19952f691SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 295fa0405SHaiyang Zhang /* 395fa0405SHaiyang Zhang * Copyright (c) 2009, Microsoft Corporation. 495fa0405SHaiyang Zhang * 595fa0405SHaiyang Zhang * Authors: 695fa0405SHaiyang Zhang * Haiyang Zhang <haiyangz@microsoft.com> 795fa0405SHaiyang Zhang * Hank Janssen <hjanssen@microsoft.com> 895fa0405SHaiyang Zhang */ 995fa0405SHaiyang Zhang #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 1095fa0405SHaiyang Zhang 1195fa0405SHaiyang Zhang #include <linux/kernel.h> 1295fa0405SHaiyang Zhang #include <linux/sched.h> 1395fa0405SHaiyang Zhang #include <linux/wait.h> 1495fa0405SHaiyang Zhang #include <linux/mm.h> 1595fa0405SHaiyang Zhang #include <linux/delay.h> 1695fa0405SHaiyang Zhang #include <linux/io.h> 1795fa0405SHaiyang Zhang #include <linux/slab.h> 1895fa0405SHaiyang Zhang #include <linux/netdevice.h> 19f157e78dSHaiyang Zhang #include <linux/if_ether.h> 20d6472302SStephen Rothwell #include <linux/vmalloc.h> 219749fed5Sstephen hemminger #include <linux/rtnetlink.h> 2243bf99ceSstephen hemminger #include <linux/prefetch.h> 239749fed5Sstephen hemminger 24c25aaf81SKY Srinivasan #include <asm/sync_bitops.h> 2596854bbdSAndrea Parri (Microsoft) #include <asm/mshyperv.h> 2695fa0405SHaiyang Zhang 2795fa0405SHaiyang Zhang #include "hyperv_net.h" 28ec966381SStephen Hemminger #include "netvsc_trace.h" 2995fa0405SHaiyang Zhang 3084bf9cefSKY Srinivasan /* 3184bf9cefSKY Srinivasan * Switch the data path from the synthetic interface to the VF 3284bf9cefSKY Srinivasan * interface. 3384bf9cefSKY Srinivasan */ 34d0922bf7SHaiyang Zhang int netvsc_switch_datapath(struct net_device *ndev, bool vf) 3584bf9cefSKY Srinivasan { 363d541ac5SVitaly Kuznetsov struct net_device_context *net_device_ctx = netdev_priv(ndev); 373d541ac5SVitaly Kuznetsov struct hv_device *dev = net_device_ctx->device_ctx; 3879e8cbe7Sstephen hemminger struct netvsc_device *nv_dev = rtnl_dereference(net_device_ctx->nvdev); 390a1275caSVitaly Kuznetsov struct nvsp_message *init_pkt = &nv_dev->channel_init_pkt; 40d0922bf7SHaiyang Zhang int ret, retry = 0; 4184bf9cefSKY Srinivasan 428b31f8c9SLong Li /* Block sending traffic to VF if it's about to be gone */ 438b31f8c9SLong Li if (!vf) 448b31f8c9SLong Li net_device_ctx->data_path_is_vf = vf; 458b31f8c9SLong Li 4684bf9cefSKY Srinivasan memset(init_pkt, 0, sizeof(struct nvsp_message)); 4784bf9cefSKY Srinivasan init_pkt->hdr.msg_type = NVSP_MSG4_TYPE_SWITCH_DATA_PATH; 4884bf9cefSKY Srinivasan if (vf) 4984bf9cefSKY Srinivasan init_pkt->msg.v4_msg.active_dp.active_datapath = 5084bf9cefSKY Srinivasan NVSP_DATAPATH_VF; 5184bf9cefSKY Srinivasan else 5284bf9cefSKY Srinivasan init_pkt->msg.v4_msg.active_dp.active_datapath = 5384bf9cefSKY Srinivasan NVSP_DATAPATH_SYNTHETIC; 5484bf9cefSKY Srinivasan 55d0922bf7SHaiyang Zhang again: 56ec966381SStephen Hemminger trace_nvsp_send(ndev, init_pkt); 57ec966381SStephen Hemminger 58d0922bf7SHaiyang Zhang ret = vmbus_sendpacket(dev->channel, init_pkt, 5984bf9cefSKY Srinivasan sizeof(struct nvsp_message), 60d0922bf7SHaiyang Zhang (unsigned long)init_pkt, VM_PKT_DATA_INBAND, 618b31f8c9SLong Li VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 62d0922bf7SHaiyang Zhang 63d0922bf7SHaiyang Zhang /* If failed to switch to/from VF, let data_path_is_vf stay false, 64d0922bf7SHaiyang Zhang * so we use synthetic path to send data. 65d0922bf7SHaiyang Zhang */ 66d0922bf7SHaiyang Zhang if (ret) { 67d0922bf7SHaiyang Zhang if (ret != -EAGAIN) { 68d0922bf7SHaiyang Zhang netdev_err(ndev, 69d0922bf7SHaiyang Zhang "Unable to send sw datapath msg, err: %d\n", 70d0922bf7SHaiyang Zhang ret); 71d0922bf7SHaiyang Zhang return ret; 72d0922bf7SHaiyang Zhang } 73d0922bf7SHaiyang Zhang 74d0922bf7SHaiyang Zhang if (retry++ < RETRY_MAX) { 75d0922bf7SHaiyang Zhang usleep_range(RETRY_US_LO, RETRY_US_HI); 76d0922bf7SHaiyang Zhang goto again; 77d0922bf7SHaiyang Zhang } else { 78d0922bf7SHaiyang Zhang netdev_err( 79d0922bf7SHaiyang Zhang ndev, 80d0922bf7SHaiyang Zhang "Retry failed to send sw datapath msg, err: %d\n", 81d0922bf7SHaiyang Zhang ret); 82d0922bf7SHaiyang Zhang return ret; 83d0922bf7SHaiyang Zhang } 84d0922bf7SHaiyang Zhang } 85d0922bf7SHaiyang Zhang 868b31f8c9SLong Li wait_for_completion(&nv_dev->channel_init_wait); 878b31f8c9SLong Li net_device_ctx->data_path_is_vf = vf; 88d0922bf7SHaiyang Zhang 89d0922bf7SHaiyang Zhang return 0; 9084bf9cefSKY Srinivasan } 9184bf9cefSKY Srinivasan 923ffe64f1SStephen Hemminger /* Worker to setup sub channels on initial setup 933ffe64f1SStephen Hemminger * Initial hotplug event occurs in softirq context 943ffe64f1SStephen Hemminger * and can't wait for channels. 953ffe64f1SStephen Hemminger */ 963ffe64f1SStephen Hemminger static void netvsc_subchan_work(struct work_struct *w) 973ffe64f1SStephen Hemminger { 983ffe64f1SStephen Hemminger struct netvsc_device *nvdev = 993ffe64f1SStephen Hemminger container_of(w, struct netvsc_device, subchan_work); 1003ffe64f1SStephen Hemminger struct rndis_device *rdev; 1013ffe64f1SStephen Hemminger int i, ret; 1023ffe64f1SStephen Hemminger 1033ffe64f1SStephen Hemminger /* Avoid deadlock with device removal already under RTNL */ 1043ffe64f1SStephen Hemminger if (!rtnl_trylock()) { 1053ffe64f1SStephen Hemminger schedule_work(w); 1063ffe64f1SStephen Hemminger return; 1073ffe64f1SStephen Hemminger } 1083ffe64f1SStephen Hemminger 1093ffe64f1SStephen Hemminger rdev = nvdev->extension; 1103ffe64f1SStephen Hemminger if (rdev) { 11117d91256SHaiyang Zhang ret = rndis_set_subchannel(rdev->ndev, nvdev, NULL); 1123ffe64f1SStephen Hemminger if (ret == 0) { 1133ffe64f1SStephen Hemminger netif_device_attach(rdev->ndev); 1143ffe64f1SStephen Hemminger } else { 1153ffe64f1SStephen Hemminger /* fallback to only primary channel */ 1163ffe64f1SStephen Hemminger for (i = 1; i < nvdev->num_chn; i++) 1173ffe64f1SStephen Hemminger netif_napi_del(&nvdev->chan_table[i].napi); 1183ffe64f1SStephen Hemminger 1193ffe64f1SStephen Hemminger nvdev->max_chn = 1; 1203ffe64f1SStephen Hemminger nvdev->num_chn = 1; 1213ffe64f1SStephen Hemminger } 1223ffe64f1SStephen Hemminger } 1233ffe64f1SStephen Hemminger 1243ffe64f1SStephen Hemminger rtnl_unlock(); 1253ffe64f1SStephen Hemminger } 1263ffe64f1SStephen Hemminger 12788098834SVitaly Kuznetsov static struct netvsc_device *alloc_net_device(void) 12895fa0405SHaiyang Zhang { 12995fa0405SHaiyang Zhang struct netvsc_device *net_device; 13095fa0405SHaiyang Zhang 13195fa0405SHaiyang Zhang net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL); 13295fa0405SHaiyang Zhang if (!net_device) 13395fa0405SHaiyang Zhang return NULL; 13495fa0405SHaiyang Zhang 135dc5cd894SHaiyang Zhang init_waitqueue_head(&net_device->wait_drain); 13695fa0405SHaiyang Zhang net_device->destroy = false; 137f6f13c12SHaiyang Zhang net_device->tx_disable = true; 1380da6edbdSStephen Hemminger 1397c3877f2SHaiyang Zhang net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT; 1407c3877f2SHaiyang Zhang net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT; 1418b532797Sstephen hemminger 142fd612602SStephen Hemminger init_completion(&net_device->channel_init_wait); 143732e4985Sstephen hemminger init_waitqueue_head(&net_device->subchan_open); 1443ffe64f1SStephen Hemminger INIT_WORK(&net_device->subchan_work, netvsc_subchan_work); 1457c3877f2SHaiyang Zhang 14695fa0405SHaiyang Zhang return net_device; 14795fa0405SHaiyang Zhang } 14895fa0405SHaiyang Zhang 149545a8e79Sstephen hemminger static void free_netvsc_device(struct rcu_head *head) 150f90251c8SHaiyang Zhang { 151545a8e79Sstephen hemminger struct netvsc_device *nvdev 152545a8e79Sstephen hemminger = container_of(head, struct netvsc_device, rcu); 153c0b558e5SHaiyang Zhang int i; 154c0b558e5SHaiyang Zhang 15502400fceSStephen Hemminger kfree(nvdev->extension); 15602400fceSStephen Hemminger vfree(nvdev->recv_buf); 15702400fceSStephen Hemminger vfree(nvdev->send_buf); 158*e9268a94SChristophe JAILLET bitmap_free(nvdev->send_section_map); 15902400fceSStephen Hemminger 160351e1581SHaiyang Zhang for (i = 0; i < VRSS_CHANNEL_MAX; i++) { 161351e1581SHaiyang Zhang xdp_rxq_info_unreg(&nvdev->chan_table[i].xdp_rxq); 1620ba35fe9SAndrea Parri (Microsoft) kfree(nvdev->chan_table[i].recv_buf); 1637426b1a5Sstephen hemminger vfree(nvdev->chan_table[i].mrc.slots); 164351e1581SHaiyang Zhang } 165c0b558e5SHaiyang Zhang 166f90251c8SHaiyang Zhang kfree(nvdev); 167f90251c8SHaiyang Zhang } 168f90251c8SHaiyang Zhang 169545a8e79Sstephen hemminger static void free_netvsc_device_rcu(struct netvsc_device *nvdev) 170545a8e79Sstephen hemminger { 171545a8e79Sstephen hemminger call_rcu(&nvdev->rcu, free_netvsc_device); 172545a8e79Sstephen hemminger } 17346b4f7f5Sstephen hemminger 1747992894cSMohammed Gamal static void netvsc_revoke_recv_buf(struct hv_device *device, 1753f076effSMohammed Gamal struct netvsc_device *net_device, 1763f076effSMohammed Gamal struct net_device *ndev) 17795fa0405SHaiyang Zhang { 1787992894cSMohammed Gamal struct nvsp_message *revoke_packet; 1797a2a0a84SStephen Hemminger int ret; 18095fa0405SHaiyang Zhang 18195fa0405SHaiyang Zhang /* 18295fa0405SHaiyang Zhang * If we got a section count, it means we received a 18395fa0405SHaiyang Zhang * SendReceiveBufferComplete msg (ie sent 18495fa0405SHaiyang Zhang * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need 18595fa0405SHaiyang Zhang * to send a revoke msg here 18695fa0405SHaiyang Zhang */ 18795fa0405SHaiyang Zhang if (net_device->recv_section_cnt) { 18895fa0405SHaiyang Zhang /* Send the revoke receive buffer */ 18995fa0405SHaiyang Zhang revoke_packet = &net_device->revoke_packet; 19095fa0405SHaiyang Zhang memset(revoke_packet, 0, sizeof(struct nvsp_message)); 19195fa0405SHaiyang Zhang 19295fa0405SHaiyang Zhang revoke_packet->hdr.msg_type = 19395fa0405SHaiyang Zhang NVSP_MSG1_TYPE_REVOKE_RECV_BUF; 19495fa0405SHaiyang Zhang revoke_packet->msg.v1_msg. 19595fa0405SHaiyang Zhang revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; 19695fa0405SHaiyang Zhang 197ec966381SStephen Hemminger trace_nvsp_send(ndev, revoke_packet); 198ec966381SStephen Hemminger 1993d541ac5SVitaly Kuznetsov ret = vmbus_sendpacket(device->channel, 20095fa0405SHaiyang Zhang revoke_packet, 20195fa0405SHaiyang Zhang sizeof(struct nvsp_message), 2024d18fcc9SAndres Beltran VMBUS_RQST_ID_NO_RESPONSE, 20395fa0405SHaiyang Zhang VM_PKT_DATA_INBAND, 0); 20473e64fa4SK. Y. Srinivasan /* If the failure is because the channel is rescinded; 20573e64fa4SK. Y. Srinivasan * ignore the failure since we cannot send on a rescinded 20673e64fa4SK. Y. Srinivasan * channel. This would allow us to properly cleanup 20773e64fa4SK. Y. Srinivasan * even when the channel is rescinded. 20873e64fa4SK. Y. Srinivasan */ 20973e64fa4SK. Y. Srinivasan if (device->channel->rescind) 21073e64fa4SK. Y. Srinivasan ret = 0; 21195fa0405SHaiyang Zhang /* 21295fa0405SHaiyang Zhang * If we failed here, we might as well return and 21395fa0405SHaiyang Zhang * have a leak rather than continue and a bugchk 21495fa0405SHaiyang Zhang */ 21595fa0405SHaiyang Zhang if (ret != 0) { 21695fa0405SHaiyang Zhang netdev_err(ndev, "unable to send " 21795fa0405SHaiyang Zhang "revoke receive buffer to netvsp\n"); 2187a2a0a84SStephen Hemminger return; 21995fa0405SHaiyang Zhang } 2208b532797Sstephen hemminger net_device->recv_section_cnt = 0; 22195fa0405SHaiyang Zhang } 2227992894cSMohammed Gamal } 2237992894cSMohammed Gamal 2247992894cSMohammed Gamal static void netvsc_revoke_send_buf(struct hv_device *device, 2253f076effSMohammed Gamal struct netvsc_device *net_device, 2263f076effSMohammed Gamal struct net_device *ndev) 2277992894cSMohammed Gamal { 2287992894cSMohammed Gamal struct nvsp_message *revoke_packet; 2297992894cSMohammed Gamal int ret; 23095fa0405SHaiyang Zhang 231c25aaf81SKY Srinivasan /* Deal with the send buffer we may have setup. 