[PATCH net-next v3 1/9] net: sunhme: Just restart autonegotiation if we can't bring the link up

Sean Anderson
2023-03-14T00:36:43Z

If we've tried regular autonegotiation and forcing the link mode, just
restart autonegotiation instead of reinitializing the whole NIC.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
---

(no changes since v2)

Changes in v2:
- Move happy_meal_begin_auto_negotiation earlier and remove forward declaration

drivers/net/ethernet/sun/sunhme.c | 245 +++++++++++++++---------------
1 file changed, 119 insertions(+), 126 deletions(-)

diff --git a/drivers/net/ethernet/sun/sunhme.c b/drivers/net/ethernet/sun/sunhme.c
index b0c7ab74a82e..65733ee5ddd9 100644
--- a/drivers/net/ethernet/sun/sunhme.c
+++ b/drivers/net/ethernet/sun/sunhme.c
@@ -589,8 +589,6 @@ static int set_happy_link_modes(struct happy_meal *hp, void __iomem *tregs)
return 1;
}

-static int happy_meal_init(struct happy_meal *hp);
-
static int is_lucent_phy(struct happy_meal *hp)
{
void __iomem *tregs = hp->tcvregs;
@@ -606,6 +604,124 @@ static int is_lucent_phy(struct happy_meal *hp)
return ret;
}

+/* hp->happy_lock must be held */
+static void
+happy_meal_begin_auto_negotiation(struct happy_meal *hp,
+ void __iomem *tregs,
+ const struct ethtool_link_ksettings *ep)
+{
+ int timeout;
+
+ /* Read all of the registers we are interested in now. */
+ hp->sw_bmsr = happy_meal_tcvr_read(hp, tregs, MII_BMSR);
+ hp->sw_bmcr = happy_meal_tcvr_read(hp, tregs, MII_BMCR);
+ hp->sw_physid1 = happy_meal_tcvr_read(hp, tregs, MII_PHYSID1);
+ hp->sw_physid2 = happy_meal_tcvr_read(hp, tregs, MII_PHYSID2);
+
+ /* XXX Check BMSR_ANEGCAPABLE, should not be necessary though. */
+
+ hp->sw_advertise = happy_meal_tcvr_read(hp, tregs, MII_ADVERTISE);
+ if (!ep || ep->base.autoneg == AUTONEG_ENABLE) {
+ /* Advertise everything we can support. */
+ if (hp->sw_bmsr & BMSR_10HALF)
+ hp->sw_advertise |= (ADVERTISE_10HALF);
+ else
+ hp->sw_advertise &= ~(ADVERTISE_10HALF);
+
+ if (hp->sw_bmsr & BMSR_10FULL)
+ hp->sw_advertise |= (ADVERTISE_10FULL);
+ else
+ hp->sw_advertise &= ~(ADVERTISE_10FULL);
+ if (hp->sw_bmsr & BMSR_100HALF)
+ hp->sw_advertise |= (ADVERTISE_100HALF);
+ else
+ hp->sw_advertise &= ~(ADVERTISE_100HALF);
+ if (hp->sw_bmsr & BMSR_100FULL)
+ hp->sw_advertise |= (ADVERTISE_100FULL);
+ else
+ hp->sw_advertise &= ~(ADVERTISE_100FULL);
+ happy_meal_tcvr_write(hp, tregs, MII_ADVERTISE, hp->sw_advertise);
+
+ /* XXX Currently no Happy Meal cards I know off support 100BaseT4,
+ * XXX and this is because the DP83840 does not support it, changes
