Drivers: hv: vmbus: Support a vmbus API for efficiently sending page arrays
Currently, the API for sending a multi-page buffer over VMBUS is limited to a maximum pfn array of MAX_MULTIPAGE_BUFFER_COUNT. This limitation is not imposed by the host and unnecessarily limits the maximum payload that can be sent. Implement an API that does not have this restriction. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -683,6 +683,50 @@ int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
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}
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EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer);
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/*
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* vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet
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* using a GPADL Direct packet type.
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* The buffer includes the vmbus descriptor.
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*/
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int vmbus_sendpacket_mpb_desc(struct vmbus_channel *channel,
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struct vmbus_packet_mpb_array *desc,
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u32 desc_size,
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void *buffer, u32 bufferlen, u64 requestid)
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{
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int ret;
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u32 packetlen;
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u32 packetlen_aligned;
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struct kvec bufferlist[3];
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u64 aligned_data = 0;
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bool signal = false;
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packetlen = desc_size + bufferlen;
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packetlen_aligned = ALIGN(packetlen, sizeof(u64));
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/* Setup the descriptor */
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desc->type = VM_PKT_DATA_USING_GPA_DIRECT;
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desc->flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
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desc->dataoffset8 = desc_size >> 3; /* in 8-bytes grandularity */
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desc->length8 = (u16)(packetlen_aligned >> 3);
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desc->transactionid = requestid;
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desc->rangecount = 1;
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bufferlist[0].iov_base = desc;
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bufferlist[0].iov_len = desc_size;
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bufferlist[1].iov_base = buffer;
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bufferlist[1].iov_len = bufferlen;
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bufferlist[2].iov_base = &aligned_data;
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bufferlist[2].iov_len = (packetlen_aligned - packetlen);
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ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal);
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if (ret == 0 && signal)
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vmbus_setevent(channel);
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return ret;
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}
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EXPORT_SYMBOL_GPL(vmbus_sendpacket_mpb_desc);
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/*
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* vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet
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* using a GPADL Direct packet type.
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@ -57,6 +57,18 @@ struct hv_multipage_buffer {
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u64 pfn_array[MAX_MULTIPAGE_BUFFER_COUNT];
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};
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/*
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* Multiple-page buffer array; the pfn array is variable size:
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* The number of entries in the PFN array is determined by
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* "len" and "offset".
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*/
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struct hv_mpb_array {
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/* Length and Offset determines the # of pfns in the array */
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u32 len;
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u32 offset;
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u64 pfn_array[];
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};
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/* 0x18 includes the proprietary packet header */
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#define MAX_PAGE_BUFFER_PACKET (0x18 + \
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(sizeof(struct hv_page_buffer) * \
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@ -814,6 +826,18 @@ struct vmbus_channel_packet_multipage_buffer {
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struct hv_multipage_buffer range;
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} __packed;
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/* The format must be the same as struct vmdata_gpa_direct */
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struct vmbus_packet_mpb_array {
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u16 type;
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u16 dataoffset8;
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u16 length8;
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u16 flags;
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u64 transactionid;
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u32 reserved;
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u32 rangecount; /* Always 1 in this case */
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struct hv_mpb_array range;
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} __packed;
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extern int vmbus_open(struct vmbus_channel *channel,
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u32 send_ringbuffersize,
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@ -845,6 +869,13 @@ extern int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel,
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u32 bufferlen,
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u64 requestid);
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extern int vmbus_sendpacket_mpb_desc(struct vmbus_channel *channel,
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struct vmbus_packet_mpb_array *mpb,
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u32 desc_size,
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void *buffer,
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u32 bufferlen,
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u64 requestid);
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extern int vmbus_establish_gpadl(struct vmbus_channel *channel,
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void *kbuffer,
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u32 size,
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