/* * 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 . * * Authors: * Haiyang Zhang * Hank Janssen */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include #include #include #include #include #include #include #include #include #include #include #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); 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; 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 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 = net_device->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; 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 vmbus_channel *incoming_channel, 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; struct sk_buff *skb; 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 */ skb = (struct sk_buff *)(unsigned long)packet->trans_id; /* Notify the layer above us */ if (skb) { nvsc_packet = (struct hv_netvsc_packet *) skb->cb; 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 = incoming_channel; dev_kfree_skb_any(skb); } 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, struct rndis_message *rndis_msg, struct hv_page_buffer **pb, struct sk_buff *skb) { char *start = net_device->send_buf; char *dest = start + (section_index * net_device->send_section_size) + pend_size; int i; bool is_data_pkt = (skb != NULL) ? true : false; bool xmit_more = (skb != NULL) ? skb->xmit_more : false; 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 (is_data_pkt && xmit_more && remain && !packet->cp_partial) { 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 << PAGE_SHIFT); u32 offset = (*pb)[i].offset; u32 len = (*pb)[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 hv_page_buffer **pb, struct sk_buff *skb) { struct nvsp_message nvmsg; u16 q_idx = packet->q_idx; struct vmbus_channel *out_channel = net_device->chn_table[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); bool xmit_more = (skb != NULL) ? skb->xmit_more : false; nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT; if (skb != NULL) { /* 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; req_id = (ulong)skb; 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)) xmit_more = false; if (packet->page_buf_cnt) { pgbuf = packet->cp_partial ? (*pb) + packet->rmsg_pgcnt : (*pb); 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, !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, !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 rndis_message *rndis_msg, struct hv_page_buffer **pb, struct sk_buff *skb) { 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; struct multi_send_data *msdp; struct hv_netvsc_packet *msd_send = NULL, *cur_send = NULL; bool try_batch; bool xmit_more = (skb != NULL) ? skb->xmit_more : false; net_device = get_outbound_net_device(device); if (!net_device) return -ENODEV; out_channel = net_device->chn_table[q_idx]; packet->send_buf_index = NETVSC_INVALID_INDEX; packet->cp_partial = false; msdp = &net_device->msd[q_idx]; /* batch packets in send buffer if possible */ if (msdp->pkt) msd_len = msdp->pkt->total_data_buflen; try_batch = (skb != NULL) && 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 ((skb != NULL) && 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, rndis_msg, pb, skb); 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) dev_kfree_skb_any(skb); if (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; } if (msd_send) { m_ret = netvsc_send_pkt(msd_send, net_device, pb, skb); if (m_ret != 0) { netvsc_free_send_slot(net_device, msd_send->send_buf_index); dev_kfree_skb_any(skb); } } if (cur_send) ret = netvsc_send_pkt(cur_send, net_device, pb, skb); 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; void *data; 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; /* 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; 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, &data, channel); 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 nvsp_message *nvmsg) { struct netvsc_device *nvscdev; struct net_device *ndev; int i; u32 count, *tab; nvscdev = get_outbound_net_device(hdev); if (!nvscdev) return; ndev = nvscdev->ndev; 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]; } static void netvsc_send_vf(struct netvsc_device *nvdev, struct nvsp_message *nvmsg) { nvdev->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated; nvdev->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial; } static inline void netvsc_receive_inband(struct hv_device *hdev, struct netvsc_device *nvdev, struct nvsp_message *nvmsg) { switch (nvmsg->hdr.msg_type) { case NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE: netvsc_send_table(hdev, nvmsg); break; case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION: netvsc_send_vf(nvdev, nvmsg); break; } } 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; struct nvsp_message *nvmsg; 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; nvmsg = (struct nvsp_message *)((unsigned long) desc + (desc->offset8 << 3)); switch (desc->type) { case VM_PKT_COMP: netvsc_send_completion(net_device, channel, device, desc); break; case VM_PKT_DATA_USING_XFER_PAGES: netvsc_receive(net_device, channel, device, desc); break; case VM_PKT_DATA_INBAND: netvsc_receive_inband(device, net_device, nvmsg); 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; }