From: Vitaly Kuznetsov <vkuznets@redhat.com>
To: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, devel@linuxdriverproject.org,
"K. Y. Srinivasan" <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Stephen Hemminger <sthemmin@microsoft.com>
Subject: [PATCH net-next 1/4] hv_netvsc: netvsc_teardown_gpadl() split
Date: Tue, 31 Oct 2017 14:42:01 +0100 [thread overview]
Message-ID: <20171031134204.15287-2-vkuznets@redhat.com> (raw)
In-Reply-To: <20171031134204.15287-1-vkuznets@redhat.com>
It was found that in some cases host refuses to teardown GPADL for send/
receive buffers (probably when some work with these buffere is scheduled or
ongoing). Change the teardown logic to be:
1) Send NVSP_MSG1_TYPE_REVOKE_* messages
2) Close the channel
3) Teardown GPADLs.
This seems to work reliably.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
drivers/net/hyperv/netvsc.c | 69 +++++++++++++++++++++++----------------------
1 file changed, 36 insertions(+), 33 deletions(-)
diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index 5bb6a20072dd..bfc79698b8f4 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -100,12 +100,11 @@ static void free_netvsc_device_rcu(struct netvsc_device *nvdev)
call_rcu(&nvdev->rcu, free_netvsc_device);
}
-static void netvsc_destroy_buf(struct hv_device *device)
+static void netvsc_revoke_buf(struct hv_device *device,
+ struct netvsc_device *net_device)
{
struct nvsp_message *revoke_packet;
struct net_device *ndev = hv_get_drvdata(device);
- struct net_device_context *ndc = netdev_priv(ndev);
- struct netvsc_device *net_device = rtnl_dereference(ndc->nvdev);
int ret;
/*
@@ -148,28 +147,6 @@ static void netvsc_destroy_buf(struct hv_device *device)
net_device->recv_section_cnt = 0;
}
- /* Teardown the gpadl on the vsp end */
- if (net_device->recv_buf_gpadl_handle) {
- ret = vmbus_teardown_gpadl(device->channel,
- net_device->recv_buf_gpadl_handle);
-
- /* If we failed here, we might as well return and have a leak
- * rather than continue and a bugchk
- */
- if (ret != 0) {
- netdev_err(ndev,
- "unable to teardown receive buffer's gpadl\n");
- return;
- }
- net_device->recv_buf_gpadl_handle = 0;
- }
-
- if (net_device->recv_buf) {
- /* Free up the receive buffer */
- vfree(net_device->recv_buf);
- net_device->recv_buf = NULL;
- }
-
/* Deal with the send buffer we may have setup.
* If we got a send section size, it means we received a
* NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE msg (ie sent
@@ -210,7 +187,35 @@ static void netvsc_destroy_buf(struct hv_device *device)
}
net_device->send_section_cnt = 0;
}
- /* Teardown the gpadl on the vsp end */
+}
+
+static void netvsc_teardown_gpadl(struct hv_device *device,
+ struct netvsc_device *net_device)
+{
+ struct net_device *ndev = hv_get_drvdata(device);
+ int ret;
+
+ if (net_device->recv_buf_gpadl_handle) {
+ ret = vmbus_teardown_gpadl(device->channel,
+ net_device->recv_buf_gpadl_handle);
+
+ /* If we failed here, we might as well return and have a leak
+ * rather than continue and a bugchk
+ */
+ if (ret != 0) {
+ netdev_err(ndev,
+ "unable to teardown receive buffer's gpadl\n");
+ return;
+ }
+ net_device->recv_buf_gpadl_handle = 0;
+ }
+
+ if (net_device->recv_buf) {
+ /* Free up the receive buffer */
+ vfree(net_device->recv_buf);
+ net_device->recv_buf = NULL;
+ }
+
if (net_device->send_buf_gpadl_handle) {
ret = vmbus_teardown_gpadl(device->channel,
net_device->send_buf_gpadl_handle);
@@ -420,7 +425,8 @@ static int netvsc_init_buf(struct hv_device *device,
goto exit;
cleanup:
- netvsc_destroy_buf(device);
+ netvsc_revoke_buf(device, net_device);
+ netvsc_teardown_gpadl(device, net_device);
exit:
return ret;
@@ -539,11 +545,6 @@ static int netvsc_connect_vsp(struct hv_device *device,
return ret;
}
-static void netvsc_disconnect_vsp(struct hv_device *device)
-{
- netvsc_destroy_buf(device);
-}
-
/*
* netvsc_device_remove - Callback when the root bus device is removed
*/
@@ -557,7 +558,7 @@ void netvsc_device_remove(struct hv_device *device)
cancel_work_sync(&net_device->subchan_work);
- netvsc_disconnect_vsp(device);
+ netvsc_revoke_buf(device, net_device);
RCU_INIT_POINTER(net_device_ctx->nvdev, NULL);
@@ -570,6 +571,8 @@ void netvsc_device_remove(struct hv_device *device)
/* Now, we can close the channel safely */
vmbus_close(device->channel);
+ netvsc_teardown_gpadl(device, net_device);
+
/* And dissassociate NAPI context from device */
for (i = 0; i < net_device->num_chn; i++)
netif_napi_del(&net_device->chan_table[i].napi);
--
2.13.6
next prev parent reply other threads:[~2017-10-31 13:43 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-31 13:42 [PATCH net-next 0/4] hv_netvsc: fix some crashes and hangs on channel/mtu changes Vitaly Kuznetsov
2017-10-31 13:42 ` Vitaly Kuznetsov [this message]
2017-10-31 16:37 ` [PATCH net-next 1/4] hv_netvsc: netvsc_teardown_gpadl() split Stephen Hemminger
2017-10-31 13:42 ` [PATCH net-next 2/4] hv_netvsc: protect nvdev->extension with RCU Vitaly Kuznetsov
2017-10-31 16:44 ` Stephen Hemminger
2017-10-31 17:13 ` Vitaly Kuznetsov
2017-11-02 10:27 ` Vitaly Kuznetsov
2017-10-31 13:42 ` [PATCH net-next 3/4] hv_netvsc: reset net_device_ctx->nvdev with rcu_assign_pointer() Vitaly Kuznetsov
2017-10-31 14:09 ` Eric Dumazet
2017-10-31 14:40 ` Vitaly Kuznetsov
2017-10-31 14:44 ` David Miller
2017-10-31 14:50 ` Vitaly Kuznetsov
2017-10-31 16:45 ` Stephen Hemminger
2017-10-31 13:42 ` [PATCH net-next 4/4] hv_netvsc: hide warnings about uninitialized/missing rndis device Vitaly Kuznetsov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20171031134204.15287-2-vkuznets@redhat.com \
--to=vkuznets@redhat.com \
--cc=devel@linuxdriverproject.org \
--cc=haiyangz@microsoft.com \
--cc=kys@microsoft.com \
--cc=linux-kernel@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=sthemmin@microsoft.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).