checkpoint

corundum_bm/corundum_bm.cc

@@ -79,6 +79,7 @@ DescRing::setSizeLog(size_t size_log)
 
     this->_sizeLog = size_log & 0xFF;
     this->_size = 1 << this->_sizeLog;
+    this->_sizeMask = this->_size - 1;
 }
 
 void
@@ -100,6 +101,22 @@ DescRing::setTailPtr(unsigned ptr)
     this->_tailPtr = ptr;
 }
 
+TxRing::TxRing()
+{
+}
+
+TxRing::~TxRing()
+{
+}
+
+void
+TxRing::setHeadPtr(unsigned ptr)
+{
+    DescRing::setHeadPtr(ptr);
+    unsigned index = (this->_headPtr - 1) & this->_sizeMask;
+    struct Desc *desc = (struct Desc *)(this->_dmaAddr + index * DESC_SIZE);
+}
+
 Port::Port()
     : _id(0), _features(0), _mtu(0),
     _schedCount(0), _schedOffset(0), _schedStride(0),

corundum_bm/corundum_bm.h

@@ -92,6 +92,15 @@ typedef uint64_t addr_t;
 
 namespace corundum {
 
+#define DESC_SIZE 16
+
+struct Desc {
+    uint16_t rsvd0;
+    uint16_t tx_csum_cmd;
+    uint32_t len;
+    uint64_t addr;
+} __attribute__((packed)) ;
+
 class DescRing {
 public:
     DescRing();
@@ -107,19 +116,28 @@ public:
     void setDMAUpper(uint32_t addr);
     void setSizeLog(size_t size_log);
     void setIndex(unsigned index);
-    void setHeadPtr(unsigned ptr);
+    virtual void setHeadPtr(unsigned ptr);
     void setTailPtr(unsigned ptr);
 
-private:
+protected:
     addr_t _dmaAddr;
     size_t _sizeLog;
     size_t _size;
+    size_t _sizeMask;
     unsigned _index;
     unsigned _headPtr;
     unsigned _tailPtr;
     bool active;
 };
 
+class TxRing : public DescRing {
+public:
+    TxRing();
+    ~TxRing();
+
+    virtual void setHeadPtr(unsigned ptr) override;
+};
+
 class Port {
 public:
     Port();
@@ -170,7 +188,7 @@ public:
 
 private:
     DescRing eqRing;
-    DescRing txRing;
+    TxRing txRing;
     DescRing txCplRing;
     DescRing rxRing;
     DescRing rxCplRing;