Message-Id: <1463140525-27338-5-git-send-email-vkuznets@redhat.com>
Date:	Fri, 13 May 2016 13:55:23 +0200
From:	Vitaly Kuznetsov <vkuznets@...hat.com>
To:	netdev@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	"K. Y. Srinivasan" <kys@...rosoft.com>,
	"Lino Sanfilippo" <LinoSanfilippo@....de>
Subject: [PATCH net-next v2 4/6] hv_netvsc: get rid of struct net_device pointer in struct netvsc_device

Simplify netvsvc pointer graph by getting rid of the redundant ndev
pointer. We can always get a pointer to struct net_device from somewhere
else.

Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
---
 drivers/net/hyperv/hyperv_net.h   |  5 +--
 drivers/net/hyperv/netvsc.c       | 36 +++++++---------
 drivers/net/hyperv/netvsc_drv.c   | 91 +++++++++++++++++++++++----------------
 drivers/net/hyperv/rndis_filter.c |  4 +-
 4 files changed, 72 insertions(+), 64 deletions(-)

diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
index 0f38743..c270c5a 100644
--- a/drivers/net/hyperv/hyperv_net.h
+++ b/drivers/net/hyperv/hyperv_net.h
@@ -173,7 +173,6 @@ struct rndis_device {
 
 /* Interface */
 struct rndis_message;
-struct netvsc_device;
 int netvsc_device_add(struct hv_device *device, void *additional_info);
 int netvsc_device_remove(struct hv_device *device);
 int netvsc_send(struct hv_device *device,
@@ -203,7 +202,7 @@ int rndis_filter_receive(struct hv_device *dev,
 int rndis_filter_set_packet_filter(struct rndis_device *dev, u32 new_filter);
 int rndis_filter_set_device_mac(struct hv_device *hdev, char *mac);
 
-void netvsc_switch_datapath(struct netvsc_device *nv_dev, bool vf);
+void netvsc_switch_datapath(struct net_device *nv_dev, bool vf);
 
 #define NVSP_INVALID_PROTOCOL_VERSION	((u32)0xFFFFFFFF)
 
@@ -711,8 +710,6 @@ struct netvsc_device {
 	struct nvsp_message revoke_packet;
 	/* unsigned char HwMacAddr[HW_MACADDR_LEN]; */
 
-	struct net_device *ndev;
-
 	struct vmbus_channel *chn_table[VRSS_CHANNEL_MAX];
 	u32 send_table[VRSS_SEND_TAB_SIZE];
 	u32 max_chn;
diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index 1cd01ad..96b3c32 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -37,12 +37,12 @@
  * Switch the data path from the synthetic interface to the VF
  * interface.
  */
-void netvsc_switch_datapath(struct netvsc_device *nv_dev, bool vf)
+void netvsc_switch_datapath(struct net_device *ndev, bool vf)
 {
-	struct nvsp_message *init_pkt = &nv_dev->channel_init_pkt;
-	struct net_device *ndev = nv_dev->ndev;
 	struct net_device_context *net_device_ctx = netdev_priv(ndev);
 	struct hv_device *dev = net_device_ctx->device_ctx;
+	struct netvsc_device *nv_dev = net_device_ctx->nvdev;
+	struct nvsp_message *init_pkt = &nv_dev->channel_init_pkt;
 
 	memset(init_pkt, 0, sizeof(struct nvsp_message));
 	init_pkt->hdr.msg_type = NVSP_MSG4_TYPE_SWITCH_DATA_PATH;
@@ -80,7 +80,6 @@ static struct netvsc_device *alloc_net_device(struct hv_device *device)
 	net_device->destroy = false;
 	atomic_set(&net_device->open_cnt, 0);
 	atomic_set(&net_device->vf_use_cnt, 0);
-	net_device->ndev = ndev;
 	net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT;
 	net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT;
 
