net: fec: add fec_build_skb() to build a skb

Extract the helper fec_build_skb() from fec_enet_rx_queue(), so that the
code for building a skb is centralized in fec_build_skb(), which makes
the code of fec_enet_rx_queue() more concise and readable.

Signed-off-by: Wei Fang <wei.fang@nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260205085742.2685134-5-wei.fang@nxp.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Author: WeiFang-NXP

drivers/net/ethernet/freescale/fec_main.c

@@ -1782,6 +1782,59 @@ static int fec_rx_error_check(struct net_device *ndev, u16 status)
 	return 0;
 }
 
+static struct sk_buff *fec_build_skb(struct fec_enet_private *fep,
+				     struct fec_enet_priv_rx_q *rxq,
+				     struct bufdesc *bdp,
+				     struct page *page, u32 len)
+{
+	struct net_device *ndev = fep->netdev;
+	struct bufdesc_ex *ebdp;
+	struct sk_buff *skb;
+
+	skb = build_skb(page_address(page),
+			PAGE_SIZE << fep->pagepool_order);
+	if (unlikely(!skb)) {
+		page_pool_recycle_direct(rxq->page_pool, page);
+		ndev->stats.rx_dropped++;
+		if (net_ratelimit())
+			netdev_err(ndev, "build_skb failed\n");
+
+		return NULL;
+	}
+
+	skb_reserve(skb, FEC_ENET_XDP_HEADROOM + fep->rx_shift);
+	skb_put(skb, len);
+	skb_mark_for_recycle(skb);
+
+	/* Get offloads from the enhanced buffer descriptor */
+	if (fep->bufdesc_ex) {
+		ebdp = (struct bufdesc_ex *)bdp;
+
+		/* If this is a VLAN packet remove the VLAN Tag */
+		if (ebdp->cbd_esc & cpu_to_fec32(BD_ENET_RX_VLAN))
+			fec_enet_rx_vlan(ndev, skb);
+
+		/* Get receive timestamp from the skb */
+		if (fep->hwts_rx_en)
+			fec_enet_hwtstamp(fep, fec32_to_cpu(ebdp->ts),
+					  skb_hwtstamps(skb));
+
+		if (fep->csum_flags & FLAG_RX_CSUM_ENABLED) {
+			if (!(ebdp->cbd_esc &
+			      cpu_to_fec32(FLAG_RX_CSUM_ERROR)))
+				/* don't check it */
+				skb->ip_summed = CHECKSUM_UNNECESSARY;
+			else
+				skb_checksum_none_assert(skb);
+		}
+	}
+
+	skb->protocol = eth_type_trans(skb, ndev);
+	skb_record_rx_queue(skb, rxq->bd.qid);
+
+	return skb;
+}
+
 /* During a receive, the bd_rx.cur points to the current incoming buffer.
  * When we update through the ring, if the next incoming buffer has
  * not been given to the system, we just set the empty indicator,
@@ -1797,7 +1850,6 @@ fec_enet_rx_queue(struct net_device *ndev, u16 queue_id, int budget)
 	struct  sk_buff *skb;
 	ushort	pkt_len;
 	int	pkt_received = 0;
-	struct	bufdesc_ex *ebdp = NULL;
 	int	index = 0;
 	bool	need_swap = fep->quirks & FEC_QUIRK_SWAP_FRAME;
 	u32 data_start = FEC_ENET_XDP_HEADROOM + fep->rx_shift;
@@ -1867,59 +1919,21 @@ fec_enet_rx_queue(struct net_device *ndev, u16 queue_id, int budget)
 				goto rx_processing_done;
 		}
 
-		/* The packet length includes FCS, but we don't want to
-		 * include that when passing upstream as it messes up
-		 * bridging applications.
-		 */
-		skb = build_skb(page_address(page),
-				PAGE_SIZE << fep->pagepool_order);
-		if (unlikely(!skb)) {
-			page_pool_recycle_direct(rxq->page_pool, page);
-			ndev->stats.rx_dropped++;
-
-			netdev_err_once(ndev, "build_skb failed!\n");
-			goto rx_processing_done;
-		}
-
-		skb_reserve(skb, data_start);
-		skb_put(skb, pkt_len - sub_len);
-		skb_mark_for_recycle(skb);
-
 		if (unlikely(need_swap)) {
 			u8 *data;
 
 			data = page_address(page) + FEC_ENET_XDP_HEADROOM;
 			swap_buffer(data, pkt_len);
 		}
 
-		/* Extract the enhanced buffer descriptor */
-		ebdp = NULL;
-		if (fep->bufdesc_ex)
-			ebdp = (struct bufdesc_ex *)bdp;
-
-		/* If this is a VLAN packet remove the VLAN Tag */
-		if (fep->bufdesc_ex &&
-		    (ebdp->cbd_esc & cpu_to_fec32(BD_ENET_RX_VLAN)))
-			fec_enet_rx_vlan(ndev, skb);
-
-		skb->protocol = eth_type_trans(skb, ndev);
-
-		/* Get receive timestamp from the skb */
-		if (fep->hwts_rx_en && fep->bufdesc_ex)
-			fec_enet_hwtstamp(fep, fec32_to_cpu(ebdp->ts),
-					  skb_hwtstamps(skb));
-
-		if (fep->bufdesc_ex &&
-		    (fep->csum_flags & FLAG_RX_CSUM_ENABLED)) {
-			if (!(ebdp->cbd_esc & cpu_to_fec32(FLAG_RX_CSUM_ERROR))) {
-				/* don't check it */
-				skb->ip_summed = CHECKSUM_UNNECESSARY;
-			} else {
-				skb_checksum_none_assert(skb);
-			}
-		}
+		/* The packet length includes FCS, but we don't want to
+		 * include that when passing upstream as it messes up
+		 * bridging applications.
+		 */
+		skb = fec_build_skb(fep, rxq, bdp, page, pkt_len - sub_len);
+		if (!skb)
+			goto rx_processing_done;
 
-		skb_record_rx_queue(skb, queue_id);
 		napi_gro_receive(&fep->napi, skb);
 
 rx_processing_done: