diff options
Diffstat (limited to 'drivers/net/hyperv/netvsc.c')
| -rw-r--r-- | drivers/net/hyperv/netvsc.c | 1573 |
1 files changed, 1573 insertions, 0 deletions
diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c new file mode 100644 index 000000000..d15da8287 --- /dev/null +++ b/drivers/net/hyperv/netvsc.c @@ -0,0 +1,1573 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2009, Microsoft Corporation. + * + * 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 <linux/rtnetlink.h> +#include <linux/prefetch.h> + +#include <asm/sync_bitops.h> + +#include "hyperv_net.h" +#include "netvsc_trace.h" + +/* + * Switch the data path from the synthetic interface to the VF + * interface. + */ +void netvsc_switch_datapath(struct net_device *ndev, bool vf) +{ + struct net_device_context *net_device_ctx = netdev_priv(ndev); + struct hv_device *dev = net_device_ctx->device_ctx; + struct netvsc_device *nv_dev = rtnl_dereference(net_device_ctx->nvdev); + struct nvsp_message *init_pkt = &nv_dev->channel_init_pkt; + + memset(init_pkt, 0, sizeof(struct nvsp_message)); + init_pkt->hdr.msg_type = NVSP_MSG4_TYPE_SWITCH_DATA_PATH; + if (vf) + init_pkt->msg.v4_msg.active_dp.active_datapath = + NVSP_DATAPATH_VF; + else + init_pkt->msg.v4_msg.active_dp.active_datapath = + NVSP_DATAPATH_SYNTHETIC; + + trace_nvsp_send(ndev, init_pkt); + + vmbus_sendpacket(dev->channel, init_pkt, + sizeof(struct nvsp_message), + (unsigned long)init_pkt, + VM_PKT_DATA_INBAND, 0); +} + +/* Worker to setup sub channels on initial setup + * Initial hotplug event occurs in softirq context + * and can't wait for channels. + */ +static void netvsc_subchan_work(struct work_struct *w) +{ + struct netvsc_device *nvdev = + container_of(w, struct netvsc_device, subchan_work); + struct rndis_device *rdev; + int i, ret; + + /* Avoid deadlock with device removal already under RTNL */ + if (!rtnl_trylock()) { + schedule_work(w); + return; + } + + rdev = nvdev->extension; + if (rdev) { + ret = rndis_set_subchannel(rdev->ndev, nvdev, NULL); + if (ret == 0) { + netif_device_attach(rdev->ndev); + } else { + /* fallback to only primary channel */ + for (i = 1; i < nvdev->num_chn; i++) + netif_napi_del(&nvdev->chan_table[i].napi); + + nvdev->max_chn = 1; + nvdev->num_chn = 1; + } + } + + rtnl_unlock(); +} + +static struct netvsc_device *alloc_net_device(void) +{ + struct netvsc_device *net_device; + + net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL); + if (!net_device) + return NULL; + + init_waitqueue_head(&net_device->wait_drain); + net_device->destroy = false; + net_device->tx_disable = true; + + net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT; + net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT; + + init_completion(&net_device->channel_init_wait); + init_waitqueue_head(&net_device->subchan_open); + INIT_WORK(&net_device->subchan_work, netvsc_subchan_work); + + return net_device; +} + +static void free_netvsc_device(struct rcu_head *head) +{ + struct netvsc_device *nvdev + = container_of(head, struct netvsc_device, rcu); + int i; + + kfree(nvdev->extension); + vfree(nvdev->recv_buf); + vfree(nvdev->send_buf); + kfree(nvdev->send_section_map); + + for (i = 0; i < VRSS_CHANNEL_MAX; i++) { + xdp_rxq_info_unreg(&nvdev->chan_table[i].xdp_rxq); + vfree(nvdev->chan_table[i].mrc.slots); + } + + kfree(nvdev); +} + +static void free_netvsc_device_rcu(struct netvsc_device *nvdev) +{ + call_rcu(&nvdev->rcu, free_netvsc_device); +} + +static void netvsc_revoke_recv_buf(struct hv_device *device, + struct netvsc_device *net_device, + struct net_device *ndev) +{ + struct nvsp_message *revoke_packet; + int ret; + + /* + * 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; + + trace_nvsp_send(ndev, revoke_packet); + + ret = vmbus_sendpacket(device->channel, + revoke_packet, + sizeof(struct nvsp_message), + (unsigned long)revoke_packet, + VM_PKT_DATA_INBAND, 0); + /* If the failure is because the channel is rescinded; + * ignore the failure since we cannot send on a rescinded + * channel. This would allow us to properly cleanup + * even when the channel is rescinded. + */ + if (device->channel->rescind) + ret = 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; + } + net_device->recv_section_cnt = 0; + } +} + +static void netvsc_revoke_send_buf(struct hv_device *device, + struct netvsc_device *net_device, + struct net_device *ndev) +{ + struct nvsp_message *revoke_packet; + int ret; + + /* 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_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_SEND_BUF; + revoke_packet->msg.v1_msg.revoke_send_buf.id = + NETVSC_SEND_BUFFER_ID; + + trace_nvsp_send(ndev, revoke_packet); + + ret = vmbus_sendpacket(device->channel, + revoke_packet, + sizeof(struct nvsp_message), + (unsigned long)revoke_packet, + VM_PKT_DATA_INBAND, 0); + + /* If the failure is because the channel is rescinded; + * ignore the failure since we cannot send on a rescinded + * channel. This would allow us to properly cleanup + * even when the channel is rescinded. + */ + if (device->channel->rescind) + ret = 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; + } + net_device->send_section_cnt = 0; + } +} + +static void netvsc_teardown_recv_gpadl(struct hv_device *device, + struct netvsc_device *net_device, + struct net_device *ndev) +{ + int ret; + + if (net_device->recv_buf_gpadl_handle) { + ret = vmbus_teardown_gpadl(device->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; + } + net_device->recv_buf_gpadl_handle = 0; + } +} + +static void netvsc_teardown_send_gpadl(struct hv_device *device, + struct netvsc_device *net_device, + struct net_device *ndev) +{ + int ret; + + if (net_device->send_buf_gpadl_handle) { + ret = vmbus_teardown_gpadl(device->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; + } + net_device->send_buf_gpadl_handle = 0; + } +} + +int netvsc_alloc_recv_comp_ring(struct netvsc_device *net_device, u32 q_idx) +{ + struct netvsc_channel *nvchan = &net_device->chan_table[q_idx]; + int node = cpu_to_node(nvchan->channel->target_cpu); + size_t size; + + size = net_device->recv_completion_cnt * sizeof(struct recv_comp_data); + nvchan->mrc.slots = vzalloc_node(size, node); + if (!nvchan->mrc.slots) + nvchan->mrc.slots = vzalloc(size); + + return nvchan->mrc.slots ? 0 : -ENOMEM; +} + +static int netvsc_init_buf(struct hv_device *device, + struct netvsc_device *net_device, + const struct netvsc_device_info *device_info) +{ + struct nvsp_1_message_send_receive_buffer_complete *resp; + struct net_device *ndev = hv_get_drvdata(device); + struct nvsp_message *init_packet; + unsigned int buf_size; + size_t map_words; + int ret = 0; + + /* Get receive buffer area. */ + buf_size = device_info->recv_sections * device_info->recv_section_size; + buf_size = roundup(buf_size, PAGE_SIZE); + + /* Legacy hosts only allow smaller receive buffer */ + if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2) + buf_size = min_t(unsigned int, buf_size, + NETVSC_RECEIVE_BUFFER_SIZE_LEGACY); + + net_device->recv_buf = vzalloc(buf_size); + if (!net_device->recv_buf) { + netdev_err(ndev, + "unable to allocate receive buffer of size %u\n", + buf_size); + ret = -ENOMEM; + goto cleanup; + } + + net_device->recv_buf_size = buf_size; + + /* + * 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, + 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; + + trace_nvsp_send(ndev, init_packet); + + /* 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; + } + + wait_for_completion(&net_device->channel_init_wait); + + /* Check the response */ + resp = &init_packet->msg.v1_msg.send_recv_buf_complete; + if (resp->status != NVSP_STAT_SUCCESS) { + netdev_err(ndev, + "Unable to complete receive buffer initialization with NetVsp - status %d\n", + resp->status); + ret = -EINVAL; + goto cleanup; + } + + /* Parse the response */ + netdev_dbg(ndev, "Receive sections: %u sub_allocs: size %u count: %u\n", + resp->num_sections, resp->sections[0].sub_alloc_size, + resp->sections[0].num_sub_allocs); + + /* There should only be one section for the entire receive buffer */ + if (resp->num_sections != 1 || resp->sections[0].offset != 0) { + ret = -EINVAL; + goto cleanup; + } + + net_device->recv_section_size = resp->sections[0].sub_alloc_size; + net_device->recv_section_cnt = resp->sections[0].num_sub_allocs; + + /* Ensure buffer will not overflow */ + if (net_device->recv_section_size < NETVSC_MTU_MIN || (u64)net_device->recv_section_size * + (u64)net_device->recv_section_cnt > (u64)buf_size) { + netdev_err(ndev, "invalid recv_section_size %u\n", + net_device->recv_section_size); + ret = -EINVAL; + goto cleanup; + } + + /* Setup receive completion ring. + * Add 1 to the recv_section_cnt because at least one entry in a + * ring buffer has to be empty. + */ + net_device->recv_completion_cnt = net_device->recv_section_cnt + 1; + ret = netvsc_alloc_recv_comp_ring(net_device, 0); + if (ret) + goto cleanup; + + /* Now setup the send buffer. */ + buf_size = device_info->send_sections * device_info->send_section_size; + buf_size = round_up(buf_size, PAGE_SIZE); + + net_device->send_buf = vzalloc(buf_size); + if (!net_device->send_buf) { + netdev_err(ndev, "unable to allocate send buffer of size %u\n", + 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, + 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; + + trace_nvsp_send(ndev, init_packet); + + /* 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; + } + + wait_for_completion(&net_device->channel_init_wait); + + /* 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; + if (net_device->send_section_size < NETVSC_MTU_MIN) { + netdev_err(ndev, "invalid send_section_size %u\n", + net_device->send_section_size); + ret = -EINVAL; + goto cleanup; + } + + /* Section count is simply the size divided by the section size. */ + net_device->send_section_cnt = buf_size / net_device->send_section_size; + + netdev_dbg(ndev, "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. */ + map_words = DIV_ROUND_UP(net_device->send_section_cnt, BITS_PER_LONG); + + net_device->send_section_map = kcalloc(map_words, sizeof(ulong), GFP_KERNEL); + if (net_device->send_section_map == NULL) { + ret = -ENOMEM; + goto cleanup; + } + + goto exit; + +cleanup: + netvsc_revoke_recv_buf(device, net_device, ndev); + netvsc_revoke_send_buf(device, net_device, ndev); + netvsc_teardown_recv_gpadl(device, net_device, ndev); + netvsc_teardown_send_gpadl(device, net_device, ndev); + +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) +{ + struct net_device *ndev = hv_get_drvdata(device); + int ret; + + 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; + trace_nvsp_send(ndev, init_packet); + + /* 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; + + wait_for_completion(&net_device->channel_init_wait); + + if (init_packet->msg.init_msg.init_complete.status != + NVSP_STAT_SUCCESS) + return -EINVAL; + + if (nvsp_ver == NVSP_PROTOCOL_VERSION_1) + return 0; + + /* NVSPv2 or later: Send NDIS config */ + memset(init_packet, 0, sizeof(struct nvsp_message)); + init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG; + init_packet->msg.v2_msg.send_ndis_config.mtu = ndev->mtu + ETH_HLEN; + init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1; + + if (nvsp_ver >= NVSP_PROTOCOL_VERSION_5) { + init_packet->msg.v2_msg.send_ndis_config.capability.sriov = 1; + + /* Teaming bit is needed to receive link speed updates */ + init_packet->msg.v2_msg.send_ndis_config.capability.teaming = 1; + } + + if (nvsp_ver >= NVSP_PROTOCOL_VERSION_61) + init_packet->msg.v2_msg.send_ndis_config.capability.rsc = 1; + + trace_nvsp_send(ndev, init_packet); + + 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, + struct netvsc_device *net_device, + const struct netvsc_device_info *device_info) +{ + struct net_device *ndev = hv_get_drvdata(device); + static const u32 ver_list[] = { + NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2, + NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5, + NVSP_PROTOCOL_VERSION_6, NVSP_PROTOCOL_VERSION_61 + }; + struct nvsp_message *init_packet; + int ndis_version, i, ret; + + init_packet = &net_device->channel_init_pkt; + + /* Negotiate the latest NVSP protocol supported */ + for (i = ARRAY_SIZE(ver_list) - 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; + + trace_nvsp_send(ndev, init_packet); + + /* 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; + + + ret = netvsc_init_buf(device, net_device, device_info); + +cleanup: + return ret; +} + +/* + * netvsc_device_remove - Callback when the root bus device is removed + */ +void netvsc_device_remove(struct hv_device *device) +{ + struct net_device *ndev = hv_get_drvdata(device); + struct net_device_context *net_device_ctx = netdev_priv(ndev); + struct netvsc_device *net_device + = rtnl_dereference(net_device_ctx->nvdev); + int i; + + /* + * Revoke receive buffer. If host is pre-Win2016 then tear down + * receive buffer GPADL. Do the same for send buffer. + */ + netvsc_revoke_recv_buf(device, net_device, ndev); + if (vmbus_proto_version < VERSION_WIN10) + netvsc_teardown_recv_gpadl(device, net_device, ndev); + + netvsc_revoke_send_buf(device, net_device, ndev); + if (vmbus_proto_version < VERSION_WIN10) + netvsc_teardown_send_gpadl(device, net_device, ndev); + + RCU_INIT_POINTER(net_device_ctx->nvdev, NULL); + + /* Disable NAPI and disassociate its context from the device. */ + for (i = 0; i < net_device->num_chn; i++) { + /* See also vmbus_reset_channel_cb(). */ + napi_disable(&net_device->chan_table[i].napi); + netif_napi_del(&net_device->chan_table[i].napi); + } + + /* + * At this point, no one should be accessing net_device + * except in here + */ + netdev_dbg(ndev, "net device safe to remove\n"); + + /* Now, we can close the channel safely */ + vmbus_close(device->channel); + + /* + * If host is Win2016 or higher then we do the GPADL tear down + * here after VMBus is closed. + */ + if (vmbus_proto_version >= VERSION_WIN10) { + netvsc_teardown_recv_gpadl(device, net_device, ndev); + netvsc_teardown_send_gpadl(device, net_device, ndev); + } + + /* Release all resources */ + free_netvsc_device_rcu(net_device); +} + +#define RING_AVAIL_PERCENT_HIWATER 20 +#define RING_AVAIL_PERCENT_LOWATER 10 + +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_tx_complete(struct net_device *ndev, + struct netvsc_device *net_device, + struct vmbus_channel *channel, + const struct vmpacket_descriptor *desc, + int budget) +{ + struct sk_buff *skb = (struct sk_buff *)(unsigned long)desc->trans_id; + struct net_device_context *ndev_ctx = netdev_priv(ndev); + u16 q_idx = 0; + int queue_sends; + + /* Notify the layer above us */ + if (likely(skb)) { + const struct hv_netvsc_packet *packet + = (struct hv_netvsc_packet *)skb->cb; + u32 send_index = packet->send_buf_index; + struct netvsc_stats *tx_stats; + + if (send_index != NETVSC_INVALID_INDEX) + netvsc_free_send_slot(net_device, send_index); + q_idx = packet->q_idx; + + tx_stats = &net_device->chan_table[q_idx].tx_stats; + + u64_stats_update_begin(&tx_stats->syncp); + tx_stats->packets += packet->total_packets; + tx_stats->bytes += packet->total_bytes; + u64_stats_update_end(&tx_stats->syncp); + + napi_consume_skb(skb, budget); + } + + queue_sends = + atomic_dec_return(&net_device->chan_table[q_idx].queue_sends); + + if (unlikely(net_device->destroy)) { + if (queue_sends == 0) + wake_up(&net_device->wait_drain); + } else { + struct netdev_queue *txq = netdev_get_tx_queue(ndev, q_idx); + + if (netif_tx_queue_stopped(txq) && !net_device->tx_disable && + (hv_get_avail_to_write_percent(&channel->outbound) > + RING_AVAIL_PERCENT_HIWATER || queue_sends < 1)) { + netif_tx_wake_queue(txq); + ndev_ctx->eth_stats.wake_queue++; + } + } +} + +static void netvsc_send_completion(struct net_device *ndev, + struct netvsc_device *net_device, + struct vmbus_channel *incoming_channel, + const struct vmpacket_descriptor *desc, + int budget) +{ + const struct nvsp_message *nvsp_packet = hv_pkt_data(desc); + u32 msglen = hv_pkt_datalen(desc); + + /* Ensure packet is big enough to read header fields */ + if (msglen < sizeof(struct nvsp_message_header)) { + netdev_err(ndev, "nvsp_message length too small: %u\n", msglen); + return; + } + + switch (nvsp_packet->hdr.msg_type) { + case NVSP_MSG_TYPE_INIT_COMPLETE: + if (msglen < sizeof(struct nvsp_message_header) + + sizeof(struct nvsp_message_init_complete)) { + netdev_err(ndev, "nvsp_msg length too small: %u\n", + msglen); + return; + } + fallthrough; + + case NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE: + if (msglen < sizeof(struct nvsp_message_header) + + sizeof(struct nvsp_1_message_send_receive_buffer_complete)) { + netdev_err(ndev, "nvsp_msg1 length too small: %u\n", + msglen); + return; + } + fallthrough; + + case NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE: + if (msglen < sizeof(struct nvsp_message_header) + + sizeof(struct nvsp_1_message_send_send_buffer_complete)) { + netdev_err(ndev, "nvsp_msg1 length too small: %u\n", + msglen); + return; + } + fallthrough; + + case NVSP_MSG5_TYPE_SUBCHANNEL: + if (msglen < sizeof(struct nvsp_message_header) + + sizeof(struct nvsp_5_subchannel_complete)) { + netdev_err(ndev, "nvsp_msg5 length too small: %u\n", + msglen); + return; + } + /* Copy the response back */ + memcpy(&net_device->channel_init_pkt, nvsp_packet, + sizeof(struct nvsp_message)); + complete(&net_device->channel_init_wait); + break; + + case NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE: + netvsc_send_tx_complete(ndev, net_device, incoming_channel, + desc, budget); + break; + + default: + netdev_err(ndev, + "Unknown send completion type %d received!!\n", + nvsp_packet->hdr.msg_type); + } +} + +static u32 netvsc_get_next_send_section(struct netvsc_device *net_device) +{ + unsigned long *map_addr = net_device->send_section_map; + unsigned int i; + + for_each_clear_bit(i, map_addr, net_device->send_section_cnt) { + if (sync_test_and_set_bit(i, map_addr) == 0) + return i; + } + + return NETVSC_INVALID_INDEX; +} + +static void netvsc_copy_to_send_buf(struct netvsc_device *net_device, + unsigned int section_index, + u32 pend_size, + struct hv_netvsc_packet *packet, + struct rndis_message *rndis_msg, + struct hv_page_buffer *pb, + bool xmit_more) +{ + char *start = net_device->send_buf; + char *dest = start + (section_index * net_device->send_section_size) + + pend_size; + int i; + u32 padding = 0; + u32 page_count = packet->cp_partial ? packet->rmsg_pgcnt : + packet->page_buf_cnt; + u32 remain; + + /* Add padding */ + remain = packet->total_data_buflen & (net_device->pkt_align - 1); + if (xmit_more && remain) { + padding = net_device->pkt_align - remain; + rndis_msg->msg_len += padding; + packet->total_data_buflen += padding; + } + + for (i = 0; i < page_count; i++) { + char *src = phys_to_virt(pb[i].pfn << HV_HYP_PAGE_SHIFT); + u32 offset = pb[i].offset; + u32 len = pb[i].len; + + memcpy(dest, (src + offset), len); + dest += len; + } + + if (padding) + memset(dest, 0, padding); +} + +static inline int netvsc_send_pkt( + struct hv_device *device, + struct hv_netvsc_packet *packet, + struct netvsc_device *net_device, + struct hv_page_buffer *pb, + struct sk_buff *skb) +{ + struct nvsp_message nvmsg; + struct