From: Clark Wang <xiaoning.wang@xxxxxxx>
There is a situation where num_tx_rings cannot be divided by bdr_int_num.
For example, num_tx_rings is 8 and bdr_int_num is 3. According to the
previous logic, this results in two tx_bdr corresponding memories not
being allocated, so when sending packets to tx ring 6 or 7, wild pointers
will be accessed. Of course, this issue doesn't exist on LS1028A, because
its num_tx_rings is 8, and bdr_int_num is either 1 or 2. However, there
is a risk for the upcoming i.MX95. Therefore, it is necessary to ensure
that each tx_bdr can be allocated to the corresponding memory.
Signed-off-by: Clark Wang <xiaoning.wang@xxxxxxx>
Signed-off-by: Wei Fang <wei.fang@xxxxxxx>
---
v2 changes:
This patch is separated from v1 patch 9 ("net: enetc: optimize the
allocation of tx_bdr"). Only the optimized part is kept.
---
drivers/net/ethernet/freescale/enetc/enetc.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c
index d36af3f8ba31..72ddf8b16271 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc.c
@@ -3049,10 +3049,10 @@ static void enetc_int_vector_destroy(struct enetc_ndev_priv *priv, int i)
int enetc_alloc_msix(struct enetc_ndev_priv *priv)
{
struct pci_dev *pdev = priv->si->pdev;
+ int v_tx_rings, v_remainder;
int num_stack_tx_queues;
int first_xdp_tx_ring;
int i, n, err, nvec;
- int v_tx_rings;
nvec = ENETC_BDR_INT_BASE_IDX + priv->bdr_int_num;
/* allocate MSIX for both messaging and Rx/Tx interrupts */
@@ -3066,10 +3066,14 @@ int enetc_alloc_msix(struct enetc_ndev_priv *priv)
/* # of tx rings per int vector */
v_tx_rings = priv->num_tx_rings / priv->bdr_int_num;
+ v_remainder = priv->num_tx_rings % priv->bdr_int_num;
- for (i = 0; i < priv->bdr_int_num; i++)
- if (enetc_int_vector_init(priv, i, v_tx_rings))
+ for (i = 0; i < priv->bdr_int_num; i++) {
+ int num_tx_rings = i < v_remainder ? v_tx_rings + 1 : v_tx_rings;
+
+ if (enetc_int_vector_init(priv, i, num_tx_rings))
goto fail;
+ }
num_stack_tx_queues = enetc_num_stack_tx_queues(priv);
--
2.34.1
