[dpdk-dev] vhost: fix build error on old kernel doesn't support MQ
Commit Message
Fix build error:
virtio-net.c:80:89: error: ‘VIRTIO_NET_F_MQ’ undeclared here
rte_virtio_net.h:109: error: ‘VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX’ undeclared here
Above two virtio-net MQ macros are introduced since kernel v3.8.
For older kernel, we should not reference them directly, hence,
this patch introduced two wrapper macros, with proper values
being set depending on we support MQ or not.
Fixes: 19d4d7ef2a21 ("vhost-user: enable multiple queue")
Reported-by: Gu YongjieX <yongjiex.gu@intel.com>
Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
---
lib/librte_vhost/rte_virtio_net.h | 17 ++++++++++++++++-
lib/librte_vhost/vhost_user/vhost-net-user.c | 2 +-
lib/librte_vhost/virtio-net.c | 2 +-
3 files changed, 18 insertions(+), 3 deletions(-)
Comments
On Thu, Oct 29, 2015 at 4:37 AM, Yuanhan Liu <yuanhan.liu@linux.intel.com>
wrote:
> Fix build error:
>
> virtio-net.c:80:89: error: ‘VIRTIO_NET_F_MQ’ undeclared here
> rte_virtio_net.h:109: error: ‘VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX’
> undeclared here
>
> Above two virtio-net MQ macros are introduced since kernel v3.8.
> For older kernel, we should not reference them directly, hence,
> this patch introduced two wrapper macros, with proper values
> being set depending on we support MQ or not.
>
> Fixes: 19d4d7ef2a21 ("vhost-user: enable multiple queue")
>
Not sure about this fix line as a build error first appeared for me at
b09b198bfb5c ("vhost-user: announce queue number in message")
> Reported-by: Gu YongjieX <yongjiex.gu@intel.com>
> Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
>
Build restored on kernel 3.2 with this fixed applied.
Tested-by: David Marchand <david.marchand@6wind.com>
2015-10-30 15:40, David Marchand:
> On Thu, Oct 29, 2015 at 4:37 AM, Yuanhan Liu <yuanhan.liu@linux.intel.com>
> wrote:
>
> > Fix build error:
> >
> > virtio-net.c:80:89: error: ‘VIRTIO_NET_F_MQ’ undeclared here
> > rte_virtio_net.h:109: error: ‘VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX’
> > undeclared here
> >
> > Above two virtio-net MQ macros are introduced since kernel v3.8.
> > For older kernel, we should not reference them directly, hence,
> > this patch introduced two wrapper macros, with proper values
> > being set depending on we support MQ or not.
> >
> > Fixes: 19d4d7ef2a21 ("vhost-user: enable multiple queue")
>
> Not sure about this fix line as a build error first appeared for me at
> b09b198bfb5c ("vhost-user: announce queue number in message")
Fixed
> > Reported-by: Gu YongjieX <yongjiex.gu@intel.com>
> > Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
> >
>
> Build restored on kernel 3.2 with this fixed applied.
> Tested-by: David Marchand <david.marchand@6wind.com>
Applied, thanks
@@ -93,6 +93,21 @@ struct vhost_virtqueue {
struct buf_vector buf_vec[BUF_VECTOR_MAX]; /**< for scatter RX. */
} __rte_cache_aligned;
+
+/*
+ * 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
+ #define VHOST_SUPPORTS_MQ (1ULL << VIRTIO_NET_F_MQ)
+#else
+ #define VHOST_MAX_QUEUE_PAIRS 1
+ #define VHOST_SUPPORTS_MQ 0
+#endif
+
/**
* Device structure contains all configuration information relating to the device.
*/
@@ -106,7 +121,7 @@ struct virtio_net {
char ifname[IF_NAME_SZ]; /**< Name of the tap device or socket path. */
uint32_t virt_qp_nb; /**< number of queue pair we have allocated */
void *priv; /**< private context */
- struct vhost_virtqueue *virtqueue[VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX]; /**< Contains all virtqueue information. */
+ struct vhost_virtqueue *virtqueue[VHOST_MAX_QUEUE_PAIRS * 2]; /**< Contains all virtqueue information. */
} __rte_cache_aligned;
/**
@@ -424,7 +424,7 @@ vserver_message_handler(int connfd, void *dat, int *remove)
break;
case VHOST_USER_GET_QUEUE_NUM:
- msg.payload.u64 = VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX;
+ msg.payload.u64 = VHOST_MAX_QUEUE_PAIRS;
msg.size = sizeof(msg.payload.u64);
send_vhost_message(connfd, &msg);
break;
@@ -74,7 +74,7 @@ static struct virtio_net_config_ll *ll_root;
#define VHOST_SUPPORTED_FEATURES ((1ULL << VIRTIO_NET_F_MRG_RXBUF) | \
(1ULL << VIRTIO_NET_F_CTRL_VQ) | \
(1ULL << VIRTIO_NET_F_CTRL_RX) | \
- (1ULL << VIRTIO_NET_F_MQ) | \
+ (VHOST_SUPPORTS_MQ) | \
(1ULL << VHOST_F_LOG_ALL) | \
(1ULL << VHOST_USER_F_PROTOCOL_FEATURES))
static uint64_t VHOST_FEATURES = VHOST_SUPPORTED_FEATURES;