From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752567AbaCIWSb (ORCPT ); Sun, 9 Mar 2014 18:18:31 -0400 Received: from p3plsmtps2ded04.prod.phx3.secureserver.net ([208.109.80.198]:55289 "EHLO p3plsmtps2ded04.prod.phx3.secureserver.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751201AbaCIWS3 (ORCPT ); Sun, 9 Mar 2014 18:18:29 -0400 x-originating-ip: 72.167.245.219 From: Haiyang Zhang To: davem@davemloft.net, netdev@vger.kernel.org Cc: haiyangz@microsoft.com, kys@microsoft.com, olaf@aepfle.de, jasowang@redhat.com, linux-kernel@vger.kernel.org, driverdev-devel@linuxdriverproject.org Subject: [PATCH net-next] hyperv: Change the receive buffer size for legacy hosts Date: Sun, 9 Mar 2014 16:10:59 -0700 Message-Id: <1394406659-22493-1-git-send-email-haiyangz@microsoft.com> X-Mailer: git-send-email 1.7.4.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Due to a bug in the Hyper-V host verion 2008R2, we need to use a slightly smaller receive buffer size, otherwise the buffer will not be accepted by the legacy hosts. Signed-off-by: Haiyang Zhang --- drivers/net/hyperv/hyperv_net.h | 1 + drivers/net/hyperv/netvsc.c | 6 +++++- 2 files changed, 6 insertions(+), 1 deletions(-) diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h index 39fc230..ea5f182 100644 --- a/drivers/net/hyperv/hyperv_net.h +++ b/drivers/net/hyperv/hyperv_net.h @@ -516,6 +516,7 @@ struct nvsp_message { #define NETVSC_MTU 65536 #define NETVSC_RECEIVE_BUFFER_SIZE (1024*1024*16) /* 16MB */ +#define NETVSC_RECEIVE_BUFFER_SIZE_LEGACY (1024*1024*15) /* 15MB */ #define NETVSC_RECEIVE_BUFFER_ID 0xcafe diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c index 1a0280d..daddea2 100644 --- a/drivers/net/hyperv/netvsc.c +++ b/drivers/net/hyperv/netvsc.c @@ -365,6 +365,11 @@ static int netvsc_connect_vsp(struct hv_device *device) goto cleanup; /* Post the big receive buffer to NetVSP */ + if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2) + net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY; + else + net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE; + ret = netvsc_init_recv_buf(device); cleanup: @@ -898,7 +903,6 @@ int netvsc_device_add(struct hv_device *device, void *additional_info) ndev = net_device->ndev; /* Initialize the NetVSC channel extension */ - net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE; spin_lock_init(&net_device->recv_pkt_list_lock); INIT_LIST_HEAD(&net_device->recv_pkt_list); -- 1.7.4.1