linux/drivers/net/hyperv/netvsc_drv.c
Haiyang Zhang aa0a34be68 hv_netvsc: Implement partial copy into send buffer
If remaining space in a send buffer slot is too small for the whole message,
we only copy the RNDIS header and PPI data into send buffer, so we can batch
one more packet each time. It reduces the vmbus per-message overhead.

Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Reviewed-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-04-14 14:57:10 -04:00

1010 lines
25 KiB
C

/*
* Copyright (c) 2009, Microsoft Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, see <http://www.gnu.org/licenses/>.
*
* Authors:
* Haiyang Zhang <haiyangz@microsoft.com>
* Hank Janssen <hjanssen@microsoft.com>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/init.h>
#include <linux/atomic.h>
#include <linux/module.h>
#include <linux/highmem.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/if_vlan.h>
#include <linux/in.h>
#include <linux/slab.h>
#include <net/arp.h>
#include <net/route.h>
#include <net/sock.h>
#include <net/pkt_sched.h>
#include "hyperv_net.h"
struct net_device_context {
/* point back to our device context */
struct hv_device *device_ctx;
struct delayed_work dwork;
struct work_struct work;
};
#define RING_SIZE_MIN 64
static int ring_size = 128;
module_param(ring_size, int, S_IRUGO);
MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)");
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 rndis_device *rdev;
nvdev = hv_get_drvdata(ndevctx->device_ctx);
if (nvdev == NULL || nvdev->ndev == NULL)
return;
rdev = nvdev->extension;
if (rdev == NULL)
return;
if (nvdev->ndev->flags & IFF_PROMISC)
rndis_filter_set_packet_filter(rdev,
NDIS_PACKET_TYPE_PROMISCUOUS);
else
rndis_filter_set_packet_filter(rdev,
NDIS_PACKET_TYPE_BROADCAST |
NDIS_PACKET_TYPE_ALL_MULTICAST |
NDIS_PACKET_TYPE_DIRECTED);
}
static void netvsc_set_multicast_list(struct net_device *net)
{
struct net_device_context *net_device_ctx = netdev_priv(net);
schedule_work(&net_device_ctx->work);
}
static int netvsc_open(struct net_device *net)
{
struct net_device_context *net_device_ctx = netdev_priv(net);
struct hv_device *device_obj = net_device_ctx->device_ctx;
struct netvsc_device *nvdev;
struct rndis_device *rdev;
int ret = 0;
netif_carrier_off(net);
/* Open up the device */
ret = rndis_filter_open(device_obj);
if (ret != 0) {
netdev_err(net, "unable to open device (ret %d).\n", ret);
return ret;
}
netif_tx_start_all_queues(net);
nvdev = hv_get_drvdata(device_obj);
rdev = nvdev->extension;
if (!rdev->link_state)
netif_carrier_on(net);
return ret;
}
static int netvsc_close(struct net_device *net)
{
struct net_device_context *net_device_ctx = netdev_priv(net);
struct hv_device *device_obj = net_device_ctx->device_ctx;
int ret;
netif_tx_disable(net);
/* Make sure netvsc_set_multicast_list doesn't re-enable filter! */
cancel_work_sync(&net_device_ctx->work);
ret = rndis_filter_close(device_obj);
if (ret != 0)
netdev_err(net, "unable to close device (ret %d).\n", ret);
return ret;
}
static void *init_ppi_data(struct rndis_message *msg, u32 ppi_size,
int pkt_type)
{
struct rndis_packet *rndis_pkt;
struct rndis_per_packet_info *ppi;
rndis_pkt = &msg->msg.pkt;
rndis_pkt->data_offset += ppi_size;
ppi = (struct rndis_per_packet_info *)((void *)rndis_pkt +
rndis_pkt->per_pkt_info_offset + rndis_pkt->per_pkt_info_len);
