[PATCH net-next v2 6/9] net: use core MTU range checking in virt drivers

From: Jarod Wilson
Date: Thu Oct 20 2016 - 13:57:15 EST

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In reply to: Jarod Wilson: "[PATCH net-next v2 9/9] ipv4/6: use core net MTU range checking"
Next in thread: Haiyang Zhang: "RE: [PATCH net-next v2 6/9] net: use core MTU range checking in virt drivers"
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hyperv_net:
- set min/max_mtu, per Haiyang, after rndis_filter_device_add

virtio_net:
- set min/max_mtu
- remove virtnet_change_mtu

vmxnet3:
- set min/max_mtu

xen-netback:
- min_mtu = 0, max_mtu = 65517

xen-netfront:
- min_mtu = 0, max_mtu = 65535

unisys/visor:
- clean up defines a little to not clash with network core or add
redundat definitions

CC: netdev@xxxxxxxxxxxxxxx
CC: virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
CC: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>
CC: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
CC: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
CC: Shrikrishna Khare <skhare@xxxxxxxxxx>
CC: "VMware, Inc." <pv-drivers@xxxxxxxxxx>
CC: Wei Liu <wei.liu2@xxxxxxxxxx>
CC: Paul Durrant <paul.durrant@xxxxxxxxxx>
CC: David Kershner <david.kershner@xxxxxxxxxx>
Signed-off-by: Jarod Wilson <jarod@xxxxxxxxxx>
---
drivers/net/hyperv/hyperv_net.h | 4 ++--
drivers/net/hyperv/netvsc_drv.c | 14 +++++++-------
drivers/net/virtio_net.c | 23 ++++++++++-------------
drivers/net/vmxnet3/vmxnet3_drv.c | 7 ++++---
drivers/net/xen-netback/interface.c | 5 ++++-
drivers/net/xen-netfront.c | 2 ++
drivers/staging/unisys/include/iochannel.h | 10 ++++------
drivers/staging/unisys/visornic/visornic_main.c | 4 ++--
8 files changed, 35 insertions(+), 34 deletions(-)

diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
index f4fbcb5..3958ada 100644
--- a/drivers/net/hyperv/hyperv_net.h
+++ b/drivers/net/hyperv/hyperv_net.h
@@ -606,8 +606,8 @@ struct nvsp_message {
} __packed;

-#define NETVSC_MTU 65536
-#define NETVSC_MTU_MIN 68
+#define NETVSC_MTU 65535
+#define NETVSC_MTU_MIN ETH_MIN_MTU

#define NETVSC_RECEIVE_BUFFER_SIZE (1024*1024*16) /* 16MB */
#define NETVSC_RECEIVE_BUFFER_SIZE_LEGACY (1024*1024*15) /* 15MB */
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index f0919bd..3b28cf1 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -872,19 +872,12 @@ static int netvsc_change_mtu(struct net_device *ndev, int mtu)
struct netvsc_device *nvdev = ndevctx->nvdev;
struct hv_device *hdev = ndevctx->device_ctx;
struct netvsc_device_info device_info;
- int limit = ETH_DATA_LEN;
u32 num_chn;
int ret = 0;

if (ndevctx->start_remove || !nvdev || nvdev->destroy)
return -ENODEV;

- if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2)
- limit = NETVSC_MTU - ETH_HLEN;
-
- if (mtu < NETVSC_MTU_MIN || mtu > limit)
- return -EINVAL;
-
ret = netvsc_close(ndev);
if (ret)
goto out;
@@ -1402,6 +1395,13 @@ static int netvsc_probe(struct hv_device *dev,
netif_set_real_num_tx_queues(net, nvdev->num_chn);
netif_set_real_num_rx_queues(net, nvdev->num_chn);

+ /* MTU range: 68 - 1500 or 65521 */
+ net->min_mtu = NETVSC_MTU_MIN;
+ if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2)
+ net->max_mtu = NETVSC_MTU - ETH_HLEN;
+ else
+ net->max_mtu = ETH_DATA_LEN;
+
ret = register_netdev(net);
if (ret != 0) {
pr_err("Unable to register netdev.\n");
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index fad84f3..720809f 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -1419,17 +1419,6 @@ static const struct ethtool_ops virtnet_ethtool_ops = {
.set_settings = virtnet_set_settings,
};

