forked from Minki/linux
942396b019
total_data_buflen is used by netvsc_send() to decide if a packet can be put into send buffer. It should also include the size of RNDIS message before the Ethernet frame. Otherwise, a messge with total size bigger than send_section_size may be copied into the send buffer, and cause data corruption. [Request to include this patch to the Stable branches] 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>
953 lines
24 KiB
C
953 lines
24 KiB
C
/*
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* Copyright (c) 2009, Microsoft Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, see <http://www.gnu.org/licenses/>.
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*
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* Authors:
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* Haiyang Zhang <haiyangz@microsoft.com>
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* Hank Janssen <hjanssen@microsoft.com>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/init.h>
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#include <linux/atomic.h>
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#include <linux/module.h>
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#include <linux/highmem.h>
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#include <linux/device.h>
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#include <linux/io.h>
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#include <linux/delay.h>
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#include <linux/netdevice.h>
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#include <linux/inetdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/skbuff.h>
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#include <linux/if_vlan.h>
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#include <linux/in.h>
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#include <linux/slab.h>
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#include <net/arp.h>
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#include <net/route.h>
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#include <net/sock.h>
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#include <net/pkt_sched.h>
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#include "hyperv_net.h"
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struct net_device_context {
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/* point back to our device context */
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struct hv_device *device_ctx;
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struct delayed_work dwork;
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struct work_struct work;
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};
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#define RING_SIZE_MIN 64
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static int ring_size = 128;
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module_param(ring_size, int, S_IRUGO);
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MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)");
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static void do_set_multicast(struct work_struct *w)
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{
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struct net_device_context *ndevctx =
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container_of(w, struct net_device_context, work);
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struct netvsc_device *nvdev;
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struct rndis_device *rdev;
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nvdev = hv_get_drvdata(ndevctx->device_ctx);
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if (nvdev == NULL || nvdev->ndev == NULL)
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return;
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rdev = nvdev->extension;
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if (rdev == NULL)
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return;
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if (nvdev->ndev->flags & IFF_PROMISC)
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rndis_filter_set_packet_filter(rdev,
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NDIS_PACKET_TYPE_PROMISCUOUS);
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else
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rndis_filter_set_packet_filter(rdev,
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NDIS_PACKET_TYPE_BROADCAST |
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NDIS_PACKET_TYPE_ALL_MULTICAST |
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NDIS_PACKET_TYPE_DIRECTED);
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}
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static void netvsc_set_multicast_list(struct net_device *net)
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{
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struct net_device_context *net_device_ctx = netdev_priv(net);
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schedule_work(&net_device_ctx->work);
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}
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static int netvsc_open(struct net_device *net)
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{
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struct net_device_context *net_device_ctx = netdev_priv(net);
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struct hv_device *device_obj = net_device_ctx->device_ctx;
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struct netvsc_device *nvdev;
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struct rndis_device *rdev;
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int ret = 0;
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netif_carrier_off(net);
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/* Open up the device */
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ret = rndis_filter_open(device_obj);
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if (ret != 0) {
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netdev_err(net, "unable to open device (ret %d).\n", ret);
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return ret;
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}
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netif_tx_start_all_queues(net);
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nvdev = hv_get_drvdata(device_obj);
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rdev = nvdev->extension;
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if (!rdev->link_state)
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netif_carrier_on(net);
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return ret;
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}
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static int netvsc_close(struct net_device *net)
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{
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struct net_device_context *net_device_ctx = netdev_priv(net);
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struct hv_device *device_obj = net_device_ctx->device_ctx;
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int ret;
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netif_tx_disable(net);
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/* Make sure netvsc_set_multicast_list doesn't re-enable filter! */
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cancel_work_sync(&net_device_ctx->work);
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ret = rndis_filter_close(device_obj);
