[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH 4/5] net: netvsc: Add Isolation VM support for netvsc driver
From: Tianyu Lan <Tianyu.Lan@xxxxxxxxxxxxx> In Isolation VM, all shared memory with host needs to mark visible to host via hvcall. vmbus_establish_gpadl() has already done it for netvsc rx/tx ring buffer. The page buffer used by vmbus_sendpacket_ pagebuffer() stills need to be handled. Use DMA API to map/umap these memory during sending/receiving packet and Hyper-V swiotlb bounce buffer dma address will be returned. The swiotlb bounce buffer has been masked to be visible to host during boot up. Allocate rx/tx ring buffer via dma_alloc_noncontiguous() in Isolation VM. After calling vmbus_establish_gpadl() which marks these pages visible to host, map these pages unencrypted addes space via dma_vmap_noncontiguous(). Signed-off-by: Tianyu Lan <Tianyu.Lan@xxxxxxxxxxxxx> --- drivers/net/hyperv/hyperv_net.h | 5 + drivers/net/hyperv/netvsc.c | 192 +++++++++++++++++++++++++++--- drivers/net/hyperv/rndis_filter.c | 2 + include/linux/hyperv.h | 6 + 4 files changed, 190 insertions(+), 15 deletions(-) diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h index 315278a7cf88..31c77a00d01e 100644 --- a/drivers/net/hyperv/hyperv_net.h +++ b/drivers/net/hyperv/hyperv_net.h @@ -164,6 +164,7 @@ struct hv_netvsc_packet { u32 total_bytes; u32 send_buf_index; u32 total_data_buflen; + struct hv_dma_range *dma_range; }; #define NETVSC_HASH_KEYLEN 40 @@ -1074,6 +1075,7 @@ struct netvsc_device { /* Receive buffer allocated by us but manages by NetVSP */ void *recv_buf; + struct sg_table *recv_sgt; u32 recv_buf_size; /* allocated bytes */ struct vmbus_gpadl recv_buf_gpadl_handle; u32 recv_section_cnt; @@ -1082,6 +1084,7 @@ struct netvsc_device { /* Send buffer allocated by us */ void *send_buf; + struct sg_table *send_sgt; u32 send_buf_size; struct vmbus_gpadl send_buf_gpadl_handle; u32 send_section_cnt; @@ -1731,4 +1734,6 @@ struct rndis_message { #define RETRY_US_HI 10000 #define RETRY_MAX 2000 /* >10 sec */ +void netvsc_dma_unmap(struct hv_device *hv_dev, + struct hv_netvsc_packet *packet); #endif /* _HYPERV_NET_H */ diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c index 396bc1c204e6..9cdc71930830 100644 --- a/drivers/net/hyperv/netvsc.c +++ b/drivers/net/hyperv/netvsc.c @@ -20,6 +20,7 @@ #include <linux/vmalloc.h> #include <linux/rtnetlink.h> #include <linux/prefetch.h> +#include <linux/gfp.h> #include <asm/sync_bitops.h> #include <asm/mshyperv.h> @@ -146,15 +147,39 @@ static struct netvsc_device *alloc_net_device(void) return net_device; } +static struct hv_device *netvsc_channel_to_device(struct vmbus_channel *channel) +{ + struct vmbus_channel *primary = channel->primary_channel; + + return primary ? primary->device_obj : channel->device_obj; +} + static void free_netvsc_device(struct rcu_head *head) { struct netvsc_device *nvdev = container_of(head, struct netvsc_device, rcu); + struct hv_device *dev = + netvsc_channel_to_device(nvdev->chan_table[0].channel); int i; kfree(nvdev->extension); - vfree(nvdev->recv_buf); - vfree(nvdev->send_buf); + + if (nvdev->recv_sgt) { + dma_vunmap_noncontiguous(&dev->device, nvdev->recv_buf); + dma_free_noncontiguous(&dev->device, nvdev->recv_buf_size, + nvdev->recv_sgt, DMA_FROM_DEVICE); + } else { + vfree(nvdev->recv_buf); + } + + if (nvdev->send_sgt) { + dma_vunmap_noncontiguous(&dev->device, nvdev->send_buf); + dma_free_noncontiguous(&dev->device, nvdev->send_buf_size, + nvdev->send_sgt, DMA_TO_DEVICE); + } else { + vfree(nvdev->send_buf); + } + kfree(nvdev->send_section_map); for (i = 0; i < VRSS_CHANNEL_MAX; i++) { @@ -348,7 +373,21 @@ static int netvsc_init_buf(struct hv_device *device, buf_size = min_t(unsigned int, buf_size, NETVSC_RECEIVE_BUFFER_SIZE_LEGACY); - net_device->recv_buf = vzalloc(buf_size); + if (hv_isolation_type_snp()) { + net_device->recv_sgt = + dma_alloc_noncontiguous(&device->device, buf_size, + DMA_FROM_DEVICE, GFP_KERNEL, 0); + if (!net_device->recv_sgt) { + pr_err("Fail to allocate recv buffer buf_size %d.