[Intel-wired-lan] [next PATCH S72-V3 04/13] i40e: comment that udp_port must be in host byte order
Alice Michael
alice.michael at intel.com
Wed Jun 7 09:43:04 UTC 2017
From: Jacob Keller <jacob.e.keller at intel.com>
The firmware expects the port number passed when setting up
the UDP tunnel configuration to be in Little Endian format.
The i40e_aq_add_udp_tunnel command byte swaps the value from
host order to Little Endian.
Since commit fe0b0cd97b4f ("i40e: send correct port number to
AdminQ when enabling UDP tunnels") we've correctly
sent the value in host order.
Let's also add a comment to the function explaining that it must
be in host order, as the port numbers are commonly stored as Big
Endian values.
Signed-off-by: Jacob Keller <jacob.e.keller at intel.com>
---
drivers/net/ethernet/intel/i40e/i40e_common.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/intel/i40e/i40e_common.c b/drivers/net/ethernet/intel/i40e/i40e_common.c
index cbad4eb..8e082a9 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_common.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_common.c
@@ -3614,11 +3614,15 @@ i40e_status i40e_aq_get_cee_dcb_config(struct i40e_hw *hw,
/**
* i40e_aq_add_udp_tunnel
* @hw: pointer to the hw struct
- * @udp_port: the UDP port to add
+ * @udp_port: the UDP port to add in Host byte order
* @header_len: length of the tunneling header length in DWords
* @protocol_index: protocol index type
* @filter_index: pointer to filter index
* @cmd_details: pointer to command details structure or NULL
+ *
+ * Note: Firmware expects the udp_port value to be in Little Endian format,
+ * and this function will call cpu_to_le16 to convert from Host byte order to
+ * Little Endian order.
**/
i40e_status i40e_aq_add_udp_tunnel(struct i40e_hw *hw,
u16 udp_port, u8 protocol_index,
--
2.9.3
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