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From: John Fastabend <john.fastabend@gmail.com>
To: Lorenzo Bianconi <lorenzo@kernel.org>,
	bpf@vger.kernel.org, netdev@vger.kernel.org
Cc: lorenzo.bianconi@redhat.com, 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, toke@redhat.com
Subject: RE: [PATCH v12 bpf-next 05/18] net: xdp: add xdp_update_skb_shared_info utility routine
Date: Tue, 31 Aug 2021 16:38:52 -0700	[thread overview]
Message-ID: <612ebd8c6484_6b87208a3@john-XPS-13-9370.notmuch> (raw)
In-Reply-To: <3d98cda6f49ef9ff34d2aec3d00924592b4739e3.1629473233.git.lorenzo@kernel.org>

Lorenzo Bianconi wrote:
> Introduce xdp_update_skb_shared_info routine to update frags array
> metadata in skb_shared_info data structure converting to a skb from
> a xdp_buff or xdp_frame.
> According to the current skb_shared_info architecture in
> xdp_frame/xdp_buff and to the xdp multi-buff support, there is
> no need to run skb_add_rx_frag() and reset frags array converting the buffer
> to a skb since the frag array will be in the same position for xdp_buff/xdp_frame
> and for the skb, we just need to update memory metadata.
> Introduce XDP_FLAGS_PF_MEMALLOC flag in xdp_buff_flags in order to mark
> the xdp_buff or xdp_frame as under memory-pressure if pages of the frags array
> are under memory pressure. Doing so we can avoid looping over all fragments in
> xdp_update_skb_shared_info routine. The driver is expected to set the
> flag constructing the xdp_buffer using xdp_buff_set_frag_pfmemalloc
> utility routine.
> Rely on xdp_update_skb_shared_info in __xdp_build_skb_from_frame routine
> converting the multi-buff xdp_frame to a skb after performing a XDP_REDIRECT.
> 
> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>

Acked-by: John Fastabend <john.fastabend@gmail.com>

  reply	other threads:[~2021-08-31 23:39 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-20 15:40 [PATCH v12 bpf-next 00/18] mvneta: introduce XDP multi-buffer support Lorenzo Bianconi
2021-08-20 15:40 ` [PATCH v12 bpf-next 01/18] net: skbuff: add size metadata to skb_shared_info for xdp Lorenzo Bianconi
2021-08-31 23:13   ` John Fastabend
2021-09-03 17:13     ` Lorenzo Bianconi
2021-08-20 15:40 ` [PATCH v12 bpf-next 02/18] xdp: introduce flags field in xdp_buff/xdp_frame Lorenzo Bianconi
2021-08-31 23:15   ` John Fastabend
2021-08-20 15:40 ` [PATCH v12 bpf-next 03/18] net: mvneta: update mb bit before passing the xdp buffer to eBPF layer Lorenzo Bianconi
2021-08-31 23:23   ` John Fastabend
2021-09-03 17:23     ` Lorenzo Bianconi
2021-08-20 15:40 ` [PATCH v12 bpf-next 04/18] net: mvneta: simplify mvneta_swbm_add_rx_fragment management Lorenzo Bianconi
2021-08-31 23:34   ` John Fastabend
2021-08-20 15:40 ` [PATCH v12 bpf-next 05/18] net: xdp: add xdp_update_skb_shared_info utility routine Lorenzo Bianconi
2021-08-31 23:38   ` John Fastabend [this message]
2021-08-20 15:40 ` [PATCH v12 bpf-next 06/18] net: marvell: rely on " Lorenzo Bianconi
2021-08-31 23:41   ` John Fastabend
2021-09-03 17:27     ` Lorenzo Bianconi
2021-08-20 15:40 ` [PATCH v12 bpf-next 07/18] xdp: add multi-buff support to xdp_return_{buff/frame} Lorenzo Bianconi
2021-08-31 23:43   ` John Fastabend
2021-08-20 15:40 ` [PATCH v12 bpf-next 08/18] net: mvneta: add multi buffer support to XDP_TX Lorenzo Bianconi
2021-08-31 23:44   ` John Fastabend
2021-08-20 15:40 ` [PATCH v12 bpf-next 09/18] net: mvneta: enable jumbo frames for XDP Lorenzo Bianconi
2021-08-31 23:45   ` John Fastabend
2021-08-20 15:40 ` [PATCH v12 bpf-next 10/18] bpf: add multi-buff support to the bpf_xdp_adjust_tail() API Lorenzo Bianconi
2021-09-01  0:10   ` John Fastabend
2021-08-20 15:40 ` [PATCH v12 bpf-next 11/18] bpf: introduce bpf_xdp_get_buff_len helper Lorenzo Bianconi
2021-09-01  0:12   ` John Fastabend
2021-08-20 15:40 ` [PATCH v12 bpf-next 12/18] bpf: add multi-buffer support to xdp copy helpers Lorenzo Bianconi
2021-09-01  0:19   ` John Fastabend
2021-08-20 15:40 ` [PATCH v12 bpf-next 13/18] bpf: move user_size out of bpf_test_init Lorenzo Bianconi
2021-08-20 15:40 ` [PATCH v12 bpf-next 14/18] bpf: introduce multibuff support to bpf_prog_test_run_xdp() Lorenzo Bianconi
2021-08-20 15:40 ` [PATCH v12 bpf-next 15/18] bpf: test_run: add xdp_shared_info pointer in bpf_test_finish signature Lorenzo Bianconi
2021-08-20 15:40 ` [PATCH v12 bpf-next 16/18] bpf: update xdp_adjust_tail selftest to include multi-buffer Lorenzo Bianconi
2021-08-20 15:40 ` [PATCH v12 bpf-next 17/18] net: xdp: introduce bpf_xdp_adjust_data helper Lorenzo Bianconi
2021-09-01  0:36   ` John Fastabend
2021-09-03 17:57     ` Lorenzo Bianconi
2021-08-20 15:40 ` [PATCH v12 bpf-next 18/18] bpf: add bpf_xdp_adjust_data selftest Lorenzo Bianconi
2021-09-01  0:45 ` [PATCH v12 bpf-next 00/18] mvneta: introduce XDP multi-buffer support John Fastabend
2021-09-07  8:35   ` Lorenzo Bianconi

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