vmxnet3: gso fixes

outbound:
wrong header len computation
gso size and header length need to be set in the first segment of the
chain

inbound:
EOP may have zero length descriptor to terminate the chain
missing endian conversion for ethertype

Type: fix

Signed-off-by: Steven Luong <sluong@cisco.com>
Change-Id: Iaa003c0e9af3ead4df6c6c0d5772a179d2ff15c4
(cherry picked from commit 007abe751f2ee86528d0ccc005a3da1c90850868)

4 files changed, 29 insertions, 13 deletions

diff --git a/src/plugins/vmxnet3/FEATURE.yaml b/src/plugins/vmxnet3/FEATURE.yaml
index 1e303f6d6ee..d204659fb34 100644
--- a/src/plugins/vmxnet3/FEATURE.yaml
+++ b/src/plugins/vmxnet3/FEATURE.yaml
@@ -4,6 +4,7 @@ maintainer: Steven Luong <sluong@cisco.com>
 features:
   - vmxnet3 device driver to connect to ESXi server, VMWare Fusion, and VMWare
     Workstation
+  - Supports GSO. It was tested on ESXi 6.7
 description: "vmxnet3 device driver support"
 state: production
 properties: [API, CLI, STATS, MULTITHREAD]
diff --git a/src/plugins/vmxnet3/input.c b/src/plugins/vmxnet3/input.c
index 173ab915b2b..f182409ac59 100644
--- a/src/plugins/vmxnet3/input.c
+++ b/src/plugins/vmxnet3/input.c
@@ -269,7 +269,6 @@ vmxnet3_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
       b0->flags = 0;
       b0->error = 0;
       b0->current_config_index = 0;
-      ASSERT (b0->current_length != 0);
 
       if (PREDICT_FALSE ((rx_comp->index & VMXNET3_RXCI_EOP) &&
 			 (rx_comp->len & VMXNET3_RXCL_ERROR)))
@@ -317,12 +316,19 @@ vmxnet3_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
       else if (rx_comp->index & VMXNET3_RXCI_EOP)
 	{
 	  /* end of segment */
-	  if (prev_b0)
+	  if (PREDICT_TRUE (prev_b0 != 0))
 	    {
-	      prev_b0->flags |= VLIB_BUFFER_NEXT_PRESENT;
-	      prev_b0->next_buffer = bi0;
-	      hb->total_length_not_including_first_buffer +=
-		b0->current_length;
+	      if (PREDICT_TRUE (b0->current_length != 0))
+		{
+		  prev_b0->flags |= VLIB_BUFFER_NEXT_PRESENT;
+		  prev_b0->next_buffer = bi0;
+		  hb->total_length_not_including_first_buffer +=
+		    b0->current_length;
+		}
+	      else
+		{
+		  vlib_buffer_free_one (vm, bi0);
+		}
 	      prev_b0 = 0;
 	      got_packet = 1;
 	    }
@@ -387,7 +393,7 @@ vmxnet3_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 	      ethernet_header_t *e = (ethernet_header_t *) hb->data;
 
 	      next[0] = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
-	      if (!ethernet_frame_is_tagged (e->type))
+	      if (!ethernet_frame_is_tagged (ntohs (e->type)))
 		vmxnet3_handle_offload (rx_comp, hb, gso_size);
 	    }
 
diff --git a/src/plugins/vmxnet3/output.c b/src/plugins/vmxnet3/output.c
index 81a1afb190c..4c9b7093f73 100644
--- a/src/plugins/vmxnet3/output.c
+++ b/src/plugins/vmxnet3/output.c
@@ -20,6 +20,8 @@
 #include <vlib/pci/pci.h>
 #include <vnet/ethernet/ethernet.h>
 #include <vnet/devices/devices.h>
+#include <vnet/ip/ip6_packet.h>
+#include <vnet/ip/ip4_packet.h>
 
 #include <vmxnet3/vmxnet3.h>
 
@@ -128,6 +130,7 @@ VNET_DEVICE_CLASS_TX_FN (vmxnet3_device_class) (vlib_main_t * vm,
     {
       u16 space_needed = 1, i;
       u32 gso_size = 0;
+      u32 l4_hdr_sz;
       vlib_buffer_t *b;
       u32 hdr_len = 0;
 
@@ -193,8 +196,13 @@ VNET_DEVICE_CLASS_TX_FN (vmxnet3_device_class) (vlib_main_t * vm,
 	       */
 	      ASSERT (vd->gso_enable == 1);
 	      gso_size = vnet_buffer2 (b0)->gso_size;
-	      hdr_len = vnet_buffer (b0)->l4_hdr_offset +
-		sizeof (ethernet_header_t);
+	      l4_hdr_sz = vnet_buffer2 (b0)->gso_l4_hdr_sz;
+	      if (b0->flags & VNET_BUFFER_F_IS_IP6)
+		hdr_len = sizeof (ethernet_header_t) + sizeof (ip6_header_t) +
+		  l4_hdr_sz;
+	      else
+		hdr_len = sizeof (ethernet_header_t) + sizeof (ip4_header_t) +
+		  l4_hdr_sz;
 	    }
 
 	  generation = txq->tx_ring.gen;
@@ -202,9 +210,9 @@ VNET_DEVICE_CLASS_TX_FN (vmxnet3_device_class) (vlib_main_t * vm,
 	}
       if (PREDICT_FALSE (gso_size != 0))
 	{
-	  txd->flags[1] = hdr_len;
-	  txd->flags[1] |= VMXNET3_TXF_OM (VMXNET3_OM_TSO);
-	  txd->flags[0] |= VMXNET3_TXF_MSSCOF (gso_size);
+	  txq->tx_desc[first_idx].flags[1] = hdr_len;
+	  txq->tx_desc[first_idx].flags[1] |= VMXNET3_TXF_OM (VMXNET3_OM_TSO);
+	  txq->tx_desc[first_idx].flags[0] |= VMXNET3_TXF_MSSCOF (gso_size);
 	}
       txd->flags[1] |= VMXNET3_TXF_CQ | VMXNET3_TXF_EOP;
       asm volatile ("":::"memory");
diff --git a/src/plugins/vmxnet3/vmxnet3.c b/src/plugins/vmxnet3/vmxnet3.c
index 731a34a99e1..9209c3e2f90 100644
--- a/src/plugins/vmxnet3/vmxnet3.c
+++ b/src/plugins/vmxnet3/vmxnet3.c
@@ -809,7 +809,8 @@ vmxnet3_create_if (vlib_main_t * vm, vmxnet3_create_if_args_t * args)
   vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, vd->hw_if_index);
   hw->flags |= VNET_HW_INTERFACE_FLAG_SUPPORTS_INT_MODE;
   if (vd->gso_enable)
-    hw->flags |= VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO;
+    hw->flags |= (VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO |
+		  VNET_HW_INTERFACE_FLAG_SUPPORTS_TX_L4_CKSUM_OFFLOAD);
 
   vnet_hw_interface_set_input_node (vnm, vd->hw_if_index,
 				    vmxnet3_input_node.index);