[dpdk-dev] [PATCH] fm10k: fix switch manager high CPU usage

[Shaopeng He <shaopeng.he@intel.com>]

fm10k switch core uses source MAC + VID + SGLORT to do
look up in MAC table. If no match, an exception interrupt
will be sent to the switch manager, and cause high CPU
usage.
This patch fixes this issue. A default SGLORT is assigned
to each TX queue. This default value works for non-VMDq mode
and current VMDq example. For advanced VMDq usage, e.g.
different source MAC address for different TX queue, FTAG
forwarding function could be used to change this default
SGLORT value.

Signed-off-by: Shaopeng He <shaopeng.he@intel.com>
---
 drivers/net/fm10k/fm10k_ethdev.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/fm10k/fm10k_ethdev.c b/drivers/net/fm10k/fm10k_ethdev.c
index e4aed94..f6eb05d 100644
--- a/drivers/net/fm10k/fm10k_ethdev.c
+++ b/drivers/net/fm10k/fm10k_ethdev.c
@@ -675,6 +675,9 @@ fm10k_dev_tx_init(struct rte_eth_dev *dev)
 		FM10K_WRITE_REG(hw, FM10K_TDBAH(i),
 				base_addr >> (CHAR_BIT * sizeof(uint32_t)));
 		FM10K_WRITE_REG(hw, FM10K_TDLEN(i), size);
+
+		/* assign default SGLORT for each TX queue */
+		FM10K_WRITE_REG(hw, FM10K_TX_SGLORT(i), hw->mac.dglort_map);
 	}
 
 	/* set up vector or scalar TX function as appropriate */
-- 
1.9.3