@@ -263,7 +262,7 @@ static int netvsc_init_buf(struct hv_device *device)
 	net_device = get_outbound_net_device(device);
 	if (!net_device)
 		return -ENODEV;
-	ndev = net_device->ndev;
+	ndev = hv_get_drvdata(device);
 
 	node = cpu_to_node(device->channel->target_cpu);
 	net_device->recv_buf = vzalloc_node(net_device->recv_buf_size, node);
@@ -453,6 +452,7 @@ static int negotiate_nvsp_ver(struct hv_device *device,
 			      struct nvsp_message *init_packet,
 			      u32 nvsp_ver)
 {
+	struct net_device *ndev = hv_get_drvdata(device);
 	int ret;
 	unsigned long t;
 
@@ -486,8 +486,7 @@ static int negotiate_nvsp_ver(struct hv_device *device,
 	/* NVSPv2 or later: Send NDIS config */
 	memset(init_packet, 0, sizeof(struct nvsp_message));
 	init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG;
-	init_packet->msg.v2_msg.send_ndis_config.mtu = net_device->ndev->mtu +
-						       ETH_HLEN;
+	init_packet->msg.v2_msg.send_ndis_config.mtu = ndev->mtu + ETH_HLEN;
 	init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1;
 
 	if (nvsp_ver >= NVSP_PROTOCOL_VERSION_5)
@@ -507,7 +506,6 @@ static int netvsc_connect_vsp(struct hv_device *device)
 	struct netvsc_device *net_device;
 	struct nvsp_message *init_packet;
 	int ndis_version;
-	struct net_device *ndev;
 	u32 ver_list[] = { NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2,
 		NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5 };
 	int i, num_ver = 4; /* number of different NVSP versions */
@@ -515,7 +513,6 @@ static int netvsc_connect_vsp(struct hv_device *device)
 	net_device = get_outbound_net_device(device);
 	if (!net_device)
 		return -ENODEV;
-	ndev = net_device->ndev;
 
 	init_packet = &net_device->channel_init_pkt;
 
@@ -768,6 +765,7 @@ static u32 netvsc_copy_to_send_buf(struct netvsc_device *net_device,
 }
 
 static inline int netvsc_send_pkt(
+	struct hv_device *device,
 	struct hv_netvsc_packet *packet,
 	struct netvsc_device *net_device,
 	struct hv_page_buffer **pb,
@@ -776,7 +774,7 @@ static inline int netvsc_send_pkt(
 	struct nvsp_message nvmsg;
 	u16 q_idx = packet->q_idx;
 	struct vmbus_channel *out_channel = net_device->chn_table[q_idx];
-	struct net_device *ndev = net_device->ndev;
+	struct net_device *ndev = hv_get_drvdata(device);
 	u64 req_id;
 	int ret;
 	struct hv_page_buffer *pgbuf;
@@ -971,7 +969,8 @@ int netvsc_send(struct hv_device *device,
 	}
 
 	if (msd_send) {
-		m_ret = netvsc_send_pkt(msd_send, net_device, NULL, msd_skb);
+		m_ret = netvsc_send_pkt(device, msd_send, net_device,
+					NULL, msd_skb);
 
 		if (m_ret != 0) {
 			netvsc_free_send_slot(net_device,
@@ -982,7 +981,7 @@ int netvsc_send(struct hv_device *device,
 
 send_now:
 	if (cur_send)
-		ret = netvsc_send_pkt(cur_send, net_device, pb, skb);
+		ret = netvsc_send_pkt(device, cur_send, net_device, pb, skb);
 
 	if (ret != 0 && section_index != NETVSC_INVALID_INDEX)
 		netvsc_free_send_slot(net_device, section_index);
@@ -998,9 +997,7 @@ static void netvsc_send_recv_completion(struct hv_device *device,
 	struct nvsp_message recvcompMessage;
 	int retries = 0;
 	int ret;
-	struct net_device *ndev;
-
-	ndev = net_device->ndev;
+	struct net_device *ndev = hv_get_drvdata(device);
 
 	recvcompMessage.hdr.msg_type =
 				NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE;
@@ -1047,11 +1044,9 @@ static void netvsc_receive(struct netvsc_device *net_device,
 	u32 status = NVSP_STAT_SUCCESS;
 	int i;
 	int count = 0;
-	struct net_device *ndev;
+	struct net_device *ndev = hv_get_drvdata(device);
 	void *data;
 
