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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Haiyang Zhang <haiyangz@microsoft.com>,
        "David S. Miller" <davem@davemloft.net>
Subject: [PATCH 4.14 016/165] hv_netvsc: Set tx_table to equal weight after subchannels open
Date:   Thu, 24 May 2018 11:37:02 +0200
Message-Id: <20180524093622.641047740@linuxfoundation.org>
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4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Haiyang Zhang <haiyangz@microsoft.com>

[ Commit a6fb6aa3cfa9047b62653dbcfc9bcde6e2272b41 upstream. ]

In some cases, like internal vSwitch, the host doesn't provide
send indirection table updates. This patch sets the table to be
equal weight after subchannels are all open. Otherwise, all workload
will be on one TX channel.

As tested, this patch has largely increased the throughput over
internal vSwitch.

Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/hyperv/rndis_filter.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/net/hyperv/rndis_filter.c
+++ b/drivers/net/hyperv/rndis_filter.c
@@ -1114,6 +1114,9 @@ void rndis_set_subchannel(struct work_st
 	netif_set_real_num_tx_queues(ndev, nvdev->num_chn);
 	netif_set_real_num_rx_queues(ndev, nvdev->num_chn);
 
+	for (i = 0; i < VRSS_SEND_TAB_SIZE; i++)
+		ndev_ctx->tx_table[i] = i % nvdev->num_chn;
+
 	rtnl_unlock();
 	return;