ixgb: fix flow control

Make default flow control only have *sending* of flow control packets
enabled, and fix to disable / enable flow control correctly. Set flow
control defaults to disable receiving flow control from the link
partner, to fix the transmit fifo overlow errata

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
Signed-off-by: John Ronciak <john.ronciak@intel.com>

1 files changed, 11 insertions, 13 deletions

diff --git a/drivers/net/ixgb/ixgb_param.c b/drivers/net/ixgb/ixgb_param.c
index 8a83dfdf746d..388462cca39d 100644
--- a/drivers/net/ixgb/ixgb_param.c
+++ b/drivers/net/ixgb/ixgb_param.c
@@ -76,7 +76,7 @@ IXGB_PARAM(RxDescriptors, "Number of receive descriptors");
  *  - 2 - Tx only, generate PAUSE frames but ignore them on receive
  *  - 3 - Full Flow Control Support
  *
- * Default Value: Read flow control settings from the EEPROM
+ * Default Value: 2 - Tx only (silicon bug avoidance)
  */
 
 IXGB_PARAM(FlowControl, "Flow Control setting");
@@ -137,7 +137,7 @@ IXGB_PARAM(RxFCLowThresh, "Receive Flow Control Low Threshold");
  *
  * Valid Range: 1 - 65535 
  *
- * Default Value:  256 (0x100)
+ * Default Value:  65535 (0xffff) (we'll send an xon if we recover)
  */
 
 IXGB_PARAM(FCReqTimeout, "Flow Control Request Timeout");
@@ -165,8 +165,6 @@ IXGB_PARAM(IntDelayEnable, "Transmit Interrupt Delay Enable");
 
 #define XSUMRX_DEFAULT           OPTION_ENABLED
 
-#define FLOW_CONTROL_FULL          ixgb_fc_full
-#define FLOW_CONTROL_DEFAULT  FLOW_CONTROL_FULL
 #define DEFAULT_FCRTL                   0x28000
 #define DEFAULT_FCRTH                   0x30000
 #define MIN_FCRTL                             0
@@ -174,9 +172,9 @@ IXGB_PARAM(IntDelayEnable, "Transmit Interrupt Delay Enable");
 #define MIN_FCRTH                             8
 #define MAX_FCRTH                       0x3FFF0
 
-#define DEFAULT_FCPAUSE                 0x100   /* this may be too long */
 #define MIN_FCPAUSE                           1
 #define MAX_FCPAUSE                      0xffff
+#define DEFAULT_FCPAUSE                  0xFFFF /* this may be too long */
 
 struct ixgb_option {
         enum { enable_option, range_option, list_option } type;
@@ -336,7 +334,7 @@ ixgb_check_options(struct ixgb_adapter *adapter)
                         .type = list_option,
                         .name = "Flow Control",
                         .err  = "reading default settings from EEPROM",
-                        .def  = ixgb_fc_full,
+                        .def  = ixgb_fc_tx_pause,
                         .arg  = { .l = { .nr = LIST_LEN(fc_list),
                                          .p = fc_list }}
                 };
@@ -365,8 +363,8 @@ ixgb_check_options(struct ixgb_adapter *adapter)
                 } else {
                         adapter->hw.fc.high_water = opt.def;
                 }
-                if(!(adapter->hw.fc.type & ixgb_fc_rx_pause) )
-                        printk (KERN_INFO 
+                if (!(adapter->hw.fc.type & ixgb_fc_tx_pause) )
+                        printk (KERN_INFO
                                 "Ignoring RxFCHighThresh when no RxFC\n");
         }
         { /* Receive Flow Control Low Threshold */
@@ -385,8 +383,8 @@ ixgb_check_options(struct ixgb_adapter *adapter)
                 } else {
                         adapter->hw.fc.low_water = opt.def;
                 }
-                if(!(adapter->hw.fc.type & ixgb_fc_rx_pause) )
-                        printk (KERN_INFO 
+                if (!(adapter->hw.fc.type & ixgb_fc_tx_pause) )
+                        printk (KERN_INFO
                                 "Ignoring RxFCLowThresh when no RxFC\n");
         }
         { /* Flow Control Pause Time Request*/
@@ -406,12 +404,12 @@ ixgb_check_options(struct ixgb_adapter *adapter)
                 } else {
                         adapter->hw.fc.pause_time = opt.def;
                 }
-                if(!(adapter->hw.fc.type & ixgb_fc_rx_pause) )
-                        printk (KERN_INFO 
+                if (!(adapter->hw.fc.type & ixgb_fc_tx_pause) )
+                        printk (KERN_INFO
                                 "Ignoring FCReqTimeout when no RxFC\n");
         }
         /* high low and spacing check for rx flow control thresholds */
-        if (adapter->hw.fc.type & ixgb_fc_rx_pause) {
+        if (adapter->hw.fc.type & ixgb_fc_tx_pause) {
                 /* high must be greater than low */
                 if (adapter->hw.fc.high_water < (adapter->hw.fc.low_water + 8)) {
                         /* set defaults */