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linux-stable/drivers/net/hyperv/netvsc.c
Linus Torvalds e0456717e4 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 
Pull networking updates from David Miller:

 1) Add TX fast path in mac80211, from Johannes Berg.

 2) Add TSO/GRO support to ibmveth, from Thomas Falcon

 3) Move away from cached routes in ipv6, just like ipv4, from Martin
    KaFai Lau.

 4) Lots of new rhashtable tests, from Thomas Graf.

 5) Run ingress qdisc lockless, from Alexei Starovoitov.

 6) Allow servers to fetch TCP packet headers for SYN packets of new
    connections, for fingerprinting.  From Eric Dumazet.

 7) Add mode parameter to pktgen, for testing receive.  From Alexei
    Starovoitov.

 8) Cache access optimizations via simplifications of build_skb(), from
    Alexander Duyck.

 9) Move page frag allocator under mm/, also from Alexander.

10) Add xmit_more support to hv_netvsc, from KY Srinivasan.

11) Add a counter guard in case we try to perform endless reclassify
    loops in the packet scheduler.

12) Extern flow dissector to be programmable and use it in new "Flower"
    classifier.  From Jiri Pirko.

13) AF_PACKET fanout rollover fixes, performance improvements, and new
    statistics.  From Willem de Bruijn.

14) Add netdev driver for GENEVE tunnels, from John W Linville.

15) Add ingress netfilter hooks and filtering, from Pablo Neira Ayuso.

16) Fix handling of epoll edge triggers in TCP, from Eric Dumazet.

17) Add an ECN retry fallback for the initial TCP handshake, from Daniel
    Borkmann.

18) Add tail call support to BPF, from Alexei Starovoitov.

19) Add several pktgen helper scripts, from Jesper Dangaard Brouer.

20) Add zerocopy support to AF_UNIX, from Hannes Frederic Sowa.

21) Favor even port numbers for allocation to connect() requests, and
    odd port numbers for bind(0), in an effort to help avoid
    ip_local_port_range exhaustion.  From Eric Dumazet.

22) Add Cavium ThunderX driver, from Sunil Goutham.

23) Allow bpf programs to access skb_iif and dev->ifindex SKB metadata,
    from Alexei Starovoitov.

24) Add support for T6 chips in cxgb4vf driver, from Hariprasad Shenai.

25) Double TCP Small Queues default to 256K to accomodate situations
    like the XEN driver and wireless aggregation.  From Wei Liu.

26) Add more entropy inputs to flow dissector, from Tom Herbert.

27) Add CDG congestion control algorithm to TCP, from Kenneth Klette
    Jonassen.

28) Convert ipset over to RCU locking, from Jozsef Kadlecsik.

29) Track and act upon link status of ipv4 route nexthops, from Andy
    Gospodarek.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1670 commits)
  bridge: vlan: flush the dynamically learned entries on port vlan delete
  bridge: multicast: add a comment to br_port_state_selection about blocking state
  net: inet_diag: export IPV6_V6ONLY sockopt
  stmmac: troubleshoot unexpected bits in des0 & des1
  net: ipv4 sysctl option to ignore routes when nexthop link is down
  net: track link-status of ipv4 nexthops
  net: switchdev: ignore unsupported bridge flags
  net: Cavium: Fix MAC address setting in shutdown state
  drivers: net: xgene: fix for ACPI support without ACPI
  ip: report the original address of ICMP messages
  net/mlx5e: Prefetch skb data on RX
  net/mlx5e: Pop cq outside mlx5e_get_cqe
  net/mlx5e: Remove mlx5e_cq.sqrq back-pointer
  net/mlx5e: Remove extra spaces
  net/mlx5e: Avoid TX CQE generation if more xmit packets expected
  net/mlx5e: Avoid redundant dev_kfree_skb() upon NOP completion
  net/mlx5e: Remove re-assignment of wq type in mlx5e_enable_rq()
  net/mlx5e: Use skb_shinfo(skb)->gso_segs rather than counting them
  net/mlx5e: Static mapping of netdev priv resources to/from netdev TX queues
  net/mlx4_en: Use HW counters for rx/tx bytes/packets in PF device
  ...
2015-06-24 16:49:49 -07:00

