[net-next,v9,7/9] libeth: add Rx buffer management

Message ID	20240404154402.3581254-8-aleksander.lobakin@intel.com (mailing list archive)
State	New
Headers	show Return-Path: <owner-linux-mm@kvack.org> From: Alexander Lobakin <aleksander.lobakin@intel.com> To: "David S. Miller" <davem@davemloft.net>, Eric Dumazet <edumazet@google.com>, Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com> Cc: Alexander Lobakin <aleksander.lobakin@intel.com>, Alexander Duyck <alexanderduyck@fb.com>, Yunsheng Lin <linyunsheng@huawei.com>, Jesper Dangaard Brouer <hawk@kernel.org>, Ilias Apalodimas <ilias.apalodimas@linaro.org>, Christoph Lameter <cl@linux.com>, Vlastimil Babka <vbabka@suse.cz>, Andrew Morton <akpm@linux-foundation.org>, nex.sw.ncis.osdt.itp.upstreaming@intel.com, netdev@vger.kernel.org, intel-wired-lan@lists.osuosl.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH net-next v9 7/9] libeth: add Rx buffer management Date: Thu, 4 Apr 2024 17:44:00 +0200 Message-ID: <20240404154402.3581254-8-aleksander.lobakin@intel.com> In-Reply-To: <20240404154402.3581254-1-aleksander.lobakin@intel.com> References: <20240404154402.3581254-1-aleksander.lobakin@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: owner-linux-mm@kvack.org Precedence: bulk
Series	net: intel: start The Great Code Dedup + Page Pool for iavf \| expand [net-next,v9,0/9] net: intel: start The Great Code Dedup + Page Pool for iavf [net-next,v9,1/9] net: intel: introduce {,Intel} Ethernet common library [net-next,v9,2/9] iavf: kill "legacy-rx" for good [net-next,v9,3/9] iavf: drop page splitting and recycling [net-next,v9,4/9] slab: introduce kvmalloc_array_node() and kvcalloc_node() [net-next,v9,5/9] page_pool: constify some read-only function arguments [net-next,v9,6/9] page_pool: add DMA-sync-for-CPU inline helper [net-next,v9,7/9] libeth: add Rx buffer management [net-next,v9,8/9] iavf: pack iavf_ring more efficiently [net-next,v9,9/9] iavf: switch to Page Pool

diff --git a/drivers/net/ethernet/intel/libeth/Kconfig b/drivers/net/ethernet/intel/libeth/Kconfig index af970a63c227..480293b71dbc 100644 --- a/drivers/net/ethernet/intel/libeth/Kconfig +++ b/drivers/net/ethernet/intel/libeth/Kconfig @@ -3,6 +3,7 @@ config LIBETH tristate + select PAGE_POOL help libeth is a common library containing routines shared between several drivers, but not yet promoted to the generic kernel API. diff --git a/include/net/libeth/rx.h b/include/net/libeth/rx.h index aaf9c2cdf7fd..3db2bda4eab6 100644 --- a/include/net/libeth/rx.h +++ b/include/net/libeth/rx.h @@ -4,8 +4,125 @@ #ifndef __LIBETH_RX_H #define __LIBETH_RX_H +#include <linux/if_vlan.h> + +#include <net/page_pool/helpers.h> #include <net/xdp.h> +/* Rx buffer management */ + +/* Space reserved in front of each frame */ +#define LIBETH_SKB_HEADROOM (NET_SKB_PAD + NET_IP_ALIGN) +/* Maximum headroom for worst-case calculations */ +#define LIBETH_MAX_HEADROOM LIBETH_SKB_HEADROOM +/* Link layer / L2 overhead: Ethernet, 2 VLAN tags (C + S), FCS */ +#define LIBETH_RX_LL_LEN (ETH_HLEN + 2 * VLAN_HLEN + ETH_FCS_LEN) + +/* Always use order-0 pages */ +#define LIBETH_RX_PAGE_ORDER 0 +/* Pick a sane buffer stride and align to a