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@xxxxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/engleder/tsnep_main.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/net/ethernet/engleder/tsnep_main.c b/drivers/net/ethernet/engleder/tsnep_main.c
index d380a407e175..ae0b8b37b9bf 100644
--- a/drivers/net/ethernet/engleder/tsnep_main.c
+++ b/drivers/net/ethernet/engleder/tsnep_main.c
@@ -1764,6 +1764,19 @@ 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)
--
2.39.2
