[PATCH v6 2/2] examples/vhost: unconfigure DMA vchannel

[xuan . ding]

From: Xuan Ding <xuan.d...@intel.com>

This patch applies rte_vhost_async_dma_unconfigure() to manually free
DMA vchannels. Before unconfiguration, make sure the specified DMA
device is no longer used by any vhost ports.

Signed-off-by: Xuan Ding <xuan.d...@intel.com>
---
 examples/vhost/main.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/examples/vhost/main.c b/examples/vhost/main.c
index ac78704d79..42e53a0f9a 100644
--- a/examples/vhost/main.c
+++ b/examples/vhost/main.c
@@ -2066,6 +2066,14 @@ main(int argc, char *argv[])
        RTE_LCORE_FOREACH_WORKER(lcore_id)
                rte_eal_wait_lcore(lcore_id);
 
+       for (i = 0; i < dma_count; i++) {
+               if (rte_vhost_async_dma_unconfigure(dmas_id[i], 0) < 0) {
+                       RTE_LOG(ERR, VHOST_PORT,
+                               "Failed to unconfigure DMA %d in vhost.\n", 
dmas_id[i]);
+                       rte_exit(EXIT_FAILURE, "Cannot use given DMA device\n");
+               }
+       }
+
        /* clean up the EAL */
        rte_eal_cleanup();
 
-- 
2.17.1