[dpdk-dev] [PATCH 2/2] igb: fix VF statistic wraparound handling macro

Harry van Haaren harry.van.haaren at intel.com
Mon Oct 12 18:45:33 CEST 2015


Fix a misinterpreatation of VF statistic macro in e1000/igb.

Signed-off-by: Harry van Haaren <harry.van.haaren at intel.com>
---
 drivers/net/e1000/igb_ethdev.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/e1000/igb_ethdev.c b/drivers/net/e1000/igb_ethdev.c
index 848ef6e..e4911fc 100644
--- a/drivers/net/e1000/igb_ethdev.c
+++ b/drivers/net/e1000/igb_ethdev.c
@@ -246,11 +246,10 @@ static void eth_igb_configure_msix_intr(struct rte_eth_dev *dev);
 #define UPDATE_VF_STAT(reg, last, cur)            \
 {                                                 \
 	u32 latest = E1000_READ_REG(hw, reg);     \
-	cur += latest - last;                     \
+	cur += (latest-last) & UINT_MAX;          \
 	last = latest;                            \
 }
 
-
 #define IGB_FC_PAUSE_TIME 0x0680
 #define IGB_LINK_UPDATE_CHECK_TIMEOUT  90  /* 9s */
 #define IGB_LINK_UPDATE_CHECK_INTERVAL 100 /* ms */
-- 
1.9.1



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