From 1b56cf49f5b0bab9ad4eab18f9b0aee1929afd89 Mon Sep 17 00:00:00 2001 From: Alexander Duyck Date: Tue, 17 Jan 2017 08:36:03 -0800 Subject: [PATCH] ixgbe: Update code to better handle incrementing page count Batch the page count updates instead of doing them one at a time. By doing this we can improve the overall performance as the atomic increment operations can be expensive due to the fact that on x86 they are locked operations which can cause stalls. By doing bulk updates we can consolidate the stall which should help to improve the overall receive performance. Signed-off-by: Alexander Duyck Tested-by: Andrew Bowers Acked-by: John Fastabend Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/ixgbe/ixgbe.h | 7 +++- drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 39 ++++++++++++------- 2 files changed, 31 insertions(+), 15 deletions(-) diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe.h b/drivers/net/ethernet/intel/ixgbe/ixgbe.h index 8167e77b924f..d765db6bd8b2 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe.h +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe.h @@ -195,7 +195,12 @@ struct ixgbe_rx_buffer { struct sk_buff *skb; dma_addr_t dma; struct page *page; - unsigned int page_offset; +#if (BITS_PER_LONG > 32) || (PAGE_SIZE >= 65536) + __u32 page_offset; +#else + __u16 page_offset; +#endif + __u16 pagecnt_bias; }; struct ixgbe_queue_stats { diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c index ddde6759f094..e4487109292a 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c @@ -1589,6 +1589,7 @@ static bool ixgbe_alloc_mapped_page(struct ixgbe_ring *rx_ring, bi->dma = dma; bi->page = page; bi->page_offset = 0; + bi->pagecnt_bias = 1; return true; } @@ -1943,13 +1944,15 @@ static bool ixgbe_can_reuse_rx_page(struct ixgbe_ring *rx_ring, unsigned int last_offset = ixgbe_rx_pg_size(rx_ring) - ixgbe_rx_bufsz(rx_ring); #endif + unsigned int pagecnt_bias = rx_buffer->pagecnt_bias--; + /* avoid re-using remote pages */ if (unlikely(ixgbe_page_is_reserved(page))) return false; #if (PAGE_SIZE < 8192) /* if we are only owner of page we can reuse it */ - if (unlikely(page_count(page) != 1)) + if (unlikely(page_count(page) != pagecnt_bias)) return false; /* flip page offset to other buffer */ @@ -1962,10 +1965,14 @@ static bool ixgbe_can_reuse_rx_page(struct ixgbe_ring *rx_ring, return false; #endif - /* Even if we own the page, we are not allowed to use atomic_set() - * This would break get_page_unless_zero() users. + /* If we have drained the page fragment pool we need to update + * the pagecnt_bias and page count so that we fully restock the + * number of references the driver holds. */ - page_ref_inc(page); + if (unlikely(pagecnt_bias == 1)) { + page_ref_add(page, USHRT_MAX); + rx_buffer->pagecnt_bias = USHRT_MAX; + } return true; } @@ -2009,7 +2016,6 @@ static bool ixgbe_add_rx_frag(struct ixgbe_ring *rx_ring, return true; /* this page cannot be reused so discard it */ - __free_pages(page, ixgbe_rx_pg_order(rx_ring)); return false; } @@ -2088,15 +2094,19 @@ static struct sk_buff *ixgbe_fetch_rx_buffer(struct ixgbe_ring *rx_ring, if (ixgbe_add_rx_frag(rx_ring, rx_buffer, size, skb)) { /* hand second half of page back to the ring */ ixgbe_reuse_rx_page(rx_ring, rx_buffer); - } else if (IXGBE_CB(skb)->dma == rx_buffer->dma) { - /* the page has been released from the ring */ - IXGBE_CB(skb)->page_released = true; } else { - /* we are not reusing the buffer so unmap it */ - dma_unmap_page_attrs(rx_ring->dev, rx_buffer->dma, - ixgbe_rx_pg_size(rx_ring), - DMA_FROM_DEVICE, - IXGBE_RX_DMA_ATTR); + if (IXGBE_CB(skb)->dma == rx_buffer->dma) { + /* the page has been released from the ring */ + IXGBE_CB(skb)->page_released = true; + } else { + /* we are not reusing the buffer so unmap it */ + dma_unmap_page_attrs(rx_ring->dev, rx_buffer->dma, + ixgbe_rx_pg_size(rx_ring), + DMA_FROM_DEVICE, + IXGBE_RX_DMA_ATTR); + } + __page_frag_cache_drain(page, + rx_buffer->pagecnt_bias); } /* clear contents of buffer_info */ @@ -4914,7 +4924,8 @@ static void ixgbe_clean_rx_ring(struct ixgbe_ring *rx_ring) ixgbe_rx_pg_size(rx_ring), DMA_FROM_DEVICE, IXGBE_RX_DMA_ATTR); - __free_pages(rx_buffer->page, ixgbe_rx_pg_order(rx_ring)); + __page_frag_cache_drain(rx_buffer->page, + rx_buffer->pagecnt_bias); rx_buffer->page = NULL; } -- GitLab