 4:59 ` Jakub Kicinski
2023-07-11 4:59 ` Jakub Kicinski
2023-07-11 5:04 ` Christoph Hellwig
2023-07-11 5:04 ` Christoph Hellwig
2023-07-11 12:05 ` Jason Gunthorpe
2023-07-11 12:05 ` Jason Gunthorpe
2023-07-11 16:00 ` Jakub Kicinski
2023-07-11 16:00 ` Jakub Kicinski
2023-07-11 16:20 ` David Ahern
2023-07-11 16:20 ` David Ahern
2023-07-11 16:32 ` Jakub Kicinski
2023-07-11 16:32 ` Jakub Kicinski
2023-07-11 17:06 ` Mina Almasry
2023-07-11 17:06 ` Mina Almasry
2023-07-11 20:39 ` Jakub Kicinski
2023-07-11 20:39 ` Jakub Kicinski
2023-07-11 21:39 ` David Ahern
2023-07-11 21:39 ` David Ahern
2023-07-12 3:42 ` Mina Almasry
2023-07-12 3:42 ` Mina Almasry
2023-07-12 7:55 ` Christian König
2023-07-12 7:55 ` Christian König
2023-07-12 13:03 ` Jason Gunthorpe
2023-07-12 13:03 ` Jason Gunthorpe
2023-07-12 13:35 ` Christian König
2023-07-12 13:35 ` Christian König
2023-07-12 22:41 ` Mina Almasry
2023-07-12 22:41 ` Mina Almasry
2023-07-12 13:01 ` Jason Gunthorpe
2023-07-12 13:01 ` Jason Gunthorpe
2023-07-12 20:16 ` Mina Almasry
2023-07-12 20:16 ` Mina Almasry
2023-07-12 23:57 ` Jason Gunthorpe
2023-07-12 23:57 ` Jason Gunthorpe
2023-07-13 7:56 ` Christian König
2023-07-13 7:56 ` Christian König
2023-07-14 14:55 ` Mina Almasry
2023-07-14 14:55 ` Mina Almasry
2023-07-14 15:18 ` David Ahern
2023-07-14 15:18 ` David Ahern
2023-07-17 2:05 ` Mina Almasry
2023-07-17 2:05 ` Mina Almasry
2023-07-17 3:08 ` David Ahern
2023-07-17 3:08 ` David Ahern
2023-07-14 15:55 ` Jason Gunthorpe
2023-07-14 15:55 ` Jason Gunthorpe
2023-07-17 1:53 ` Mina Almasry
2023-07-17 1:53 ` Mina Almasry
2023-07-24 14:56 ` Jesper Dangaard Brouer
2023-07-24 16:28 ` Jason Gunthorpe
2023-07-25 4:04 ` Mina Almasry
2023-07-26 17:36 ` Jesper Dangaard Brouer
2023-07-11 16:42 ` Jason Gunthorpe
2023-07-11 16:42 ` Jason Gunthorpe
2023-07-11 17:06 ` Jakub Kicinski
2023-07-11 17:06 ` Jakub Kicinski
2023-07-11 18:52 ` Jason Gunthorpe
2023-07-11 18:52 ` Jason Gunthorpe
2023-07-11 20:34 ` Jakub Kicinski
2023-07-11 20:34 ` Jakub Kicinski
2023-07-11 23:56 ` Jason Gunthorpe
2023-07-11 23:56 ` Jason Gunthorpe
2023-07-11 6:52 ` Dan Williams
2023-07-11 6:52 ` Dan Williams
2023-07-06 16:50 ` Jakub Kicinski
2023-07-06 16:50 ` Jakub Kicinski
2023-06-17 12:19 ` [PATCH net-next v4 4/5] page_pool: remove PP_FLAG_PAGE_FRAG flag Yunsheng Lin
2023-06-17 12:19 ` Yunsheng Lin
2023-06-15 13:59 ` Alexander Lobakin
2023-06-15 13:59 ` Alexander Lobakin
2023-06-12 13:02 ` [PATCH net-next v4 5/5] page_pool: update document about frag API Yunsheng Lin
2023-06-14 4:40 ` Jakub Kicinski
2023-06-14 12:04 ` Yunsheng Lin
2023-06-14 16:56 ` Jakub Kicinski
2023-06-15 6:49 ` Yunsheng Lin
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