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Commit ed93a398 authored by Björn Töpel's avatar Björn Töpel Committed by Jeff Kirsher
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ixgbe: tweak page counting for XDP_REDIRECT 



The current page counting scheme assumes that the reference count
cannot decrease until the received frame is sent to the upper layers
of the networking stack. This assumption does not hold for the
XDP_REDIRECT action, since a page (pointed out by xdp_buff) can have
its reference count decreased via the xdp_do_redirect call.

To work around that, we now start off by a large page count and then
don't allow a refcount less than two.

Signed-off-by: default avatarBjörn Töpel <bjorn.topel@intel.com>
Tested-by: default avatarAndrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent 2eb34baf

drivers/net/ethernet/intel/ixgbe/ixgbe_main.c

+4 −3
Original line number Diff line number Diff line
@@ -1629,7 +1629,8 @@ static bool ixgbe_alloc_mapped_page(struct ixgbe_ring *rx_ring, 
	bi->dma = dma;

	bi->page = page;

	bi->page_offset = ixgbe_rx_offset(rx_ring);

	bi->pagecnt_bias = 1;

	page_ref_add(page, USHRT_MAX - 1);

	bi->pagecnt_bias = USHRT_MAX;

	rx_ring->rx_stats.alloc_rx_page++;



	return true;
@@ -2039,8 +2040,8 @@ static bool ixgbe_can_reuse_rx_page(struct ixgbe_rx_buffer *rx_buffer) 
	 * the pagecnt_bias and page count so that we fully restock the

	 * number of references the driver holds.

	 */

	if (unlikely(!pagecnt_bias)) {

		page_ref_add(page, USHRT_MAX);

	if (unlikely(pagecnt_bias == 1)) {

		page_ref_add(page, USHRT_MAX - 1);

		rx_buffer->pagecnt_bias = USHRT_MAX;

	}