sfc: allocate more RX buffers per page

Allocating 2 buffers per page is insanely inefficient when MTU is 1500
and PAGE_SIZE is 64K (as it usually is on POWER).  Allocate as many as
we can fit, and choose the refill batch size at run-time so that we
still always use a whole page at once.

[bwh: Fix loop condition to allow for compound pages; rebase]
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h
index e22e75c8f635..9bd433a095c5 100644
--- a/drivers/net/ethernet/sfc/net_driver.h
+++ b/drivers/net/ethernet/sfc/net_driver.h
@@ -825,7 +825,9 @@ struct efx_nic {
         unsigned int rx_dma_len;
         unsigned int rx_buffer_order;
         unsigned int rx_buffer_truesize;
+        unsigned int rx_page_buf_step;
         unsigned int rx_bufs_per_page;
+        unsigned int rx_pages_per_batch;
         u8 rx_hash_key[40];
         u32 rx_indir_table[128];
         bool rx_scatter;