netdev - [PATCH intel-net v2 4/6] igb: add correct exception tracing for XDP

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Date:   Mon, 10 May 2021 11:38:52 +0200
From:   Magnus Karlsson <magnus.karlsson@...il.com>
To:     magnus.karlsson@...el.com, intel-wired-lan@...ts.osuosl.org,
        anthony.l.nguyen@...el.com, maciej.fijalkowski@...el.com
Cc:     netdev@...r.kernel.org, brouer@...hat.com
Subject: [PATCH intel-net v2 4/6] igb: add correct exception tracing for XDP

From: Magnus Karlsson <magnus.karlsson@...el.com>

Add missing exception tracing to XDP when a number of different
errors can occur. The support was only partial. Several errors
where not logged which would confuse the user quite a lot not
knowing where and why the packets disappeared.

Fixes: 9cbc948b5a20 ("igb: add XDP support")
Reported-by: Jesper Dangaard Brouer <brouer@...hat.com>
Signed-off-by: Magnus Karlsson <magnus.karlsson@...el.com>
---
 drivers/net/ethernet/intel/igb/igb_main.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 038a9fd1af44..004a5b15fadb 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -8401,18 +8401,20 @@ static struct sk_buff *igb_run_xdp(struct igb_adapter *adapter,
 		break;
 	case XDP_TX:
 		result = igb_xdp_xmit_back(adapter, xdp);
+		if (result == IGB_XDP_CONSUMED)
+			goto out_failure;
 		break;
 	case XDP_REDIRECT:
 		err = xdp_do_redirect(adapter->netdev, xdp, xdp_prog);
-		if (!err)
-			result = IGB_XDP_REDIR;
-		else
-			result = IGB_XDP_CONSUMED;
+		if (err)
+			goto out_failure;
+		result = IGB_XDP_REDIR;
 		break;
 	default:
 		bpf_warn_invalid_xdp_action(act);
 		fallthrough;
 	case XDP_ABORTED:
+out_failure:
 		trace_xdp_exception(rx_ring->netdev, xdp_prog, act);
 		fallthrough;
 	case XDP_DROP:
-- 
2.29.0