ppi->size = ppi_size;
ppi->type = pkt_type;
ppi->ppi_offset = sizeof(struct rndis_per_packet_info);
rndis_pkt->per_pkt_info_len += ppi_size;
return ppi;
}
union sub_key {
u64 k;
struct {
u8 pad[3];
u8 kb;
u32 ka;
};
};
/* Toeplitz hash function
* data: network byte order
* return: host byte order
*/
static u32 comp_hash(u8 *key, int klen, void *data, int dlen)
{
union sub_key subk;
int k_next = 4;
u8 dt;
int i, j;
u32 ret = 0;
subk.k = 0;
subk.ka = ntohl(*(u32 *)key);
for (i = 0; i < dlen; i++) {
subk.kb = key[k_next];
k_next = (k_next + 1) % klen;
dt = ((u8 *)data)[i];
for (j = 0; j < 8; j++) {
if (dt & 0x80)
ret ^= subk.ka;
dt <<= 1;
subk.k <<= 1;
}
}
return ret;
}
static bool netvsc_set_hash(u32 *hash, struct sk_buff *skb)
{
struct flow_keys flow;
int data_len;
if (!skb_flow_dissect(skb, &flow) ||
!(flow.n_proto == htons(ETH_P_IP) ||
flow.n_proto == htons(ETH_P_IPV6)))
return false;
if (flow.ip_proto == IPPROTO_TCP)
data_len = 12;
else
data_len = 8;
*hash = comp_hash(netvsc_hash_key, HASH_KEYLEN, &flow, data_len);
return true;
}
static u16 netvsc_select_queue(struct net_device *ndev, struct sk_buff *skb,
void *accel_priv, select_queue_fallback_t fallback)
{
struct net_device_context *net_device_ctx = netdev_priv(ndev);
struct hv_device *hdev = net_device_ctx->device_ctx;
struct netvsc_device *nvsc_dev = hv_get_drvdata(hdev);
u32 hash;
u16 q_idx = 0;
if (nvsc_dev == NULL || ndev->real_num_tx_queues <= 1)
return 0;
if (netvsc_set_hash(&hash, skb)) {
q_idx = nvsc_dev->send_table[hash % VRSS_SEND_TAB_SIZE] %
ndev->real_num_tx_queues;
skb_set_hash(skb, hash, PKT_HASH_TYPE_L3);
}
return q_idx;
}
void netvsc_xmit_completion(void *context)
{
struct hv_netvsc_packet *packet = (struct hv_netvsc_packet *)context;
struct sk_buff *skb = (struct sk_buff *)
(unsigned long)packet->send_completion_tid;
if (!packet->part_of_skb)
kfree(packet);
if (skb)
dev_kfree_skb_any(skb);
}
static u32 fill_pg_buf(struct page *page, u32 offset, u32 len,
struct hv_page_buffer *pb)
{
int j = 0;
/* Deal with compund pages by ignoring unused part
* of the page.
*/
page += (offset >> PAGE_SHIFT);
offset &= ~PAGE_MASK;
while (len > 0) {
unsigned long bytes;
bytes = PAGE_SIZE - offset;
if (bytes > len)
bytes = len;
pb[j].pfn = page_to_pfn(page);
pb[j].offset = offset;
pb[j].len = bytes;
offset += bytes;
len -= bytes;
if (offset == PAGE_SIZE && len) {
page++;
offset = 0;
j++;
}
}
return j + 1;
}
static u32 init_page_array(void *hdr, u32 len, struct sk_buff *skb,
struct hv_netvsc_packet *packet)
{
struct hv_page_buffer *pb = packet->page_buf;
u32 slots_used = 0;
char *data = skb->data;
int frags = skb_shinfo(skb)->nr_frags;
int i;
/* The packet is laid out thus:
* 1. hdr: RNDIS header and PPI
* 2. skb linear data
* 3. skb fragment data
*/
if (hdr != NULL)
slots_used += fill_pg_buf(virt_to_page(hdr),
offset_in_page(hdr),
len, &pb[slots_used]);
packet->rmsg_size = len;
packet->rmsg_pgcnt = slots_used;
slots_used += fill_pg_buf(virt_to_page(data),
offset_in_page(data),
skb_headlen(skb), &pb[slots_used]);
for (i = 0; i < frags; i++) {
skb_frag_t *frag = skb_shinfo(skb)->frags + i;
slots_used += fill_pg_buf(skb_frag_page(frag),
frag->page_offset,
skb_frag_size(frag), &pb[slots_used]);
}
return slots_used;
}
static int count_skb_frag_slots(struct sk_buff *skb)
{
