tsnep: Fix XDP_RING_NEED_WAKEUP for empty fill ring

The fill ring of the XDP socket may contain not enough buffers to
completey fill the RX queue during socket creation. In this case the
flag XDP_RING_NEED_WAKEUP is not set as this flag is only set if the RX
queue is not completely filled during polling.

Set XDP_RING_NEED_WAKEUP flag also if RX queue is not completely filled
during XDP socket creation.

Fixes: 3fc2333933fd ("tsnep: Add XDP socket zero-copy RX support")
Signed-off-by: Gerhard Engleder <gerhard@engleder-embedded.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/drivers/net/ethernet/engleder/tsnep_main.c b/drivers/net/ethernet/engleder/tsnep_main.c
index 456e0336f3f6640b4a0f1b298cf2310824f08a1e..9aeff2b37a61299587c22dc39b207204c3412543 100644 (file)
--- a/drivers/net/ethernet/engleder/tsnep_main.c
+++ b/drivers/net/ethernet/engleder/tsnep_main.c
@@ -1762,6 +1762,19 @@ static void tsnep_rx_reopen_xsk(struct tsnep_rx *rx)
                        allocated--;
                }
        }
+
+       /* set need wakeup flag immediately if ring is not filled completely,
+        * first polling would be too late as need wakeup signalisation would
+        * be delayed for an indefinite time
+        */
+       if (xsk_uses_need_wakeup(rx->xsk_pool)) {
+               int desc_available = tsnep_rx_desc_available(rx);
+
+               if (desc_available)
+                       xsk_set_rx_need_wakeup(rx->xsk_pool);
+               else
+                       xsk_clear_rx_need_wakeup(rx->xsk_pool);
+       }
 }
 
 static bool tsnep_pending(struct tsnep_queue *queue)