diff options
| author | Xie He <xie.he.0141@gmail.com> | 2020-09-02 17:06:58 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-10-07 08:00:06 +0200 |
| commit | 342ee084a1bbf62ace68f03a59742da38e2b009f (patch) | |
| tree | f1d2038ee49a13ae5442285bfde359a13eee52cf | |
| parent | 80f0f9b5803e1394c5bbcb7259359b3ab9d6b335 (diff) | |
drivers/net/wan/hdlc_fr: Add needed_headroom for PVC devices
[ Upstream commit 44a049c42681de71c783d75cd6e56b4e339488b0 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/net/wan/hdlc_fr.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/net/wan/hdlc_fr.c b/drivers/net/wan/hdlc_fr.c index 038236a9c60e..67f89917277c 100644 --- a/drivers/net/wan/hdlc_fr.c +++ b/drivers/net/wan/hdlc_fr.c @@ -1044,7 +1044,7 @@ 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); } @@ -1096,6 +1096,7 @@ 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; |