int i, frags = skb_shinfo(skb)->nr_frags;
int pages = 0;
for (i = 0; i < frags; i++) {
skb_frag_t *frag = skb_shinfo(skb)->frags + i;
unsigned long size = skb_frag_size(frag);
unsigned long offset = frag->page_offset;
/* Skip unused frames from start of page */
offset &= ~PAGE_MASK;
pages += PFN_UP(offset + size);
}
return pages;
}
static int netvsc_get_slots(struct sk_buff *skb)
{
char *data = skb->data;
unsigned int offset = offset_in_page(data);
unsigned int len = skb_headlen(skb);
int slots;
int frag_slots;
slots = DIV_ROUND_UP(offset + len, PAGE_SIZE);
frag_slots = count_skb_frag_slots(skb);
return slots + frag_slots;
}
static u32 get_net_transport_info(struct sk_buff *skb, u32 *trans_off)
{
u32 ret_val = TRANSPORT_INFO_NOT_IP;
if ((eth_hdr(skb)->h_proto != htons(ETH_P_IP)) &&
(eth_hdr(skb)->h_proto != htons(ETH_P_IPV6))) {
goto not_ip;
}
*trans_off = skb_transport_offset(skb);
if ((eth_hdr(skb)->h_proto == htons(ETH_P_IP))) {
struct iphdr *iphdr = ip_hdr(skb);
if (iphdr->protocol == IPPROTO_TCP)
ret_val = TRANSPORT_INFO_IPV4_TCP;
else if (iphdr->protocol == IPPROTO_UDP)
ret_val = TRANSPORT_INFO_IPV4_UDP;
} else {
if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
ret_val = TRANSPORT_INFO_IPV6_TCP;
else if (ipv6_hdr(skb)->nexthdr == IPPROTO_UDP)
ret_val = TRANSPORT_INFO_IPV6_UDP;
}
not_ip:
return ret_val;
}
static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
{
struct net_device_context *net_device_ctx = netdev_priv(net);
struct hv_netvsc_packet *packet = NULL;
int ret;
unsigned int num_data_pgs;
struct rndis_message *rndis_msg;
struct rndis_packet *rndis_pkt;
u32 rndis_msg_size;
bool isvlan;
bool linear = false;
struct rndis_per_packet_info *ppi;
struct ndis_tcp_ip_checksum_info *csum_info;
struct ndis_tcp_lso_info *lso_info;
int hdr_offset;
u32 net_trans_info;
u32 hash;
u32 skb_length;
u32 head_room;
u32 pkt_sz;
struct hv_page_buffer page_buf[MAX_PAGE_BUFFER_COUNT];
/* We will atmost need two pages to describe the rndis
* header. We can only transmit MAX_PAGE_BUFFER_COUNT number
* of pages in a single packet. If skb is scattered around
* more pages we try linearizing it.
*/
check_size:
skb_length = skb->len;
head_room = skb_headroom(skb);
num_data_pgs = netvsc_get_slots(skb) + 2;
if (num_data_pgs > MAX_PAGE_BUFFER_COUNT && linear) {
net_alert_ratelimited("packet too big: %u pages (%u bytes)\n",
num_data_pgs, skb->len);
ret = -EFAULT;
goto drop;
} else if (num_data_pgs > MAX_PAGE_BUFFER_COUNT) {
if (skb_linearize(skb)) {
net_alert_ratelimited("failed to linearize skb\n");
ret = -ENOMEM;
goto drop;
}
linear = true;
goto check_size;
}
pkt_sz = sizeof(struct hv_netvsc_packet) + RNDIS_AND_PPI_SIZE;
if (head_room < pkt_sz) {
packet = kmalloc(pkt_sz, GFP_ATOMIC);
if (!packet) {
/* out of memory, drop packet */
netdev_err(net, "unable to alloc hv_netvsc_packet\n");
ret = -ENOMEM;
goto drop;
}
packet->part_of_skb = false;
} else {
/* Use the headroom for building up the packet */
packet = (struct hv_netvsc_packet *)skb->head;
packet->part_of_skb = true;
}
packet->status = 0;
packet->xmit_more = skb->xmit_more;
packet->vlan_tci = skb->vlan_tci;
packet->page_buf = page_buf;
packet->q_idx = skb_get_queue_mapping(skb);
packet->is_data_pkt = true;
packet->total_data_buflen = skb->len;
packet->rndis_msg = (struct rndis_message *)((unsigned long)packet +
sizeof(struct hv_netvsc_packet));
