Depending on HW revision readless communcation between host and device
may be unavailable.
In that case prevent PMD of seting up readless communication mechanism.
Signed-off-by: Alexander Matushevsky <matua at amazon.com>
Signed-off-by: Jakub Palider <jpa at semihalf.com>
Signed-off-by: Jan Medala <jan at semihalf.com>
---
drivers/net/ena/ena_ethdev.c | 12 +++++++++++-
drivers/net/ena/ena_ethdev.h | 2 ++
2 files changed, 13 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ena/ena_ethdev.c b/drivers/net/ena/ena_ethdev.c
index 62232a4..25637a6 100644
--- a/drivers/net/ena/ena_ethdev.c
+++ b/drivers/net/ena/ena_ethdev.c
@@ -338,7 +338,8 @@ static void ena_config_host_info(struct ena_com_dev
*ena_dev)
host_info->driver_version =
(DRV_MODULE_VER_MAJOR) |
(DRV_MODULE_VER_MINOR << ENA_ADMIN_HOST_INFO_MINOR_SHIFT) |
- (DRV_MODULE_VER_SUBMINOR <<
ENA_ADMIN_HOST_INFO_SUB_MINOR_SHIFT);
+ (DRV_MODULE_VER_SUBMINOR <<
+ ENA_ADMIN_HOST_INFO_SUB_MINOR_SHIFT);
rc = ena_com_set_host_attributes(ena_dev);
if (rc) {
@@ -1145,6 +1146,7 @@ static int ena_device_init(struct ena_com_dev *ena_dev,
struct ena_com_dev_get_features_ctx *get_feat_ctx)
{
int rc;
+ bool readless_supported;
/* Initialize mmio registers */
rc = ena_com_mmio_reg_read_request_init(ena_dev);
@@ -1153,6 +1155,14 @@ static int ena_device_init(struct ena_com_dev *ena_dev,
return rc;
}
+ /* The PCIe configuration space revision id indicate if mmio reg
+ * read is disabled.
+ */
+ readless_supported =
+ !(((struct rte_pci_device *)ena_dev->dmadev)->id.class_id
+ & ENA_MMIO_DISABLE_REG_READ);
+ ena_com_set_mmio_read_mode(ena_dev, readless_supported);
+
/* reset device */
rc = ena_com_dev_reset(ena_dev);
if (rc) {
diff --git a/drivers/net/ena/ena_ethdev.h b/drivers/net/ena/ena_ethdev.h
index ab9667f..61390a9 100644
--- a/drivers/net/ena/ena_ethdev.h
+++ b/drivers/net/ena/ena_ethdev.h
@@ -54,6 +54,8 @@
#define ENA_PKT_MAX_BUFS 17
+#define ENA_MMIO_DISABLE_REG_READ BIT(0)
+
#define ENA_CIRC_COUNT(head, tail, size)
\
(((uint16_t)((uint16_t)(head) - (uint16_t)(tail))) & ((size) - 1))
--
2.8.2
