Messages in this thread | | | Date | Mon, 3 Jul 2023 08:45:38 -0600 | Subject | Re: Memory providers multiplexing (Was: [PATCH net-next v4 4/5] page_pool: remove PP_FLAG_PAGE_FRAG flag) | From | David Ahern <> |
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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.
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