From 76f9aa6f4bfd12fba34fc44aef890c48d4fb1024 Mon Sep 17 00:00:00 2001 From: Jakov Petrina Date: Fri, 15 May 2020 12:52:35 +0200 Subject: linux: mvebu: backport mvneta XDP support This patch backports XDP support in the mvneta driver used by Marvell ARMADA 37x, 38x and 37xx series SoCs. Supported actions are: - XDP_DROP - XDP_PASS - XDP_REDIRECT - XDP_TX Patches are present upstream as following commits: * b0a43db9087a net: mvneta: add XDP_TX support * 9e58c8b41065 net: mvneta: make tx buffer array agnostic * fa383f6b77a2 net: mvneta: move header prefetch in mvneta_swbm_rx_frame * 0db51da7a8e9 net: mvneta: add basic XDP support * 8dc9a0888f4c net: mvneta: rely on build_skb in mvneta_rx_swbm poll routine * 568a3fa24a95 net: mvneta: introduce page pool API for sw buffer manager * ff519e2acd46 net: mvneta: introduce mvneta_update_stats routine Signed-off-by: Jakov Petrina --- ...introduce-page-pool-API-for-sw-buffer-man.patch | 181 +++++++++++++++++++++ 1 file changed, 181 insertions(+) create mode 100644 target/linux/mvebu/patches-5.4/011-net-mvneta-introduce-page-pool-API-for-sw-buffer-man.patch (limited to 'target/linux/mvebu/patches-5.4/011-net-mvneta-introduce-page-pool-API-for-sw-buffer-man.patch') diff --git a/target/linux/mvebu/patches-5.4/011-net-mvneta-introduce-page-pool-API-for-sw-buffer-man.patch b/target/linux/mvebu/patches-5.4/011-net-mvneta-introduce-page-pool-API-for-sw-buffer-man.patch new file mode 100644 index 0000000000..24c446f578 --- /dev/null +++ b/target/linux/mvebu/patches-5.4/011-net-mvneta-introduce-page-pool-API-for-sw-buffer-man.patch @@ -0,0 +1,181 @@ +From 160f006a6fe904177cbca867c48dfb6d27262dd5 Mon Sep 17 00:00:00 2001 +From: Lorenzo Bianconi +Date: Sat, 19 Oct 2019 10:13:22 +0200 +Subject: [PATCH 2/7] net: mvneta: introduce page pool API for sw buffer + manager + +Use the page_pool api for allocations and DMA handling instead of +__dev_alloc_page()/dma_map_page() and free_page()/dma_unmap_page(). +Pages are unmapped using page_pool_release_page before packets +go into the network stack. + +The page_pool API offers buffer recycling capabilities for XDP but +allocates one page per packet, unless the driver splits and manages +the allocated page. +This is a preliminary patch to add XDP support to mvneta driver + +Signed-off-by: Ilias Apalodimas +Signed-off-by: Jesper Dangaard Brouer +Signed-off-by: Lorenzo Bianconi +Signed-off-by: David S. Miller +--- + drivers/net/ethernet/marvell/Kconfig | 1 + + drivers/net/ethernet/marvell/mvneta.c | 83 +++++++++++++++++++++------ + 2 files changed, 65 insertions(+), 19 deletions(-) + +--- a/drivers/net/ethernet/marvell/Kconfig ++++ b/drivers/net/ethernet/marvell/Kconfig +@@ -61,6 +61,7 @@ config MVNETA + depends on ARCH_MVEBU || COMPILE_TEST + select MVMDIO + select PHYLINK ++ select PAGE_POOL + ---help--- + This driver supports the network interface units in the + Marvell ARMADA XP, ARMADA 370, ARMADA 38x and +--- a/drivers/net/ethernet/marvell/mvneta.c ++++ b/drivers/net/ethernet/marvell/mvneta.c +@@ -37,6 +37,7 @@ + #include + #include + #include ++#include + + /* Registers */ + #define MVNETA_RXQ_CONFIG_REG(q) (0x1400 + ((q) << 2)) +@@ -605,6 +606,10 @@ struct mvneta_rx_queue { + u32 pkts_coal; + u32 time_coal; + ++ /* page_pool */ ++ struct page_pool *page_pool; ++ struct xdp_rxq_info xdp_rxq; ++ + /* Virtual address of the RX buffer */ + void **buf_virt_addr; + +@@ -1823,23 +1828,21 @@ static int mvneta_rx_refill(struct mvnet + struct mvneta_rx_queue *rxq, + gfp_t gfp_mask) + { ++ enum dma_data_direction dma_dir; + dma_addr_t phys_addr; + struct page *page; + +- page = __dev_alloc_page(gfp_mask); ++ page = page_pool_alloc_pages(rxq->page_pool, ++ gfp_mask | __GFP_NOWARN); + if (!page) + return -ENOMEM; + +- /* map page for use */ +- phys_addr = dma_map_page(pp->dev->dev.parent, page, 0, PAGE_SIZE, +- DMA_FROM_DEVICE); +- if (unlikely(dma_mapping_error(pp->dev->dev.parent, phys_addr))) { +- __free_page(page); +- return -ENOMEM; +- } +- +- phys_addr += pp->rx_offset_correction; ++ phys_addr = page_pool_get_dma_addr(page) + pp->rx_offset_correction; ++ dma_dir = page_pool_get_dma_dir(rxq->page_pool); ++ dma_sync_single_for_device(pp->dev->dev.parent, phys_addr, ++ PAGE_SIZE, dma_dir); + mvneta_rx_desc_fill(rx_desc, phys_addr, page, rxq); ++ + return 0; + } + +@@ -1905,10 +1908,12 @@ static void mvneta_rxq_drop_pkts(struct + if (!data || !(rx_desc->buf_phys_addr)) + continue; + +- dma_unmap_page(pp->dev->dev.parent, rx_desc->buf_phys_addr, +- PAGE_SIZE, DMA_FROM_DEVICE); +- __free_page(data); ++ page_pool_put_page(rxq->page_pool, data, false); + } ++ if (xdp_rxq_info_is_reg(&rxq->xdp_rxq)) ++ xdp_rxq_info_unreg(&rxq->xdp_rxq); ++ page_pool_destroy(rxq->page_pool); ++ rxq->page_pool = NULL; + } + + static void +@@ -2045,8 +2050,7 @@ static int mvneta_rx_swbm(struct napi_st + skb_add_rx_frag(rxq->skb, frag_num, page, + frag_offset, frag_size, + PAGE_SIZE); +- dma_unmap_page(dev->dev.parent, phys_addr, +- PAGE_SIZE, DMA_FROM_DEVICE); ++ page_pool_release_page(rxq->page_pool, page); + rxq->left_size -= frag_size; + } + } else { +@@ -2076,9 +2080,7 @@ static int mvneta_rx_swbm(struct napi_st + frag_offset, frag_size, + PAGE_SIZE); + +- dma_unmap_page(dev->dev.parent, phys_addr, +- PAGE_SIZE, DMA_FROM_DEVICE); +- ++ page_pool_release_page(rxq->page_pool, page); + rxq->left_size -= frag_size; + } + } /* Middle or Last descriptor */ +@@ -2845,11 +2847,54 @@ static int mvneta_poll(struct napi_struc + return rx_done; + } + ++static int mvneta_create_page_pool(struct mvneta_port *pp, ++ struct mvneta_rx_queue *rxq, int size) ++{ ++ struct page_pool_params pp_params = { ++ .order = 0, ++ .flags = PP_FLAG_DMA_MAP, ++ .pool_size = size, ++ .nid = cpu_to_node(0), ++ .dev = pp->dev->dev.parent, ++ .dma_dir = DMA_FROM_DEVICE, ++ }; ++ int err; ++ ++ rxq->page_pool = page_pool_create(&pp_params); ++ if (IS_ERR(rxq->page_pool)) { ++ err = PTR_ERR(rxq->page_pool); ++ rxq->page_pool = NULL; ++ return err; ++ } ++ ++ err = xdp_rxq_info_reg(&rxq->xdp_rxq, pp->dev, rxq->id); ++ if (err < 0) ++ goto err_free_pp; ++ ++ err = xdp_rxq_info_reg_mem_model(&rxq->xdp_rxq, MEM_TYPE_PAGE_POOL, ++ rxq->page_pool); ++ if (err) ++ goto err_unregister_rxq; ++ ++ return 0; ++ ++err_unregister_rxq: ++ xdp_rxq_info_unreg(&rxq->xdp_rxq); ++err_free_pp: ++ page_pool_destroy(rxq->page_pool); ++ rxq->page_pool = NULL; ++ return err; ++} ++ + /* Handle rxq fill: allocates rxq skbs; called when initializing a port */ + static int mvneta_rxq_fill(struct mvneta_port *pp, struct mvneta_rx_queue *rxq, + int num) + { +- int i; ++ int i, err; ++ ++ err = mvneta_create_page_pool(pp, rxq, num); ++ if (err < 0) ++ return err; + + for (i = 0; i < num; i++) { + memset(rxq->descs + i, 0, sizeof(struct mvneta_rx_desc)); -- cgit v1.2.3