ixgbe: A fix to VF TX rate limit

There is a need to configure MMW_SIZE in register RTTBCNRM with a correct
value (0x4 for non jumbo frames and 0x14 for jumbo frames support).
For 82599 the value is 0x4 and for X540 the value is 0x14.

Signed-off-by: Lior Levy <lior.levy@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

2 files changed, 17 insertions, 1 deletions

diff --git a/drivers/net/ixgbe/ixgbe_sriov.c b/drivers/net/ixgbe/ixgbe_sriov.c
index ac99b0458fe2..d99d01e21326 100644
--- a/drivers/net/ixgbe/ixgbe_sriov.c
+++ b/drivers/net/ixgbe/ixgbe_sriov.c
@@ -605,6 +605,22 @@ static void ixgbe_set_vf_rate_limit(struct ixgbe_hw *hw, int vf, int tx_rate,
         }
 
         IXGBE_WRITE_REG(hw, IXGBE_RTTDQSEL, 2*vf); /* vf Y uses queue 2*Y */
+        /*
+         * Set global transmit compensation time to the MMW_SIZE in RTTBCNRM
+         * register. Typically MMW_SIZE=0x014 if 9728-byte jumbo is supported
+         * and 0x004 otherwise.
+         */
+        switch (hw->mac.type) {
+        case ixgbe_mac_82599EB:
+                IXGBE_WRITE_REG(hw, IXGBE_RTTBCNRM, 0x4);
+                break;
+        case ixgbe_mac_X540:
+                IXGBE_WRITE_REG(hw, IXGBE_RTTBCNRM, 0x14);
+                break;
+        default:
+                break;
+        }
+
         IXGBE_WRITE_REG(hw, IXGBE_RTTBCNRC, bcnrc_val);
 }
 
diff --git a/drivers/net/ixgbe/ixgbe_type.h b/drivers/net/ixgbe/ixgbe_type.h
index 1eefc0c68409..e0d970ebab7a 100644
--- a/drivers/net/ixgbe/ixgbe_type.h
+++ b/drivers/net/ixgbe/ixgbe_type.h
@@ -534,7 +534,7 @@
 #define IXGBE_RTTBCNRC_RF_INT_SHIFT     14
 #define IXGBE_RTTBCNRC_RF_INT_MASK      \
         (IXGBE_RTTBCNRC_RF_DEC_MASK << IXGBE_RTTBCNRC_RF_INT_SHIFT)
-
+#define IXGBE_RTTBCNRM    0x04980
 
 /* FCoE DMA Context Registers */
 #define IXGBE_FCPTRL    0x02410 /* FC User Desc. PTR Low */