From bb837a37db8d9ce4c69c7c328e825ff35344df4f Mon Sep 17 00:00:00 2001 From: Gerhard Engleder Date: Tue, 27 Sep 2022 21:58:42 +0200 Subject: [PATCH] tsnep: Use page pool for RX Use page pool for RX buffer handling. Makes RX path more efficient and is required prework for future XDP support. Signed-off-by: Gerhard Engleder Signed-off-by: David S. Miller --- drivers/net/ethernet/engleder/Kconfig | 1 + drivers/net/ethernet/engleder/tsnep.h | 5 +- drivers/net/ethernet/engleder/tsnep_main.c | 162 +++++++++++++++++------------ 3 files changed, 100 insertions(+), 68 deletions(-) diff --git a/drivers/net/ethernet/engleder/Kconfig b/drivers/net/ethernet/engleder/Kconfig index f4e2b11..3df6bf47 100644 --- a/drivers/net/ethernet/engleder/Kconfig +++ b/drivers/net/ethernet/engleder/Kconfig @@ -21,6 +21,7 @@ config TSNEP depends on HAS_IOMEM && HAS_DMA depends on PTP_1588_CLOCK_OPTIONAL select PHYLIB + select PAGE_POOL help Support for the Engleder TSN endpoint Ethernet MAC IP Core. diff --git a/drivers/net/ethernet/engleder/tsnep.h b/drivers/net/ethernet/engleder/tsnep.h index 2ca34ae..09a723b8 100644 --- a/drivers/net/ethernet/engleder/tsnep.h +++ b/drivers/net/ethernet/engleder/tsnep.h @@ -96,9 +96,9 @@ struct tsnep_rx_entry { u32 properties; - struct sk_buff *skb; + struct page *page; size_t len; - DEFINE_DMA_UNMAP_ADDR(dma); + dma_addr_t dma; }; struct tsnep_rx { @@ -113,6 +113,7 @@ struct tsnep_rx { int read; u32 owner_counter; int increment_owner_counter; + struct page_pool *page_pool; u32 packets; u32 bytes; diff --git a/drivers/net/ethernet/engleder/tsnep_main.c b/drivers/net/ethernet/engleder/tsnep_main.c index 5ed4f69..48fb391 100644 --- a/drivers/net/ethernet/engleder/tsnep_main.c +++ b/drivers/net/ethernet/engleder/tsnep_main.c @@ -27,10 +27,10 @@ #include #include -#define RX_SKB_LENGTH (round_up(TSNEP_RX_INLINE_METADATA_SIZE + ETH_HLEN + \ - TSNEP_MAX_FRAME_SIZE + ETH_FCS_LEN, 4)) -#define RX_SKB_RESERVE ((16 - TSNEP_RX_INLINE_METADATA_SIZE) + NET_IP_ALIGN) -#define RX_SKB_ALLOC_LENGTH (RX_SKB_RESERVE + RX_SKB_LENGTH) +#define TSNEP_SKB_PAD (NET_SKB_PAD + NET_IP_ALIGN) +#define TSNEP_HEADROOM ALIGN(TSNEP_SKB_PAD, 4) +#define TSNEP_MAX_RX_BUF_SIZE (PAGE_SIZE - TSNEP_HEADROOM - \ + SKB_DATA_ALIGN(sizeof(struct skb_shared_info))) #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT #define DMA_ADDR_HIGH(dma_addr) ((u32)(((dma_addr) >> 32) & 0xFFFFFFFF)) @@ -587,14 +587,15 @@ static void tsnep_rx_ring_cleanup(struct tsnep_rx *rx) for (i = 0; i < TSNEP_RING_SIZE; i++) { entry = &rx->entry[i]; - if (dma_unmap_addr(entry, dma)) - dma_unmap_single(dmadev, dma_unmap_addr(entry, dma), - dma_unmap_len(entry, len), - DMA_FROM_DEVICE); - if (entry->skb) - dev_kfree_skb(entry->skb); + if (entry->page) + page_pool_put_full_page(rx->page_pool, entry->page, + false); + entry->page = NULL; } + if (rx->page_pool) + page_pool_destroy(rx->page_pool); + memset(rx->entry, 0, sizeof(rx->entry)); for (i = 0; i < TSNEP_RING_PAGE_COUNT; i++) { @@ -607,31 +608,19 @@ static void tsnep_rx_ring_cleanup(struct