[PATCH] vmxnet3: add stub for encapsulation offload

[Alexander Bulekov]

Encapsulation offload (offload mode 1) is a valid mode present in the
kernel that isn't implemented in QEMU, yet.

https://lore.kernel.org/lkml/20200528015426.8285-4-doshir@vmware.com/

Add a stub for this mode, to avoid the guest-triggerable assertion.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/517
Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
---
 hw/net/vmxnet3.c | 5 +++++
 hw/net/vmxnet3.h | 1 +
 2 files changed, 6 insertions(+)

diff --git a/hw/net/vmxnet3.c b/hw/net/vmxnet3.c
index 41f796a247..62e11d0e3e 100644
--- a/hw/net/vmxnet3.c
+++ b/hw/net/vmxnet3.c
@@ -443,6 +443,11 @@ vmxnet3_setup_tx_offloads(VMXNET3State *s)
         net_tx_pkt_build_vheader(s->tx_pkt, false, false, 0);
         break;
 
+    case VMXNET3_OM_ENCAP:
+        VMW_PKPRN("Encapsulation offload requested, but not available\n");
+        return false;
+        break;
+
     case VMXNET3_OM_CSUM:
         net_tx_pkt_build_vheader(s->tx_pkt, false, true, 0);
         VMW_PKPRN("L4 CSO requested\n");
diff --git a/hw/net/vmxnet3.h b/hw/net/vmxnet3.h
index 5b3b76ba7a..36a17b82aa 100644
--- a/hw/net/vmxnet3.h
+++ b/hw/net/vmxnet3.h
@@ -273,6 +273,7 @@ struct Vmxnet3_TxDesc {
 
 /* TxDesc.OM values */
 #define VMXNET3_OM_NONE        0
+#define VMXNET3_OM_ENCAP       1
 #define VMXNET3_OM_CSUM        2
 #define VMXNET3_OM_TSO        3
 
-- 
2.30.2