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Update if_ath(4) to check for "hint.ath.X.macaddr" for an override MAC address.

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This is used by the AR71xx platform code to choose a local MAC based on
the "board MAC address", versus whatever potentially invalid/garbage
values are stored in the Atheros calibration data.
This commit is contained in:
Adrian Chadd 2015-03-28 23:41:23 +00:00
parent b7d7ad0b90
commit 240b1f1dca
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=280799
1 changed files with 58 additions and 2 deletions
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60
sys/dev/ath/if_ath.c
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@ -510,6 +510,60 @@ ath_setup_hal_config(struct ath_softc *sc, HAL_OPS_CONFIG *ah_config)
}
/*
* Attempt to fetch the MAC address from the kernel environment.
*
* Returns 0, macaddr in macaddr if successful; -1 otherwise.
*/
static int
ath_fetch_mac_kenv(struct ath_softc *sc, uint8_t *macaddr)
{
char devid_str[32];
int local_mac = 0;
char *local_macstr;
/*
* Fetch from the kenv rather than using hints.
*
* Hints would be nice but the transition to dynamic
* hints/kenv doesn't happen early enough for this
* to work reliably (eg on anything embedded.)
*/
snprintf(devid_str, 32, "hint.%s.%d.macaddr",
device_get_name(sc->sc_dev),
device_get_unit(sc->sc_dev));
if ((local_macstr = kern_getenv(devid_str)) != NULL) {
uint32_t tmpmac[ETHER_ADDR_LEN];
int count;
int i;
/* Have a MAC address; should use it */
device_printf(sc->sc_dev,
"Overriding MAC address from environment: '%s'\n",
local_macstr);
/* Extract out the MAC address */
count = sscanf(local_macstr, "%x%*c%x%*c%x%*c%x%*c%x%*c%x",
&tmpmac[0], &tmpmac[1],
&tmpmac[2], &tmpmac[3],
&tmpmac[4], &tmpmac[5]);
if (count == 6) {
/* Valid! */
local_mac = 1;
for (i = 0; i < ETHER_ADDR_LEN; i++)
macaddr[i] = tmpmac[i];
}
/* Done! */
freeenv(local_macstr);
local_macstr = NULL;
}
if (local_mac)
return (0);
return (-1);
}
#define HAL_MODE_HT20 (HAL_MODE_11NG_HT20 | HAL_MODE_11NA_HT20)
#define HAL_MODE_HT40 \
(HAL_MODE_11NG_HT40PLUS | HAL_MODE_11NG_HT40MINUS | \
@ -1149,8 +1203,10 @@ ath_attach(u_int16_t devid, struct ath_softc *sc)
*/
sc->sc_hasveol = ath_hal_hasveol(ah);
/* get mac address from hardware */
ath_hal_getmac(ah, macaddr);
/* get mac address from kenv first, then hardware */
if (ath_fetch_mac_kenv(sc, macaddr) < 0)
ath_hal_getmac(ah, macaddr);
if (sc->sc_hasbmask)
ath_hal_getbssidmask(ah, sc->sc_hwbssidmask);