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Message-ID: <1198192906.0@teletran1>
Date: Thu, 20 Dec 2007 15:21:46 -0800
From: "Matt Carlson" <mcarlson@...adcom.com>
To: davem@...emloft.net
cc: netdev@...r.kernel.org, "Michael Chan" <mchan@...adcom.com>,
andy@...yhouse.net
Subject: [PATCH 7/8] tg3: Fix supporting flowctrl code
This patch does three things. It modifies tg3_setup_flow_control() to
use the administrator requested flow control settings if
autonegotiation is turned off. It slightly modifies the
tg3_setup_fiber_mii_phy() function to account for this new use case.
And finally, it does the same for tg3_setup_copper_phy().
The copper modifications are more than a small multi-line change. The
new code makes an attempt to avoid a link renegotiation if the link is
active at half duplex and the only difference between the current
advertised settings and requested advertised settings is the
flow control advertisements.
Signed-off-by: Matt Carlson <mcarlson@...adcom.com>
Signed-off-by: Michael Chan <mchan@...adcom.com>
diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 373642c..dd9229c 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -1694,7 +1694,8 @@ static void tg3_setup_flow_control(struct tg3 *tp, u32 local_adv, u32 remote_adv
u32 old_rx_mode = tp->rx_mode;
u32 old_tx_mode = tp->tx_mode;
- if (tp->tg3_flags & TG3_FLAG_PAUSE_AUTONEG) {
+ if (tp->link_config.autoneg == AUTONEG_ENABLE &&
+ (tp->tg3_flags & TG3_FLAG_PAUSE_AUTONEG)) {
if (tp->tg3_flags2 & TG3_FLG2_ANY_SERDES)
new_tg3_flags = tg3_resolve_flowctrl_1000X(local_adv,
remote_adv);
@@ -1975,10 +1976,44 @@ static int tg3_copper_is_advertising_all(struct tg3 *tp, u32 mask)
return 1;
}
+static int tg3_adv_1000T_flowctrl_ok(struct tg3 *tp, u32 *lcladv, u32 *rmtadv)
+{
+ u32 curadv, reqadv;
+
+ if (tg3_readphy(tp, MII_ADVERTISE, lcladv))
+ return 1;
+
+ curadv = *lcladv & (ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM);
+ reqadv = tg3_advert_flowctrl_1000T(tp->link_config.flowctrl);
+
+ if (tp->link_config.active_duplex == DUPLEX_FULL) {
+ if (curadv != reqadv)
+ return 0;
+
+ if (tp->tg3_flags & TG3_FLAG_PAUSE_AUTONEG)
+ tg3_readphy(tp, MII_LPA, rmtadv);
+ } else {
+ /* Reprogram the advertisement register, even if it
+ * does not affect the current link. If the link
+ * gets renegotiated in the future, we can save an
+ * additional renegotiation cycle by advertising
+ * it correctly in the first place.
+ */
+ if (curadv != reqadv) {
+ *lcladv &= ~(ADVERTISE_PAUSE_CAP |
+ ADVERTISE_PAUSE_ASYM);
+ tg3_writephy(tp, MII_ADVERTISE, *lcladv | reqadv);
+ }
+ }
+
+ return 1;
+}
+
static int tg3_setup_copper_phy(struct tg3 *tp, int force_reset)
{
int current_link_up;
u32 bmsr, dummy;
+ u32 lcl_adv, rmt_adv;
u16 current_speed;
u8 current_duplex;
int i, err;
@@ -2121,54 +2156,35 @@ static int tg3_setup_copper_phy(struct tg3 *tp, int force_reset)
udelay(10);
}
- if (tp->link_config.autoneg == AUTONEG_ENABLE) {
- if (bmcr & BMCR_ANENABLE) {
- current_link_up = 1;
+ lcl_adv = 0;
+ rmt_adv = 0;
- /* Force autoneg restart if we are exiting
- * low power mode.