\n.", buf_size); + ret = -ENOMEM; + goto cleanup; + } + + net_device->recv_buf = (void *)net_device->recv_sgt->sgl->dma_address; + } else { + net_device->recv_buf = vzalloc(buf_size); + } + if (!net_device->recv_buf) { netdev_err(ndev, "unable to allocate receive buffer of size %u\n", @@ -357,8 +396,6 @@ static int netvsc_init_buf(struct hv_device *device, goto cleanup; } - net_device->recv_buf_size = buf_size; - /* * Establish the gpadl handle for this buffer on this * channel. Note: This call uses the vmbus connection rather @@ -373,6 +410,19 @@ static int netvsc_init_buf(struct hv_device *device, goto cleanup; } + if (net_device->recv_sgt) { + net_device->recv_buf = + dma_vmap_noncontiguous(&device->device, buf_size, + net_device->recv_sgt); + if (!net_device->recv_buf) { + pr_err("Fail to vmap recv buffer.\n"); + ret = -ENOMEM; + goto cleanup; + } + } + + net_device->recv_buf_size = buf_size; + /* Notify the NetVsp of the gpadl handle */ init_packet = &net_device->channel_init_pkt; memset(init_packet, 0, sizeof(struct nvsp_message)); @@ -454,14 +504,27 @@ static int netvsc_init_buf(struct hv_device *device, buf_size = device_info->send_sections * device_info->send_section_size; buf_size = round_up(buf_size, PAGE_SIZE); - net_device->send_buf = vzalloc(buf_size); + if (hv_isolation_type_snp()) { + net_device->send_sgt = + dma_alloc_noncontiguous(&device->device, buf_size, + DMA_TO_DEVICE, GFP_KERNEL, 0); + if (!net_device->send_sgt) { + pr_err("Fail to allocate send buffer buf_size %d.\n.", buf_size); + ret = -ENOMEM; + goto cleanup; + } + + net_device->send_buf = (void *)net_device->send_sgt->sgl->dma_address; + } else { + net_device->send_buf = vzalloc(buf_size); + } + if (!net_device->send_buf) { netdev_err(ndev, "unable to allocate send buffer of size %u\n", buf_size); ret = -ENOMEM; goto cleanup; } - net_device->send_buf_size = buf_size; /* Establish the gpadl handle for this buffer on this * channel. Note: This call uses the vmbus connection rather @@ -476,6 +539,19 @@ static int netvsc_init_buf(struct hv_device *device, goto cleanup; } + if (net_device->send_sgt) { + net_device->send_buf = + dma_vmap_noncontiguous(&device->device, buf_size, + net_device->send_sgt); + if (!net_device->send_buf) { + pr_err("Fail to vmap send buffer.\n"); + ret = -ENOMEM; + goto cleanup; + } + } + + net_device->send_buf_size = buf_size; + /* Notify the NetVsp of the gpadl handle */ init_packet = &net_device->channel_init_pkt; memset(init_packet, 0, sizeof(struct nvsp_message)); @@ -766,7 +842,7 @@ static void netvsc_send_tx_complete(struct net_device *ndev, /* Notify the layer above us */ if (likely(skb)) { - const struct hv_netvsc_packet *packet + struct hv_netvsc_packet *packet = (struct hv_netvsc_packet *)skb->cb; u32 send_index = packet->send_buf_index; struct netvsc_stats *tx_stats; @@ -782,6 +858,7 @@ static void netvsc_send_tx_complete(struct net_device *ndev, tx_stats->bytes += packet->total_bytes; u64_stats_update_end(&tx_stats->syncp); + netvsc_dma_unmap(ndev_ctx->device_ctx, packet); napi_consume_skb(skb, budget); } @@ -946,6 +1023,87 @@ static void netvsc_copy_to_send_buf(struct netvsc_device *net_device, memset(dest, 0, padding); } +void netvsc_dma_unmap(struct hv_device *hv_dev, + struct hv_netvsc_packet *packet) +{ + u32 page_count = packet->cp_partial ? + packet->page_buf_cnt - packet->rmsg_pgcnt : + packet->page_buf_cnt; + int i; + + if (!hv_is_isolation_supported()) + return; + + if (!packet->dma_range) + return; + + for (i = 0; i < page_count; i++) + dma_unmap_single(&hv_dev->device, packet->dma_range[i].dma, + packet->dma_range[i].mapping_size, + DMA_TO_DEVICE); + + kfree(packet->dma_range); +} + +/* netvsc_dma_map - Map swiotlb bounce buffer with data page of + * packet sent by vmbus_sendpacket_pagebuffer() in the Isolation + * VM. + * + * In isolation VM, netvsc send buffer has been marked visible to + * host and so the data copied to send buffer doesn't need to use + * bounce buffer. The data pages handled by vmbus_sendpacket_pagebuffer() + * may