[RESEND,07/13] net/hns3: fix next-to-use overflow when using SVE xmit
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Commit Message
From: Chengwen Feng <fengchengwen@huawei.com>
If txq's next-to-use plus nb_pkts equal txq's nb_tx_desc when using
SVE xmit algorithm, the txq's next-to-use will equal nb_tx_desc after
the xmit, this does not cause Tx exceptions, but may affect other ops
that depend on this field, such as tx_descriptor_status.
This patch fixes it.
Fixes: f0c243a6cb6f ("net/hns3: support SVE Tx")
Cc: stable@dpdk.org
Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
Signed-off-by: Dongdong Liu <liudongdong3@huawei.com>
---
drivers/net/hns3/hns3_rxtx_vec_sve.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
@@ -464,14 +464,16 @@ hns3_xmit_fixed_burst_vec_sve(void *__restrict tx_queue,
return 0;
}
- if (txq->next_to_use + nb_pkts > txq->nb_tx_desc) {
+ if (txq->next_to_use + nb_pkts >= txq->nb_tx_desc) {
nb_tx = txq->nb_tx_desc - txq->next_to_use;
hns3_tx_fill_hw_ring_sve(txq, tx_pkts, nb_tx);
txq->next_to_use = 0;
}
- hns3_tx_fill_hw_ring_sve(txq, tx_pkts + nb_tx, nb_pkts - nb_tx);
- txq->next_to_use += nb_pkts - nb_tx;
+ if (nb_pkts > nb_tx) {
+ hns3_tx_fill_hw_ring_sve(txq, tx_pkts + nb_tx, nb_pkts - nb_tx);
+ txq->next_to_use += nb_pkts - nb_tx;
+ }
txq->tx_bd_ready -= nb_pkts;
hns3_write_txq_tail_reg(txq, nb_pkts);