cacheline boundary */ +#define LIBETH_RX_BUF_STRIDE SKB_DATA_ALIGN(128) +/* HW-writeable space in one buffer: truesize - headroom/tailroom, aligned */ +#define LIBETH_RX_PAGE_LEN(hr) \ + ALIGN_DOWN(SKB_MAX_ORDER(hr, LIBETH_RX_PAGE_ORDER), \ + LIBETH_RX_BUF_STRIDE) + +/** + * struct libeth_fqe - structure representing an Rx buffer + * @page: page holding the buffer + * @offset: offset from the page start (to the headroom) + * @truesize: total space occupied by the buffer (w/ headroom and tailroom) + * + * Depending on the MTU, API switches between one-page-per-frame and shared + * page model (to conserve memory on bigger-page platforms). In case of the + * former, @offset is always 0 and @truesize is always ```PAGE_SIZE```. + */ +struct libeth_fqe { + struct page *page; + u32 offset; + u32 truesize; +} __aligned_largest; + +/** + * struct libeth_fq - structure representing a buffer queue + * @fp: hotpath part of the structure + * @pp: &page_pool for buffer management + * @fqes: array of Rx buffers + * @truesize: size to allocate per buffer, w/overhead + * @count: number of descriptors/buffers the queue has + * @buf_len: HW-writeable length per each buffer + * @nid: ID of the closest NUMA node with memory + */ +struct libeth_fq { + struct_group_tagged(libeth_fq_fp, fp, + struct page_pool *pp; + struct libeth_fqe *fqes; + + u32 truesize; + u32 count; + ); + + /* Cold fields */ + u32 buf_len; + int nid; +}; + +int libeth_rx_fq_create(struct libeth_fq *fq, struct napi_struct *napi); +void libeth_rx_fq_destroy(struct libeth_fq *fq); + +/** + * libeth_rx_alloc - allocate a new Rx buffer + * @fq: buffer queue to allocate for + * @i: index of the buffer within the queue + * + * Return: DMA address to be passed to HW for Rx on successful allocation, + * ```DMA_MAPPING_ERROR``` otherwise. + */ +static inline dma_addr_t libeth_rx_alloc(const struct libeth_fq_fp *fq, u32 i) +{ + struct libeth_fqe *buf = &fq->fqes[i]; + + buf->truesize = fq->truesize; + buf->page = page_pool_dev_alloc(fq->pp, &buf->offset, &buf->truesize); + if (unlikely(!buf->page)) + return DMA_MAPPING_ERROR; + + return page_pool_get_dma_addr(buf->page) + buf->offset + + fq->pp->p.offset; +} + +void libeth_rx_recycle_slow(struct page *page); + +/** + * libeth_rx_sync_for_cpu - synchronize or recycle buffer post DMA + * @fqe: buffer to process + * @len: frame length from the descriptor + * + * Process the buffer after it's written by HW. The regular path is to + * synchronize DMA for CPU, but in case of no data it will be immediately + * recycled back to its PP. + * + * Return: true when there's data to process, false otherwise. + */ +static inline bool libeth_rx_sync_for_cpu(const struct libeth_fqe *fqe, + u32 len) +{ + struct page *page = fqe->page; + + /* Very rare, but possible case. The most common reason: + * the last fragment contained FCS only, which was then + * stripped by the HW. + */ + if (unlikely(!len)) { + libeth_rx_recycle_slow(page); + return false; + } + + page_pool_dma_sync_for_cpu(page->pp, page, fqe->offset, len); + + return true; +} + /* Converting abstract packet type numbers into a software structure with * the packet parameters to do O(1) lookup