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drivers/net/wan/hdlc_fr: Add needed_headroom for PVC devices

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PVC devices are virtual devices in this driver stacked on top of the
actual HDLC device. They are the devices normal users would use.
PVC devices have two types: normal PVC devices and Ethernet-emulating
PVC devices.

When transmitting data with PVC devices, the ndo_start_xmit function
will prepend a header of 4 or 10 bytes. Currently this driver requests
this headroom to be reserved for normal PVC devices by setting their
hard_header_len to 10. However, this does not work when these devices
are used with AF_PACKET/RAW sockets. Also, this driver does not request
this headroom for Ethernet-emulating PVC devices (but deals with this
problem by reallocating the skb when needed, which is not optimal).

This patch replaces hard_header_len with needed_headroom, and set
needed_headroom for Ethernet-emulating PVC devices, too. This makes
the driver to request headroom for all PVC devices in all cases.

Cc: Krzysztof Halasa <khc@pm.waw.pl>
Cc: Martin Schiller <ms@dev.tdt.de>
Signed-off-by: Xie He <xie.he.0141@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Xie He 2020-09-02 17:06:58 -07:00 committed by Jakub Kicinski
parent c70672d8d3
commit 44a049c426
1 changed files with 2 additions and 1 deletions
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3
drivers/net/wan/hdlc_fr.c
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@ -1041,7 +1041,7 @@ static void pvc_setup(struct net_device *dev)
{
dev->type = ARPHRD_DLCI;
dev->flags = IFF_POINTOPOINT;
dev->hard_header_len = 10;
dev->hard_header_len = 0;
dev->addr_len = 2;
netif_keep_dst(dev);
}
@ -1093,6 +1093,7 @@ static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type)
dev->mtu = HDLC_MAX_MTU;
dev->min_mtu = 68;
dev->max_mtu = HDLC_MAX_MTU;
dev->needed_headroom = 10;
dev->priv_flags |= IFF_NO_QUEUE;
dev->ml_priv = pvc;