From c25aaf814a63f9d9c4e45416f13d70ef0aa0be2e Mon Sep 17 00:00:00 2001 From: KY Srinivasan Date: Wed, 30 Apr 2014 10:14:31 -0700 Subject: hyperv: Enable sendbuf mechanism on the send path We send packets using a copy-free mechanism (this is the Guest to Host transport via VMBUS). While this is obviously optimal for large packets, it may not be optimal for small packets. Hyper-V host supports a second mechanism for sending packets that is "copy based". We implement that mechanism in this patch. In this version of the patch I have addressed a comment from David Miller. With this patch (and all of the other offload and VRSS patches), we are now able to almost saturate a 10G interface between Linux VMs on Hyper-V on different hosts - close to 9 Gbps as measured via iperf. Signed-off-by: K. Y. Srinivasan Reviewed-by: Haiyang Zhang Signed-off-by: David S. Miller --- drivers/net/hyperv/hyperv_net.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'drivers/net/hyperv/hyperv_net.h') diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h index d1f7826..4b7df5a 100644 --- a/drivers/net/hyperv/hyperv_net.h +++ b/drivers/net/hyperv/hyperv_net.h @@ -140,6 +140,8 @@ struct hv_netvsc_packet { void *send_completion_ctx; void (*send_completion)(void *context); + u32 send_buf_index; + /* This points to the memory after page_buf */ struct rndis_message *rndis_msg; @@ -582,6 +584,9 @@ struct nvsp_message { #define NETVSC_RECEIVE_BUFFER_SIZE (1024*1024*16) /* 16MB */ #define NETVSC_RECEIVE_BUFFER_SIZE_LEGACY (1024*1024*15) /* 15MB */ +#define NETVSC_SEND_BUFFER_SIZE (1024 * 1024) /* 1MB */ +#define NETVSC_INVALID_INDEX -1 + #define NETVSC_RECEIVE_BUFFER_ID 0xcafe @@ -607,6 +612,15 @@ struct netvsc_device { u32 recv_section_cnt; struct nvsp_1_receive_buffer_section *recv_section; + /* Send buffer allocated by us */ + void *send_buf; + u32 send_buf_size; + u32 send_buf_gpadl_handle; + u32 send_section_cnt; + u32 send_section_size; + unsigned long *send_section_map; + int map_words; + /* Used for NetVSP initialization protocol */ struct completion channel_init_wait; struct nvsp_message channel_init_pkt; -- cgit v1.1