diff options
Diffstat (limited to 'sys/net/if.h')
| -rw-r--r-- | sys/net/if.h | 31 |
1 files changed, 28 insertions, 3 deletions
diff --git a/sys/net/if.h b/sys/net/if.h index 39bff63..2227a97 100644 --- a/sys/net/if.h +++ b/sys/net/if.h @@ -109,17 +109,33 @@ struct if_data { struct timeval ifi_lastchange; /* time of last administrative change */ }; +/* + * Interface flags are of two types: network stack owned flags, and driver + * owned flags. Historically, these values were stored in the same ifnet + * flags field, but with the advent of fine-grained locking, they have been + * broken out such that the network stack is responsible for synchronizing + * the stack-owned fields, and the device driver the device-owned fields. + * Both halves can perform lockless reads of the other half's field, subject + * to accepting the involved races. + * + * Both sets of flags come from the same number space, and should not be + * permitted to conflict, as they are exposed to user space via a single + * field. + * + * For historical reasons, the old flag names for driver flags are exposed to + * user space. + */ #define IFF_UP 0x1 /* interface is up */ #define IFF_BROADCAST 0x2 /* broadcast address valid */ #define IFF_DEBUG 0x4 /* turn on debugging */ #define IFF_LOOPBACK 0x8 /* is a loopback net */ #define IFF_POINTOPOINT 0x10 /* interface is point-to-point link */ #define IFF_SMART 0x20 /* interface manages own routes */ -#define IFF_RUNNING 0x40 /* resources allocated */ +#define IFF_DRV_RUNNING 0x40 /* resources allocated */ #define IFF_NOARP 0x80 /* no address resolution protocol */ #define IFF_PROMISC 0x100 /* receive all packets */ #define IFF_ALLMULTI 0x200 /* receive all multicast packets */ -#define IFF_OACTIVE 0x400 /* tx hardware queue is full */ +#define IFF_DRV_OACTIVE 0x400 /* tx hardware queue is full */ #define IFF_SIMPLEX 0x800 /* can't hear own transmissions */ #define IFF_LINK0 0x1000 /* per link layer defined bit */ #define IFF_LINK1 0x2000 /* per link layer defined bit */ @@ -132,9 +148,18 @@ struct if_data { #define IFF_STATICARP 0x80000 /* static ARP */ #define IFF_NEEDSGIANT 0x100000 /* hold Giant over if_start calls */ +/* + * Old names for driver flags so that user space tools can continue to use + * the old names. + */ +#ifndef _KERNEL +#define IFF_RUNNING IFF_DRV_RUNNING +#define IFF_OACTIVE IFF_DRV_OACTIVE +#endif + /* flags set internally only: */ #define IFF_CANTCHANGE \ - (IFF_BROADCAST|IFF_POINTOPOINT|IFF_RUNNING|IFF_OACTIVE|\ + (IFF_BROADCAST|IFF_POINTOPOINT|IFF_DRV_RUNNING|IFF_DRV_OACTIVE|\ IFF_SIMPLEX|IFF_MULTICAST|IFF_ALLMULTI|IFF_SMART|IFF_PROMISC|\ IFF_POLLING) |
