cxgb3 - Fix potential MAC hang

Under rare conditions, the MAC might hang while generating a pause frame.
This patch fine tunes the MAC settings to avoid the issue, allows for
periodic MAC state check, and triggers a recovery if hung.

Also fix one MAC statistics counter for the rev board T3B2.

Signed-off-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/net/cxgb3/common.h b/drivers/net/cxgb3/common.h
index e23deeb7d06d..85e5543cfb57 100644
--- a/drivers/net/cxgb3/common.h
+++ b/drivers/net/cxgb3/common.h
@@ -260,6 +260,10 @@ struct mac_stats {
         unsigned long serdes_signal_loss;
         unsigned long xaui_pcs_ctc_err;
         unsigned long xaui_pcs_align_change;
+
+        unsigned long num_toggled; /* # times toggled TxEn due to stuck TX */
+        unsigned long num_resets;  /* # times reset due to stuck TX */
+
 };
 
 struct tp_mib_stats {
@@ -400,6 +404,12 @@ struct adapter_params {
         unsigned int rev;       /* chip revision */
 };
 
+enum {                                      /* chip revisions */
+        T3_REV_A  = 0,
+        T3_REV_B  = 2,
+        T3_REV_B2 = 3,
+};
+
 struct trace_params {
         u32 sip;
         u32 sip_mask;
@@ -465,6 +475,10 @@ struct cmac {
         struct adapter *adapter;
         unsigned int offset;
         unsigned int nucast;    /* # of address filters for unicast MACs */
+        unsigned int tcnt;
+        unsigned int xcnt;
+        unsigned int toggle_cnt;
+        unsigned int txen;
         struct mac_stats stats;
 };
 
@@ -666,6 +680,7 @@ int t3_mac_set_address(struct cmac *mac, unsigned int idx, u8 addr[6]);
 int t3_mac_set_num_ucast(struct cmac *mac, int n);
 const struct mac_stats *t3_mac_update_stats(struct cmac *mac);
 int t3_mac_set_speed_duplex_fc(struct cmac *mac, int speed, int duplex, int fc);
+int t3b2_mac_watchdog_task(struct cmac *mac);
 
 void t3_mc5_prep(struct adapter *adapter, struct mc5 *mc5, int mode);
 int t3_mc5_init(struct mc5 *mc5, unsigned int nservers, unsigned int nfilters,