1250 lines
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/*
* 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/kernel.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/netdevice.h>
#include <linux/if_ether.h>
#include <linux/vmalloc.h>
#include <asm/sync_bitops.h>
#include "hyperv_net.h"
static struct netvsc_device *alloc_net_device(struct hv_device *device)
{
struct netvsc_device *net_device;
struct net_device *ndev = hv_get_drvdata(device);
int i;
net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL);
if (!net_device)
return NULL;
net_device->cb_buffer = kzalloc(NETVSC_PACKET_SIZE, GFP_KERNEL);
if (!net_device->cb_buffer) {
kfree(net_device);
return NULL;
}
init_waitqueue_head(&net_device->wait_drain);
net_device->start_remove = false;
net_device->destroy = false;
net_device->dev = device;
net_device->ndev = ndev;
net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT;
net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT;
for (i = 0; i < num_online_cpus(); i++)
spin_lock_init(&net_device->msd[i].lock);
hv_set_drvdata(device, net_device);
return net_device;
}
static void free_netvsc_device(struct netvsc_device *nvdev)
{
kfree(nvdev->cb_buffer);
kfree(nvdev);
}
static struct netvsc_device *get_outbound_net_device(struct hv_device *device)
{
struct netvsc_device *net_device;
net_device = hv_get_drvdata(device);
if (net_device && net_device->destroy)
net_device = NULL;
return net_device;
}
static struct netvsc_device *get_inbound_net_device(struct hv_device *device)
{
struct netvsc_device *net_device;
net_device = hv_get_drvdata(device);
if (!net_device)
goto get_in_err;
if (net_device->destroy &&
atomic_read(&net_device->num_outstanding_sends) == 0)
net_device = NULL;
get_in_err:
return net_device;
}
static int netvsc_destroy_buf(struct netvsc_device *net_device)
{
struct nvsp_message *revoke_packet;
int ret = 0;
struct net_device *ndev = net_device->ndev;
/*
* If we got a section count, it means we received a
* SendReceiveBufferComplete msg (ie sent
* NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
* to send a revoke msg here
*/
if (net_device->recv_section_cnt) {
/* Send the revoke receive buffer */
revoke_packet = &net_device->revoke_packet;
memset(revoke_packet, 0, sizeof(struct nvsp_message));
revoke_packet->hdr.msg_type =
NVSP_MSG1_TYPE_REVOKE_RECV_BUF;
revoke_packet->msg.v1_msg.
revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
ret = vmbus_sendpacket(net_device->dev->channel,
revoke_packet,
sizeof(struct nvsp_message),
(unsigned long)revoke_packet,
VM_PKT_DATA_INBAND, 0);
/*
* 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 send "
"revoke receive buffer to netvsp\n");
return ret;
}
}
/* Teardown the gpadl on the vsp end */
if (net_device->recv_buf_gpadl_handle) {
ret = vmbus_teardown_gpadl(net_device->dev->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 ret;
}
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->recv_section) {
net_device->recv_section_cnt = 0;
kfree(net_device->recv_section);
net_device->recv_section = 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
* NVSP_MSG1_TYPE_SEND_SEND_BUF msg) therefore, we need
* to send a revoke msg here
*/
if (net_device->send_section_size) {
/* Send the revoke receive buffer */
revoke_packet = &net_device->revoke_packet;
memset(revoke_packet, 0, sizeof(struct nvsp_message));
revoke_packet->hdr.msg_type =
NVSP_MSG1_TYPE_REVOKE_SEND_BUF;
revoke_packet->msg.v1_msg.revoke_send_buf.id =
NETVSC_SEND_BUFFER_ID;
ret = vmbus_sendpacket(net_device->dev->channel,
revoke_packet,
sizeof(struct nvsp_message),
(unsigned long)revoke_packet,
VM_PKT_DATA_INBAND, 0);
/* 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 send "
"revoke send buffer to netvsp\n");
return ret;
}
}
/* Teardown the gpadl on the vsp end */
if (net_device->send_buf_gpadl_handle) {
ret = vmbus_teardown_gpadl(net_device->dev->channel,
net_device->send_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 send buffer's gpadl\n");
return ret;
}
net_device->send_buf_gpadl_handle = 0;
}
if (net_device->send_buf) {
/* Free up the send buffer */
vfree(net_device->send_buf);
net_device->send_buf = NULL;
}
kfree(net_device->send_section_map);
return ret;
