[RFC,v1,1/4] net/i40e: enable direct re-arm mode
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Commit Message
For i40e driver, enable direct re-arm mode. This patch supports the
case of mapping Rx/Tx queues from the same single lcore.
Suggested-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
Signed-off-by: Feifei Wang <feifei.wang2@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
---
drivers/net/i40e/i40e_rxtx.h | 4 +
drivers/net/i40e/i40e_rxtx_vec_neon.c | 149 +++++++++++++++++++++++++-
2 files changed, 151 insertions(+), 2 deletions(-)
@@ -102,6 +102,8 @@ struct i40e_rx_queue {
uint16_t rxrearm_nb; /**< number of remaining to be re-armed */
uint16_t rxrearm_start; /**< the idx we start the re-arming from */
+ uint16_t direct_rxrearm_port; /** device TX port ID for direct re-arm mode */
+ uint16_t direct_rxrearm_queue; /** TX queue index for direct re-arm mode */
uint64_t mbuf_initializer; /**< value to init mbufs */
uint16_t port_id; /**< device port ID */
@@ -121,6 +123,8 @@ struct i40e_rx_queue {
uint16_t rx_using_sse; /**<flag indicate the usage of vPMD for rx */
uint8_t dcb_tc; /**< Traffic class of rx queue */
uint64_t offloads; /**< Rx offload flags of RTE_ETH_RX_OFFLOAD_* */
+ /**< 0 if direct re-arm mode disabled, 1 when enabled */
+ bool direct_rxrearm_enable;
const struct rte_memzone *mz;
};
@@ -77,6 +77,147 @@ i40e_rxq_rearm(struct i40e_rx_queue *rxq)
I40E_PCI_REG_WRITE_RELAXED(rxq->qrx_tail, rx_id);
}
+static inline void
+i40e_rxq_rearm_direct_single(struct i40e_rx_queue *rxq)
+{
+ struct rte_eth_dev *dev;
+ struct i40e_tx_queue *txq;
+ volatile union i40e_rx_desc *rxdp;
+ struct i40e_tx_entry *txep;
+ struct i40e_rx_entry *rxep;
+ uint16_t tx_port_id, tx_queue_id;
+ uint16_t rx_id;
+ struct rte_mbuf *mb0, *mb1, *m;
+ uint64x2_t dma_addr0, dma_addr1;
+ uint64x2_t zero = vdupq_n_u64(0);
+ uint64_t paddr;
+ uint16_t i, n;
+ uint16_t nb_rearm = 0;
+
+ rxdp = rxq->rx_ring + rxq->rxrearm_start;
+ rxep = &rxq->sw_ring[rxq->rxrearm_start];
+
+ tx_port_id = rxq->direct_rxrearm_port;
+ tx_queue_id = rxq->direct_rxrearm_queue;
+ dev = &rte_eth_devices[tx_port_id];
+ txq = dev->data->tx_queues[tx_queue_id];
+
+ /* tx_rs_thresh must be equal to
+ * RTE_I40E_RXQ_REARM_THRESH in
+ * direct re-arm mode due to
+ * tx_next_dd update based on the
+ * number of free buffers in the
+ * next time
+ */
+ n = RTE_I40E_RXQ_REARM_THRESH;
+
+ if (txq->nb_tx_free < txq->tx_free_thresh) {
+ /* check DD bits on threshold descriptor */
+ if ((txq->tx_ring[txq->tx_next_dd].cmd_type_offset_bsz &
+ rte_cpu_to_le_64(I40E_TXD_QW1_DTYPE_MASK)) !=
+ rte_cpu_to_le_64(I40E_TX_DESC_DTYPE_DESC_DONE)) {
+ goto mempool_bulk;
+ }
+
+ /* first buffer to free from S/W ring is at index
+ * tx_next_dd - (tx_rs_thresh-1)
+ */
+ txep = &txq->sw_ring[txq->tx_next_dd - (n - 1)];
+
+ if (txq->offloads & DEV_TX_OFFLOAD_MBUF_FAST_FREE) {
+ /* directly put mbufs from Tx to Rx,
+ * and initialize the mbufs in vector,
+ * process 2 mbufs in one loop
+ */
+ for (i = 0; i < n; i += 2, rxep += 2, txep += 2) {
+ rxep[0].mbuf = txep[0].mbuf;
