[PATCH 14/19] net/xsc: add ethdev Rx burst

["WanRenyong" <wanry@yunsilicon.com>]

Implement xsc PMD receive function.

Signed-off-by: WanRenyong <wanry@yunsilicon.com>
Signed-off-by: Xiaoxiong Zhang <zhangxx@yunsilicon.com>
---
 drivers/net/xsc/xsc_rxtx.c | 189 ++++++++++++++++++++++++++++++++++++-
 drivers/net/xsc/xsc_rxtx.h |   9 ++
 2 files changed, 197 insertions(+), 1 deletion(-)

diff --git a/drivers/net/xsc/xsc_rxtx.c b/drivers/net/xsc/xsc_rxtx.c
index 66b1511c6a..28360e62ff 100644
--- a/drivers/net/xsc/xsc_rxtx.c
+++ b/drivers/net/xsc/xsc_rxtx.c
@@ -7,11 +7,198 @@
 #include "xsc_dev.h"
 #include "xsc_ethdev.h"
 #include "xsc_rxtx.h"
+#include "xsc_utils.h"
+#include "xsc_ctrl.h"
+
+#define XSC_CQE_OWNER_MASK 0x1
+#define XSC_CQE_OWNER_HW   0x2
+#define XSC_CQE_OWNER_SW   0x4
+#define XSC_CQE_OWNER_ERR  0x8
+
+#define XSC_MAX_RX_BURST_MBUFS 64
+
+static __rte_always_inline int
+check_cqe_own(volatile struct xsc_cqe *cqe, const uint16_t cqe_n,
+	      const uint16_t ci)
+
+{
+	if (unlikely(((cqe->owner & XSC_CQE_OWNER_MASK) !=
+					((ci >> cqe_n) & XSC_CQE_OWNER_MASK))))
+		return XSC_CQE_OWNER_HW;
+
+	rte_io_rmb();
+	if (cqe->msg_len <= 0 && cqe->is_error)
+		return XSC_CQE_OWNER_ERR;
+
+	return XSC_CQE_OWNER_SW;
+}
+
+static inline void
+xsc_cq_to_mbuf(struct xsc_rxq_data *rxq, struct rte_mbuf *pkt,
+	       volatile struct xsc_cqe *cqe)
+{
+	uint32_t rss_hash_res = 0;
+	pkt->port = rxq->port_id;
+	if (rxq->rss_hash) {
+		rss_hash_res = rte_be_to_cpu_32(cqe->vni);
+		if (rss_hash_res) {
+			pkt->hash.rss = rss_hash_res;
+			pkt->ol_flags |= RTE_MBUF_F_RX_RSS_HASH;
+		}
+	}
+}
+
+static inline int
+xsc_rx_poll_len(struct xsc_rxq_data *rxq, volatile struct xsc_cqe *cqe)
+{
+	int len;
+
+	do {
+		len = 0;
+		int ret;
+
+		ret = check_cqe_own(cqe, rxq->cqe_n, rxq->cq_ci);
+		if (unlikely(ret != XSC_CQE_OWNER_SW)) {
+			if (unlikely(ret == XSC_CQE_OWNER_ERR)) {
+				/* TODO */
+				if (ret == XSC_CQE_OWNER_HW ||
+						ret == -1)
+					return 0;
+			} else {
+				return 0;
+			}
+		}
+
+		rxq->cq_ci += 1;
+		len = rte_le_to_cpu_32(cqe->msg_len);
+		return len;
+	} while (1);
+}
+
+static __rte_always_inline void
+xsc_pkt_info_sync(struct rte_mbuf *rep, struct rte_mbuf *seg)
+{
+	if (rep != NULL && seg != NULL) {
+		rep->data_len = seg->data_len;
+		rep->pkt_len = seg->pkt_len;
+		rep->data_off = seg->data_off;
+		rep->port = seg->port;
+	}
+}
 