tsnep_rx *rx) } } -static int tsnep_rx_alloc_and_map_skb(struct tsnep_rx *rx, - struct tsnep_rx_entry *entry) +static int tsnep_rx_alloc_buffer(struct tsnep_rx *rx, + struct tsnep_rx_entry *entry) { - struct device *dmadev = rx->adapter->dmadev; - struct sk_buff *skb; - dma_addr_t dma; + struct page *page; - skb = __netdev_alloc_skb(rx->adapter->netdev, RX_SKB_ALLOC_LENGTH, - GFP_ATOMIC | GFP_DMA); - if (!skb) + page = page_pool_dev_alloc_pages(rx->page_pool); + if (unlikely(!page)) return -ENOMEM; - skb_reserve(skb, RX_SKB_RESERVE); - - dma = dma_map_single(dmadev, skb->data, RX_SKB_LENGTH, - DMA_FROM_DEVICE); - if (dma_mapping_error(dmadev, dma)) { - dev_kfree_skb(skb); - return -ENOMEM; - } - - entry->skb = skb; - entry->len = RX_SKB_LENGTH; - dma_unmap_addr_set(entry, dma, dma); - entry->desc->rx = __cpu_to_le64(dma); + entry->page = page; + entry->len = TSNEP_MAX_RX_BUF_SIZE; + entry->dma = page_pool_get_dma_addr(entry->page); + entry->desc->rx = __cpu_to_le64(entry->dma + TSNEP_SKB_PAD); return 0; } @@ -640,6 +629,7 @@ static int tsnep_rx_ring_init(struct tsnep_rx *rx) { struct device *dmadev = rx->adapter->dmadev; struct tsnep_rx_entry *entry; + struct page_pool_params pp_params = { 0 }; struct tsnep_rx_entry *next_entry; int i, j; int retval; @@ -661,12 +651,28 @@ static int tsnep_rx_ring_init(struct tsnep_rx *rx) entry->desc_dma = rx->page_dma[i] + TSNEP_DESC_SIZE * j; } } + + pp_params.flags = PP_FLAG_DMA_MAP | PP_FLAG_DMA_SYNC_DEV; + pp_params.order = 0; + pp_params.pool_size = TSNEP_RING_SIZE; + pp_params.nid = dev_to_node(dmadev); + pp_params.dev = dmadev; + pp_params.dma_dir = DMA_FROM_DEVICE; + pp_params.max_len = TSNEP_MAX_RX_BUF_SIZE; + pp_params.offset = TSNEP_SKB_PAD; + rx->page_pool = page_pool_create(&pp_params); + if (IS_ERR(rx->page_pool)) { + retval = PTR_ERR(rx->page_pool); + rx->page_pool = NULL; + goto failed; + } + for (i = 0; i < TSNEP_RING_SIZE; i++) { entry = &rx->entry[i]; next_entry = &rx->entry[(i + 1) % TSNEP_RING_SIZE]; entry->desc->next = __cpu_to_le64(next_entry->desc_dma); - retval = tsnep_rx_alloc_and_map_skb(rx, entry); + retval = tsnep_rx_alloc_buffer(rx, entry); if (retval) goto failed; } @@ -682,7 +688,7 @@ static void tsnep_rx_activate(struct tsnep_rx *rx, int index) { struct tsnep_rx_entry *entry = &rx->entry[index]; - /* RX_SKB_LENGTH is a multiple of 4 */ + /* TSNEP_MAX_RX_BUF_SIZE is a multiple of 4 */ entry->properties = entry->len & TSNEP_DESC_LENGTH_MASK; entry->properties |= TSNEP_DESC_INTERRUPT_FLAG; if (index == rx->increment_owner_counter) { @@ -705,19 +711,52 @@ static void tsnep_rx_activate(struct tsnep_rx *rx, int index) entry->desc->properties = __cpu_to_le32(entry->properties); } +static struct sk_buff *tsnep_build_skb(struct tsnep_rx *rx, struct page *page, + int length) +{ + struct sk_buff *skb; + + skb = napi_build_skb(page_address(page), PAGE_SIZE); + if (unlikely(!skb)) + return NULL; + + /* update pointers within the skb to store the data */ + skb_reserve(skb, TSNEP_SKB_PAD + TSNEP_RX_INLINE_METADATA_SIZE); + __skb_put(skb, length - TSNEP_RX_INLINE_METADATA_SIZE - ETH_FCS_LEN); + + if (rx->adapter->hwtstamp_config.rx_filter == HWTSTAMP_FILTER_ALL) { + struct skb_shared_hwtstamps *hwtstamps = skb_hwtstamps(skb); + struct tsnep_rx_inline *rx_inline = + (struct tsnep_rx_inline *)(page_address(page) + + TSNEP_SKB_PAD); + + skb_shinfo(skb)->tx_flags |= + SKBTX_HW_TSTAMP_NETDEV; + memset(hwtstamps, 0, sizeof(*hwtstamps)); + hwtstamps->netdev_data = rx_inline; + } + + skb_record_rx_queue(skb, rx->queue_index); + skb->protocol = eth_type_trans(skb, rx->adapter->netdev); + + return skb; +} + static int tsnep_rx_poll(struct tsnep_rx *rx, struct napi_struct *napi, int budget) { struct device *dmadev = rx->adapter->dmadev; int done = 0; + enum dma_data_direction dma_dir; struct tsnep_rx_entry *entry; + struct page *page; struct sk_buff *skb; - size_t len; - dma_addr_t dma; int length; bool enable = false; int retval; + dma_dir = page_pool_get_dma_dir(rx->page_pool); + while (likely(done < budget)) { entry = &rx->entry[rx->read]; if ((__le32_to_cpu(entry->desc_wb->properties) & @@ -730,43 +769,34 @@ static int tsnep_rx_poll(struct tsnep_rx *rx, struct napi_struct *napi, */ dma_rmb(); - skb = entry->skb; - len = dma_unmap_len(entry, len); - dma = dma_unmap_addr(entry, dma); + prefetch(page_address(entry->page) + TSNEP_SKB_PAD); + length = __le32_to_cpu(entry->desc_wb->properties) & + TSNEP_DESC_LENGTH_MASK; + dma_sync_single_range_for_cpu(dmadev, entry->dma, TSNEP_SKB_PAD, + length, dma_dir); + page = entry->page; /* forward skb only if allocation is successful, otherwise - * skb is reused and frame dropped + * page is reused and frame dropped */ - retval = tsnep_rx_alloc_and_map_skb(rx, entry); + retval = tsnep_rx_alloc_buffer(rx, entry); if (!retval) { - dma_unmap_single(dmadev, dma, len, DMA_FROM_DEVICE); - - length = __le32_to_cpu(entry->desc_wb->properties) & - TSNEP_DESC_LENGTH_MASK; - skb_put(skb, length - ETH_FCS_LEN); - if (rx->adapter->hwtstamp_config.rx_filter == - HWTSTAMP_FILTER_ALL) { - struct skb_shared_hwtstamps *hwtstamps = - skb_hwtstamps(skb); - struct tsnep_rx_inline *rx_inline = - (struct tsnep_rx_inline *)skb->data; - - skb_shinfo(skb)->tx_flags |= - SKBTX_HW_TSTAMP_NETDEV; - memset(hwtstamps, 0, sizeof(*hwtstamps)); - hwtstamps->netdev_data = rx_inline; - } - skb_pull(skb, TSNEP_RX_INLINE_METADATA_SIZE); - skb_record_rx_queue(skb, rx->queue_index); - skb->protocol = eth_type_trans(skb, - rx->adapter->netdev); + skb = tsnep_build_skb(rx, page, length); + if (skb) { + page_pool_release_page(rx->page_pool, page); + + rx->packets++; + rx->bytes += length - + TSNEP_RX_INLINE_METADATA_SIZE; + if (skb->pkt_type == PACKET_MULTICAST) + rx->multicast++; - rx->packets++; - rx->bytes += length - TSNEP_RX_INLINE_METADATA_SIZE; - if (skb->pkt_type == PACKET_MULTICAST) - rx->multicast++; + napi_gro_receive(napi, skb); + } else { + page_pool_recycle_direct(rx->page_pool, page); - napi_gro_receive(napi, skb); + rx->dropped++; + } done++; } else { rx->dropped++; -- 2.7.4