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Change semantics of network API so that packet-absorbing calls *always*

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take ownership of the packet, rather than doing so only if they return
success.  This breaks semantic compatibility with Linux's
hard_start_xmit() method, but means that we don't have to worry so much
about error cases.

Split mechanism of processing received packets (net_rx_process()) out
from policy (net_step()), preparatory to putting net_step() in a separate
object.
This commit is contained in:
Michael Brown
2006-04-29 17:17:43 +00:00
parent 23c494d14e
commit bac97eb979
4 changed files with 100 additions and 59 deletions
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19
src/include/gpxe/netdevice.h
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@@ -103,15 +103,14 @@ struct net_protocol {
int ( * route ) ( const struct pk_buff *pkb,
struct net_header *nethdr );
/**
* Handle received packets
* Process received packet
*
* @v pkb Packet buffer
* @ret rc Return status code
*
* If this method returns success, it has taken ownership of
* the packet buffer.
* This method takes ownership of the packet buffer.
*/
int ( * rx ) ( struct pk_buff *pkb );
int ( * rx_process ) ( struct pk_buff *pkb );
/**
* Transcribe network-layer address
*
@@ -240,9 +239,9 @@ struct net_device {
* This method should cause the hardware to initiate
* transmission of the packet buffer.
*
* If the method returns success, ownership of the packet
* buffer is transferred to the @c net_device, which must
* eventually call free_pkb() to release the buffer.
* Ownership of the packet buffer is transferred to the @c
* net_device, which must eventually call free_pkb() to
* release the buffer.
*/
int ( * transmit ) ( struct net_device *netdev, struct pk_buff *pkb );
/** Poll for received packet
@@ -332,9 +331,8 @@ free_netdev ( struct net_device *netdev __attribute__ (( unused )) ) {
* @ret rc Return status code
*
* Transmits the packet via the specified network device. The
* link-layer header must already have been filled in. If this
* function returns success, it has taken ownership of the packet
* buffer.
* link-layer header must already have been filled in. This function
* takes ownership of the packet buffer.
*/
static inline int netdev_transmit ( struct net_device *netdev,
struct pk_buff *pkb ) {
@@ -375,5 +373,6 @@ extern int net_transmit_via ( struct pk_buff *pkb, struct net_device *netdev );
extern int net_transmit ( struct pk_buff *pkb );
extern int net_poll ( void );
extern struct pk_buff * net_rx_dequeue ( void );
extern int net_rx_process ( struct pk_buff *pkb );
#endif /* _GPXE_NETDEVICE_H */