Re: [PATCH v5 bpf-next 03/14] xdp: add xdp_shared_info data structure
From: Jesper Dangaard Brouer <hidden>
Date: 2020-12-21 10:04:45
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bpf
On Sat, 19 Dec 2020 10:30:57 -0500 Jamal Hadi Salim [off-list ref] wrote:
On 2020-12-19 9:53 a.m., Shay Agroskin wrote:quoted
Lorenzo Bianconi [off-list ref] writes:quoted
quoted
for the moment I do not know if this area is used for other purposes. Do you think there are other use-cases for it?
Yes, all the same use-cases as SKB have. I wanted to keep this the same as skb_shared_info, but Lorenzo choose to take John's advice and it going in this direction (which is fine, we can always change and adjust this later).
Sorry to interject: Does it make sense to use it to store arbitrary metadata or a scratchpad in this space? Something equivalent to skb->cb which is lacking in XDP.
Well, XDP have the data_meta area. But difficult to rely on because a lot of driver don't implement it. And Saeed and I plan to use this area and populate it with driver info from RX-descriptor. -- Best regards, Jesper Dangaard Brouer MSc.CS, Principal Kernel Engineer at Red Hat LinkedIn: http://www.linkedin.com/in/brouer