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if (ret != 0)
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netdev_err(net, "unable to close device (ret %d).\n", ret);
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return ret;
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}
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static void *init_ppi_data(struct rndis_message *msg, u32 ppi_size,
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int pkt_type)
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{
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struct rndis_packet *rndis_pkt;
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struct rndis_per_packet_info *ppi;
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rndis_pkt = &msg->msg.pkt;
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rndis_pkt->data_offset += ppi_size;
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ppi = (struct rndis_per_packet_info *)((void *)rndis_pkt +
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rndis_pkt->per_pkt_info_offset + rndis_pkt->per_pkt_info_len);
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ppi->size = ppi_size;
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ppi->type = pkt_type;
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ppi->ppi_offset = sizeof(struct rndis_per_packet_info);
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rndis_pkt->per_pkt_info_len += ppi_size;
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return ppi;
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}
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union sub_key {
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u64 k;
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struct {
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u8 pad[3];
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u8 kb;
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u32 ka;
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};
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};
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/* Toeplitz hash function
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* data: network byte order
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* return: host byte order
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*/
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static u32 comp_hash(u8 *key, int klen, void *data, int dlen)
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{
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union sub_key subk;
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int k_next = 4;
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u8 dt;
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int i, j;
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u32 ret = 0;
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subk.k = 0;
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subk.ka = ntohl(*(u32 *)key);
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for (i = 0; i < dlen; i++) {
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subk.kb = key[k_next];
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k_next = (k_next + 1) % klen;
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dt = ((u8 *)data)[i];
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for (j = 0; j < 8; j++) {
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if (dt & 0x80)
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ret ^= subk.ka;
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dt <<= 1;
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subk.k <<= 1;
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}
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}
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return ret;
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}
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static bool netvsc_set_hash(u32 *hash, struct sk_buff *skb)
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{
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struct flow_keys flow;
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int data_len;
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if (!skb_flow_dissect(skb, &flow) || flow.n_proto != htons(ETH_P_IP))
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return false;
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if (flow.ip_proto == IPPROTO_TCP)
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data_len = 12;
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else
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data_len = 8;
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*hash = comp_hash(netvsc_hash_key, HASH_KEYLEN, &flow, data_len);
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return true;
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}
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static u16 netvsc_select_queue(struct net_device *ndev, struct sk_buff *skb,
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void *accel_priv, select_queue_fallback_t fallback)
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{
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struct net_device_context *net_device_ctx = netdev_priv(ndev);
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struct hv_device *hdev = net_device_ctx->device_ctx;
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struct netvsc_device *nvsc_dev = hv_get_drvdata(hdev);
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u32 hash;
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u16 q_idx = 0;
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if (nvsc_dev == NULL || ndev->real_num_tx_queues <= 1)
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return 0;
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if (netvsc_set_hash(&hash, skb)) {
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q_idx = nvsc_dev->send_table[hash % VRSS_SEND_TAB_SIZE] %
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ndev->real_num_tx_queues;
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skb_set_hash(skb, hash, PKT_HASH_TYPE_L3);
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}
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return q_idx;
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}
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static void netvsc_xmit_completion(void *context)
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{
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struct hv_netvsc_packet *packet = (struct hv_netvsc_packet *)context;
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struct sk_buff *skb = (struct sk_buff *)
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(unsigned long)packet->send_completion_tid;
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u32 index = packet->send_buf_index;
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kfree(packet);
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if (skb && (index == NETVSC_INVALID_INDEX))
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dev_kfree_skb_any(skb);
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}
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static u32 fill_pg_buf(struct page *page, u32 offset, u32 len,
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struct hv_page_buffer *pb)
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{
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int j = 0;
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/* Deal with compund pages by ignoring unused part
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* of the page.