}
static int netvsc_init_buf(struct hv_device *device)
{
int ret = 0;
unsigned long t;
struct netvsc_device *net_device;
struct nvsp_message *init_packet;
struct net_device *ndev;
int node;
net_device = get_outbound_net_device(device);
if (!net_device)
return -ENODEV;
ndev = net_device->ndev;
node = cpu_to_node(device->channel->target_cpu);
net_device->recv_buf = vzalloc_node(net_device->recv_buf_size, node);
if (!net_device->recv_buf)
net_device->recv_buf = vzalloc(net_device->recv_buf_size);
if (!net_device->recv_buf) {
netdev_err(ndev, "unable to allocate receive "
"buffer of size %d\n", net_device->recv_buf_size);
ret = -ENOMEM;
goto cleanup;
}
/*
* Establish the gpadl handle for this buffer on this
* channel. Note: This call uses the vmbus connection rather
* than the channel to establish the gpadl handle.
*/
ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf,
net_device->recv_buf_size,
&net_device->recv_buf_gpadl_handle);
if (ret != 0) {
netdev_err(ndev,
"unable to establish receive buffer's gpadl\n");
goto cleanup;
}
/* Notify the NetVsp of the gpadl handle */
init_packet = &net_device->channel_init_pkt;
memset(init_packet, 0, sizeof(struct nvsp_message));
init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF;
init_packet->msg.v1_msg.send_recv_buf.
gpadl_handle = net_device->recv_buf_gpadl_handle;
init_packet->msg.v1_msg.
send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
/* Send the gpadl notification request */
ret = vmbus_sendpacket(device->channel, init_packet,
sizeof(struct nvsp_message),
(unsigned long)init_packet,
VM_PKT_DATA_INBAND,
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
if (ret != 0) {
netdev_err(ndev,
"unable to send receive buffer's gpadl to netvsp\n");
goto cleanup;
}
t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
BUG_ON(t == 0);
/* Check the response */
if (init_packet->msg.v1_msg.
send_recv_buf_complete.status != NVSP_STAT_SUCCESS) {
netdev_err(ndev, "Unable to complete receive buffer "
"initialization with NetVsp - status %d\n",
init_packet->msg.v1_msg.
send_recv_buf_complete.status);
ret = -EINVAL;
goto cleanup;
}
/* Parse the response */
net_device->recv_section_cnt = init_packet->msg.
v1_msg.send_recv_buf_complete.num_sections;
net_device->recv_section = kmemdup(
init_packet->msg.v1_msg.send_recv_buf_complete.sections,
net_device->recv_section_cnt *
sizeof(struct nvsp_1_receive_buffer_section),
GFP_KERNEL);
if (net_device->recv_section == NULL) {
ret = -EINVAL;
goto cleanup;
}
/*
* For 1st release, there should only be 1 section that represents the
* entire receive buffer
*/
if (net_device->recv_section_cnt != 1 ||
net_device->recv_section->offset != 0) {
ret = -EINVAL;
goto cleanup;
}
/* Now setup the send buffer.
*/
net_device->send_buf = vzalloc_node(net_device->send_buf_size, node);
if (!net_device->send_buf)
net_device->send_buf = vzalloc(net_device->send_buf_size);
if (!net_device->send_buf) {
netdev_err(ndev, "unable to allocate send "
"buffer of size %d\n", net_device->send_buf_size);
ret = -ENOMEM;
goto cleanup;
}
/* Establish the gpadl handle for this buffer on this
* channel. Note: This call uses the vmbus connection rather
* than the channel to establish the gpadl handle.
*/
ret = vmbus_establish_gpadl(device->channel, net_device->send_buf,
net_device->send_buf_size,
&net_device->send_buf_gpadl_handle);
if (ret != 0) {
netdev_err(ndev,
"unable to establish send buffer's gpadl\n");
goto cleanup;
}
/* Notify the NetVsp of the gpadl handle */
init_packet = &net_device->channel_init_pkt;
memset(init_packet, 0, sizeof(struct nvsp_message));
init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF;
init_packet->msg.v1_msg.send_send_buf.gpadl_handle =
net_device->send_buf_gpadl_handle;
init_packet->msg.v1_msg.send_send_buf.id = NETVSC_SEND_BUFFER_ID;
/* Send the gpadl notification request */
ret = vmbus_sendpacket(device->channel, init_packet,
sizeof(struct nvsp_message),
(unsigned long)init_packet,
VM_PKT_DATA_INBAND,
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
if (ret != 0) {
netdev_err(ndev,
"unable to send send buffer's gpadl to netvsp\n");
goto cleanup;
}
t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
BUG_ON(t == 0);