-	ndev = net_device->ndev;
-
 	/*
 	 * All inbound packets other than send completion should be xfer page
 	 * packet
@@ -1107,14 +1102,13 @@ static void netvsc_send_table(struct hv_device *hdev,
 			      struct nvsp_message *nvmsg)
 {
 	struct netvsc_device *nvscdev;
-	struct net_device *ndev;
+	struct net_device *ndev = hv_get_drvdata(hdev);
 	int i;
 	u32 count, *tab;
 
 	nvscdev = get_outbound_net_device(hdev);
 	if (!nvscdev)
 		return;
-	ndev = nvscdev->ndev;
 
 	count = nvmsg->msg.v5_msg.send_table.count;
 	if (count != VRSS_SEND_TAB_SIZE) {
@@ -1173,7 +1167,7 @@ void netvsc_channel_cb(void *context)
 	net_device = get_inbound_net_device(device);
 	if (!net_device)
 		return;
-	ndev = net_device->ndev;
+	ndev = hv_get_drvdata(device);
 	buffer = get_per_channel_state(channel);
 
 	do {
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index a33a1c9..7325d69 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -67,18 +67,19 @@ static void do_set_multicast(struct work_struct *w)
 {
 	struct net_device_context *ndevctx =
 		container_of(w, struct net_device_context, work);
-	struct netvsc_device *nvdev;
+	struct hv_device *device_obj = ndevctx->device_ctx;
+	struct net_device *ndev = hv_get_drvdata(device_obj);
+	struct netvsc_device *nvdev = ndevctx->nvdev;
 	struct rndis_device *rdev;
 
-	nvdev = ndevctx->nvdev;
-	if (nvdev == NULL || nvdev->ndev == NULL)
+	if (!nvdev)
 		return;
 
 	rdev = nvdev->extension;
 	if (rdev == NULL)
 		return;
 
-	if (nvdev->ndev->flags & IFF_PROMISC)
+	if (ndev->flags & IFF_PROMISC)
 		rndis_filter_set_packet_filter(rdev,
 			NDIS_PACKET_TYPE_PROMISCUOUS);
 	else
@@ -1050,23 +1051,22 @@ static const struct net_device_ops device_ops = {
  */
 static void netvsc_link_change(struct work_struct *w)
 {
-	struct net_device_context *ndev_ctx;
-	struct net_device *net;
+	struct net_device_context *ndev_ctx =
+		container_of(w, struct net_device_context, dwork.work);
+	struct hv_device *device_obj = ndev_ctx->device_ctx;
+	struct net_device *net = hv_get_drvdata(device_obj);
 	struct netvsc_device *net_device;
 	struct rndis_device *rdev;
 	struct netvsc_reconfig *event = NULL;
 	bool notify = false, reschedule = false;
 	unsigned long flags, next_reconfig, delay;
 
-	ndev_ctx = container_of(w, struct net_device_context, dwork.work);
-
 	rtnl_lock();
 	if (ndev_ctx->start_remove)
 		goto out_unlock;
 
 	net_device = ndev_ctx->nvdev;
 	rdev = net_device->extension;
-	net = net_device->ndev;
 
 	next_reconfig = ndev_ctx->last_reconfig + LINKCHANGE_INT;
 	if (time_is_after_jiffies(next_reconfig)) {
@@ -1167,10 +1167,9 @@ static void netvsc_notify_peers(struct work_struct *wrk)
 	atomic_dec(&gwrk->netvsc_dev->vf_use_cnt);
 }
 
-static struct netvsc_device *get_netvsc_device(char *mac)
+static struct net_device *get_netvsc_net_device(char *mac)
 {
-	struct net_device *dev;
-	struct net_device_context *netvsc_ctx = NULL;
+	struct net_device *dev, *found = NULL;
 	int rtnl_locked;
 
 	rtnl_locked = rtnl_trylock();
@@ -1179,21 +1178,20 @@ static struct netvsc_device *get_netvsc_device(char *mac)
 		if (memcmp(dev->dev_addr, mac, ETH_ALEN) == 0) {
 			if (dev->netdev_ops != &device_ops)
 				continue;
-			netvsc_ctx = netdev_priv(dev);
+			found = dev;
 			break;
 		}
 	}
 	if (rtnl_locked)
 		rtnl_unlock();
 
