195fa0405SHaiyang Zhang /* 295fa0405SHaiyang Zhang * Copyright (c) 2009, Microsoft Corporation. 395fa0405SHaiyang Zhang * 495fa0405SHaiyang Zhang * This program is free software; you can redistribute it and/or modify it 595fa0405SHaiyang Zhang * under the terms and conditions of the GNU General Public License, 695fa0405SHaiyang Zhang * version 2, as published by the Free Software Foundation. 795fa0405SHaiyang Zhang * 895fa0405SHaiyang Zhang * This program is distributed in the hope it will be useful, but WITHOUT 995fa0405SHaiyang Zhang * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1095fa0405SHaiyang Zhang * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 1195fa0405SHaiyang Zhang * more details. 1295fa0405SHaiyang Zhang * 1395fa0405SHaiyang Zhang * You should have received a copy of the GNU General Public License along with 14adf8d3ffSJeff Kirsher * this program; if not, see <http://www.gnu.org/licenses/>. 1595fa0405SHaiyang Zhang * 1695fa0405SHaiyang Zhang * Authors: 1795fa0405SHaiyang Zhang * Haiyang Zhang <haiyangz@microsoft.com> 1895fa0405SHaiyang Zhang * Hank Janssen <hjanssen@microsoft.com> 1995fa0405SHaiyang Zhang */ 2095fa0405SHaiyang Zhang #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 2195fa0405SHaiyang Zhang 2295fa0405SHaiyang Zhang #include <linux/kernel.h> 2395fa0405SHaiyang Zhang #include <linux/sched.h> 2495fa0405SHaiyang Zhang #include <linux/wait.h> 2595fa0405SHaiyang Zhang #include <linux/mm.h> 2695fa0405SHaiyang Zhang #include <linux/delay.h> 2795fa0405SHaiyang Zhang #include <linux/io.h> 2895fa0405SHaiyang Zhang #include <linux/slab.h> 2995fa0405SHaiyang Zhang #include <linux/netdevice.h> 30f157e78dSHaiyang Zhang #include <linux/if_ether.h> 31d6472302SStephen Rothwell #include <linux/vmalloc.h> 329749fed5Sstephen hemminger #include <linux/rtnetlink.h> 3343bf99ceSstephen hemminger #include <linux/prefetch.h> 349749fed5Sstephen hemminger 35c25aaf81SKY Srinivasan #include <asm/sync_bitops.h> 3695fa0405SHaiyang Zhang 3795fa0405SHaiyang Zhang #include "hyperv_net.h" 3895fa0405SHaiyang Zhang 3984bf9cefSKY Srinivasan /* 4084bf9cefSKY Srinivasan * Switch the data path from the synthetic interface to the VF 4184bf9cefSKY Srinivasan * interface. 4284bf9cefSKY Srinivasan */ 430a1275caSVitaly Kuznetsov void netvsc_switch_datapath(struct net_device *ndev, bool vf) 4484bf9cefSKY Srinivasan { 453d541ac5SVitaly Kuznetsov struct net_device_context *net_device_ctx = netdev_priv(ndev); 463d541ac5SVitaly Kuznetsov struct hv_device *dev = net_device_ctx->device_ctx; 4779e8cbe7Sstephen hemminger struct netvsc_device *nv_dev = rtnl_dereference(net_device_ctx->nvdev); 480a1275caSVitaly Kuznetsov struct nvsp_message *init_pkt = &nv_dev->channel_init_pkt; 4984bf9cefSKY Srinivasan 5084bf9cefSKY Srinivasan memset(init_pkt, 0, sizeof(struct nvsp_message)); 5184bf9cefSKY Srinivasan init_pkt->hdr.msg_type = NVSP_MSG4_TYPE_SWITCH_DATA_PATH; 5284bf9cefSKY Srinivasan if (vf) 5384bf9cefSKY Srinivasan init_pkt->msg.v4_msg.active_dp.active_datapath = 5484bf9cefSKY Srinivasan NVSP_DATAPATH_VF; 5584bf9cefSKY Srinivasan else 5684bf9cefSKY Srinivasan init_pkt->msg.v4_msg.active_dp.active_datapath = 5784bf9cefSKY Srinivasan NVSP_DATAPATH_SYNTHETIC; 5884bf9cefSKY Srinivasan 5984bf9cefSKY Srinivasan vmbus_sendpacket(dev->channel, init_pkt, 6084bf9cefSKY Srinivasan sizeof(struct nvsp_message), 6184bf9cefSKY Srinivasan (unsigned long)init_pkt, 6284bf9cefSKY Srinivasan VM_PKT_DATA_INBAND, 0); 6353fa1a6fSHaiyang Zhang 6453fa1a6fSHaiyang Zhang net_device_ctx->datapath = vf; 6584bf9cefSKY Srinivasan } 6684bf9cefSKY Srinivasan 6788098834SVitaly Kuznetsov static struct netvsc_device *alloc_net_device(void) 6895fa0405SHaiyang Zhang { 6995fa0405SHaiyang Zhang struct netvsc_device *net_device; 7095fa0405SHaiyang Zhang 7195fa0405SHaiyang Zhang net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL); 7295fa0405SHaiyang Zhang if (!net_device) 7395fa0405SHaiyang Zhang return NULL; 7495fa0405SHaiyang Zhang 75dc5cd894SHaiyang Zhang init_waitqueue_head(&net_device->wait_drain); 7695fa0405SHaiyang Zhang net_device->destroy = false; 7784bf9cefSKY Srinivasan atomic_set(&net_device->open_cnt, 0); 787c3877f2SHaiyang Zhang net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT; 797c3877f2SHaiyang Zhang net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT; 80fd612602SStephen Hemminger init_completion(&net_device->channel_init_wait); 817c3877f2SHaiyang Zhang 8295fa0405SHaiyang Zhang return net_device; 8395fa0405SHaiyang Zhang } 8495fa0405SHaiyang Zhang 85545a8e79Sstephen hemminger static void free_netvsc_device(struct rcu_head *head) 86f90251c8SHaiyang Zhang { 87545a8e79Sstephen hemminger struct netvsc_device *nvdev 88545a8e79Sstephen hemminger = container_of(head, struct netvsc_device, rcu); 89c0b558e5SHaiyang Zhang int i; 90c0b558e5SHaiyang Zhang 91c0b558e5SHaiyang Zhang for (i = 0; i < VRSS_CHANNEL_MAX; i++) 927426b1a5Sstephen hemminger vfree(nvdev->chan_table[i].mrc.slots); 93c0b558e5SHaiyang Zhang 94f90251c8SHaiyang Zhang kfree(nvdev); 95f90251c8SHaiyang Zhang } 96f90251c8SHaiyang Zhang 97545a8e79Sstephen hemminger static void free_netvsc_device_rcu(struct netvsc_device *nvdev) 98545a8e79Sstephen hemminger { 99545a8e79Sstephen hemminger call_rcu(&nvdev->rcu, free_netvsc_device); 100545a8e79Sstephen hemminger } 10146b4f7f5Sstephen hemminger 1027a2a0a84SStephen Hemminger static void netvsc_destroy_buf(struct hv_device *device) 10395fa0405SHaiyang Zhang { 10495fa0405SHaiyang Zhang struct nvsp_message *revoke_packet; 1053d541ac5SVitaly Kuznetsov struct net_device *ndev = hv_get_drvdata(device); 1063962981fSstephen hemminger struct net_device_context *ndc = netdev_priv(ndev); 1073962981fSstephen hemminger struct netvsc_device *net_device = rtnl_dereference(ndc->nvdev); 1087a2a0a84SStephen Hemminger int ret; 10995fa0405SHaiyang Zhang 11095fa0405SHaiyang Zhang /* 11195fa0405SHaiyang Zhang * If we got a section count, it means we received a 11295fa0405SHaiyang Zhang * SendReceiveBufferComplete msg (ie sent 11395fa0405SHaiyang Zhang * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need 11495fa0405SHaiyang Zhang * to send a revoke msg here 11595fa0405SHaiyang Zhang */ 11695fa0405SHaiyang Zhang if (net_device->recv_section_cnt) { 11795fa0405SHaiyang Zhang /* Send the revoke receive buffer */ 11895fa0405SHaiyang Zhang revoke_packet = &net_device->revoke_packet; 11995fa0405SHaiyang Zhang memset(revoke_packet, 0, sizeof(struct nvsp_message)); 12095fa0405SHaiyang Zhang 12195fa0405SHaiyang Zhang revoke_packet->hdr.msg_type = 12295fa0405SHaiyang Zhang NVSP_MSG1_TYPE_REVOKE_RECV_BUF; 12395fa0405SHaiyang Zhang revoke_packet->msg.v1_msg. 12495fa0405SHaiyang Zhang revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; 12595fa0405SHaiyang Zhang 1263d541ac5SVitaly Kuznetsov ret = vmbus_sendpacket(device->channel, 12795fa0405SHaiyang Zhang revoke_packet, 12895fa0405SHaiyang Zhang sizeof(struct nvsp_message), 12995fa0405SHaiyang Zhang (unsigned long)revoke_packet, 13095fa0405SHaiyang Zhang VM_PKT_DATA_INBAND, 0); 13173e64fa4SK. Y. Srinivasan /* If the failure is because the channel is rescinded; 13273e64fa4SK. Y. Srinivasan * ignore the failure since we cannot send on a rescinded 13373e64fa4SK. Y. Srinivasan * channel. This would allow us to properly cleanup 13473e64fa4SK. Y. Srinivasan * even when the channel is rescinded. 13573e64fa4SK. Y. Srinivasan */ 13673e64fa4SK. Y. Srinivasan if (device->channel->rescind) 13773e64fa4SK. Y. Srinivasan ret = 0; 13895fa0405SHaiyang Zhang /* 13995fa0405SHaiyang Zhang * If we failed here, we might as well return and 14095fa0405SHaiyang Zhang * have a leak rather than continue and a bugchk 14195fa0405SHaiyang Zhang */ 14295fa0405SHaiyang Zhang if (ret != 0) { 14395fa0405SHaiyang Zhang netdev_err(ndev, "unable to send " 14495fa0405SHaiyang Zhang "revoke receive buffer to netvsp\n"); 1457a2a0a84SStephen Hemminger return; 14695fa0405SHaiyang Zhang } 14795fa0405SHaiyang Zhang } 14895fa0405SHaiyang Zhang 14995fa0405SHaiyang Zhang /* Teardown the gpadl on the vsp end */ 15095fa0405SHaiyang Zhang if (net_device->recv_buf_gpadl_handle) { 1513d541ac5SVitaly Kuznetsov ret = vmbus_teardown_gpadl(device->channel, 15295fa0405SHaiyang Zhang net_device->recv_buf_gpadl_handle); 15395fa0405SHaiyang Zhang 15495fa0405SHaiyang Zhang /* If we failed here, we might as well return and have a leak 15595fa0405SHaiyang Zhang * rather than continue and a bugchk 15695fa0405SHaiyang Zhang */ 15795fa0405SHaiyang Zhang if (ret != 0) { 15895fa0405SHaiyang Zhang netdev_err(ndev, 15995fa0405SHaiyang Zhang "unable to teardown receive buffer's gpadl\n"); 1607a2a0a84SStephen Hemminger return; 16195fa0405SHaiyang Zhang } 16295fa0405SHaiyang Zhang net_device->recv_buf_gpadl_handle = 0; 16395fa0405SHaiyang Zhang } 16495fa0405SHaiyang Zhang 16595fa0405SHaiyang Zhang if (net_device->recv_buf) { 16695fa0405SHaiyang Zhang /* Free up the receive buffer */ 167b679ef73SHaiyang Zhang vfree(net_device->recv_buf); 16895fa0405SHaiyang Zhang net_device->recv_buf = NULL; 16995fa0405SHaiyang Zhang } 17095fa0405SHaiyang Zhang 171c25aaf81SKY Srinivasan /* Deal with the send buffer we may have setup. 