vmxnet3: use correct flag to indicate LRO feature

'Commit 45dac1d6ea04 ("vmxnet3: Changes for vmxnet3 adapter version 2
(fwd)")' introduced a flag "lro" in structure vmxnet3_adapter which is
used to indicate whether LRO is enabled or not. However, the patch
did not set the flag and hence it was never exercised.

So, when LRO is enabled, it resulted in poor TCP performance due to
delayed acks. This issue is seen with packets which are larger than
the mss getting a delayed ack rather than an immediate ack, thus
resulting in high latency.

This patch removes the lro flag and directly uses device features
against NETIF_F_LRO to check if lro is enabled.

Fixes: 45dac1d6ea04 ("vmxnet3: Changes for vmxnet3 adapter version 2 (fwd)")
Reported-by: Rachel Lunnon <rachel_lunnon@stormagic.com>
Signed-off-by: Ronak Doshi <doshir@vmware.com>
Acked-by: Shrikrishna Khare <skhare@vmware.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/vmxnet3/vmxnet3_drv.c b/drivers/net/vmxnet3/vmxnet3_drv.c
index b466a422b72d3dabdeec706abef5b3a346995ad6..e04937f44f33313eb3eebf3bc1ea598686965950 100644 (file)
--- a/drivers/net/vmxnet3/vmxnet3_drv.c
+++ b/drivers/net/vmxnet3/vmxnet3_drv.c
@@ -1473,7 +1473,8 @@ vmxnet3_rq_rx_complete(struct vmxnet3_rx_queue *rq,
                        vmxnet3_rx_csum(adapter, skb,
                                        (union Vmxnet3_GenericDesc *)rcd);
                        skb->protocol = eth_type_trans(skb, adapter->netdev);
-                       if (!rcd->tcp || !adapter->lro)
+                       if (!rcd->tcp ||
+                           !(adapter->netdev->features & NETIF_F_LRO))
                                goto not_lro;
 
                        if (segCnt != 0 && mss != 0) {

diff --git a/drivers/net/vmxnet3/vmxnet3_int.h b/drivers/net/vmxnet3/vmxnet3_int.h
index b94fdfd0b6f188236b461574148562be0ba6fd86..99387a4a20a8316767aa2018946d6fb305443b37 100644 (file)
--- a/drivers/net/vmxnet3/vmxnet3_int.h
+++ b/drivers/net/vmxnet3/vmxnet3_int.h
@@ -69,10 +69,10 @@
 /*
  * Version numbers
  */
-#define VMXNET3_DRIVER_VERSION_STRING   "1.4.12.0-k"
+#define VMXNET3_DRIVER_VERSION_STRING   "1.4.13.0-k"
 
 /* a 32-bit int, each byte encode a verion number in VMXNET3_DRIVER_VERSION */
-#define VMXNET3_DRIVER_VERSION_NUM      0x01040c00
+#define VMXNET3_DRIVER_VERSION_NUM      0x01040d00
 
 #if defined(CONFIG_PCI_MSI)
        /* RSS only makes sense if MSI-X is supported. */
@@ -343,7 +343,6 @@ struct vmxnet3_adapter {
        u8                              version;
 
        bool                            rxcsum;
-       bool                            lro;
 
 #ifdef VMXNET3_RSS
        struct UPT1_RSSConf             *rss_conf;