diff options
Diffstat (limited to 'drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c')
| -rw-r--r-- | drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c | 30 |
1 files changed, 22 insertions, 8 deletions
diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c index fbd493efd14e..ae2402ddd9fb 100644 --- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c +++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c @@ -611,6 +611,7 @@ static bool ixgbevf_alloc_mapped_page(struct ixgbevf_ring *rx_ring, bi->dma = dma; bi->page = page; bi->page_offset = 0; + bi->pagecnt_bias = 1; return true; } @@ -747,6 +748,7 @@ static void ixgbevf_reuse_rx_page(struct ixgbevf_ring *rx_ring, new_buff->page = old_buff->page; new_buff->dma = old_buff->dma; new_buff->page_offset = old_buff->page_offset; + new_buff->pagecnt_bias = old_buff->pagecnt_bias; } static inline bool ixgbevf_page_is_reserved(struct page *page) @@ -758,13 +760,15 @@ static bool ixgbevf_can_reuse_rx_page(struct ixgbevf_rx_buffer *rx_buffer, struct page *page, const unsigned int truesize) { + unsigned int pagecnt_bias = rx_buffer->pagecnt_bias--; + /* avoid re-using remote pages */ if (unlikely(ixgbevf_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_ref_count(page) != pagecnt_bias)) return false; /* flip page offset to other buffer */ @@ -778,10 +782,15 @@ static bool ixgbevf_can_reuse_rx_page(struct ixgbevf_rx_buffer *rx_buffer, 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; } @@ -827,7 +836,6 @@ static bool ixgbevf_add_rx_frag(struct ixgbevf_ring *rx_ring, return true; /* this page cannot be reused so discard it */ - put_page(page); return false; } @@ -899,10 +907,13 @@ static struct sk_buff *ixgbevf_fetch_rx_buffer(struct ixgbevf_ring *rx_ring, /* hand second half of page back to the ring */ ixgbevf_reuse_rx_page(rx_ring, rx_buffer); } else { - /* we are not reusing the buffer so unmap it */ + /* We are not reusing the buffer so unmap it and free + * any references we are holding to it + */ dma_unmap_page_attrs(rx_ring->dev, rx_buffer->dma, PAGE_SIZE, DMA_FROM_DEVICE, IXGBEVF_RX_DMA_ATTR); + __page_frag_cache_drain(page, rx_buffer->pagecnt_bias); } /* clear contents of buffer_info */ @@ -2135,6 +2146,8 @@ static void ixgbevf_clean_rx_ring(struct ixgbevf_ring *rx_ring) struct ixgbevf_rx_buffer *rx_buffer; rx_buffer = &rx_ring->rx_buffer_info[i]; + if (!rx_buffer->page) + continue; /* Invalidate cache lines that may have been written to by * device so that we avoid corrupting memory. @@ -2152,8 +2165,9 @@ static void ixgbevf_clean_rx_ring(struct ixgbevf_ring *rx_ring) DMA_FROM_DEVICE, IXGBEVF_RX_DMA_ATTR); - if (rx_buffer->page) - __free_page(rx_buffer->page); + __page_frag_cache_drain(rx_buffer->page, + rx_buffer->pagecnt_bias); + rx_buffer->page = NULL; } |