[PATCH 1/2] net/iavf: enable TSO offloading for tunnel cases

[peng1x.zhang@intel.com]

From: Peng Zhang <peng1x.zhang@intel.com>

Hardware limits that max buffer size per Tx descriptor should be (16K-1)B.
So when TSO enabled under unencrypt scenario, the mbuf data size may exceed
the limit and cause malicious behavior to the NIC.

This patch supports Tx descriptors for this kind of large buffer.

Signed-off-by: Peng Zhang <peng1x.zhang@intel.com>
---
 drivers/net/iavf/iavf_rxtx.c | 66 ++++++++++++++++++++++++++++++++----
 1 file changed, 60 insertions(+), 6 deletions(-)

diff --git a/drivers/net/iavf/iavf_rxtx.c b/drivers/net/iavf/iavf_rxtx.c
index dfd021889e..adec58e90a 100644
--- a/drivers/net/iavf/iavf_rxtx.c
+++ b/drivers/net/iavf/iavf_rxtx.c
@@ -2642,6 +2642,47 @@ iavf_ipsec_crypto_get_pkt_metadata(const struct iavf_tx_queue *txq,
 	return NULL;
 }
 
+/* HW requires that TX buffer size ranges from 1B up to (16K-1)B. */
+#define IAVF_MAX_DATA_PER_TXD \
+	(IAVF_TXD_QW1_TX_BUF_SZ_MASK >> IAVF_TXD_QW1_TX_BUF_SZ_SHIFT)
+
+static inline void
+iavf_fill_unencrypt_desc(volatile struct iavf_tx_desc *txd, struct rte_mbuf *m,
+			 volatile uint64_t desc_template, struct iavf_tx_entry *txe,
+			 volatile struct iavf_tx_desc *txr, struct iavf_tx_entry *txe_ring,
+			 int desc_idx_last)
+{
+		/* Setup TX Descriptor */
+		int desc_idx;
+		uint16_t slen = m->data_len;
+		uint64_t buf_dma_addr = rte_mbuf_data_iova(m);
+		struct iavf_tx_entry *txn = &txe_ring[txe->next_id];
+
+		while ((m->ol_flags & RTE_MBUF_F_TX_TCP_SEG) &&
+			unlikely(slen > IAVF_MAX_DATA_PER_TXD)) {
+			txd->buffer_addr = rte_cpu_to_le_64(buf_dma_addr);
+
+			txd->cmd_type_offset_bsz =
+			rte_cpu_to_le_64(IAVF_TX_DESC_DTYPE_DATA |
+			(uint64_t)IAVF_MAX_DATA_PER_TXD <<
+			IAVF_TXD_DATA_QW1_TX_BUF_SZ_SHIFT) | desc_template;
+
+			buf_dma_addr += IAVF_MAX_DATA_PER_TXD;
+			slen -= IAVF_MAX_DATA_PER_TXD;
+
+			txe->last_id = desc_idx_last;
+			desc_idx = txe->next_id;
+			txe = txn;
+			txd = &txr[desc_idx];
+			txn = &txe_ring[txe->next_id];
+		}
+
+		txd->buffer_addr = rte_cpu_to_le_64(buf_dma_addr);
+		txd->cmd_type_offset_bsz =
+			rte_cpu_to_le_64((uint64_t)slen << IAVF_TXD_DATA_QW1_TX_BUF_SZ_SHIFT) |
+				desc_template;
+}
+
 /* TX function */
 uint16_t
 iavf_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
@@ -2650,6 +2691,7 @@ iavf_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 	volatile struct iavf_tx_desc *txr = txq->tx_ring;
 	struct iavf_tx_entry *txe_ring = txq->sw_ring;
 	struct iavf_tx_entry *txe, *txn;
+	volatile struct iavf_tx_desc *txd;
 	struct rte_mbuf *mb, *mb_seg;
 	uint16_t desc_idx, desc_idx_last;
 	uint16_t idx;
@@ -2781,6 +2823,7 @@ iavf_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 			ddesc = (volatile struct iavf_tx_desc *)
 					&txr[desc_idx];
 
+			txd = &txr[desc_idx];
 			txn = &txe_ring[txe->next_id];
 			RTE_MBUF_PREFETCH_TO_FREE(txn->mbuf);
 
@@ -2788,10 +2831,16 @@ iavf_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 				rte_pktmbuf_free_seg(txe->mbuf);
 
 			txe->mbuf = mb_seg;
-			iavf_fill_data_desc(ddesc, mb_seg,
-					ddesc_template, tlen, ipseclen);
 
-			IAVF_DUMP_TX_DESC(txq, ddesc, desc_idx);
+			if (nb_desc_ipsec) {
+				iavf_fill_data_desc(ddesc, mb_seg,
+					ddesc_template, tlen, ipseclen);
+				IAVF_DUMP_TX_DESC(txq, ddesc, desc_idx);
+			} else {
+				iavf_fill_unencrypt_desc(txd, mb_seg,
+					ddesc_template, txe, txr, txe_ring, desc_idx_last);
+				IAVF_DUMP_TX_DESC(txq, txd, desc_idx);
+			}
 
 			txe->last_id = desc_idx_last;
 			desc_idx = txe->next_id;
@@ -2816,10 +2865,15 @@ iavf_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 			txq->nb_used = 0;
 		}
 
-		ddesc->cmd_type_offset_bsz |= rte_cpu_to_le_64(ddesc_cmd <<
+		if (nb_desc_ipsec) {
+			ddesc->cmd_type_offset_bsz |= rte_cpu_to_le_64(ddesc_cmd <<
 				IAVF_TXD_DATA_QW1_CMD_SHIFT);
-
-		IAVF_DUMP_TX_DESC(txq, ddesc, desc_idx - 1);
+			IAVF_DUMP_TX_DESC(txq, ddesc, desc_idx - 1);
+		} else {
+			txd->cmd_type_offset_bsz |= rte_cpu_to_le_64(ddesc_cmd <<
+				IAVF_TXD_DATA_QW1_CMD_SHIFT);
+			IAVF_DUMP_TX_DESC(txq, txd, desc_idx - 1);
+		}
 	}
 
 end_of_tx:
-- 
2.25.1