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if_ffec: Fix cache handling on tx

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With the previous fix, it could happen that the end of the packet hasn't
been flushed. For example assume the following addresses:

ds_addr: 0x81c804A
ds_len: 0x57

In that case the data ends at 0x81c80a1. But due to the rounding the
area from 0x81c8040 to 0x81c80a0 would have been flushed.

This fix now first calculates the start and end address, aligns these
addresses and then recalculates the len that has to be flushed.

Update #4180
This commit is contained in:
Christian Mauderer 2020-11-06 09:53:05 +01:00
parent 9cd28904cf
commit a58f553e9d
1 changed files with 6 additions and 5 deletions
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11
freebsd/sys/dev/ffec/if_ffec.c
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@ -714,15 +714,16 @@ ffec_encap(struct ifnet *ifp, struct ffec_softc *sc, struct mbuf *m0,
tx_desc->buf_paddr = segs[i].ds_addr;
tx_desc->flags2 = flags2;
#ifdef __rtems__
uintptr_t addr_flush = (uintptr_t)segs[i].ds_addr;
uintptr_t first_flush = (uintptr_t)segs[i].ds_addr;
size_t len_flush = segs[i].ds_len;
#ifdef CPU_CACHE_LINE_BYTES
uintptr_t last_flush = first_flush + len_flush;
/* mbufs should be cache line aligned. So we can just round. */
addr_flush = addr_flush & ~(CPU_CACHE_LINE_BYTES - 1);
len_flush = (len_flush + (CPU_CACHE_LINE_BYTES - 1)) &
~(CPU_CACHE_LINE_BYTES - 1);
first_flush = rounddown2(first_flush, CPU_CACHE_LINE_BYTES);
last_flush = roundup2(last_flush, CPU_CACHE_LINE_BYTES);
len_flush = last_flush - first_flush;
#endif
rtems_cache_flush_multiple_data_lines((void*)addr_flush,
rtems_cache_flush_multiple_data_lines((void*)first_flush,
len_flush);
#endif /* __rtems__ */