/* Check the response */
if (init_packet->msg.v1_msg.
send_send_buf_complete.status != NVSP_STAT_SUCCESS) {
netdev_err(ndev, "Unable to complete send buffer "
"initialization with NetVsp - status %d\n",
init_packet->msg.v1_msg.
send_send_buf_complete.status);
ret = -EINVAL;
goto cleanup;
}
/* Parse the response */
net_device->send_section_size = init_packet->msg.
v1_msg.send_send_buf_complete.section_size;
/* Section count is simply the size divided by the section size.
*/
net_device->send_section_cnt =
net_device->send_buf_size/net_device->send_section_size;
dev_info(&device->device, "Send section size: %d, Section count:%d\n",
net_device->send_section_size, net_device->send_section_cnt);
/* Setup state for managing the send buffer. */
net_device->map_words = DIV_ROUND_UP(net_device->send_section_cnt,
BITS_PER_LONG);
net_device->send_section_map =
kzalloc(net_device->map_words * sizeof(ulong), GFP_KERNEL);
if (net_device->send_section_map == NULL) {
ret = -ENOMEM;
goto cleanup;
}
goto exit;
cleanup:
netvsc_destroy_buf(net_device);
exit:
return ret;
}
/* Negotiate NVSP protocol version */
static int negotiate_nvsp_ver(struct hv_device *device,
struct netvsc_device *net_device,
struct nvsp_message *init_packet,
u32 nvsp_ver)
{
int ret;
unsigned long t;
memset(init_packet, 0, sizeof(struct nvsp_message));
init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT;
init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver;
init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver;
/* Send the init request */
ret = vmbus_sendpacket(device->channel, init_packet,
sizeof(struct nvsp_message),
(unsigned long)init_packet,
VM_PKT_DATA_INBAND,
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
if (ret != 0)
return ret;
t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
if (t == 0)
return -ETIMEDOUT;
if (init_packet->msg.init_msg.init_complete.status !=
NVSP_STAT_SUCCESS)
return -EINVAL;
if (nvsp_ver == NVSP_PROTOCOL_VERSION_1)
return 0;
/* NVSPv2 only: 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.capability.ieee8021q = 1;
ret = vmbus_sendpacket(device->channel, init_packet,
sizeof(struct nvsp_message),
(unsigned long)init_packet,
VM_PKT_DATA_INBAND, 0);
return ret;
}
static int netvsc_connect_vsp(struct hv_device *device)
{
int ret;
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 */
net_device = get_outbound_net_device(device);
if (!net_device)
return -ENODEV;
ndev = net_device->ndev;
init_packet = &net_device->channel_init_pkt;
/* Negotiate the latest NVSP protocol supported */
for (i = num_ver - 1; i >= 0; i--)
if (negotiate_nvsp_ver(device, net_device, init_packet,
ver_list[i]) == 0) {
net_device->nvsp_version = ver_list[i];
break;
}
if (i < 0) {
ret = -EPROTO;
goto cleanup;
}
pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version);
/* Send the ndis version */
memset(init_packet, 0, sizeof(struct nvsp_message));
if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4)
ndis_version = 0x00060001;
else
ndis_version = 0x0006001e;
init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER;
init_packet->msg.v1_msg.
send_ndis_ver.ndis_major_ver =
(ndis_version & 0xFFFF0000) >> 16;
init_packet->msg.v1_msg.
send_ndis_ver.ndis_minor_ver =
ndis_version & 0xFFFF;
/* Send the init request */
ret = vmbus_sendpacket(device->channel, init_packet,
sizeof(struct nvsp_message),
(unsigned long)init_packet,
VM_PKT_DATA_INBAND, 0);
if (ret != 0)
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;
net_device->send_buf_size = NETVSC_SEND_BUFFER_SIZE;
ret = netvsc_init_buf(device);
cleanup:
return ret;
}
static void netvsc_disconnect_vsp(struct netvsc_device *net_device)
{
netvsc_destroy_buf(net_device);
}
/*
* netvsc_device_remove - Callback when the root bus device is removed
*/
int netvsc_device_remove(struct hv_device *device)
{
struct netvsc_device *net_device;
unsigned long flags;
net_device = hv_get_drvdata(device);
netvsc_disconnect_vsp(net_device);
/*
* Since we have already drained, we don't need to busy wait
* as was done in final_release_stor_device()
* Note that we cannot set the ext pointer to NULL until
* we have drained - to drain the outgoing packets, we need to
* allow incoming packets.
*/
