cxgb3 - Set the CQ_ERR bit in CQ contexts.

The cxgb3 driver is incorrectly configuring the HW CQ context for CQ's
that use overflow-avoidance.  Namely the RDMA control CQ.  This results
in a bad DMA from the device to bus address 0.  The solution is to set
the CQ_ERR bit in the context for these types of CQs.
Signed-off-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/cxgb3/sge_defs.h

@@ -106,6 +106,10 @@
 #define V_CQ_GEN(x) ((x) << S_CQ_GEN)
 #define F_CQ_GEN    V_CQ_GEN(1U)
 
+#define S_CQ_ERR    30
+#define V_CQ_ERR(x) ((x) << S_CQ_ERR)
+#define F_CQ_ERR    V_CQ_ERR(1U)
+
 #define S_CQ_OVERFLOW_MODE    31
 #define V_CQ_OVERFLOW_MODE(x) ((x) << S_CQ_OVERFLOW_MODE)
 #define F_CQ_OVERFLOW_MODE    V_CQ_OVERFLOW_MODE(1U)

drivers/net/cxgb3/t3_hw.c

@@ -2046,7 +2046,8 @@ int t3_sge_init_cqcntxt(struct adapter *adapter, unsigned int id, u64 base_addr,
 	base_addr >>= 32;
 	t3_write_reg(adapter, A_SG_CONTEXT_DATA2,
 		     V_CQ_BASE_HI((u32) base_addr) | V_CQ_RSPQ(rspq) |
-		     V_CQ_GEN(1) | V_CQ_OVERFLOW_MODE(ovfl_mode));
+		     V_CQ_GEN(1) | V_CQ_OVERFLOW_MODE(ovfl_mode) |
+		     V_CQ_ERR(ovfl_mode));
 	t3_write_reg(adapter, A_SG_CONTEXT_DATA3, V_CQ_CREDITS(credits) |
 		     V_CQ_CREDIT_THRES(credit_thres));
 	return t3_sge_write_context(adapter, id, F_CQ);