Merge branch 'tsnep-xdp-fixes'

Gerhard Engleder says:

====================
tsnep: XDP fixes

Found two driver specific problems during XDP and XSK testing.
====================

Link: https://lore.kernel.org/r/20240123200918.61219-1-gerhard@engleder-embedded.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/ethernet/engleder/tsnep_main.c

@@ -1485,7 +1485,7 @@ static int tsnep_rx_poll(struct tsnep_rx *rx, struct napi_struct *napi,
 
 			xdp_prepare_buff(&xdp, page_address(entry->page),
 					 XDP_PACKET_HEADROOM + TSNEP_RX_INLINE_METADATA_SIZE,
-					 length, false);
+					 length - ETH_FCS_LEN, false);
 
 			consume = tsnep_xdp_run_prog(rx, prog, &xdp,
 						     &xdp_status, tx_nq, tx);
@@ -1568,7 +1568,7 @@ static int tsnep_rx_poll_zc(struct tsnep_rx *rx, struct napi_struct *napi,
 		prefetch(entry->xdp->data);
 		length = __le32_to_cpu(entry->desc_wb->properties) &
 			 TSNEP_DESC_LENGTH_MASK;
-		xsk_buff_set_size(entry->xdp, length);
+		xsk_buff_set_size(entry->xdp, length - ETH_FCS_LEN);
 		xsk_buff_dma_sync_for_cpu(entry->xdp, rx->xsk_pool);
 
 		/* RX metadata with timestamps is in front of actual data,
@@ -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)