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Index: head/sys/dev/hyperv/vmbus/vmbus_brvar.h
===================================================================
--- head/sys/dev/hyperv/vmbus/vmbus_brvar.h
+++ head/sys/dev/hyperv/vmbus/vmbus_brvar.h
@@ -74,8 +74,12 @@
static __inline int
vmbus_txbr_maxpktsz(const struct vmbus_txbr *tbr)
{
- /* 1/2 data size */
- return (tbr->txbr_dsize / 2);
+ /*
+ * - 64 bits for the trailing start index (- sizeof(uint64_t)).
+ * - The rindex and windex can't be same (- 1). See
+ * the comment near vmbus_bufring.br_{r,w}index.
+ */
+ return (tbr->txbr_dsize - sizeof(uint64_t) - 1);
}
void vmbus_br_sysctl_create(struct sysctl_ctx_list *ctx,

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