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*/
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page += (offset >> PAGE_SHIFT);
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offset &= ~PAGE_MASK;
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while (len > 0) {
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unsigned long bytes;
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bytes = PAGE_SIZE - offset;
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if (bytes > len)
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bytes = len;
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pb[j].pfn = page_to_pfn(page);
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pb[j].offset = offset;
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pb[j].len = bytes;
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offset += bytes;
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len -= bytes;
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if (offset == PAGE_SIZE && len) {
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page++;
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offset = 0;
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j++;
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}
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}
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return j + 1;
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}
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static u32 init_page_array(void *hdr, u32 len, struct sk_buff *skb,
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struct hv_page_buffer *pb)
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{
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u32 slots_used = 0;
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char *data = skb->data;
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int frags = skb_shinfo(skb)->nr_frags;
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int i;
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/* The packet is laid out thus:
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* 1. hdr
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* 2. skb linear data
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* 3. skb fragment data
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*/
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if (hdr != NULL)
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slots_used += fill_pg_buf(virt_to_page(hdr),
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offset_in_page(hdr),
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len, &pb[slots_used]);
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slots_used += fill_pg_buf(virt_to_page(data),
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offset_in_page(data),
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skb_headlen(skb), &pb[slots_used]);
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for (i = 0; i < frags; i++) {
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skb_frag_t *frag = skb_shinfo(skb)->frags + i;
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slots_used += fill_pg_buf(skb_frag_page(frag),
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frag->page_offset,
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skb_frag_size(frag), &pb[slots_used]);
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}
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return slots_used;
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}
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static int count_skb_frag_slots(struct sk_buff *skb)
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{
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int i, frags = skb_shinfo(skb)->nr_frags;
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int pages = 0;
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for (i = 0; i < frags; i++) {
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skb_frag_t *frag = skb_shinfo(skb)->frags + i;
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unsigned long size = skb_frag_size(frag);
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unsigned long offset = frag->page_offset;
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/* Skip unused frames from start of page */
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offset &= ~PAGE_MASK;
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pages += PFN_UP(offset + size);
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}
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return pages;
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}
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static int netvsc_get_slots(struct sk_buff *skb)
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{
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char *data = skb->data;
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unsigned int offset = offset_in_page(data);
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unsigned int len = skb_headlen(skb);
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int slots;
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int frag_slots;
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slots = DIV_ROUND_UP(offset + len, PAGE_SIZE);
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frag_slots = count_skb_frag_slots(skb);
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return slots + frag_slots;
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}
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static u32 get_net_transport_info(struct sk_buff *skb, u32 *trans_off)
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{
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u32 ret_val = TRANSPORT_INFO_NOT_IP;
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if ((eth_hdr(skb)->h_proto != htons(ETH_P_IP)) &&
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(eth_hdr(skb)->h_proto != htons(ETH_P_IPV6))) {
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goto not_ip;
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}
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*trans_off = skb_transport_offset(skb);
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if ((eth_hdr(skb)->h_proto == htons(ETH_P_IP))) {
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struct iphdr *iphdr = ip_hdr(skb);
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if (iphdr->protocol == IPPROTO_TCP)
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ret_val = TRANSPORT_INFO_IPV4_TCP;
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else if (iphdr->protocol == IPPROTO_UDP)
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ret_val = TRANSPORT_INFO_IPV4_UDP;
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} else {
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if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
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ret_val = TRANSPORT_INFO_IPV6_TCP;
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else if (ipv6_hdr(skb)->nexthdr == IPPROTO_UDP)
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ret_val = TRANSPORT_INFO_IPV6_UDP;
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}
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not_ip:
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return ret_val;
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}
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static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
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{
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struct net_device_context *net_device_ctx = netdev_priv(net);
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struct hv_netvsc_packet *packet;
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int ret;
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unsigned int num_data_pgs;
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struct rndis_message *rndis_msg;
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struct rndis_packet *rndis_pkt;
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u32 rndis_msg_size;
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bool isvlan;
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struct rndis_per_packet_info *ppi;
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struct ndis_tcp_ip_checksum_info *csum_info;
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struct ndis_tcp_lso_info *lso_info;
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int hdr_offset;
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u32 net_trans_info;
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u32 hash;
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u32 skb_length = skb->len;
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/* We will atmost need two pages to describe the rndis
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* header. We can only transmit MAX_PAGE_BUFFER_COUNT number
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* of pages in a single packet.
