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net/thunderx: avoid sq door bell write on zero packet

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Avoid sq door bell write on zero packet case to reduce additional
traffic on register bus.

Fixes: 1c421f18e0 ("net/thunderx: add single and multi-segment Tx")
Cc: stable@dpdk.org

Signed-off-by: Kiran Kumar <kkokkilagadda@caviumnetworks.com>
Acked-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
This commit is contained in:
Kiran Kumar 2018-07-11 13:54:36 +05:30 committed by Ferruh Yigit
parent 9726c51df0
commit 47636efe87
1 changed files with 14 additions and 10 deletions
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24
drivers/net/thunderx/nicvf_rxtx.c
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@ -162,12 +162,14 @@ nicvf_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
free_desc -= TX_DESC_PER_PKT;
}
sq->tail = tail;
sq->xmit_bufs += i;
rte_wmb();
if (likely(i)) {
sq->tail = tail;
sq->xmit_bufs += i;
rte_wmb();
/* Inform HW to xmit the packets */
nicvf_addr_write(sq->sq_door, i * TX_DESC_PER_PKT);
/* Inform HW to xmit the packets */
nicvf_addr_write(sq->sq_door, i * TX_DESC_PER_PKT);
}
return i;
}
@ -218,12 +220,14 @@ nicvf_xmit_pkts_multiseg(void *tx_queue, struct rte_mbuf **tx_pkts,
}
}
sq->tail = tail;
sq->xmit_bufs += used_bufs;
rte_wmb();
if (likely(used_desc)) {
sq->tail = tail;
sq->xmit_bufs += used_bufs;
rte_wmb();
/* Inform HW to xmit the packets */
nicvf_addr_write(sq->sq_door, used_desc);
/* Inform HW to xmit the packets */
nicvf_addr_write(sq->sq_door, used_desc);
}
return i;
}