-	if (netvsc_ctx == NULL)
-		return NULL;
-
-	return netvsc_ctx->nvdev;
+	return found;
 }
 
 static int netvsc_register_vf(struct net_device *vf_netdev)
 {
+	struct net_device *ndev;
+	struct net_device_context *net_device_ctx;
 	struct netvsc_device *netvsc_dev;
 	const struct ethtool_ops *eth_ops = vf_netdev->ethtool_ops;
 
@@ -1205,11 +1203,16 @@ static int netvsc_register_vf(struct net_device *vf_netdev)
 	 * associate with the VF interface. If we don't find a matching
 	 * synthetic interface, move on.
 	 */
-	netvsc_dev = get_netvsc_device(vf_netdev->dev_addr);
+	ndev = get_netvsc_net_device(vf_netdev->dev_addr);
+	if (!ndev)
+		return NOTIFY_DONE;
+
+	net_device_ctx = netdev_priv(ndev);
+	netvsc_dev = net_device_ctx->nvdev;
 	if (netvsc_dev == NULL)
 		return NOTIFY_DONE;
 
-	netdev_info(netvsc_dev->ndev, "VF registering: %s\n", vf_netdev->name);
+	netdev_info(ndev, "VF registering: %s\n", vf_netdev->name);
 	/*
 	 * Take a reference on the module.
 	 */
@@ -1221,6 +1224,7 @@ static int netvsc_register_vf(struct net_device *vf_netdev)
 
 static int netvsc_vf_up(struct net_device *vf_netdev)
 {
+	struct net_device *ndev;
 	struct netvsc_device *netvsc_dev;
 	const struct ethtool_ops *eth_ops = vf_netdev->ethtool_ops;
 	struct net_device_context *net_device_ctx;
@@ -1228,13 +1232,17 @@ static int netvsc_vf_up(struct net_device *vf_netdev)
 	if (eth_ops == &ethtool_ops)
 		return NOTIFY_DONE;
 
-	netvsc_dev = get_netvsc_device(vf_netdev->dev_addr);
+	ndev = get_netvsc_net_device(vf_netdev->dev_addr);
+	if (!ndev)
+		return NOTIFY_DONE;
+
+	net_device_ctx = netdev_priv(ndev);
+	netvsc_dev = net_device_ctx->nvdev;
 
 	if ((netvsc_dev == NULL) || (netvsc_dev->vf_netdev == NULL))
 		return NOTIFY_DONE;
 
-	netdev_info(netvsc_dev->ndev, "VF up: %s\n", vf_netdev->name);
-	net_device_ctx = netdev_priv(netvsc_dev->ndev);
+	netdev_info(ndev, "VF up: %s\n", vf_netdev->name);
 	netvsc_dev->vf_inject = true;
 
 	/*
@@ -1245,11 +1253,10 @@ static int netvsc_vf_up(struct net_device *vf_netdev)
 	/*
 	 * notify the host to switch the data path.
 	 */
-	netvsc_switch_datapath(netvsc_dev, true);
-	netdev_info(netvsc_dev->ndev, "Data path switched to VF: %s\n",
-		    vf_netdev->name);
+	netvsc_switch_datapath(ndev, true);
+	netdev_info(ndev, "Data path switched to VF: %s\n", vf_netdev->name);
 
-	netif_carrier_off(netvsc_dev->ndev);
+	netif_carrier_off(ndev);
 
 	/*
 	 * Now notify peers. We are scheduling work to
@@ -1267,6 +1274,7 @@ static int netvsc_vf_up(struct net_device *vf_netdev)
 
 static int netvsc_vf_down(struct net_device *vf_netdev)
 {
+	struct net_device *ndev;
 	struct netvsc_device *netvsc_dev;
 	struct net_device_context *net_device_ctx;
 	const struct ethtool_ops *eth_ops = vf_netdev->ethtool_ops;
@@ -1274,13 +1282,17 @@ static int netvsc_vf_down(struct net_device *vf_netdev)
 	if (eth_ops == &ethtool_ops)
 		return NOTIFY_DONE;
 
