Ethernet devices have an RSS option to tell the driver to

use Receive side scaling

dev/ns_gige.cc:
dev/ns_gige.hh:
dev/ns_gige_reg.h:
dev/sinic.cc:
dev/sinic.hh:
dev/sinicreg.hh:
    add support for setting the RSS flag to notify the driver
    to use RSS

--HG--
extra : convert_revision : 5f0c11668ae976634b3bf0caad669a9464a4c041

7 files changed, 17 insertions, 2 deletions

diff --git a/dev/ns_gige.cc b/dev/ns_gige.cc
index d6df347bc..ed8c794f9 100644
--- a/dev/ns_gige.cc
+++ b/dev/ns_gige.cc
@@ -767,6 +767,8 @@ NSGigE::read(MemReqPtr &req, uint8_t *data)
                     reg |= M5REG_RX_THREAD;
                 if (params()->tx_thread)
                     reg |= M5REG_TX_THREAD;
+                if (params()->rss)
+                    reg |= M5REG_RSS;
                 break;
 
               default:
@@ -3009,6 +3011,7 @@ BEGIN_DECLARE_SIM_OBJECT_PARAMS(NSGigE)
     Param<string> hardware_address;
     Param<bool> rx_thread;
     Param<bool> tx_thread;
+    Param<bool> rss;
 
 END_DECLARE_SIM_OBJECT_PARAMS(NSGigE)
 
@@ -3048,7 +3051,8 @@ BEGIN_INIT_SIM_OBJECT_PARAMS(NSGigE)
     INIT_PARAM(rx_filter, "Enable Receive Filter"),
     INIT_PARAM(hardware_address, "Ethernet Hardware Address"),
     INIT_PARAM(rx_thread, ""),
-    INIT_PARAM(tx_thread, "")
+    INIT_PARAM(tx_thread, ""),
+    INIT_PARAM(rss, "")
 
 END_INIT_SIM_OBJECT_PARAMS(NSGigE)
 
@@ -3093,6 +3097,7 @@ CREATE_SIM_OBJECT(NSGigE)
     params->eaddr = hardware_address;
     params->rx_thread = rx_thread;
     params->tx_thread = tx_thread;
+    params->rss = rss;
 
     return new NSGigE(params);
 }
diff --git a/dev/ns_gige.hh b/dev/ns_gige.hh
index cdd8e4b9e..59c55056e 100644
--- a/dev/ns_gige.hh
+++ b/dev/ns_gige.hh
@@ -385,6 +385,7 @@ class NSGigE : public PciDev
         uint32_t rx_fifo_size;
         bool rx_thread;
         bool tx_thread;
+        bool rss;
         bool dma_no_allocate;
     };
 
diff --git a/dev/ns_gige_reg.h b/dev/ns_gige_reg.h
index eadc60d03..5f6fa2cc5 100644
--- a/dev/ns_gige_reg.h
+++ b/dev/ns_gige_reg.h
@@ -306,6 +306,7 @@
 
 /* M5 control register */
 #define M5REG_RESERVED		0xfffffffc
+#define M5REG_RSS		0x00000004
 #define M5REG_RX_THREAD		0x00000002
 #define M5REG_TX_THREAD		0x00000001
 
diff --git a/dev/sinic.cc b/dev/sinic.cc
index 34b4213e0..363994919 100644
--- a/dev/sinic.cc
+++ b/dev/sinic.cc
@@ -761,6 +761,8 @@ Device::reset()
         regs.Config |= Config_RxThread;
     if (params()->tx_thread)
         regs.Config |= Config_TxThread;
+    if (params()->rss)
+        regs.Config |= Config_RSS;
     regs.IntrMask = Intr_Soft | Intr_RxHigh | Intr_RxPacket | Intr_TxLow;
     regs.RxMaxCopy = params()->rx_max_copy;
     regs.TxMaxCopy = params()->tx_max_copy;
@@ -1624,6 +1626,7 @@ BEGIN_DECLARE_SIM_OBJECT_PARAMS(Device)
     Param<string> hardware_address;
     Param<bool> rx_thread;
     Param<bool> tx_thread;
+    Param<bool> rss;
 
 END_DECLARE_SIM_OBJECT_PARAMS(Device)
 
@@ -1666,7 +1669,8 @@ BEGIN_INIT_SIM_OBJECT_PARAMS(Device)
     INIT_PARAM(rx_filter, "Enable Receive Filter"),
     INIT_PARAM(hardware_address, "Ethernet Hardware Address"),
     INIT_PARAM(rx_thread, ""),
-    INIT_PARAM(tx_thread, "")
+    INIT_PARAM(tx_thread, ""),
+    INIT_PARAM(rss, "")
 
 END_INIT_SIM_OBJECT_PARAMS(Device)
 
@@ -1714,6 +1718,7 @@ CREATE_SIM_OBJECT(Device)
     params->eaddr = hardware_address;
     params->rx_thread = rx_thread;
     params->tx_thread = tx_thread;
+    params->rss = rss;
 
     return new Device(params);
 }
diff --git a/dev/sinic.hh b/dev/sinic.hh
index c4027be86..25172fa45 100644
--- a/dev/sinic.hh
+++ b/dev/sinic.hh
@@ -355,6 +355,7 @@ class Device : public Base
         bool dma_no_allocate;
         bool rx_thread;
         bool tx_thread;
+        bool rss;
     };
 
   protected:
diff --git a/dev/sinicreg.hh b/dev/sinicreg.hh
index fc1f4c06b..f90432398 100644
--- a/dev/sinicreg.hh
+++ b/dev/sinicreg.hh
@@ -81,6 +81,7 @@ __SINIC_REG32(HwAddr,      0x60); // 64: mac address
 __SINIC_REG32(Size,        0x68); // register addres space size
 
 // Config register bits
+__SINIC_VAL32(Config_RSS,      10, 1); // enable receive side scaling
 __SINIC_VAL32(Config_RxThread,  9, 1); // enable receive threads
 __SINIC_VAL32(Config_TxThread,  8, 1); // enable transmit thread
 __SINIC_VAL32(Config_Filter,    7, 1); // enable receive filter
diff --git a/python/m5/objects/Ethernet.py b/python/m5/objects/Ethernet.py
index 3a7f88d04..6113e656f 100644
--- a/python/m5/objects/Ethernet.py
+++ b/python/m5/objects/Ethernet.py
@@ -86,6 +86,7 @@ class EtherDevBase(PciDevice):
     intr_delay = Param.Latency('10us', "Interrupt propagation delay")
     rx_thread = Param.Bool(False, "dedicated kernel thread for transmit")
     tx_thread = Param.Bool(False, "dedicated kernel threads for receive")
+    rss = Param.Bool(False, "Receive Side Scaling")
 
 class NSGigE(EtherDevBase):
     type = 'NSGigE'