From ed56ef675ae6ef0e6f7d42b9c42dae61172f0960 Mon Sep 17 00:00:00 2001 From: Dexuan Cui Date: Thu, 5 Sep 2019 23:01:16 +0000 Subject: [PATCH] Drivers: hv: vmbus: Add a helper function is_sub_channel() The existing method of telling if a channel is sub-channel in vmbus_process_offer() is cumbersome. This new simple helper function is preferred in future. Signed-off-by: Dexuan Cui Reviewed-by: Michael Kelley Signed-off-by: Sasha Levin --- include/linux/hyperv.h | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index 6256cc34c4a6..2d39248cff96 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -245,7 +245,10 @@ struct vmbus_channel_offer { } pipe; } u; /* - * The sub_channel_index is defined in win8. + * The sub_channel_index is defined in Win8: a value of zero means a + * primary channel and a value of non-zero means a sub-channel. + * + * Before Win8, the field is reserved, meaning it's always zero. */ u16 sub_channel_index; u16 reserved3; @@ -934,6 +937,11 @@ static inline bool is_hvsock_channel(const struct vmbus_channel *c) VMBUS_CHANNEL_TLNPI_PROVIDER_OFFER); } +static inline bool is_sub_channel(const struct vmbus_channel *c) +{ + return c->offermsg.offer.sub_channel_index != 0; +} + static inline void set_channel_affinity_state(struct vmbus_channel *c, enum hv_numa_policy policy) { -- 2.11.0