172c25aaf81SKY Srinivasan * If we got a send section size, it means we received a 173c51ed182SHaiyang Zhang * NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE msg (ie sent 174c51ed182SHaiyang Zhang * NVSP_MSG1_TYPE_SEND_SEND_BUF msg) therefore, we need 175c25aaf81SKY Srinivasan * to send a revoke msg here 176c25aaf81SKY Srinivasan */ 177c25aaf81SKY Srinivasan if (net_device->send_section_size) { 178c25aaf81SKY Srinivasan /* Send the revoke receive buffer */ 179c25aaf81SKY Srinivasan revoke_packet = &net_device->revoke_packet; 180c25aaf81SKY Srinivasan memset(revoke_packet, 0, sizeof(struct nvsp_message)); 181c25aaf81SKY Srinivasan 182c25aaf81SKY Srinivasan revoke_packet->hdr.msg_type = 183c25aaf81SKY Srinivasan NVSP_MSG1_TYPE_REVOKE_SEND_BUF; 184c51ed182SHaiyang Zhang revoke_packet->msg.v1_msg.revoke_send_buf.id = 185c51ed182SHaiyang Zhang NETVSC_SEND_BUFFER_ID; 186c25aaf81SKY Srinivasan 1873d541ac5SVitaly Kuznetsov ret = vmbus_sendpacket(device->channel, 188c25aaf81SKY Srinivasan revoke_packet, 189c25aaf81SKY Srinivasan sizeof(struct nvsp_message), 190c25aaf81SKY Srinivasan (unsigned long)revoke_packet, 191c25aaf81SKY Srinivasan VM_PKT_DATA_INBAND, 0); 19273e64fa4SK. Y. Srinivasan 19373e64fa4SK. Y. Srinivasan /* If the failure is because the channel is rescinded; 19473e64fa4SK. Y. Srinivasan * ignore the failure since we cannot send on a rescinded 19573e64fa4SK. Y. Srinivasan * channel. This would allow us to properly cleanup 19673e64fa4SK. Y. Srinivasan * even when the channel is rescinded. 19773e64fa4SK. Y. Srinivasan */ 19873e64fa4SK. Y. Srinivasan if (device->channel->rescind) 19973e64fa4SK. Y. Srinivasan ret = 0; 20073e64fa4SK. Y. Srinivasan 201c25aaf81SKY Srinivasan /* If we failed here, we might as well return and 202c25aaf81SKY Srinivasan * have a leak rather than continue and a bugchk 203c25aaf81SKY Srinivasan */ 204c25aaf81SKY Srinivasan if (ret != 0) { 205c25aaf81SKY Srinivasan netdev_err(ndev, "unable to send " 206c25aaf81SKY Srinivasan "revoke send buffer to netvsp\n"); 2077a2a0a84SStephen Hemminger return; 208c25aaf81SKY Srinivasan } 209c25aaf81SKY Srinivasan } 210c25aaf81SKY Srinivasan /* Teardown the gpadl on the vsp end */ 211c25aaf81SKY Srinivasan if (net_device->send_buf_gpadl_handle) { 2123d541ac5SVitaly Kuznetsov ret = vmbus_teardown_gpadl(device->channel, 213c25aaf81SKY Srinivasan net_device->send_buf_gpadl_handle); 214c25aaf81SKY Srinivasan 215c25aaf81SKY Srinivasan /* If we failed here, we might as well return and have a leak 216c25aaf81SKY Srinivasan * rather than continue and a bugchk 217c25aaf81SKY Srinivasan */ 218c25aaf81SKY Srinivasan if (ret != 0) { 219c25aaf81SKY Srinivasan netdev_err(ndev, 220c25aaf81SKY Srinivasan "unable to teardown send buffer's gpadl\n"); 2217a2a0a84SStephen Hemminger return; 222c25aaf81SKY Srinivasan } 2232f18423dSDave Jones net_device->send_buf_gpadl_handle = 0; 224c25aaf81SKY Srinivasan } 225c25aaf81SKY Srinivasan if (net_device->send_buf) { 226c51ed182SHaiyang Zhang /* Free up the send buffer */ 22706b47aacSKY Srinivasan vfree(net_device->send_buf); 228c25aaf81SKY Srinivasan net_device->send_buf = NULL; 229c25aaf81SKY Srinivasan } 230c25aaf81SKY Srinivasan kfree(net_device->send_section_map); 23195fa0405SHaiyang Zhang } 23295fa0405SHaiyang Zhang 2337426b1a5Sstephen hemminger int netvsc_alloc_recv_comp_ring(struct netvsc_device *net_device, u32 q_idx) 2347426b1a5Sstephen hemminger { 2357426b1a5Sstephen hemminger struct netvsc_channel *nvchan = &net_device->chan_table[q_idx]; 2367426b1a5Sstephen hemminger int node = cpu_to_node(nvchan->channel->target_cpu); 2377426b1a5Sstephen hemminger size_t size; 2387426b1a5Sstephen hemminger 2397426b1a5Sstephen hemminger size = net_device->recv_completion_cnt * sizeof(struct recv_comp_data); 2407426b1a5Sstephen hemminger nvchan->mrc.slots = vzalloc_node(size, node); 2417426b1a5Sstephen hemminger if (!nvchan->mrc.slots) 2427426b1a5Sstephen hemminger nvchan->mrc.slots = vzalloc(size); 2437426b1a5Sstephen hemminger 2447426b1a5Sstephen hemminger return nvchan->mrc.slots ? 0 : -ENOMEM; 2457426b1a5Sstephen hemminger } 2467426b1a5Sstephen hemminger 24795790837Sstephen hemminger static int netvsc_init_buf(struct hv_device *device, 24895790837Sstephen hemminger struct netvsc_device *net_device) 24995fa0405SHaiyang Zhang { 25095fa0405SHaiyang Zhang int ret = 0; 25195fa0405SHaiyang Zhang struct nvsp_message *init_packet; 2527426b1a5Sstephen hemminger struct nvsp_1_message_send_receive_buffer_complete *resp; 25395fa0405SHaiyang Zhang struct net_device *ndev; 254fdfb70d2Sstephen hemminger size_t map_words; 2550a726c2bSK. Y. Srinivasan int node; 25695fa0405SHaiyang Zhang 2570a1275caSVitaly Kuznetsov ndev = hv_get_drvdata(device); 25895fa0405SHaiyang Zhang 2590a726c2bSK. Y. Srinivasan node = cpu_to_node(device->channel->target_cpu); 2600a726c2bSK. Y. Srinivasan net_device->recv_buf = vzalloc_node(net_device->recv_buf_size, node); 2610a726c2bSK. Y. Srinivasan if (!net_device->recv_buf) 262b679ef73SHaiyang Zhang net_device->recv_buf = vzalloc(net_device->recv_buf_size); 2630a726c2bSK. Y. Srinivasan 26495fa0405SHaiyang Zhang if (!net_device->recv_buf) { 26595fa0405SHaiyang Zhang netdev_err(ndev, "unable to allocate receive " 26695fa0405SHaiyang Zhang "buffer of size %d\n", net_device->recv_buf_size); 26795fa0405SHaiyang Zhang ret = -ENOMEM; 26895fa0405SHaiyang Zhang goto cleanup; 26995fa0405SHaiyang Zhang } 27095fa0405SHaiyang Zhang 27195fa0405SHaiyang Zhang /* 27295fa0405SHaiyang Zhang * Establish the gpadl handle for this buffer on this 27395fa0405SHaiyang Zhang * channel. Note: This call uses the vmbus connection rather 27495fa0405SHaiyang Zhang * than the channel to establish the gpadl handle. 27595fa0405SHaiyang Zhang */ 27695fa0405SHaiyang Zhang ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf, 27795fa0405SHaiyang Zhang net_device->recv_buf_size, 27895fa0405SHaiyang Zhang &net_device->recv_buf_gpadl_handle); 27995fa0405SHaiyang Zhang if (ret != 0) { 28095fa0405SHaiyang Zhang netdev_err(ndev, 28195fa0405SHaiyang Zhang "unable to establish receive buffer's gpadl\n"); 28295fa0405SHaiyang Zhang goto cleanup; 28395fa0405SHaiyang Zhang } 28495fa0405SHaiyang Zhang 28595fa0405SHaiyang Zhang /* Notify the NetVsp of the gpadl handle */ 28695fa0405SHaiyang Zhang init_packet = &net_device->channel_init_pkt; 28795fa0405SHaiyang Zhang memset(init_packet, 0, sizeof(struct nvsp_message)); 28895fa0405SHaiyang Zhang init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF; 28995fa0405SHaiyang Zhang init_packet->msg.v1_msg.send_recv_buf. 29095fa0405SHaiyang Zhang gpadl_handle = net_device->recv_buf_gpadl_handle; 29195fa0405SHaiyang Zhang init_packet->msg.v1_msg. 29295fa0405SHaiyang Zhang send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; 29395fa0405SHaiyang Zhang 29495fa0405SHaiyang Zhang /* Send the gpadl notification request */ 29595fa0405SHaiyang Zhang ret = vmbus_sendpacket(device->channel, init_packet, 29695fa0405SHaiyang Zhang sizeof(struct nvsp_message), 29795fa0405SHaiyang Zhang (unsigned long)init_packet, 29895fa0405SHaiyang Zhang VM_PKT_DATA_INBAND, 29995fa0405SHaiyang Zhang VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 30095fa0405SHaiyang Zhang if (ret != 0) { 30195fa0405SHaiyang Zhang netdev_err(ndev, 30295fa0405SHaiyang Zhang "unable to send receive buffer's gpadl to netvsp\n"); 30395fa0405SHaiyang Zhang goto cleanup; 30495fa0405SHaiyang Zhang } 30595fa0405SHaiyang Zhang 3065362855aSVitaly Kuznetsov wait_for_completion(&net_device->channel_init_wait); 30795fa0405SHaiyang Zhang 30895fa0405SHaiyang Zhang /* Check the response */ 3097426b1a5Sstephen hemminger resp = &init_packet->msg.v1_msg.send_recv_buf_complete; 3107426b1a5Sstephen hemminger if (resp->status != NVSP_STAT_SUCCESS) { 3117426b1a5Sstephen hemminger netdev_err(ndev, 3127426b1a5Sstephen hemminger "Unable to complete receive buffer initialization with NetVsp - status %d\n", 3137426b1a5Sstephen hemminger resp->status); 31495fa0405SHaiyang Zhang ret = -EINVAL; 31595fa0405SHaiyang Zhang goto cleanup; 31695fa0405SHaiyang Zhang } 31795fa0405SHaiyang Zhang 31895fa0405SHaiyang Zhang /* Parse the response */ 3197426b1a5Sstephen hemminger netdev_dbg(ndev, "Receive sections: %u sub_allocs: size %u count: %u\n", 3207426b1a5Sstephen hemminger resp->num_sections, resp->sections[0].sub_alloc_size, 3217426b1a5Sstephen hemminger resp->sections[0].num_sub_allocs); 32295fa0405SHaiyang Zhang 3237426b1a5Sstephen hemminger net_device->recv_section_cnt = resp->num_sections; 32495fa0405SHaiyang Zhang 32595fa0405SHaiyang Zhang /* 32695fa0405SHaiyang Zhang * For 1st release, there should only be 1 section that represents the 32795fa0405SHaiyang Zhang * entire receive buffer 32895fa0405SHaiyang Zhang */ 32995fa0405SHaiyang Zhang if (net_device->recv_section_cnt != 1 || 3307426b1a5Sstephen hemminger resp->sections[0].offset != 0) { 33195fa0405SHaiyang Zhang ret = -EINVAL; 33295fa0405SHaiyang Zhang goto cleanup; 33395fa0405SHaiyang Zhang } 33495fa0405SHaiyang Zhang 3357426b1a5Sstephen hemminger /* Setup receive completion ring */ 3367426b1a5Sstephen hemminger net_device->recv_completion_cnt 3377426b1a5Sstephen hemminger = round_up(resp->sections[0].num_sub_allocs + 1, 3387426b1a5Sstephen hemminger PAGE_SIZE / sizeof(u64)); 3397426b1a5Sstephen hemminger ret = netvsc_alloc_recv_comp_ring(net_device, 0); 3407426b1a5Sstephen hemminger if (ret) 3417426b1a5Sstephen hemminger goto cleanup; 3427426b1a5Sstephen hemminger 3437426b1a5Sstephen hemminger /* Now setup the send buffer. */ 3445defde59SK. Y. Srinivasan net_device->send_buf = vzalloc_node(net_device->send_buf_size, node); 3455defde59SK. Y. Srinivasan if (!net_device->send_buf) 34606b47aacSKY Srinivasan net_device->send_buf = vzalloc(net_device->send_buf_size); 347c25aaf81SKY Srinivasan if (!net_device->send_buf) { 348c25aaf81SKY Srinivasan netdev_err(ndev, "unable to allocate send " 349c25aaf81SKY Srinivasan "buffer of size %d\n", net_device->send_buf_size); 350c25aaf81SKY Srinivasan ret = -ENOMEM; 351c25aaf81SKY Srinivasan goto cleanup; 352c25aaf81SKY Srinivasan } 353c25aaf81SKY Srinivasan 354c25aaf81SKY Srinivasan /* Establish the gpadl handle for this buffer on this 355c25aaf81SKY Srinivasan * channel. Note: This call uses the vmbus connection rather 356c25aaf81SKY Srinivasan * than the channel to establish the gpadl handle. 357c25aaf81SKY Srinivasan */ 358c25aaf81SKY Srinivasan ret = vmbus_establish_gpadl(device->channel, net_device->send_buf, 359c25aaf81SKY Srinivasan net_device->send_buf_size, 360c25aaf81SKY Srinivasan &net_device->send_buf_gpadl_handle); 361c25aaf81SKY Srinivasan if (ret != 0) { 362c25aaf81SKY Srinivasan netdev_err(ndev, 363c25aaf81SKY Srinivasan "unable to establish send buffer's gpadl\n"); 364c25aaf81SKY Srinivasan goto cleanup; 365c25aaf81SKY Srinivasan } 366c25aaf81SKY Srinivasan 367c25aaf81SKY Srinivasan /* Notify the NetVsp of the gpadl handle */ 368c25aaf81SKY Srinivasan init_packet = &net_device->channel_init_pkt; 369c25aaf81SKY Srinivasan memset(init_packet, 0, sizeof(struct nvsp_message)); 370c25aaf81SKY Srinivasan init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF; 371c51ed182SHaiyang Zhang init_packet->msg.v1_msg.send_send_buf.gpadl_handle = 372c25aaf81SKY Srinivasan net_device->send_buf_gpadl_handle; 373c51ed182SHaiyang Zhang init_packet->msg.v1_msg.send_send_buf.id = NETVSC_SEND_BUFFER_ID; 374c25aaf81SKY Srinivasan 375c25aaf81SKY Srinivasan /* Send the gpadl notification request */ 376c25aaf81SKY Srinivasan ret = vmbus_sendpacket(device->channel, init_packet, 377c25aaf81SKY Srinivasan sizeof(struct nvsp_message), 378c25aaf81SKY Srinivasan (unsigned long)init_packet, 379c25aaf81SKY Srinivasan VM_PKT_DATA_INBAND, 380c25aaf81SKY Srinivasan VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 381c25aaf81SKY Srinivasan if (ret != 0) { 382c25aaf81SKY Srinivasan netdev_err(ndev, 383c25aaf81SKY Srinivasan "unable to send send buffer's gpadl to netvsp\n"); 384c25aaf81SKY Srinivasan goto cleanup; 385c25aaf81SKY Srinivasan } 386c25aaf81SKY Srinivasan 3875362855aSVitaly Kuznetsov wait_for_completion(&net_device->channel_init_wait); 388c25aaf81SKY Srinivasan 389c25aaf81SKY Srinivasan /* Check the response */ 390c25aaf81SKY Srinivasan if (init_packet->msg.v1_msg. 391c25aaf81SKY Srinivasan send_send_buf_complete.status != NVSP_STAT_SUCCESS) { 392c25aaf81SKY Srinivasan netdev_err(ndev, "Unable to complete send buffer " 393c25aaf81SKY Srinivasan "initialization with NetVsp - status %d\n", 394c25aaf81SKY Srinivasan init_packet->msg.v1_msg. 395c51ed182SHaiyang Zhang send_send_buf_complete.status); 396c25aaf81SKY Srinivasan ret = -EINVAL; 397c25aaf81SKY Srinivasan goto cleanup; 398c25aaf81SKY Srinivasan } 399c25aaf81SKY Srinivasan 400c25aaf81SKY Srinivasan /* Parse the response */ 401c25aaf81SKY Srinivasan net_device->send_section_size = init_packet->msg. 402c25aaf81SKY Srinivasan v1_msg.send_send_buf_complete.section_size; 403c25aaf81SKY Srinivasan 404c25aaf81SKY Srinivasan /* Section count is simply the size divided by the section size. 405c25aaf81SKY Srinivasan */ 406c25aaf81SKY Srinivasan net_device->send_section_cnt = 407c25aaf81SKY Srinivasan net_device->send_buf_size / net_device->send_section_size; 408c25aaf81SKY Srinivasan 40993ba2222SVitaly Kuznetsov netdev_dbg(ndev, "Send section size: %d, Section count:%d\n", 410c25aaf81SKY Srinivasan net_device->send_section_size, net_device->send_section_cnt); 411c25aaf81SKY Srinivasan 412c25aaf81SKY Srinivasan /* Setup state for managing the send buffer. */ 413fdfb70d2Sstephen hemminger map_words = DIV_ROUND_UP(net_device->send_section_cnt, BITS_PER_LONG); 414c25aaf81SKY Srinivasan 415fdfb70d2Sstephen hemminger net_device->send_section_map = kcalloc(map_words, sizeof(ulong), GFP_KERNEL); 416dd1d3f8fSWei Yongjun if (net_device->send_section_map == NULL) { 417dd1d3f8fSWei Yongjun ret = -ENOMEM; 418c25aaf81SKY Srinivasan goto cleanup; 419dd1d3f8fSWei Yongjun } 420c25aaf81SKY Srinivasan 42195fa0405SHaiyang Zhang goto exit; 42295fa0405SHaiyang Zhang 42395fa0405SHaiyang Zhang cleanup: 4243d541ac5SVitaly Kuznetsov netvsc_destroy_buf(device); 42595fa0405SHaiyang Zhang 42695fa0405SHaiyang Zhang exit: 42795fa0405SHaiyang Zhang return ret; 42895fa0405SHaiyang Zhang } 42995fa0405SHaiyang Zhang 430f157e78dSHaiyang Zhang /* Negotiate NVSP protocol version */ 431f157e78dSHaiyang Zhang static int negotiate_nvsp_ver(struct hv_device *device, 432f157e78dSHaiyang Zhang struct netvsc_device *net_device, 433f157e78dSHaiyang Zhang struct nvsp_message *init_packet, 434f157e78dSHaiyang Zhang u32 nvsp_ver) 43595fa0405SHaiyang Zhang { 4360a1275caSVitaly Kuznetsov struct net_device *ndev = hv_get_drvdata(device); 4377390fe9cSNicholas Mc Guire int ret; 438f157e78dSHaiyang Zhang 439f157e78dSHaiyang Zhang memset(init_packet, 0, sizeof(struct nvsp_message)); 440f157e78dSHaiyang Zhang init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT; 441f157e78dSHaiyang Zhang init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver; 442f157e78dSHaiyang Zhang init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver; 443f157e78dSHaiyang Zhang 444f157e78dSHaiyang Zhang /* Send the init request */ 445f157e78dSHaiyang Zhang ret = vmbus_sendpacket(device->channel, init_packet, 446f157e78dSHaiyang Zhang sizeof(struct nvsp_message), 447f157e78dSHaiyang Zhang (unsigned long)init_packet, 448f157e78dSHaiyang Zhang VM_PKT_DATA_INBAND, 449f157e78dSHaiyang Zhang VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 450f157e78dSHaiyang Zhang 451f157e78dSHaiyang Zhang if (ret != 0) 452f157e78dSHaiyang Zhang return ret; 453f157e78dSHaiyang Zhang 4545362855aSVitaly Kuznetsov wait_for_completion(&net_device->channel_init_wait); 455f157e78dSHaiyang Zhang 456f157e78dSHaiyang Zhang if (init_packet->msg.init_msg.init_complete.status != 457f157e78dSHaiyang Zhang NVSP_STAT_SUCCESS) 458f157e78dSHaiyang Zhang return -EINVAL; 459f157e78dSHaiyang Zhang 460a1eabb01SHaiyang Zhang if (nvsp_ver == NVSP_PROTOCOL_VERSION_1) 461f157e78dSHaiyang Zhang return 0; 462f157e78dSHaiyang Zhang 46371790a27SHaiyang Zhang /* NVSPv2 or later: Send NDIS config */ 464f157e78dSHaiyang Zhang memset(init_packet, 0, sizeof(struct nvsp_message)); 465f157e78dSHaiyang Zhang init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG; 4660a1275caSVitaly Kuznetsov init_packet->msg.v2_msg.send_ndis_config.mtu = ndev->mtu + ETH_HLEN; 4671f5f3a75SHaiyang Zhang init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1; 468f157e78dSHaiyang Zhang 4697f5d5af0SHaiyang Zhang if (nvsp_ver >= NVSP_PROTOCOL_VERSION_5) { 47071790a27SHaiyang Zhang init_packet->msg.v2_msg.send_ndis_config.capability.sriov = 1; 47171790a27SHaiyang Zhang 4727f5d5af0SHaiyang Zhang /* Teaming bit is needed to receive link speed updates */ 4737f5d5af0SHaiyang Zhang init_packet->msg.v2_msg.send_ndis_config.capability.teaming = 1; 4747f5d5af0SHaiyang Zhang } 4757f5d5af0SHaiyang Zhang 476f157e78dSHaiyang Zhang ret = vmbus_sendpacket(device->channel, init_packet, 477f157e78dSHaiyang Zhang sizeof(struct nvsp_message), 478f157e78dSHaiyang Zhang (unsigned long)init_packet, 479f157e78dSHaiyang Zhang VM_PKT_DATA_INBAND, 0); 480f157e78dSHaiyang Zhang 481f157e78dSHaiyang Zhang return ret; 482f157e78dSHaiyang Zhang } 483f157e78dSHaiyang Zhang 48495790837Sstephen hemminger static int netvsc_connect_vsp(struct hv_device *device, 48595790837Sstephen hemminger struct netvsc_device *net_device) 486f157e78dSHaiyang Zhang { 487e5a78fadSStephen Hemminger const u32 ver_list[] = { 488e5a78fadSStephen Hemminger NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2, 48995790837Sstephen hemminger NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5 49095790837Sstephen hemminger }; 49195790837Sstephen hemminger struct nvsp_message *init_packet; 