not be copied to send buffer and so these pages need to be + * mapped with swiotlb bounce buffer. netvsc_dma_map() is to do + * that. The pfns in the struct hv_page_buffer need to be converted + * to bounce buffer's pfn. The loop here is necessary because the + * entries in the page buffer array are not necessarily full + * pages of data. Each entry in the array has a separate offset and + * len that may be non-zero, even for entries in the middle of the + * array. And the entries are not physically contiguous. So each + * entry must be individually mapped rather than as a contiguous unit. + * So not use dma_map_sg() here. + */ +static int netvsc_dma_map(struct hv_device *hv_dev, + struct hv_netvsc_packet *packet, + struct hv_page_buffer *pb) +{ + u32 page_count = packet->cp_partial ? + packet->page_buf_cnt - packet->rmsg_pgcnt : + packet->page_buf_cnt; + dma_addr_t dma; + int i; + + if (!hv_is_isolation_supported()) + return 0; + + packet->dma_range = kcalloc(page_count, + sizeof(*packet->dma_range), + GFP_KERNEL); + if (!packet->dma_range) + return -ENOMEM; + + for (i = 0; i < page_count; i++) { + char *src = phys_to_virt((pb[i].pfn << HV_HYP_PAGE_SHIFT) + + pb[i].offset); + u32 len = pb[i].len; + + dma = dma_map_single(&hv_dev->device, src, len, + DMA_TO_DEVICE); + if (dma_mapping_error(&hv_dev->device, dma)) { + kfree(packet->dma_range); + return -ENOMEM; + } + + packet->dma_range[i].dma = dma; + packet->dma_range[i].mapping_size = len; + pb[i].pfn = dma >> HV_HYP_PAGE_SHIFT; + pb[i].offset = offset_in_hvpage(dma); + pb[i].len = len; + } + + return 0; +} + static inline int netvsc_send_pkt( struct hv_device *device, struct hv_netvsc_packet *packet, @@ -986,14 +1144,24 @@ static inline int netvsc_send_pkt( trace_nvsp_send_pkt(ndev, out_channel, rpkt); + packet->dma_range = NULL; if (packet->page_buf_cnt) { if (packet->cp_partial) pb += packet->rmsg_pgcnt; + ret = netvsc_dma_map(ndev_ctx->device_ctx, packet, pb); + if (ret) { + ret = -EAGAIN; + goto exit; + } + ret = vmbus_sendpacket_pagebuffer(out_channel, pb, packet->page_buf_cnt, &nvmsg, sizeof(nvmsg), req_id); + + if (ret) + netvsc_dma_unmap(ndev_ctx->device_ctx, packet); } else { ret = vmbus_sendpacket(out_channel, &nvmsg, sizeof(nvmsg), @@ -1001,6 +1169,7 @@ static inline int netvsc_send_pkt( VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); } +exit: if (ret == 0) { atomic_inc_return(&nvchan->queue_sends); @@ -1515,13 +1684,6 @@ static int netvsc_process_raw_pkt(struct hv_device *device, return 0; } -static struct hv_device *netvsc_channel_to_device(struct vmbus_channel *channel) -{ - struct vmbus_channel *primary = channel->primary_channel; - - return primary ? primary->device_obj : channel->device_obj; -} - /* Network processing softirq * Process data in incoming ring buffer from host * Stops when ring is empty or budget is met or exceeded. diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c index f6c9c2a670f9..448fcc325ed7 100644 --- a/drivers/net/hyperv/rndis_filter.c +++ b/drivers/net/hyperv/rndis_filter.c @@ -361,6 +361,8 @@ static void rndis_filter_receive_response(struct net_device *ndev, } } + netvsc_dma_unmap(((struct net_device_context *) + netdev_priv(ndev))->device_ctx, &request->pkt); complete(&request->wait_event); } else { netdev_err(ndev, diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index 4d44fb3b3f1c..8882e46d1070 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -25,6 +25,7 @@ #include <linux/interrupt.h> #include <linux/reciprocal_div.h> #include <asm/hyperv-tlfs.h> +#include <linux/dma-map-ops.h> #define MAX_PAGE_BUFFER_COUNT 32 #define MAX_MULTIPAGE_BUFFER_COUNT 32 /* 128K */ @@ -1583,6 +1584,11 @@ struct hyperv_service_callback { void (*callback)(void *context); }; +struct hv_dma_range { + dma_addr_t dma; + u32 mapping_size; +}; + #define MAX_SRV_VER 0x7ffffff extern bool vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp, u8 *buf, u32 buflen, const int *fw_version, int fw_vercnt, -- 2.25.1
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