cxgb3: disable high freq non-data interrupts
Under RX pressure, The HW might generate a high load of interrupts
to signal mac fifo or free lists overflow.
Disable the interrupts, and poll the relevant status bits
to maintain stats.
Signed-off-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/cxgb3/cxgb3_main.c b/drivers/net/cxgb3/cxgb3_main.c
index c32f514..9ff0452 100644
--- a/drivers/net/cxgb3/cxgb3_main.c
+++ b/drivers/net/cxgb3/cxgb3_main.c
@@ -2471,6 +2471,8 @@
struct adapter *adapter = container_of(work, struct adapter,
adap_check_task.work);
const struct adapter_params *p = &adapter->params;
+ int port;
+ unsigned int v, status, reset;
adapter->check_task_cnt++;
@@ -2489,6 +2491,54 @@
if (p->rev == T3_REV_B2)
check_t3b2_mac(adapter);
+ /*
+ * Scan the XGMAC's to check for various conditions which we want to
+ * monitor in a periodic polling manner rather than via an interrupt
+ * condition. This is used for conditions which would otherwise flood
+ * the system with interrupts and we only really need to know that the
+ * conditions are "happening" ... For each condition we count the
+ * detection of the condition and reset it for the next polling loop.
+ */
+ for_each_port(adapter, port) {
+ struct cmac *mac = &adap2pinfo(adapter, port)->mac;
+ u32 cause;
+
+ cause = t3_read_reg(adapter, A_XGM_INT_CAUSE + mac->offset);
+ reset = 0;
+ if (cause & F_RXFIFO_OVERFLOW) {
+ mac->stats.rx_fifo_ovfl++;
+ reset |= F_RXFIFO_OVERFLOW;
+ }
+
+ t3_write_reg(adapter, A_XGM_INT_CAUSE + mac->offset, reset);
+ }
+
+ /*
+ * We do the same as above for FL_EMPTY interrupts.
+ */
+ status = t3_read_reg(adapter, A_SG_INT_CAUSE);
+ reset = 0;
+
+ if (status & F_FLEMPTY) {
+ struct sge_qset *qs = &adapter->sge.qs[0];
+ int i = 0;
+
+ reset |= F_FLEMPTY;
+
+ v = (t3_read_reg(adapter, A_SG_RSPQ_FL_STATUS) >> S_FL0EMPTY) &
+ 0xffff;
+
+ while (v) {
+ qs->fl[i].empty += (v & 1);
+ if (i)
+ qs++;
+ i ^= 1;
+ v >>= 1;
+ }
+ }
+
+ t3_write_reg(adapter, A_SG_INT_CAUSE, reset);
+
/* Schedule the next check update if any port is active. */
spin_lock_irq(&adapter->work_lock);
if (adapter->open_device_map & PORT_MASK)