spin_lock_irqsave(&device->channel->inbound_lock, flags);
hv_set_drvdata(device, NULL);
spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
/*
* At this point, no one should be accessing net_device
* except in here
*/
dev_notice(&device->device, "net device safe to remove\n");
/* Now, we can close the channel safely */
vmbus_close(device->channel);
/* Release all resources */
vfree(net_device->sub_cb_buf);
free_netvsc_device(net_device);
return 0;
}
#define RING_AVAIL_PERCENT_HIWATER 20
#define RING_AVAIL_PERCENT_LOWATER 10
/*
* Get the percentage of available bytes to write in the ring.
* The return value is in range from 0 to 100.
*/
static inline u32 hv_ringbuf_avail_percent(
struct hv_ring_buffer_info *ring_info)
{
u32 avail_read, avail_write;
hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write);
return avail_write * 100 / ring_info->ring_datasize;
}
static inline void netvsc_free_send_slot(struct netvsc_device *net_device,
u32 index)
{
sync_change_bit(index, net_device->send_section_map);
}
static void netvsc_send_completion(struct netvsc_device *net_device,
struct hv_device *device,
struct vmpacket_descriptor *packet)
{
struct nvsp_message *nvsp_packet;
struct hv_netvsc_packet *nvsc_packet;
struct net_device *ndev;
u32 send_index;
ndev = net_device->ndev;
nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
(packet->offset8 << 3));
if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) ||
(nvsp_packet->hdr.msg_type ==
NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) ||
(nvsp_packet->hdr.msg_type ==
NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE) ||
(nvsp_packet->hdr.msg_type ==
NVSP_MSG5_TYPE_SUBCHANNEL)) {
/* Copy the response back */
memcpy(&net_device->channel_init_pkt, nvsp_packet,
sizeof(struct nvsp_message));
complete(&net_device->channel_init_wait);
} else if (nvsp_packet->hdr.msg_type ==
NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) {
int num_outstanding_sends;
u16 q_idx = 0;
struct vmbus_channel *channel = device->channel;
int queue_sends;
/* Get the send context */
nvsc_packet = (struct hv_netvsc_packet *)(unsigned long)
packet->trans_id;
/* Notify the layer above us */
if (nvsc_packet) {
send_index = nvsc_packet->send_buf_index;
if (send_index != NETVSC_INVALID_INDEX)
netvsc_free_send_slot(net_device, send_index);
q_idx = nvsc_packet->q_idx;
channel = nvsc_packet->channel;
nvsc_packet->send_completion(nvsc_packet->
send_completion_ctx);
}
num_outstanding_sends =
atomic_dec_return(&net_device->num_outstanding_sends);
queue_sends = atomic_dec_return(&net_device->
queue_sends[q_idx]);
if (net_device->destroy && num_outstanding_sends == 0)
wake_up(&net_device->wait_drain);
if (netif_tx_queue_stopped(netdev_get_tx_queue(ndev, q_idx)) &&
!net_device->start_remove &&
(hv_ringbuf_avail_percent(&channel->outbound) >
RING_AVAIL_PERCENT_HIWATER || queue_sends < 1))
netif_tx_wake_queue(netdev_get_tx_queue(
ndev, q_idx));
} else {
netdev_err(ndev, "Unknown send completion packet type- "
"%d received!!\n", nvsp_packet->hdr.msg_type);
}
}
static u32 netvsc_get_next_send_section(struct netvsc_device *net_device)
{
unsigned long index;
u32 max_words = net_device->map_words;
unsigned long *map_addr = (unsigned long *)net_device->send_section_map;
u32 section_cnt = net_device->send_section_cnt;
int ret_val = NETVSC_INVALID_INDEX;
int i;
int prev_val;
for (i = 0; i < max_words; i++) {
if (!~(map_addr[i]))
continue;
index = ffz(map_addr[i]);
prev_val = sync_test_and_set_bit(index, &map_addr[i]);
if (prev_val)
continue;
if ((index + (i * BITS_PER_LONG)) >= section_cnt)
break;
ret_val = (index + (i * BITS_PER_LONG));
break;
}
return ret_val;
}
static u32 netvsc_copy_to_send_buf(struct netvsc_device *net_device,
unsigned int section_index,
u32 pend_size,
struct hv_netvsc_packet *packet)
{
char *start = net_device->send_buf;
char *dest = start + (section_index * net_device->send_section_size)
+ pend_size;
int i;
u32 msg_size = 0;
u32 padding = 0;
u32 remain = packet->total_data_buflen % net_device->pkt_align;
u32 page_count = packet->cp_partial ? packet->rmsg_pgcnt :
packet->page_buf_cnt;
/* Add padding */
if (packet->is_data_pkt && packet->xmit_more && remain &&
!packet->cp_partial) {
