* [PATCH net-next v2] net: hdlc_x25: Remove unnecessary skb_reset_network_header calls
@ 2020-12-09 1:40 Xie He
2020-12-10 3:23 ` David Miller
0 siblings, 1 reply; 2+ messages in thread
From: Xie He @ 2020-12-09 1:40 UTC (permalink / raw)
To: David S. Miller, Jakub Kicinski, linux-x25, netdev, linux-kernel,
Martin Schiller
Cc: Xie He
1. In x25_xmit, skb_reset_network_header is not necessary before we call
lapb_data_request. The lapb module doesn't need skb->network_header.
So there is no need to set skb->network_header before calling
lapb_data_request.
2. In x25_data_indication (called by the lapb module after some data
have been received), skb_reset_network_header is not necessary before we
call netif_rx. After we call netif_rx, the code in net/core/dev.c will
call skb_reset_network_header before handing the skb to upper layers
(in __netif_receive_skb_core, called by __netif_receive_skb_one_core,
called by __netif_receive_skb, called by process_backlog). So we don't
need to call skb_reset_network_header by ourselves.
Cc: Martin Schiller <ms@dev.tdt.de>
Signed-off-by: Xie He <xie.he.0141@gmail.com>
---
drivers/net/wan/hdlc_x25.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/drivers/net/wan/hdlc_x25.c b/drivers/net/wan/hdlc_x25.c
index f52b9fed0593..bb164805804e 100644
--- a/drivers/net/wan/hdlc_x25.c
+++ b/drivers/net/wan/hdlc_x25.c
@@ -77,7 +77,6 @@ static int x25_data_indication(struct net_device *dev, struct sk_buff *skb)
}
skb_push(skb, 1);
- skb_reset_network_header(skb);
ptr = skb->data;
*ptr = X25_IFACE_DATA;
@@ -118,7 +117,6 @@ static netdev_tx_t x25_xmit(struct sk_buff *skb, struct net_device *dev)
switch (skb->data[0]) {
case X25_IFACE_DATA: /* Data to be transmitted */
skb_pull(skb, 1);
- skb_reset_network_header(skb);
if ((result = lapb_data_request(dev, skb)) != LAPB_OK)
dev_kfree_skb(skb);
return NETDEV_TX_OK;
--
2.27.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH net-next v2] net: hdlc_x25: Remove unnecessary skb_reset_network_header calls
2020-12-09 1:40 [PATCH net-next v2] net: hdlc_x25: Remove unnecessary skb_reset_network_header calls Xie He
@ 2020-12-10 3:23 ` David Miller
0 siblings, 0 replies; 2+ messages in thread
From: David Miller @ 2020-12-10 3:23 UTC (permalink / raw)
To: xie.he.0141; +Cc: kuba, linux-x25, netdev, linux-kernel, ms
From: Xie He <xie.he.0141@gmail.com>
Date: Tue, 8 Dec 2020 17:40:13 -0800
> 1. In x25_xmit, skb_reset_network_header is not necessary before we call
> lapb_data_request. The lapb module doesn't need skb->network_header.
> So there is no need to set skb->network_header before calling
> lapb_data_request.
>
> 2. In x25_data_indication (called by the lapb module after some data
> have been received), skb_reset_network_header is not necessary before we
> call netif_rx. After we call netif_rx, the code in net/core/dev.c will
> call skb_reset_network_header before handing the skb to upper layers
> (in __netif_receive_skb_core, called by __netif_receive_skb_one_core,
> called by __netif_receive_skb, called by process_backlog). So we don't
> need to call skb_reset_network_header by ourselves.
>
> Cc: Martin Schiller <ms@dev.tdt.de>
> Signed-off-by: Xie He <xie.he.0141@gmail.com>
Applied, thanks.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2020-12-09 1:40 [PATCH net-next v2] net: hdlc_x25: Remove unnecessary skb_reset_network_header calls Xie He
2020-12-10 3:23 ` David Miller
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