1 files changed, 24 insertions, 15 deletions

diff --git a/drivers/net/sfc/rx.c b/drivers/net/sfc/rx.c
index a6413309c577..f15d33225342 100644
--- a/drivers/net/sfc/rx.c
+++ b/drivers/net/sfc/rx.c
@@ -86,14 +86,21 @@ static unsigned int rx_refill_limit = 95;
  */
 #define EFX_RXD_HEAD_ROOM 2
 
-/* Macros for zero-order pages (potentially) containing multiple RX buffers */
-#define RX_DATA_OFFSET(_data)                           \
-        (((unsigned long) (_data)) & (PAGE_SIZE-1))
-#define RX_BUF_OFFSET(_rx_buf)                          \
-        RX_DATA_OFFSET((_rx_buf)->data)
-
-#define RX_PAGE_SIZE(_efx)                              \
-        (PAGE_SIZE * (1u << (_efx)->rx_buffer_order))
+static inline unsigned int efx_page_offset(void *p)
+{
+        return (__force unsigned int)p & (PAGE_SIZE - 1);
+}
+static inline unsigned int efx_rx_buf_offset(struct efx_rx_buffer *buf)
+{
+        /* Offset is always within one page, so we don't need to consider
+         * the page order.
+         */
+        return efx_page_offset(buf->data);
+}
+static inline unsigned int efx_rx_buf_size(struct efx_nic *efx)
+{
+        return PAGE_SIZE << efx->rx_buffer_order;
+}
 
 
 /**************************************************************************
@@ -269,7 +276,7 @@ static inline int efx_init_rx_buffer_page(struct efx_rx_queue *rx_queue,
                         return -ENOMEM;
 
                 dma_addr = pci_map_page(efx->pci_dev, rx_buf->page,
-                                        0, RX_PAGE_SIZE(efx),
+                                        0, efx_rx_buf_size(efx),
                                         PCI_DMA_FROMDEVICE);
 
                 if (unlikely(pci_dma_mapping_error(dma_addr))) {
@@ -284,7 +291,7 @@ static inline int efx_init_rx_buffer_page(struct efx_rx_queue *rx_queue,
                                       EFX_PAGE_IP_ALIGN);
         }
 
-        offset = RX_DATA_OFFSET(rx_queue->buf_data);
+        offset = efx_page_offset(rx_queue->buf_data);
         rx_buf->len = bytes;
         rx_buf->dma_addr = rx_queue->buf_dma_addr + offset;
         rx_buf->data = rx_queue->buf_data;
@@ -295,7 +302,7 @@ static inline int efx_init_rx_buffer_page(struct efx_rx_queue *rx_queue,
                 rx_queue->buf_data += ((bytes + 0x1ff) & ~0x1ff);
                 offset += ((bytes + 0x1ff) & ~0x1ff);
 
-                space = RX_PAGE_SIZE(efx) - offset;
+                space = efx_rx_buf_size(efx) - offset;
                 if (space >= bytes) {
                         /* Refs dropped on kernel releasing each skb */
                         get_page(rx_queue->buf_page);
@@ -344,7 +351,8 @@ static inline void efx_unmap_rx_buffer(struct efx_nic *efx,
                 EFX_BUG_ON_PARANOID(rx_buf->skb);
                 if (rx_buf->unmap_addr) {
                         pci_unmap_page(efx->pci_dev, rx_buf->unmap_addr,
-                                       RX_PAGE_SIZE(efx), PCI_DMA_FROMDEVICE);
+                                       efx_rx_buf_size(efx),
+                                       PCI_DMA_FROMDEVICE);
                         rx_buf->unmap_addr = 0;
                 }
         } else if (likely(rx_buf->skb)) {
@@ -553,7 +561,7 @@ static inline void efx_rx_packet_lro(struct efx_channel *channel,
                 struct skb_frag_struct frags;
 
                 frags.page = rx_buf->page;
-                frags.page_offset = RX_BUF_OFFSET(rx_buf);
+                frags.page_offset = efx_rx_buf_offset(rx_buf);
                 frags.size = rx_buf->len;
 
                 lro_receive_frags(lro_mgr, &frags, rx_buf->len,
@@ -598,7 +606,7 @@ static inline struct sk_buff *efx_rx_mk_skb(struct efx_rx_buffer *rx_buf,
         if (unlikely(rx_buf->len > hdr_len)) {
                 struct skb_frag_struct *frag = skb_shinfo(skb)->frags;
                 frag->page = rx_buf->page;
-                frag->page_offset = RX_BUF_OFFSET(rx_buf) + hdr_len;
+                frag->page_offset = efx_rx_buf_offset(rx_buf) + hdr_len;
                 frag->size = skb->len - hdr_len;
                 skb_shinfo(skb)->nr_frags = 1;
                 skb->data_len = frag->size;
@@ -852,7 +860,8 @@ void efx_fini_rx_queue(struct efx_rx_queue *rx_queue)
         /* For a page that is part-way through splitting into RX buffers */
         if (rx_queue->buf_page != NULL) {
                 pci_unmap_page(rx_queue->efx->pci_dev, rx_queue->buf_dma_addr,
-                               RX_PAGE_SIZE(rx_queue->efx), PCI_DMA_FROMDEVICE);
+                               efx_rx_buf_size(rx_queue->efx),
+                               PCI_DMA_FROMDEVICE);
                 __free_pages(rx_queue->buf_page,
                              rx_queue->efx->rx_buffer_order);
                 rx_queue->buf_page = NULL;