mlx5: support HW packet padding

[dpdk.git] / drivers / net / mlx5 / mlx5.c

diff --git a/drivers/net/mlx5/mlx5.c b/drivers/net/mlx5/mlx5.c
index 02ff362..5dc9f26 100644 (file)
--- a/drivers/net/mlx5/mlx5.c
+++ b/drivers/net/mlx5/mlx5.c
@@ -67,6 +67,25 @@
 #include "mlx5_autoconf.h"
 #include "mlx5_defs.h"
 
+/**
+ * Retrieve integer value from environment variable.
+ *
+ * @param[in] name
+ *   Environment variable name.
+ *
+ * @return
+ *   Integer value, 0 if the variable is not set.
+ */
+int
+mlx5_getenv_int(const char *name)
+{
+       const char *val = getenv(name);
+
+       if (val == NULL)
+               return 0;
+       return atoi(val);
+}
+
 /**
  * DPDK callback to close the device.
  *
@@ -333,6 +352,9 @@ mlx5_pci_devinit(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
 #ifdef HAVE_EXP_DEVICE_ATTR_VLAN_OFFLOADS
                        IBV_EXP_DEVICE_ATTR_VLAN_OFFLOADS |
 #endif /* HAVE_EXP_DEVICE_ATTR_VLAN_OFFLOADS */
+#ifdef HAVE_VERBS_RX_END_PADDING
+                       IBV_EXP_DEVICE_ATTR_RX_PAD_END_ALIGN |
+#endif /* HAVE_VERBS_RX_END_PADDING */
                        0;
 #endif /* HAVE_EXP_QUERY_DEVICE */
 
@@ -425,6 +447,12 @@ mlx5_pci_devinit(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
                DEBUG("FCS stripping configuration is %ssupported",
                      (priv->hw_fcs_strip ? "" : "not "));
 
+#ifdef HAVE_VERBS_RX_END_PADDING
+               priv->hw_padding = !!exp_device_attr.rx_pad_end_addr_align;
+#endif /* HAVE_VERBS_RX_END_PADDING */
+               DEBUG("hardware RX end alignment padding is %ssupported",
+                     (priv->hw_padding ? "" : "not "));
+
 #else /* HAVE_EXP_QUERY_DEVICE */
                priv->ind_table_max_size = RSS_INDIRECTION_TABLE_SIZE;
 #endif /* HAVE_EXP_QUERY_DEVICE */