memset(packet->rndis_msg, 0, RNDIS_AND_PPI_SIZE);
/* Set the completion routine */
packet->send_completion = netvsc_xmit_completion;
packet->send_completion_ctx = packet;
packet->send_completion_tid = (unsigned long)skb;
isvlan = packet->vlan_tci & VLAN_TAG_PRESENT;
/* Add the rndis header */
rndis_msg = packet->rndis_msg;
rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET;
rndis_msg->msg_len = packet->total_data_buflen;
rndis_pkt = &rndis_msg->msg.pkt;
rndis_pkt->data_offset = sizeof(struct rndis_packet);
rndis_pkt->data_len = packet->total_data_buflen;
rndis_pkt->per_pkt_info_offset = sizeof(struct rndis_packet);
rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet);
hash = skb_get_hash_raw(skb);
if (hash != 0 && net->real_num_tx_queues > 1) {
rndis_msg_size += NDIS_HASH_PPI_SIZE;
ppi = init_ppi_data(rndis_msg, NDIS_HASH_PPI_SIZE,
NBL_HASH_VALUE);
*(u32 *)((void *)ppi + ppi->ppi_offset) = hash;
}
if (isvlan) {
struct ndis_pkt_8021q_info *vlan;
rndis_msg_size += NDIS_VLAN_PPI_SIZE;
ppi = init_ppi_data(rndis_msg, NDIS_VLAN_PPI_SIZE,
IEEE_8021Q_INFO);
vlan = (struct ndis_pkt_8021q_info *)((void *)ppi +
ppi->ppi_offset);
vlan->vlanid = packet->vlan_tci & VLAN_VID_MASK;
vlan->pri = (packet->vlan_tci & VLAN_PRIO_MASK) >>
VLAN_PRIO_SHIFT;
}
net_trans_info = get_net_transport_info(skb, &hdr_offset);
if (net_trans_info == TRANSPORT_INFO_NOT_IP)
goto do_send;
/*
* Setup the sendside checksum offload only if this is not a
* GSO packet.
*/
if (skb_is_gso(skb))
goto do_lso;
if ((skb->ip_summed == CHECKSUM_NONE) ||
(skb->ip_summed == CHECKSUM_UNNECESSARY))
goto do_send;
rndis_msg_size += NDIS_CSUM_PPI_SIZE;
ppi = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE,
TCPIP_CHKSUM_PKTINFO);
csum_info = (struct ndis_tcp_ip_checksum_info *)((void *)ppi +
ppi->ppi_offset);
if (net_trans_info & (INFO_IPV4 << 16))
csum_info->transmit.is_ipv4 = 1;
else
csum_info->transmit.is_ipv6 = 1;
if (net_trans_info & INFO_TCP) {
csum_info->transmit.tcp_checksum = 1;
csum_info->transmit.tcp_header_offset = hdr_offset;
} else if (net_trans_info & INFO_UDP) {
/* UDP checksum offload is not supported on ws2008r2.
* Furthermore, on ws2012 and ws2012r2, there are some
* issues with udp checksum offload from Linux guests.
* (these are host issues).
* For now compute the checksum here.
*/
struct udphdr *uh;
u16 udp_len;
ret = skb_cow_head(skb, 0);
if (ret)
goto drop;
uh = udp_hdr(skb);
udp_len = ntohs(uh->len);
uh->check = 0;
uh->check = csum_tcpudp_magic(ip_hdr(skb)->saddr,
ip_hdr(skb)->daddr,
udp_len, IPPROTO_UDP,
csum_partial(uh, udp_len, 0));
if (uh->check == 0)
uh->check = CSUM_MANGLED_0;
csum_info->transmit.udp_checksum = 0;
}
goto do_send;
do_lso:
rndis_msg_size += NDIS_LSO_PPI_SIZE;
ppi = init_ppi_data(rndis_msg, NDIS_LSO_PPI_SIZE,
TCP_LARGESEND_PKTINFO);
lso_info = (struct ndis_tcp_lso_info *)((void *)ppi +
ppi->ppi_offset);
lso_info->lso_v2_transmit.type = NDIS_TCP_LARGE_SEND_OFFLOAD_V2_TYPE;
if (net_trans_info & (INFO_IPV4 << 16)) {
lso_info->lso_v2_transmit.ip_version =
NDIS_TCP_LARGE_SEND_OFFLOAD_IPV4;
ip_hdr(skb)->tot_len = 0;
ip_hdr(skb)->check = 0;
tcp_hdr(skb)->check =
~csum_tcpudp_magic(ip_hdr(skb)->saddr,
ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
} else {
lso_info->lso_v2_transmit.ip_version =
NDIS_TCP_LARGE_SEND_OFFLOAD_IPV6;
ipv6_hdr(skb)->payload_len = 0;
