patches for DPDK stable branches
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From: Yuanhan Liu <yuanhan.liu@linux.intel.com>
To: dev@dpdk.org
Cc: Maxime Coquelin <maxime.coquelin@redhat.com>,
	Yuanhan Liu <yuanhan.liu@linux.intel.com>,
	stable@dpdk.org
Subject: [dpdk-stable] [PATCH v2 2/2] vhost: fix max queues
Date: Wed,  1 Mar 2017 18:41:59 +0800	[thread overview]
Message-ID: <1488364919-22897-2-git-send-email-yuanhan.liu@linux.intel.com> (raw)
In-Reply-To: <1488364919-22897-1-git-send-email-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

  reply	other threads:[~2017-03-01 10:43 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-02-23  8:45 [dpdk-stable] [PATCH] vhost: fix multiple queue not being enabled for older kernels Yuanhan Liu
2017-03-01  8:16 ` Maxime Coquelin
2017-03-01 10:41 ` [dpdk-stable] [PATCH v2 1/2] " Yuanhan Liu
2017-03-01 10:41   ` Yuanhan Liu [this message]
2017-03-22  8:36     ` [dpdk-stable] [PATCH v2 2/2] vhost: fix max queues Yuanhan Liu

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