From: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
To: "Toke Høiland-Jørgensen" <toke@redhat.com>
Cc: Lorenzo Bianconi <lorenzo@kernel.org>,
bpf@vger.kernel.org, netdev@vger.kernel.org, davem@davemloft.net,
kuba@kernel.org, ast@kernel.org, daniel@iogearbox.net,
shayagr@amazon.com, john.fastabend@gmail.com, dsahern@kernel.org,
brouer@redhat.com, echaudro@redhat.com, jasowang@redhat.com,
alexander.duyck@gmail.com, saeed@kernel.org,
maciej.fijalkowski@intel.com, magnus.karlsson@intel.com,
tirthendu.sarkar@intel.com
Subject: Re: [PATCH v11 bpf-next 17/18] net: xdp: introduce bpf_xdp_adjust_data helper
Date: Wed, 18 Aug 2021 14:47:30 +0200 [thread overview]
Message-ID: <YR0BYiQFvI8cmOJU@lore-desk> (raw)
In-Reply-To: <87czqbq6ic.fsf@toke.dk>
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> Lorenzo Bianconi <lorenzo@kernel.org> writes:
>
[...]
> > + * Description
> > + * For XDP frames split over multiple buffers, the
> > + * *xdp_md*\ **->data** and*xdp_md *\ **->data_end** pointers
> > + * will point to the start and end of the first fragment only.
> > + * This helper can be used to access subsequent fragments by
> > + * moving the data pointers. To use, an XDP program can call
> > + * this helper with the byte offset of the packet payload that
> > + * it wants to access; the helper will move *xdp_md*\ **->data**
> > + * and *xdp_md *\ **->data_end** so they point to the requested
> > + * payload offset and to the end of the fragment containing this
> > + * byte offset, and return the byte offset of the start of the
> > + * fragment.
>
> This comment is wrong now :)
actually we are still returning the byte offset of the start of the fragment
(base_offset).
Lorenzo
>
> -Toke
>
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next prev parent reply other threads:[~2021-08-18 12:47 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-13 11:47 [PATCH v11 bpf-next 00/18] mvneta: introduce XDP multi-buffer support Lorenzo Bianconi
2021-08-13 11:47 ` [PATCH v11 bpf-next 01/18] net: skbuff: add size metadata to skb_shared_info for xdp Lorenzo Bianconi
2021-08-13 11:47 ` [PATCH v11 bpf-next 02/18] xdp: introduce flags field in xdp_buff/xdp_frame Lorenzo Bianconi
2021-08-13 11:47 ` [PATCH v11 bpf-next 03/18] net: mvneta: update mb bit before passing the xdp buffer to eBPF layer Lorenzo Bianconi
2021-08-13 11:47 ` [PATCH v11 bpf-next 04/18] net: mvneta: simplify mvneta_swbm_add_rx_fragment management Lorenzo Bianconi
2021-08-13 11:47 ` [PATCH v11 bpf-next 05/18] net: xdp: add xdp_update_skb_shared_info utility routine Lorenzo Bianconi
2021-08-13 11:47 ` [PATCH v11 bpf-next 06/18] net: marvell: rely on " Lorenzo Bianconi
2021-08-13 11:47 ` [PATCH v11 bpf-next 07/18] xdp: add multi-buff support to xdp_return_{buff/frame} Lorenzo Bianconi
2021-08-13 11:47 ` [PATCH v11 bpf-next 08/18] net: mvneta: add multi buffer support to XDP_TX Lorenzo Bianconi
2021-08-13 11:47 ` [PATCH v11 bpf-next 09/18] net: mvneta: enable jumbo frames for XDP Lorenzo Bianconi
2021-08-13 11:47 ` [PATCH v11 bpf-next 10/18] bpf: add multi-buff support to the bpf_xdp_adjust_tail() API Lorenzo Bianconi
2021-08-13 11:47 ` [PATCH v11 bpf-next 11/18] bpf: introduce bpf_xdp_get_buff_len helper Lorenzo Bianconi
2021-08-13 15:18 ` kernel test robot
2021-08-13 15:18 ` [RFC PATCH] bpf: bpf_xdp_get_buff_len_proto can be static kernel test robot
2021-08-13 11:47 ` [PATCH v11 bpf-next 12/18] bpf: add multi-buffer support to xdp copy helpers Lorenzo Bianconi
2021-08-13 11:47 ` [PATCH v11 bpf-next 13/18] bpf: move user_size out of bpf_test_init Lorenzo Bianconi
2021-08-13 11:47 ` [PATCH v11 bpf-next 14/18] bpf: introduce multibuff support to bpf_prog_test_run_xdp() Lorenzo Bianconi
2021-08-13 11:47 ` [PATCH v11 bpf-next 15/18] bpf: test_run: add xdp_shared_info pointer in bpf_test_finish signature Lorenzo Bianconi
2021-08-13 11:47 ` [PATCH v11 bpf-next 16/18] bpf: update xdp_adjust_tail selftest to include multi-buffer Lorenzo Bianconi
2021-08-13 11:47 ` [PATCH v11 bpf-next 17/18] net: xdp: introduce bpf_xdp_adjust_data helper Lorenzo Bianconi
2021-08-18 12:31 ` Toke Høiland-Jørgensen
2021-08-18 12:47 ` Lorenzo Bianconi [this message]
2021-08-18 12:58 ` Toke Høiland-Jørgensen
2021-08-18 13:37 ` Lorenzo Bianconi
2021-08-13 11:47 ` [PATCH v11 bpf-next 18/18] bpf: add bpf_xdp_adjust_data selftest Lorenzo Bianconi
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