net/ixgbe: fix TC bandwidth setting

4 and 8 TCs are supported on ixgbe. By default there're
8 TCs. So when initializing the device, the bandwidth for
8 TCs is set.
When changing the TC number, it's only considered setting
the bandwidth for 4 TCs. If the user change the number
from 4 to 8, the TCs' bandwidth is not right.

Fixes: 0807f80d35d0 ("ixgbe: DCB / flow control")
Cc: stable@dpdk.org
Signed-off-by: Wenzhuo Lu <wenzhuo.lu@intel.com>

diff --git a/drivers/net/ixgbe/ixgbe_rxtx.c b/drivers/net/ixgbe/ixgbe_rxtx.c
index e5b7cab..c9993ab 100644 (file)
--- a/drivers/net/ixgbe/ixgbe_rxtx.c
+++ b/drivers/net/ixgbe/ixgbe_rxtx.c
@@ -3814,6 +3814,15 @@ ixgbe_dcb_hw_configure(struct rte_eth_dev *dev,
                        tc->path[IXGBE_DCB_TX_CONFIG].bwg_percent = 0;
                        tc->path[IXGBE_DCB_RX_CONFIG].bwg_percent = 0;
                }
+       } else {
+               /* Re-configure 8 TCs BW */
+               for (i = 0; i < nb_tcs; i++) {
+                       tc = &dcb_config->tc_config[i];
+                       tc->path[IXGBE_DCB_TX_CONFIG].bwg_percent =
+                               (uint8_t)(100 / nb_tcs + (i & 1));
+                       tc->path[IXGBE_DCB_RX_CONFIG].bwg_percent =
+                               (uint8_t)(100 / nb_tcs + (i & 1));
+               }
        }
 
        switch (hw->mac.type) {