tcp_hdr(skb)->check =
~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
&ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
}
lso_info->lso_v2_transmit.tcp_header_offset = hdr_offset;
lso_info->lso_v2_transmit.mss = skb_shinfo(skb)->gso_size;
do_send:
/* Start filling in the page buffers with the rndis hdr */
rndis_msg->msg_len += rndis_msg_size;
packet->total_data_buflen = rndis_msg->msg_len;
packet->page_buf_cnt = init_page_array(rndis_msg, rndis_msg_size,
skb, packet);
ret = netvsc_send(net_device_ctx->device_ctx, packet);
drop:
if (ret == 0) {
net->stats.tx_bytes += skb_length;
net->stats.tx_packets++;
} else {
if (packet && !packet->part_of_skb)
kfree(packet);
if (ret != -EAGAIN) {
dev_kfree_skb_any(skb);
net->stats.tx_dropped++;
}
}
return (ret == -EAGAIN) ? NETDEV_TX_BUSY : NETDEV_TX_OK;
}
/*
* netvsc_linkstatus_callback - Link up/down notification
*/
void netvsc_linkstatus_callback(struct hv_device *device_obj,
struct rndis_message *resp)
{
struct rndis_indicate_status *indicate = &resp->msg.indicate_status;
struct net_device *net;
struct net_device_context *ndev_ctx;
struct netvsc_device *net_device;
struct rndis_device *rdev;
net_device = hv_get_drvdata(device_obj);
rdev = net_device->extension;
switch (indicate->status) {
case RNDIS_STATUS_MEDIA_CONNECT:
rdev->link_state = false;
break;
case RNDIS_STATUS_MEDIA_DISCONNECT:
rdev->link_state = true;
break;
case RNDIS_STATUS_NETWORK_CHANGE:
rdev->link_change = true;
break;
default:
return;
}
net = net_device->ndev;
if (!net || net->reg_state != NETREG_REGISTERED)
return;
ndev_ctx = netdev_priv(net);
if (!rdev->link_state) {
schedule_delayed_work(&ndev_ctx->dwork, 0);
schedule_delayed_work(&ndev_ctx->dwork, msecs_to_jiffies(20));
} else {
schedule_delayed_work(&ndev_ctx->dwork, 0);
}
}
/*
* netvsc_recv_callback - Callback when we receive a packet from the
* "wire" on the specified device.
*/
int netvsc_recv_callback(struct hv_device *device_obj,
struct hv_netvsc_packet *packet,
struct ndis_tcp_ip_checksum_info *csum_info)
{
struct net_device *net;
struct sk_buff *skb;
net = ((struct netvsc_device *)hv_get_drvdata(device_obj))->ndev;
if (!net || net->reg_state != NETREG_REGISTERED) {
packet->status = NVSP_STAT_FAIL;
return 0;
}
/* Allocate a skb - TODO direct I/O to pages? */
skb = netdev_alloc_skb_ip_align(net, packet->total_data_buflen);
if (unlikely(!skb)) {
++net->stats.rx_dropped;
packet->status = NVSP_STAT_FAIL;
return 0;
}
/*
* Copy to skb. This copy is needed here since the memory pointed by
* hv_netvsc_packet cannot be deallocated
*/
memcpy(skb_put(skb, packet->total_data_buflen), packet->data,
packet->total_data_buflen);
skb->protocol = eth_type_trans(skb, net);
if (csum_info) {
/* We only look at the IP checksum here.
* Should we be dropping the packet if checksum
* failed? How do we deal with other checksums - TCP/UDP?
*/
if (csum_info->receive.ip_checksum_succeeded)
skb->ip_summed = CHECKSUM_UNNECESSARY;
else
skb->ip_summed = CHECKSUM_NONE;
}
if (packet->vlan_tci & VLAN_TAG_PRESENT)
__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
packet->vlan_tci);
skb_record_rx_queue(skb, packet->channel->
offermsg.offer.sub_channel_index);
net->stats.rx_packets++;
net->stats.rx_bytes += packet->total_data_buflen;
/*
* Pass the skb back up. Network stack will deallocate the skb when it
* is done.
