From: Shahed Shaikh <shahed.sha...@cavium.com>
This patch implement eth_dev_ops->rx_descriptor_status
callback.
Walk through receive completion ring to calculate receive
descriptors used by firmware and then provide the status of
offset accordingly.
Signed-off-by: Shahed Shaikh <shahed.sha...@cavium.com>
---
drivers/net/qede/qede_ethdev.c | 2 +
drivers/net/qede/qede_rxtx.c | 81 ++++++++++++++++++++++++++++++++++++++++
drivers/net/qede/qede_rxtx.h | 2 +
3 files changed, 85 insertions(+)
diff --git a/drivers/net/qede/qede_ethdev.c b/drivers/net/qede/qede_ethdev.c
index 259eb45..322400c 100644
--- a/drivers/net/qede/qede_ethdev.c
+++ b/drivers/net/qede/qede_ethdev.c
@@ -2300,6 +2300,7 @@ static int qede_set_mtu(struct rte_eth_dev *dev, uint16_t
mtu)
.dev_infos_get = qede_dev_info_get,
.rx_queue_setup = qede_rx_queue_setup,
.rx_queue_release = qede_rx_queue_release,
+ .rx_descriptor_status = qede_rx_descriptor_status,
.tx_queue_setup = qede_tx_queue_setup,
.tx_queue_release = qede_tx_queue_release,
.dev_start = qede_dev_start,
@@ -2341,6 +2342,7 @@ static int qede_set_mtu(struct rte_eth_dev *dev, uint16_t
mtu)
.dev_infos_get = qede_dev_info_get,
.rx_queue_setup = qede_rx_queue_setup,
.rx_queue_release = qede_rx_queue_release,
+ .rx_descriptor_status = qede_rx_descriptor_status,
.tx_queue_setup = qede_tx_queue_setup,
.tx_queue_release = qede_tx_queue_release,
.dev_start = qede_dev_start,
diff --git a/drivers/net/qede/qede_rxtx.c b/drivers/net/qede/qede_rxtx.c
index 675c0a0..8a4772f 100644
--- a/drivers/net/qede/qede_rxtx.c
+++ b/drivers/net/qede/qede_rxtx.c
@@ -2151,3 +2151,84 @@ static inline uint32_t
qede_rx_cqe_to_tunn_pkt_type(uint16_t flags)
{
return 0;
}
+
+
+/* this function does a fake walk through over completion queue
+ * to calculate number of BDs used by HW.
+ * At the end, it restores the state of completion queue.
+ */
+static uint16_t
+qede_parse_fp_cqe(struct qede_rx_queue *rxq)
+{
+ uint16_t hw_comp_cons, sw_comp_cons, bd_count = 0;
+ union eth_rx_cqe *cqe, *orig_cqe = NULL;
+
+ hw_comp_cons = rte_le_to_cpu_16(*rxq->hw_cons_ptr);
+ sw_comp_cons = ecore_chain_get_cons_idx(&rxq->rx_comp_ring);
+
+ if (hw_comp_cons == sw_comp_cons)
+ return 0;
+
+ /* Get the CQE from the completion ring */
+ cqe = (union eth_rx_cqe *)ecore_chain_consume(&rxq->rx_comp_ring);
+ orig_cqe = cqe;
+
+ while (sw_comp_cons != hw_comp_cons) {
+ switch (cqe->fast_path_regular.type) {
+ case ETH_RX_CQE_TYPE_REGULAR:
+ bd_count += cqe->fast_path_regular.bd_num;
+ break;
+ case ETH_RX_CQE_TYPE_TPA_END:
+ bd_count += cqe->fast_path_tpa_end.num_of_bds;
+ break;
+ default:
+ break;
+ }
+
+ cqe =
+ (union eth_rx_cqe *)ecore_chain_consume(&rxq->rx_comp_ring);
+ sw_comp_cons = ecore_chain_get_cons_idx(&rxq->rx_comp_ring);
+ }
+
+ /* revert comp_ring to original state */
+ ecore_chain_set_cons(&rxq->rx_comp_ring, sw_comp_cons, orig_cqe);
+
+ return bd_count;
+}
+
+int
+qede_rx_descriptor_status(void *p_rxq, uint16_t offset)
+{
+ uint16_t hw_bd_cons, sw_bd_cons, sw_bd_prod;
+ uint16_t produced, consumed;
+ struct qede_rx_queue *rxq = p_rxq;
+
+ if (offset > rxq->nb_rx_desc)
+ return -EINVAL;
+
+ sw_bd_cons = ecore_chain_get_cons_idx(&rxq->rx_bd_ring);
+ sw_bd_prod = ecore_chain_get_prod_idx(&rxq->rx_bd_ring);
+
+ /* find BDs used by HW from completion queue elements */
+ hw_bd_cons = sw_bd_cons + qede_parse_fp_cqe(rxq);
+
+ if (hw_bd_cons < sw_bd_cons)
+ /* wraparound case */
+ consumed = (0xffff - sw_bd_cons) + hw_bd_cons;
+ else
+ consumed = hw_bd_cons - sw_bd_cons;
+
+ if (offset <= consumed)
+ return RTE_ETH_RX_DESC_DONE;
+
+ if (sw_bd_prod < sw_bd_cons)
+ /* wraparound case */
+ produced = (0xffff - sw_bd_cons) + sw_bd_prod;
+ else
+ produced = sw_bd_prod - sw_bd_cons;
+
+ if (offset <= produced)
+ return RTE_ETH_RX_DESC_AVAIL;
+
+ return RTE_ETH_RX_DESC_UNAVAIL;
+}
diff --git a/drivers/net/qede/qede_rxtx.h b/drivers/net/qede/qede_rxtx.h
index 8bd8d1c..d3a41e9 100644
--- a/drivers/net/qede/qede_rxtx.h
+++ b/drivers/net/qede/qede_rxtx.h
@@ -276,6 +276,8 @@ uint16_t qede_rxtx_pkts_dummy(void *p_rxq,
void qede_stop_queues(struct rte_eth_dev *eth_dev);
int qede_calc_rx_buf_size(struct rte_eth_dev *dev, uint16_t mbufsz,
uint16_t max_frame_size);
+int
+qede_rx_descriptor_status(void *rxq, uint16_t offset);
/* Fastpath resource alloc/dealloc helpers */
int qede_alloc_fp_resc(struct qede_dev *qdev);
--
1.7.10.3