padding = net_device->pkt_align - remain;
packet->rndis_msg->msg_len += padding;
packet->total_data_buflen += padding;
}
for (i = 0; i < page_count; i++) {
char *src = phys_to_virt(packet->page_buf[i].pfn << PAGE_SHIFT);
u32 offset = packet->page_buf[i].offset;
u32 len = packet->page_buf[i].len;
memcpy(dest, (src + offset), len);
msg_size += len;
dest += len;
}
if (padding) {
memset(dest, 0, padding);
msg_size += padding;
}
return msg_size;
}
static inline int netvsc_send_pkt(
struct hv_netvsc_packet *packet,
struct netvsc_device *net_device)
{
struct nvsp_message nvmsg;
struct vmbus_channel *out_channel = packet->channel;
u16 q_idx = packet->q_idx;
struct net_device *ndev = net_device->ndev;
u64 req_id;
int ret;
struct hv_page_buffer *pgbuf;
u32 ring_avail = hv_ringbuf_avail_percent(&out_channel->outbound);
nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
if (packet->is_data_pkt) {
/* 0 is RMC_DATA; */
nvmsg.msg.v1_msg.send_rndis_pkt.channel_type = 0;
} else {
/* 1 is RMC_CONTROL; */
nvmsg.msg.v1_msg.send_rndis_pkt.channel_type = 1;
}
nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_index =
packet->send_buf_index;
if (packet->send_buf_index == NETVSC_INVALID_INDEX)
nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0;
else
nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_size =
packet->total_data_buflen;
if (packet->send_completion)
req_id = (ulong)packet;
else
req_id = 0;
if (out_channel->rescind)
return -ENODEV;
/*
* It is possible that once we successfully place this packet
* on the ringbuffer, we may stop the queue. In that case, we want
* to notify the host independent of the xmit_more flag. We don't
* need to be precise here; in the worst case we may signal the host
* unnecessarily.
*/
if (ring_avail < (RING_AVAIL_PERCENT_LOWATER + 1))
packet->xmit_more = false;
if (packet->page_buf_cnt) {
pgbuf = packet->cp_partial ? packet->page_buf +
packet->rmsg_pgcnt : packet->page_buf;
ret = vmbus_sendpacket_pagebuffer_ctl(out_channel,
pgbuf,
packet->page_buf_cnt,
&nvmsg,
sizeof(struct nvsp_message),
req_id,
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED,
!packet->xmit_more);
} else {
ret = vmbus_sendpacket_ctl(out_channel, &nvmsg,
sizeof(struct nvsp_message),
req_id,
VM_PKT_DATA_INBAND,
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED,
!packet->xmit_more);
}
if (ret == 0) {
atomic_inc(&net_device->num_outstanding_sends);
atomic_inc(&net_device->queue_sends[q_idx]);
if (ring_avail < RING_AVAIL_PERCENT_LOWATER) {
netif_tx_stop_queue(netdev_get_tx_queue(ndev, q_idx));
if (atomic_read(&net_device->
queue_sends[q_idx]) < 1)
netif_tx_wake_queue(netdev_get_tx_queue(
ndev, q_idx));
}
} else if (ret == -EAGAIN) {
netif_tx_stop_queue(netdev_get_tx_queue(
ndev, q_idx));
if (atomic_read(&net_device->queue_sends[q_idx]) < 1) {
netif_tx_wake_queue(netdev_get_tx_queue(
ndev, q_idx));
ret = -ENOSPC;
}
} else {
netdev_err(ndev, "Unable to send packet %p ret %d\n",
packet, ret);
}
return ret;
}
int netvsc_send(struct hv_device *device,
struct hv_netvsc_packet *packet)
{
struct netvsc_device *net_device;
int ret = 0, m_ret = 0;
struct vmbus_channel *out_channel;
u16 q_idx = packet->q_idx;
u32 pktlen = packet->total_data_buflen, msd_len = 0;
unsigned int section_index = NETVSC_INVALID_INDEX;
unsigned long flag;
struct multi_send_data *msdp;
struct hv_netvsc_packet *msd_send = NULL, *cur_send = NULL;
bool try_batch;
net_device = get_outbound_net_device(device);
if (!net_device)
return -ENODEV;
out_channel = net_device->chn_table[q_idx];
if (!out_channel) {
out_channel = device->channel;
q_idx = 0;
packet->q_idx = 0;
}
packet->channel = out_channel;
packet->send_buf_index = NETVSC_INVALID_INDEX;
packet->cp_partial = false;
msdp = &net_device->msd[q_idx];
/* batch packets in send buffer if possible */
spin_lock_irqsave(&msdp->lock, flag);
if (msdp->pkt)
msd_len = msdp->pkt->total_data_buflen;
try_batch = packet->is_data_pkt && msd_len > 0 && msdp->count <
net_device->max_pkt;
if (try_batch && msd_len + pktlen + net_device->pkt_align <
net_device->send_section_size) {
section_index = msdp->pkt->send_buf_index;
} else if (try_batch && msd_len + packet->rmsg_size <
net_device->send_section_size) {
section_index = msdp->pkt->send_buf_index;
