diff options
Diffstat (limited to 'sys/dev/hyperv/vmbus/vmbus_brvar.h')
| -rw-r--r-- | sys/dev/hyperv/vmbus/vmbus_brvar.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/sys/dev/hyperv/vmbus/vmbus_brvar.h b/sys/dev/hyperv/vmbus/vmbus_brvar.h index da0ca9d8f535..bd967f6e869b 100644 --- a/sys/dev/hyperv/vmbus/vmbus_brvar.h +++ b/sys/dev/hyperv/vmbus/vmbus_brvar.h @@ -74,6 +74,7 @@ struct sysctl_oid; static __inline int vmbus_txbr_maxpktsz(const struct vmbus_txbr *tbr) { + /* * - 64 bits for the trailing start index (- sizeof(uint64_t)). * - The rindex and windex can't be same (- 1). See @@ -82,6 +83,17 @@ vmbus_txbr_maxpktsz(const struct vmbus_txbr *tbr) return (tbr->txbr_dsize - sizeof(uint64_t) - 1); } +static __inline int +vmbus_br_nelem(int br_size, int elem_size) +{ + + /* Strip bufring header */ + br_size -= sizeof(struct vmbus_bufring); + /* Add per-element trailing index */ + elem_size += sizeof(uint64_t); + return (br_size / elem_size); +} + void vmbus_br_sysctl_create(struct sysctl_ctx_list *ctx, struct sysctl_oid *br_tree, struct vmbus_br *br, const char *name); |