From 8f50d8bb3f1c173492d1d224bce99486fd6ccd32 Mon Sep 17 00:00:00 2001 From: Vladimir Oltean Date: Sat, 17 Apr 2021 00:22:19 +0300 Subject: net: enetc: stop XDP NAPI processing when build_skb() fails When the code path below fails: enetc_clean_rx_ring_xdp // XDP_PASS -> enetc_build_skb -> enetc_map_rx_buff_to_skb -> build_skb enetc_clean_rx_ring_xdp will 'break', but that 'break' instruction isn't strong enough to actually break the NAPI poll loop, just the switch/case statement for XDP actions. So we increment rx_frm_cnt and go to the next frames minding our own business. Instead let's do what the skb NAPI poll function does, and break the loop now, waiting for the memory pressure to go away. Otherwise the next calls to build_skb() are likely to fail too. Signed-off-by: Vladimir Oltean Signed-off-by: David S. Miller --- drivers/net/ethernet/freescale/enetc/enetc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'drivers/net') diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c index c6f984473337..469170076efa 100644 --- a/drivers/net/ethernet/freescale/enetc/enetc.c +++ b/drivers/net/ethernet/freescale/enetc/enetc.c @@ -1275,8 +1275,7 @@ static int enetc_clean_rx_ring_xdp(struct enetc_bdr *rx_ring, &i, &cleaned_cnt, ENETC_RXB_DMA_SIZE_XDP); if (unlikely(!skb)) - /* Exit the switch/case, not the loop */ - break; + goto out; napi_gro_receive(napi, skb); break; @@ -1338,6 +1337,7 @@ static int enetc_clean_rx_ring_xdp(struct enetc_bdr *rx_ring, rx_frm_cnt++; } +out: rx_ring->next_to_clean = i; rx_ring->stats.packets += rx_frm_cnt; -- cgit