[Minios-devel] [UNIKRAFT PATCH 05/10] plat/xen/drivers/cons: Get Consfront info

[Birlea Costin <costin.birlea@xxxxxxxxx>]

Provides driver specific information to the API,
such as min/max number of descriptors for rx/tx.

Signed-off-by: Birlea Costin <costin.birlea@xxxxxxxxx>
---
 plat/xen/drivers/cons/consfront.c | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/plat/xen/drivers/cons/consfront.c 
b/plat/xen/drivers/cons/consfront.c
index 8c0980b6..33adabf7 100644
--- a/plat/xen/drivers/cons/consfront.c
+++ b/plat/xen/drivers/cons/consfront.c
@@ -49,12 +49,47 @@
 
 #define DRIVER_NAME           "xen-consfront"
 
+/* Xencons_interface in and out limits
+ * imposed by xen/io/console.h public header */
+#define XEN_CONSFRONT_SIZE_IN 1024
+#define XEN_CONSFRONT_SIZE_OUT 2048
+
 /* Get consfront_dev* which contains consdev */
 #define to_consfront(dev) \
                __containerof(dev, struct consfront_dev, consdev)
 
 static struct uk_alloc *drv_allocator;
 
+static void consfront_info_get(struct uk_consdev *dev __unused,
+               struct uk_consdev_info *dev_info)
+{
+       UK_ASSERT(dev_info);
+}
+
+static int consfront_rx_info_get(struct uk_consdev *dev __unused,
+               struct uk_consdev_ring_info *ring_info)
+{
+       UK_ASSERT(ring_info);
+
+       ring_info->nb_min = XEN_CONSFRONT_SIZE_IN;
+       ring_info->nb_max = XEN_CONSFRONT_SIZE_IN;
+       ring_info->nb_is_power_of_two = 0;
+
+       return 0;
+}
+
+static int consfront_tx_info_get(struct uk_consdev *dev __unused,
+               struct uk_consdev_ring_info *ring_info)
+{
+       UK_ASSERT(ring_info);
+
+       ring_info->nb_min = XEN_CONSFRONT_SIZE_OUT;
+       ring_info->nb_max = XEN_CONSFRONT_SIZE_OUT;
+       ring_info->nb_is_power_of_two = 0;
+
+       return 0;
+}
+
 static void consfront_close(struct uk_consdev *dev)
 {
        struct consfront_dev *cfdev;
@@ -72,6 +107,9 @@ static void consfront_close(struct uk_consdev *dev)
 }
 
 static const struct uk_consdev_ops consfront_ops = {
+       .info_get = consfront_info_get,
+       .rx_info_get = consfront_rx_info_get,
+       .tx_info_get = consfront_tx_info_get,
        .close = consfront_close,
 };
 
-- 
2.11.0


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