+ * XXX would need to be made to the tx/rx logic in the driver as well
+ * XXX so I completely skip checking for it in the BMSR for now.
+ */
+
+ ASD("Advertising [ %s%s%s%s]\n",
+ hp->sw_advertise & ADVERTISE_10HALF ? "10H " : "",
+ hp->sw_advertise & ADVERTISE_10FULL ? "10F " : "",
+ hp->sw_advertise & ADVERTISE_100HALF ? "100H " : "",
+ hp->sw_advertise & ADVERTISE_100FULL ? "100F " : "");
+
+ /* Enable Auto-Negotiation, this is usually on already... */
+ hp->sw_bmcr |= BMCR_ANENABLE;
+ happy_meal_tcvr_write(hp, tregs, MII_BMCR, hp->sw_bmcr);
+
+ /* Restart it to make sure it is going. */
+ hp->sw_bmcr |= BMCR_ANRESTART;
+ happy_meal_tcvr_write(hp, tregs, MII_BMCR, hp->sw_bmcr);
+
+ /* BMCR_ANRESTART self clears when the process has begun. */
+
+ timeout = 64; /* More than enough. */
+ while (--timeout) {
+ hp->sw_bmcr = happy_meal_tcvr_read(hp, tregs, MII_BMCR);
+ if (!(hp->sw_bmcr & BMCR_ANRESTART))
+ break; /* got it. */
+ udelay(10);
+ }
+ if (!timeout) {
+ netdev_err(hp->dev,
+ "Happy Meal would not start auto negotiation BMCR=0x%04x\n",
+ hp->sw_bmcr);
+ netdev_notice(hp->dev,
+ "Performing force link detection.\n");
+ goto force_link;
+ } else {
+ hp->timer_state = arbwait;
+ }
+ } else {
+force_link:
+ /* Force the link up, trying first a particular mode.
+ * Either we are here at the request of ethtool or
+ * because the Happy Meal would not start to autoneg.
+ */
+
+ /* Disable auto-negotiation in BMCR, enable the duplex and
+ * speed setting, init the timer state machine, and fire it off.
+ */
+ if (!ep || ep->base.autoneg == AUTONEG_ENABLE) {
+ hp->sw_bmcr = BMCR_SPEED100;
+ } else {
+ if (ep->base.speed == SPEED_100)
+ hp->sw_bmcr = BMCR_SPEED100;
+ else
+ hp->sw_bmcr = 0;
+ if (ep->base.duplex == DUPLEX_FULL)
+ hp->sw_bmcr |= BMCR_FULLDPLX;
+ }
+ happy_meal_tcvr_write(hp, tregs, MII_BMCR, hp->sw_bmcr);
+
+ if (!is_lucent_phy(hp)) {
+ /* OK, seems we need do disable the transceiver for the first
+ * tick to make sure we get an accurate link state at the
+ * second tick.
+ */
+ hp->sw_csconfig = happy_meal_tcvr_read(hp, tregs,
+ DP83840_CSCONFIG);
+ hp->sw_csconfig &= ~(CSCONFIG_TCVDISAB);
+ happy_meal_tcvr_write(hp, tregs, DP83840_CSCONFIG,
+ hp->sw_csconfig);
+ }
+ hp->timer_state = ltrywait;
+ }
+
+ hp->timer_ticks = 0;
+ hp->happy_timer.expires = jiffies + (12 * HZ)/10; /* 1.2 sec. */
+ add_timer(&hp->happy_timer);
+}
+
static void happy_meal_timer(struct timer_list *t)
{
struct happy_meal *hp = from_timer(hp, t, happy_timer);
@@ -743,12 +859,7 @@ static void happy_meal_timer(struct timer_list *t)
netdev_notice(hp->dev,
"Link down, cable problem?\n");

