[PATCH v5 14/14] net/cnxk: fix mbuf fields in multi-seg Tx path

[Nithin Dabilpuram <ndabilpuram@marvell.com>]

From: Rahul Bhansali <rbhansali@marvell.com>

Currently in debug mode when a buffer is allocated in SW,
nb_segs will have invalid values as it didn't come from driver
Rx path. Hence reset mbuf next and nb_segs fields in multi-seg Tx path.

Fixes: 3626d5195d49 ("net/cnxk: add multi-segment Tx for CN10K")

Signed-off-by: Rahul Bhansali <rbhansali@marvell.com>
---
 drivers/net/cnxk/cn10k_tx.h |  2 ++
 drivers/net/cnxk/cn9k_tx.h  | 20 ++++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/drivers/net/cnxk/cn10k_tx.h b/drivers/net/cnxk/cn10k_tx.h
index 84d71d0818..cc480d24e8 100644
--- a/drivers/net/cnxk/cn10k_tx.h
+++ b/drivers/net/cnxk/cn10k_tx.h
@@ -1328,6 +1328,7 @@ cn10k_nix_prepare_mseg(struct cn10k_eth_txq *txq,
 	nb_segs = m->nb_segs - 1;
 	m_next = m->next;
 	m->next = NULL;
+	m->nb_segs = 1;
 	slist = &cmd[3 + off + 1];
 
 	cookie = RTE_MBUF_DIRECT(m) ? m : rte_mbuf_from_indirect(m);
@@ -1873,6 +1874,7 @@ cn10k_nix_prepare_mseg_vec_list(struct rte_mbuf *m, uint64_t *cmd,
 	nb_segs = m->nb_segs - 1;
 	m_next = m->next;
 	m->next = NULL;
+	m->nb_segs = 1;
 	m = m_next;
 	/* Fill mbuf segments */
 	do {
diff --git a/drivers/net/cnxk/cn9k_tx.h b/drivers/net/cnxk/cn9k_tx.h
index 3596651cc2..94acbe64fa 100644
--- a/drivers/net/cnxk/cn9k_tx.h
+++ b/drivers/net/cnxk/cn9k_tx.h
@@ -647,6 +647,10 @@ cn9k_nix_prepare_mseg(struct cn9k_eth_txq *txq,
 	rte_io_wmb();
 #else
 	RTE_SET_USED(cookie);
+#endif
+#ifdef RTE_ENABLE_ASSERT
+	m->next = NULL;
+	m->nb_segs = 1;
 #endif
 	m = m_next;
 	if (!m)
@@ -683,6 +687,9 @@ cn9k_nix_prepare_mseg(struct cn9k_eth_txq *txq,
 			sg_u = sg->u;
 			slist++;
 		}
+#ifdef RTE_ENABLE_ASSERT
+		m->next = NULL;
+#endif
 		m = m_next;
 	} while (nb_segs);
 
@@ -696,6 +703,9 @@ cn9k_nix_prepare_mseg(struct cn9k_eth_txq *txq,
 	segdw += (off >> 1) + 1 + !!(flags & NIX_TX_OFFLOAD_TSTAMP_F);
 	send_hdr->w0.sizem1 = segdw - 1;
 
+#ifdef RTE_ENABLE_ASSERT
+	rte_io_wmb();
+#endif
 	return segdw;
 }
 
@@ -912,6 +922,10 @@ cn9k_nix_prepare_mseg_vec_list(struct cn9k_eth_txq *txq,
 	RTE_SET_USED(cookie);
 #endif
 
+#ifdef RTE_ENABLE_ASSERT
+	m->next = NULL;
+	m->nb_segs = 1;
+#endif
 	m = m_next;
 	/* Fill mbuf segments */
 	do {
@@ -942,6 +956,9 @@ cn9k_nix_prepare_mseg_vec_list(struct cn9k_eth_txq *txq,
 			sg_u = sg->u;
 			slist++;
 		}
+#ifdef RTE_ENABLE_ASSERT
+		m->next = NULL;
+#endif
 		m = m_next;
 	} while (nb_segs);
 
@@ -957,6 +974,9 @@ cn9k_nix_prepare_mseg_vec_list(struct cn9k_eth_txq *txq,
 		 !!(flags & NIX_TX_OFFLOAD_TSTAMP_F);
 	send_hdr->w0.sizem1 = segdw - 1;
 
+#ifdef RTE_ENABLE_ASSERT
+	rte_io_wmb();
+#endif
 	return segdw;
 }
 
-- 
2.25.1