i40e: fetch indirect data for admin tx commands

i40e_bm/i40e_adminq.cc

@@ -255,7 +255,21 @@ void queue_admin_tx::cmd_run(void *desc, uint32_t idx, void *data)
 
 void queue_admin_tx::desc_fetched(void *desc, uint32_t idx)
 {
+    struct i40e_aq_desc *d = reinterpret_cast<struct i40e_aq_desc *>(desc);
+    if ((d->flags & I40E_AQ_FLAG_RD)) {
+        uint64_t addr = d->params.external.addr_low |
+            (((uint64_t) d->params.external.addr_high) << 32);
+        std::cerr << "  desc with buffer opc=" << d->opcode << " addr=" << addr
+            << std::endl;
+        data_fetch(desc, idx, addr, d->datalen);
+    } else {
         cmd_run(desc, idx, nullptr);
+    }
+}
+
+void queue_admin_tx::data_fetched(void *desc, uint32_t idx, void *data)
+{
+    cmd_run(desc, idx, data);
 }
 
 void queue_admin_tx::reg_updated()

i40e_bm/i40e_bm.h

@@ -32,6 +32,18 @@ class queue_base {
                 virtual void done();
         };
 
+        class dma_data_fetch : public dma_base {
+            protected:
+                queue_base &queue;
+            public:
+                uint32_t index;
+                void *desc;
+                dma_data_fetch(queue_base &queue_, size_t len, const void *desc,
+                        size_t desc_len);
+                virtual ~dma_data_fetch();
+                virtual void done();
+        };
+
         class dma_wb : public dma_base {
             protected:
                 queue_base &queue;
@@ -63,12 +75,15 @@ class queue_base {
         size_t desc_len;
 
         void trigger_fetch();
+        void data_fetch(const void *desc, uint32_t idx, uint64_t addr, size_t len);
         void desc_writeback(const void *desc, uint32_t idx);
         void desc_writeback_indirect(const void *desc, uint32_t idx,
                 uint64_t data_addr, const void *data, size_t data_len);
 
-        /** called when a descriptor is fetched */
+        // called when a descriptor is fetched
         virtual void desc_fetched(void *desc, uint32_t idx) = 0;
+        // called when data is fetched
+        virtual void data_fetched(void *desc, uint32_t idx, void *data) = 0;
         virtual void desc_written_back(uint32_t idx);
 
     public:
@@ -98,6 +113,8 @@ class queue_admin_tx : public queue_base {
 
         // called by base class when a descriptor has been fetched
         virtual void desc_fetched(void *desc, uint32_t idx);
+        // called by basee class when data for a descriptor has been fetched
+        virtual void data_fetched(void *desc, uint32_t idx, void *data);
 
         uint64_t &reg_base;
         uint32_t &reg_len;

i40e_bm/i40e_queues.cc

@@ -36,6 +36,20 @@ void queue_base::trigger_fetch()
     fetch_head = (fetch_head + 1) % len;
 }
 
+void queue_base::data_fetch(const void *desc, uint32_t idx, uint64_t addr,
+        size_t len)
+{
+    dma_data_fetch *dma = new dma_data_fetch(*this, len, desc, desc_len);
+    dma->write = false;
+    dma->dma_addr = addr;
+    dma->index = idx;
+
+    std::cerr << "fetching data idx=" << idx << " addr=" << addr << " len=" <<
+        len << std::endl;
+    std::cerr << "dma = " << dma << std::endl;
+    runner->issue_dma(*dma);
+}
+
 void queue_base::reg_updated()
 {
     if (!enabled)
@@ -100,6 +114,29 @@ void queue_base::dma_fetch::done()
     delete this;
 }
 
+queue_base::dma_data_fetch::dma_data_fetch(queue_base &queue_, size_t len_,
+        const void *desc_, size_t desc_len)
+    :queue(queue_)
+{
+    uint8_t *buf = new uint8_t[desc_len + len_];
+
+    desc = buf;
+    memcpy(desc, desc_, desc_len);
+
+    data = buf + desc_len;
+    len = len_;
+}
+
+queue_base::dma_data_fetch::~dma_data_fetch()
+{
+    delete[] ((uint8_t *) desc);
+}
+
+void queue_base::dma_data_fetch::done()
+{
+    queue.data_fetched(desc, index, data);
+    delete this;
+}
 
 queue_base::dma_wb::dma_wb(queue_base &queue_, size_t len_)
     : queue(queue_)