232c25aaf81SKY Srinivasan * If we got a send section size, it means we received a 233c51ed182SHaiyang Zhang * NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE msg (ie sent 234c51ed182SHaiyang Zhang * NVSP_MSG1_TYPE_SEND_SEND_BUF msg) therefore, we need 235c25aaf81SKY Srinivasan * to send a revoke msg here 236c25aaf81SKY Srinivasan */ 2378b532797Sstephen hemminger if (net_device->send_section_cnt) { 238c25aaf81SKY Srinivasan /* Send the revoke receive buffer */ 239c25aaf81SKY Srinivasan revoke_packet = &net_device->revoke_packet; 240c25aaf81SKY Srinivasan memset(revoke_packet, 0, sizeof(struct nvsp_message)); 241c25aaf81SKY Srinivasan 242c25aaf81SKY Srinivasan revoke_packet->hdr.msg_type = 243c25aaf81SKY Srinivasan NVSP_MSG1_TYPE_REVOKE_SEND_BUF; 244c51ed182SHaiyang Zhang revoke_packet->msg.v1_msg.revoke_send_buf.id = 245c51ed182SHaiyang Zhang NETVSC_SEND_BUFFER_ID; 246c25aaf81SKY Srinivasan 247ec966381SStephen Hemminger trace_nvsp_send(ndev, revoke_packet); 248ec966381SStephen Hemminger 2493d541ac5SVitaly Kuznetsov ret = vmbus_sendpacket(device->channel, 250c25aaf81SKY Srinivasan revoke_packet, 251c25aaf81SKY Srinivasan sizeof(struct nvsp_message), 2524d18fcc9SAndres Beltran VMBUS_RQST_ID_NO_RESPONSE, 253c25aaf81SKY Srinivasan VM_PKT_DATA_INBAND, 0); 25473e64fa4SK. Y. Srinivasan 25573e64fa4SK. Y. Srinivasan /* If the failure is because the channel is rescinded; 25673e64fa4SK. Y. Srinivasan * ignore the failure since we cannot send on a rescinded 25773e64fa4SK. Y. Srinivasan * channel. This would allow us to properly cleanup 25873e64fa4SK. Y. Srinivasan * even when the channel is rescinded. 25973e64fa4SK. Y. Srinivasan */ 26073e64fa4SK. Y. Srinivasan if (device->channel->rescind) 26173e64fa4SK. Y. Srinivasan ret = 0; 26273e64fa4SK. Y. Srinivasan 263c25aaf81SKY Srinivasan /* If we failed here, we might as well return and 264c25aaf81SKY Srinivasan * have a leak rather than continue and a bugchk 265c25aaf81SKY Srinivasan */ 266c25aaf81SKY Srinivasan if (ret != 0) { 267c25aaf81SKY Srinivasan netdev_err(ndev, "unable to send " 268c25aaf81SKY Srinivasan "revoke send buffer to netvsp\n"); 2697a2a0a84SStephen Hemminger return; 270c25aaf81SKY Srinivasan } 2718b532797Sstephen hemminger net_device->send_section_cnt = 0; 272c25aaf81SKY Srinivasan } 2730cf73780SVitaly Kuznetsov } 2740cf73780SVitaly Kuznetsov 2757992894cSMohammed Gamal static void netvsc_teardown_recv_gpadl(struct hv_device *device, 2763f076effSMohammed Gamal struct netvsc_device *net_device, 2773f076effSMohammed Gamal struct net_device *ndev) 2780cf73780SVitaly Kuznetsov { 2790cf73780SVitaly Kuznetsov int ret; 2800cf73780SVitaly Kuznetsov 281d4dccf35STianyu Lan if (net_device->recv_buf_gpadl_handle.gpadl_handle) { 2820cf73780SVitaly Kuznetsov ret = vmbus_teardown_gpadl(device->channel, 283d4dccf35STianyu Lan &net_device->recv_buf_gpadl_handle); 2840cf73780SVitaly Kuznetsov 2850cf73780SVitaly Kuznetsov /* If we failed here, we might as well return and have a leak 2860cf73780SVitaly Kuznetsov * rather than continue and a bugchk 2870cf73780SVitaly Kuznetsov */ 2880cf73780SVitaly Kuznetsov if (ret != 0) { 2890cf73780SVitaly Kuznetsov netdev_err(ndev, 2900cf73780SVitaly Kuznetsov "unable to teardown receive buffer's gpadl\n"); 2910cf73780SVitaly Kuznetsov return; 2920cf73780SVitaly Kuznetsov } 2930cf73780SVitaly Kuznetsov } 2947992894cSMohammed Gamal } 2957992894cSMohammed Gamal 2967992894cSMohammed Gamal static void netvsc_teardown_send_gpadl(struct hv_device *device, 2973f076effSMohammed Gamal struct netvsc_device *net_device, 2983f076effSMohammed Gamal struct net_device *ndev) 2997992894cSMohammed Gamal { 3007992894cSMohammed Gamal int ret; 3010cf73780SVitaly Kuznetsov 302d4dccf35STianyu Lan if (net_device->send_buf_gpadl_handle.gpadl_handle) { 3033d541ac5SVitaly Kuznetsov ret = vmbus_teardown_gpadl(device->channel, 304d4dccf35STianyu Lan &net_device->send_buf_gpadl_handle); 305c25aaf81SKY Srinivasan 306c25aaf81SKY Srinivasan /* If we failed here, we might as well return and have a leak 307c25aaf81SKY Srinivasan * rather than continue and a bugchk 308c25aaf81SKY Srinivasan */ 309c25aaf81SKY Srinivasan if (ret != 0) { 310c25aaf81SKY Srinivasan netdev_err(ndev, 311c25aaf81SKY Srinivasan "unable to teardown send buffer's gpadl\n"); 3127a2a0a84SStephen Hemminger return; 313c25aaf81SKY Srinivasan } 314c25aaf81SKY Srinivasan } 31595fa0405SHaiyang Zhang } 31695fa0405SHaiyang Zhang 3177426b1a5Sstephen hemminger int netvsc_alloc_recv_comp_ring(struct netvsc_device *net_device, u32 q_idx) 3187426b1a5Sstephen hemminger { 3197426b1a5Sstephen hemminger struct netvsc_channel *nvchan = &net_device->chan_table[q_idx]; 3207426b1a5Sstephen hemminger int node = cpu_to_node(nvchan->channel->target_cpu); 3217426b1a5Sstephen hemminger size_t size; 3227426b1a5Sstephen hemminger 3237426b1a5Sstephen hemminger size = net_device->recv_completion_cnt * sizeof(struct recv_comp_data); 3247426b1a5Sstephen hemminger nvchan->mrc.slots = vzalloc_node(size, node); 3257426b1a5Sstephen hemminger if (!nvchan->mrc.slots) 3267426b1a5Sstephen hemminger nvchan->mrc.slots = vzalloc(size); 3277426b1a5Sstephen hemminger 3287426b1a5Sstephen hemminger return nvchan->mrc.slots ? 0 : -ENOMEM; 3297426b1a5Sstephen hemminger } 3307426b1a5Sstephen hemminger 33195790837Sstephen hemminger static int netvsc_init_buf(struct hv_device *device, 3328b532797Sstephen hemminger struct netvsc_device *net_device, 3338b532797Sstephen hemminger const struct netvsc_device_info *device_info) 33495fa0405SHaiyang Zhang { 3357426b1a5Sstephen hemminger struct nvsp_1_message_send_receive_buffer_complete *resp; 33695833370Sstephen hemminger struct net_device *ndev = hv_get_drvdata(device); 33795833370Sstephen hemminger struct nvsp_message *init_packet; 3388b532797Sstephen hemminger unsigned int buf_size; 3390102eeedSAndrea Parri (Microsoft) int i, ret = 0; 34095fa0405SHaiyang Zhang 3418b532797Sstephen hemminger /* Get receive buffer area. */ 3420ab09befSAlex Ng buf_size = device_info->recv_sections * device_info->recv_section_size; 3438b532797Sstephen hemminger buf_size = roundup(buf_size, PAGE_SIZE); 3448b532797Sstephen hemminger 34511b2b653SHaiyang Zhang /* Legacy hosts only allow smaller receive buffer */ 34611b2b653SHaiyang Zhang if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2) 34711b2b653SHaiyang Zhang buf_size = min_t(unsigned int, buf_size, 34811b2b653SHaiyang Zhang NETVSC_RECEIVE_BUFFER_SIZE_LEGACY); 34911b2b653SHaiyang Zhang 3508b532797Sstephen hemminger net_device->recv_buf = vzalloc(buf_size); 35195fa0405SHaiyang Zhang if (!net_device->recv_buf) { 3528b532797Sstephen hemminger netdev_err(ndev, 3538b532797Sstephen hemminger "unable to allocate receive buffer of size %u\n", 3548b532797Sstephen hemminger buf_size); 35595fa0405SHaiyang Zhang ret = -ENOMEM; 35695fa0405SHaiyang Zhang goto cleanup; 35795fa0405SHaiyang Zhang } 35895fa0405SHaiyang Zhang 359c5d24bddSHaiyang Zhang net_device->recv_buf_size = buf_size; 360c5d24bddSHaiyang Zhang 36195fa0405SHaiyang Zhang /* 36295fa0405SHaiyang Zhang * Establish the gpadl handle for this buffer on this 36395fa0405SHaiyang Zhang * channel. Note: This call uses the vmbus connection rather 36495fa0405SHaiyang Zhang * than the channel to establish the gpadl handle. 36595fa0405SHaiyang Zhang */ 36695fa0405SHaiyang Zhang ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf, 3678b532797Sstephen hemminger buf_size, 36895fa0405SHaiyang Zhang &net_device->recv_buf_gpadl_handle); 36995fa0405SHaiyang Zhang if (ret != 0) { 37095fa0405SHaiyang Zhang netdev_err(ndev, 37195fa0405SHaiyang Zhang "unable to establish receive buffer's gpadl\n"); 37295fa0405SHaiyang Zhang goto cleanup; 37395fa0405SHaiyang Zhang } 37495fa0405SHaiyang Zhang 37595fa0405SHaiyang Zhang /* Notify the NetVsp of the gpadl handle */ 37695fa0405SHaiyang Zhang init_packet = &net_device->channel_init_pkt; 37795fa0405SHaiyang Zhang memset(init_packet, 0, sizeof(struct nvsp_message)); 37895fa0405SHaiyang Zhang init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF; 37995fa0405SHaiyang Zhang init_packet->msg.v1_msg.send_recv_buf. 380d4dccf35STianyu Lan gpadl_handle = net_device->recv_buf_gpadl_handle.gpadl_handle; 38195fa0405SHaiyang Zhang init_packet->msg.v1_msg. 38295fa0405SHaiyang Zhang send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; 38395fa0405SHaiyang Zhang 384ec966381SStephen Hemminger trace_nvsp_send(ndev, init_packet); 385ec966381SStephen Hemminger 38695fa0405SHaiyang Zhang /* Send the gpadl notification request */ 38795fa0405SHaiyang Zhang ret = vmbus_sendpacket(device->channel, init_packet, 38895fa0405SHaiyang Zhang sizeof(struct nvsp_message), 38995fa0405SHaiyang Zhang (unsigned long)init_packet, 39095fa0405SHaiyang Zhang VM_PKT_DATA_INBAND, 39195fa0405SHaiyang Zhang VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 39295fa0405SHaiyang Zhang if (ret != 0) { 39395fa0405SHaiyang Zhang netdev_err(ndev, 39495fa0405SHaiyang Zhang "unable to send receive buffer's gpadl to netvsp\n"); 39595fa0405SHaiyang Zhang goto cleanup; 39695fa0405SHaiyang Zhang } 39795fa0405SHaiyang Zhang 3985362855aSVitaly Kuznetsov wait_for_completion(&net_device->channel_init_wait); 39995fa0405SHaiyang Zhang 40095fa0405SHaiyang Zhang /* Check the response */ 4017426b1a5Sstephen hemminger resp = &init_packet->msg.v1_msg.send_recv_buf_complete; 4027426b1a5Sstephen hemminger if (resp->status != NVSP_STAT_SUCCESS) { 4037426b1a5Sstephen hemminger netdev_err(ndev, 4047426b1a5Sstephen hemminger "Unable to complete receive buffer initialization with NetVsp - status %d\n", 4057426b1a5Sstephen hemminger resp->status); 40695fa0405SHaiyang Zhang ret = -EINVAL; 40795fa0405SHaiyang Zhang goto cleanup; 40895fa0405SHaiyang Zhang } 40995fa0405SHaiyang Zhang 41095fa0405SHaiyang Zhang /* Parse the response */ 4117426b1a5Sstephen hemminger netdev_dbg(ndev, "Receive sections: %u sub_allocs: size %u count: %u\n", 4127426b1a5Sstephen hemminger resp->num_sections, resp->sections[0].sub_alloc_size, 4137426b1a5Sstephen hemminger resp->sections[0].num_sub_allocs); 41495fa0405SHaiyang Zhang 4158b532797Sstephen hemminger /* There should only be one section for the entire receive buffer */ 4168b532797Sstephen hemminger if (resp->num_sections != 1 || resp->sections[0].offset != 0) { 41795fa0405SHaiyang Zhang ret = -EINVAL; 41895fa0405SHaiyang Zhang goto cleanup; 41995fa0405SHaiyang Zhang } 42095fa0405SHaiyang Zhang 4218b532797Sstephen hemminger net_device->recv_section_size = resp->sections[0].sub_alloc_size; 4228b532797Sstephen hemminger net_device->recv_section_cnt = resp->sections[0].num_sub_allocs; 4238b532797Sstephen hemminger 42444144185SAndres Beltran /* Ensure buffer will not overflow */ 42544144185SAndres Beltran if (net_device->recv_section_size < NETVSC_MTU_MIN || (u64)net_device->recv_section_size * 42644144185SAndres Beltran (u64)net_device->recv_section_cnt > (u64)buf_size) { 42744144185SAndres Beltran netdev_err(ndev, "invalid recv_section_size %u\n", 42844144185SAndres Beltran net_device->recv_section_size); 42944144185SAndres Beltran ret = -EINVAL; 43044144185SAndres Beltran goto cleanup; 43144144185SAndres Beltran } 43244144185SAndres Beltran 4330102eeedSAndrea Parri (Microsoft) for (i = 0; i < VRSS_CHANNEL_MAX; i++) { 4340102eeedSAndrea Parri (Microsoft) struct netvsc_channel *nvchan = &net_device->chan_table[i]; 4350102eeedSAndrea Parri (Microsoft) 4360102eeedSAndrea Parri (Microsoft) nvchan->recv_buf = kzalloc(net_device->recv_section_size, GFP_KERNEL); 4370102eeedSAndrea Parri (Microsoft) if (nvchan->recv_buf == NULL) { 4380102eeedSAndrea Parri (Microsoft) ret = -ENOMEM; 4390102eeedSAndrea Parri (Microsoft) goto cleanup; 4400102eeedSAndrea Parri (Microsoft) } 4410102eeedSAndrea Parri (Microsoft) } 4420102eeedSAndrea Parri (Microsoft) 443f87238d3SHaiyang Zhang /* Setup receive completion ring. 444f87238d3SHaiyang Zhang * Add 1 to the recv_section_cnt because at least one entry in a 445f87238d3SHaiyang Zhang * ring buffer has to be empty. 