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Date: Thu, 27 Jul 2023 16:43:27 +0200
From: Alexander Lobakin <aleksander.lobakin@...el.com>
To: "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>
Cc: Alexander Lobakin <aleksander.lobakin@...el.com>,
Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
Larysa Zaremba <larysa.zaremba@...el.com>,
Yunsheng Lin <linyunsheng@...wei.com>,
Alexander Duyck <alexanderduyck@...com>,
Jesper Dangaard Brouer <hawk@...nel.org>,
Ilias Apalodimas <ilias.apalodimas@...aro.org>,
Simon Horman <simon.horman@...igine.com>,
netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH net-next 0/9] page_pool: a couple of assorted optimizations
That initially was a spin-off of the IAVF PP series[0], but has grown since
then a bunch. In fact, it consists of 4 semi-independent blocks:
* #1-2: Compile-time optimization. Split page_pool.h into 2 headers to
not overbloat the consumers not needing complex inline helpers and
then stop including it in skbuff.h at all. The first patch is also
prereq for the whole series.
* #3: Improve cacheline locality for users of the Page Pool frag API.
* #4-6: Don't call DMA API when it would end with a no-op, i.e. on
systems with coherent DMA and w/o enabled IOMMU or swiotlb.
* #7-9: Use direct cache recycling more aggressively, when it is safe
obviously. In addition, make sure nobody wants to use Page Pool API
with disabled interrupts.
Patches #1 and #8 are authored by Yunsheng and Jakub respectively, with
small modifications from my side as per ML discussions.
For the perf numbers for #3-9, please see individual commit messages.
[0] https://lore.kernel.org/netdev/20230530150035.1943669-1-aleksander.lobakin@intel.com
Alexander Lobakin (7):
net: skbuff: don't include <net/page_pool/types.h> to <linux/skbuff.h>
page_pool: place frag_* fields in one cacheline
page_pool: shrink &page_pool_params a tiny bit
page_pool: don't use driver-set flags field directly
page_pool: avoid calling no-op externals when possible
net: skbuff: avoid accessing page_pool if !napi_safe when returning
page
net: skbuff: always try to recycle PP pages directly when in softirq
Jakub Kicinski (1):
page_pool: add a lockdep check for recycling in hardirq
Yunsheng Lin (1):
page_pool: split types and declarations from page_pool.h
MAINTAINERS | 3 +-
drivers/net/ethernet/broadcom/bnxt/bnxt.c | 2 +-
drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c | 2 +-
drivers/net/ethernet/engleder/tsnep_main.c | 1 +
drivers/net/ethernet/freescale/fec_main.c | 1 +
.../net/ethernet/hisilicon/hns3/hns3_enet.c | 1 +
.../net/ethernet/hisilicon/hns3/hns3_enet.h | 2 +-
drivers/net/ethernet/marvell/mvneta.c | 2 +-
drivers/net/ethernet/marvell/mvpp2/mvpp2.h | 2 +-
.../net/ethernet/marvell/mvpp2/mvpp2_main.c | 1 +
.../marvell/octeontx2/nic/otx2_common.c | 1 +
.../ethernet/marvell/octeontx2/nic/otx2_pf.c | 1 +
drivers/net/ethernet/mediatek/mtk_eth_soc.c | 1 +
drivers/net/ethernet/mediatek/mtk_eth_soc.h | 2 +-
.../ethernet/mellanox/mlx5/core/en/params.c | 1 +
.../net/ethernet/mellanox/mlx5/core/en/trap.c | 1 -
.../net/ethernet/mellanox/mlx5/core/en/xdp.c | 1 +
.../net/ethernet/mellanox/mlx5/core/en_main.c | 2 +-
.../net/ethernet/mellanox/mlx5/core/en_rx.c | 2 +-
.../ethernet/mellanox/mlx5/core/en_stats.c | 2 +-
.../ethernet/microchip/lan966x/lan966x_fdma.c | 1 +
.../ethernet/microchip/lan966x/lan966x_main.h | 2 +-
drivers/net/ethernet/socionext/netsec.c | 2 +-
drivers/net/ethernet/stmicro/stmmac/stmmac.h | 2 +-
.../net/ethernet/stmicro/stmmac/stmmac_main.c | 1 +
drivers/net/ethernet/ti/cpsw.c | 2 +-
drivers/net/ethernet/ti/cpsw_new.c | 2 +-
drivers/net/ethernet/ti/cpsw_priv.c | 2 +-
drivers/net/ethernet/wangxun/libwx/wx_lib.c | 2 +-
drivers/net/veth.c | 2 +-
drivers/net/wireless/mediatek/mt76/mac80211.c | 1 -
drivers/net/wireless/mediatek/mt76/mt76.h | 1 +
drivers/net/xen-netfront.c | 2 +-
include/linux/lockdep.h | 7 +
include/linux/skbuff.h | 3 +-
include/net/page_pool/helpers.h | 193 +++++++++++++++
.../net/{page_pool.h => page_pool/types.h} | 221 ++----------------
include/trace/events/page_pool.h | 2 +-
net/bpf/test_run.c | 2 +-
net/core/page_pool.c | 81 ++-----
net/core/skbuff.c | 45 +++-
net/core/xdp.c | 2 +-
42 files changed, 325 insertions(+), 284 deletions(-)
create mode 100644 include/net/page_pool/helpers.h
rename include/net/{page_pool.h => page_pool/types.h} (50%)
---
Yunsheng, Jakub, pls make sure you agree with your patches that went
into the series, as both were modified :z
>From RFC v2[1]:
* drop the dependency on the hybrid allocation series (and thus the
"RFC" prefix) -- it wasn't a strict dep and it's not in the trees yet;
* add [slightly reworked] Yunsheng's patch which splits page_pool.h into
2 headers -- merge conflict hell otherwise.
Also fix a typo while nobody looks (Simon);
* #3 (former #2): word the commitmsg a bit better, mention the main
reason for the change more clearly (Ilias);
* add Jakub's hardirq assertion as a prereq for the last patch;
* #9 (former #7): add comment mentioning that the hardirq case is not
checked due to the assertion checking it later (yes, it is illegal to
use Page Pool with the interrupts disabled or when in TH) (Jakub);
>From RFC v1[2]:
* #1: move the entire function to skbuff.c, don't try to split it (Alex);
* #2-4: new;
* #5: use internal flags field added in #4 and don't modify driver-defined
structure (Alex, Jakub);
* #6: new;
* drop "add new NAPI state" as a redundant complication;
* #7: replace the check for the new NAPI state to just in_softirq(), should
be fine (Jakub).
[1] https://lore.kernel.org/netdev/20230714170853.866018-1-aleksander.lobakin@intel.com
[2] https://lore.kernel.org/netdev/20230629152305.905962-1-aleksander.lobakin@intel.com
--
2.41.0
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