vmxnet3: iPXE compatibility fixes

iPXE vmxnet3 driver makes a few assumptions regarding device operation
that were missed during testing with Linux and Windows drivers.
This patch adds following logic:
  1. Additional GET commands processing added
  2. Max number of RX chunks should be set to 1 when driver passes 0
     via corresponding shared memory field
  3. Enforecement for max chunks number added

Signed-off-by: Dmitry Fleytman <dmitry@daynix.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/hw/vmxnet3.c b/hw/vmxnet3.c
index bdd256e9d5..1e18168e0b 100644
--- a/hw/vmxnet3.c
+++ b/hw/vmxnet3.c
@@ -1033,6 +1033,7 @@ vmxnet3_indicate_packet(VMXNET3State *s)
         is_head = false;
         ready_rxcd_pa = new_rxcd_pa;
         new_rxcd_pa = 0;
+        num_frags++;
     }
 
     if (0 != ready_rxcd_pa) {
@@ -1324,6 +1325,10 @@ static void vmxnet3_activate_device(VMXNET3State *s)
     s->max_rx_frags =
         VMXNET3_READ_DRV_SHARED16(s->drv_shmem, devRead.misc.maxNumRxSG);
 
+    if (s->max_rx_frags == 0) {
+        s->max_rx_frags = 1;
+    }
+
     VMW_CFPRN("Max RX fragments is %u", s->max_rx_frags);
 
     s->event_int_idx =
@@ -1524,6 +1529,12 @@ static uint64_t vmxnet3_get_command_status(VMXNET3State *s)
         VMW_CFPRN("Device active: %" PRIx64, ret);
         break;
 
+    case VMXNET3_CMD_RESET_DEV:
+    case VMXNET3_CMD_QUIESCE_DEV:
+    case VMXNET3_CMD_GET_QUEUE_STATUS:
+        ret = 0;
+        break;
+
     case VMXNET3_CMD_GET_LINK:
         ret = s->link_status_and_speed;
         VMW_CFPRN("Link and speed: %" PRIx64, ret);