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e1000e: Implement system clock

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The system clock is necessary to implement PTP features. While we are
not implementing PTP features for e1000e yet, we do have a plan to
implement them for igb, a new network device derived from e1000e,
so add system clock to the common base first.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Akihiko Odaki 2023-02-23 19:20:18 +09:00 • committed by Jason Wang
parent 69ff5ef847
commit 5fb7d14995
7 changed files with 103 additions and 5 deletions
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25
hw/net/e1000x_common.c
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@ -267,3 +267,28 @@ e1000x_read_tx_ctx_descr(struct e1000_context_desc *d,
props->tcp = (op & E1000_TXD_CMD_TCP) ? 1 : 0;
props->tse = (op & E1000_TXD_CMD_TSE) ? 1 : 0;
}
void e1000x_timestamp(uint32_t *mac, int64_t timadj, size_t lo, size_t hi)
{
int64_t ns = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
uint32_t timinca = mac[TIMINCA];
uint32_t incvalue = timinca & E1000_TIMINCA_INCVALUE_MASK;
uint32_t incperiod = MAX(timinca >> E1000_TIMINCA_INCPERIOD_SHIFT, 1);
int64_t timestamp = timadj + muldiv64(ns, incvalue, incperiod * 16);
mac[lo] = timestamp & 0xffffffff;
mac[hi] = timestamp >> 32;
}
void e1000x_set_timinca(uint32_t *mac, int64_t *timadj, uint32_t val)
{
int64_t ns = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
uint32_t old_val = mac[TIMINCA];
uint32_t old_incvalue = old_val & E1000_TIMINCA_INCVALUE_MASK;
uint32_t old_incperiod = MAX(old_val >> E1000_TIMINCA_INCPERIOD_SHIFT, 1);
uint32_t incvalue = val & E1000_TIMINCA_INCVALUE_MASK;
uint32_t incperiod = MAX(val >> E1000_TIMINCA_INCPERIOD_SHIFT, 1);
mac[TIMINCA] = val;
*timadj += (muldiv64(ns, incvalue, incperiod) - muldiv64(ns, old_incvalue, old_incperiod)) / 16;
}