49295790837Sstephen hemminger int ndis_version, i, ret; 49395fa0405SHaiyang Zhang 49495fa0405SHaiyang Zhang init_packet = &net_device->channel_init_pkt; 49595fa0405SHaiyang Zhang 496f157e78dSHaiyang Zhang /* Negotiate the latest NVSP protocol supported */ 497e5a78fadSStephen Hemminger for (i = ARRAY_SIZE(ver_list) - 1; i >= 0; i--) 498f157e78dSHaiyang Zhang if (negotiate_nvsp_ver(device, net_device, init_packet, 499a1eabb01SHaiyang Zhang ver_list[i]) == 0) { 500a1eabb01SHaiyang Zhang net_device->nvsp_version = ver_list[i]; 501a1eabb01SHaiyang Zhang break; 502a1eabb01SHaiyang Zhang } 503a1eabb01SHaiyang Zhang 504a1eabb01SHaiyang Zhang if (i < 0) { 50595fa0405SHaiyang Zhang ret = -EPROTO; 50695fa0405SHaiyang Zhang goto cleanup; 50795fa0405SHaiyang Zhang } 508f157e78dSHaiyang Zhang 509f157e78dSHaiyang Zhang pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version); 510f157e78dSHaiyang Zhang 51195fa0405SHaiyang Zhang /* Send the ndis version */ 51295fa0405SHaiyang Zhang memset(init_packet, 0, sizeof(struct nvsp_message)); 51395fa0405SHaiyang Zhang 514a1eabb01SHaiyang Zhang if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4) 5151f73db49SKY Srinivasan ndis_version = 0x00060001; 516a1eabb01SHaiyang Zhang else 517a1eabb01SHaiyang Zhang ndis_version = 0x0006001e; 51895fa0405SHaiyang Zhang 51995fa0405SHaiyang Zhang init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER; 52095fa0405SHaiyang Zhang init_packet->msg.v1_msg. 52195fa0405SHaiyang Zhang send_ndis_ver.ndis_major_ver = 52295fa0405SHaiyang Zhang (ndis_version & 0xFFFF0000) >> 16; 52395fa0405SHaiyang Zhang init_packet->msg.v1_msg. 52495fa0405SHaiyang Zhang send_ndis_ver.ndis_minor_ver = 52595fa0405SHaiyang Zhang ndis_version & 0xFFFF; 52695fa0405SHaiyang Zhang 52795fa0405SHaiyang Zhang /* Send the init request */ 52895fa0405SHaiyang Zhang ret = vmbus_sendpacket(device->channel, init_packet, 52995fa0405SHaiyang Zhang sizeof(struct nvsp_message), 53095fa0405SHaiyang Zhang (unsigned long)init_packet, 53195fa0405SHaiyang Zhang VM_PKT_DATA_INBAND, 0); 53295fa0405SHaiyang Zhang if (ret != 0) 53395fa0405SHaiyang Zhang goto cleanup; 53495fa0405SHaiyang Zhang 53595fa0405SHaiyang Zhang /* Post the big receive buffer to NetVSP */ 53699d3016dSHaiyang Zhang if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2) 53799d3016dSHaiyang Zhang net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY; 53899d3016dSHaiyang Zhang else 53999d3016dSHaiyang Zhang net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE; 540c25aaf81SKY Srinivasan net_device->send_buf_size = NETVSC_SEND_BUFFER_SIZE; 54199d3016dSHaiyang Zhang 54295790837Sstephen hemminger ret = netvsc_init_buf(device, net_device); 54395fa0405SHaiyang Zhang 54495fa0405SHaiyang Zhang cleanup: 54595fa0405SHaiyang Zhang return ret; 54695fa0405SHaiyang Zhang } 54795fa0405SHaiyang Zhang 5483d541ac5SVitaly Kuznetsov static void netvsc_disconnect_vsp(struct hv_device *device) 54995fa0405SHaiyang Zhang { 5503d541ac5SVitaly Kuznetsov netvsc_destroy_buf(device); 55195fa0405SHaiyang Zhang } 55295fa0405SHaiyang Zhang 55395fa0405SHaiyang Zhang /* 55495fa0405SHaiyang Zhang * netvsc_device_remove - Callback when the root bus device is removed 55595fa0405SHaiyang Zhang */ 556e08f3ea5SStephen Hemminger void netvsc_device_remove(struct hv_device *device) 55795fa0405SHaiyang Zhang { 5583d541ac5SVitaly Kuznetsov struct net_device *ndev = hv_get_drvdata(device); 5593d541ac5SVitaly Kuznetsov struct net_device_context *net_device_ctx = netdev_priv(ndev); 56079e8cbe7Sstephen hemminger struct netvsc_device *net_device 56179e8cbe7Sstephen hemminger = rtnl_dereference(net_device_ctx->nvdev); 56215a863bfSstephen hemminger int i; 56395fa0405SHaiyang Zhang 5643d541ac5SVitaly Kuznetsov netvsc_disconnect_vsp(device); 56595fa0405SHaiyang Zhang 566545a8e79Sstephen hemminger RCU_INIT_POINTER(net_device_ctx->nvdev, NULL); 56795fa0405SHaiyang Zhang 56895fa0405SHaiyang Zhang /* 56995fa0405SHaiyang Zhang * At this point, no one should be accessing net_device 57095fa0405SHaiyang Zhang * except in here 57195fa0405SHaiyang Zhang */ 57293ba2222SVitaly Kuznetsov netdev_dbg(ndev, "net device safe to remove\n"); 57395fa0405SHaiyang Zhang 57495fa0405SHaiyang Zhang /* Now, we can close the channel safely */ 57595fa0405SHaiyang Zhang vmbus_close(device->channel); 57695fa0405SHaiyang Zhang 57776bb5db5Sstephen hemminger /* And dissassociate NAPI context from device */ 57879cd874cSstephen hemminger for (i = 0; i < net_device->num_chn; i++) 57976bb5db5Sstephen hemminger netif_napi_del(&net_device->chan_table[i].napi); 58015a863bfSstephen hemminger 58195fa0405SHaiyang Zhang /* Release all resources */ 582545a8e79Sstephen hemminger free_netvsc_device_rcu(net_device); 58395fa0405SHaiyang Zhang } 58495fa0405SHaiyang Zhang 58533be96e4SHaiyang Zhang #define RING_AVAIL_PERCENT_HIWATER 20 58633be96e4SHaiyang Zhang #define RING_AVAIL_PERCENT_LOWATER 10 58733be96e4SHaiyang Zhang 58833be96e4SHaiyang Zhang /* 58933be96e4SHaiyang Zhang * Get the percentage of available bytes to write in the ring. 59033be96e4SHaiyang Zhang * The return value is in range from 0 to 100. 59133be96e4SHaiyang Zhang */ 59233be96e4SHaiyang Zhang static inline u32 hv_ringbuf_avail_percent( 59333be96e4SHaiyang Zhang struct hv_ring_buffer_info *ring_info) 59433be96e4SHaiyang Zhang { 59533be96e4SHaiyang Zhang u32 avail_read, avail_write; 59633be96e4SHaiyang Zhang 59733be96e4SHaiyang Zhang hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write); 59833be96e4SHaiyang Zhang 59933be96e4SHaiyang Zhang return avail_write * 100 / ring_info->ring_datasize; 60033be96e4SHaiyang Zhang } 60133be96e4SHaiyang Zhang 602c25aaf81SKY Srinivasan static inline void netvsc_free_send_slot(struct netvsc_device *net_device, 603c25aaf81SKY Srinivasan u32 index) 604c25aaf81SKY Srinivasan { 605c25aaf81SKY Srinivasan sync_change_bit(index, net_device->send_section_map); 606c25aaf81SKY Srinivasan } 607c25aaf81SKY Srinivasan 608bc304dd3SStephen Hemminger static void netvsc_send_tx_complete(struct netvsc_device *net_device, 60925b85ee8SKY Srinivasan struct vmbus_channel *incoming_channel, 61097c1723aSKY Srinivasan struct hv_device *device, 611f9645430Sstephen hemminger const struct vmpacket_descriptor *desc, 612f9645430Sstephen hemminger int budget) 61395fa0405SHaiyang Zhang { 61450698d80Sstephen hemminger struct sk_buff *skb = (struct sk_buff *)(unsigned long)desc->trans_id; 6153d541ac5SVitaly Kuznetsov struct net_device *ndev = hv_get_drvdata(device); 616bc304dd3SStephen Hemminger struct vmbus_channel *channel = device->channel; 6175b54dac8SHaiyang Zhang u16 q_idx = 0; 6185b54dac8SHaiyang Zhang int queue_sends; 61933be96e4SHaiyang Zhang 62095fa0405SHaiyang Zhang /* Notify the layer above us */ 621bc304dd3SStephen Hemminger if (likely(skb)) { 622793e3955Sstephen hemminger const struct hv_netvsc_packet *packet 623bc304dd3SStephen Hemminger = (struct hv_netvsc_packet *)skb->cb; 624793e3955Sstephen hemminger u32 send_index = packet->send_buf_index; 625793e3955Sstephen hemminger struct netvsc_stats *tx_stats; 626bc304dd3SStephen Hemminger 627c25aaf81SKY Srinivasan if (send_index != NETVSC_INVALID_INDEX) 628c25aaf81SKY Srinivasan netvsc_free_send_slot(net_device, send_index); 629793e3955Sstephen hemminger q_idx = packet->q_idx; 63025b85ee8SKY Srinivasan channel = incoming_channel; 631bc304dd3SStephen Hemminger 6326c80f3fcSSimon Xiao tx_stats = &net_device->chan_table[q_idx].tx_stats; 633793e3955Sstephen hemminger 634793e3955Sstephen hemminger u64_stats_update_begin(&tx_stats->syncp); 635793e3955Sstephen hemminger tx_stats->packets += packet->total_packets; 636793e3955Sstephen hemminger tx_stats->bytes += packet->total_bytes; 637793e3955Sstephen hemminger u64_stats_update_end(&tx_stats->syncp); 638793e3955Sstephen hemminger 639f9645430Sstephen hemminger napi_consume_skb(skb, budget); 6405b54dac8SHaiyang Zhang } 64195fa0405SHaiyang Zhang 642b8b835a8Sstephen hemminger queue_sends = 643b8b835a8Sstephen hemminger atomic_dec_return(&net_device->chan_table[q_idx].queue_sends); 6441d06825bSHaiyang Zhang 64546b4f7f5Sstephen hemminger if (net_device->destroy && queue_sends == 0) 646dc5cd894SHaiyang Zhang wake_up(&net_device->wait_drain); 647dc5cd894SHaiyang Zhang 6485b54dac8SHaiyang Zhang if (netif_tx_queue_stopped(netdev_get_tx_queue(ndev, q_idx)) && 649bc304dd3SStephen Hemminger (hv_ringbuf_avail_percent(&channel->outbound) > RING_AVAIL_PERCENT_HIWATER || 650bc304dd3SStephen Hemminger queue_sends < 1)) 651796cc88cSStephen Hemminger netif_tx_wake_queue(netdev_get_tx_queue(ndev, q_idx)); 652bc304dd3SStephen Hemminger } 653bc304dd3SStephen Hemminger 654bc304dd3SStephen Hemminger static void netvsc_send_completion(struct netvsc_device *net_device, 655bc304dd3SStephen Hemminger struct vmbus_channel *incoming_channel, 656bc304dd3SStephen Hemminger struct hv_device *device, 657f9645430Sstephen hemminger const struct vmpacket_descriptor *desc, 658f9645430Sstephen hemminger int budget) 659bc304dd3SStephen Hemminger { 