* TODO - use NAPI?
*/
netif_rx(skb);
return 0;
}
static void netvsc_get_drvinfo(struct net_device *net,
struct ethtool_drvinfo *info)
{
strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
}
static void netvsc_get_channels(struct net_device *net,
struct ethtool_channels *channel)
{
struct net_device_context *net_device_ctx = netdev_priv(net);
struct hv_device *dev = net_device_ctx->device_ctx;
struct netvsc_device *nvdev = hv_get_drvdata(dev);
if (nvdev) {
channel->max_combined = nvdev->max_chn;
channel->combined_count = nvdev->num_chn;
}
}
static int netvsc_change_mtu(struct net_device *ndev, int mtu)
{
struct net_device_context *ndevctx = netdev_priv(ndev);
struct hv_device *hdev = ndevctx->device_ctx;
struct netvsc_device *nvdev = hv_get_drvdata(hdev);
struct netvsc_device_info device_info;
int limit = ETH_DATA_LEN;
if (nvdev == NULL || nvdev->destroy)
return -ENODEV;
if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2)
limit = NETVSC_MTU - ETH_HLEN;
/* Hyper-V hosts don't support MTU < ETH_DATA_LEN (1500) */
if (mtu < ETH_DATA_LEN || mtu > limit)
return -EINVAL;
nvdev->start_remove = true;
cancel_work_sync(&ndevctx->work);
netif_tx_disable(ndev);
rndis_filter_device_remove(hdev);
ndev->mtu = mtu;
ndevctx->device_ctx = hdev;
hv_set_drvdata(hdev, ndev);
device_info.ring_size = ring_size;
rndis_filter_device_add(hdev, &device_info);
netif_tx_wake_all_queues(ndev);
return 0;
}
static int netvsc_set_mac_addr(struct net_device *ndev, void *p)
{
struct net_device_context *ndevctx = netdev_priv(ndev);
struct hv_device *hdev = ndevctx->device_ctx;
struct sockaddr *addr = p;
char save_adr[ETH_ALEN];
unsigned char save_aatype;
int err;
memcpy(save_adr, ndev->dev_addr, ETH_ALEN);
save_aatype = ndev->addr_assign_type;
err = eth_mac_addr(ndev, p);
if (err != 0)
return err;
err = rndis_filter_set_device_mac(hdev, addr->sa_data);
if (err != 0) {
/* roll back to saved MAC */
memcpy(ndev->dev_addr, save_adr, ETH_ALEN);
ndev->addr_assign_type = save_aatype;
}
return err;
}
#ifdef CONFIG_NET_POLL_CONTROLLER
static void netvsc_poll_controller(struct net_device *net)
{
/* As netvsc_start_xmit() works synchronous we don't have to
* trigger anything here.
*/
}
#endif
static const struct ethtool_ops ethtool_ops = {
.get_drvinfo = netvsc_get_drvinfo,
.get_link = ethtool_op_get_link,
.get_channels = netvsc_get_channels,
};
static const struct net_device_ops device_ops = {
.ndo_open = netvsc_open,
.ndo_stop = netvsc_close,
.ndo_start_xmit = netvsc_start_xmit,
.ndo_set_rx_mode = netvsc_set_multicast_list,
.ndo_change_mtu = netvsc_change_mtu,
.ndo_validate_addr = eth_validate_addr,
.ndo_set_mac_address = netvsc_set_mac_addr,
.ndo_select_queue = netvsc_select_queue,
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_poll_controller = netvsc_poll_controller,
#endif
};
/*
* Send GARP packet to network peers after migrations.
* After Quick Migration, the network is not immediately operational in the
* current context when receiving RNDIS_STATUS_MEDIA_CONNECT event. So, add
* another netif_notify_peers() into a delayed work, otherwise GARP packet
* will not be sent after quick migration, and cause network disconnection.
* Also, we update the carrier status here.
