Commit 2ff7a7d3 authored by Wei Fang's avatar Wei Fang Committed by Paolo Abeni
Browse files

net: fec: transmit XDP frames in bulk 



Currently, the driver writes the ENET_TDAR register for every XDP frame
to trigger transmit start. Frequent MMIO writes consume more CPU cycles
and may reduce XDP TX performance, so transmit XDP frames in bulk.

Signed-off-by: default avatarWei Fang <wei.fang@nxp.com>
Reviewed-by: default avatarFrank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260205085742.2685134-9-wei.fang@nxp.com


Signed-off-by: default avatarPaolo Abeni <pabeni@redhat.com>
parent 8a3344bb

drivers/net/ethernet/freescale/fec_main.c

+9 −3
Original line number Diff line number Diff line
@@ -2006,6 +2006,8 @@ static int fec_enet_rx_queue_xdp(struct fec_enet_private *fep, int queue, 
				rxq->stats[RX_XDP_TX_ERRORS]++;

				fec_xdp_drop(rxq, &xdp, sync);

				trace_xdp_exception(ndev, prog, XDP_TX);

			} else {

				xdp_res |= FEC_ENET_XDP_TX;

			}

			break;

		default:
@@ -2056,6 +2058,10 @@ static int fec_enet_rx_queue_xdp(struct fec_enet_private *fep, int queue, 
	if (xdp_res & FEC_ENET_XDP_REDIR)

		xdp_do_flush();



	if (xdp_res & FEC_ENET_XDP_TX)

		/* Trigger transmission start */

		fec_txq_trigger_xmit(fep, fep->tx_queue[tx_qid]);



	return pkt_received;

}
@@ -4037,9 +4043,6 @@ static int fec_enet_txq_xmit_frame(struct fec_enet_private *fep, 


	txq->bd.cur = bdp;



	/* Trigger transmission start */

	fec_txq_trigger_xmit(fep, txq);



	return 0;

}
@@ -4089,6 +4092,9 @@ static int fec_enet_xdp_xmit(struct net_device *dev, 
		sent_frames++;

	}



	if (sent_frames)

		fec_txq_trigger_xmit(fep, txq);



	__netif_tx_unlock(nq);



	return sent_frames;