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Date: Fri, 24 Nov 2023 16:47:18 +0100 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>, Michal Kubiak <michal.kubiak@...el.com>, Larysa Zaremba <larysa.zaremba@...el.com>, Alexander Duyck <alexanderduyck@...com>, Yunsheng Lin <linyunsheng@...wei.com>, David Christensen <drc@...ux.vnet.ibm.com>, Jesper Dangaard Brouer <hawk@...nel.org>, Ilias Apalodimas <ilias.apalodimas@...aro.org>, Paul Menzel <pmenzel@...gen.mpg.de>, netdev@...r.kernel.org, intel-wired-lan@...ts.osuosl.org, linux-kernel@...r.kernel.org Subject: [PATCH net-next v5 00/14] net: intel: start The Great Code Dedup + Page Pool for iavf Here's a two-shot: introduce Intel Ethernet common library (libie) and switch iavf to Page Pool. Details are in the commit messages; here's a summary: Not a secret there's a ton of code duplication between two and more Intel ethernet modules. Before introducing new changes, which would need to be copied over again, start decoupling the already existing duplicate functionality into a new module, which will be shared between several Intel Ethernet drivers. The first name that came to my mind was "libie" -- "Intel Ethernet common library". Also this sounds like "lovelie" (-> one word, no "lib I E" pls) and can be expanded as "lib Internet Explorer" :P The series is only the beginning. From now on, adding every new feature or doing any good driver refactoring will remove much more lines than add for quite some time. There's a basic roadmap with some deduplications planned already, not speaking of that touching every line now asks: "can I share this?". The final destination is very ambitious: have only one unified driver for at least i40e, ice, iavf, and idpf with a struct ops for each generation. That's never gonna happen, right? But you still can at least try. PP conversion for iavf lands within the same series as these two are tied closely. libie will support Page Pool model only, so that a driver can't use much of the lib until it's converted. iavf is only the example, the rest will eventually be converted soon on a per-driver basis. That is when it gets really interesting. Stay tech. Alexander Lobakin (14): page_pool: make sure frag API fields don't span between cachelines page_pool: don't use driver-set flags field directly page_pool: avoid calling no-op externals when possible net: intel: introduce Intel Ethernet common library iavf: kill "legacy-rx" for good iavf: drop page splitting and recycling page_pool: constify some read-only function arguments page_pool: add DMA-sync-for-CPU inline helpers libie: add Rx buffer management (via Page Pool) iavf: pack iavf_ring more efficiently iavf: switch to Page Pool libie: add common queue stats libie: add per-queue Page Pool stats iavf: switch queue stats to libie MAINTAINERS | 3 +- drivers/net/ethernet/intel/Kconfig | 6 + drivers/net/ethernet/intel/Makefile | 1 + drivers/net/ethernet/intel/i40e/i40e_common.c | 253 ------- drivers/net/ethernet/intel/i40e/i40e_main.c | 1 + .../net/ethernet/intel/i40e/i40e_prototype.h | 7 - drivers/net/ethernet/intel/i40e/i40e_txrx.c | 72 +- drivers/net/ethernet/intel/i40e/i40e_type.h | 88 --- drivers/net/ethernet/intel/iavf/iavf.h | 2 +- drivers/net/ethernet/intel/iavf/iavf_common.c | 253 ------- .../net/ethernet/intel/iavf/iavf_ethtool.c | 241 +------ drivers/net/ethernet/intel/iavf/iavf_main.c | 42 +- .../net/ethernet/intel/iavf/iavf_prototype.h | 7 - drivers/net/ethernet/intel/iavf/iavf_txrx.c | 626 ++++-------------- drivers/net/ethernet/intel/iavf/iavf_txrx.h | 174 +---- drivers/net/ethernet/intel/iavf/iavf_type.h | 90 --- .../net/ethernet/intel/iavf/iavf_virtchnl.c | 17 +- .../net/ethernet/intel/ice/ice_lan_tx_rx.h | 316 --------- drivers/net/ethernet/intel/ice/ice_main.c | 1 + drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 74 +-- drivers/net/ethernet/intel/libie/Kconfig | 9 + drivers/net/ethernet/intel/libie/Makefile | 7 + drivers/net/ethernet/intel/libie/internal.h | 20 + drivers/net/ethernet/intel/libie/rx.c | 188 ++++++ drivers/net/ethernet/intel/libie/stats.c | 190 ++++++ include/linux/net/intel/libie/rx.h | 263 ++++++++ include/linux/net/intel/libie/stats.h | 213 ++++++ include/net/page_pool/helpers.h | 115 +++- include/net/page_pool/types.h | 10 +- net/core/page_pool.c | 50 +- 30 files changed, 1270 insertions(+), 2069 deletions(-) create mode 100644 drivers/net/ethernet/intel/libie/Kconfig create mode 100644 drivers/net/ethernet/intel/libie/Makefile create mode 100644 drivers/net/ethernet/intel/libie/internal.h create mode 100644 drivers/net/ethernet/intel/libie/rx.c create mode 100644 drivers/net/ethernet/intel/libie/stats.c create mode 100644 include/linux/net/intel/libie/rx.h create mode 100644 include/linux/net/intel/libie/stats.h --- Directly to net-next, has non-Intel code changes :p >From v4[0]: * make use of Jakub's &page_pool_params split; * #01: prevent frag fields from spanning into 2 cachelines after splitting &page_pool_params into fast and slow; * #02-03: bring back the DMA sync shortcut, now as a per-page flag (me, Yunsheng); * #04: let libie have its own Kconfig to stop further bloating of poor intel/Kconfig; * #06: merge page split-reuse-recycle drop into one commit (Alex); * #07: decouple constifying of several Page Pool function arguments into a separate commit, constify some more; * #09: stop abusing internal PP fields in the driver code (Yunsheng); * #09: calculate DMA sync size (::max_len) correctly: within one page, not one buffer (Yunsheng); * #10: decouple rearranging &iavf_ring into separate commit, optimize it even more; * #11: let the driver get back to the last descriptor to process after an skb allocation fail, don't drop it (Alex); * #11: stop touching unrelated stuff like watchdog timeout etc. (Alex); * fix "Return:" in the kdoc (now `W=12 C=1` is clean), misc typos. >From v3[1]: * base on the latest net-next, update bloat-o-meter and perf stats; * split generic PP optimizations into a separate series; * drop "optimize hotpath a bunch" commit: a lot of [controversial] changes in one place, worth own series (Alex); * 02: pick Rev-by (Alex); * 03: move in-place recycling removal here from the dropped patch; * 05: new, add libie Rx buffer API separatelly from IAVF changes; * 05-06: use new "hybrid" allocation API from[2] to reduce memory usage when a page can fit more than 1 truesize (also asked by David); * 06: merge with "always use order-0 page" commit to reduce diffs and simplify things (Alex); * 09: fix page_alloc_fail counter. >From v2[3]: * 0006: fix page_pool.h include in OcteonTX2 files (Jakub, Patchwork); * no functional changes. >From v1[4]: * 0006: new (me, Jakub); * 0008: give the helpers more intuitive names (Jakub, Ilias); * -^-: also expand their kdoc a bit for the same reason; * -^-: fix kdoc copy-paste issue (Patchwork, Jakub); * 0011: drop `inline` from C file (Patchwork, Jakub). [0] https://lore.kernel.org/netdev/20230705155551.1317583-1-aleksander.lobakin@intel.com [1] https://lore.kernel.org/netdev/20230530150035.1943669-1-aleksander.lobakin@intel.com [2] https://lore.kernel.org/netdev/20230629120226.14854-1-linyunsheng@huawei.com [3] https://lore.kernel.org/netdev/20230525125746.553874-1-aleksander.lobakin@intel.com [4] https://lore.kernel.org/netdev/20230516161841.37138-1-aleksander.lobakin@intel.com -- 2.42.0
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