- */
- if (!tg3_copper_is_advertising_all(tp,
- tp->link_config.advertising))
- current_link_up = 0;
- } else {
- current_link_up = 0;
+ tp->link_config.active_speed = current_speed;
+ tp->link_config.active_duplex = current_duplex;
+
+ if (tp->link_config.autoneg == AUTONEG_ENABLE) {
+ if ((bmcr & BMCR_ANENABLE) &&
+ tg3_copper_is_advertising_all(tp,
+ tp->link_config.advertising)) {
+ if (tg3_adv_1000T_flowctrl_ok(tp, &lcl_adv,
+ &rmt_adv))
+ current_link_up = 1;
}
} else {
if (!(bmcr & BMCR_ANENABLE) &&
tp->link_config.speed == current_speed &&
- tp->link_config.duplex == current_duplex) {
+ tp->link_config.duplex == current_duplex &&
+ tp->link_config.flowctrl ==
+ tp->link_config.active_flowctrl) {
current_link_up = 1;
- } else {
- current_link_up = 0;
}
}
- tp->link_config.active_speed = current_speed;
- tp->link_config.active_duplex = current_duplex;
+ if (current_link_up == 1 &&
+ tp->link_config.active_duplex == DUPLEX_FULL)
+ tg3_setup_flow_control(tp, lcl_adv, rmt_adv);
}
- if (current_link_up == 1 &&
- (tp->link_config.active_duplex == DUPLEX_FULL) &&
- (tp->link_config.autoneg == AUTONEG_ENABLE)) {
- u32 local_adv, remote_adv;
-
- if (tg3_readphy(tp, MII_ADVERTISE, &local_adv))
- local_adv = 0;
-
- if (tg3_readphy(tp, MII_LPA, &remote_adv))
- remote_adv = 0;
-
- /* If we are not advertising what has been requested,
- * bring the link down and reconfigure.
- */
- if (local_adv !=
- tg3_advert_flowctrl_1000T(tp->link_config.flowctrl)) {
- current_link_up = 0;
- } else {
- tg3_setup_flow_control(tp, local_adv, remote_adv);
- }
- }
relink:
if (current_link_up == 0 || tp->link_config.phy_is_low_power) {
u32 tmp;
@@ -2981,6 +2997,7 @@ static int tg3_setup_fiber_mii_phy(struct tg3 *tp, int force_reset)
u32 bmsr, bmcr;
u16 current_speed;
u8 current_duplex;
+ u32 local_adv, remote_adv;
tp->mac_mode |= MAC_MODE_PORT_MODE_GMII;
tw32_f(MAC_MODE, tp->mac_mode);
@@ -3014,7 +3031,8 @@ static int tg3_setup_fiber_mii_phy(struct tg3 *tp, int force_reset)
err |= tg3_readphy(tp, MII_BMCR, &bmcr);
if ((tp->link_config.autoneg == AUTONEG_ENABLE) && !force_reset &&
- (tp->tg3_flags2 & TG3_FLG2_PARALLEL_DETECT)) {
+ (tp->tg3_flags2 & TG3_FLG2_PARALLEL_DETECT) &&
+ tp->link_config.flowctrl == tp->link_config.active_flowctrl) {
/* do nothing, just check for link up at the end */
} else if (tp->link_config.autoneg == AUTONEG_ENABLE) {
u32 adv, new_adv;
@@ -3096,8 +3114,11 @@ static int tg3_setup_fiber_mii_phy(struct tg3 *tp, int force_reset)
else
current_duplex = DUPLEX_HALF;
+ local_adv = 0;
+ remote_adv = 0;
+
if (bmcr & BMCR_ANENABLE) {
- u32 local_adv, remote_adv, common;
+ u32 common;
err |= tg3_readphy(tp, MII_ADVERTISE, &local_adv);
err |= tg3_readphy(tp, MII_LPA, &remote_adv);
@@ -3108,15 +3129,15 @@ static int tg3_setup_fiber_mii_phy(struct tg3 *tp, int force_reset)
current_duplex = DUPLEX_FULL;
else
current_duplex = DUPLEX_HALF;
-
- tg3_setup_flow_control(tp, local_adv,
- remote_adv);
}
else
current_link_up = 0;
}
}
+ if (current_link_up == 1 && current_duplex == DUPLEX_FULL)
+ tg3_setup_flow_control(tp, local_adv, remote_adv);
+
tp->mac_mode &= ~MAC_MODE_HALF_DUPLEX;
if (tp->link_config.active_duplex == DUPLEX_HALF)
tp->mac_mode |= MAC_MODE_HALF_DUPLEX;
--
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