net/hns3: fix next-to-use overflow in simple Tx
If txq's next-to-use plus nb_pkts equal txq's nb_tx_desc when using simple xmit algorithm, the txq's next-to-use will equal nb_tx_desc fter the xmit, this does not cause Tx exceptions, but may affect other ops that depend on this field, such as tx_descriptor_status. Fixes: 7ef933908f04 ("net/hns3: add simple Tx path") Cc: stable@dpdk.org Signed-off-by: Chengwen Feng <fengchengwen@huawei.com> Signed-off-by: Dongdong Liu <liudongdong3@huawei.com>
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@ -4126,14 +4126,16 @@ hns3_xmit_pkts_simple(void *tx_queue,
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}
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txq->tx_bd_ready -= nb_pkts;
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if (txq->next_to_use + nb_pkts > txq->nb_tx_desc) {
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if (txq->next_to_use + nb_pkts >= txq->nb_tx_desc) {
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nb_tx = txq->nb_tx_desc - txq->next_to_use;
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hns3_tx_fill_hw_ring(txq, tx_pkts, nb_tx);
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txq->next_to_use = 0;
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}
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hns3_tx_fill_hw_ring(txq, tx_pkts + nb_tx, nb_pkts - nb_tx);
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txq->next_to_use += nb_pkts - nb_tx;
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if (nb_pkts > nb_tx) {
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hns3_tx_fill_hw_ring(txq, tx_pkts + nb_tx, nb_pkts - nb_tx);
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txq->next_to_use += nb_pkts - nb_tx;
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}
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hns3_write_txq_tail_reg(txq, nb_pkts);
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