-#define MIN_MTU 68
-#define MAX_MTU 65535
-
-static int virtnet_change_mtu(struct net_device *dev, int new_mtu)
-{
- if (new_mtu < MIN_MTU || new_mtu > MAX_MTU)
- return -EINVAL;
- dev->mtu = new_mtu;
- return 0;
-}
-
static const struct net_device_ops virtnet_netdev = {
.ndo_open = virtnet_open,
.ndo_stop = virtnet_close,
@@ -1437,7 +1426,6 @@ static const struct net_device_ops virtnet_netdev = {
.ndo_validate_addr = eth_validate_addr,
.ndo_set_mac_address = virtnet_set_mac_address,
.ndo_set_rx_mode = virtnet_set_rx_mode,
- .ndo_change_mtu = virtnet_change_mtu,
.ndo_get_stats64 = virtnet_stats,
.ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
.ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
@@ -1748,6 +1736,9 @@ static bool virtnet_validate_features(struct virtio_device *vdev)
return true;
}

+#define MIN_MTU ETH_MIN_MTU
+#define MAX_MTU ETH_MAX_MTU
+
static int virtnet_probe(struct virtio_device *vdev)
{
int i, err;
@@ -1821,6 +1812,10 @@ static int virtnet_probe(struct virtio_device *vdev)

dev->vlan_features = dev->features;

+ /* MTU range: 68 - 65535 */
+ dev->min_mtu = MIN_MTU;
+ dev->max_mtu = MAX_MTU;
+
/* Configuration may specify what MAC to use. Otherwise random. */
if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
virtio_cread_bytes(vdev,
@@ -1875,8 +1870,10 @@ static int virtnet_probe(struct virtio_device *vdev)
mtu = virtio_cread16(vdev,
offsetof(struct virtio_net_config,
mtu));
- if (virtnet_change_mtu(dev, mtu))
+ if (mtu < dev->min_mtu || mtu > dev->max_mtu)
__virtio_clear_bit(vdev, VIRTIO_NET_F_MTU);
+ else
+ dev->mtu = mtu;
}

if (vi->any_header_sg)
diff --git a/drivers/net/vmxnet3/vmxnet3_drv.c b/drivers/net/vmxnet3/vmxnet3_drv.c
index b5554f2..0c36de1 100644
--- a/drivers/net/vmxnet3/vmxnet3_drv.c
+++ b/drivers/net/vmxnet3/vmxnet3_drv.c
@@ -2969,9 +2969,6 @@ vmxnet3_change_mtu(struct net_device *netdev, int new_mtu)
struct vmxnet3_adapter *adapter = netdev_priv(netdev);
int err = 0;

- if (new_mtu < VMXNET3_MIN_MTU || new_mtu > VMXNET3_MAX_MTU)
- return -EINVAL;
-
netdev->mtu = new_mtu;

/*
@@ -3428,6 +3425,10 @@ vmxnet3_probe_device(struct pci_dev *pdev,
vmxnet3_set_ethtool_ops(netdev);
netdev->watchdog_timeo = 5 * HZ;

+ /* MTU range: 60 - 9000 */
+ netdev->min_mtu = VMXNET3_MIN_MTU;
+ netdev->max_mtu = VMXNET3_MAX_MTU;
+
INIT_WORK(&adapter->work, vmxnet3_reset_work);
set_bit(VMXNET3_STATE_BIT_QUIESCED, &adapter->state);

diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c
index 74dc2bf..e30ffd2 100644
--- a/drivers/net/xen-netback/interface.c
+++ b/drivers/net/xen-netback/interface.c
@@ -302,7 +302,7 @@ static int xenvif_close(struct net_device *dev)
static int xenvif_change_mtu(struct net_device *dev, int mtu)
{
struct xenvif *vif = netdev_priv(dev);
- int max = vif->can_sg ? 65535 - VLAN_ETH_HLEN : ETH_DATA_LEN;
+ int max = vif->can_sg ? ETH_MAX_MTU - VLAN_ETH_HLEN : ETH_DATA_LEN;

if (mtu > max)
return -EINVAL;
@@ -471,6 +471,9 @@ struct xenvif *xenvif_alloc(struct device *parent, domid_t domid,

dev->tx_queue_len = XENVIF_QUEUE_LENGTH;

