static int
cxgbei_ddp_init(struct adapter *sc, struct cxgbei_data *ci)
{
int nppods, bits, max_sz, rc;
static const u_int pgsz_order[] = {0, 1, 2, 3};
MPASS(sc->vres.iscsi.size > 0);
ci->llimit = sc->vres.iscsi.start;
ci->ulimit = sc->vres.iscsi.start + sc->vres.iscsi.size - 1;
max_sz = G_MAXRXDATA(t4_read_reg(sc, A_TP_PARA_REG2));
nppods = sc->vres.iscsi.size >> IPPOD_SIZE_SHIFT;
if (nppods <= 1024)
return (ENXIO);
bits = fls(nppods);
if (bits > IPPOD_IDX_MAX_SIZE)
bits = IPPOD_IDX_MAX_SIZE;
nppods = (1 << (bits - 1)) - 1;
rc = bus_dma_tag_create(NULL, 1, 0, BUS_SPACE_MAXADDR,
BUS_SPACE_MAXADDR, NULL, NULL, UINT32_MAX , 8, BUS_SPACE_MAXSIZE,
BUS_DMA_ALLOCNOW, NULL, NULL, &ci->ulp_ddp_tag);
if (rc != 0) {
device_printf(sc->dev, "%s: failed to create DMA tag: %u.\n",
__func__, rc);
return (rc);
}
ci->colors = malloc(nppods * sizeof(char), M_CXGBE, M_NOWAIT | M_ZERO);
ci->gl_map = malloc(nppods * sizeof(struct cxgbei_ulp2_gather_list *),
M_CXGBE, M_NOWAIT | M_ZERO);
if (ci->colors == NULL || ci->gl_map == NULL) {
bus_dma_tag_destroy(ci->ulp_ddp_tag);
free(ci->colors, M_CXGBE);
free(ci->gl_map, M_CXGBE);
return (ENOMEM);
}
mtx_init(&ci->map_lock, "ddp lock", NULL, MTX_DEF | MTX_DUPOK);
ci->max_txsz = ci->max_rxsz = min(max_sz, ULP2_MAX_PKT_SIZE);
ci->nppods = nppods;
ci->idx_last = nppods;
ci->idx_bits = bits;
ci->idx_mask = (1 << bits) - 1;
ci->rsvd_tag_mask = (1 << (bits + IPPOD_IDX_SHIFT)) - 1;
ci->tag_format.sw_bits = bits;
ci->tag_format.rsvd_bits = bits;
ci->tag_format.rsvd_shift = IPPOD_IDX_SHIFT;
ci->tag_format.rsvd_mask = ci->idx_mask;
t4_iscsi_init(sc, ci->idx_mask << IPPOD_IDX_SHIFT, pgsz_order);
return (rc);
}
static void
read_pdu_limits(struct adapter *sc, uint32_t *max_tx_pdu_len,
uint32_t *max_rx_pdu_len)
{
uint32_t tx_len, rx_len, r, v;
rx_len = t4_read_reg(sc, A_TP_PMM_RX_PAGE_SIZE);
tx_len = t4_read_reg(sc, A_TP_PMM_TX_PAGE_SIZE);
r = t4_read_reg(sc, A_TP_PARA_REG2);
rx_len = min(rx_len, G_MAXRXDATA(r));
tx_len = min(tx_len, G_MAXRXDATA(r));
r = t4_read_reg(sc, A_TP_PARA_REG7);
v = min(G_PMMAXXFERLEN0(r), G_PMMAXXFERLEN1(r));
rx_len = min(rx_len, v);
tx_len = min(tx_len, v);
/* Remove after FW_FLOWC_MNEM_TXDATAPLEN_MAX fix in firmware. */
tx_len = min(tx_len, 3 * 4096);
*max_tx_pdu_len = rounddown2(tx_len, 512);
*max_rx_pdu_len = rounddown2(rx_len, 512);
}
