Revision 322fd48a hw/e1000.c
| b/hw/e1000.c | ||
|---|---|---|
| 631 | 631 |
return (s->mac_reg[RCTL] & E1000_RCTL_EN); |
| 632 | 632 |
} |
| 633 | 633 |
|
| 634 |
static bool e1000_has_rxbufs(E1000State *s, size_t total_size) |
|
| 635 |
{
|
|
| 636 |
int bufs; |
|
| 637 |
/* Fast-path short packets */ |
|
| 638 |
if (total_size <= s->rxbuf_size) {
|
|
| 639 |
return s->mac_reg[RDH] != s->mac_reg[RDT] || !s->check_rxov; |
|
| 640 |
} |
|
| 641 |
if (s->mac_reg[RDH] < s->mac_reg[RDT]) {
|
|
| 642 |
bufs = s->mac_reg[RDT] - s->mac_reg[RDH]; |
|
| 643 |
} else if (s->mac_reg[RDH] > s->mac_reg[RDT] || !s->check_rxov) {
|
|
| 644 |
bufs = s->mac_reg[RDLEN] / sizeof(struct e1000_rx_desc) + |
|
| 645 |
s->mac_reg[RDT] - s->mac_reg[RDH]; |
|
| 646 |
} else {
|
|
| 647 |
return false; |
|
| 648 |
} |
|
| 649 |
return total_size <= bufs * s->rxbuf_size; |
|
| 650 |
} |
|
| 651 |
|
|
| 634 | 652 |
static ssize_t |
| 635 | 653 |
e1000_receive(VLANClientState *nc, const uint8_t *buf, size_t size) |
| 636 | 654 |
{
|
| ... | ... | |
| 671 | 689 |
rdh_start = s->mac_reg[RDH]; |
| 672 | 690 |
desc_offset = 0; |
| 673 | 691 |
total_size = size + fcs_len(s); |
| 692 |
if (!e1000_has_rxbufs(s, total_size)) {
|
|
| 693 |
set_ics(s, 0, E1000_ICS_RXO); |
|
| 694 |
return -1; |
|
| 695 |
} |
|
| 674 | 696 |
do {
|
| 675 | 697 |
desc_size = total_size - desc_offset; |
| 676 | 698 |
if (desc_size > s->rxbuf_size) {
|
| 677 | 699 |
desc_size = s->rxbuf_size; |
| 678 | 700 |
} |
| 679 |
if (s->mac_reg[RDH] == s->mac_reg[RDT] && s->check_rxov) {
|
|
| 680 |
/* Discard all data written so far */ |
|
| 681 |
s->mac_reg[RDH] = rdh_start; |
|
| 682 |
set_ics(s, 0, E1000_ICS_RXO); |
|
| 683 |
return -1; |
|
| 684 |
} |
|
| 685 | 701 |
base = ((uint64_t)s->mac_reg[RDBAH] << 32) + s->mac_reg[RDBAL] + |
| 686 | 702 |
sizeof(desc) * s->mac_reg[RDH]; |
| 687 | 703 |
cpu_physical_memory_read(base, (void *)&desc, sizeof(desc)); |
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