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author | andre <andre@FreeBSD.org> | 2006-09-06 18:06:04 +0000 |
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committer | andre <andre@FreeBSD.org> | 2006-09-06 18:06:04 +0000 |
commit | ae5965062b9bbb95c18a0e4e157f2a1c1247263f (patch) | |
tree | b6b05de762a2431b3158b729c7340f7aaf14cf62 /sys/net/if.h | |
parent | 9e3a82aacc8c031e76f2432575ec9887d35d0d98 (diff) | |
download | FreeBSD-src-ae5965062b9bbb95c18a0e4e157f2a1c1247263f.zip FreeBSD-src-ae5965062b9bbb95c18a0e4e157f2a1c1247263f.tar.gz |
Improve description of if_capabilities, if_capenable and ifi_hwassist.
Sponsored by: TCP/IP Optimization Fundraise 2005
Diffstat (limited to 'sys/net/if.h')
-rw-r--r-- | sys/net/if.h | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/sys/net/if.h b/sys/net/if.h index 1116d4b..b989890 100644 --- a/sys/net/if.h +++ b/sys/net/if.h @@ -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 */ |