Toshiaki Makita <makita.toshiaki@xxxxxxxxxxxxx> writes: > XDP_TX is similar to XDP_REDIRECT as it essentially redirects packets to > the device itself. XDP_REDIRECT has bulk transmit mechanism to avoid the > heavy cost of indirect call but it also reduces lock acquisition on the > destination device that needs locks like veth and tun. > > XDP_TX does not use indirect calls but drivers which require locks can > benefit from the bulk transmit for XDP_TX as well. XDP_TX happens on the same device, so there's an implicit bulking happening because of the NAPI cycle. So why is an additional mechanism needed (in the general case)? -Toke
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