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[vlan] Provide vlan_netdev_rx() and vlan_netdev_rx_err() 

The Hermon driver uses vlan_find() to identify the appropriate VLAN
device for packets that are received with the VLAN tag already
stripped out by the hardware.  Generalise this capability and expose
it for use by other network card drivers.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/92/head
Michael Brown 2019-04-27 20:12:01 +01:00
parent afee77d816
commit fe680c8228
4 changed files with 84 additions and 21 deletions
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16
src/drivers/infiniband/hermon.c
View File

@ -3207,22 +3207,16 @@ static void hermon_eth_complete_recv ( struct ib_device *ibdev __unused,
struct ib_address_vector *source,
struct io_buffer *iobuf, int rc ) {
struct net_device *netdev = ib_qp_get_ownerdata ( qp );
struct net_device *vlan;
unsigned int tag;
/* Find VLAN device, if applicable */
if ( source->vlan_present ) {
if ( ( vlan = vlan_find ( netdev, source->vlan ) ) != NULL ) {
netdev = vlan;
} else if ( rc == 0 ) {
rc = -ENODEV;
}
}
/* Identify VLAN tag, if applicable */
tag = ( source->vlan_present ? source->vlan : 0 );
/* Hand off to network layer */
if ( rc == 0 ) {
netdev_rx ( netdev, iobuf );
vlan_netdev_rx ( netdev, tag, iobuf );
} else {
netdev_rx_err ( netdev, iobuf, rc );
vlan_netdev_rx_err ( netdev, tag, iobuf, rc );
}
}

8
src/include/ipxe/vlan.h
View File

@ -10,6 +10,8 @@
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <ipxe/netdevice.h>
/** A VLAN header */
struct vlan_header {
/** Tag control information */
@ -59,12 +61,14 @@ struct vlan_header {
*/
#define VLAN_PRIORITY_IS_VALID( priority ) ( (priority) <= 7 )
extern struct net_device * vlan_find ( struct net_device *trunk,
unsigned int tag );
extern unsigned int vlan_tag ( struct net_device *netdev );
extern int vlan_can_be_trunk ( struct net_device *trunk );
extern int vlan_create ( struct net_device *trunk, unsigned int tag,
unsigned int priority );
extern int vlan_destroy ( struct net_device *netdev );
extern void vlan_netdev_rx ( struct net_device *netdev, unsigned int tag,
struct io_buffer *iobuf );
extern void vlan_netdev_rx_err ( struct net_device *netdev, unsigned int tag,
struct io_buffer *iobuf, int rc );
#endif /* _IPXE_VLAN_H */

34
src/net/netdevice.c
View File

@ -1126,15 +1126,35 @@ __weak unsigned int vlan_tag ( struct net_device *netdev __unused ) {
}
/**
* Identify VLAN device (when VLAN support is not present)
* Add VLAN tag-stripped packet to queue (when VLAN support is not present)
*
* @v trunk Trunk network device
* @v tag VLAN tag
* @ret netdev VLAN device, if any
* @v netdev Network device
* @v tag VLAN tag, or zero
* @v iobuf I/O buffer
*/
__weak struct net_device * vlan_find ( struct net_device *trunk __unused,
unsigned int tag __unused ) {
return NULL;
__weak void vlan_netdev_rx ( struct net_device *netdev, unsigned int tag,
struct io_buffer *iobuf ) {
if ( tag == 0 ) {
netdev_rx ( netdev, iobuf );
} else {
netdev_rx_err ( netdev, iobuf, -ENODEV );
}
}
/**
* Discard received VLAN tag-stripped packet (when VLAN support is not present)
*
* @v netdev Network device
* @v tag VLAN tag, or zero
* @v iobuf I/O buffer, or NULL
* @v rc Packet status code
*/
__weak void vlan_netdev_rx_err ( struct net_device *netdev,
unsigned int tag __unused,
struct io_buffer *iobuf, int rc ) {
netdev_rx_err ( netdev, iobuf, rc );
}
/** Networking stack process */

47
src/net/vlan.c
View File

@ -199,7 +199,8 @@ static void vlan_sync ( struct net_device *netdev ) {
* @v tag VLAN tag
* @ret netdev VLAN device, if any
*/
struct net_device * vlan_find ( struct net_device *trunk, unsigned int tag ) {
static struct net_device * vlan_find ( struct net_device *trunk,
unsigned int tag ) {
struct net_device *netdev;
struct vlan_device *vlan;
@ -506,3 +507,47 @@ struct net_driver vlan_driver __net_driver = {
.notify = vlan_notify,
.remove = vlan_remove,
};
/**
* Add VLAN tag-stripped packet to receive queue
*
* @v netdev Network device
* @v tag VLAN tag, or zero
* @v iobuf I/O buffer
*/
void vlan_netdev_rx ( struct net_device *netdev, unsigned int tag,
struct io_buffer *iobuf ) {
struct net_device *vlan;
/* Identify VLAN device, if applicable */
if ( tag ) {
if ( ( vlan = vlan_find ( netdev, tag ) ) == NULL ) {
netdev_rx_err ( netdev, iobuf, -ENODEV );
return;
}
netdev = vlan;
}
/* Hand off to network device */
netdev_rx ( netdev, iobuf );
}
/**
* Discard received VLAN tag-stripped packet
*
* @v netdev Network device
* @v tag VLAN tag, or zero
* @v iobuf I/O buffer, or NULL
* @v rc Packet status code
*/
void vlan_netdev_rx_err ( struct net_device *netdev, unsigned int tag,
struct io_buffer *iobuf, int rc ) {
struct net_device *vlan;
/* Identify VLAN device, if applicable */
if ( tag && ( ( vlan = vlan_find ( netdev, tag ) ) != NULL ) )
netdev = vlan;
/* Hand off to network device */
netdev_rx_err ( netdev, iobuf, rc );
}