+#if EFSYS_OPT_RX_SCATTER
+static __checkReturn efx_rc_t
+siena_rx_scatter_enable(
+ __in efx_nic_t *enp,
+ __in unsigned int buf_size)
+{
+ unsigned int nbuf32;
+ efx_oword_t oword;
+ efx_rc_t rc;
+
+ nbuf32 = buf_size / 32;
+ if ((nbuf32 == 0) ||
+ (nbuf32 >= (1 << FRF_BZ_RX_USR_BUF_SIZE_WIDTH)) ||
+ ((buf_size % 32) != 0)) {
+ rc = EINVAL;
+ goto fail1;
+ }
+
+ if (enp->en_rx_qcount > 0) {
+ rc = EBUSY;
+ goto fail2;
+ }
+
+ /* Set scatter buffer size */
+ EFX_BAR_READO(enp, FR_AZ_RX_CFG_REG, &oword);
+ EFX_SET_OWORD_FIELD(oword, FRF_BZ_RX_USR_BUF_SIZE, nbuf32);
+ EFX_BAR_WRITEO(enp, FR_AZ_RX_CFG_REG, &oword);
+
+ /* Enable scatter for packets not matching a filter */
+ EFX_BAR_READO(enp, FR_AZ_RX_FILTER_CTL_REG, &oword);
+ EFX_SET_OWORD_FIELD(oword, FRF_BZ_SCATTER_ENBL_NO_MATCH_Q, 1);
+ EFX_BAR_WRITEO(enp, FR_AZ_RX_FILTER_CTL_REG, &oword);
+
+ return (0);
+
+fail2:
+ EFSYS_PROBE(fail2);
+fail1:
+ EFSYS_PROBE1(fail1, efx_rc_t, rc);
+
+ return (rc);
+}
+#endif /* EFSYS_OPT_RX_SCATTER */
+