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From:   Shenwei Wang <shenwei.wang@nxp.com>
To:     Wei Fang <wei.fang@nxp.com>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>
Cc:     Shenwei Wang <shenwei.wang@nxp.com>,
        Clark Wang <xiaoning.wang@nxp.com>,
        NXP Linux Team <linux-imx@nxp.com>,
        Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Jesper Dangaard Brouer <hawk@kernel.org>,
        John Fastabend <john.fastabend@gmail.com>,
        Alexander Lobakin <alexandr.lobakin@intel.com>,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        imx@lists.linux.dev
Subject: [PATCH v2 net 2/2] net: fec: restructuring the functions to avoid forward declarations
Date:   Tue,  2 May 2023 17:08:18 -0500
Message-Id: <20230502220818.691444-2-shenwei.wang@nxp.com>
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The patch reorganizes functions related to XDP frame transmission, moving
them above the fec_enet_run_xdp implementation. This eliminates the need
for forward declarations of these functions.

Fixes: 6d6b39f180b8 ("net: fec: add initial XDP support")
Signed-off-by: Shenwei Wang <shenwei.wang@nxp.com>
---
 drivers/net/ethernet/freescale/fec_main.c | 216 +++++++++++-----------
 1 file changed, 108 insertions(+), 108 deletions(-)

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 42ec6ca3bf03..14f9907f3ca2 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -1511,6 +1511,114 @@ static void fec_enet_update_cbd(struct fec_enet_priv_rx_q *rxq,
 	bdp->cbd_bufaddr = cpu_to_fec32(phys_addr);
 }
 
+static int
+fec_enet_xdp_get_tx_queue(struct fec_enet_private *fep, int index)
+{
+	if (unlikely(index < 0))
+		return 0;
+
+	return (index % fep->num_tx_queues);
+}
+
+static int fec_enet_txq_xmit_frame(struct fec_enet_private *fep,
+				   struct fec_enet_priv_tx_q *txq,
+				   struct xdp_frame *frame)
+{
+	unsigned int index, status, estatus;
+	struct bufdesc *bdp, *last_bdp;
+	dma_addr_t dma_addr;
+	int entries_free;
+
+	entries_free = fec_enet_get_free_txdesc_num(txq);
+	if (entries_free < MAX_SKB_FRAGS + 1) {
+		netdev_err(fep->netdev, "NOT enough BD for SG!\n");
+		xdp_return_frame(frame);
+		return NETDEV_TX_BUSY;
+	}
+
+	/* Fill in a Tx ring entry */
+	bdp = txq->bd.cur;
+	last_bdp = bdp;
+	status = fec16_to_cpu(bdp->cbd_sc);
+	status &= ~BD_ENET_TX_STATS;
+
+	index = fec_enet_get_bd_index(bdp, &txq->bd);
+
+	dma_addr = dma_map_single(&fep->pdev->dev, frame->data,
+				  frame->len, DMA_TO_DEVICE);
+	if (dma_mapping_error(&fep->pdev->dev, dma_addr))
+		return FEC_ENET_XDP_CONSUMED;
+
+	status |= (BD_ENET_TX_INTR | BD_ENET_TX_LAST);
+	if (fep->bufdesc_ex)
+		estatus = BD_ENET_TX_INT;
+
+	bdp->cbd_bufaddr = cpu_to_fec32(dma_addr);
+	bdp->cbd_datlen = cpu_to_fec16(frame->len);
+
+	if (fep->bufdesc_ex) {
+		struct bufdesc_ex *ebdp = (struct bufdesc_ex *)bdp;
+
+		if (fep->quirks & FEC_QUIRK_HAS_AVB)
+			estatus |= FEC_TX_BD_FTYPE(txq->bd.qid);
+
+		ebdp->cbd_bdu = 0;
+		ebdp->cbd_esc = cpu_to_fec32(estatus);
+	}
+
+	index = fec_enet_get_bd_index(last_bdp, &txq->bd);
+	txq->tx_skbuff[index] = NULL;
+
+	/* Send it on its way.  Tell FEC it's ready, interrupt when done,
+	 * it's the last BD of the frame, and to put the CRC on the end.
+	 */
+	status |= (BD_ENET_TX_READY | BD_ENET_TX_TC);
+	bdp->cbd_sc = cpu_to_fec16(status);
+
+	/* If this was the last BD in the ring, start at the beginning again. */
+	bdp = fec_enet_get_nextdesc(last_bdp, &txq->bd);
+
+	txq->bd.cur = bdp;
+
+	return 0;
+}
+
+static int fec_enet_xdp_xmit(struct net_device *dev,
+			     int num_frames,
+			     struct xdp_frame **frames,
+			     u32 flags)
+{
+	struct fec_enet_private *fep = netdev_priv(dev);
+	struct fec_enet_priv_tx_q *txq;
+	int cpu = smp_processor_id();
+	unsigned int sent_frames = 0;
+	struct netdev_queue *nq;
+	unsigned int queue;
+	int i;
+
+	queue = fec_enet_xdp_get_tx_queue(fep, cpu);
+	txq = fep->tx_queue[queue];
+	nq = netdev_get_tx_queue(fep->netdev, queue);
+
+	__netif_tx_lock(nq, cpu);
+
+	for (i = 0; i < num_frames; i++) {
+		if (fec_enet_txq_xmit_frame(fep, txq, frames[i]) != 0)
+			break;
+		sent_frames++;
+	}
+
+	/* Make sure the update to bdp and tx_skbuff are performed. */
+	wmb();
+
+	/* Trigger transmission start */
+	writel(0, txq->bd.reg_desc_active);
+
+	__netif_tx_unlock(nq);
+
+	return sent_frames;
+}
+
 static u32
 fec_enet_run_xdp(struct fec_enet_private *fep, struct bpf_prog *prog,
 		 struct xdp_buff *xdp, struct fec_enet_priv_rx_q *rxq, int index)
@@ -3777,114 +3885,6 @@ static int fec_enet_bpf(struct net_device *dev, struct netdev_bpf *bpf)
 	}
 }
 
