[dpdk-dev] [PATCH v3 5/5] ixgbe: support VxLAN & NVGRE TX checksum off-load

[Wenzhuo Lu]

The patch add VxLAN & NVGRE TX checksum off-load. When the flag of
outer IP header checksum offload is set, we'll set the context
descriptor to enable this checksum off-load.

Also update release note for VxLAN & NVGRE checksum off-load support.

Signed-off-by: Wenzhuo Lu <wenzhuo.lu at intel.com>
---
 doc/guides/rel_notes/release_2_3.rst |  8 ++++++++
 drivers/net/ixgbe/ixgbe_ethdev.c     |  4 ++++
 drivers/net/ixgbe/ixgbe_rxtx.c       | 18 ++++++++++++++++--
 drivers/net/ixgbe/ixgbe_rxtx.h       |  1 +
 4 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/doc/guides/rel_notes/release_2_3.rst b/doc/guides/rel_notes/release_2_3.rst
index 99de186..5dce7fb 100644
--- a/doc/guides/rel_notes/release_2_3.rst
+++ b/doc/guides/rel_notes/release_2_3.rst
@@ -4,6 +4,14 @@ DPDK Release 2.3
 New Features
 ------------
 
+* **Added support for VxLAN & NVGRE checksum off-load on X550.**
+
+  * Added support for VxLAN & NVGRE RX/TX checksum off-load on
+    X550. RX/TX checksum off-load is provided on both inner and
+    outer IP header and TCP header.
+  * Added functions to support VxLAN port configuration. The
+    default VxLAN port number is 4789 but this can be updated
+    programmatically.
 
 Resolved Issues
 ---------------
diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c
index fd9751e..3c3aa72 100644
--- a/drivers/net/ixgbe/ixgbe_ethdev.c
+++ b/drivers/net/ixgbe/ixgbe_ethdev.c
@@ -2811,6 +2811,10 @@ ixgbe_dev_info_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
 		DEV_TX_OFFLOAD_SCTP_CKSUM  |
 		DEV_TX_OFFLOAD_TCP_TSO;
 
+	if (hw->mac.type == ixgbe_mac_X550 ||
+	    hw->mac.type == ixgbe_mac_X550EM_x)
+		dev_info->tx_offload_capa |= DEV_TX_OFFLOAD_OUTER_IPV4_CKSUM;
+
 	dev_info->default_rxconf = (struct rte_eth_rxconf) {
 		.rx_thresh = {
 			.pthresh = IXGBE_DEFAULT_RX_PTHRESH,
diff --git a/drivers/net/ixgbe/ixgbe_rxtx.c b/drivers/net/ixgbe/ixgbe_rxtx.c
index 4ed9ddd..8eab768 100644
--- a/drivers/net/ixgbe/ixgbe_rxtx.c
+++ b/drivers/net/ixgbe/ixgbe_rxtx.c
@@ -85,7 +85,8 @@
 		PKT_TX_VLAN_PKT |		 \
 		PKT_TX_IP_CKSUM |		 \
 		PKT_TX_L4_MASK |		 \
-		PKT_TX_TCP_SEG)
+		PKT_TX_TCP_SEG |		 \
+		PKT_TX_OUTER_IP_CKSUM)
 
 static inline struct rte_mbuf *
 rte_rxmbuf_alloc(struct rte_mempool *mp)
@@ -364,6 +365,7 @@ ixgbe_set_xmit_ctx(struct ixgbe_tx_queue *txq,
 	uint32_t ctx_idx;
 	uint32_t vlan_macip_lens;
 	union ixgbe_tx_offload tx_offload_mask;
+	uint32_t seqnum_seed = 0;
 
 	ctx_idx = txq->ctx_curr;
 	tx_offload_mask.data = 0;
@@ -430,6 +432,15 @@ ixgbe_set_xmit_ctx(struct ixgbe_tx_queue *txq,
 		}
 	}
 
+	if (ol_flags & PKT_TX_OUTER_IP_CKSUM) {
+		tx_offload_mask.outer_l3_len |= ~0;
+		tx_offload_mask.l2_len |= ~0;
+		seqnum_seed |= tx_offload.outer_l3_len
+			       << IXGBE_ADVTXD_OUTER_IPLEN;
+		seqnum_seed |= tx_offload.l2_len
+			       << IXGBE_ADVTXD_TUNNEL_LEN;
+	}
+
 	txq->ctx_cache[ctx_idx].flags = ol_flags;
 	txq->ctx_cache[ctx_idx].tx_offload.data  =
 		tx_offload_mask.data & tx_offload.data;
@@ -441,7 +452,7 @@ ixgbe_set_xmit_ctx(struct ixgbe_tx_queue *txq,
 	vlan_macip_lens |= ((uint32_t)tx_offload.vlan_tci << IXGBE_ADVTXD_VLAN_SHIFT);
 	ctx_txd->vlan_macip_lens = rte_cpu_to_le_32(vlan_macip_lens);
 	ctx_txd->mss_l4len_idx   = rte_cpu_to_le_32(mss_l4len_idx);
-	ctx_txd->seqnum_seed     = 0;
+	ctx_txd->seqnum_seed     = seqnum_seed;
 }
 
 /*
@@ -492,6 +503,8 @@ tx_desc_ol_flags_to_cmdtype(uint64_t ol_flags)
 		cmdtype |= IXGBE_ADVTXD_DCMD_VLE;
 	if (ol_flags & PKT_TX_TCP_SEG)
 		cmdtype |= IXGBE_ADVTXD_DCMD_TSE;
+	if (ol_flags & PKT_TX_OUTER_IP_CKSUM)
+		cmdtype |= (1 << IXGBE_ADVTXD_OUTERIPCS_SHIFT);
 	return cmdtype;
 }
 
@@ -623,6 +636,7 @@ ixgbe_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
 			tx_offload.l4_len = tx_pkt->l4_len;
 			tx_offload.vlan_tci = tx_pkt->vlan_tci;
 			tx_offload.tso_segsz = tx_pkt->tso_segsz;
+			tx_offload.outer_l3_len = tx_pkt->outer_l3_len;
 
 			/* If new context need be built or reuse the exist ctx. */
 			ctx = what_advctx_update(txq, tx_ol_req,
diff --git a/drivers/net/ixgbe/ixgbe_rxtx.h b/drivers/net/ixgbe/ixgbe_rxtx.h
index 475a800..26ff35f 100644
--- a/drivers/net/ixgbe/ixgbe_rxtx.h
+++ b/drivers/net/ixgbe/ixgbe_rxtx.h
@@ -168,6 +168,7 @@ union ixgbe_tx_offload {
 		uint64_t l2_len:7; /**< L2 (MAC) Header Length. */
 		uint64_t l3_len:9; /**< L3 (IP) Header Length. */
 		uint64_t l4_len:8; /**< L4 (TCP/UDP) Header Length. */
+		uint64_t outer_l3_len:8; /**< Outer L3 (IP) Hdr Length. */
 		uint64_t tso_segsz:16; /**< TCP TSO segment size */
 		uint64_t vlan_tci:16;
 		/**< VLAN Tag Control Identifier (CPU order). */
-- 
1.9.3