[dpdk-dev] [PATCH v4 4/6] vmxnet3: add tx l4 cksum offload

[Yong Wang]

Support TCP/UDP checksum offload.

Signed-off-by: Yong Wang <yongwang at vmware.com>
---
 doc/guides/rel_notes/release_2_3.rst |  3 +++
 drivers/net/vmxnet3/vmxnet3_rxtx.c   | 26 +++++++++++++++++++++++---
 2 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/doc/guides/rel_notes/release_2_3.rst 
b/doc/guides/rel_notes/release_2_3.rst
index a23c8ac..58205fe 100644
--- a/doc/guides/rel_notes/release_2_3.rst
+++ b/doc/guides/rel_notes/release_2_3.rst
@@ -20,6 +20,9 @@ Drivers
   Tx data ring has been shown to improve small pkt forwarding performance
   on vSphere environment.

+* **vmxnet3: add tx l4 cksum offload.**
+
+  Support TCP/UDP checksum offload.

 Libraries
 ~~~~~~~~~
diff --git a/drivers/net/vmxnet3/vmxnet3_rxtx.c 
b/drivers/net/vmxnet3/vmxnet3_rxtx.c
index f3af2f2..2c1bc3c 100644
--- a/drivers/net/vmxnet3/vmxnet3_rxtx.c
+++ b/drivers/net/vmxnet3/vmxnet3_rxtx.c
@@ -415,7 +415,27 @@ vmxnet3_xmit_pkts(void *tx_queue, struct rte_mbuf 
**tx_pkts,
                        gdesc->txd.tci = txm->vlan_tci;
                }

-               /* TODO: Add transmit checksum offload here */
+               if (txm->ol_flags & PKT_TX_L4_MASK) {
+                       gdesc->txd.om = VMXNET3_OM_CSUM;
+                       gdesc->txd.hlen = txm->l2_len + txm->l3_len;
+
+                       switch (txm->ol_flags & PKT_TX_L4_MASK) {
+                       case PKT_TX_TCP_CKSUM:
+                               gdesc->txd.msscof = gdesc->txd.hlen + 
offsetof(struct tcp_hdr, cksum);
+                               break;
+                       case PKT_TX_UDP_CKSUM:
+                               gdesc->txd.msscof = gdesc->txd.hlen + 
offsetof(struct udp_hdr, dgram_cksum);
+                               break;
+                       default:
+                               PMD_TX_LOG(WARNING, "requested cksum offload 
not supported %#llx",
+                                          txm->ol_flags & PKT_TX_L4_MASK);
+                               abort();
+                       }
+               } else {
+                       gdesc->txd.hlen = 0;
+                       gdesc->txd.om = VMXNET3_OM_NONE;
+                       gdesc->txd.msscof = 0;
+               }

                /* flip the GEN bit on the SOP */
                rte_compiler_barrier();
@@ -729,8 +749,8 @@ vmxnet3_dev_tx_queue_setup(struct rte_eth_dev *dev,
        PMD_INIT_FUNC_TRACE();

        if ((tx_conf->txq_flags & ETH_TXQ_FLAGS_NOXSUMS) !=
-           ETH_TXQ_FLAGS_NOXSUMS) {
-               PMD_INIT_LOG(ERR, "TX no support for checksum offload yet");
+           ETH_TXQ_FLAGS_NOXSUMSCTP) {
+               PMD_INIT_LOG(ERR, "SCTP checksum offload not supported");
                return -EINVAL;
        }

-- 
1.9.1