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Improve description of if_capabilities, if_capenable and ifi_hwassist.

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Sponsored by:	TCP/IP Optimization Fundraise 2005
This commit is contained in:
Andre Oppermann 2006-09-06 18:06:04 +00:00
parent a7c4fe03a8
commit 60d4ab7abb
3 changed files with 22 additions and 4 deletions
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21
sys/net/if.h
View file

@ -101,7 +101,7 @@ struct if_data {
u_long ifi_omcasts; /* packets sent via multicast */
u_long ifi_iqdrops; /* dropped on input, this interface */
u_long ifi_noproto; /* destined for unsupported protocol */
u_long ifi_hwassist; /* HW offload capabilities */
u_long ifi_hwassist; /* HW offload capabilities, see IFCAP */
time_t ifi_epoch; /* uptime at attach or stat reset */
struct timeval ifi_lastchange; /* time of last administrative change */
};
@ -180,7 +180,24 @@ struct if_data {
#define IF_Mbps(x) (IF_Kbps((x) * 1000)) /* megabits/sec. */
#define IF_Gbps(x) (IF_Mbps((x) * 1000)) /* gigabits/sec. */
/* Capabilities that interfaces can advertise. */
/*
* Capabilities that interfaces can advertise.
*
* struct ifnet.if_capabilities
* contains the optional features & capabilities a particular interface
* supports (not only the driver but also the detected hw revision).
* Capabilities are defined by IFCAP_* below.
* struct ifnet.if_capenabled
* contains the enabled (either by default or through ifconfig) optional
* features & capabilities on this interface.
* Capabilities are defined by IFCAP_* below.
* struct if_data.ifi_hwassist in mbuf CSUM_ flag form, controlled by above
* contains the enabled optional feature & capabilites that can be used
* individually per packet and are specified in the mbuf pkthdr.csum_flags
* field. IFCAP_* and CSUM_* do not match one to one and CSUM_* may be
* more detailed or differenciated that IFCAP_*.
* Hwassist features are defined CSUM_* in sys/mbuf.h
*/
#define IFCAP_RXCSUM 0x0001 /* can offload checksum on RX */
#define IFCAP_TXCSUM 0x0002 /* can offload checksum on TX */
#define IFCAP_NETCONS 0x0004 /* can be a network console */

4
sys/net/if_var.h
View file

@ -137,8 +137,8 @@ struct ifnet {
short if_timer; /* time 'til if_watchdog called */
struct ifvlantrunk *if_vlantrunk; /* pointer to 802.1q data */
int if_flags; /* up/down, broadcast, etc. */
int if_capabilities; /* interface capabilities */
int if_capenable; /* enabled features */
int if_capabilities; /* interface features & capabilities */
int if_capenable; /* enabled features & capabilities */
void *if_linkmib; /* link-type-specific MIB data */
size_t if_linkmiblen; /* length of above data */
struct if_data if_data;

1
sys/sys/mbuf.h
View file

@ -209,6 +209,7 @@ struct mbuf {
/*
* Flags indicating hw checksum support and sw checksum requirements.
* This field can be directly tested against if_data.ifi_hwassist.
*/
#define CSUM_IP 0x0001 /* will csum IP */
#define CSUM_TCP 0x0002 /* will csum TCP */