 uint16_t
 xsc_rx_burst(void *dpdk_rxq, struct rte_mbuf **pkts, uint16_t pkts_n)
 {
-	return 0;
+	struct xsc_rxq_data *rxq = dpdk_rxq;
+	const uint32_t wqe_m = rxq->wqe_m;
+	const uint32_t cqe_m = rxq->cqe_m;
+	const uint32_t sge_n = rxq->sge_n;
+	struct rte_mbuf *pkt = NULL;
+	struct rte_mbuf *seg = NULL;
+	volatile struct xsc_cqe *cqe = &(*rxq->cqes)[rxq->cq_ci & cqe_m];
+	uint32_t nb_pkts = 0;
+	uint32_t rq_ci = rxq->rq_ci;
+	int len = 0;
+	uint32_t cq_ci_two = 0;
+	int read_cqe_num = 0;
+	int read_cqe_num_len = 0;
+	volatile struct xsc_cqe_u64 *cqe_u64 = NULL;
+	struct rte_mbuf *rep;
+
+	while (pkts_n) {
+		uint32_t idx = rq_ci & wqe_m;
+		volatile struct xsc_wqe_data_seg *wqe =
+			&((volatile struct xsc_wqe_data_seg *)rxq->wqes)[idx << sge_n];
+		seg = (*rxq->elts)[idx];
+		rte_prefetch0(cqe);
+		rte_prefetch0(wqe);
+
+		rep = rte_mbuf_raw_alloc(seg->pool);
+		if (unlikely(rep == NULL))
+			break;
+
+		if (!pkt) {
+			if (read_cqe_num) {
+				cqe = cqe + 1;
+				len = read_cqe_num_len;
+				read_cqe_num = 0;
+			} else if ((rxq->cq_ci % 2 == 0) && (pkts_n > 1)) {
+				cq_ci_two = (rxq->cq_ci & rxq->cqe_m) / 2;
+				cqe_u64 = &(*rxq->cqes_u64)[cq_ci_two];
+				cqe = (volatile struct xsc_cqe *)cqe_u64;
+				len = xsc_rx_poll_len(rxq, cqe);
+				if (len > 0) {
+					read_cqe_num_len = xsc_rx_poll_len(rxq, cqe + 1);
+					if (read_cqe_num_len > 0)
+						read_cqe_num = 1;
+				}
+			} else {
+				cqe = &(*rxq->cqes)[rxq->cq_ci & rxq->cqe_m];
+				len = xsc_rx_poll_len(rxq, cqe);
+			}
+
+			if (!len) {
+				rte_mbuf_raw_free(rep);
+				break;
+			}
+
+			if (len > rte_pktmbuf_data_len(seg)) {
+				rte_mbuf_raw_free(rep);
+				pkt = NULL;
+				++rq_ci;
+				continue;
+			}
+
+			pkt = seg;
+			pkt->ol_flags &= RTE_MBUF_F_EXTERNAL;
+			xsc_cq_to_mbuf(rxq, pkt, cqe);
+
+			if (rxq->crc_present)
+				len -= RTE_ETHER_CRC_LEN;
+			rte_pktmbuf_pkt_len(pkt) = len;
+		}
+
+		xsc_pkt_info_sync(rep, seg);
+		(*rxq->elts)[idx] = rep;
+
+		/* Fill wqe */
+		wqe->va = rte_cpu_to_le_64(rte_pktmbuf_iova(rep));
+		rte_pktmbuf_data_len(seg) = len;
+
+		*(pkts++) = pkt;
+		pkt = NULL;
+		--pkts_n;
+		++nb_pkts;
+		++rq_ci;
+	}
+
+	if (unlikely(nb_pkts == 0 && rq_ci == rxq->rq_ci))
+		return 0;
+
+	rxq->rq_ci = rq_ci;
+	rxq->nb_rx_hold += nb_pkts;
+
+	if (rxq->nb_rx_hold >= rxq->rx_free_thresh) {
+		union xsc_cq_doorbell cq_db = {
+			.cq_data = 0
+		};
+		cq_db.next_cid = rxq->cq_ci;
+		cq_db.cq_num = rxq->cqn;
+
+		union xsc_recv_doorbell rq_db = {
+			.recv_data = 0
+		};
+		rq_db.next_pid = (rxq->rq_ci << sge_n);
+		rq_db.qp_num = rxq->qpn;
+
+		rte_io_wmb();
+		*rxq->cq_db = rte_cpu_to_le_32(cq_db.cq_data);
+		rte_io_wmb();
+		*rxq->rq_db = rte_cpu_to_le_32(rq_db.recv_data);
+		rxq->nb_rx_hold = 0;
+	}
+
+	return nb_pkts;
 }
 
 uint16_t
diff --git a/drivers/net/xsc/xsc_rxtx.h b/drivers/net/xsc/xsc_rxtx.h
index 0b2fded42b..454d5c0378 100644
--- a/drivers/net/xsc/xsc_rxtx.h
+++ b/drivers/net/xsc/xsc_rxtx.h
@@ -175,6 +175,15 @@ union xsc_recv_doorbell {
 	uint32_t recv_data;
 };
 
+union xsc_send_doorbell {
+	struct {
+		uint32_t next_pid : 16;
+		uint32_t qp_num : 15;
+		uint32_t rsv : 1;
+	};
+	uint32_t send_data;
+};
+
 uint16_t xsc_rx_burst(void *dpdk_rxq, struct rte_mbuf **pkts, uint16_t pkts_n);
 uint16_t xsc_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n);
 
-- 
2.25.1