660f3dd3f47Sstephen hemminger struct nvsp_message *nvsp_packet = hv_pkt_data(desc); 661bc304dd3SStephen Hemminger struct net_device *ndev = hv_get_drvdata(device); 662bc304dd3SStephen Hemminger 663bc304dd3SStephen Hemminger switch (nvsp_packet->hdr.msg_type) { 664bc304dd3SStephen Hemminger case NVSP_MSG_TYPE_INIT_COMPLETE: 665bc304dd3SStephen Hemminger case NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE: 666bc304dd3SStephen Hemminger case NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE: 667bc304dd3SStephen Hemminger case NVSP_MSG5_TYPE_SUBCHANNEL: 668bc304dd3SStephen Hemminger /* Copy the response back */ 669bc304dd3SStephen Hemminger memcpy(&net_device->channel_init_pkt, nvsp_packet, 670bc304dd3SStephen Hemminger sizeof(struct nvsp_message)); 671bc304dd3SStephen Hemminger complete(&net_device->channel_init_wait); 672bc304dd3SStephen Hemminger break; 673bc304dd3SStephen Hemminger 674bc304dd3SStephen Hemminger case NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE: 675bc304dd3SStephen Hemminger netvsc_send_tx_complete(net_device, incoming_channel, 676f9645430Sstephen hemminger device, desc, budget); 677bc304dd3SStephen Hemminger break; 678bc304dd3SStephen Hemminger 679bc304dd3SStephen Hemminger default: 680bc304dd3SStephen Hemminger netdev_err(ndev, 681bc304dd3SStephen Hemminger "Unknown send completion type %d received!!\n", 682bc304dd3SStephen Hemminger nvsp_packet->hdr.msg_type); 68395fa0405SHaiyang Zhang } 68495fa0405SHaiyang Zhang } 68595fa0405SHaiyang Zhang 686c25aaf81SKY Srinivasan static u32 netvsc_get_next_send_section(struct netvsc_device *net_device) 687c25aaf81SKY Srinivasan { 688b58a1858Sstephen hemminger unsigned long *map_addr = net_device->send_section_map; 689b58a1858Sstephen hemminger unsigned int i; 690c25aaf81SKY Srinivasan 691fdfb70d2Sstephen hemminger for_each_clear_bit(i, map_addr, net_device->send_section_cnt) { 692b58a1858Sstephen hemminger if (sync_test_and_set_bit(i, map_addr) == 0) 693b58a1858Sstephen hemminger return i; 694c25aaf81SKY Srinivasan } 695b58a1858Sstephen hemminger 696b58a1858Sstephen hemminger return NETVSC_INVALID_INDEX; 697c25aaf81SKY Srinivasan } 698c25aaf81SKY Srinivasan 699da19fcd0SLad, Prabhakar static u32 netvsc_copy_to_send_buf(struct netvsc_device *net_device, 700c25aaf81SKY Srinivasan unsigned int section_index, 7017c3877f2SHaiyang Zhang u32 pend_size, 70224476760SKY Srinivasan struct hv_netvsc_packet *packet, 703a9f2e2d6SKY Srinivasan struct rndis_message *rndis_msg, 70402b6de01Sstephen hemminger struct hv_page_buffer *pb, 705694a9fb0SKY Srinivasan struct sk_buff *skb) 706c25aaf81SKY Srinivasan { 707c25aaf81SKY Srinivasan char *start = net_device->send_buf; 7087c3877f2SHaiyang Zhang char *dest = start + (section_index * net_device->send_section_size) 7097c3877f2SHaiyang Zhang + pend_size; 710c25aaf81SKY Srinivasan int i; 711c25aaf81SKY Srinivasan u32 msg_size = 0; 7127c3877f2SHaiyang Zhang u32 padding = 0; 7137c3877f2SHaiyang Zhang u32 remain = packet->total_data_buflen % net_device->pkt_align; 714aa0a34beSHaiyang Zhang u32 page_count = packet->cp_partial ? packet->rmsg_pgcnt : 715aa0a34beSHaiyang Zhang packet->page_buf_cnt; 7167c3877f2SHaiyang Zhang 7177c3877f2SHaiyang Zhang /* Add padding */ 718ebc1dcf6Sstephen hemminger if (skb->xmit_more && remain && !packet->cp_partial) { 7197c3877f2SHaiyang Zhang padding = net_device->pkt_align - remain; 72024476760SKY Srinivasan rndis_msg->msg_len += padding; 7217c3877f2SHaiyang Zhang packet->total_data_buflen += padding; 7227c3877f2SHaiyang Zhang } 723c25aaf81SKY Srinivasan 724aa0a34beSHaiyang Zhang for (i = 0; i < page_count; i++) { 72502b6de01Sstephen hemminger char *src = phys_to_virt(pb[i].pfn << PAGE_SHIFT); 72602b6de01Sstephen hemminger u32 offset = pb[i].offset; 72702b6de01Sstephen hemminger u32 len = pb[i].len; 728c25aaf81SKY Srinivasan 729c25aaf81SKY Srinivasan memcpy(dest, (src + offset), len); 730c25aaf81SKY Srinivasan msg_size += len; 731c25aaf81SKY Srinivasan dest += len; 732c25aaf81SKY Srinivasan } 7337c3877f2SHaiyang Zhang 7347c3877f2SHaiyang Zhang if (padding) { 7357c3877f2SHaiyang Zhang memset(dest, 0, padding); 7367c3877f2SHaiyang Zhang msg_size += padding; 7377c3877f2SHaiyang Zhang } 7387c3877f2SHaiyang Zhang 739c25aaf81SKY Srinivasan return msg_size; 740c25aaf81SKY Srinivasan } 741c25aaf81SKY Srinivasan 7423a8963acSStephen Hemminger static inline int netvsc_send_pkt( 7430a1275caSVitaly Kuznetsov struct hv_device *device, 7447c3877f2SHaiyang Zhang struct hv_netvsc_packet *packet, 745a9f2e2d6SKY Srinivasan struct netvsc_device *net_device, 74602b6de01Sstephen hemminger struct hv_page_buffer *pb, 7473a3d9a0aSKY Srinivasan struct sk_buff *skb) 74895fa0405SHaiyang Zhang { 7497c3877f2SHaiyang Zhang struct nvsp_message nvmsg; 750b8b835a8Sstephen hemminger struct netvsc_channel *nvchan 751b8b835a8Sstephen hemminger = &net_device->chan_table[packet->q_idx]; 752b8b835a8Sstephen hemminger struct vmbus_channel *out_channel = nvchan->channel; 7530a1275caSVitaly Kuznetsov struct net_device *ndev = hv_get_drvdata(device); 754b8b835a8Sstephen hemminger struct netdev_queue *txq = netdev_get_tx_queue(ndev, packet->q_idx); 7557c3877f2SHaiyang Zhang u64 req_id; 7567c3877f2SHaiyang Zhang int ret; 75782fa3c77SKY Srinivasan u32 ring_avail = hv_ringbuf_avail_percent(&out_channel->outbound); 758c25aaf81SKY Srinivasan 7597c3877f2SHaiyang Zhang nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT; 760694a9fb0SKY Srinivasan if (skb != NULL) { 76195fa0405SHaiyang Zhang /* 0 is RMC_DATA; */ 7627c3877f2SHaiyang Zhang nvmsg.msg.v1_msg.send_rndis_pkt.channel_type = 0; 76395fa0405SHaiyang Zhang } else { 76495fa0405SHaiyang Zhang /* 1 is RMC_CONTROL; */ 7657c3877f2SHaiyang Zhang nvmsg.msg.v1_msg.send_rndis_pkt.channel_type = 1; 76695fa0405SHaiyang Zhang } 76795fa0405SHaiyang Zhang 7687c3877f2SHaiyang Zhang nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_index = 7697c3877f2SHaiyang Zhang packet->send_buf_index; 7707c3877f2SHaiyang Zhang if (packet->send_buf_index == NETVSC_INVALID_INDEX) 7717c3877f2SHaiyang Zhang nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0; 7727c3877f2SHaiyang Zhang else 7737c3877f2SHaiyang Zhang nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 7747c3877f2SHaiyang Zhang packet->total_data_buflen; 77595fa0405SHaiyang Zhang 7763a3d9a0aSKY Srinivasan req_id = (ulong)skb; 777f1ea3cd7SHaiyang Zhang 778c3582a2cSHaiyang Zhang if (out_channel->rescind) 779c3582a2cSHaiyang Zhang return -ENODEV; 780c3582a2cSHaiyang Zhang 78195fa0405SHaiyang Zhang if (packet->page_buf_cnt) { 78202b6de01Sstephen hemminger if (packet->cp_partial) 78302b6de01Sstephen hemminger pb += packet->rmsg_pgcnt; 78402b6de01Sstephen hemminger 78582fa3c77SKY Srinivasan ret = vmbus_sendpacket_pagebuffer_ctl(out_channel, 78602b6de01Sstephen hemminger pb, packet->page_buf_cnt, 7877c3877f2SHaiyang Zhang &nvmsg, 78895fa0405SHaiyang Zhang sizeof(struct nvsp_message), 78982fa3c77SKY Srinivasan req_id, 7903454323cSStephen Hemminger VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 79195fa0405SHaiyang Zhang } else { 79282fa3c77SKY Srinivasan ret = vmbus_sendpacket_ctl(out_channel, &nvmsg, 79395fa0405SHaiyang Zhang sizeof(struct nvsp_message), 794f1ea3cd7SHaiyang Zhang req_id, 79595fa0405SHaiyang Zhang VM_PKT_DATA_INBAND, 7963454323cSStephen Hemminger VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 79795fa0405SHaiyang Zhang } 79895fa0405SHaiyang Zhang 7991d06825bSHaiyang Zhang if (ret == 0) { 800b8b835a8Sstephen hemminger atomic_inc_return(&nvchan->queue_sends); 8015b54dac8SHaiyang Zhang 80246b4f7f5Sstephen hemminger if (ring_avail < RING_AVAIL_PERCENT_LOWATER) 803b8b835a8Sstephen hemminger netif_tx_stop_queue(txq); 8041d06825bSHaiyang Zhang } else if (ret == -EAGAIN) { 805b8b835a8Sstephen hemminger netif_tx_stop_queue(txq); 806b8b835a8Sstephen hemminger if (atomic_read(&nvchan->queue_sends) < 1) { 807b8b835a8Sstephen hemminger netif_tx_wake_queue(txq); 80833be96e4SHaiyang Zhang ret = -ENOSPC; 80933be96e4SHaiyang Zhang } 8101d06825bSHaiyang Zhang } else { 8114a2176c6Sstephen hemminger netdev_err(ndev, 8124a2176c6Sstephen hemminger "Unable to send packet pages %u len %u, ret %d\n", 8134a2176c6Sstephen hemminger packet->page_buf_cnt, packet->total_data_buflen, 8144a2176c6Sstephen hemminger ret); 8151d06825bSHaiyang Zhang } 81695fa0405SHaiyang Zhang 8177c3877f2SHaiyang Zhang return ret; 8187c3877f2SHaiyang Zhang } 8197c3877f2SHaiyang Zhang 820c85e4924SHaiyang Zhang /* Move packet out of multi send data (msd), and clear msd */ 821c85e4924SHaiyang Zhang static inline void move_pkt_msd(struct hv_netvsc_packet **msd_send, 822c85e4924SHaiyang Zhang struct sk_buff **msd_skb, 823c85e4924SHaiyang Zhang struct multi_send_data *msdp) 824c85e4924SHaiyang Zhang { 825c85e4924SHaiyang Zhang *msd_skb = msdp->skb; 826c85e4924SHaiyang Zhang *msd_send = msdp->pkt; 827c85e4924SHaiyang Zhang msdp->skb = NULL; 828c85e4924SHaiyang Zhang msdp->pkt = NULL; 829c85e4924SHaiyang Zhang msdp->count = 0; 