netdev - [PATCH net-next] net: fec: add exception tracing for XDP

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Date: Tue, 22 Aug 2023 14:52:55 +0800
From: Wei Fang <wei.fang@....com>
To: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	ast@...nel.org,
	daniel@...earbox.net,
	hawk@...nel.org,
	john.fastabend@...il.com,
	shenwei.wang@....com,
	xiaoning.wang@....com,
	netdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	bpf@...r.kernel.org,
	linux-imx@....com
Subject: [PATCH net-next] net: fec: add exception tracing for XDP

As we already added the exception tracing for XDP_TX, I think it is
necessary to add the exception tracing for other XDP actions, such
as XDP_REDIRECT, XDP_ABORTED and unknown error actions.

Signed-off-by: Wei Fang <wei.fang@....com>
Suggested-by: Jakub Kicinski <kuba@...nel.org>
---
 drivers/net/ethernet/freescale/fec_main.c | 26 ++++++++++-------------
 1 file changed, 11 insertions(+), 15 deletions(-)

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index e23a55977183..8909899e9a31 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -1583,25 +1583,18 @@ fec_enet_run_xdp(struct fec_enet_private *fep, struct bpf_prog *prog,
 	case XDP_REDIRECT:
 		rxq->stats[RX_XDP_REDIRECT]++;
 		err = xdp_do_redirect(fep->netdev, xdp, prog);
-		if (!err) {
-			ret = FEC_ENET_XDP_REDIR;
-		} else {
-			ret = FEC_ENET_XDP_CONSUMED;
-			page = virt_to_head_page(xdp->data);
-			page_pool_put_page(rxq->page_pool, page, sync, true);
-		}
+		if (unlikely(err))
+			goto xdp_err;
+
+		ret = FEC_ENET_XDP_REDIR;
 		break;
 
 	case XDP_TX:
 		err = fec_enet_xdp_tx_xmit(fep, cpu, xdp, sync);
-		if (unlikely(err)) {
-			ret = FEC_ENET_XDP_CONSUMED;
-			page = virt_to_head_page(xdp->data);
-			page_pool_put_page(rxq->page_pool, page, sync, true);
-			trace_xdp_exception(fep->netdev, prog, act);
-		} else {
-			ret = FEC_ENET_XDP_TX;
-		}
+		if (unlikely(err))
+			goto xdp_err;
+
+		ret = FEC_ENET_XDP_TX;
 		break;
 
 	default:
@@ -1613,9 +1606,12 @@ fec_enet_run_xdp(struct fec_enet_private *fep, struct bpf_prog *prog,
 
 	case XDP_DROP:
 		rxq->stats[RX_XDP_DROP]++;
+xdp_err:
 		ret = FEC_ENET_XDP_CONSUMED;
 		page = virt_to_head_page(xdp->data);
 		page_pool_put_page(rxq->page_pool, page, sync, true);
+		if (act != XDP_DROP)
+			trace_xdp_exception(fep->netdev, prog, act);
 		break;
 	}
 
-- 
2.25.1