Re: Memory providers multiplexing (Was: [PATCH net-next v4 4/5] page_pool: remove PP_FLAG_PAGE_FRAG flag)
From: David Ahern <dsahern@kernel.org>
Date: 2023-07-03 14:46:39
Also in:
linux-mediatek, linux-rdma, linux-wireless, lkml, netdev
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