[v7,4/4] net/ixgbe: use WC store to update doorbell register
Checks
Commit Message
Performance improvement: use a write combining store
instead of a regular mmio write to update queue tail
registers.
Signed-off-by: Radu Nicolau <radu.nicolau@intel.com>
---
drivers/net/ixgbe/base/ixgbe_osdep.h | 6 ++++++
drivers/net/ixgbe/ixgbe_rxtx.c | 4 ++--
drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c | 4 ++--
3 files changed, 10 insertions(+), 4 deletions(-)
@@ -105,6 +105,12 @@ static inline uint32_t ixgbe_read_addr(volatile void* addr)
#define IXGBE_PCI_REG_WRITE_RELAXED(reg, value) \
rte_write32_relaxed((rte_cpu_to_le_32(value)), reg)
+#define IXGBE_PCI_REG_WC_WRITE(reg, value) \
+ rte_write32_wc((rte_cpu_to_le_32(value)), reg)
+
+#define IXGBE_PCI_REG_WC_WRITE_RELAXED(reg, value) \
+ rte_write32_wc_relaxed((rte_cpu_to_le_32(value)), reg)
+
#define IXGBE_PCI_REG_ADDR(hw, reg) \
((volatile uint32_t *)((char *)(hw)->hw_addr + (reg)))
@@ -308,7 +308,7 @@ tx_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
/* update tail pointer */
rte_wmb();
- IXGBE_PCI_REG_WRITE_RELAXED(txq->tdt_reg_addr, txq->tx_tail);
+ IXGBE_PCI_REG_WC_WRITE_RELAXED(txq->tdt_reg_addr, txq->tx_tail);
return nb_pkts;
}
@@ -1918,7 +1918,7 @@ ixgbe_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
(unsigned) nb_rx);
rx_id = (uint16_t) ((rx_id == 0) ?
(rxq->nb_rx_desc - 1) : (rx_id - 1));
- IXGBE_PCI_REG_WRITE(rxq->rdt_reg_addr, rx_id);
+ IXGBE_PCI_REG_WC_WRITE(rxq->rdt_reg_addr, rx_id);
nb_hold = 0;
}
rxq->nb_rx_hold = nb_hold;
@@ -90,7 +90,7 @@ ixgbe_rxq_rearm(struct ixgbe_rx_queue *rxq)
(rxq->nb_rx_desc - 1) : (rxq->rxrearm_start - 1));
/* Update the tail pointer on the NIC */
- IXGBE_PCI_REG_WRITE(rxq->rdt_reg_addr, rx_id);
+ IXGBE_PCI_REG_WC_WRITE(rxq->rdt_reg_addr, rx_id);
}
#ifdef RTE_LIBRTE_SECURITY
@@ -697,7 +697,7 @@ ixgbe_xmit_fixed_burst_vec(void *tx_queue, struct rte_mbuf **tx_pkts,
txq->tx_tail = tx_id;
- IXGBE_PCI_REG_WRITE(txq->tdt_reg_addr, txq->tx_tail);
+ IXGBE_PCI_REG_WC_WRITE(txq->tdt_reg_addr, txq->tx_tail);
return nb_pkts;
}