446f87238d3SHaiyang Zhang */ 447f87238d3SHaiyang Zhang net_device->recv_completion_cnt = net_device->recv_section_cnt + 1; 4487426b1a5Sstephen hemminger ret = netvsc_alloc_recv_comp_ring(net_device, 0); 4497426b1a5Sstephen hemminger if (ret) 4507426b1a5Sstephen hemminger goto cleanup; 4517426b1a5Sstephen hemminger 4527426b1a5Sstephen hemminger /* Now setup the send buffer. */ 4530ab09befSAlex Ng buf_size = device_info->send_sections * device_info->send_section_size; 4548b532797Sstephen hemminger buf_size = round_up(buf_size, PAGE_SIZE); 4558b532797Sstephen hemminger 4568b532797Sstephen hemminger net_device->send_buf = vzalloc(buf_size); 457c25aaf81SKY Srinivasan if (!net_device->send_buf) { 4588b532797Sstephen hemminger netdev_err(ndev, "unable to allocate send buffer of size %u\n", 4598b532797Sstephen hemminger buf_size); 460c25aaf81SKY Srinivasan ret = -ENOMEM; 461c25aaf81SKY Srinivasan goto cleanup; 462c25aaf81SKY Srinivasan } 463d4dccf35STianyu Lan net_device->send_buf_size = buf_size; 464c25aaf81SKY Srinivasan 465c25aaf81SKY Srinivasan /* Establish the gpadl handle for this buffer on this 466c25aaf81SKY Srinivasan * channel. Note: This call uses the vmbus connection rather 467c25aaf81SKY Srinivasan * than the channel to establish the gpadl handle. 468c25aaf81SKY Srinivasan */ 469c25aaf81SKY Srinivasan ret = vmbus_establish_gpadl(device->channel, net_device->send_buf, 4708b532797Sstephen hemminger buf_size, 471c25aaf81SKY Srinivasan &net_device->send_buf_gpadl_handle); 472c25aaf81SKY Srinivasan if (ret != 0) { 473c25aaf81SKY Srinivasan netdev_err(ndev, 474c25aaf81SKY Srinivasan "unable to establish send buffer's gpadl\n"); 475c25aaf81SKY Srinivasan goto cleanup; 476c25aaf81SKY Srinivasan } 477c25aaf81SKY Srinivasan 478c25aaf81SKY Srinivasan /* Notify the NetVsp of the gpadl handle */ 479c25aaf81SKY Srinivasan init_packet = &net_device->channel_init_pkt; 480c25aaf81SKY Srinivasan memset(init_packet, 0, sizeof(struct nvsp_message)); 481c25aaf81SKY Srinivasan init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF; 482c51ed182SHaiyang Zhang init_packet->msg.v1_msg.send_send_buf.gpadl_handle = 483d4dccf35STianyu Lan net_device->send_buf_gpadl_handle.gpadl_handle; 484c51ed182SHaiyang Zhang init_packet->msg.v1_msg.send_send_buf.id = NETVSC_SEND_BUFFER_ID; 485c25aaf81SKY Srinivasan 486ec966381SStephen Hemminger trace_nvsp_send(ndev, init_packet); 487ec966381SStephen Hemminger 488c25aaf81SKY Srinivasan /* Send the gpadl notification request */ 489c25aaf81SKY Srinivasan ret = vmbus_sendpacket(device->channel, init_packet, 490c25aaf81SKY Srinivasan sizeof(struct nvsp_message), 491c25aaf81SKY Srinivasan (unsigned long)init_packet, 492c25aaf81SKY Srinivasan VM_PKT_DATA_INBAND, 493c25aaf81SKY Srinivasan VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 494c25aaf81SKY Srinivasan if (ret != 0) { 495c25aaf81SKY Srinivasan netdev_err(ndev, 496c25aaf81SKY Srinivasan "unable to send send buffer's gpadl to netvsp\n"); 497c25aaf81SKY Srinivasan goto cleanup; 498c25aaf81SKY Srinivasan } 499c25aaf81SKY Srinivasan 5005362855aSVitaly Kuznetsov wait_for_completion(&net_device->channel_init_wait); 501c25aaf81SKY Srinivasan 502c25aaf81SKY Srinivasan /* Check the response */ 503c25aaf81SKY Srinivasan if (init_packet->msg.v1_msg. 504c25aaf81SKY Srinivasan send_send_buf_complete.status != NVSP_STAT_SUCCESS) { 505c25aaf81SKY Srinivasan netdev_err(ndev, "Unable to complete send buffer " 506c25aaf81SKY Srinivasan "initialization with NetVsp - status %d\n", 507c25aaf81SKY Srinivasan init_packet->msg.v1_msg. 508c51ed182SHaiyang Zhang send_send_buf_complete.status); 509c25aaf81SKY Srinivasan ret = -EINVAL; 510c25aaf81SKY Srinivasan goto cleanup; 511c25aaf81SKY Srinivasan } 512c25aaf81SKY Srinivasan 513c25aaf81SKY Srinivasan /* Parse the response */ 514c25aaf81SKY Srinivasan net_device->send_section_size = init_packet->msg. 515c25aaf81SKY Srinivasan v1_msg.send_send_buf_complete.section_size; 51644144185SAndres Beltran if (net_device->send_section_size < NETVSC_MTU_MIN) { 51744144185SAndres Beltran netdev_err(ndev, "invalid send_section_size %u\n", 51844144185SAndres Beltran net_device->send_section_size); 51944144185SAndres Beltran ret = -EINVAL; 52044144185SAndres Beltran goto cleanup; 52144144185SAndres Beltran } 522c25aaf81SKY Srinivasan 5238b532797Sstephen hemminger /* Section count is simply the size divided by the section size. */ 5248b532797Sstephen hemminger net_device->send_section_cnt = buf_size / net_device->send_section_size; 525c25aaf81SKY Srinivasan 52693ba2222SVitaly Kuznetsov netdev_dbg(ndev, "Send section size: %d, Section count:%d\n", 527c25aaf81SKY Srinivasan net_device->send_section_size, net_device->send_section_cnt); 528c25aaf81SKY Srinivasan 529c25aaf81SKY Srinivasan /* Setup state for managing the send buffer. */ 530*e9268a94SChristophe JAILLET net_device->send_section_map = bitmap_zalloc(net_device->send_section_cnt, 531*e9268a94SChristophe JAILLET GFP_KERNEL); 532*e9268a94SChristophe JAILLET if (!net_device->send_section_map) { 533dd1d3f8fSWei Yongjun ret = -ENOMEM; 534c25aaf81SKY Srinivasan goto cleanup; 535dd1d3f8fSWei Yongjun } 536c25aaf81SKY Srinivasan 53795fa0405SHaiyang Zhang goto exit; 53895fa0405SHaiyang Zhang 53995fa0405SHaiyang Zhang cleanup: 5403f076effSMohammed Gamal netvsc_revoke_recv_buf(device, net_device, ndev); 5413f076effSMohammed Gamal netvsc_revoke_send_buf(device, net_device, ndev); 5423f076effSMohammed Gamal netvsc_teardown_recv_gpadl(device, net_device, ndev); 5433f076effSMohammed Gamal netvsc_teardown_send_gpadl(device, net_device, ndev); 54495fa0405SHaiyang Zhang 54595fa0405SHaiyang Zhang exit: 54695fa0405SHaiyang Zhang return ret; 54795fa0405SHaiyang Zhang } 54895fa0405SHaiyang Zhang 549f157e78dSHaiyang Zhang /* Negotiate NVSP protocol version */ 550f157e78dSHaiyang Zhang static int negotiate_nvsp_ver(struct hv_device *device, 551f157e78dSHaiyang Zhang struct netvsc_device *net_device, 552f157e78dSHaiyang Zhang struct nvsp_message *init_packet, 553f157e78dSHaiyang Zhang u32 nvsp_ver) 55495fa0405SHaiyang Zhang { 5550a1275caSVitaly Kuznetsov struct net_device *ndev = hv_get_drvdata(device); 5567390fe9cSNicholas Mc Guire int ret; 557f157e78dSHaiyang Zhang 558f157e78dSHaiyang Zhang memset(init_packet, 0, sizeof(struct nvsp_message)); 559f157e78dSHaiyang Zhang init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT; 560f157e78dSHaiyang Zhang init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver; 561f157e78dSHaiyang Zhang init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver; 562ec966381SStephen Hemminger trace_nvsp_send(ndev, init_packet); 563ec966381SStephen Hemminger 564f157e78dSHaiyang Zhang /* Send the init request */ 565f157e78dSHaiyang Zhang ret = vmbus_sendpacket(device->channel, init_packet, 566f157e78dSHaiyang Zhang sizeof(struct nvsp_message), 567f157e78dSHaiyang Zhang (unsigned long)init_packet, 568f157e78dSHaiyang Zhang VM_PKT_DATA_INBAND, 569f157e78dSHaiyang Zhang VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 570f157e78dSHaiyang Zhang 571f157e78dSHaiyang Zhang if (ret != 0) 572f157e78dSHaiyang Zhang return ret; 573f157e78dSHaiyang Zhang 5745362855aSVitaly Kuznetsov wait_for_completion(&net_device->channel_init_wait); 575f157e78dSHaiyang Zhang 576f157e78dSHaiyang Zhang if (init_packet->msg.init_msg.init_complete.status != 577f157e78dSHaiyang Zhang NVSP_STAT_SUCCESS) 578f157e78dSHaiyang Zhang return -EINVAL; 579f157e78dSHaiyang Zhang 580a1eabb01SHaiyang Zhang if (nvsp_ver == NVSP_PROTOCOL_VERSION_1) 581f157e78dSHaiyang Zhang return 0; 582f157e78dSHaiyang Zhang 58371790a27SHaiyang Zhang /* NVSPv2 or later: Send NDIS config */ 584f157e78dSHaiyang Zhang memset(init_packet, 0, sizeof(struct nvsp_message)); 585f157e78dSHaiyang Zhang init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG; 5860a1275caSVitaly Kuznetsov init_packet->msg.v2_msg.send_ndis_config.mtu = ndev->mtu + ETH_HLEN; 5871f5f3a75SHaiyang Zhang init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1; 588f157e78dSHaiyang Zhang 5897f5d5af0SHaiyang Zhang if (nvsp_ver >= NVSP_PROTOCOL_VERSION_5) { 59096854bbdSAndrea Parri (Microsoft) if (hv_is_isolation_supported()) 59196854bbdSAndrea Parri (Microsoft) netdev_info(ndev, "SR-IOV not advertised by guests on the host supporting isolation\n"); 59296854bbdSAndrea Parri (Microsoft) else 59371790a27SHaiyang Zhang init_packet->msg.v2_msg.send_ndis_config.capability.sriov = 1; 59471790a27SHaiyang Zhang 5957f5d5af0SHaiyang Zhang /* Teaming bit is needed to receive link speed updates */ 5967f5d5af0SHaiyang Zhang init_packet->msg.v2_msg.send_ndis_config.capability.teaming = 1; 5977f5d5af0SHaiyang Zhang } 5987f5d5af0SHaiyang Zhang 599c8e4eff4SHaiyang Zhang if (nvsp_ver >= NVSP_PROTOCOL_VERSION_61) 600c8e4eff4SHaiyang Zhang init_packet->msg.v2_msg.send_ndis_config.capability.rsc = 1; 601c8e4eff4SHaiyang Zhang 602ec966381SStephen Hemminger trace_nvsp_send(ndev, init_packet); 603ec966381SStephen Hemminger 604f157e78dSHaiyang Zhang ret = vmbus_sendpacket(device->channel, init_packet, 605f157e78dSHaiyang Zhang sizeof(struct nvsp_message), 6064d18fcc9SAndres Beltran VMBUS_RQST_ID_NO_RESPONSE, 607f157e78dSHaiyang Zhang VM_PKT_DATA_INBAND, 0); 608f157e78dSHaiyang Zhang 609f157e78dSHaiyang Zhang return ret; 610f157e78dSHaiyang Zhang } 611f157e78dSHaiyang Zhang 61295790837Sstephen hemminger static int netvsc_connect_vsp(struct hv_device *device, 6138b532797Sstephen hemminger struct netvsc_device *net_device, 6148b532797Sstephen hemminger const struct netvsc_device_info *device_info) 615f157e78dSHaiyang Zhang { 616ec966381SStephen Hemminger struct net_device *ndev = hv_get_drvdata(device); 6171b17ca04SColin Ian King static const u32 ver_list[] = { 618e5a78fadSStephen Hemminger NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2, 6190dcec221SHaiyang Zhang NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5, 6200dcec221SHaiyang Zhang NVSP_PROTOCOL_VERSION_6, NVSP_PROTOCOL_VERSION_61 62195790837Sstephen hemminger }; 62295790837Sstephen hemminger struct nvsp_message *init_packet; 62395790837Sstephen hemminger int ndis_version, i, ret; 62495fa0405SHaiyang Zhang 62595fa0405SHaiyang Zhang init_packet = &net_device->channel_init_pkt; 62695fa0405SHaiyang Zhang 627f157e78dSHaiyang Zhang /* Negotiate the latest NVSP protocol supported */ 628e5a78fadSStephen Hemminger for (i = ARRAY_SIZE(ver_list) - 1; i >= 0; i--) 629f157e78dSHaiyang Zhang if (negotiate_nvsp_ver(device, net_device, init_packet, 630a1eabb01SHaiyang Zhang ver_list[i]) == 0) { 631a1eabb01SHaiyang Zhang net_device->nvsp_version = ver_list[i]; 632a1eabb01SHaiyang Zhang break; 633a1eabb01SHaiyang Zhang } 634a1eabb01SHaiyang Zhang 635a1eabb01SHaiyang Zhang if (i < 0) { 63695fa0405SHaiyang Zhang ret = -EPROTO; 63795fa0405SHaiyang Zhang goto cleanup; 63895fa0405SHaiyang Zhang } 639f157e78dSHaiyang Zhang 64096854bbdSAndrea Parri (Microsoft) if (hv_is_isolation_supported() && net_device->nvsp_version < NVSP_PROTOCOL_VERSION_61) { 64196854bbdSAndrea Parri (Microsoft) netdev_err(ndev, "Invalid NVSP version 0x%x (expected >= 0x%x) from the host supporting isolation\n", 64296854bbdSAndrea Parri (Microsoft) net_device->nvsp_version, NVSP_PROTOCOL_VERSION_61); 