-static int
-fec_enet_xdp_get_tx_queue(struct fec_enet_private *fep, int index)
-{
-	if (unlikely(index < 0))
-		return 0;
-
-	return (index % fep->num_tx_queues);
-}
-
-static int fec_enet_txq_xmit_frame(struct fec_enet_private *fep,
-				   struct fec_enet_priv_tx_q *txq,
-				   struct xdp_frame *frame)
-{
-	unsigned int index, status, estatus;
-	struct bufdesc *bdp, *last_bdp;
-	dma_addr_t dma_addr;
-	int entries_free;
-
-	entries_free = fec_enet_get_free_txdesc_num(txq);
-	if (entries_free < MAX_SKB_FRAGS + 1) {
-		netdev_err(fep->netdev, "NOT enough BD for SG!\n");
-		xdp_return_frame(frame);
-		return NETDEV_TX_BUSY;
-	}
-
-	/* Fill in a Tx ring entry */
-	bdp = txq->bd.cur;
-	last_bdp = bdp;
-	status = fec16_to_cpu(bdp->cbd_sc);
-	status &= ~BD_ENET_TX_STATS;
-
-	index = fec_enet_get_bd_index(bdp, &txq->bd);
-
-	dma_addr = dma_map_single(&fep->pdev->dev, frame->data,
-				  frame->len, DMA_TO_DEVICE);
-	if (dma_mapping_error(&fep->pdev->dev, dma_addr))
-		return FEC_ENET_XDP_CONSUMED;
-
-	status |= (BD_ENET_TX_INTR | BD_ENET_TX_LAST);
-	if (fep->bufdesc_ex)
-		estatus = BD_ENET_TX_INT;
-
-	bdp->cbd_bufaddr = cpu_to_fec32(dma_addr);
-	bdp->cbd_datlen = cpu_to_fec16(frame->len);
-
-	if (fep->bufdesc_ex) {
-		struct bufdesc_ex *ebdp = (struct bufdesc_ex *)bdp;
-
-		if (fep->quirks & FEC_QUIRK_HAS_AVB)
-			estatus |= FEC_TX_BD_FTYPE(txq->bd.qid);
-
-		ebdp->cbd_bdu = 0;
-		ebdp->cbd_esc = cpu_to_fec32(estatus);
-	}
-
-	index = fec_enet_get_bd_index(last_bdp, &txq->bd);
-	txq->tx_skbuff[index] = NULL;
-
-	/* Send it on its way.  Tell FEC it's ready, interrupt when done,
-	 * it's the last BD of the frame, and to put the CRC on the end.
-	 */
-	status |= (BD_ENET_TX_READY | BD_ENET_TX_TC);
-	bdp->cbd_sc = cpu_to_fec16(status);
-
-	/* If this was the last BD in the ring, start at the beginning again. */
-	bdp = fec_enet_get_nextdesc(last_bdp, &txq->bd);
-
-	txq->bd.cur = bdp;
-
-	return 0;
-}
-
-static int fec_enet_xdp_xmit(struct net_device *dev,
-			     int num_frames,
-			     struct xdp_frame **frames,
-			     u32 flags)
-{
-	struct fec_enet_private *fep = netdev_priv(dev);
-	struct fec_enet_priv_tx_q *txq;
-	int cpu = smp_processor_id();
-	unsigned int sent_frames = 0;
-	struct netdev_queue *nq;
-	unsigned int queue;
-	int i;
-
-	queue = fec_enet_xdp_get_tx_queue(fep, cpu);
-	txq = fep->tx_queue[queue];
-	nq = netdev_get_tx_queue(fep->netdev, queue);
-
-	__netif_tx_lock(nq, cpu);
-
-	for (i = 0; i < num_frames; i++) {
-		if (fec_enet_txq_xmit_frame(fep, txq, frames[i]) != 0)
-			break;
-		sent_frames++;
-	}
-
-	/* Make sure the update to bdp and tx_skbuff are performed. */
-	wmb();
-
-	/* Trigger transmission start */
-	writel(0, txq->bd.reg_desc_active);
-
-	__netif_tx_unlock(nq);
-
-	return sent_frames;
-}
-
 static const struct net_device_ops fec_netdev_ops = {
 	.ndo_open		= fec_enet_open,
 	.ndo_stop		= fec_enet_close,
-- 
2.34.1