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*/
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num_data_pgs = netvsc_get_slots(skb) + 2;
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if (num_data_pgs > MAX_PAGE_BUFFER_COUNT) {
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netdev_err(net, "Packet too big: %u\n", skb->len);
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dev_kfree_skb(skb);
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net->stats.tx_dropped++;
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return NETDEV_TX_OK;
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}
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/* Allocate a netvsc packet based on # of frags. */
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packet = kzalloc(sizeof(struct hv_netvsc_packet) +
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(num_data_pgs * sizeof(struct hv_page_buffer)) +
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sizeof(struct rndis_message) +
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NDIS_VLAN_PPI_SIZE + NDIS_CSUM_PPI_SIZE +
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NDIS_LSO_PPI_SIZE + NDIS_HASH_PPI_SIZE, GFP_ATOMIC);
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if (!packet) {
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/* out of memory, drop packet */
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netdev_err(net, "unable to allocate hv_netvsc_packet\n");
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dev_kfree_skb(skb);
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net->stats.tx_dropped++;
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return NETDEV_TX_OK;
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}
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packet->vlan_tci = skb->vlan_tci;
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packet->q_idx = skb_get_queue_mapping(skb);
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packet->is_data_pkt = true;
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packet->total_data_buflen = skb->len;
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packet->rndis_msg = (struct rndis_message *)((unsigned long)packet +
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sizeof(struct hv_netvsc_packet) +
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(num_data_pgs * sizeof(struct hv_page_buffer)));
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/* Set the completion routine */
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packet->send_completion = netvsc_xmit_completion;
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packet->send_completion_ctx = packet;
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packet->send_completion_tid = (unsigned long)skb;
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isvlan = packet->vlan_tci & VLAN_TAG_PRESENT;
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/* Add the rndis header */
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rndis_msg = packet->rndis_msg;
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rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET;
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rndis_msg->msg_len = packet->total_data_buflen;
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rndis_pkt = &rndis_msg->msg.pkt;
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rndis_pkt->data_offset = sizeof(struct rndis_packet);
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rndis_pkt->data_len = packet->total_data_buflen;
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rndis_pkt->per_pkt_info_offset = sizeof(struct rndis_packet);
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rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet);
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hash = skb_get_hash_raw(skb);
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if (hash != 0 && net->real_num_tx_queues > 1) {
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rndis_msg_size += NDIS_HASH_PPI_SIZE;
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ppi = init_ppi_data(rndis_msg, NDIS_HASH_PPI_SIZE,
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NBL_HASH_VALUE);
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*(u32 *)((void *)ppi + ppi->ppi_offset) = hash;
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}
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if (isvlan) {
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struct ndis_pkt_8021q_info *vlan;
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rndis_msg_size += NDIS_VLAN_PPI_SIZE;
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ppi = init_ppi_data(rndis_msg, NDIS_VLAN_PPI_SIZE,
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IEEE_8021Q_INFO);
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vlan = (struct ndis_pkt_8021q_info *)((void *)ppi +
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ppi->ppi_offset);
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vlan->vlanid = packet->vlan_tci & VLAN_VID_MASK;
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vlan->pri = (packet->vlan_tci & VLAN_PRIO_MASK) >>
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VLAN_PRIO_SHIFT;
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}
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net_trans_info = get_net_transport_info(skb, &hdr_offset);
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if (net_trans_info == TRANSPORT_INFO_NOT_IP)
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goto do_send;
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/*
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* Setup the sendside checksum offload only if this is not a
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* GSO packet.
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*/
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if (skb_is_gso(skb))
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goto do_lso;
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if ((skb->ip_summed == CHECKSUM_NONE) ||
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(skb->ip_summed == CHECKSUM_UNNECESSARY))
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goto do_send;
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rndis_msg_size += NDIS_CSUM_PPI_SIZE;
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ppi = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE,
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TCPIP_CHKSUM_PKTINFO);
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csum_info = (struct ndis_tcp_ip_checksum_info *)((void *)ppi +
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ppi->ppi_offset);
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if (net_trans_info & (INFO_IPV4 << 16))
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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->page_buf[0]);
|
|
|
|
ret = netvsc_send(net_device_ctx->device_ctx, packet);
|
|
|
|
drop:
|
|
if (ret == 0) {
|
|
net->stats.tx_bytes += skb_length;
|
|
net->stats.tx_packets++;
|
|
} else {
|
|
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 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;
|
|
|
|
if (mtu < 68 || 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,
|
|
};
|
|
|
|
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;
|
|
|
|
net = alloc_etherdev_mq(sizeof(struct net_device_context),
|
|
num_online_cpus());
|
|
if (!net)
|
|
return -ENOMEM;
|
|
|
|
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 = ðtool_ops;
|
|
SET_NETDEV_DEV(net, &dev->device);
|
|
|
|
/* 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);
|