830c85e4924SHaiyang Zhang } 831c85e4924SHaiyang Zhang 8322a926f79Sstephen hemminger /* RCU already held by caller */ 8332a926f79Sstephen hemminger int netvsc_send(struct net_device_context *ndev_ctx, 83424476760SKY Srinivasan struct hv_netvsc_packet *packet, 835a9f2e2d6SKY Srinivasan struct rndis_message *rndis_msg, 83602b6de01Sstephen hemminger struct hv_page_buffer *pb, 8373a3d9a0aSKY Srinivasan struct sk_buff *skb) 8387c3877f2SHaiyang Zhang { 8393962981fSstephen hemminger struct netvsc_device *net_device 840867047c4Sstephen hemminger = rcu_dereference_bh(ndev_ctx->nvdev); 8412a926f79Sstephen hemminger struct hv_device *device = ndev_ctx->device_ctx; 8426c4c137eSStephen Hemminger int ret = 0; 843b8b835a8Sstephen hemminger struct netvsc_channel *nvchan; 8447c3877f2SHaiyang Zhang u32 pktlen = packet->total_data_buflen, msd_len = 0; 8457c3877f2SHaiyang Zhang unsigned int section_index = NETVSC_INVALID_INDEX; 8467c3877f2SHaiyang Zhang struct multi_send_data *msdp; 8477c3877f2SHaiyang Zhang struct hv_netvsc_packet *msd_send = NULL, *cur_send = NULL; 848c85e4924SHaiyang Zhang struct sk_buff *msd_skb = NULL; 849aa0a34beSHaiyang Zhang bool try_batch; 850bde79be5SKY Srinivasan bool xmit_more = (skb != NULL) ? skb->xmit_more : false; 8517c3877f2SHaiyang Zhang 852592b4fe8Sstephen hemminger /* If device is rescinded, return error and packet will get dropped. */ 8532a926f79Sstephen hemminger if (unlikely(!net_device || net_device->destroy)) 8547c3877f2SHaiyang Zhang return -ENODEV; 8557c3877f2SHaiyang Zhang 856e8f0a89cSVitaly Kuznetsov /* We may race with netvsc_connect_vsp()/netvsc_init_buf() and get 857e8f0a89cSVitaly Kuznetsov * here before the negotiation with the host is finished and 858e8f0a89cSVitaly Kuznetsov * send_section_map may not be allocated yet. 859e8f0a89cSVitaly Kuznetsov */ 8602d694d2aSstephen hemminger if (unlikely(!net_device->send_section_map)) 861e8f0a89cSVitaly Kuznetsov return -EAGAIN; 862e8f0a89cSVitaly Kuznetsov 863b8b835a8Sstephen hemminger nvchan = &net_device->chan_table[packet->q_idx]; 8647c3877f2SHaiyang Zhang packet->send_buf_index = NETVSC_INVALID_INDEX; 865aa0a34beSHaiyang Zhang packet->cp_partial = false; 8667c3877f2SHaiyang Zhang 867cf8190e4SHaiyang Zhang /* Send control message directly without accessing msd (Multi-Send 868cf8190e4SHaiyang Zhang * Data) field which may be changed during data packet processing. 869cf8190e4SHaiyang Zhang */ 870cf8190e4SHaiyang Zhang if (!skb) { 871cf8190e4SHaiyang Zhang cur_send = packet; 872cf8190e4SHaiyang Zhang goto send_now; 873cf8190e4SHaiyang Zhang } 874cf8190e4SHaiyang Zhang 8757c3877f2SHaiyang Zhang /* batch packets in send buffer if possible */ 876b8b835a8Sstephen hemminger msdp = &nvchan->msd; 8777c3877f2SHaiyang Zhang if (msdp->pkt) 8787c3877f2SHaiyang Zhang msd_len = msdp->pkt->total_data_buflen; 8797c3877f2SHaiyang Zhang 880ebc1dcf6Sstephen hemminger try_batch = msd_len > 0 && msdp->count < net_device->max_pkt; 881aa0a34beSHaiyang Zhang if (try_batch && msd_len + pktlen + net_device->pkt_align < 8827c3877f2SHaiyang Zhang net_device->send_section_size) { 8837c3877f2SHaiyang Zhang section_index = msdp->pkt->send_buf_index; 8847c3877f2SHaiyang Zhang 885aa0a34beSHaiyang Zhang } else if (try_batch && msd_len + packet->rmsg_size < 886aa0a34beSHaiyang Zhang net_device->send_section_size) { 887aa0a34beSHaiyang Zhang section_index = msdp->pkt->send_buf_index; 888aa0a34beSHaiyang Zhang packet->cp_partial = true; 889aa0a34beSHaiyang Zhang 890ebc1dcf6Sstephen hemminger } else if (pktlen + net_device->pkt_align < 8917c3877f2SHaiyang Zhang net_device->send_section_size) { 8927c3877f2SHaiyang Zhang section_index = netvsc_get_next_send_section(net_device); 8937c3877f2SHaiyang Zhang if (section_index != NETVSC_INVALID_INDEX) { 894c85e4924SHaiyang Zhang move_pkt_msd(&msd_send, &msd_skb, msdp); 8957c3877f2SHaiyang Zhang msd_len = 0; 8967c3877f2SHaiyang Zhang } 8977c3877f2SHaiyang Zhang } 8987c3877f2SHaiyang Zhang 8997c3877f2SHaiyang Zhang if (section_index != NETVSC_INVALID_INDEX) { 9007c3877f2SHaiyang Zhang netvsc_copy_to_send_buf(net_device, 9017c3877f2SHaiyang Zhang section_index, msd_len, 902694a9fb0SKY Srinivasan packet, rndis_msg, pb, skb); 903b08cc791SKY Srinivasan 904aa0a34beSHaiyang Zhang packet->send_buf_index = section_index; 905aa0a34beSHaiyang Zhang 906aa0a34beSHaiyang Zhang if (packet->cp_partial) { 907aa0a34beSHaiyang Zhang packet->page_buf_cnt -= packet->rmsg_pgcnt; 908aa0a34beSHaiyang Zhang packet->total_data_buflen = msd_len + packet->rmsg_size; 909aa0a34beSHaiyang Zhang } else { 910aa0a34beSHaiyang Zhang packet->page_buf_cnt = 0; 911aa0a34beSHaiyang Zhang packet->total_data_buflen += msd_len; 912aa0a34beSHaiyang Zhang } 9137c3877f2SHaiyang Zhang 914793e3955Sstephen hemminger if (msdp->pkt) { 915793e3955Sstephen hemminger packet->total_packets += msdp->pkt->total_packets; 916793e3955Sstephen hemminger packet->total_bytes += msdp->pkt->total_bytes; 917793e3955Sstephen hemminger } 918793e3955Sstephen hemminger 919c85e4924SHaiyang Zhang if (msdp->skb) 92017db4bceSStephen Hemminger dev_consume_skb_any(msdp->skb); 921ee90b812SHaiyang Zhang 922bde79be5SKY Srinivasan if (xmit_more && !packet->cp_partial) { 923c85e4924SHaiyang Zhang msdp->skb = skb; 9247c3877f2SHaiyang Zhang msdp->pkt = packet; 9257c3877f2SHaiyang Zhang msdp->count++; 9267c3877f2SHaiyang Zhang } else { 9277c3877f2SHaiyang Zhang cur_send = packet; 928c85e4924SHaiyang Zhang msdp->skb = NULL; 9297c3877f2SHaiyang Zhang msdp->pkt = NULL; 9307c3877f2SHaiyang Zhang msdp->count = 0; 9317c3877f2SHaiyang Zhang } 9327c3877f2SHaiyang Zhang } else { 933c85e4924SHaiyang Zhang move_pkt_msd(&msd_send, &msd_skb, msdp); 9347c3877f2SHaiyang Zhang cur_send = packet; 9357c3877f2SHaiyang Zhang } 9367c3877f2SHaiyang Zhang 9377c3877f2SHaiyang Zhang if (msd_send) { 9386c4c137eSStephen Hemminger int m_ret = netvsc_send_pkt(device, msd_send, net_device, 9390a1275caSVitaly Kuznetsov NULL, msd_skb); 9407c3877f2SHaiyang Zhang 9417c3877f2SHaiyang Zhang if (m_ret != 0) { 9427c3877f2SHaiyang Zhang netvsc_free_send_slot(net_device, 9437c3877f2SHaiyang Zhang msd_send->send_buf_index); 944c85e4924SHaiyang Zhang dev_kfree_skb_any(msd_skb); 9457c3877f2SHaiyang Zhang } 9467c3877f2SHaiyang Zhang } 9477c3877f2SHaiyang Zhang 948cf8190e4SHaiyang Zhang send_now: 9497c3877f2SHaiyang Zhang if (cur_send) 9500a1275caSVitaly Kuznetsov ret = netvsc_send_pkt(device, cur_send, net_device, pb, skb); 9517c3877f2SHaiyang Zhang 9527aab5159SJerry Snitselaar if (ret != 0 && section_index != NETVSC_INVALID_INDEX) 953d953ca4dSHaiyang Zhang netvsc_free_send_slot(net_device, section_index); 954d953ca4dSHaiyang Zhang 95595fa0405SHaiyang Zhang return ret; 95695fa0405SHaiyang Zhang } 95795fa0405SHaiyang Zhang 9587426b1a5Sstephen hemminger /* Send pending recv completions */ 9597426b1a5Sstephen hemminger static int send_recv_completions(struct netvsc_channel *nvchan) 96095fa0405SHaiyang Zhang { 9617426b1a5Sstephen hemminger struct netvsc_device *nvdev = nvchan->net_device; 9627426b1a5Sstephen hemminger struct multi_recv_comp *mrc = &nvchan->mrc; 9637426b1a5Sstephen hemminger struct recv_comp_msg { 9647426b1a5Sstephen hemminger struct nvsp_message_header hdr; 9657426b1a5Sstephen hemminger u32 status; 9667426b1a5Sstephen hemminger } __packed; 9677426b1a5Sstephen hemminger struct recv_comp_msg msg = { 9687426b1a5Sstephen hemminger .hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE, 9697426b1a5Sstephen hemminger }; 97095fa0405SHaiyang Zhang int ret; 97195fa0405SHaiyang Zhang 9727426b1a5Sstephen hemminger while (mrc->first != mrc->next) { 9737426b1a5Sstephen hemminger const struct recv_comp_data *rcd 9747426b1a5Sstephen hemminger = mrc->slots + mrc->first; 97595fa0405SHaiyang Zhang 9767426b1a5Sstephen hemminger msg.status = rcd->status; 9777426b1a5Sstephen hemminger ret = vmbus_sendpacket(nvchan->channel, &msg, sizeof(msg), 9787426b1a5Sstephen hemminger rcd->tid, VM_PKT_COMP, 0); 9797426b1a5Sstephen hemminger if (unlikely(ret)) 980c0b558e5SHaiyang Zhang return ret; 9817426b1a5Sstephen hemminger 9827426b1a5Sstephen hemminger if (++mrc->first == nvdev->recv_completion_cnt) 9837426b1a5Sstephen hemminger mrc->first = 0; 98495fa0405SHaiyang Zhang } 985c0b558e5SHaiyang Zhang 9867426b1a5Sstephen hemminger /* receive completion ring has been emptied */ 9877426b1a5Sstephen hemminger if (unlikely(nvdev->destroy)) 9887426b1a5Sstephen hemminger wake_up(&nvdev->wait_drain); 9897426b1a5Sstephen hemminger 9907426b1a5Sstephen hemminger return 0; 9917426b1a5Sstephen hemminger } 9927426b1a5Sstephen hemminger 9937426b1a5Sstephen hemminger /* Count how many receive completions are outstanding */ 9947426b1a5Sstephen hemminger static void recv_comp_slot_avail(const struct netvsc_device *nvdev, 9957426b1a5Sstephen hemminger const struct multi_recv_comp *mrc, 996c0b558e5SHaiyang Zhang u32 *filled, u32 *avail) 997c0b558e5SHaiyang Zhang { 9987426b1a5Sstephen hemminger u32 count = nvdev->recv_completion_cnt; 999c0b558e5SHaiyang Zhang 