-	netvsc_dev = get_netvsc_device(vf_netdev->dev_addr);
+	ndev = get_netvsc_net_device(vf_netdev->dev_addr);
+	if (!ndev)
+		return NOTIFY_DONE;
+
+	net_device_ctx = netdev_priv(ndev);
+	netvsc_dev = net_device_ctx->nvdev;
 
 	if ((netvsc_dev == NULL) || (netvsc_dev->vf_netdev == NULL))
 		return NOTIFY_DONE;
 
-	netdev_info(netvsc_dev->ndev, "VF down: %s\n", vf_netdev->name);
-	net_device_ctx = netdev_priv(netvsc_dev->ndev);
+	netdev_info(ndev, "VF down: %s\n", vf_netdev->name);
 	netvsc_dev->vf_inject = false;
 	/*
 	 * Wait for currently active users to
@@ -1289,16 +1301,15 @@ static int netvsc_vf_down(struct net_device *vf_netdev)
 
 	while (atomic_read(&netvsc_dev->vf_use_cnt) != 0)
 		udelay(50);
-	netvsc_switch_datapath(netvsc_dev, false);
-	netdev_info(netvsc_dev->ndev, "Data path switched from VF: %s\n",
-		    vf_netdev->name);
+	netvsc_switch_datapath(ndev, false);
+	netdev_info(ndev, "Data path switched from VF: %s\n", vf_netdev->name);
 	rndis_filter_close(net_device_ctx->device_ctx);
-	netif_carrier_on(netvsc_dev->ndev);
+	netif_carrier_on(ndev);
 	/*
 	 * Notify peers.
 	 */
 	atomic_inc(&netvsc_dev->vf_use_cnt);
-	net_device_ctx->gwrk.netdev = netvsc_dev->ndev;
+	net_device_ctx->gwrk.netdev = ndev;
 	net_device_ctx->gwrk.netvsc_dev = netvsc_dev;
 	schedule_work(&net_device_ctx->gwrk.dwrk);
 
@@ -1308,17 +1319,23 @@ static int netvsc_vf_down(struct net_device *vf_netdev)
 
 static int netvsc_unregister_vf(struct net_device *vf_netdev)
 {
+	struct net_device *ndev;
 	struct netvsc_device *netvsc_dev;
 	const struct ethtool_ops *eth_ops = vf_netdev->ethtool_ops;
+	struct net_device_context *net_device_ctx;
 
 	if (eth_ops == &ethtool_ops)
 		return NOTIFY_DONE;
 
-	netvsc_dev = get_netvsc_device(vf_netdev->dev_addr);
+	ndev = get_netvsc_net_device(vf_netdev->dev_addr);
+	if (!ndev)
+		return NOTIFY_DONE;
+
+	net_device_ctx = netdev_priv(ndev);
+	netvsc_dev = net_device_ctx->nvdev;
 	if (netvsc_dev == NULL)
 		return NOTIFY_DONE;
-	netdev_info(netvsc_dev->ndev, "VF unregistering: %s\n",
-		    vf_netdev->name);
+	netdev_info(ndev, "VF unregistering: %s\n", vf_netdev->name);
 
 	netvsc_dev->vf_netdev = NULL;
 	module_put(THIS_MODULE);
diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c
index 6caba51..97c292b 100644
--- a/drivers/net/hyperv/rndis_filter.c
+++ b/drivers/net/hyperv/rndis_filter.c
@@ -1061,8 +1061,8 @@ int rndis_filter_device_add(struct hv_device *dev,
 	ret = rndis_filter_query_device(rndis_device,
 					RNDIS_OID_GEN_MAXIMUM_FRAME_SIZE,
 					&mtu, &size);
-	if (ret == 0 && size == sizeof(u32) && mtu < net_device->ndev->mtu)
-		net_device->ndev->mtu = mtu;
+	if (ret == 0 && size == sizeof(u32) && mtu < net->mtu)
+		net->mtu = mtu;
 
 	/* Get the mac address */
 	ret = rndis_filter_query_device_mac(rndis_device);
-- 
2.5.5

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