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[dpdk-dev,v3,24/31] net/i40e/base: comment that udp port must be in Host order

Message ID 1481369093-102492-25-git-send-email-jingjing.wu@intel.com (mailing list archive)
State Accepted, archived
Delegated to: Ferruh Yigit
Headers show


Context Check Description
ci/checkpatch success coding style OK

Commit Message

Wu, Jingjing Dec. 10, 2016, 11:24 a.m. UTC
The firmware expects the Port number to be in Little Endian format, and
the i40e_aq_add_udp_tunnel command clearly expects the udp_port variable
to be in Host order, as it uses CPU_TO_LE16(). It was recently
discovered in the Linux driver that we were passing a Big Endian port
number, which was therefor not enabling the UDP tunnel correctly.

Signed-off-by: Jingjing Wu <jingjing.wu@intel.com>
 drivers/net/i40e/base/i40e_common.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
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diff --git a/drivers/net/i40e/base/i40e_common.c b/drivers/net/i40e/base/i40e_common.c
index 17b53ae..852cbf7 100644
--- a/drivers/net/i40e/base/i40e_common.c
+++ b/drivers/net/i40e/base/i40e_common.c
@@ -4419,11 +4419,15 @@  enum i40e_status_code i40e_aq_start_stop_dcbx(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.
 enum i40e_status_code i40e_aq_add_udp_tunnel(struct i40e_hw *hw,
 				u16 udp_port, u8 protocol_index,