net/cxgbe: fix crash when accessing empty Tx mbuf list
Ensure packets are available before accessing the mbuf list in Tx burst function. Otherwise, just reclaim completed Tx descriptors and exit. Fixes: b1df19e43e1d ("net/cxgbe: fix prefetch for non-coalesced Tx packets") Cc: stable@dpdk.org Reported-by: Brian Poole <brian90013@gmail.com> Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
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@ -71,6 +71,9 @@ uint16_t cxgbe_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
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t4_os_lock(&txq->txq_lock);
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/* free up desc from already completed tx */
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reclaim_completed_tx(&txq->q);
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if (unlikely(!nb_pkts))
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goto out_unlock;
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rte_prefetch0(rte_pktmbuf_mtod(tx_pkts[0], volatile void *));
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while (total_sent < nb_pkts) {
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pkts_remain = nb_pkts - total_sent;
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@ -91,6 +94,7 @@ uint16_t cxgbe_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
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reclaim_completed_tx(&txq->q);
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}
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out_unlock:
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t4_os_unlock(&txq->txq_lock);
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return total_sent;
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}
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