- ret = happy_meal_init(hp);
- if (ret) {
- /* ho hum... */
- netdev_err(hp->dev,
- "Error, cannot re-init the Happy Meal.\n");
- }
+ happy_meal_begin_auto_negotiation(hp, tregs, NULL);
goto out;
}
if (!is_lucent_phy(hp)) {
@@ -1201,124 +1312,6 @@ static void happy_meal_init_rings(struct happy_meal *hp)
HMD("done\n");
}

-/* hp->happy_lock must be held */
-static void
-happy_meal_begin_auto_negotiation(struct happy_meal *hp,
- void __iomem *tregs,
- const struct ethtool_link_ksettings *ep)
-{
- int timeout;
-
- /* Read all of the registers we are interested in now. */
- hp->sw_bmsr = happy_meal_tcvr_read(hp, tregs, MII_BMSR);
- hp->sw_bmcr = happy_meal_tcvr_read(hp, tregs, MII_BMCR);
- hp->sw_physid1 = happy_meal_tcvr_read(hp, tregs, MII_PHYSID1);
- hp->sw_physid2 = happy_meal_tcvr_read(hp, tregs, MII_PHYSID2);
-
- /* XXX Check BMSR_ANEGCAPABLE, should not be necessary though. */
-
- hp->sw_advertise = happy_meal_tcvr_read(hp, tregs, MII_ADVERTISE);
- if (!ep || ep->base.autoneg == AUTONEG_ENABLE) {
- /* Advertise everything we can support. */
- if (hp->sw_bmsr & BMSR_10HALF)
- hp->sw_advertise |= (ADVERTISE_10HALF);
- else
- hp->sw_advertise &= ~(ADVERTISE_10HALF);
-
- if (hp->sw_bmsr & BMSR_10FULL)
- hp->sw_advertise |= (ADVERTISE_10FULL);
- else
- hp->sw_advertise &= ~(ADVERTISE_10FULL);
- if (hp->sw_bmsr & BMSR_100HALF)
- hp->sw_advertise |= (ADVERTISE_100HALF);
- else
- hp->sw_advertise &= ~(ADVERTISE_100HALF);
- if (hp->sw_bmsr & BMSR_100FULL)
- hp->sw_advertise |= (ADVERTISE_100FULL);
- else
- hp->sw_advertise &= ~(ADVERTISE_100FULL);
- happy_meal_tcvr_write(hp, tregs, MII_ADVERTISE, hp->sw_advertise);
-
- /* XXX Currently no Happy Meal cards I know off support 100BaseT4,
- * XXX and this is because the DP83840 does not support it, changes
- * XXX would need to be made to the tx/rx logic in the driver as well
- * XXX so I completely skip checking for it in the BMSR for now.
- */
-
- ASD("Advertising [ %s%s%s%s]\n",
- hp->sw_advertise & ADVERTISE_10HALF ? "10H " : "",
- hp->sw_advertise & ADVERTISE_10FULL ? "10F " : "",
- hp->sw_advertise & ADVERTISE_100HALF ? "100H " : "",
- hp->sw_advertise & ADVERTISE_100FULL ? "100F " : "");
-
- /* Enable Auto-Negotiation, this is usually on already... */
- hp->sw_bmcr |= BMCR_ANENABLE;
- happy_meal_tcvr_write(hp, tregs, MII_BMCR, hp->sw_bmcr);
-
- /* Restart it to make sure it is going. */
- hp->sw_bmcr |= BMCR_ANRESTART;
- happy_meal_tcvr_write(hp, tregs, MII_BMCR, hp->sw_bmcr);
-
- /* BMCR_ANRESTART self clears when the process has begun. */
-
- timeout = 64; /* More than enough. */
- while (--timeout) {
- hp->sw_bmcr = happy_meal_tcvr_read(hp, tregs, MII_BMCR);
- if (!(hp->sw_bmcr & BMCR_ANRESTART))
- break; /* got it. */
- udelay(10);
- }
- if (!timeout) {
- netdev_err(hp->dev,
- "Happy Meal would not start auto negotiation BMCR=0x%04x\n",
- hp->sw_bmcr);
- netdev_notice(hp->dev,
- "Performing force link detection.\n");
- goto force_link;
- } else {
- hp->timer_state = arbwait;
- }
- } else {
-force_link:
- /* Force the link up, trying first a particular mode.
- * Either we are here at the request of ethtool or
- * because the Happy Meal would not start to autoneg.
- */
-
- /* Disable auto-negotiation in BMCR, enable the duplex and
- * speed setting, init the timer state machine, and fire it off.
- */
- if (!ep || ep->base.autoneg == AUTONEG_ENABLE) {
- hp->sw_bmcr = BMCR_SPEED100;
- } else {
- if (ep->base.speed == SPEED_100)
- hp->sw_bmcr = BMCR_SPEED100;
- else
- hp->sw_bmcr = 0;
- if (ep->base.duplex == DUPLEX_FULL)
- hp->sw_bmcr |= BMCR_FULLDPLX;
- }
- happy_meal_tcvr_write(hp, tregs, MII_BMCR, hp->sw_bmcr);
-
- if (!is_lucent_phy(hp)) {
- /* OK, seems we need do disable the transceiver for the first
- * tick to make sure we get an accurate link state at the
- * second tick.
- */
- hp->sw_csconfig = happy_meal_tcvr_read(hp, tregs,
- DP83840_CSCONFIG);
- hp->sw_csconfig &= ~(CSCONFIG_TCVDISAB);
- happy_meal_tcvr_write(hp, tregs, DP83840_CSCONFIG,
- hp->sw_csconfig);
- }
- hp->timer_state = ltrywait;
- }
-
- hp->timer_ticks = 0;
- hp->happy_timer.expires = jiffies + (12 * HZ)/10; /* 1.2 sec. */
- add_timer(&hp->happy_timer);
-}
-
/* hp->happy_lock must be held */
static int happy_meal_init(struct happy_meal *hp)
{
--
2.37.1