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Subject: Re: [virtio-dev] Re: [PATCH v9] virtio-net: support inner header hash
On Thu, Mar 02, 2023 at 04:59:46PM +0800, Jason Wang wrote: > On Thu, Mar 2, 2023 at 4:41âPM Michael S. Tsirkin <mst@redhat.com> wrote: > > > > On Thu, Mar 02, 2023 at 04:15:39PM +0800, Jason Wang wrote: > > > On Thu, Mar 2, 2023 at 4:10âPM Michael S. Tsirkin <mst@redhat.com> wrote: > > > > > > > > On Thu, Mar 02, 2023 at 03:57:10PM +0800, Jason Wang wrote: > > > > > Kernel had already used the eBPF program for hashing, classifying > > > > > various types of eBPF program other than XDP/socket filter > > > > > (pass/drop). > > > > > > > > > > Thanks > > > > > > > > where is it used for hashing? > > > > > > I can see it is used by team/lb: > > > > > > static unsigned int lb_get_skb_hash(struct lb_priv *lb_priv, > > > struct sk_buff *skb) > > > { > > > struct bpf_prog *fp; > > > uint32_t lhash; > > > unsigned char *c; > > > > > > fp = rcu_dereference_bh(lb_priv->fp); > > > if (unlikely(!fp)) > > > return 0; > > > lhash = bpf_prog_run(fp, skb); > > > c = (char *) &lhash; > > > return c[0] ^ c[1] ^ c[2] ^ c[3]; > > > } > > > > > > But the point is that the return value is determined by the prog type > > > (or the context). > > > > > > Thanks > > > > OK so assuming we do this, how will users program this exactly? > > For DPDK users, it could be integrated with the PMD. > For kernel ueres, it probably requires a virtio specific netlink or char device. > > > Given this is not standard, which tools will be used to attach such > > a program to the device? > > vDPA tool? > > Thanks Ugh. I think I'd like ethtool to work. > > > > > > > > > > > > -- > > > > MST > > > > > > > > > > > > --------------------------------------------------------------------- > > > > To unsubscribe, e-mail: virtio-dev-unsubscribe@lists.oasis-open.org > > > > For additional commands, e-mail: virtio-dev-help@lists.oasis-open.org > > > > > >
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