[PATCH net-next v4 1/5] net: hdlc_fr: Simpify fr_rx by using "goto rx_drop" to drop frames
From: Xie He <hidden>
Date: 2020-10-30 02:30:02
Also in:
lkml
Subsystem:
generic hdlc (wan) drivers, networking drivers, the rest · Maintainers:
Krzysztof Halasa, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
1. When the fr_rx function drops a received frame (because the protocol type is not supported, or because the PVC virtual device that corresponds to the DLCI number and the protocol type doesn't exist), the function frees the skb and returns. The code for freeing the skb and returning is repeated several times, this patch uses "goto rx_drop" to replace them so that the code looks cleaner. 2. Add code to increase the stats.rx_dropped count whenever we drop a frame. Increase the stats.rx_dropped count both after "goto rx_drop" and after "goto rx_error" because I think we should increase this value whenever an skb is dropped. Cc: Willem de Bruijn <willemdebruijn.kernel@gmail.com> Cc: Krzysztof Halasa <khc@pm.waw.pl> Signed-off-by: Xie He <redacted> --- drivers/net/wan/hdlc_fr.c | 16 +++++++--------- 1 file changed, 7 insertions(+), 9 deletions(-)
diff --git a/drivers/net/wan/hdlc_fr.c b/drivers/net/wan/hdlc_fr.c
index 409e5a7ad8e2..c774eff44534 100644
--- a/drivers/net/wan/hdlc_fr.c
+++ b/drivers/net/wan/hdlc_fr.c@@ -904,8 +904,7 @@ static int fr_rx(struct sk_buff *skb) netdev_info(frad, "No PVC for received frame's DLCI %d\n", dlci); #endif - dev_kfree_skb_any(skb); - return NET_RX_DROP; + goto rx_drop; } if (pvc->state.fecn != fh->fecn) {
@@ -963,14 +962,12 @@ static int fr_rx(struct sk_buff *skb) default: netdev_info(frad, "Unsupported protocol, OUI=%x PID=%x\n", oui, pid); - dev_kfree_skb_any(skb); - return NET_RX_DROP; + goto rx_drop; } } else { netdev_info(frad, "Unsupported protocol, NLPID=%x length=%i\n", data[3], skb->len); - dev_kfree_skb_any(skb); - return NET_RX_DROP; + goto rx_drop; } if (dev) {
@@ -982,12 +979,13 @@ static int fr_rx(struct sk_buff *skb) netif_rx(skb); return NET_RX_SUCCESS; } else { - dev_kfree_skb_any(skb); - return NET_RX_DROP; + goto rx_drop; } - rx_error: +rx_error: frad->stats.rx_errors++; /* Mark error */ +rx_drop: + frad->stats.rx_dropped++; dev_kfree_skb_any(skb); return NET_RX_DROP; }
--
2.27.0