net/virtio: wait device ready during reset

According to virtio spec, the device MUST reset when 0 is written to
device_status, and present 0 in device_status once reset is done.

This patch waits status value to be 0 during reset operation, if
timeout in 3 seconds, log and continue.

Signed-off-by: Xueming Li <xuemingl@nvidia.com>
Acked-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>

diff --git a/drivers/net/virtio/virtio.c b/drivers/net/virtio/virtio.c
index 7e1e777..d9e642f 100644 (file)
--- a/drivers/net/virtio/virtio.c
+++ b/drivers/net/virtio/virtio.c
@@ -3,7 +3,10 @@
  * Copyright(c) 2020 Red Hat, Inc.
  */
 
+#include <unistd.h>
+
 #include "virtio.h"
+#include "virtio_logs.h"
 
 uint64_t
 virtio_negotiate_features(struct virtio_hw *hw, uint64_t host_features)
@@ -38,9 +41,17 @@ virtio_write_dev_config(struct virtio_hw *hw, size_t offset,
 void
 virtio_reset(struct virtio_hw *hw)
 {
+       uint32_t retry = 0;
+
        VIRTIO_OPS(hw)->set_status(hw, VIRTIO_CONFIG_STATUS_RESET);
-       /* flush status write */
-       VIRTIO_OPS(hw)->get_status(hw);
+       /* Flush status write and wait device ready max 3 seconds. */
+       while (VIRTIO_OPS(hw)->get_status(hw) != VIRTIO_CONFIG_STATUS_RESET) {
+               if (retry++ > 3000) {
+                       PMD_INIT_LOG(WARNING, "port %u device reset timeout", hw->port_id);
+                       break;
+               }
+               usleep(1000L);
+       }
 }
 
 void