diff mbox series

[v20,10/27] net/ixgbe: remove use of VLAs

Message ID 1738686124-16173-11-git-send-email-andremue@linux.microsoft.com (mailing list archive)
State Superseded
Delegated to: David Marchand
Headers
Series remove use of VLAs for Windows |

Checks

Context Check Description
ci/checkpatch success coding style OK

Commit Message

Andre Muezerie Feb. 4, 2025, 4:21 p.m. UTC 
From: Konstantin Ananyev <konstantin.ananyev@huawei.com>

1) ../drivers/net/ixgbe/ixgbe_ethdev.c:3556:46: warning:
    variable length array used [-Wvla]
2) ../drivers/net/ixgbe/ixgbe_ethdev.c:3739:23: warning:
    variable length array used [-Wvla]
3) ../drivers/net/ixgbe/ixgbe_rxtx_vec_common.h:17:24: warning:
    variable length array used [-Wvla]

For first two cases: in fact ixgbe_xstats_calc_num() always returns
constant value, so it should be safe to replace that function invocation
just with a macro that performs same calculations.

For case #3: reassemble_packets() is invoked only by
ixgbe_recv_scattered_burst_vec().
And in turn, ixgbe_recv_scattered_burst_vec() operates only on fixed
max amount of packets per call: RTE_IXGBE_MAX_RX_BURST.
So, it should be safe to replace VLA with fixed size array.

Signed-off-by: Konstantin Ananyev <konstantin.ananyev@huawei.com>
Acked-by: Anatoly Burakov <anatoly.burakov@intel.com>
---
 drivers/net/intel/ixgbe/ixgbe_ethdev.c | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/intel/ixgbe/ixgbe_ethdev.c b/drivers/net/intel/ixgbe/ixgbe_ethdev.c
index 5f18fbaad5..c79ecd6eec 100644
--- a/drivers/net/intel/ixgbe/ixgbe_ethdev.c
+++ b/drivers/net/intel/ixgbe/ixgbe_ethdev.c
@@ -3437,11 +3437,16 @@  ixgbe_dev_stats_reset(struct rte_eth_dev *dev)
 }
 
 /* This function calculates the number of xstats based on the current config */
+
+#define IXGBE_XSTATS_CALC_NUM	\
+	(IXGBE_NB_HW_STATS + IXGBE_NB_MACSEC_STATS + \
+	(IXGBE_NB_RXQ_PRIO_STATS * IXGBE_NB_RXQ_PRIO_VALUES) + \
+	(IXGBE_NB_TXQ_PRIO_STATS * IXGBE_NB_TXQ_PRIO_VALUES))
+
 static unsigned
-ixgbe_xstats_calc_num(void) {
-	return IXGBE_NB_HW_STATS + IXGBE_NB_MACSEC_STATS +
-		(IXGBE_NB_RXQ_PRIO_STATS * IXGBE_NB_RXQ_PRIO_VALUES) +
-		(IXGBE_NB_TXQ_PRIO_STATS * IXGBE_NB_TXQ_PRIO_VALUES);
+ixgbe_xstats_calc_num(void)
+{
+	return IXGBE_XSTATS_CALC_NUM;
 }
 
 static int ixgbe_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
@@ -3557,8 +3562,8 @@  static int ixgbe_dev_xstats_get_names_by_id(
 	}
 
 	uint16_t i;
-	uint16_t size = ixgbe_xstats_calc_num();
-	struct rte_eth_xstat_name xstats_names_copy[size];
+	struct rte_eth_xstat_name xstats_names_copy[IXGBE_XSTATS_CALC_NUM];
+	const uint16_t size = RTE_DIM(xstats_names_copy);
 
 	ixgbe_dev_xstats_get_names_by_id(dev, NULL, xstats_names_copy,
 			size);
@@ -3740,8 +3745,8 @@  ixgbe_dev_xstats_get_by_id(struct rte_eth_dev *dev, const uint64_t *ids,
 	}
 
 	uint16_t i;
-	uint16_t size = ixgbe_xstats_calc_num();
-	uint64_t values_copy[size];
+	uint64_t values_copy[IXGBE_XSTATS_CALC_NUM];
+	const uint16_t size = RTE_DIM(values_copy);
 
 	ixgbe_dev_xstats_get_by_id(dev, NULL, values_copy, size);