ph.data_offset += rv;
if (ph.data_offset == ph.data_length)
svm_fifo_dequeue_drop (f, ph.data_length + SESSION_CONN_HDR_LEN);
ph.data_offset += rv;
if (ph.data_offset == ph.data_length)
svm_fifo_dequeue_drop (f, ph.data_length + SESSION_CONN_HDR_LEN);