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| author | K. Y. Srinivasan <kys@microsoft.com> | 2015-01-09 23:54:34 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-01-25 09:17:58 -0800 |
| commit | d61031ee8df6214d58371a1cc36a0591e242fba0 (patch) | |
| tree | 6363854d2630ca9f87d90f45961aef04c04b17d1 /include/linux/hyperv.h | |
| parent | 9f52a1630922bcdab75fc72e59ed58db8e164314 (diff) | |
| download | lwn-d61031ee8df6214d58371a1cc36a0591e242fba0.tar.gz lwn-d61031ee8df6214d58371a1cc36a0591e242fba0.zip | |
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>
Diffstat (limited to 'include/linux/hyperv.h')
| -rw-r--r-- | include/linux/hyperv.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index 476c685ca6f9..259023a34bec 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -57,6 +57,18 @@ struct hv_multipage_buffer { u64 pfn_array[MAX_MULTIPAGE_BUFFER_COUNT]; }; +/* + * Multiple-page buffer array; the pfn array is variable size: + * The number of entries in the PFN array is determined by + * "len" and "offset". + */ +struct hv_mpb_array { + /* Length and Offset determines the # of pfns in the array */ + u32 len; + u32 offset; + u64 pfn_array[]; +}; + /* 0x18 includes the proprietary packet header */ #define MAX_PAGE_BUFFER_PACKET (0x18 + \ (sizeof(struct hv_page_buffer) * \ @@ -814,6 +826,18 @@ struct vmbus_channel_packet_multipage_buffer { struct hv_multipage_buffer range; } __packed; +/* The format must be the same as struct vmdata_gpa_direct */ +struct vmbus_packet_mpb_array { + u16 type; + u16 dataoffset8; + u16 length8; + u16 flags; + u64 transactionid; + u32 reserved; + u32 rangecount; /* Always 1 in this case */ + struct hv_mpb_array range; +} __packed; + extern int vmbus_open(struct vmbus_channel *channel, u32 send_ringbuffersize, @@ -845,6 +869,13 @@ extern int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel, u32 bufferlen, u64 requestid); +extern int vmbus_sendpacket_mpb_desc(struct vmbus_channel *channel, + struct vmbus_packet_mpb_array *mpb, + u32 desc_size, + void *buffer, + u32 bufferlen, + u64 requestid); + extern int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, u32 size, |