packet->cp_partial = true;
} else if (packet->is_data_pkt && pktlen + net_device->pkt_align <
net_device->send_section_size) {
section_index = netvsc_get_next_send_section(net_device);
if (section_index != NETVSC_INVALID_INDEX) {
msd_send = msdp->pkt;
msdp->pkt = NULL;
msdp->count = 0;
msd_len = 0;
}
}
if (section_index != NETVSC_INVALID_INDEX) {
netvsc_copy_to_send_buf(net_device,
section_index, msd_len,
packet);
packet->send_buf_index = section_index;
if (packet->cp_partial) {
packet->page_buf_cnt -= packet->rmsg_pgcnt;
packet->total_data_buflen = msd_len + packet->rmsg_size;
} else {
packet->page_buf_cnt = 0;
packet->total_data_buflen += msd_len;
}
if (msdp->pkt)
netvsc_xmit_completion(msdp->pkt);
if (packet->xmit_more && !packet->cp_partial) {
msdp->pkt = packet;
msdp->count++;
} else {
cur_send = packet;
msdp->pkt = NULL;
msdp->count = 0;
}
} else {
msd_send = msdp->pkt;
msdp->pkt = NULL;
msdp->count = 0;
cur_send = packet;
}
spin_unlock_irqrestore(&msdp->lock, flag);
if (msd_send) {
m_ret = netvsc_send_pkt(msd_send, net_device);
if (m_ret != 0) {
netvsc_free_send_slot(net_device,
msd_send->send_buf_index);
netvsc_xmit_completion(msd_send);
}
}
if (cur_send)
ret = netvsc_send_pkt(cur_send, net_device);
if (ret != 0 && section_index != NETVSC_INVALID_INDEX)
netvsc_free_send_slot(net_device, section_index);
return ret;
}
static void netvsc_send_recv_completion(struct hv_device *device,
struct vmbus_channel *channel,
struct netvsc_device *net_device,
u64 transaction_id, u32 status)
{
struct nvsp_message recvcompMessage;
int retries = 0;
int ret;
struct net_device *ndev;
ndev = net_device->ndev;
recvcompMessage.hdr.msg_type =
NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE;
recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status = status;
retry_send_cmplt:
/* Send the completion */
ret = vmbus_sendpacket(channel, &recvcompMessage,
sizeof(struct nvsp_message), transaction_id,
VM_PKT_COMP, 0);
if (ret == 0) {
/* success */
/* no-op */
} else if (ret == -EAGAIN) {
/* no more room...wait a bit and attempt to retry 3 times */
retries++;
netdev_err(ndev, "unable to send receive completion pkt"
" (tid %llx)...retrying %d\n", transaction_id, retries);
if (retries < 4) {
udelay(100);
goto retry_send_cmplt;
} else {
netdev_err(ndev, "unable to send receive "
"completion pkt (tid %llx)...give up retrying\n",
transaction_id);
}
} else {
netdev_err(ndev, "unable to send receive "
"completion pkt - %llx\n", transaction_id);
}
}
static void netvsc_receive(struct netvsc_device *net_device,
struct vmbus_channel *channel,
struct hv_device *device,
struct vmpacket_descriptor *packet)
{
struct vmtransfer_page_packet_header *vmxferpage_packet;
struct nvsp_message *nvsp_packet;
struct hv_netvsc_packet nv_pkt;
struct hv_netvsc_packet *netvsc_packet = &nv_pkt;
u32 status = NVSP_STAT_SUCCESS;
int i;
int count = 0;
struct net_device *ndev;
ndev = net_device->ndev;
/*
* All inbound packets other than send completion should be xfer page
* packet
*/
if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) {
netdev_err(ndev, "Unknown packet type received - %d\n",
packet->type);
return;
}
nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
(packet->offset8 << 3));
/* Make sure this is a valid nvsp packet */
if (nvsp_packet->hdr.msg_type !=
NVSP_MSG1_TYPE_SEND_RNDIS_PKT) {
netdev_err(ndev, "Unknown nvsp packet type received-"
" %d\n", nvsp_packet->hdr.msg_type);
return;
}
vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet;
if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) {
netdev_err(ndev, "Invalid xfer page set id - "
"expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID,
vmxferpage_packet->xfer_pageset_id);
return;
}
count = vmxferpage_packet->range_cnt;
netvsc_packet->channel = channel;
/* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
for (i = 0; i < count; i++) {
/* Initialize the netvsc packet */
netvsc_packet->status = NVSP_STAT_SUCCESS;
netvsc_packet->data = (void *)((unsigned long)net_device->
recv_buf + vmxferpage_packet->ranges[i].byte_offset);
netvsc_packet->total_data_buflen =
vmxferpage_packet->ranges[i].byte_count;
/* Pass it to the upper layer */
rndis_filter_receive(device, netvsc_packet);
