[Bug 188369] [xen] [panic] FreeBSD 10 XENHVM panic under NetBSD Dom0 (xn_txeof: WARNING: response is -1)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=188369

--- Comment #7 from miguelmclara at gmail.com ---
Dunno if this will help in anyway... I lack C skills and I certainly don't know
much about the Xen code...


In anycase I will post my findings:

I decided to compare the changes on 9 and 10, because 9 is working for me.

I noticed that warning comes from netfront.c:
                        if (txr->status != NETIF_RSP_OKAY) {
                                printf("%s: WARNING: response is %d!\n",
                                       __func__, txr->status);
                        }

So I decided to try and find out whats "NETIF_RSP_OKAY", which apears to "come
from" sys/xen/interface/io/netif.h

This is the diff from 9 to 10 (stable) src, could any of this changes be the
cause!?


% diff -u sys/xen/interface/io/netif.h /tmp/netif.h 
--- sys/xen/interface/io/netif.h        2014-04-11 01:41:58.000000000 +0100
+++ /tmp/netif.h        2015-01-31 06:42:58.000000000 +0000
@@ -41,7 +41,7 @@
 /*
  * This is the 'wire' format for packets:
  *  Request 1: netif_tx_request -- NETTXF_* (any flags)
- * [Request 2: netif_tx_extra]  (only if request 1 has NETTXF_extra_info)
+ * [Request 2: netif_tx_extra] (only if request 1 has NETTXF_extra_info)
  * [Request 3: netif_tx_extra] (only if request 2 has
XEN_NETIF_EXTRA_FLAG_MORE)
  *  Request 4: netif_tx_request -- NETTXF_more_data
  *  Request 5: netif_tx_request -- NETTXF_more_data
@@ -173,6 +173,10 @@
 #define _NETRXF_extra_info     (3)
 #define  NETRXF_extra_info     (1U<<_NETRXF_extra_info)

+/* GSO Prefix descriptor. */
+#define _NETRXF_gso_prefix     (4)
+#define  NETRXF_gso_prefix     (1U<<_NETRXF_gso_prefix)
+
 struct netif_rx_response {
     uint16_t id;
     uint16_t offset;       /* Offset in page of start of received packet  */

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