[PATCH 5.10 463/717] i40e, xsk: clear the status bits for the next_to_use descriptor

Greg Kroah-Hartman
2020-12-28T14:23:42Z

From: Björn Töpel <bjorn.topel@intel.com>

[ Upstream commit 64050b5b8706d304ba647591b06e1eddc55e8bd9 ]

On the Rx side, the next_to_use index points to the next item in the
HW ring to be refilled/allocated, and next_to_clean points to the next
item to potentially be processed.

When the HW Rx ring is fully refilled, i.e. no packets has been
processed, the next_to_use will be next_to_clean - 1. When the ring is
fully processed next_to_clean will be equal to next_to_use. The latter
case is where a bug is triggered.

If the next_to_use bits are not cleared, and the "fully processed"
state is entered, a stale descriptor can be processed.

The skb-path correctly clear the status bit for the next_to_use
descriptor, but the AF_XDP zero-copy path did not do that.

This change adds the status bits clearing of the next_to_use
descriptor.

Fixes: 3b4f0b66c2b3 ("i40e, xsk: Migrate to new MEM_TYPE_XSK_BUFF_POOL")
Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/intel/i40e/i40e_xsk.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_xsk.c b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
index 567fd67e900ef..e402c62eb3137 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_xsk.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
@@ -219,8 +219,11 @@ bool i40e_alloc_rx_buffers_zc(struct i40e_ring *rx_ring, u16 count)
} while (count);

no_buffers:
- if (rx_ring->next_to_use != ntu)
+ if (rx_ring->next_to_use != ntu) {
+ /* clear the status bits for the next_to_use descriptor */
+ rx_desc->wb.qword1.status_error_len = 0;
i40e_release_rx_desc(rx_ring, ntu);
+ }

return ok;
}
--
2.27.0