if (netvsc_packet->status != NVSP_STAT_SUCCESS)
status = NVSP_STAT_FAIL;
}
netvsc_send_recv_completion(device, channel, net_device,
vmxferpage_packet->d.trans_id, status);
}
static void netvsc_send_table(struct hv_device *hdev,
struct vmpacket_descriptor *vmpkt)
{
struct netvsc_device *nvscdev;
struct net_device *ndev;
struct nvsp_message *nvmsg;
int i;
u32 count, *tab;
nvscdev = get_outbound_net_device(hdev);
if (!nvscdev)
return;
ndev = nvscdev->ndev;
nvmsg = (struct nvsp_message *)((unsigned long)vmpkt +
(vmpkt->offset8 << 3));
if (nvmsg->hdr.msg_type != NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE)
return;
count = nvmsg->msg.v5_msg.send_table.count;
if (count != VRSS_SEND_TAB_SIZE) {
netdev_err(ndev, "Received wrong send-table size:%u\n", count);
return;
}
tab = (u32 *)((unsigned long)&nvmsg->msg.v5_msg.send_table +
nvmsg->msg.v5_msg.send_table.offset);
for (i = 0; i < count; i++)
nvscdev->send_table[i] = tab[i];
}
void netvsc_channel_cb(void *context)
{
int ret;
struct vmbus_channel *channel = (struct vmbus_channel *)context;
struct hv_device *device;
struct netvsc_device *net_device;
u32 bytes_recvd;
u64 request_id;
struct vmpacket_descriptor *desc;
unsigned char *buffer;
int bufferlen = NETVSC_PACKET_SIZE;
struct net_device *ndev;
if (channel->primary_channel != NULL)
device = channel->primary_channel->device_obj;
else
device = channel->device_obj;
net_device = get_inbound_net_device(device);
if (!net_device)
return;
ndev = net_device->ndev;
buffer = get_per_channel_state(channel);
do {
ret = vmbus_recvpacket_raw(channel, buffer, bufferlen,
&bytes_recvd, &request_id);
if (ret == 0) {
if (bytes_recvd > 0) {
desc = (struct vmpacket_descriptor *)buffer;
switch (desc->type) {
case VM_PKT_COMP:
netvsc_send_completion(net_device,
device, desc);
break;
case VM_PKT_DATA_USING_XFER_PAGES:
netvsc_receive(net_device, channel,
device, desc);
break;
case VM_PKT_DATA_INBAND:
netvsc_send_table(device, desc);
break;
default:
netdev_err(ndev,
"unhandled packet type %d, "
"tid %llx len %d\n",
desc->type, request_id,
bytes_recvd);
break;
}
} else {
/*
* We are done for this pass.
*/
break;
}
} else if (ret == -ENOBUFS) {
if (bufferlen > NETVSC_PACKET_SIZE)
kfree(buffer);
/* Handle large packet */
buffer = kmalloc(bytes_recvd, GFP_ATOMIC);
if (buffer == NULL) {
/* Try again next time around */
netdev_err(ndev,
"unable to allocate buffer of size "
"(%d)!!\n", bytes_recvd);
break;
}
bufferlen = bytes_recvd;
}
} while (1);
if (bufferlen > NETVSC_PACKET_SIZE)
kfree(buffer);
return;
}
/*
* netvsc_device_add - Callback when the device belonging to this
* driver is added
*/
int netvsc_device_add(struct hv_device *device, void *additional_info)
{
int ret = 0;
int ring_size =
((struct netvsc_device_info *)additional_info)->ring_size;
struct netvsc_device *net_device;
struct net_device *ndev;
net_device = alloc_net_device(device);
if (!net_device)
return -ENOMEM;
net_device->ring_size = ring_size;
/*
* Coming into this function, struct net_device * is
* registered as the driver private data.
* In alloc_net_device(), we register struct netvsc_device *
* as the driver private data and stash away struct net_device *
* in struct netvsc_device *.
*/
ndev = net_device->ndev;
/* Add netvsc_device context to netvsc_device */
net_device->nd_ctx = netdev_priv(ndev);
/* Initialize the NetVSC channel extension */
init_completion(&net_device->channel_init_wait);
set_per_channel_state(device->channel, net_device->cb_buffer);
/* Open the channel */
ret = vmbus_open(device->channel, ring_size * PAGE_SIZE,
ring_size * PAGE_SIZE, NULL, 0,
netvsc_channel_cb, device->channel);
if (ret != 0) {
netdev_err(ndev, "unable to open channel: %d\n", ret);
goto cleanup;
}
/* Channel is opened */
pr_info("hv_netvsc channel opened successfully\n");
net_device->chn_table[0] = device->channel;
/* Connect with the NetVsp */
ret = netvsc_connect_vsp(device);
if (ret != 0) {
netdev_err(ndev,
"unable to connect to NetVSP - %d\n", ret);
goto close;
}
return ret;
close:
/* Now, we can close the channel safely */
vmbus_close(device->channel);
cleanup:
free_netvsc_device(net_device);
return ret;
}
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