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introduce concept of ifi_baudrate power factor. the idea is to work

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around the problem where high speed interfaces (such as ixgbe(4))
are not able to report real ifi_baudrate. bascially, take a spare
byte from struct if_data and use it to store ifi_baudrate power
factor. in other words,

real ifi_baudrate = ifi_baudrate * 10 ^ ifi_baudrate power factor

this should be backwards compatible with old binaries. use ixgbe(4)
as an example on how drivers would set ifi_baudrate power factor

Discussed with:	kib, scottl, glebius
MFC after:	1 week
This commit is contained in:
Maksim Yevmenkin 2012-10-16 20:18:15 +00:00
parent 88bca58512
commit 0fef97fea3
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=241616
3 changed files with 4 additions and 2 deletions
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3
sys/dev/ixgbe/ixgbe.c
View file

@ -2597,7 +2597,8 @@ ixgbe_setup_interface(device_t dev, struct adapter *adapter)
return (-1);
}
if_initname(ifp, device_get_name(dev), device_get_unit(dev));
ifp->if_baudrate = 1000000000;
ifp->if_baudrate = IF_Gbps(1);
ifp->if_baudrate_pf = 1; /* 1Gbps * 10^1 = 10Gbps */
ifp->if_init = ixgbe_init;
ifp->if_softc = adapter;
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;

2
sys/net/if.h
View file

@ -86,7 +86,7 @@ struct if_data {
u_char ifi_hdrlen; /* media header length */
u_char ifi_link_state; /* current link state */
u_char ifi_vhid; /* carp vhid */
u_char ifi_spare_char2; /* spare byte */
u_char ifi_baudrate_pf; /* baudrate power factor */
u_char ifi_datalen; /* length of this data struct */
u_long ifi_mtu; /* maximum transmission unit */
u_long ifi_metric; /* routing metric (external only) */

1
sys/net/if_var.h
View file

@ -228,6 +228,7 @@ typedef void if_init_f_t(void *);
#define if_metric if_data.ifi_metric
#define if_link_state if_data.ifi_link_state
#define if_baudrate if_data.ifi_baudrate
#define if_baudrate_pf if_data.ifi_baudrate_pf
#define if_hwassist if_data.ifi_hwassist
#define if_ipackets if_data.ifi_ipackets
#define if_ierrors if_data.ifi_ierrors