cxgb3: map entire Rx page, feed map+offset to Rx ring.
DMA mapping can be expensive in the presence of iommus.
Reduce the Rx iommu activity by mapping an entire page, and provide the H/W
the mapped address + offset of the current page chunk.
Reserve bits at the end of the page to track mapping references, so the page
can be unmapped.
Signed-off-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/cxgb3/adapter.h b/drivers/net/cxgb3/adapter.h
index 2cf6c92..714df2b 100644
--- a/drivers/net/cxgb3/adapter.h
+++ b/drivers/net/cxgb3/adapter.h
@@ -85,6 +85,8 @@
struct page *page;
void *va;
unsigned int offset;
+ u64 *p_cnt;
+ DECLARE_PCI_UNMAP_ADDR(mapping);
};
struct rx_desc;
@@ -101,6 +103,7 @@
struct fl_pg_chunk pg_chunk;/* page chunk cache */
unsigned int use_pages; /* whether FL uses pages or sk_buffs */
unsigned int order; /* order of page allocations */
+ unsigned int alloc_size; /* size of allocated buffer */
struct rx_desc *desc; /* address of HW Rx descriptor ring */
struct rx_sw_desc *sdesc; /* address of SW Rx descriptor ring */
dma_addr_t phys_addr; /* physical address of HW ring start */