mckey: fix the ibv_sge start address for function ibv_post_send
#1441
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For UD QP, the struct `ibv_grh` at the head of registed MR used for `ibv_post_send`, the data to be sent is immediately after the struct `ibv_grh` in the MR. So, the ibv_sge start address should be the start address of MR add the sizeof(struct ibv_grh). Signed-off-by: Honggang LI <[email protected]>
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For UD QP, the struct
ibv_grhat the head of registed MR used foribv_post_send, the data to be sent is immediately after the structibv_grhin the MR. So, the ibv_sge start address should be the start address of MR add the sizeof(struct ibv_grh).