nvsp_1_message_send_rndis_packet *rpkt = + &nvmsg.msg.v1_msg.send_rndis_pkt; + struct netvsc_channel * const nvchan = + &net_device->chan_table[packet->q_idx]; + struct vmbus_channel *out_channel = nvchan->channel; + struct net_device *ndev = hv_get_drvdata(device); + struct net_device_context *ndev_ctx = netdev_priv(ndev); + struct netdev_queue *txq = netdev_get_tx_queue(ndev, packet->q_idx); + u64 req_id; + int ret; + u32 ring_avail = hv_get_avail_to_write_percent(&out_channel->outbound); + + nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT; + if (skb) + rpkt->channel_type = 0; /* 0 is RMC_DATA */ + else + rpkt->channel_type = 1; /* 1 is RMC_CONTROL */ + + rpkt->send_buf_section_index = packet->send_buf_index; + if (packet->send_buf_index == NETVSC_INVALID_INDEX) + rpkt->send_buf_section_size = 0; + else + rpkt->send_buf_section_size = packet->total_data_buflen; + + req_id = (ulong)skb; + + if (out_channel->rescind) + return -ENODEV; + + trace_nvsp_send_pkt(ndev, out_channel, rpkt); + + if (packet->page_buf_cnt) { + if (packet->cp_partial) + pb += packet->rmsg_pgcnt; + + ret = vmbus_sendpacket_pagebuffer(out_channel, + pb, packet->page_buf_cnt, + &nvmsg, sizeof(nvmsg), + req_id); + } else { + ret = vmbus_sendpacket(out_channel, + &nvmsg, sizeof(nvmsg), + req_id, VM_PKT_DATA_INBAND, + VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); + } + + if (ret == 0) { + atomic_inc_return(&nvchan->queue_sends); + + if (ring_avail < RING_AVAIL_PERCENT_LOWATER) { + netif_tx_stop_queue(txq); + ndev_ctx->eth_stats.stop_queue++; + } + } else if (ret == -EAGAIN) { + netif_tx_stop_queue(txq); + ndev_ctx->eth_stats.stop_queue++; + } else { + netdev_err(ndev, + "Unable to send packet pages %u len %u, ret %d\n", + packet->page_buf_cnt, packet->total_data_buflen, + ret); + } + + if (netif_tx_queue_stopped(txq) && + atomic_read(&nvchan->queue_sends) < 1 && + !net_device->tx_disable) { + netif_tx_wake_queue(txq); + ndev_ctx->eth_stats.wake_queue++; + if (ret == -EAGAIN) + ret = -ENOSPC; + } + + return ret; +} + +/* Move packet out of multi send data (msd), and clear msd */ +static inline void move_pkt_msd(struct hv_netvsc_packet **msd_send, + struct sk_buff **msd_skb, + struct multi_send_data *msdp) +{ + *msd_skb = msdp->skb; + *msd_send = msdp->pkt; + msdp->skb = NULL; + msdp->pkt = NULL; + msdp->count = 0; +} + +/* RCU already held by caller */ +int netvsc_send(struct net_device *ndev, + struct hv_netvsc_packet *packet, + struct rndis_message *rndis_msg, + struct hv_page_buffer *pb, + struct sk_buff *skb, + bool xdp_tx) +{ + struct net_device_context *ndev_ctx = netdev_priv(ndev); + struct netvsc_device *net_device + = rcu_dereference_bh(ndev_ctx->nvdev); + struct hv_device *device = ndev_ctx->device_ctx; + int ret = 0; + struct netvsc_channel *nvchan; + u32 pktlen = packet->total_data_buflen, msd_len = 0; + unsigned int section_index = NETVSC_INVALID_INDEX; + struct multi_send_data *msdp; + struct hv_netvsc_packet *msd_send = NULL, *cur_send = NULL; + struct sk_buff *msd_skb = NULL; + bool try_batch, xmit_more; + + /* If device is rescinded, return error and packet will get dropped. */ + if (unlikely(!net_device || net_device->destroy)) + return -ENODEV; + + nvchan = &net_device->chan_table[packet->q_idx]; + packet->send_buf_index = NETVSC_INVALID_INDEX; + packet->cp_partial = false; + + /* Send a control message or XDP packet directly without accessing + * msd (Multi-Send Data) field which may be changed during data packet + * processing. + */ + if (!skb || xdp_tx) + return netvsc_send_pkt(device, packet, net_device, pb, skb); + + /* batch packets in send buffer if possible */ + msdp = &nvchan->msd; + if (msdp->pkt) + msd_len = msdp->pkt->total_data_buflen; + + try_batch = 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 (pktlen + net_device->pkt_align < + net_device->send_section_size) { + section_index = netvsc_get_next_send_section(net_device); + if (unlikely(section_index == NETVSC_INVALID_INDEX)) { + ++ndev_ctx->eth_stats.tx_send_full; + } else { + move_pkt_msd(&msd_send, &msd_skb, msdp); + msd_len = 0; + } + } + + /* Keep aggregating only if stack says more data is coming + * and not doing mixed modes send and not flow blocked + */ + xmit_more = netdev_xmit_more() && + !packet->cp_partial && + !netif_xmit_stopped(netdev_get_tx_queue(ndev, packet->q_idx)); + + if (section_index != NETVSC_INVALID_INDEX) { + netvsc_copy_to_send_buf(net_device, + section_index, msd_len, + packet, rndis_msg, pb, xmit_more); + + 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) { + packet->total_packets += msdp->pkt->total_packets; + packet->total_bytes += msdp->pkt->total_bytes; + } + + if (msdp->skb) + dev_consume_skb_any(msdp->skb); + + if (xmit_more) { + msdp->skb = skb; + msdp->pkt = packet; + msdp->count++; + } else { + cur_send = packet; + msdp->skb = NULL; + msdp->pkt = NULL; + msdp->count = 0; + } + } else { + move_pkt_msd(&msd_send, &msd_skb, msdp); + cur_send = packet; + } + + if (msd_send) { + int m_ret = netvsc_send_pkt(device, msd_send, net_device, + NULL, msd_skb); + + if (m_ret != 0) { + netvsc_free_send_slot(net_device, + msd_send->send_buf_index); + dev_kfree_skb_any(msd_skb); + } + } + + if (cur_send) + ret = netvsc_send_pkt(device, cur_send, net_device, pb, skb); + + if (ret != 0 && section_index != NETVSC_INVALID_INDEX) + netvsc_free_send_slot(net_device, section_index); + + return ret; +} + +/* Send pending recv completions */ +static int send_recv_completions(struct net_device *ndev, + struct netvsc_device *nvdev, + struct netvsc_channel *nvchan) +{ + struct multi_recv_comp *mrc = &nvchan->mrc; + struct recv_comp_msg { + struct nvsp_message_header hdr; + u32 status; + } __packed; + struct recv_comp_msg msg = { + .hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE, + }; + int ret; + + while (mrc->first != mrc->next) { + const struct recv_comp_data *rcd + = mrc->slots + mrc->first; + + msg.status = rcd->status; + ret = vmbus_sendpacket(nvchan->channel, &msg, sizeof(msg), + rcd->tid, VM_PKT_COMP, 0); + if (unlikely(ret)) { + struct net_device_context *ndev_ctx = netdev_priv(ndev); + + ++ndev_ctx->eth_stats.rx_comp_busy; + return ret; + } + + if (++mrc->first == nvdev->recv_completion_cnt) + mrc->first = 0; + } + + /* receive completion ring has been emptied */ + if (unlikely(nvdev->destroy)) + wake_up(&nvdev->wait_drain); + + return 0; +} + +/* Count how many receive completions are outstanding */ +static void recv_comp_slot_avail(const struct netvsc_device *nvdev, + const struct multi_recv_comp *mrc, + u32 *filled, u32 *avail) +{ + u32 count = nvdev->recv_completion_cnt; + + if (mrc->next >= mrc->first) + *filled = mrc->next - mrc->first; + else + *filled = (count - mrc->first) + mrc->next; + + *avail = count - *filled - 1; +} + +/* Add receive complete to ring to send to host. */ +static void enq_receive_complete(struct net_device *ndev, + struct netvsc_device *nvdev, u16 q_idx, + u64 tid, u32 status) +{ + struct netvsc_channel *nvchan = &nvdev->chan_table[q_idx]; + struct multi_recv_comp *mrc = &nvchan->mrc; + struct recv_comp_data *rcd; + u32 filled, avail; + + recv_comp_slot_avail(nvdev, mrc, &filled, &avail); + + if (unlikely(filled > NAPI_POLL_WEIGHT)) { + send_recv_completions(ndev, nvdev, nvchan); + recv_comp_slot_avail(nvdev, mrc, &filled, &avail); + } + + if (unlikely(!avail)) { + netdev_err(ndev, "Recv_comp full buf q:%hd, tid:%llx\n", + q_idx, tid); + return; + } + + rcd = mrc->slots + mrc->next; + rcd->tid = tid; + rcd->status = status; + + if (++mrc->next == nvdev->recv_completion_cnt) + mrc->next = 0; +} + +static int netvsc_receive(struct net_device *ndev, + struct netvsc_device *net_device, + struct netvsc_channel *nvchan, + const struct vmpacket_descriptor *desc) +{ + struct net_device_context *net_device_ctx = netdev_priv(ndev); + struct vmbus_channel *channel = nvchan->channel; + const struct vmtransfer_page_packet_header *vmxferpage_packet + = container_of(desc, const struct vmtransfer_page_packet_header, d); + const struct nvsp_message *nvsp = hv_pkt_data(desc); + u32 msglen = hv_pkt_datalen(desc); + u16 q_idx = channel->offermsg.offer.sub_channel_index; + char *recv_buf = net_device->recv_buf; + u32 status = NVSP_STAT_SUCCESS; + int i; + int count = 0; + + /* Ensure packet is big enough to read header fields */ + if (msglen < sizeof(struct nvsp_message_header)) { + netif_err(net_device_ctx, rx_err, ndev, + "invalid nvsp header, length too small: %u\n", + msglen); + return 0; + } + + /* Make sure this is a valid nvsp packet */ + if (unlikely(nvsp->hdr.msg_type != NVSP_MSG1_TYPE_SEND_RNDIS_PKT)) { + netif_err(net_device_ctx, rx_err, ndev, + "Unknown nvsp packet type received %u\n", + nvsp->hdr.msg_type); + return 0; + } + + /* Validate xfer page pkt header */ + if ((desc->offset8 << 3) < sizeof(struct vmtransfer_page_packet_header)) { + netif_err(net_device_ctx, rx_err, ndev, + "Invalid xfer page pkt, offset too small: %u\n", + desc->offset8 << 3); + return 0; + } + + if (unlikely(vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID)) { + netif_err(net_device_ctx, rx_err, ndev, + "Invalid xfer page set id - expecting %x got %x\n", + NETVSC_RECEIVE_BUFFER_ID, + vmxferpage_packet->xfer_pageset_id); + return 0; + } + + count = vmxferpage_packet->range_cnt; + + /* Check count for a valid value */ + if (NETVSC_XFER_HEADER_SIZE(count) > desc->offset8 << 3) { + netif_err(net_device_ctx, rx_err, ndev, + "Range count is not valid: %d\n", + count); + return 0; + } + + /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */ + for (i = 0; i < count; i++) { + u32 offset = vmxferpage_packet->ranges[i].byte_offset; + u32 