[dpdk-stable] [PATCH v2 2/2] vhost: fix max queues

[Yuanhan Liu <yuanhan.liu@linux.intel.com>]

0x8000 is the max virito-net queue pairs the virtio 1.0 spec claims to
support. While for vhost-user, it's a different story: the max vring
index could be passed by the vhost-user spec is 0xff, masked by the
VHOST_USER_VRING_IDX_MASK.

That said, the max queue pairs could vhost-user could supported is 0x80.
If user are asking more, I think the vhost-user need be extended.

Fixes: b09b198bfb5c ("vhost-user: announce queue number in message")

Cc: stable@dpdk.org
Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
---
 lib/librte_vhost/vhost.h | 15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)

diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h
index 4391e62..d97df1d 100644
--- a/lib/librte_vhost/vhost.h
+++ b/lib/librte_vhost/vhost.h
@@ -110,24 +110,15 @@ struct vhost_virtqueue {
 	uint16_t                shadow_used_idx;
 } __rte_cache_aligned;
 
-/* Old kernels have no such macro defined */
+/* Old kernels have no such macros defined */
 #ifndef VIRTIO_NET_F_GUEST_ANNOUNCE
  #define VIRTIO_NET_F_GUEST_ANNOUNCE 21
 #endif
 
-
-/*
- * Make an extra wrapper for VIRTIO_NET_F_MQ and
- * VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX as they are
- * introduced since kernel v3.8. This makes our
- * code buildable for older kernel.
- */
-#ifdef VIRTIO_NET_F_MQ
- #define VHOST_MAX_QUEUE_PAIRS		VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX
-#else
+#ifndef VIRTIO_NET_F_MQ
  #define VIRTIO_NET_F_MQ		22
- #define VHOST_MAX_QUEUE_PAIRS		0x8000
 #endif
+#define VHOST_MAX_QUEUE_PAIRS		0x80
 
 /*
  * Define virtio 1.0 for older kernels
-- 
1.9.0