[PATCH net v2 2/9] gve: fix XSK buffer leak when rings are stopped

[Joshua Washington]

GVE does not free XSK buffers when resetting ring state as a part of
stopping queues. This causes all XSK buffers which are posted to the
NIC to be leaked.

Free XSK buffers attached to an allocated buf_state when stopping rings.

Fixes: c1fffc5d66a7 ("gve: implement DQO RX datapath and control path for AF_XDP zero-copy")
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Tim Hostetler <thostet@xxxxxxxxxx>
Reviewed-by: Jordan Rhee <jordanrhee@xxxxxxxxxx>
Signed-off-by: Joshua Washington <joshwash@xxxxxxxxxx>
---
 drivers/net/ethernet/google/gve/gve_rx_dqo.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/google/gve/gve_rx_dqo.c b/drivers/net/ethernet/google/gve/gve_rx_dqo.c
index c3f4a76b0fac..3a88b7e98b16 100644
--- a/drivers/net/ethernet/google/gve/gve_rx_dqo.c
+++ b/drivers/net/ethernet/google/gve/gve_rx_dqo.c
@@ -113,6 +113,12 @@ static void gve_rx_reset_ring_dqo(struct gve_priv *priv, int idx)
 				gve_free_to_page_pool(rx, bs, false);
 			else
 				gve_free_qpl_page_dqo(bs);
+
+			if (gve_buf_state_is_allocated(rx, bs) &&
+			    bs->xsk_buff) {
+				xsk_buff_free(bs->xsk_buff);
+				bs->xsk_buff = NULL;
+			}
 		}
 	}
 
-- 
2.55.0.1082.g2b9226bbc0-goog