64396854bbdSAndrea Parri (Microsoft) ret = -EPROTO; 64496854bbdSAndrea Parri (Microsoft) goto cleanup; 64596854bbdSAndrea Parri (Microsoft) } 64696854bbdSAndrea Parri (Microsoft) 647f157e78dSHaiyang Zhang pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version); 648f157e78dSHaiyang Zhang 64995fa0405SHaiyang Zhang /* Send the ndis version */ 65095fa0405SHaiyang Zhang memset(init_packet, 0, sizeof(struct nvsp_message)); 65195fa0405SHaiyang Zhang 652a1eabb01SHaiyang Zhang if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4) 6531f73db49SKY Srinivasan ndis_version = 0x00060001; 654a1eabb01SHaiyang Zhang else 655a1eabb01SHaiyang Zhang ndis_version = 0x0006001e; 65695fa0405SHaiyang Zhang 65795fa0405SHaiyang Zhang init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER; 65895fa0405SHaiyang Zhang init_packet->msg.v1_msg. 65995fa0405SHaiyang Zhang send_ndis_ver.ndis_major_ver = 66095fa0405SHaiyang Zhang (ndis_version & 0xFFFF0000) >> 16; 66195fa0405SHaiyang Zhang init_packet->msg.v1_msg. 66295fa0405SHaiyang Zhang send_ndis_ver.ndis_minor_ver = 66395fa0405SHaiyang Zhang ndis_version & 0xFFFF; 66495fa0405SHaiyang Zhang 665ec966381SStephen Hemminger trace_nvsp_send(ndev, init_packet); 666ec966381SStephen Hemminger 66795fa0405SHaiyang Zhang /* Send the init request */ 66895fa0405SHaiyang Zhang ret = vmbus_sendpacket(device->channel, init_packet, 66995fa0405SHaiyang Zhang sizeof(struct nvsp_message), 6704d18fcc9SAndres Beltran VMBUS_RQST_ID_NO_RESPONSE, 67195fa0405SHaiyang Zhang VM_PKT_DATA_INBAND, 0); 67295fa0405SHaiyang Zhang if (ret != 0) 67395fa0405SHaiyang Zhang goto cleanup; 67495fa0405SHaiyang Zhang 67599d3016dSHaiyang Zhang 6768b532797Sstephen hemminger ret = netvsc_init_buf(device, net_device, device_info); 67795fa0405SHaiyang Zhang 67895fa0405SHaiyang Zhang cleanup: 67995fa0405SHaiyang Zhang return ret; 68095fa0405SHaiyang Zhang } 68195fa0405SHaiyang Zhang 68295fa0405SHaiyang Zhang /* 68395fa0405SHaiyang Zhang * netvsc_device_remove - Callback when the root bus device is removed 68495fa0405SHaiyang Zhang */ 685e08f3ea5SStephen Hemminger void netvsc_device_remove(struct hv_device *device) 68695fa0405SHaiyang Zhang { 6873d541ac5SVitaly Kuznetsov struct net_device *ndev = hv_get_drvdata(device); 6883d541ac5SVitaly Kuznetsov struct net_device_context *net_device_ctx = netdev_priv(ndev); 68979e8cbe7Sstephen hemminger struct netvsc_device *net_device 69079e8cbe7Sstephen hemminger = rtnl_dereference(net_device_ctx->nvdev); 69115a863bfSstephen hemminger int i; 69295fa0405SHaiyang Zhang 693a56d99d7SMohammed Gamal /* 694a56d99d7SMohammed Gamal * Revoke receive buffer. If host is pre-Win2016 then tear down 695a56d99d7SMohammed Gamal * receive buffer GPADL. Do the same for send buffer. 696a56d99d7SMohammed Gamal */ 6973f076effSMohammed Gamal netvsc_revoke_recv_buf(device, net_device, ndev); 698a56d99d7SMohammed Gamal if (vmbus_proto_version < VERSION_WIN10) 6993f076effSMohammed Gamal netvsc_teardown_recv_gpadl(device, net_device, ndev); 700a56d99d7SMohammed Gamal 7013f076effSMohammed Gamal netvsc_revoke_send_buf(device, net_device, ndev); 702a56d99d7SMohammed Gamal if (vmbus_proto_version < VERSION_WIN10) 7033f076effSMohammed Gamal netvsc_teardown_send_gpadl(device, net_device, ndev); 70495fa0405SHaiyang Zhang 705545a8e79Sstephen hemminger RCU_INIT_POINTER(net_device_ctx->nvdev, NULL); 70695fa0405SHaiyang Zhang 707ac504767SAndrea Parri (Microsoft) /* Disable NAPI and disassociate its context from the device. */ 708ac504767SAndrea Parri (Microsoft) for (i = 0; i < net_device->num_chn; i++) { 709ac504767SAndrea Parri (Microsoft) /* See also vmbus_reset_channel_cb(). */ 710ac504767SAndrea Parri (Microsoft) napi_disable(&net_device->chan_table[i].napi); 7118348e046SStephen Hemminger netif_napi_del(&net_device->chan_table[i].napi); 712ac504767SAndrea Parri (Microsoft) } 7138348e046SStephen Hemminger 71495fa0405SHaiyang Zhang /* 71595fa0405SHaiyang Zhang * At this point, no one should be accessing net_device 71695fa0405SHaiyang Zhang * except in here 71795fa0405SHaiyang Zhang */ 71893ba2222SVitaly Kuznetsov netdev_dbg(ndev, "net device safe to remove\n"); 71995fa0405SHaiyang Zhang 72095fa0405SHaiyang Zhang /* Now, we can close the channel safely */ 72195fa0405SHaiyang Zhang vmbus_close(device->channel); 72295fa0405SHaiyang Zhang 723a56d99d7SMohammed Gamal /* 724a56d99d7SMohammed Gamal * If host is Win2016 or higher then we do the GPADL tear down 725a56d99d7SMohammed Gamal * here after VMBus is closed. 726a56d99d7SMohammed Gamal */ 7277992894cSMohammed Gamal if (vmbus_proto_version >= VERSION_WIN10) { 7283f076effSMohammed Gamal netvsc_teardown_recv_gpadl(device, net_device, ndev); 7293f076effSMohammed Gamal netvsc_teardown_send_gpadl(device, net_device, ndev); 7307992894cSMohammed Gamal } 7310cf73780SVitaly Kuznetsov 73295fa0405SHaiyang Zhang /* Release all resources */ 733545a8e79Sstephen hemminger free_netvsc_device_rcu(net_device); 73495fa0405SHaiyang Zhang } 73595fa0405SHaiyang Zhang 73633be96e4SHaiyang Zhang #define RING_AVAIL_PERCENT_HIWATER 20 73733be96e4SHaiyang Zhang #define RING_AVAIL_PERCENT_LOWATER 10 73833be96e4SHaiyang Zhang 739c25aaf81SKY Srinivasan static inline void netvsc_free_send_slot(struct netvsc_device *net_device, 740c25aaf81SKY Srinivasan u32 index) 741c25aaf81SKY Srinivasan { 742c25aaf81SKY Srinivasan sync_change_bit(index, net_device->send_section_map); 743c25aaf81SKY Srinivasan } 744c25aaf81SKY Srinivasan 745c347b927SStephen Hemminger static void netvsc_send_tx_complete(struct net_device *ndev, 746c347b927SStephen Hemminger struct netvsc_device *net_device, 747c347b927SStephen Hemminger struct vmbus_channel *channel, 748f9645430Sstephen hemminger const struct vmpacket_descriptor *desc, 749f9645430Sstephen hemminger int budget) 75095fa0405SHaiyang Zhang { 75109af87d1SSimon Xiao struct net_device_context *ndev_ctx = netdev_priv(ndev); 7524d18fcc9SAndres Beltran struct sk_buff *skb; 7535b54dac8SHaiyang Zhang u16 q_idx = 0; 7545b54dac8SHaiyang Zhang int queue_sends; 7554d18fcc9SAndres Beltran u64 cmd_rqst; 7564d18fcc9SAndres Beltran 757bf5fd8caSAndrea Parri (Microsoft) cmd_rqst = channel->request_addr_callback(channel, (u64)desc->trans_id); 7584d18fcc9SAndres Beltran if (cmd_rqst == VMBUS_RQST_ERROR) { 7594d18fcc9SAndres Beltran netdev_err(ndev, "Incorrect transaction id\n"); 7604d18fcc9SAndres Beltran return; 7614d18fcc9SAndres Beltran } 7624d18fcc9SAndres Beltran 7634d18fcc9SAndres Beltran skb = (struct sk_buff *)(unsigned long)cmd_rqst; 76433be96e4SHaiyang Zhang 76595fa0405SHaiyang Zhang /* Notify the layer above us */ 766bc304dd3SStephen Hemminger if (likely(skb)) { 767793e3955Sstephen hemminger const struct hv_netvsc_packet *packet 768bc304dd3SStephen Hemminger = (struct hv_netvsc_packet *)skb->cb; 769793e3955Sstephen hemminger u32 send_index = packet->send_buf_index; 770793e3955Sstephen hemminger struct netvsc_stats *tx_stats; 771bc304dd3SStephen Hemminger 772c25aaf81SKY Srinivasan if (send_index != NETVSC_INVALID_INDEX) 773c25aaf81SKY Srinivasan netvsc_free_send_slot(net_device, send_index); 774793e3955Sstephen hemminger q_idx = packet->q_idx; 775bc304dd3SStephen Hemminger 7766c80f3fcSSimon Xiao tx_stats = &net_device->chan_table[q_idx].tx_stats; 777793e3955Sstephen hemminger 778793e3955Sstephen hemminger u64_stats_update_begin(&tx_stats->syncp); 779793e3955Sstephen hemminger tx_stats->packets += packet->total_packets; 780793e3955Sstephen hemminger tx_stats->bytes += packet->total_bytes; 781793e3955Sstephen hemminger u64_stats_update_end(&tx_stats->syncp); 782793e3955Sstephen hemminger 783f9645430Sstephen hemminger napi_consume_skb(skb, budget); 7845b54dac8SHaiyang Zhang } 78595fa0405SHaiyang Zhang 786b8b835a8Sstephen hemminger queue_sends = 787b8b835a8Sstephen hemminger atomic_dec_return(&net_device->chan_table[q_idx].queue_sends); 7881d06825bSHaiyang Zhang 7897b2ee50cSStephen Hemminger if (unlikely(net_device->destroy)) { 7907b2ee50cSStephen Hemminger if (queue_sends == 0) 791dc5cd894SHaiyang Zhang wake_up(&net_device->wait_drain); 7927b2ee50cSStephen Hemminger } else { 7937b2ee50cSStephen Hemminger struct netdev_queue *txq = netdev_get_tx_queue(ndev, q_idx); 794dc5cd894SHaiyang Zhang 7951b704c4aSHaiyang Zhang if (netif_tx_queue_stopped(txq) && !net_device->tx_disable && 7966b1f8376SLong Li (hv_get_avail_to_write_percent(&channel->outbound) > 7976b1f8376SLong Li RING_AVAIL_PERCENT_HIWATER || queue_sends < 1)) { 7987b2ee50cSStephen Hemminger netif_tx_wake_queue(txq); 79909af87d1SSimon Xiao ndev_ctx->eth_stats.wake_queue++; 80009af87d1SSimon Xiao } 801bc304dd3SStephen Hemminger } 8027b2ee50cSStephen Hemminger } 803bc304dd3SStephen Hemminger 804c347b927SStephen Hemminger static void netvsc_send_completion(struct net_device *ndev, 805c347b927SStephen Hemminger struct netvsc_device *net_device, 806bc304dd3SStephen Hemminger struct vmbus_channel *incoming_channel, 807f9645430Sstephen hemminger const struct vmpacket_descriptor *desc, 808f9645430Sstephen hemminger int budget) 809bc304dd3SStephen Hemminger { 8108b31f8c9SLong Li const struct nvsp_message *nvsp_packet; 81144144185SAndres Beltran u32 msglen = hv_pkt_datalen(desc); 8128b31f8c9SLong Li struct nvsp_message *pkt_rqst; 8138b31f8c9SLong Li u64 cmd_rqst; 8148b31f8c9SLong Li 8158b31f8c9SLong Li /* First check if this is a VMBUS completion without data payload */ 8168b31f8c9SLong Li if (!msglen) { 817bf5fd8caSAndrea Parri (Microsoft) cmd_rqst = incoming_channel->request_addr_callback(incoming_channel, 8188b31f8c9SLong Li (u64)desc->trans_id); 8198b31f8c9SLong Li if (cmd_rqst == VMBUS_RQST_ERROR) { 8208b31f8c9SLong Li netdev_err(ndev, "Invalid transaction id\n"); 8218b31f8c9SLong Li return; 8228b31f8c9SLong Li } 8238b31f8c9SLong Li 8248b31f8c9SLong Li pkt_rqst = (struct nvsp_message *)(uintptr_t)cmd_rqst; 8258b31f8c9SLong Li switch (pkt_rqst->hdr.msg_type) { 8268b31f8c9SLong Li case NVSP_MSG4_TYPE_SWITCH_DATA_PATH: 8278b31f8c9SLong Li complete(&net_device->channel_init_wait); 8288b31f8c9SLong Li break; 8298b31f8c9SLong Li 8308b31f8c9SLong Li default: 8318b31f8c9SLong Li netdev_err(ndev, "Unexpected VMBUS completion!!