[v2,2/5] net/ice: use relaxed and remove duplicate barrier
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Commit Message
To guarantee the orderings of successive stores to CIO and MMIO memory,
a lighter weight rte_io_wmb [1] can be used instead of rte_wmb, and since
the ICE_PCI_REG_WRITE API already has an inclusive rte_io_wmb, this
explicit call can even be saved.
[1] http://git.dpdk.org/dpdk/tree/lib/librte_eal/common/include/generic/
rte_atomic.h#n98
Signed-off-by: Gavin Hu <gavin.hu@arm.com>
---
drivers/net/ice/ice_rxtx.c | 6 ------
1 file changed, 6 deletions(-)
Comments
> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Gavin Hu
> Sent: Monday, September 16, 2019 7:27 PM
> To: dev@dpdk.org
> Cc: nd@arm.com; thomas@monjalon.net; Richardson, Bruce
> <bruce.richardson@intel.com>; Liu, Yong <yong.liu@intel.com>; Wang, Yinan
> <yinan.wang@intel.com>; ajit.khaparde@broadcom.com;
> somnath.kotur@broadcom.com; Honnappa.Nagarahalli@arm.com;
> ruifeng.wang@arm.com; steve.capper@arm.com
> Subject: [dpdk-dev] [PATCH v2 2/5] net/ice: use relaxed and remove duplicate
> barrier
>
> To guarantee the orderings of successive stores to CIO and MMIO memory, a
> lighter weight rte_io_wmb [1] can be used instead of rte_wmb, and since the
> ICE_PCI_REG_WRITE API already has an inclusive rte_io_wmb, this explicit call
> can even be saved.
>
> [1] http://git.dpdk.org/dpdk/tree/lib/librte_eal/common/include/generic/
> rte_atomic.h#n98
>
> Signed-off-by: Gavin Hu <gavin.hu@arm.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>
@@ -363,8 +363,6 @@ ice_rx_queue_start(struct rte_eth_dev *dev, uint16_t rx_queue_id)
return -ENOMEM;
}
- rte_wmb();
-
/* Init the RX tail register. */
ICE_PCI_REG_WRITE(rxq->qrx_tail, rxq->nb_rx_desc - 1);
@@ -1212,7 +1210,6 @@ ice_rx_alloc_bufs(struct ice_rx_queue *rxq)
}
/* Update rx tail regsiter */
- rte_wmb();
ICE_PCI_REG_WRITE(rxq->qrx_tail, rxq->rx_free_trigger);
rxq->rx_free_trigger =
@@ -2132,8 +2129,6 @@ ice_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
ICE_TXD_QW1_CMD_S);
}
end_of_tx:
- rte_wmb();
-
/* update Tail register */
ICE_PCI_REG_WRITE(txq->qtx_tail, tx_id);
txq->tx_tail = tx_id;
@@ -2289,7 +2284,6 @@ tx_xmit_pkts(struct ice_tx_queue *txq,
txq->tx_tail = 0;
/* Update the tx tail register */
- rte_wmb();
ICE_PCI_REG_WRITE(txq->qtx_tail, txq->tx_tail);
return nb_pkts;