*/
static void netvsc_link_change(struct work_struct *w)
{
struct net_device_context *ndev_ctx;
struct net_device *net;
struct netvsc_device *net_device;
struct rndis_device *rdev;
bool notify, refresh = false;
char *argv[] = { "/etc/init.d/network", "restart", NULL };
char *envp[] = { "HOME=/", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL };
rtnl_lock();
ndev_ctx = container_of(w, struct net_device_context, dwork.work);
net_device = hv_get_drvdata(ndev_ctx->device_ctx);
rdev = net_device->extension;
net = net_device->ndev;
if (rdev->link_state) {
netif_carrier_off(net);
notify = false;
} else {
netif_carrier_on(net);
notify = true;
if (rdev->link_change) {
rdev->link_change = false;
refresh = true;
}
}
rtnl_unlock();
if (refresh)
call_usermodehelper(argv[0], argv, envp, UMH_WAIT_EXEC);
if (notify)
netdev_notify_peers(net);
}
static int netvsc_probe(struct hv_device *dev,
const struct hv_vmbus_device_id *dev_id)
{
struct net_device *net = NULL;
struct net_device_context *net_device_ctx;
struct netvsc_device_info device_info;
struct netvsc_device *nvdev;
int ret;
u32 max_needed_headroom;
net = alloc_etherdev_mq(sizeof(struct net_device_context),
num_online_cpus());
if (!net)
return -ENOMEM;
max_needed_headroom = sizeof(struct hv_netvsc_packet) +
RNDIS_AND_PPI_SIZE;
netif_carrier_off(net);
net_device_ctx = netdev_priv(net);
net_device_ctx->device_ctx = dev;
hv_set_drvdata(dev, net);
INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_link_change);
INIT_WORK(&net_device_ctx->work, do_set_multicast);
net->netdev_ops = &device_ops;
net->hw_features = NETIF_F_RXCSUM | NETIF_F_SG | NETIF_F_IP_CSUM |
NETIF_F_TSO;
net->features = NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_SG | NETIF_F_RXCSUM |
NETIF_F_IP_CSUM | NETIF_F_TSO;
net->ethtool_ops = &ethtool_ops;
SET_NETDEV_DEV(net, &dev->device);
/*
* Request additional head room in the skb.
* We will use this space to build the rndis
* heaser and other state we need to maintain.
*/
net->needed_headroom = max_needed_headroom;
/* Notify the netvsc driver of the new device */
device_info.ring_size = ring_size;
ret = rndis_filter_device_add(dev, &device_info);
if (ret != 0) {
netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
free_netdev(net);
hv_set_drvdata(dev, NULL);
return ret;
}
memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN);
nvdev = hv_get_drvdata(dev);
netif_set_real_num_tx_queues(net, nvdev->num_chn);
netif_set_real_num_rx_queues(net, nvdev->num_chn);
ret = register_netdev(net);
if (ret != 0) {
pr_err("Unable to register netdev.\n");
rndis_filter_device_remove(dev);
free_netdev(net);
} else {
schedule_delayed_work(&net_device_ctx->dwork, 0);
}
return ret;
}
static int netvsc_remove(struct hv_device *dev)
{
struct net_device *net;
struct net_device_context *ndev_ctx;
struct netvsc_device *net_device;
net_device = hv_get_drvdata(dev);
net = net_device->ndev;
if (net == NULL) {
dev_err(&dev->device, "No net device to remove\n");
return 0;
}
net_device->start_remove = true;
ndev_ctx = netdev_priv(net);
cancel_delayed_work_sync(&ndev_ctx->dwork);
cancel_work_sync(&ndev_ctx->work);
/* Stop outbound asap */
netif_tx_disable(net);
unregister_netdev(net);
/*
* Call to the vsc driver to let it know that the device is being
* removed
*/
rndis_filter_device_remove(dev);
free_netdev(net);
return 0;
}
static const struct hv_vmbus_device_id id_table[] = {
/* Network guid */
{ HV_NIC_GUID, },
{ },
};
MODULE_DEVICE_TABLE(vmbus, id_table);
/* The one and only one */
static struct hv_driver netvsc_drv = {
.name = KBUILD_MODNAME,
.id_table = id_table,
.probe = netvsc_probe,
.remove = netvsc_remove,
};
static void __exit netvsc_drv_exit(void)
{
vmbus_driver_unregister(&netvsc_drv);
}
static int __init netvsc_drv_init(void)
{
if (ring_size < RING_SIZE_MIN) {
ring_size = RING_SIZE_MIN;
pr_info("Increased ring_size to %d (min allowed)\n",
ring_size);
}
return vmbus_driver_register(&netvsc_drv);
}
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Microsoft Hyper-V network driver");
module_init(netvsc_drv_init);
module_exit(netvsc_drv_exit);