10007426b1a5Sstephen hemminger if (mrc->next >= mrc->first) 10017426b1a5Sstephen hemminger *filled = mrc->next - mrc->first; 10027426b1a5Sstephen hemminger else 10037426b1a5Sstephen hemminger *filled = (count - mrc->first) + mrc->next; 1004c0b558e5SHaiyang Zhang 10057426b1a5Sstephen hemminger *avail = count - *filled - 1; 100695fa0405SHaiyang Zhang } 1007c0b558e5SHaiyang Zhang 10087426b1a5Sstephen hemminger /* Add receive complete to ring to send to host. */ 10097426b1a5Sstephen hemminger static void enq_receive_complete(struct net_device *ndev, 10107426b1a5Sstephen hemminger struct netvsc_device *nvdev, u16 q_idx, 10117426b1a5Sstephen hemminger u64 tid, u32 status) 1012c0b558e5SHaiyang Zhang { 10137426b1a5Sstephen hemminger struct netvsc_channel *nvchan = &nvdev->chan_table[q_idx]; 10147426b1a5Sstephen hemminger struct multi_recv_comp *mrc = &nvchan->mrc; 10157426b1a5Sstephen hemminger struct recv_comp_data *rcd; 1016c0b558e5SHaiyang Zhang u32 filled, avail; 1017c0b558e5SHaiyang Zhang 10187426b1a5Sstephen hemminger recv_comp_slot_avail(nvdev, mrc, &filled, &avail); 1019c0b558e5SHaiyang Zhang 10207426b1a5Sstephen hemminger if (unlikely(filled > NAPI_POLL_WEIGHT)) { 10217426b1a5Sstephen hemminger send_recv_completions(nvchan); 10227426b1a5Sstephen hemminger recv_comp_slot_avail(nvdev, mrc, &filled, &avail); 1023c0b558e5SHaiyang Zhang } 1024c0b558e5SHaiyang Zhang 10257426b1a5Sstephen hemminger if (unlikely(!avail)) { 10267426b1a5Sstephen hemminger netdev_err(ndev, "Recv_comp full buf q:%hd, tid:%llx\n", 10277426b1a5Sstephen hemminger q_idx, tid); 10287426b1a5Sstephen hemminger return; 1029c0b558e5SHaiyang Zhang } 1030c0b558e5SHaiyang Zhang 10317426b1a5Sstephen hemminger rcd = mrc->slots + mrc->next; 10327426b1a5Sstephen hemminger rcd->tid = tid; 10337426b1a5Sstephen hemminger rcd->status = status; 1034c0b558e5SHaiyang Zhang 10357426b1a5Sstephen hemminger if (++mrc->next == nvdev->recv_completion_cnt) 10367426b1a5Sstephen hemminger mrc->next = 0; 103795fa0405SHaiyang Zhang } 103895fa0405SHaiyang Zhang 103915a863bfSstephen hemminger static int netvsc_receive(struct net_device *ndev, 1040dc54a08cSstephen hemminger struct netvsc_device *net_device, 1041dc54a08cSstephen hemminger struct net_device_context *net_device_ctx, 104297c1723aSKY Srinivasan struct hv_device *device, 1043dc54a08cSstephen hemminger struct vmbus_channel *channel, 1044f3dd3f47Sstephen hemminger const struct vmpacket_descriptor *desc, 1045dc54a08cSstephen hemminger struct nvsp_message *nvsp) 104695fa0405SHaiyang Zhang { 1047f3dd3f47Sstephen hemminger const struct vmtransfer_page_packet_header *vmxferpage_packet 1048f3dd3f47Sstephen hemminger = container_of(desc, const struct vmtransfer_page_packet_header, d); 104915a863bfSstephen hemminger u16 q_idx = channel->offermsg.offer.sub_channel_index; 1050dc54a08cSstephen hemminger char *recv_buf = net_device->recv_buf; 10514baab261SHaiyang Zhang u32 status = NVSP_STAT_SUCCESS; 105245326342SHaiyang Zhang int i; 105345326342SHaiyang Zhang int count = 0; 105495fa0405SHaiyang Zhang 105595fa0405SHaiyang Zhang /* Make sure this is a valid nvsp packet */ 1056dc54a08cSstephen hemminger if (unlikely(nvsp->hdr.msg_type != NVSP_MSG1_TYPE_SEND_RNDIS_PKT)) { 1057dc54a08cSstephen hemminger netif_err(net_device_ctx, rx_err, ndev, 1058dc54a08cSstephen hemminger "Unknown nvsp packet type received %u\n", 1059dc54a08cSstephen hemminger nvsp->hdr.msg_type); 106015a863bfSstephen hemminger return 0; 106195fa0405SHaiyang Zhang } 106295fa0405SHaiyang Zhang 1063dc54a08cSstephen hemminger if (unlikely(vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID)) { 1064dc54a08cSstephen hemminger netif_err(net_device_ctx, rx_err, ndev, 1065dc54a08cSstephen hemminger "Invalid xfer page set id - expecting %x got %x\n", 1066dc54a08cSstephen hemminger NETVSC_RECEIVE_BUFFER_ID, 106795fa0405SHaiyang Zhang vmxferpage_packet->xfer_pageset_id); 106815a863bfSstephen hemminger return 0; 106995fa0405SHaiyang Zhang } 107095fa0405SHaiyang Zhang 10714baab261SHaiyang Zhang count = vmxferpage_packet->range_cnt; 107295fa0405SHaiyang Zhang 107395fa0405SHaiyang Zhang /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */ 10744baab261SHaiyang Zhang for (i = 0; i < count; i++) { 1075dc54a08cSstephen hemminger void *data = recv_buf 1076dc54a08cSstephen hemminger + vmxferpage_packet->ranges[i].byte_offset; 1077dc54a08cSstephen hemminger u32 buflen = vmxferpage_packet->ranges[i].byte_count; 107895fa0405SHaiyang Zhang 107995fa0405SHaiyang Zhang /* Pass it to the upper layer */ 1080dc54a08cSstephen hemminger status = rndis_filter_receive(ndev, net_device, device, 1081dc54a08cSstephen hemminger channel, data, buflen); 108295fa0405SHaiyang Zhang } 108395fa0405SHaiyang Zhang 10847426b1a5Sstephen hemminger enq_receive_complete(ndev, net_device, q_idx, 10857426b1a5Sstephen hemminger vmxferpage_packet->d.trans_id, status); 108615a863bfSstephen hemminger 108715a863bfSstephen hemminger return count; 108895fa0405SHaiyang Zhang } 108995fa0405SHaiyang Zhang 10905b54dac8SHaiyang Zhang static void netvsc_send_table(struct hv_device *hdev, 109171790a27SHaiyang Zhang struct nvsp_message *nvmsg) 10925b54dac8SHaiyang Zhang { 10930a1275caSVitaly Kuznetsov struct net_device *ndev = hv_get_drvdata(hdev); 10947ce10124Sstephen hemminger struct net_device_context *net_device_ctx = netdev_priv(ndev); 10955b54dac8SHaiyang Zhang int i; 10965b54dac8SHaiyang Zhang u32 count, *tab; 10975b54dac8SHaiyang Zhang 10985b54dac8SHaiyang Zhang count = nvmsg->msg.v5_msg.send_table.count; 10995b54dac8SHaiyang Zhang if (count != VRSS_SEND_TAB_SIZE) { 11005b54dac8SHaiyang Zhang netdev_err(ndev, "Received wrong send-table size:%u\n", count); 11015b54dac8SHaiyang Zhang return; 11025b54dac8SHaiyang Zhang } 11035b54dac8SHaiyang Zhang 11045b54dac8SHaiyang Zhang tab = (u32 *)((unsigned long)&nvmsg->msg.v5_msg.send_table + 11055b54dac8SHaiyang Zhang nvmsg->msg.v5_msg.send_table.offset); 11065b54dac8SHaiyang Zhang 11075b54dac8SHaiyang Zhang for (i = 0; i < count; i++) 11087ce10124Sstephen hemminger net_device_ctx->tx_send_table[i] = tab[i]; 11095b54dac8SHaiyang Zhang } 11105b54dac8SHaiyang Zhang 1111f9a7da91SVitaly Kuznetsov static void netvsc_send_vf(struct net_device_context *net_device_ctx, 111271790a27SHaiyang Zhang struct nvsp_message *nvmsg) 111371790a27SHaiyang Zhang { 1114f9a7da91SVitaly Kuznetsov net_device_ctx->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated; 1115f9a7da91SVitaly Kuznetsov net_device_ctx->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial; 111671790a27SHaiyang Zhang } 111771790a27SHaiyang Zhang 111871790a27SHaiyang Zhang static inline void netvsc_receive_inband(struct hv_device *hdev, 1119f9a7da91SVitaly Kuznetsov struct net_device_context *net_device_ctx, 112071790a27SHaiyang Zhang struct nvsp_message *nvmsg) 112171790a27SHaiyang Zhang { 112271790a27SHaiyang Zhang switch (nvmsg->hdr.msg_type) { 112371790a27SHaiyang Zhang case NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE: 112471790a27SHaiyang Zhang netvsc_send_table(hdev, nvmsg); 112571790a27SHaiyang Zhang break; 112671790a27SHaiyang Zhang 112771790a27SHaiyang Zhang case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION: 1128f9a7da91SVitaly Kuznetsov netvsc_send_vf(net_device_ctx, nvmsg); 112971790a27SHaiyang Zhang break; 113071790a27SHaiyang Zhang } 113171790a27SHaiyang Zhang } 113271790a27SHaiyang Zhang 113315a863bfSstephen hemminger static int netvsc_process_raw_pkt(struct hv_device *device, 113499a50bb1SK. Y. Srinivasan struct vmbus_channel *channel, 113599a50bb1SK. Y. Srinivasan struct netvsc_device *net_device, 113699a50bb1SK. Y. Srinivasan struct net_device *ndev, 1137f9645430Sstephen hemminger const struct vmpacket_descriptor *desc, 1138f9645430Sstephen hemminger int budget) 113999a50bb1SK. Y. Srinivasan { 1140f9a7da91SVitaly Kuznetsov struct net_device_context *net_device_ctx = netdev_priv(ndev); 1141f3dd3f47Sstephen hemminger struct nvsp_message *nvmsg = hv_pkt_data(desc); 114299a50bb1SK. Y. Srinivasan 114399a50bb1SK. Y. Srinivasan switch (desc->type) { 114499a50bb1SK. Y. Srinivasan case VM_PKT_COMP: 1145f9645430Sstephen hemminger netvsc_send_completion(net_device, channel, device, 1146f9645430Sstephen hemminger desc, budget); 114799a50bb1SK. Y. Srinivasan break; 114899a50bb1SK. Y. Srinivasan 114999a50bb1SK. Y. Srinivasan case VM_PKT_DATA_USING_XFER_PAGES: 115015a863bfSstephen hemminger return netvsc_receive(ndev, net_device, net_device_ctx, 1151f3dd3f47Sstephen hemminger device, channel, desc, nvmsg); 115299a50bb1SK. Y. Srinivasan break; 115399a50bb1SK. Y. Srinivasan 115499a50bb1SK. Y. Srinivasan case VM_PKT_DATA_INBAND: 1155f9a7da91SVitaly Kuznetsov netvsc_receive_inband(device, net_device_ctx, nvmsg); 115699a50bb1SK. Y. Srinivasan break; 115799a50bb1SK. Y. Srinivasan 115899a50bb1SK. Y. Srinivasan default: 115999a50bb1SK. Y. Srinivasan netdev_err(ndev, "unhandled packet type %d, tid %llx\n", 1160f4f1c23dSstephen hemminger desc->type, desc->trans_id); 116199a50bb1SK. Y. Srinivasan break; 116299a50bb1SK. Y. Srinivasan } 116315a863bfSstephen hemminger 116415a863bfSstephen hemminger return 0; 116515a863bfSstephen hemminger } 116615a863bfSstephen hemminger 116715a863bfSstephen hemminger static struct hv_device *netvsc_channel_to_device(struct vmbus_channel *channel) 116815a863bfSstephen hemminger { 116915a863bfSstephen hemminger struct vmbus_channel *primary = channel->primary_channel; 117015a863bfSstephen hemminger 117115a863bfSstephen hemminger return primary ? primary->device_obj : channel->device_obj; 117215a863bfSstephen hemminger } 117315a863bfSstephen hemminger 1174262b7f14Sstephen hemminger /* Network processing softirq 1175262b7f14Sstephen hemminger * Process data in incoming ring buffer from host 1176262b7f14Sstephen hemminger * Stops when ring is empty or budget is met or exceeded. 