buflen = vmxferpage_packet->ranges[i].byte_count; + void *data; + int ret; + + if (unlikely(offset > net_device->recv_buf_size || + buflen > net_device->recv_buf_size - offset)) { + nvchan->rsc.cnt = 0; + status = NVSP_STAT_FAIL; + netif_err(net_device_ctx, rx_err, ndev, + "Packet offset:%u + len:%u too big\n", + offset, buflen); + + continue; + } + + data = recv_buf + offset; + + nvchan->rsc.is_last = (i == count - 1); + + trace_rndis_recv(ndev, q_idx, data); + + /* Pass it to the upper layer */ + ret = rndis_filter_receive(ndev, net_device, + nvchan, data, buflen); + + if (unlikely(ret != NVSP_STAT_SUCCESS)) { + /* Drop incomplete packet */ + nvchan->rsc.cnt = 0; + status = NVSP_STAT_FAIL; + } + } + + enq_receive_complete(ndev, net_device, q_idx, + vmxferpage_packet->d.trans_id, status); + + return count; +} + +static void netvsc_send_table(struct net_device *ndev, + struct netvsc_device *nvscdev, + const struct nvsp_message *nvmsg, + u32 msglen) +{ + struct net_device_context *net_device_ctx = netdev_priv(ndev); + u32 count, offset, *tab; + int i; + + /* Ensure packet is big enough to read send_table fields */ + if (msglen < sizeof(struct nvsp_message_header) + + sizeof(struct nvsp_5_send_indirect_table)) { + netdev_err(ndev, "nvsp_v5_msg length too small: %u\n", msglen); + return; + } + + count = nvmsg->msg.v5_msg.send_table.count; + offset = nvmsg->msg.v5_msg.send_table.offset; + + if (count != VRSS_SEND_TAB_SIZE) { + netdev_err(ndev, "Received wrong send-table size:%u\n", count); + return; + } + + /* If negotiated version <= NVSP_PROTOCOL_VERSION_6, the offset may be + * wrong due to a host bug. So fix the offset here. + */ + if (nvscdev->nvsp_version <= NVSP_PROTOCOL_VERSION_6 && + msglen >= sizeof(struct nvsp_message_header) + + sizeof(union nvsp_6_message_uber) + count * sizeof(u32)) + offset = sizeof(struct nvsp_message_header) + + sizeof(union nvsp_6_message_uber); + + /* Boundary check for all versions */ + if (offset > msglen - count * sizeof(u32)) { + netdev_err(ndev, "Received send-table offset too big:%u\n", + offset); + return; + } + + tab = (void *)nvmsg + offset; + + for (i = 0; i < count; i++) + net_device_ctx->tx_table[i] = tab[i]; +} + +static void netvsc_send_vf(struct net_device *ndev, + const struct nvsp_message *nvmsg, + u32 msglen) +{ + struct net_device_context *net_device_ctx = netdev_priv(ndev); + + /* Ensure packet is big enough to read its fields */ + if (msglen < sizeof(struct nvsp_message_header) + + sizeof(struct nvsp_4_send_vf_association)) { + netdev_err(ndev, "nvsp_v4_msg length too small: %u\n", msglen); + return; + } + + net_device_ctx->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated; + net_device_ctx->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial; + + if (net_device_ctx->vf_alloc) + complete(&net_device_ctx->vf_add); + + netdev_info(ndev, "VF slot %u %s\n", + net_device_ctx->vf_serial, + net_device_ctx->vf_alloc ? "added" : "removed"); +} + +static void netvsc_receive_inband(struct net_device *ndev, + struct netvsc_device *nvscdev, + const struct vmpacket_descriptor *desc) +{ + const struct nvsp_message *nvmsg = hv_pkt_data(desc); + u32 msglen = hv_pkt_datalen(desc); + + /* Ensure packet is big enough to read header fields */ + if (msglen < sizeof(struct nvsp_message_header)) { + netdev_err(ndev, "inband nvsp_message length too small: %u\n", msglen); + return; + } + + switch (nvmsg->hdr.msg_type) { + case NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE: + netvsc_send_table(ndev, nvscdev, nvmsg, msglen); + break; + + case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION: + netvsc_send_vf(ndev, nvmsg, msglen); + break; + } +} + +static int netvsc_process_raw_pkt(struct hv_device *device, + struct netvsc_channel *nvchan, + struct netvsc_device *net_device, + struct net_device *ndev, + const struct vmpacket_descriptor *desc, + int budget) +{ + struct vmbus_channel *channel = nvchan->channel; + const struct nvsp_message *nvmsg = hv_pkt_data(desc); + + trace_nvsp_recv(ndev, channel, nvmsg); + + switch (desc->type) { + case VM_PKT_COMP: + netvsc_send_completion(ndev, net_device, channel, desc, budget); + break; + + case VM_PKT_DATA_USING_XFER_PAGES: + return netvsc_receive(ndev, net_device, nvchan, desc); + break; + + case VM_PKT_DATA_INBAND: + netvsc_receive_inband(ndev, net_device, desc); + break; + + default: + netdev_err(ndev, "unhandled packet type %d, tid %llx\n", + desc->type, desc->trans_id); + break; + } + + return 0; +} + +static struct hv_device *netvsc_channel_to_device(struct vmbus_channel *channel) +{ + struct vmbus_channel *primary = channel->primary_channel; + + return primary ? primary->device_obj : channel->device_obj; +} + +/* Network processing softirq + * Process data in incoming ring buffer from host + * Stops