+ dev->min_mtu = 0;
+ dev->max_mtu = ETH_MAX_MTU - VLAN_ETH_HLEN;
+
/*
* Initialise a dummy MAC address. We choose the numerically
* largest non-broadcast address to prevent the address getting
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index e17879d..7d616b0 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -1329,6 +1329,8 @@ static struct net_device *xennet_create_dev(struct xenbus_device *dev)
netdev->features |= netdev->hw_features;

netdev->ethtool_ops = &xennet_ethtool_ops;
+ netdev->min_mtu = 0;
+ netdev->max_mtu = XEN_NETIF_MAX_TX_SIZE;
SET_NETDEV_DEV(netdev, &dev->dev);

np->netdev = netdev;
diff --git a/drivers/staging/unisys/include/iochannel.h b/drivers/staging/unisys/include/iochannel.h
index cba4433..9081b3f 100644
--- a/drivers/staging/unisys/include/iochannel.h
+++ b/drivers/staging/unisys/include/iochannel.h
@@ -113,12 +113,10 @@ enum net_types {

};

-#define ETH_HEADER_SIZE 14 /* size of ethernet header */
-
#define ETH_MIN_DATA_SIZE 46 /* minimum eth data size */
-#define ETH_MIN_PACKET_SIZE (ETH_HEADER_SIZE + ETH_MIN_DATA_SIZE)
+#define ETH_MIN_PACKET_SIZE (ETH_HLEN + ETH_MIN_DATA_SIZE)

-#define ETH_MAX_MTU 16384 /* maximum data size */
+#define VISOR_ETH_MAX_MTU 16384 /* maximum data size */

#ifndef MAX_MACADDR_LEN
#define MAX_MACADDR_LEN 6 /* number of bytes in MAC address */
@@ -288,7 +286,7 @@ struct net_pkt_xmt {
int len; /* full length of data in the packet */
int num_frags; /* number of fragments in frags containing data */
struct phys_info frags[MAX_PHYS_INFO]; /* physical page information */
- char ethhdr[ETH_HEADER_SIZE]; /* the ethernet header */
+ char ethhdr[ETH_HLEN]; /* the ethernet header */
struct {
/* these are needed for csum at uisnic end */
u8 valid; /* 1 = struct is valid - else ignore */
@@ -323,7 +321,7 @@ struct net_pkt_xmtdone {
*/
#define RCVPOST_BUF_SIZE 4032
#define MAX_NET_RCV_CHAIN \
- ((ETH_MAX_MTU + ETH_HEADER_SIZE + RCVPOST_BUF_SIZE - 1) \
+ ((VISOR_ETH_MAX_MTU + ETH_HLEN + RCVPOST_BUF_SIZE - 1) \
/ RCVPOST_BUF_SIZE)

struct net_pkt_rcvpost {
diff --git a/drivers/staging/unisys/visornic/visornic_main.c b/drivers/staging/unisys/visornic/visornic_main.c
index 1367007..f8a584b 100644
--- a/drivers/staging/unisys/visornic/visornic_main.c
+++ b/drivers/staging/unisys/visornic/visornic_main.c
@@ -791,7 +791,7 @@ visornic_xmit(struct sk_buff *skb, struct net_device *netdev)
* pointing to
*/
firstfraglen = skb->len - skb->data_len;
- if (firstfraglen < ETH_HEADER_SIZE) {
+ if (firstfraglen < ETH_HLEN) {
spin_unlock_irqrestore(&devdata->priv_lock, flags);
devdata->busy_cnt++;
dev_err(&netdev->dev,
@@ -864,7 +864,7 @@ visornic_xmit(struct sk_buff *skb, struct net_device *netdev)
/* copy ethernet header from first frag into ocmdrsp
* - everything else will be pass in frags & DMA'ed
*/
- memcpy(cmdrsp->net.xmt.ethhdr, skb->data, ETH_HEADER_SIZE);
+ memcpy(cmdrsp->net.xmt.ethhdr, skb->data, ETH_HLEN);
/* copy frags info - from skb->data we need to only provide access
* beyond eth header
*/
--
2.10.0

Next message: Jarod Wilson: "[PATCH net-next v2 5/9] net: use core MTU range checking in core net infra"
Previous message: Krzysztof Kozlowski: "Re: [PATCH v2 1/3] mtd: s3c2410: make ecc mode configurable via platform data"
In reply to: Jarod Wilson: "[PATCH net-next v2 9/9] ipv4/6: use core net MTU range checking"
Next in thread: Haiyang Zhang: "RE: [PATCH net-next v2 6/9] net: use core MTU range checking in virt drivers"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]