+ rxep[1].mbuf = txep[1].mbuf;
+
+ /* Initialize rxdp descs */
+ mb0 = txep[0].mbuf;
+ mb1 = txep[1].mbuf;
+
+ paddr = mb0->buf_iova + RTE_PKTMBUF_HEADROOM;
+ dma_addr0 = vdupq_n_u64(paddr);
+ /* flush desc with pa dma_addr */
+ vst1q_u64((uint64_t *)&rxdp++->read, dma_addr0);
+
+ paddr = mb1->buf_iova + RTE_PKTMBUF_HEADROOM;
+ dma_addr1 = vdupq_n_u64(paddr);
+ /* flush desc with pa dma_addr */
+ vst1q_u64((uint64_t *)&rxdp++->read, dma_addr1);
+ }
+ } else {
+ for (i = 0; i < n; i++) {
+ m = rte_pktmbuf_prefree_seg(txep[i].mbuf);
+ if (m != NULL) {
+ rxep[i].mbuf = m;
+
+ /* Initialize rxdp descs */
+ paddr = m->buf_iova + RTE_PKTMBUF_HEADROOM;
+ dma_addr0 = vdupq_n_u64(paddr);
+ /* flush desc with pa dma_addr */
+ vst1q_u64((uint64_t *)&rxdp++->read, dma_addr0);
+ nb_rearm++;
+ }
+ }
+ n = nb_rearm;
+ }
+
+ /* update counters for Tx */
+ txq->nb_tx_free = (uint16_t)(txq->nb_tx_free + RTE_I40E_RXQ_REARM_THRESH);
+ txq->tx_next_dd = (uint16_t)(txq->tx_next_dd + RTE_I40E_RXQ_REARM_THRESH);
+ if (txq->tx_next_dd >= txq->nb_tx_desc)
+ txq->tx_next_dd = (uint16_t)(RTE_I40E_RXQ_REARM_THRESH - 1);
+ } else {
+mempool_bulk:
+ /* if TX did not free bufs into Rx sw-ring,
+ * get new bufs from mempool
+ */
+ if (unlikely(rte_mempool_get_bulk(rxq->mp, (void *)rxep, n) < 0)) {
+ if (rxq->rxrearm_nb + n >= rxq->nb_rx_desc) {
+ for (i = 0; i < RTE_I40E_DESCS_PER_LOOP; i++) {
+ rxep[i].mbuf = &rxq->fake_mbuf;
+ vst1q_u64((uint64_t *)&rxdp[i].read, zero);
+ }
+ }
+ rte_eth_devices[rxq->port_id].data->rx_mbuf_alloc_failed += n;
+ return;
+ }
+
+ /* Initialize the mbufs in vector, process 2 mbufs in one loop */
+ for (i = 0; i < n; i += 2, rxep += 2) {
+ mb0 = rxep[0].mbuf;
+ mb1 = rxep[1].mbuf;
+
+ paddr = mb0->buf_iova + RTE_PKTMBUF_HEADROOM;
+ dma_addr0 = vdupq_n_u64(paddr);
+ /* flush desc with pa dma_addr */
+ vst1q_u64((uint64_t *)&rxdp++->read, dma_addr0);
+
+ paddr = mb1->buf_iova + RTE_PKTMBUF_HEADROOM;
+ dma_addr1 = vdupq_n_u64(paddr);
+ /* flush desc with pa dma_addr */
+ vst1q_u64((uint64_t *)&rxdp++->read, dma_addr1);
+ }
+ }
+
+ /* Update the descriptor initializer index */
+ rxq->rxrearm_start += n;
+ rx_id = rxq->rxrearm_start - 1;
+
+ if (unlikely(rxq->rxrearm_start >= rxq->nb_rx_desc)) {
+ rxq->rxrearm_start = 0;
+ rx_id = rxq->nb_rx_desc - 1;
+ }
+
+ rxq->rxrearm_nb -= n;
+
+ rte_io_wmb();
+ /* Update the tail pointer on the NIC */
+ I40E_PCI_REG_WRITE_RELAXED(rxq->qrx_tail, rx_id);
+}
+
static inline void
desc_to_olflags_v(struct i40e_rx_queue *rxq, uint64x2_t descs[4],
struct rte_mbuf **rx_pkts)
@@ -244,8 +385,12 @@ _recv_raw_pkts_vec(struct i40e_rx_queue *__rte_restrict rxq,
/* See if we need to rearm the RX queue - gives the prefetch a bit
* of time to act
*/
- if (rxq->rxrearm_nb > RTE_I40E_RXQ_REARM_THRESH)
- i40e_rxq_rearm(rxq);
+ if (rxq->rxrearm_nb > RTE_I40E_RXQ_REARM_THRESH) {
+ if (rxq->direct_rxrearm_enable)
+ i40e_rxq_rearm_direct_single(rxq);
+ else
+ i40e_rxq_rearm(rxq);
+ }
/* Before we start moving massive data around, check to see if
* there is actually a packet available