when ring is empty or budget is met or exceeded. + */ +int netvsc_poll(struct napi_struct *napi, int budget) +{ + struct netvsc_channel *nvchan + = container_of(napi, struct netvsc_channel, napi); + struct netvsc_device *net_device = nvchan->net_device; + struct vmbus_channel *channel = nvchan->channel; + struct hv_device *device = netvsc_channel_to_device(channel); + struct net_device *ndev = hv_get_drvdata(device); + int work_done = 0; + int ret; + + /* If starting a new interval */ + if (!nvchan->desc) + nvchan->desc = hv_pkt_iter_first(channel); + + while (nvchan->desc && work_done < budget) { + work_done += netvsc_process_raw_pkt(device, nvchan, net_device, + ndev, nvchan->desc, budget); + nvchan->desc = hv_pkt_iter_next(channel, nvchan->desc); + } + + /* Send any pending receive completions */ + ret = send_recv_completions(ndev, net_device, nvchan); + + /* If it did not exhaust NAPI budget this time + * and not doing busy poll + * then re-enable host interrupts + * and reschedule if ring is not empty + * or sending receive completion failed. + */ + if (work_done < budget && + napi_complete_done(napi, work_done) && + (ret || hv_end_read(&channel->inbound)) && + napi_schedule_prep(napi)) { + hv_begin_read(&channel->inbound); + __napi_schedule(napi); + } + + /* Driver may overshoot since multiple packets per descriptor */ + return min(work_done, budget); +} + +/* Call back when data is available in host ring buffer. + * Processing is deferred until network softirq (NAPI) + */ +void netvsc_channel_cb(void *context) +{ + struct netvsc_channel *nvchan = context; + struct vmbus_channel *channel = nvchan->channel; + struct hv_ring_buffer_info *rbi = &channel->inbound; + + /* preload first vmpacket descriptor */ + prefetch(hv_get_ring_buffer(rbi) + rbi->priv_read_index); + + if (napi_schedule_prep(&nvchan->napi)) { + /* disable interrupts from host */ + hv_begin_read(rbi); + + __napi_schedule_irqoff(&nvchan->napi); + } +} + +/* + * netvsc_device_add - Callback when the device belonging to this + * driver is added + */ +struct netvsc_device *netvsc_device_add(struct hv_device *device, + const struct netvsc_device_info *device_info) +{ + int i, ret = 0; + struct netvsc_device *net_device; + struct net_device *ndev = hv_get_drvdata(device); + struct net_device_context *net_device_ctx = netdev_priv(ndev); + + net_device = alloc_net_device(); + if (!net_device) + return ERR_PTR(-ENOMEM); + + for (i = 0; i < VRSS_SEND_TAB_SIZE; i++) + net_device_ctx->tx_table[i] = 0; + + /* Because the device uses NAPI, all the interrupt batching and + * control is done via Net softirq, not the channel handling + */ + set_channel_read_mode(device->channel, HV_CALL_ISR); + + /* If we're reopening the device we may have multiple queues, fill the + * chn_table with the default channel to use it before subchannels are + * opened. + * Initialize the channel state before we open; + * we can be interrupted as soon as we open the channel. + */ + + for (i = 0; i < VRSS_CHANNEL_MAX; i++) { + struct netvsc_channel *nvchan = &net_device->chan_table[i]; + + nvchan->channel = device->channel; + nvchan->net_device = net_device; + u64_stats_init(&nvchan->tx_stats.syncp); + u64_stats_init(&nvchan->rx_stats.syncp); + + ret = xdp_rxq_info_reg(&nvchan->xdp_rxq, ndev, i); + + if (ret) { + netdev_err(ndev, "xdp_rxq_info_reg fail: %d\n", ret); + goto cleanup2; + } + + ret = xdp_rxq_info_reg_mem_model(&nvchan->xdp_rxq, + MEM_TYPE_PAGE_SHARED, NULL); + + if (ret) { + netdev_err(ndev, "xdp reg_mem_model fail: %d\n", ret); + goto cleanup2; + } + } + + /* Enable NAPI handler before init callbacks */ + netif_napi_add(ndev, &net_device->chan_table[0].napi, + netvsc_poll, NAPI_POLL_WEIGHT); + + /* Open the channel */ + ret = vmbus_open(device->channel, netvsc_ring_bytes, + netvsc_ring_bytes, NULL, 0, + netvsc_channel_cb, net_device->chan_table); + + if (ret != 0) { + netdev_err(ndev, "unable to open channel: %d\n", ret); + goto cleanup; + } + + /* Channel is opened */ + netdev_dbg(ndev, "hv_netvsc channel opened successfully\n"); + + napi_enable(&net_device->chan_table[0].napi); + + /* Connect with the NetVsp */ + ret = netvsc_connect_vsp(device, net_device, device_info); + if (ret != 0) { + netdev_err(ndev, + "unable to connect to NetVSP - %d\n", ret); + goto close; + } + + /* Writing nvdev pointer unlocks netvsc_send(), make sure chn_table is + * populated. + */ + rcu_assign_pointer(net_device_ctx->nvdev, net_device); + + return net_device; + +close: + RCU_INIT_POINTER(net_device_ctx->nvdev, NULL); + napi_disable(&net_device->chan_table[0].napi); + + /* Now, we can close the channel safely */ + vmbus_close(device->channel); + +cleanup: + netif_napi_del(&net_device->chan_table[0].napi); + +cleanup2: + free_netvsc_device(&net_device->rcu); + + return ERR_PTR(ret); +} |