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hw/net/allwinner-sun8i-emac: Correctly byteswap descriptor fields

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In allwinner-sun8i-emac we just read directly from guest memory into
a host FrameDescriptor struct and back.  This only works on
little-endian hosts.  Reading and writing of descriptors is already
abstracted into functions; make those functions also handle the
byte-swapping so that TransferDescriptor structs as seen by the rest
of the code are always in host-order, and fix two places that were
doing ad-hoc descriptor reading without using the functions.

Cc: qemu-stable@nongnu.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20230424165053.1428857-3-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2023-04-24 17:50:53 +01:00
parent 3e20d90824
commit a4ae17e5ec
1 changed files with 15 additions and 7 deletions
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22
hw/net/allwinner-sun8i-emac.c
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@ -350,8 +350,13 @@ static void allwinner_sun8i_emac_get_desc(AwSun8iEmacState *s,
FrameDescriptor *desc,
uint32_t phys_addr)
{
dma_memory_read(&s->dma_as, phys_addr, desc, sizeof(*desc),
uint32_t desc_words[4];
dma_memory_read(&s->dma_as, phys_addr, &desc_words, sizeof(desc_words),
MEMTXATTRS_UNSPECIFIED);
desc->status = le32_to_cpu(desc_words[0]);
desc->status2 = le32_to_cpu(desc_words[1]);
desc->addr = le32_to_cpu(desc_words[2]);
desc->next = le32_to_cpu(desc_words[3]);
}
static uint32_t allwinner_sun8i_emac_next_desc(AwSun8iEmacState *s,
@ -400,10 +405,15 @@ static uint32_t allwinner_sun8i_emac_tx_desc(AwSun8iEmacState *s,
}
static void allwinner_sun8i_emac_flush_desc(AwSun8iEmacState *s,
FrameDescriptor *desc,
const FrameDescriptor *desc,
uint32_t phys_addr)
{
dma_memory_write(&s->dma_as, phys_addr, desc, sizeof(*desc),
uint32_t desc_words[4];
desc_words[0] = cpu_to_le32(desc->status);
desc_words[1] = cpu_to_le32(desc->status2);
desc_words[2] = cpu_to_le32(desc->addr);
desc_words[3] = cpu_to_le32(desc->next);
dma_memory_write(&s->dma_as, phys_addr, &desc_words, sizeof(desc_words),
MEMTXATTRS_UNSPECIFIED);
}
@ -638,8 +648,7 @@ static uint64_t allwinner_sun8i_emac_read(void *opaque, hwaddr offset,
break;
case REG_TX_CUR_BUF: /* Transmit Current Buffer */
if (s->tx_desc_curr != 0) {
dma_memory_read(&s->dma_as, s->tx_desc_curr, &desc, sizeof(desc),
MEMTXATTRS_UNSPECIFIED);
allwinner_sun8i_emac_get_desc(s, &desc, s->tx_desc_curr);
value = desc.addr;
} else {
value = 0;
@ -652,8 +661,7 @@ static uint64_t allwinner_sun8i_emac_read(void *opaque, hwaddr offset,
break;
case REG_RX_CUR_BUF: /* Receive Current Buffer */
if (s->rx_desc_curr != 0) {
dma_memory_read(&s->dma_as, s->rx_desc_curr, &desc, sizeof(desc),
MEMTXATTRS_UNSPECIFIED);
allwinner_sun8i_emac_get_desc(s, &desc, s->rx_desc_curr);
value = desc.addr;
} else {
value = 0;