\n"); 8328b31f8c9SLong Li } 8338b31f8c9SLong Li return; 8348b31f8c9SLong Li } 83544144185SAndres Beltran 83644144185SAndres Beltran /* Ensure packet is big enough to read header fields */ 83744144185SAndres Beltran if (msglen < sizeof(struct nvsp_message_header)) { 83844144185SAndres Beltran netdev_err(ndev, "nvsp_message length too small: %u\n", msglen); 83944144185SAndres Beltran return; 84044144185SAndres Beltran } 841bc304dd3SStephen Hemminger 8428b31f8c9SLong Li nvsp_packet = hv_pkt_data(desc); 843bc304dd3SStephen Hemminger switch (nvsp_packet->hdr.msg_type) { 844bc304dd3SStephen Hemminger case NVSP_MSG_TYPE_INIT_COMPLETE: 84544144185SAndres Beltran if (msglen < sizeof(struct nvsp_message_header) + 84644144185SAndres Beltran sizeof(struct nvsp_message_init_complete)) { 84744144185SAndres Beltran netdev_err(ndev, "nvsp_msg length too small: %u\n", 84844144185SAndres Beltran msglen); 84944144185SAndres Beltran return; 85044144185SAndres Beltran } 85144144185SAndres Beltran fallthrough; 85244144185SAndres Beltran 853bc304dd3SStephen Hemminger case NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE: 85444144185SAndres Beltran if (msglen < sizeof(struct nvsp_message_header) + 85544144185SAndres Beltran sizeof(struct nvsp_1_message_send_receive_buffer_complete)) { 85644144185SAndres Beltran netdev_err(ndev, "nvsp_msg1 length too small: %u\n", 85744144185SAndres Beltran msglen); 85844144185SAndres Beltran return; 85944144185SAndres Beltran } 86044144185SAndres Beltran fallthrough; 86144144185SAndres Beltran 862bc304dd3SStephen Hemminger case NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE: 86344144185SAndres Beltran if (msglen < sizeof(struct nvsp_message_header) + 86444144185SAndres Beltran sizeof(struct nvsp_1_message_send_send_buffer_complete)) { 86544144185SAndres Beltran netdev_err(ndev, "nvsp_msg1 length too small: %u\n", 86644144185SAndres Beltran msglen); 86744144185SAndres Beltran return; 86844144185SAndres Beltran } 86944144185SAndres Beltran fallthrough; 87044144185SAndres Beltran 871bc304dd3SStephen Hemminger case NVSP_MSG5_TYPE_SUBCHANNEL: 87244144185SAndres Beltran if (msglen < sizeof(struct nvsp_message_header) + 87344144185SAndres Beltran sizeof(struct nvsp_5_subchannel_complete)) { 87444144185SAndres Beltran netdev_err(ndev, "nvsp_msg5 length too small: %u\n", 87544144185SAndres Beltran msglen); 87644144185SAndres Beltran return; 87744144185SAndres Beltran } 878bc304dd3SStephen Hemminger /* Copy the response back */ 879bc304dd3SStephen Hemminger memcpy(&net_device->channel_init_pkt, nvsp_packet, 880bc304dd3SStephen Hemminger sizeof(struct nvsp_message)); 881bc304dd3SStephen Hemminger complete(&net_device->channel_init_wait); 882bc304dd3SStephen Hemminger break; 883bc304dd3SStephen Hemminger 884bc304dd3SStephen Hemminger case NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE: 885c347b927SStephen Hemminger netvsc_send_tx_complete(ndev, net_device, incoming_channel, 886c347b927SStephen Hemminger desc, budget); 887bc304dd3SStephen Hemminger break; 888bc304dd3SStephen Hemminger 889bc304dd3SStephen Hemminger default: 890bc304dd3SStephen Hemminger netdev_err(ndev, 891bc304dd3SStephen Hemminger "Unknown send completion type %d received!!\n", 892bc304dd3SStephen Hemminger nvsp_packet->hdr.msg_type); 89395fa0405SHaiyang Zhang } 89495fa0405SHaiyang Zhang } 89595fa0405SHaiyang Zhang 896c25aaf81SKY Srinivasan static u32 netvsc_get_next_send_section(struct netvsc_device *net_device) 897c25aaf81SKY Srinivasan { 898b58a1858Sstephen hemminger unsigned long *map_addr = net_device->send_section_map; 899b58a1858Sstephen hemminger unsigned int i; 900c25aaf81SKY Srinivasan 901fdfb70d2Sstephen hemminger for_each_clear_bit(i, map_addr, net_device->send_section_cnt) { 902b58a1858Sstephen hemminger if (sync_test_and_set_bit(i, map_addr) == 0) 903b58a1858Sstephen hemminger return i; 904c25aaf81SKY Srinivasan } 905b58a1858Sstephen hemminger 906b58a1858Sstephen hemminger return NETVSC_INVALID_INDEX; 907c25aaf81SKY Srinivasan } 908c25aaf81SKY Srinivasan 90926a11262SStephen Hemminger static void netvsc_copy_to_send_buf(struct netvsc_device *net_device, 910c25aaf81SKY Srinivasan unsigned int section_index, 9117c3877f2SHaiyang Zhang u32 pend_size, 91224476760SKY Srinivasan struct hv_netvsc_packet *packet, 913a9f2e2d6SKY Srinivasan struct rndis_message *rndis_msg, 91402b6de01Sstephen hemminger struct hv_page_buffer *pb, 915cfd8afd9SStephen Hemminger bool xmit_more) 916c25aaf81SKY Srinivasan { 917c25aaf81SKY Srinivasan char *start = net_device->send_buf; 9187c3877f2SHaiyang Zhang char *dest = start + (section_index * net_device->send_section_size) 9197c3877f2SHaiyang Zhang + pend_size; 920c25aaf81SKY Srinivasan int i; 9217c3877f2SHaiyang Zhang u32 padding = 0; 922aa0a34beSHaiyang Zhang u32 page_count = packet->cp_partial ? packet->rmsg_pgcnt : 923aa0a34beSHaiyang Zhang packet->page_buf_cnt; 924b85e06f7SStephen Hemminger u32 remain; 9257c3877f2SHaiyang Zhang 9267c3877f2SHaiyang Zhang /* Add padding */ 927b85e06f7SStephen Hemminger remain = packet->total_data_buflen & (net_device->pkt_align - 1); 928cfd8afd9SStephen Hemminger if (xmit_more && remain) { 9297c3877f2SHaiyang Zhang padding = net_device->pkt_align - remain; 93024476760SKY Srinivasan rndis_msg->msg_len += padding; 9317c3877f2SHaiyang Zhang packet->total_data_buflen += padding; 9327c3877f2SHaiyang Zhang } 933c25aaf81SKY Srinivasan 934aa0a34beSHaiyang Zhang for (i = 0; i < page_count; i++) { 93511d8620eSBoqun Feng char *src = phys_to_virt(pb[i].pfn << HV_HYP_PAGE_SHIFT); 93602b6de01Sstephen hemminger u32 offset = pb[i].offset; 93702b6de01Sstephen hemminger u32 len = pb[i].len; 938c25aaf81SKY Srinivasan 939c25aaf81SKY Srinivasan memcpy(dest, (src + offset), len); 940c25aaf81SKY Srinivasan dest += len; 941c25aaf81SKY Srinivasan } 9427c3877f2SHaiyang Zhang 94326a11262SStephen Hemminger if (padding) 9447c3877f2SHaiyang Zhang memset(dest, 0, padding); 945c25aaf81SKY Srinivasan } 946c25aaf81SKY Srinivasan 9473a8963acSStephen Hemminger static inline int netvsc_send_pkt( 9480a1275caSVitaly Kuznetsov struct hv_device *device, 9497c3877f2SHaiyang Zhang struct hv_netvsc_packet *packet, 950a9f2e2d6SKY Srinivasan struct netvsc_device *net_device, 95102b6de01Sstephen hemminger struct hv_page_buffer *pb, 9523a3d9a0aSKY Srinivasan struct sk_buff *skb) 95395fa0405SHaiyang Zhang { 9547c3877f2SHaiyang Zhang struct nvsp_message nvmsg; 955ec966381SStephen Hemminger struct nvsp_1_message_send_rndis_packet *rpkt = 956956a25c9SJoe Perches &nvmsg.msg.v1_msg.send_rndis_pkt; 957956a25c9SJoe Perches struct netvsc_channel * const nvchan = 958956a25c9SJoe Perches &net_device->chan_table[packet->q_idx]; 959b8b835a8Sstephen hemminger struct vmbus_channel *out_channel = nvchan->channel; 9600a1275caSVitaly Kuznetsov struct net_device *ndev = hv_get_drvdata(device); 96109af87d1SSimon Xiao struct net_device_context *ndev_ctx = netdev_priv(ndev); 962b8b835a8Sstephen hemminger struct netdev_queue *txq = netdev_get_tx_queue(ndev, packet->q_idx); 9637c3877f2SHaiyang Zhang u64 req_id; 9647c3877f2SHaiyang Zhang int ret; 9656b1f8376SLong Li u32 ring_avail = hv_get_avail_to_write_percent(&out_channel->outbound); 966c25aaf81SKY Srinivasan 967505e3f00SAndrea Parri (Microsoft) memset(&nvmsg, 0, sizeof(struct nvsp_message)); 9687c3877f2SHaiyang Zhang nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT; 969956a25c9SJoe Perches if (skb) 970956a25c9SJoe Perches rpkt->channel_type = 0; /* 0 is RMC_DATA */ 9717c3877f2SHaiyang Zhang else 972956a25c9SJoe Perches rpkt->channel_type = 1; /* 1 is RMC_CONTROL */ 973956a25c9SJoe Perches 974956a25c9SJoe Perches rpkt->send_buf_section_index = packet->send_buf_index; 975956a25c9SJoe Perches if (packet->send_buf_index == NETVSC_INVALID_INDEX) 976956a25c9SJoe Perches rpkt->send_buf_section_size = 0; 977956a25c9SJoe Perches else 978956a25c9SJoe Perches rpkt->send_buf_section_size = packet->total_data_buflen; 97995fa0405SHaiyang Zhang 9803a3d9a0aSKY Srinivasan req_id = (ulong)skb; 981f1ea3cd7SHaiyang Zhang 982c3582a2cSHaiyang Zhang if (out_channel->rescind) 983c3582a2cSHaiyang Zhang return -ENODEV; 984c3582a2cSHaiyang Zhang 985ec966381SStephen Hemminger trace_nvsp_send_pkt(ndev, out_channel, rpkt); 986ec966381SStephen Hemminger 98795fa0405SHaiyang Zhang if (packet->page_buf_cnt) { 98802b6de01Sstephen hemminger if (packet->cp_partial) 98902b6de01Sstephen hemminger pb += packet->rmsg_pgcnt; 99002b6de01Sstephen hemminger 9915a668d8cSstephen hemminger ret = vmbus_sendpacket_pagebuffer(out_channel, 99202b6de01Sstephen hemminger pb, packet->page_buf_cnt, 9935a668d8cSstephen hemminger &nvmsg, sizeof(nvmsg), 9945a668d8cSstephen hemminger req_id); 99595fa0405SHaiyang Zhang } else { 9965dd0fb9bSstephen hemminger ret = vmbus_sendpacket(out_channel, 9975dd0fb9bSstephen hemminger &nvmsg, sizeof(nvmsg), 9985dd0fb9bSstephen hemminger req_id, VM_PKT_DATA_INBAND, 9993454323cSStephen Hemminger VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 100095fa0405SHaiyang Zhang } 100195fa0405SHaiyang Zhang 10021d06825bSHaiyang Zhang if (ret == 0) { 1003b8b835a8Sstephen hemminger atomic_inc_return(&nvchan->queue_sends); 10045b54dac8SHaiyang Zhang 100509af87d1SSimon Xiao if (ring_avail < RING_AVAIL_PERCENT_LOWATER) { 1006b8b835a8Sstephen hemminger netif_tx_stop_queue(txq); 100709af87d1SSimon Xiao ndev_ctx->eth_stats.stop_queue++; 100809af87d1SSimon Xiao } 10091d06825bSHaiyang Zhang } else if (ret == -EAGAIN) { 1010b8b835a8Sstephen hemminger netif_tx_stop_queue(txq); 101109af87d1SSimon Xiao ndev_ctx->eth_stats.stop_queue++; 10121d06825bSHaiyang Zhang } else { 10134a2176c6Sstephen hemminger netdev_err(ndev, 10144a2176c6Sstephen hemminger "Unable to send packet pages %u len %u, ret %d\n", 10154a2176c6Sstephen hemminger packet->page_buf_cnt, packet->total_data_buflen, 10164a2176c6Sstephen hemminger ret); 10171d06825bSHaiyang Zhang } 101895fa0405SHaiyang Zhang 101993aa4792SHaiyang Zhang if (netif_tx_queue_stopped(txq) && 102093aa4792SHaiyang Zhang atomic_read(&nvchan->queue_sends) < 1 && 102193aa4792SHaiyang Zhang !net_device->tx_disable) { 102293aa4792SHaiyang Zhang netif_tx_wake_queue(txq); 102393aa4792SHaiyang Zhang ndev_ctx->eth_stats.wake_queue++; 102493aa4792SHaiyang Zhang if (ret == -EAGAIN) 102593aa4792SHaiyang Zhang ret = -ENOSPC; 102693aa4792SHaiyang Zhang } 102793aa4792SHaiyang Zhang 10287c3877f2SHaiyang Zhang return ret; 10297c3877f2SHaiyang Zhang } 10307c3877f2SHaiyang Zhang 1031c85e4924SHaiyang Zhang /* Move packet out of multi send data (msd), and clear msd */ 1032c85e4924SHaiyang Zhang static inline void move_pkt_msd(struct hv_netvsc_packet **msd_send, 1033c85e4924SHaiyang Zhang struct sk_buff **msd_skb, 1034c85e4924SHaiyang Zhang struct multi_send_data *msdp) 1035c85e4924SHaiyang Zhang { 1036c85e4924SHaiyang Zhang *msd_skb = msdp->skb; 1037c85e4924SHaiyang Zhang *msd_send = msdp->pkt; 1038c85e4924SHaiyang Zhang msdp->skb = NULL; 1039c85e4924SHaiyang Zhang msdp->pkt = NULL; 1040c85e4924SHaiyang Zhang msdp->count = 0; 1041c85e4924SHaiyang Zhang } 1042c85e4924SHaiyang Zhang 10432a926f79Sstephen hemminger /* RCU already held by caller */ 1044bd49fea7SShachar Raindel /* Batching/bouncing logic is designed to attempt to optimize 1045bd49fea7SShachar Raindel * performance. 1046bd49fea7SShachar Raindel * 1047bd49fea7SShachar Raindel * For small, non-LSO packets we copy the packet to a send buffer 1048bd49fea7SShachar Raindel * which is pre-registered with the Hyper-V side. This enables the 1049bd49fea7SShachar Raindel * hypervisor to avoid remapping the aperture to access the packet 1050bd49fea7SShachar Raindel * descriptor and data. 1051bd49fea7SShachar Raindel * 1052bd49fea7SShachar Raindel * If we already started using a buffer and the netdev is transmitting 1053bd49fea7SShachar Raindel * a burst of packets, keep on copying into the buffer until it is 1054bd49fea7SShachar Raindel * full or we are done collecting a burst. If there is an existing 1055bd49fea7SShachar Raindel * buffer with space for the RNDIS descriptor but not the packet, copy 1056bd49fea7SShachar Raindel * the RNDIS descriptor to the buffer, keeping the packet in place. 1057bd49fea7SShachar Raindel * 1058bd49fea7SShachar Raindel * If we do batching and send more than one packet using a single 1059bd49fea7SShachar Raindel * NetVSC message, free the SKBs of the packets copied, except for the 1060bd49fea7SShachar Raindel * last packet. This is done to streamline the handling of the case 1061bd49fea7SShachar Raindel * where the last packet only had the RNDIS descriptor copied to the 1062bd49fea7SShachar Raindel * send buffer, with the data pointers included in the NetVSC message. 