net/qede: support Rx descriptor status

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.shaikh@cavium.com>

diff --git a/drivers/net/qede/qede_ethdev.c b/drivers/net/qede/qede_ethdev.c
index 3e4cac7..9d4591e 100644 (file)
--- a/drivers/net/qede/qede_ethdev.c
+++ b/drivers/net/qede/qede_ethdev.c
@@ -2299,6 +2299,7 @@ static const struct eth_dev_ops qede_eth_dev_ops = {
        .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,
@@ -2340,6 +2341,7 @@ static const struct eth_dev_ops qede_eth_vf_dev_ops = {
        .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 (file)
--- a/drivers/net/qede/qede_rxtx.c
+++ b/drivers/net/qede/qede_rxtx.c
@@ -2151,3 +2151,84 @@ qede_rxtx_pkts_dummy(__rte_unused void *p_rxq,
 {
        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 (file)
--- a/drivers/net/qede/qede_rxtx.h
+++ b/drivers/net/qede/qede_rxtx.h
@@ -276,6 +276,8 @@ int qede_start_queues(struct rte_eth_dev *eth_dev);
 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);