on Rx. */ diff --git a/drivers/net/ethernet/intel/libeth/rx.c b/drivers/net/ethernet/intel/libeth/rx.c index 86f17e29b47d..a557a1ebcbe5 100644 --- a/drivers/net/ethernet/intel/libeth/rx.c +++ b/drivers/net/ethernet/intel/libeth/rx.c @@ -3,6 +3,104 @@ #include <net/libeth/rx.h> +/* Rx buffer management */ + +/** + * libeth_rx_hw_len - get the actual buffer size to be passed to HW + * @pp: &page_pool_params of the netdev to calculate the size for + * @max_len: maximum buffer size for a single descriptor + * + * Return: HW-writeable length per one buffer to pass it to the HW accounting: + * MTU the @dev has, HW required alignment, minimum and maximum allowed values, + * and system's page size. + */ +static u32 libeth_rx_hw_len(const struct page_pool_params *pp, u32 max_len) +{ + u32 len; + + len = READ_ONCE(pp->netdev->mtu) + LIBETH_RX_LL_LEN; + len = ALIGN(len, LIBETH_RX_BUF_STRIDE); + len = min3(len, ALIGN_DOWN(max_len ? : U32_MAX, LIBETH_RX_BUF_STRIDE), + pp->max_len); + + return len; +} + +/** + * libeth_rx_fq_create - create a PP with the default libeth settings + * @fq: buffer queue struct to fill + * @napi: &napi_struct covering this PP (no usage outside its poll loops) + * + * Return: %0 on success, -%errno on failure. + */ +int libeth_rx_fq_create(struct libeth_fq *fq, struct napi_struct *napi) +{ + struct page_pool_params pp = { + .flags = PP_FLAG_DMA_MAP | PP_FLAG_DMA_SYNC_DEV, + .order = LIBETH_RX_PAGE_ORDER, + .pool_size = fq->count, + .nid = fq->nid, + .dev = napi->dev->dev.parent, + .netdev = napi->dev, + .napi = napi, + .dma_dir = DMA_FROM_DEVICE, + .offset = LIBETH_SKB_HEADROOM, + }; + struct libeth_fqe *fqes; + struct page_pool *pool; + + /* HW-writeable / syncable length per one page */ + pp.max_len = LIBETH_RX_PAGE_LEN(pp.offset); + + /* HW-writeable length per buffer */ + fq->buf_len = libeth_rx_hw_len(&pp, fq->buf_len); + /* Buffer size to allocate */ + fq->truesize = roundup_pow_of_two(SKB_HEAD_ALIGN(pp.offset + + fq->buf_len)); + + pool = page_pool_create(&pp); + if (IS_ERR(pool)) + return PTR_ERR(pool); + + fqes = kvcalloc_node(fq->count, sizeof(*fqes), GFP_KERNEL, fq->nid); + if (!fqes) + goto err_buf; + + fq->fqes = fqes; + fq->pp = pool; + + return 0; + +err_buf: + page_pool_destroy(pool); + + return -ENOMEM; +} +EXPORT_SYMBOL_NS_GPL(libeth_rx_fq_create, LIBETH); + +/** + * libeth_rx_fq_destroy - destroy a &page_pool created by libeth + * @fq: buffer queue to process + */ +void libeth_rx_fq_destroy(struct libeth_fq *fq) +{ + kvfree(fq->fqes); + page_pool_destroy(fq->pp); +} +EXPORT_SYMBOL_NS_GPL(libeth_rx_fq_destroy, LIBETH); + +/** + * libeth_rx_recycle_slow - recycle a libeth page from the NAPI context + * @page: page to recycle + * + * To be used on exceptions or rare cases not requiring fast inline recycling. + */ +void libeth_rx_recycle_slow(struct page *page) +{ + page_pool_recycle_direct(page->pp, page); +} +EXPORT_SYMBOL_NS_GPL(libeth_rx_recycle_slow, LIBETH); + /* Converting abstract packet type numbers into a software structure with * the packet parameters to do O(1) lookup on Rx. */

[net-next,v9,7/9] libeth: add Rx buffer management

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