1063bd49fea7SShachar Raindel */ 1064cfd8afd9SStephen Hemminger int netvsc_send(struct net_device *ndev, 106524476760SKY Srinivasan struct hv_netvsc_packet *packet, 1066a9f2e2d6SKY Srinivasan struct rndis_message *rndis_msg, 106702b6de01Sstephen hemminger struct hv_page_buffer *pb, 1068351e1581SHaiyang Zhang struct sk_buff *skb, 1069351e1581SHaiyang Zhang bool xdp_tx) 10707c3877f2SHaiyang Zhang { 1071cfd8afd9SStephen Hemminger struct net_device_context *ndev_ctx = netdev_priv(ndev); 10723962981fSstephen hemminger struct netvsc_device *net_device 1073867047c4Sstephen hemminger = rcu_dereference_bh(ndev_ctx->nvdev); 10742a926f79Sstephen hemminger struct hv_device *device = ndev_ctx->device_ctx; 10756c4c137eSStephen Hemminger int ret = 0; 1076b8b835a8Sstephen hemminger struct netvsc_channel *nvchan; 10777c3877f2SHaiyang Zhang u32 pktlen = packet->total_data_buflen, msd_len = 0; 10787c3877f2SHaiyang Zhang unsigned int section_index = NETVSC_INVALID_INDEX; 10797c3877f2SHaiyang Zhang struct multi_send_data *msdp; 10807c3877f2SHaiyang Zhang struct hv_netvsc_packet *msd_send = NULL, *cur_send = NULL; 1081c85e4924SHaiyang Zhang struct sk_buff *msd_skb = NULL; 1082cfd8afd9SStephen Hemminger bool try_batch, xmit_more; 10837c3877f2SHaiyang Zhang 1084592b4fe8Sstephen hemminger /* If device is rescinded, return error and packet will get dropped. */ 10852a926f79Sstephen hemminger if (unlikely(!net_device || net_device->destroy)) 10867c3877f2SHaiyang Zhang return -ENODEV; 10877c3877f2SHaiyang Zhang 1088b8b835a8Sstephen hemminger nvchan = &net_device->chan_table[packet->q_idx]; 10897c3877f2SHaiyang Zhang packet->send_buf_index = NETVSC_INVALID_INDEX; 1090aa0a34beSHaiyang Zhang packet->cp_partial = false; 10917c3877f2SHaiyang Zhang 1092351e1581SHaiyang Zhang /* Send a control message or XDP packet directly without accessing 1093351e1581SHaiyang Zhang * msd (Multi-Send Data) field which may be changed during data packet 1094351e1581SHaiyang Zhang * processing. 1095cf8190e4SHaiyang Zhang */ 1096351e1581SHaiyang Zhang if (!skb || xdp_tx) 109712f69661SStephen Hemminger return netvsc_send_pkt(device, packet, net_device, pb, skb); 1098cf8190e4SHaiyang Zhang 10997c3877f2SHaiyang Zhang /* batch packets in send buffer if possible */ 1100b8b835a8Sstephen hemminger msdp = &nvchan->msd; 11017c3877f2SHaiyang Zhang if (msdp->pkt) 11027c3877f2SHaiyang Zhang msd_len = msdp->pkt->total_data_buflen; 11037c3877f2SHaiyang Zhang 1104ebc1dcf6Sstephen hemminger try_batch = msd_len > 0 && msdp->count < net_device->max_pkt; 1105aa0a34beSHaiyang Zhang if (try_batch && msd_len + pktlen + net_device->pkt_align < 11067c3877f2SHaiyang Zhang net_device->send_section_size) { 11077c3877f2SHaiyang Zhang section_index = msdp->pkt->send_buf_index; 11087c3877f2SHaiyang Zhang 1109aa0a34beSHaiyang Zhang } else if (try_batch && msd_len + packet->rmsg_size < 1110aa0a34beSHaiyang Zhang net_device->send_section_size) { 1111aa0a34beSHaiyang Zhang section_index = msdp->pkt->send_buf_index; 1112aa0a34beSHaiyang Zhang packet->cp_partial = true; 1113aa0a34beSHaiyang Zhang 1114ebc1dcf6Sstephen hemminger } else if (pktlen + net_device->pkt_align < 11157c3877f2SHaiyang Zhang net_device->send_section_size) { 11167c3877f2SHaiyang Zhang section_index = netvsc_get_next_send_section(net_device); 1117cad5c197Sstephen hemminger if (unlikely(section_index == NETVSC_INVALID_INDEX)) { 1118cad5c197Sstephen hemminger ++ndev_ctx->eth_stats.tx_send_full; 1119cad5c197Sstephen hemminger } else { 1120c85e4924SHaiyang Zhang move_pkt_msd(&msd_send, &msd_skb, msdp); 11217c3877f2SHaiyang Zhang msd_len = 0; 11227c3877f2SHaiyang Zhang } 11237c3877f2SHaiyang Zhang } 11247c3877f2SHaiyang Zhang 1125cfd8afd9SStephen Hemminger /* Keep aggregating only if stack says more data is coming 1126cfd8afd9SStephen Hemminger * and not doing mixed modes send and not flow blocked 1127cfd8afd9SStephen Hemminger */ 11286b16f9eeSFlorian Westphal xmit_more = netdev_xmit_more() && 1129cfd8afd9SStephen Hemminger !packet->cp_partial && 1130cfd8afd9SStephen Hemminger !netif_xmit_stopped(netdev_get_tx_queue(ndev, packet->q_idx)); 1131cfd8afd9SStephen Hemminger 11327c3877f2SHaiyang Zhang if (section_index != NETVSC_INVALID_INDEX) { 11337c3877f2SHaiyang Zhang netvsc_copy_to_send_buf(net_device, 11347c3877f2SHaiyang Zhang section_index, msd_len, 1135cfd8afd9SStephen Hemminger packet, rndis_msg, pb, xmit_more); 1136b08cc791SKY Srinivasan 1137aa0a34beSHaiyang Zhang packet->send_buf_index = section_index; 1138aa0a34beSHaiyang Zhang 1139aa0a34beSHaiyang Zhang if (packet->cp_partial) { 1140aa0a34beSHaiyang Zhang packet->page_buf_cnt -= packet->rmsg_pgcnt; 1141aa0a34beSHaiyang Zhang packet->total_data_buflen = msd_len + packet->rmsg_size; 1142aa0a34beSHaiyang Zhang } else { 1143aa0a34beSHaiyang Zhang packet->page_buf_cnt = 0; 1144aa0a34beSHaiyang Zhang packet->total_data_buflen += msd_len; 1145aa0a34beSHaiyang Zhang } 11467c3877f2SHaiyang Zhang 1147793e3955Sstephen hemminger if (msdp->pkt) { 1148793e3955Sstephen hemminger packet->total_packets += msdp->pkt->total_packets; 1149793e3955Sstephen hemminger packet->total_bytes += msdp->pkt->total_bytes; 1150793e3955Sstephen hemminger } 1151793e3955Sstephen hemminger 1152c85e4924SHaiyang Zhang if (msdp->skb) 115317db4bceSStephen Hemminger dev_consume_skb_any(msdp->skb); 1154ee90b812SHaiyang Zhang 1155cfd8afd9SStephen Hemminger if (xmit_more) { 1156c85e4924SHaiyang Zhang msdp->skb = skb; 11577c3877f2SHaiyang Zhang msdp->pkt = packet; 11587c3877f2SHaiyang Zhang msdp->count++; 11597c3877f2SHaiyang Zhang } else { 11607c3877f2SHaiyang Zhang cur_send = packet; 1161c85e4924SHaiyang Zhang msdp->skb = NULL; 11627c3877f2SHaiyang Zhang msdp->pkt = NULL; 11637c3877f2SHaiyang Zhang msdp->count = 0; 11647c3877f2SHaiyang Zhang } 11657c3877f2SHaiyang Zhang } else { 1166c85e4924SHaiyang Zhang move_pkt_msd(&msd_send, &msd_skb, msdp); 11677c3877f2SHaiyang Zhang cur_send = packet; 11687c3877f2SHaiyang Zhang } 11697c3877f2SHaiyang Zhang 11707c3877f2SHaiyang Zhang if (msd_send) { 11716c4c137eSStephen Hemminger int m_ret = netvsc_send_pkt(device, msd_send, net_device, 11720a1275caSVitaly Kuznetsov NULL, msd_skb); 11737c3877f2SHaiyang Zhang 11747c3877f2SHaiyang Zhang if (m_ret != 0) { 11757c3877f2SHaiyang Zhang netvsc_free_send_slot(net_device, 11767c3877f2SHaiyang Zhang msd_send->send_buf_index); 1177c85e4924SHaiyang Zhang dev_kfree_skb_any(msd_skb); 11787c3877f2SHaiyang Zhang } 11797c3877f2SHaiyang Zhang } 11807c3877f2SHaiyang Zhang 11817c3877f2SHaiyang Zhang if (cur_send) 11820a1275caSVitaly Kuznetsov ret = netvsc_send_pkt(device, cur_send, net_device, pb, skb); 11837c3877f2SHaiyang Zhang 11847aab5159SJerry Snitselaar if (ret != 0 && section_index != NETVSC_INVALID_INDEX) 1185d953ca4dSHaiyang Zhang netvsc_free_send_slot(net_device, section_index); 1186d953ca4dSHaiyang Zhang 118795fa0405SHaiyang Zhang return ret; 118895fa0405SHaiyang Zhang } 118995fa0405SHaiyang Zhang 11907426b1a5Sstephen hemminger /* Send pending recv completions */ 1191cad5c197Sstephen hemminger static int send_recv_completions(struct net_device *ndev, 1192cad5c197Sstephen hemminger struct netvsc_device *nvdev, 1193cad5c197Sstephen hemminger struct netvsc_channel *nvchan) 119495fa0405SHaiyang Zhang { 11957426b1a5Sstephen hemminger struct multi_recv_comp *mrc = &nvchan->mrc; 11967426b1a5Sstephen hemminger struct recv_comp_msg { 11977426b1a5Sstephen hemminger struct nvsp_message_header hdr; 11987426b1a5Sstephen hemminger u32 status; 11997426b1a5Sstephen hemminger } __packed; 12007426b1a5Sstephen hemminger struct recv_comp_msg msg = { 12017426b1a5Sstephen hemminger .hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE, 12027426b1a5Sstephen hemminger }; 120395fa0405SHaiyang Zhang int ret; 120495fa0405SHaiyang Zhang 12057426b1a5Sstephen hemminger while (mrc->first != mrc->next) { 12067426b1a5Sstephen hemminger const struct recv_comp_data *rcd 12077426b1a5Sstephen hemminger = mrc->slots + mrc->first; 120895fa0405SHaiyang Zhang 12097426b1a5Sstephen hemminger msg.status = rcd->status; 12107426b1a5Sstephen hemminger ret = vmbus_sendpacket(nvchan->channel, &msg, sizeof(msg), 12117426b1a5Sstephen hemminger rcd->tid, VM_PKT_COMP, 0); 1212cad5c197Sstephen hemminger if (unlikely(ret)) { 1213cad5c197Sstephen hemminger struct net_device_context *ndev_ctx = netdev_priv(ndev); 1214cad5c197Sstephen hemminger 1215cad5c197Sstephen hemminger ++ndev_ctx->eth_stats.rx_comp_busy; 1216c0b558e5SHaiyang Zhang return ret; 1217cad5c197Sstephen hemminger } 12187426b1a5Sstephen hemminger 12197426b1a5Sstephen hemminger if (++mrc->first == nvdev->recv_completion_cnt) 12207426b1a5Sstephen hemminger mrc->first = 0; 122195fa0405SHaiyang Zhang } 1222c0b558e5SHaiyang Zhang 12237426b1a5Sstephen hemminger /* receive completion ring has been emptied */ 12247426b1a5Sstephen hemminger if (unlikely(nvdev->destroy)) 12257426b1a5Sstephen hemminger wake_up(&nvdev->wait_drain); 12267426b1a5Sstephen hemminger 12277426b1a5Sstephen hemminger return 0; 12287426b1a5Sstephen hemminger } 12297426b1a5Sstephen hemminger 12307426b1a5Sstephen hemminger /* Count how many receive completions are outstanding */ 12317426b1a5Sstephen hemminger static void recv_comp_slot_avail(const struct netvsc_device *nvdev, 12327426b1a5Sstephen hemminger const struct multi_recv_comp *mrc, 1233c0b558e5SHaiyang Zhang u32 *filled, u32 *avail) 1234c0b558e5SHaiyang Zhang { 12357426b1a5Sstephen hemminger u32 count = nvdev->recv_completion_cnt; 1236c0b558e5SHaiyang Zhang 12377426b1a5Sstephen hemminger if (mrc->next >= mrc->first) 12387426b1a5Sstephen hemminger *filled = mrc->next - mrc->first; 12397426b1a5Sstephen hemminger else 12407426b1a5Sstephen hemminger *filled = (count - mrc->first) + mrc->next; 1241c0b558e5SHaiyang Zhang 12427426b1a5Sstephen hemminger *avail = count - *filled - 1; 124395fa0405SHaiyang Zhang } 1244c0b558e5SHaiyang Zhang 12457426b1a5Sstephen hemminger /* Add receive complete to ring to send to host. */ 12467426b1a5Sstephen hemminger static void enq_receive_complete(struct net_device *ndev, 12477426b1a5Sstephen hemminger struct netvsc_device *nvdev, u16 q_idx, 12487426b1a5Sstephen hemminger u64 tid, u32 status) 1249c0b558e5SHaiyang Zhang { 12507426b1a5Sstephen hemminger struct netvsc_channel *nvchan = &nvdev->chan_table[q_idx]; 12517426b1a5Sstephen hemminger struct multi_recv_comp *mrc = &nvchan->mrc; 12527426b1a5Sstephen hemminger struct recv_comp_data *rcd; 1253c0b558e5SHaiyang Zhang u32 filled, avail; 1254c0b558e5SHaiyang Zhang 12557426b1a5Sstephen hemminger recv_comp_slot_avail(nvdev, mrc, &filled, &avail); 1256c0b558e5SHaiyang Zhang 12577426b1a5Sstephen hemminger if (unlikely(filled > NAPI_POLL_WEIGHT)) { 1258cad5c197Sstephen hemminger send_recv_completions(ndev, nvdev, nvchan); 12597426b1a5Sstephen hemminger recv_comp_slot_avail(nvdev, mrc, &filled, &avail); 1260c0b558e5SHaiyang Zhang } 1261c0b558e5SHaiyang Zhang 12627426b1a5Sstephen hemminger if (unlikely(!avail)) { 12637426b1a5Sstephen hemminger netdev_err(ndev, "Recv_comp full buf q:%hd, tid:%llx\n", 12647426b1a5Sstephen hemminger q_idx, tid); 12657426b1a5Sstephen hemminger return; 1266c0b558e5SHaiyang Zhang } 1267c0b558e5SHaiyang Zhang 12687426b1a5Sstephen hemminger rcd = mrc->slots + mrc->next; 12697426b1a5Sstephen hemminger rcd->tid = tid; 12707426b1a5Sstephen hemminger rcd->status = status; 1271c0b558e5SHaiyang Zhang 12727426b1a5Sstephen hemminger if (++mrc->next == nvdev->recv_completion_cnt) 12737426b1a5Sstephen hemminger mrc->next = 0; 127495fa0405SHaiyang Zhang } 127595fa0405SHaiyang Zhang 127615a863bfSstephen hemminger static int netvsc_receive(struct net_device *ndev, 1277dc54a08cSstephen hemminger struct netvsc_device *net_device, 1278c8e4eff4SHaiyang Zhang struct netvsc_channel *nvchan, 127944144185SAndres Beltran const struct vmpacket_descriptor *desc) 128095fa0405SHaiyang Zhang { 1281c347b927SStephen Hemminger struct net_device_context *net_device_ctx = netdev_priv(ndev); 1282c8e4eff4SHaiyang Zhang struct vmbus_channel *channel = nvchan->channel; 1283f3dd3f47Sstephen hemminger const struct vmtransfer_page_packet_header *vmxferpage_packet 1284f3dd3f47Sstephen hemminger = container_of(desc, const struct vmtransfer_page_packet_header, d); 128544144185SAndres Beltran const struct