[dpdk-dev] [PATCH 15/30] net/sfc: support Tx descriptor status in secondary process

[Andrew Rybchenko]

If Tx datapath supports multi-process, secondary process should be
able to use Tx descriptor status API.

Signed-off-by: Andrew Rybchenko <arybchenko at solarflare.com>
---
 doc/guides/rel_notes/release_19_05.rst |  1 +
 drivers/net/sfc/sfc_dp_tx.h            |  3 +++
 drivers/net/sfc/sfc_ethdev.c           | 11 +++++++++--
 drivers/net/sfc/sfc_tx.c               | 15 +++++++++++++++
 4 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/doc/guides/rel_notes/release_19_05.rst b/doc/guides/rel_notes/release_19_05.rst
index 93f28926a..6d65c8eae 100644
--- a/doc/guides/rel_notes/release_19_05.rst
+++ b/doc/guides/rel_notes/release_19_05.rst
@@ -60,6 +60,7 @@ New Features
 
   * Added support for Rx descriptor status and related API in a secondary
     process.
+  * Added support for Tx descriptor status API in a secondary process.
 
 
 Removed Items
diff --git a/drivers/net/sfc/sfc_dp_tx.h b/drivers/net/sfc/sfc_dp_tx.h
index c246871cd..fd492f21f 100644
--- a/drivers/net/sfc/sfc_dp_tx.h
+++ b/drivers/net/sfc/sfc_dp_tx.h
@@ -182,6 +182,9 @@ sfc_dp_find_tx_by_caps(struct sfc_dp_list *head, unsigned int avail_caps)
 	return (p == NULL) ? NULL : container_of(p, struct sfc_dp_tx, dp);
 }
 
+/** Get Tx datapath ops by the datapath TxQ handle */
+const struct sfc_dp_tx *sfc_dp_tx_by_dp_txq(const struct sfc_dp_txq *dp_txq);
+
 extern struct sfc_dp_tx sfc_efx_tx;
 extern struct sfc_dp_tx sfc_ef10_tx;
 extern struct sfc_dp_tx sfc_ef10_simple_tx;
diff --git a/drivers/net/sfc/sfc_ethdev.c b/drivers/net/sfc/sfc_ethdev.c
index 80a1d7a3d..c6e1e87ce 100644
--- a/drivers/net/sfc/sfc_ethdev.c
+++ b/drivers/net/sfc/sfc_ethdev.c
@@ -1167,13 +1167,19 @@ sfc_rx_descriptor_status(void *queue, uint16_t offset)
 	return dp_rx->qdesc_status(dp_rxq, offset);
 }
 
+/*
+ * The function is used by the secondary process as well. It must not
+ * use any process-local pointers from the adapter data.
+ */
 static int
 sfc_tx_descriptor_status(void *queue, uint16_t offset)
 {
 	struct sfc_dp_txq *dp_txq = queue;
-	struct sfc_txq *txq = sfc_txq_by_dp_txq(dp_txq);
+	const struct sfc_dp_tx *dp_tx;
+
+	dp_tx = sfc_dp_tx_by_dp_txq(dp_txq);
 
-	return txq->evq->sa->priv.dp_tx->qdesc_status(dp_txq, offset);
+	return dp_tx->qdesc_status(dp_txq, offset);
 }
 
 static int
@@ -1896,6 +1902,7 @@ static const struct eth_dev_ops sfc_eth_dev_secondary_ops = {
 	.rx_queue_count			= sfc_rx_queue_count,
 	.rx_descriptor_done		= sfc_rx_descriptor_done,
 	.rx_descriptor_status		= sfc_rx_descriptor_status,
+	.tx_descriptor_status		= sfc_tx_descriptor_status,
 	.rxq_info_get			= sfc_rx_queue_info_get,
 	.txq_info_get			= sfc_tx_queue_info_get,
 };
diff --git a/drivers/net/sfc/sfc_tx.c b/drivers/net/sfc/sfc_tx.c
index 1ee4e78a1..4357dbfd8 100644
--- a/drivers/net/sfc/sfc_tx.c
+++ b/drivers/net/sfc/sfc_tx.c
@@ -854,6 +854,21 @@ sfc_efx_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 	return pkts_sent;
 }
 
+const struct sfc_dp_tx *
+sfc_dp_tx_by_dp_txq(const struct sfc_dp_txq *dp_txq)
+{
+	const struct sfc_dp_queue *dpq = &dp_txq->dpq;
+	struct rte_eth_dev *eth_dev;
+	struct sfc_adapter_priv *sap;
+
+	SFC_ASSERT(rte_eth_dev_is_valid_port(dpq->port_id));
+	eth_dev = &rte_eth_devices[dpq->port_id];
+
+	sap = sfc_adapter_priv_by_eth_dev(eth_dev);
+
+	return sap->dp_tx;
+}
+
 struct sfc_txq_info *
 sfc_txq_info_by_dp_txq(const struct sfc_dp_txq *dp_txq)
 {
-- 
2.17.1