net/virtio: fix build with 0 headroom

When using RTE_PKTMBUF_HEADROOM as 0, virito ethdev driver throws
compilation error
virtio_ethdev.c:1851:2: note: in expansion of macro ‘RTE_BUILD_BUG_ON’
RTE_BUILD_BUG_ON(RTE_PKTMBUF_HEADROOM
	< sizeof(struct virtio_net_hdr_mrg_rxbuf));

This patch change it into run-time check.

Bugzilla ID: 335
Fixes: dec08c28c0b3 ("virtio: check packet headroom at compile time")
Cc: stable@dpdk.org
Signed-off-by: Hemant Agrawal <hemant.agrawal@nxp.com>
Acked-by: Maxime Coquelin <maxime.coquelin@redhat.com>

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index 20840bf..f96588b 100644 (file)
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -1845,7 +1845,14 @@ eth_virtio_dev_init(struct rte_eth_dev *eth_dev)
        struct virtio_hw *hw = eth_dev->data->dev_private;
        int ret;
 
-       RTE_BUILD_BUG_ON(RTE_PKTMBUF_HEADROOM < sizeof(struct virtio_net_hdr_mrg_rxbuf));
+       if (sizeof(struct virtio_net_hdr_mrg_rxbuf) > RTE_PKTMBUF_HEADROOM) {
+               PMD_INIT_LOG(ERR,
+                       "Not sufficient headroom required = %d, avail = %d",
+                       (int)sizeof(struct virtio_net_hdr_mrg_rxbuf),
+                       RTE_PKTMBUF_HEADROOM);
+
+               return -1;
+       }
 
        eth_dev->dev_ops = &virtio_eth_dev_ops;