1177262b7f14Sstephen hemminger */ 117815a863bfSstephen hemminger int netvsc_poll(struct napi_struct *napi, int budget) 117915a863bfSstephen hemminger { 118015a863bfSstephen hemminger struct netvsc_channel *nvchan 118115a863bfSstephen hemminger = container_of(napi, struct netvsc_channel, napi); 118235fbbccfSstephen hemminger struct netvsc_device *net_device = nvchan->net_device; 118315a863bfSstephen hemminger struct vmbus_channel *channel = nvchan->channel; 118415a863bfSstephen hemminger struct hv_device *device = netvsc_channel_to_device(channel); 118515a863bfSstephen hemminger struct net_device *ndev = hv_get_drvdata(device); 118615a863bfSstephen hemminger int work_done = 0; 118715a863bfSstephen hemminger 1188f4f1c23dSstephen hemminger /* If starting a new interval */ 1189f4f1c23dSstephen hemminger if (!nvchan->desc) 1190f4f1c23dSstephen hemminger nvchan->desc = hv_pkt_iter_first(channel); 119115a863bfSstephen hemminger 1192f4f1c23dSstephen hemminger while (nvchan->desc && work_done < budget) { 1193f4f1c23dSstephen hemminger work_done += netvsc_process_raw_pkt(device, channel, net_device, 1194f9645430Sstephen hemminger ndev, nvchan->desc, budget); 1195f4f1c23dSstephen hemminger nvchan->desc = hv_pkt_iter_next(channel, nvchan->desc); 119615a863bfSstephen hemminger } 119715a863bfSstephen hemminger 11987426b1a5Sstephen hemminger /* If send of pending receive completions suceeded 11997426b1a5Sstephen hemminger * and did not exhaust NAPI budget 1200f4f1c23dSstephen hemminger * and not doing busy poll 12017426b1a5Sstephen hemminger * then reschedule if more data has arrived from host 1202262b7f14Sstephen hemminger */ 12037426b1a5Sstephen hemminger if (send_recv_completions(nvchan) == 0 && 12047426b1a5Sstephen hemminger work_done < budget && 120515a863bfSstephen hemminger napi_complete_done(napi, work_done) && 12067426b1a5Sstephen hemminger hv_end_read(&channel->inbound)) { 12077426b1a5Sstephen hemminger hv_begin_read(&channel->inbound); 120815a863bfSstephen hemminger napi_reschedule(napi); 12097426b1a5Sstephen hemminger } 1210f4f1c23dSstephen hemminger 1211f4f1c23dSstephen hemminger /* Driver may overshoot since multiple packets per descriptor */ 1212f4f1c23dSstephen hemminger return min(work_done, budget); 121399a50bb1SK. Y. Srinivasan } 121499a50bb1SK. Y. Srinivasan 1215262b7f14Sstephen hemminger /* Call back when data is available in host ring buffer. 1216262b7f14Sstephen hemminger * Processing is deferred until network softirq (NAPI) 1217262b7f14Sstephen hemminger */ 12185b54dac8SHaiyang Zhang void netvsc_channel_cb(void *context) 121995fa0405SHaiyang Zhang { 12206de38af6Sstephen hemminger struct netvsc_channel *nvchan = context; 122143bf99ceSstephen hemminger struct vmbus_channel *channel = nvchan->channel; 122243bf99ceSstephen hemminger struct hv_ring_buffer_info *rbi = &channel->inbound; 122343bf99ceSstephen hemminger 122443bf99ceSstephen hemminger /* preload first vmpacket descriptor */ 122543bf99ceSstephen hemminger prefetch(hv_get_ring_buffer(rbi) + rbi->priv_read_index); 122695fa0405SHaiyang Zhang 1227f4f1c23dSstephen hemminger if (napi_schedule_prep(&nvchan->napi)) { 122815a863bfSstephen hemminger /* disable interupts from host */ 122943bf99ceSstephen hemminger hv_begin_read(rbi); 12300d6dd357Sstephen hemminger 1231f4f1c23dSstephen hemminger __napi_schedule(&nvchan->napi); 1232f4f1c23dSstephen hemminger } 123395fa0405SHaiyang Zhang } 123495fa0405SHaiyang Zhang 123595fa0405SHaiyang Zhang /* 123695fa0405SHaiyang Zhang * netvsc_device_add - Callback when the device belonging to this 123795fa0405SHaiyang Zhang * driver is added 123895fa0405SHaiyang Zhang */ 12399749fed5Sstephen hemminger struct netvsc_device *netvsc_device_add(struct hv_device *device, 12402c7f83caSstephen hemminger const struct netvsc_device_info *device_info) 124195fa0405SHaiyang Zhang { 124288098834SVitaly Kuznetsov int i, ret = 0; 12432c7f83caSstephen hemminger int ring_size = device_info->ring_size; 124495fa0405SHaiyang Zhang struct netvsc_device *net_device; 124588098834SVitaly Kuznetsov struct net_device *ndev = hv_get_drvdata(device); 124688098834SVitaly Kuznetsov struct net_device_context *net_device_ctx = netdev_priv(ndev); 124795fa0405SHaiyang Zhang 124888098834SVitaly Kuznetsov net_device = alloc_net_device(); 1249b1c84927SDan Carpenter if (!net_device) 12509749fed5Sstephen hemminger return ERR_PTR(-ENOMEM); 125195fa0405SHaiyang Zhang 12525b54dac8SHaiyang Zhang net_device->ring_size = ring_size; 12535b54dac8SHaiyang Zhang 125415a863bfSstephen hemminger /* Because the device uses NAPI, all the interrupt batching and 125515a863bfSstephen hemminger * control is done via Net softirq, not the channel handling 125615a863bfSstephen hemminger */ 125715a863bfSstephen hemminger set_channel_read_mode(device->channel, HV_CALL_ISR); 125815a863bfSstephen hemminger 1259bffb1842SK. Y. Srinivasan /* If we're reopening the device we may have multiple queues, fill the 1260bffb1842SK. Y. Srinivasan * chn_table with the default channel to use it before subchannels are 1261bffb1842SK. Y. Srinivasan * opened. 1262bffb1842SK. Y. Srinivasan * Initialize the channel state before we open; 1263bffb1842SK. Y. Srinivasan * we can be interrupted as soon as we open the channel. 1264bffb1842SK. Y. Srinivasan */ 1265bffb1842SK. Y. Srinivasan 1266bffb1842SK. Y. Srinivasan for (i = 0; i < VRSS_CHANNEL_MAX; i++) { 1267bffb1842SK. Y. Srinivasan struct netvsc_channel *nvchan = &net_device->chan_table[i]; 1268bffb1842SK. Y. Srinivasan 1269bffb1842SK. Y. Srinivasan nvchan->channel = device->channel; 127035fbbccfSstephen hemminger nvchan->net_device = net_device; 1271bffb1842SK. Y. Srinivasan } 1272bffb1842SK. Y. Srinivasan 12732be0f264Sstephen hemminger /* Enable NAPI handler before init callbacks */ 12742be0f264Sstephen hemminger netif_napi_add(ndev, &net_device->chan_table[0].napi, 12752be0f264Sstephen hemminger netvsc_poll, NAPI_POLL_WEIGHT); 12762be0f264Sstephen hemminger 127795fa0405SHaiyang Zhang /* Open the channel */ 127895fa0405SHaiyang Zhang ret = vmbus_open(device->channel, ring_size * PAGE_SIZE, 127995fa0405SHaiyang Zhang ring_size * PAGE_SIZE, NULL, 0, 12806de38af6Sstephen hemminger netvsc_channel_cb, 12816de38af6Sstephen hemminger net_device->chan_table); 128295fa0405SHaiyang Zhang 128395fa0405SHaiyang Zhang if (ret != 0) { 12842be0f264Sstephen hemminger netif_napi_del(&net_device->chan_table[0].napi); 128595fa0405SHaiyang Zhang netdev_err(ndev, "unable to open channel: %d\n", ret); 128695fa0405SHaiyang Zhang goto cleanup; 128795fa0405SHaiyang Zhang } 128895fa0405SHaiyang Zhang 128995fa0405SHaiyang Zhang /* Channel is opened */ 129093ba2222SVitaly Kuznetsov netdev_dbg(ndev, "hv_netvsc channel opened successfully\n"); 129195fa0405SHaiyang Zhang 129215a863bfSstephen hemminger napi_enable(&net_device->chan_table[0].napi); 129388098834SVitaly Kuznetsov 129488098834SVitaly Kuznetsov /* Writing nvdev pointer unlocks netvsc_send(), make sure chn_table is 129588098834SVitaly Kuznetsov * populated. 129688098834SVitaly Kuznetsov */ 1297545a8e79Sstephen hemminger rcu_assign_pointer(net_device_ctx->nvdev, net_device); 12985b54dac8SHaiyang Zhang 129995fa0405SHaiyang Zhang /* Connect with the NetVsp */ 130095790837Sstephen hemminger ret = netvsc_connect_vsp(device, net_device); 130195fa0405SHaiyang Zhang if (ret != 0) { 130295fa0405SHaiyang Zhang netdev_err(ndev, 130395fa0405SHaiyang Zhang "unable to connect to NetVSP - %d\n", ret); 130495fa0405SHaiyang Zhang goto close; 130595fa0405SHaiyang Zhang } 130695fa0405SHaiyang Zhang 13079749fed5Sstephen hemminger return net_device; 130895fa0405SHaiyang Zhang 130995fa0405SHaiyang Zhang close: 131076bb5db5Sstephen hemminger netif_napi_del(&net_device->chan_table[0].napi); 131115a863bfSstephen hemminger 131295fa0405SHaiyang Zhang /* Now, we can close the channel safely */ 131395fa0405SHaiyang Zhang vmbus_close(device->channel); 131495fa0405SHaiyang Zhang 131595fa0405SHaiyang Zhang cleanup: 1316545a8e79Sstephen hemminger free_netvsc_device(&net_device->rcu); 131795fa0405SHaiyang Zhang 13189749fed5Sstephen hemminger return ERR_PTR(ret); 131995fa0405SHaiyang Zhang } 1320