igb: Support for modifying UDP RSS flow hashing

This patch provides ability to enable or disable UDP RSS hashing. It gives
users option of generating RSS hash based on the UDP source and destination
ports numbers. Currently, UDP flow hash is always disabled in igb-driver.

Signed-off-by: Akeem G Abodunrin <akeem.g.abodunrin@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 5 deletions

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 082ce73dc627..da9fd7b8e23a 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -2874,18 +2874,21 @@ static void igb_setup_mrqc(struct igb_adapter *adapter)
 
         /* Don't need to set TUOFL or IPOFL, they default to 1 */
         wr32(E1000_RXCSUM, rxcsum);
-        /*
-         * Generate RSS hash based on TCP port numbers and/or
-         * IPv4/v6 src and dst addresses since UDP cannot be
-         * hashed reliably due to IP fragmentation
-         */
 
+        /* Generate RSS hash based on packet types, TCP/UDP
+         * port numbers and/or IPv4/v6 src and dst addresses
+         */
         mrqc = E1000_MRQC_RSS_FIELD_IPV4 |
                E1000_MRQC_RSS_FIELD_IPV4_TCP |
                E1000_MRQC_RSS_FIELD_IPV6 |
                E1000_MRQC_RSS_FIELD_IPV6_TCP |
                E1000_MRQC_RSS_FIELD_IPV6_TCP_EX;
 
+        if (adapter->flags & IGB_FLAG_RSS_FIELD_IPV4_UDP)
+                mrqc |= E1000_MRQC_RSS_FIELD_IPV4_UDP;
+        if (adapter->flags & IGB_FLAG_RSS_FIELD_IPV6_UDP)
+                mrqc |= E1000_MRQC_RSS_FIELD_IPV6_UDP;
+
         /* If VMDq is enabled then we set the appropriate mode for that, else
          * we default to RSS so that an RSS hash is calculated per packet even
          * if we are only using one queue */