BNXT_MAX_TX_TS
WRITE_ONCE(ptp->tx_avail, BNXT_MAX_TX_TS);
num_requests = BNXT_MAX_TX_TS - READ_ONCE(ptp->tx_avail);
ptp->tx_avail = BNXT_MAX_TX_TS;
struct bnxt_ptp_tx_req txts_req[BNXT_MAX_TX_TS];
#define NEXT_TXTS(idx) (((idx) + 1) & (BNXT_MAX_TX_TS - 1))