nvsp_message *nvsp = hv_pkt_data(desc); 128644144185SAndres Beltran u32 msglen = hv_pkt_datalen(desc); 128715a863bfSstephen hemminger u16 q_idx = channel->offermsg.offer.sub_channel_index; 1288dc54a08cSstephen hemminger char *recv_buf = net_device->recv_buf; 12894baab261SHaiyang Zhang u32 status = NVSP_STAT_SUCCESS; 129045326342SHaiyang Zhang int i; 129145326342SHaiyang Zhang int count = 0; 129295fa0405SHaiyang Zhang 129344144185SAndres Beltran /* Ensure packet is big enough to read header fields */ 129444144185SAndres Beltran if (msglen < sizeof(struct nvsp_message_header)) { 129544144185SAndres Beltran netif_err(net_device_ctx, rx_err, ndev, 129644144185SAndres Beltran "invalid nvsp header, length too small: %u\n", 129744144185SAndres Beltran msglen); 129844144185SAndres Beltran return 0; 129944144185SAndres Beltran } 130044144185SAndres Beltran 130195fa0405SHaiyang Zhang /* Make sure this is a valid nvsp packet */ 1302dc54a08cSstephen hemminger if (unlikely(nvsp->hdr.msg_type != NVSP_MSG1_TYPE_SEND_RNDIS_PKT)) { 1303dc54a08cSstephen hemminger netif_err(net_device_ctx, rx_err, ndev, 1304dc54a08cSstephen hemminger "Unknown nvsp packet type received %u\n", 1305dc54a08cSstephen hemminger nvsp->hdr.msg_type); 130615a863bfSstephen hemminger return 0; 130795fa0405SHaiyang Zhang } 130895fa0405SHaiyang Zhang 130944144185SAndres Beltran /* Validate xfer page pkt header */ 131044144185SAndres Beltran if ((desc->offset8 << 3) < sizeof(struct vmtransfer_page_packet_header)) { 131144144185SAndres Beltran netif_err(net_device_ctx, rx_err, ndev, 131244144185SAndres Beltran "Invalid xfer page pkt, offset too small: %u\n", 131344144185SAndres Beltran desc->offset8 << 3); 131444144185SAndres Beltran return 0; 131544144185SAndres Beltran } 131644144185SAndres Beltran 1317dc54a08cSstephen hemminger if (unlikely(vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID)) { 1318dc54a08cSstephen hemminger netif_err(net_device_ctx, rx_err, ndev, 1319dc54a08cSstephen hemminger "Invalid xfer page set id - expecting %x got %x\n", 1320dc54a08cSstephen hemminger NETVSC_RECEIVE_BUFFER_ID, 132195fa0405SHaiyang Zhang vmxferpage_packet->xfer_pageset_id); 132215a863bfSstephen hemminger return 0; 132395fa0405SHaiyang Zhang } 132495fa0405SHaiyang Zhang 13254baab261SHaiyang Zhang count = vmxferpage_packet->range_cnt; 132695fa0405SHaiyang Zhang 132744144185SAndres Beltran /* Check count for a valid value */ 132844144185SAndres Beltran if (NETVSC_XFER_HEADER_SIZE(count) > desc->offset8 << 3) { 132944144185SAndres Beltran netif_err(net_device_ctx, rx_err, ndev, 133044144185SAndres Beltran "Range count is not valid: %d\n", 133144144185SAndres Beltran count); 133244144185SAndres Beltran return 0; 133344144185SAndres Beltran } 133444144185SAndres Beltran 133595fa0405SHaiyang Zhang /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */ 13364baab261SHaiyang Zhang for (i = 0; i < count; i++) { 1337c5d24bddSHaiyang Zhang u32 offset = vmxferpage_packet->ranges[i].byte_offset; 1338dc54a08cSstephen hemminger u32 buflen = vmxferpage_packet->ranges[i].byte_count; 1339c5d24bddSHaiyang Zhang void *data; 13405c71dadbSHaiyang Zhang int ret; 134195fa0405SHaiyang Zhang 134244144185SAndres Beltran if (unlikely(offset > net_device->recv_buf_size || 134344144185SAndres Beltran buflen > net_device->recv_buf_size - offset)) { 1344c8e4eff4SHaiyang Zhang nvchan->rsc.cnt = 0; 1345c5d24bddSHaiyang Zhang status = NVSP_STAT_FAIL; 1346c5d24bddSHaiyang Zhang netif_err(net_device_ctx, rx_err, ndev, 1347c5d24bddSHaiyang Zhang "Packet offset:%u + len:%u too big\n", 1348c5d24bddSHaiyang Zhang offset, buflen); 1349c5d24bddSHaiyang Zhang 1350c5d24bddSHaiyang Zhang continue; 1351c5d24bddSHaiyang Zhang } 1352c5d24bddSHaiyang Zhang 13530ba35fe9SAndrea Parri (Microsoft) /* We're going to copy (sections of) the packet into nvchan->recv_buf; 13540ba35fe9SAndrea Parri (Microsoft) * make sure that nvchan->recv_buf is large enough to hold the packet. 13550ba35fe9SAndrea Parri (Microsoft) */ 13560ba35fe9SAndrea Parri (Microsoft) if (unlikely(buflen > net_device->recv_section_size)) { 13570ba35fe9SAndrea Parri (Microsoft) nvchan->rsc.cnt = 0; 13580ba35fe9SAndrea Parri (Microsoft) status = NVSP_STAT_FAIL; 13590ba35fe9SAndrea Parri (Microsoft) netif_err(net_device_ctx, rx_err, ndev, 13600ba35fe9SAndrea Parri (Microsoft) "Packet too big: buflen=%u recv_section_size=%u\n", 13610ba35fe9SAndrea Parri (Microsoft) buflen, net_device->recv_section_size); 13620ba35fe9SAndrea Parri (Microsoft) 13630ba35fe9SAndrea Parri (Microsoft) continue; 13640ba35fe9SAndrea Parri (Microsoft) } 13650ba35fe9SAndrea Parri (Microsoft) 1366c5d24bddSHaiyang Zhang data = recv_buf + offset; 1367c5d24bddSHaiyang Zhang 1368c8e4eff4SHaiyang Zhang nvchan->rsc.is_last = (i == count - 1); 1369c8e4eff4SHaiyang Zhang 1370ec966381SStephen Hemminger trace_rndis_recv(ndev, q_idx, data); 1371ec966381SStephen Hemminger 137295fa0405SHaiyang Zhang /* Pass it to the upper layer */ 13735c71dadbSHaiyang Zhang ret = rndis_filter_receive(ndev, net_device, 1374c8e4eff4SHaiyang Zhang nvchan, data, buflen); 13755c71dadbSHaiyang Zhang 137612bc8dfbSAndrea Parri (Microsoft) if (unlikely(ret != NVSP_STAT_SUCCESS)) { 137712bc8dfbSAndrea Parri (Microsoft) /* Drop incomplete packet */ 137812bc8dfbSAndrea Parri (Microsoft) nvchan->rsc.cnt = 0; 13795c71dadbSHaiyang Zhang status = NVSP_STAT_FAIL; 138095fa0405SHaiyang Zhang } 138112bc8dfbSAndrea Parri (Microsoft) } 138295fa0405SHaiyang Zhang 13837426b1a5Sstephen hemminger enq_receive_complete(ndev, net_device, q_idx, 13847426b1a5Sstephen hemminger vmxferpage_packet->d.trans_id, status); 138515a863bfSstephen hemminger 138615a863bfSstephen hemminger return count; 138795fa0405SHaiyang Zhang } 138895fa0405SHaiyang Zhang 1389c347b927SStephen Hemminger static void netvsc_send_table(struct net_device *ndev, 1390171c1fd9SHaiyang Zhang struct netvsc_device *nvscdev, 139171f21959SHaiyang Zhang const struct nvsp_message *nvmsg, 139271f21959SHaiyang Zhang u32 msglen) 13935b54dac8SHaiyang Zhang { 13947ce10124Sstephen hemminger struct net_device_context *net_device_ctx = netdev_priv(ndev); 139571f21959SHaiyang Zhang u32 count, offset, *tab; 1396c347b927SStephen Hemminger int i; 13975b54dac8SHaiyang Zhang 139844144185SAndres Beltran /* Ensure packet is big enough to read send_table fields */ 139944144185SAndres Beltran if (msglen < sizeof(struct nvsp_message_header) + 140044144185SAndres Beltran sizeof(struct nvsp_5_send_indirect_table)) { 140144144185SAndres Beltran netdev_err(ndev, "nvsp_v5_msg length too small: %u\n", msglen); 140244144185SAndres Beltran return; 140344144185SAndres Beltran } 140444144185SAndres Beltran 14055b54dac8SHaiyang Zhang count = nvmsg->msg.v5_msg.send_table.count; 140671f21959SHaiyang Zhang offset = nvmsg->msg.v5_msg.send_table.offset; 140771f21959SHaiyang Zhang 14085b54dac8SHaiyang Zhang if (count != VRSS_SEND_TAB_SIZE) { 14095b54dac8SHaiyang Zhang netdev_err(ndev, "Received wrong send-table size:%u\n", count); 14105b54dac8SHaiyang Zhang return; 14115b54dac8SHaiyang Zhang } 14125b54dac8SHaiyang Zhang 1413171c1fd9SHaiyang Zhang /* If negotiated version <= NVSP_PROTOCOL_VERSION_6, the offset may be 1414171c1fd9SHaiyang Zhang * wrong due to a host bug. So fix the offset here. 1415171c1fd9SHaiyang Zhang */ 1416171c1fd9SHaiyang Zhang if (nvscdev->nvsp_version <= NVSP_PROTOCOL_VERSION_6 && 1417171c1fd9SHaiyang Zhang msglen >= sizeof(struct nvsp_message_header) + 1418171c1fd9SHaiyang Zhang sizeof(union nvsp_6_message_uber) + count * sizeof(u32)) 1419171c1fd9SHaiyang Zhang offset = sizeof(struct nvsp_message_header) + 1420171c1fd9SHaiyang Zhang sizeof(union nvsp_6_message_uber); 1421171c1fd9SHaiyang Zhang 1422171c1fd9SHaiyang Zhang /* Boundary check for all versions */ 1423505e3f00SAndrea Parri (Microsoft) if (msglen < count * sizeof(u32) || offset > msglen - count * sizeof(u32)) { 142471f21959SHaiyang Zhang netdev_err(ndev, "Received send-table offset too big:%u\n", 142571f21959SHaiyang Zhang offset); 142671f21959SHaiyang Zhang return; 142771f21959SHaiyang Zhang } 142871f21959SHaiyang Zhang 142971f21959SHaiyang Zhang tab = (void *)nvmsg + offset; 14305b54dac8SHaiyang Zhang 14315b54dac8SHaiyang Zhang for (i = 0; i < count; i++) 143239e91cfbSHaiyang Zhang net_device_ctx->tx_table[i] = tab[i]; 14335b54dac8SHaiyang Zhang } 14345b54dac8SHaiyang Zhang 1435c347b927SStephen Hemminger static void netvsc_send_vf(struct net_device *ndev, 143644144185SAndres Beltran const struct nvsp_message *nvmsg, 143744144185SAndres Beltran u32 msglen) 143871790a27SHaiyang Zhang { 1439c347b927SStephen Hemminger struct net_device_context *net_device_ctx = netdev_priv(ndev); 1440c347b927SStephen Hemminger 144144144185SAndres Beltran /* Ensure packet is big enough to read its fields */ 144244144185SAndres Beltran if (msglen < sizeof(struct nvsp_message_header) + 144344144185SAndres Beltran sizeof(struct nvsp_4_send_vf_association)) { 144444144185SAndres Beltran netdev_err(ndev, "nvsp_v4_msg length too small: %u\n", msglen); 144544144185SAndres Beltran return; 144644144185SAndres Beltran } 144744144185SAndres Beltran 1448f9a7da91SVitaly Kuznetsov net_device_ctx->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated; 1449f9a7da91SVitaly Kuznetsov net_device_ctx->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial; 145000d7ddbaSStephen Hemminger netdev_info(ndev, "VF slot %u %s\n", 145100d7ddbaSStephen Hemminger net_device_ctx->vf_serial, 145200d7ddbaSStephen Hemminger net_device_ctx->vf_alloc ? "added" : "removed"); 145371790a27SHaiyang Zhang } 145471790a27SHaiyang Zhang 1455c347b927SStephen Hemminger static void netvsc_receive_inband(struct net_device *ndev, 1456171c1fd9SHaiyang Zhang struct netvsc_device *nvscdev, 145744144185SAndres Beltran const struct vmpacket_descriptor *desc) 145871790a27SHaiyang Zhang { 145944144185SAndres Beltran const struct nvsp_message *nvmsg = hv_pkt_data(desc); 146044144185SAndres Beltran u32 msglen = hv_pkt_datalen(desc); 146144144185SAndres Beltran 146244144185SAndres Beltran /* Ensure packet is big enough to read header fields */ 146344144185SAndres Beltran if (msglen < sizeof(struct nvsp_message_header)) { 146444144185SAndres Beltran netdev_err(ndev, "inband nvsp_message length too small: %u\n", msglen); 146544144185SAndres Beltran return; 146644144185SAndres Beltran } 146744144185SAndres Beltran 146871790a27SHaiyang Zhang switch (nvmsg->hdr.msg_type) { 146971790a27SHaiyang Zhang case NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE: 1470171c1fd9SHaiyang Zhang netvsc_send_table(ndev, nvscdev, nvmsg, msglen); 147171790a27SHaiyang Zhang break; 147271790a27SHaiyang Zhang 147371790a27SHaiyang Zhang case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION: 147496854bbdSAndrea Parri (Microsoft) if (hv_is_isolation_supported()) 147596854bbdSAndrea Parri (Microsoft) netdev_err(ndev, "Ignore VF_ASSOCIATION msg from the host supporting isolation\n"); 147696854bbdSAndrea Parri (Microsoft) else 147744144185SAndres Beltran netvsc_send_vf(ndev, nvmsg, msglen); 147871790a27SHaiyang Zhang break; 147971790a27SHaiyang Zhang } 148071790a27SHaiyang Zhang } 148171790a27SHaiyang Zhang 148215a863bfSstephen hemminger static int netvsc_process_raw_pkt(struct hv_device *device, 1483c8e4eff4SHaiyang Zhang struct netvsc_channel *nvchan, 148499a50bb1SK. Y. Srinivasan struct netvsc_device *net_device, 148599a50bb1SK. Y. Srinivasan struct net_device *ndev, 1486f9645430Sstephen hemminger const struct vmpacket_descriptor *desc, 1487f9645430Sstephen hemminger int budget) 148899a50bb1SK. Y. Srinivasan { 1489c8e4eff4SHaiyang Zhang struct vmbus_channel *channel = nvchan->channel; 1490c347b927SStephen Hemminger