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net/i40e: relax barrier in Tx

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To keep ordering of mixed accesses, rte_cio is sufficient.
The rte_io barrier inside the I40E_PCI_REG_WRITE is overkill.[1]

[1] http://inbox.dpdk.org/dev/CALBAE1M-ezVWCjqCZDBw+MMDEC4O9
qf0Kpn89EMdGDajepKoZQ@mail.gmail.com

Fixes: 4861cde461 ("i40e: new poll mode driver")
Cc: stable@dpdk.org

Signed-off-by: Gavin Hu <gavin.hu@arm.com>
Reviewed-by: Jerin Jacob <jerinj@marvell.com>
This commit is contained in:
Gavin Hu 2020-02-12 13:56:21 +08:00 committed by Ferruh Yigit
parent 496608a079
commit bade47a757
1 changed files with 2 additions and 1 deletions
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drivers/net/i40e/i40e_rxtx.c
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@ -1248,7 +1248,8 @@ i40e_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
(unsigned) txq->port_id, (unsigned) txq->queue_id,
(unsigned) tx_id, (unsigned) nb_tx);
I40E_PCI_REG_WRITE(txq->qtx_tail, tx_id);
rte_cio_wmb();
I40E_PCI_REG_WRITE_RELAXED(txq->qtx_tail, tx_id);
txq->tx_tail = tx_id;
return nb_tx;