const struct nvsp_message *nvmsg = hv_pkt_data(desc); 149199a50bb1SK. Y. Srinivasan 1492ec966381SStephen Hemminger trace_nvsp_recv(ndev, channel, nvmsg); 1493ec966381SStephen Hemminger 149499a50bb1SK. Y. Srinivasan switch (desc->type) { 149599a50bb1SK. Y. Srinivasan case VM_PKT_COMP: 149644144185SAndres Beltran netvsc_send_completion(ndev, net_device, channel, desc, budget); 149799a50bb1SK. Y. Srinivasan break; 149899a50bb1SK. Y. Srinivasan 149999a50bb1SK. Y. Srinivasan case VM_PKT_DATA_USING_XFER_PAGES: 150044144185SAndres Beltran return netvsc_receive(ndev, net_device, nvchan, desc); 150199a50bb1SK. Y. Srinivasan break; 150299a50bb1SK. Y. Srinivasan 150399a50bb1SK. Y. Srinivasan case VM_PKT_DATA_INBAND: 150444144185SAndres Beltran netvsc_receive_inband(ndev, net_device, desc); 150599a50bb1SK. Y. Srinivasan break; 150699a50bb1SK. Y. Srinivasan 150799a50bb1SK. Y. Srinivasan default: 150899a50bb1SK. Y. Srinivasan netdev_err(ndev, "unhandled packet type %d, tid %llx\n", 1509f4f1c23dSstephen hemminger desc->type, desc->trans_id); 151099a50bb1SK. Y. Srinivasan break; 151199a50bb1SK. Y. Srinivasan } 151215a863bfSstephen hemminger 151315a863bfSstephen hemminger return 0; 151415a863bfSstephen hemminger } 151515a863bfSstephen hemminger 151615a863bfSstephen hemminger static struct hv_device *netvsc_channel_to_device(struct vmbus_channel *channel) 151715a863bfSstephen hemminger { 151815a863bfSstephen hemminger struct vmbus_channel *primary = channel->primary_channel; 151915a863bfSstephen hemminger 152015a863bfSstephen hemminger return primary ? primary->device_obj : channel->device_obj; 152115a863bfSstephen hemminger } 152215a863bfSstephen hemminger 1523262b7f14Sstephen hemminger /* Network processing softirq 1524262b7f14Sstephen hemminger * Process data in incoming ring buffer from host 1525262b7f14Sstephen hemminger * Stops when ring is empty or budget is met or exceeded. 1526262b7f14Sstephen hemminger */ 152715a863bfSstephen hemminger int netvsc_poll(struct napi_struct *napi, int budget) 152815a863bfSstephen hemminger { 152915a863bfSstephen hemminger struct netvsc_channel *nvchan 153015a863bfSstephen hemminger = container_of(napi, struct netvsc_channel, napi); 153135fbbccfSstephen hemminger struct netvsc_device *net_device = nvchan->net_device; 153215a863bfSstephen hemminger struct vmbus_channel *channel = nvchan->channel; 153315a863bfSstephen hemminger struct hv_device *device = netvsc_channel_to_device(channel); 153415a863bfSstephen hemminger struct net_device *ndev = hv_get_drvdata(device); 153515a863bfSstephen hemminger int work_done = 0; 15366b81b193SHaiyang Zhang int ret; 153715a863bfSstephen hemminger 1538f4f1c23dSstephen hemminger /* If starting a new interval */ 1539f4f1c23dSstephen hemminger if (!nvchan->desc) 1540f4f1c23dSstephen hemminger nvchan->desc = hv_pkt_iter_first(channel); 154115a863bfSstephen hemminger 1542f4f1c23dSstephen hemminger while (nvchan->desc && work_done < budget) { 1543c8e4eff4SHaiyang Zhang work_done += netvsc_process_raw_pkt(device, nvchan, net_device, 1544f9645430Sstephen hemminger ndev, nvchan->desc, budget); 1545f4f1c23dSstephen hemminger nvchan->desc = hv_pkt_iter_next(channel, nvchan->desc); 154615a863bfSstephen hemminger } 154715a863bfSstephen hemminger 15486b81b193SHaiyang Zhang /* Send any pending receive completions */ 15496b81b193SHaiyang Zhang ret = send_recv_completions(ndev, net_device, nvchan); 15506b81b193SHaiyang Zhang 15516b81b193SHaiyang Zhang /* If it did not exhaust NAPI budget this time 1552f4f1c23dSstephen hemminger * and not doing busy poll 1553f4e40363Sstephen hemminger * then re-enable host interrupts 15546b81b193SHaiyang Zhang * and reschedule if ring is not empty 15556b81b193SHaiyang Zhang * or sending receive completion failed. 1556262b7f14Sstephen hemminger */ 15576b81b193SHaiyang Zhang if (work_done < budget && 155815a863bfSstephen hemminger napi_complete_done(napi, work_done) && 15596b81b193SHaiyang Zhang (ret || hv_end_read(&channel->inbound)) && 1560d64e38aeSStephen Hemminger napi_schedule_prep(napi)) { 15617426b1a5Sstephen hemminger hv_begin_read(&channel->inbound); 1562d64e38aeSStephen Hemminger __napi_schedule(napi); 15637426b1a5Sstephen hemminger } 1564f4f1c23dSstephen hemminger 1565f4f1c23dSstephen hemminger /* Driver may overshoot since multiple packets per descriptor */ 1566f4f1c23dSstephen hemminger return min(work_done, budget); 156799a50bb1SK. Y. Srinivasan } 156899a50bb1SK. Y. Srinivasan 1569262b7f14Sstephen hemminger /* Call back when data is available in host ring buffer. 1570262b7f14Sstephen hemminger * Processing is deferred until network softirq (NAPI) 1571262b7f14Sstephen hemminger */ 15725b54dac8SHaiyang Zhang void netvsc_channel_cb(void *context) 157395fa0405SHaiyang Zhang { 15746de38af6Sstephen hemminger struct netvsc_channel *nvchan = context; 157543bf99ceSstephen hemminger struct vmbus_channel *channel = nvchan->channel; 157643bf99ceSstephen hemminger struct hv_ring_buffer_info *rbi = &channel->inbound; 157743bf99ceSstephen hemminger 157843bf99ceSstephen hemminger /* preload first vmpacket descriptor */ 157943bf99ceSstephen hemminger prefetch(hv_get_ring_buffer(rbi) + rbi->priv_read_index); 158095fa0405SHaiyang Zhang 1581f4f1c23dSstephen hemminger if (napi_schedule_prep(&nvchan->napi)) { 158252d3b494SAdrian Vladu /* disable interrupts from host */ 158343bf99ceSstephen hemminger hv_begin_read(rbi); 15840d6dd357Sstephen hemminger 158568633edaSStephen Hemminger __napi_schedule_irqoff(&nvchan->napi); 1586f4f1c23dSstephen hemminger } 158795fa0405SHaiyang Zhang } 158895fa0405SHaiyang Zhang 158995fa0405SHaiyang Zhang /* 159095fa0405SHaiyang Zhang * netvsc_device_add - Callback when the device belonging to this 159195fa0405SHaiyang Zhang * driver is added 159295fa0405SHaiyang Zhang */ 15939749fed5Sstephen hemminger struct netvsc_device *netvsc_device_add(struct hv_device *device, 15942c7f83caSstephen hemminger const struct netvsc_device_info *device_info) 159595fa0405SHaiyang Zhang { 159688098834SVitaly Kuznetsov int i, ret = 0; 159795fa0405SHaiyang Zhang struct netvsc_device *net_device; 159888098834SVitaly Kuznetsov struct net_device *ndev = hv_get_drvdata(device); 159988098834SVitaly Kuznetsov struct net_device_context *net_device_ctx = netdev_priv(ndev); 160095fa0405SHaiyang Zhang 160188098834SVitaly Kuznetsov net_device = alloc_net_device(); 1602b1c84927SDan Carpenter if (!net_device) 16039749fed5Sstephen hemminger return ERR_PTR(-ENOMEM); 160495fa0405SHaiyang Zhang 16056b0cbe31SHaiyang Zhang for (i = 0; i < VRSS_SEND_TAB_SIZE; i++) 16066b0cbe31SHaiyang Zhang net_device_ctx->tx_table[i] = 0; 16076b0cbe31SHaiyang Zhang 160815a863bfSstephen hemminger /* Because the device uses NAPI, all the interrupt batching and 160915a863bfSstephen hemminger * control is done via Net softirq, not the channel handling 161015a863bfSstephen hemminger */ 161115a863bfSstephen hemminger set_channel_read_mode(device->channel, HV_CALL_ISR); 161215a863bfSstephen hemminger 1613bffb1842SK. Y. Srinivasan /* If we're reopening the device we may have multiple queues, fill the 1614bffb1842SK. Y. Srinivasan * chn_table with the default channel to use it before subchannels are 1615bffb1842SK. Y. Srinivasan * opened. 1616bffb1842SK. Y. Srinivasan * Initialize the channel state before we open; 1617bffb1842SK. Y. Srinivasan * we can be interrupted as soon as we open the channel. 1618bffb1842SK. Y. Srinivasan */ 1619bffb1842SK. Y. Srinivasan 1620bffb1842SK. Y. Srinivasan for (i = 0; i < VRSS_CHANNEL_MAX; i++) { 1621bffb1842SK. Y. Srinivasan struct netvsc_channel *nvchan = &net_device->chan_table[i]; 1622bffb1842SK. Y. Srinivasan 1623bffb1842SK. Y. Srinivasan nvchan->channel = device->channel; 162435fbbccfSstephen hemminger nvchan->net_device = net_device; 16254a0dee1fSFlorian Fainelli u64_stats_init(&nvchan->tx_stats.syncp); 16264a0dee1fSFlorian Fainelli u64_stats_init(&nvchan->rx_stats.syncp); 1627351e1581SHaiyang Zhang 1628b02e5a0eSBjörn Töpel ret = xdp_rxq_info_reg(&nvchan->xdp_rxq, ndev, i, 0); 1629351e1581SHaiyang Zhang 1630351e1581SHaiyang Zhang if (ret) { 1631351e1581SHaiyang Zhang netdev_err(ndev, "xdp_rxq_info_reg fail: %d\n", ret); 1632351e1581SHaiyang Zhang goto cleanup2; 1633351e1581SHaiyang Zhang } 1634351e1581SHaiyang Zhang 1635351e1581SHaiyang Zhang ret = xdp_rxq_info_reg_mem_model(&nvchan->xdp_rxq, 1636351e1581SHaiyang Zhang MEM_TYPE_PAGE_SHARED, NULL); 1637351e1581SHaiyang Zhang 1638351e1581SHaiyang Zhang if (ret) { 1639351e1581SHaiyang Zhang netdev_err(ndev, "xdp reg_mem_model fail: %d\n", ret); 1640351e1581SHaiyang Zhang goto cleanup2; 1641351e1581SHaiyang Zhang } 1642bffb1842SK. Y. Srinivasan } 1643bffb1842SK. Y. Srinivasan 16442be0f264Sstephen hemminger /* Enable NAPI handler before init callbacks */ 16452be0f264Sstephen hemminger netif_napi_add(ndev, &net_device->chan_table[0].napi, 16462be0f264Sstephen hemminger netvsc_poll, NAPI_POLL_WEIGHT); 16472be0f264Sstephen hemminger 164895fa0405SHaiyang Zhang /* Open the channel */ 1649bf5fd8caSAndrea Parri (Microsoft) device->channel->next_request_id_callback = vmbus_next_request_id; 1650bf5fd8caSAndrea Parri (Microsoft) device->channel->request_addr_callback = vmbus_request_addr; 16514d18fcc9SAndres Beltran device->channel->rqstor_size = netvsc_rqstor_size(netvsc_ring_bytes); 1652adae1e93SAndres Beltran device->channel->max_pkt_size = NETVSC_MAX_PKT_SIZE; 1653adae1e93SAndres Beltran 1654a7f99d0fSStephen Hemminger ret = vmbus_open(device->channel, netvsc_ring_bytes, 1655a7f99d0fSStephen Hemminger netvsc_ring_bytes, NULL, 0, 1656a7f99d0fSStephen Hemminger netvsc_channel_cb, net_device->chan_table); 165795fa0405SHaiyang Zhang 165895fa0405SHaiyang Zhang if (ret != 0) { 165995fa0405SHaiyang Zhang netdev_err(ndev, "unable to open channel: %d\n", ret); 166095fa0405SHaiyang Zhang goto cleanup; 166195fa0405SHaiyang Zhang } 166295fa0405SHaiyang Zhang 166395fa0405SHaiyang Zhang /* Channel is opened */ 166493ba2222SVitaly Kuznetsov netdev_dbg(ndev, "hv_netvsc channel opened successfully\n"); 166595fa0405SHaiyang Zhang 166615a863bfSstephen hemminger napi_enable(&net_device->chan_table[0].napi); 166788098834SVitaly Kuznetsov 166895fa0405SHaiyang Zhang /* Connect with the NetVsp */ 16698b532797Sstephen hemminger ret = netvsc_connect_vsp(device, net_device, device_info); 167095fa0405SHaiyang Zhang if (ret != 0) { 167195fa0405SHaiyang Zhang netdev_err(ndev, 167295fa0405SHaiyang Zhang "unable to connect to NetVSP - %d\n", ret); 167395fa0405SHaiyang Zhang goto close; 167495fa0405SHaiyang Zhang } 167595fa0405SHaiyang Zhang 167612f69661SStephen Hemminger /* Writing nvdev pointer unlocks netvsc_send(), make sure chn_table is 167712f69661SStephen Hemminger * populated. 167812f69661SStephen Hemminger */ 167912f69661SStephen Hemminger rcu_assign_pointer(net_device_ctx->nvdev, net_device); 168012f69661SStephen Hemminger 16819749fed5Sstephen hemminger return net_device; 168295fa0405SHaiyang Zhang 168395fa0405SHaiyang Zhang close: 168449393347Sstephen hemminger RCU_INIT_POINTER(net_device_ctx->nvdev, NULL); 168549393347Sstephen hemminger napi_disable(&net_device->chan_table[0].napi); 168615a863bfSstephen hemminger 168795fa0405SHaiyang Zhang /* Now, we can close the channel safely */ 168895fa0405SHaiyang Zhang vmbus_close(device->channel); 168995fa0405SHaiyang Zhang 169095fa0405SHaiyang Zhang cleanup: 1691fcfb4a00SStephen Hemminger netif_napi_del(&net_device->chan_table[0].napi); 1692351e1581SHaiyang Zhang 1693351e1581SHaiyang Zhang cleanup2: 1694545a8e79Sstephen hemminger free_netvsc_device(&net_device->rcu); 169595fa0405SHaiyang Zhang 16969749fed5Sstephen hemminger return ERR_PTR(ret); 169795fa0405SHaiyang Zhang } 1698