diff options
author | Peter Maydell <peter.maydell@linaro.org> | 2023-04-24 17:50:53 +0100 |
---|---|---|
committer | Michael Tokarev <mjt@tls.msk.ru> | 2023-05-18 21:09:59 +0300 |
commit | ec979ff52c1026a85595062c5e03a31a6f2fb786 (patch) | |
tree | 9c5fc5d8a610d5008f87faaf4fb94f9ec2aa4f4c /hw/net | |
parent | 4b02ac725a5e65a838c8a21be54d6325365b5e1f (diff) |
hw/net/allwinner-sun8i-emac: Correctly byteswap descriptor fields
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
(cherry picked from commit a4ae17e5ec512862bf73e40dfbb1e7db71f2c1e7)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Diffstat (limited to 'hw/net')
-rw-r--r-- | hw/net/allwinner-sun8i-emac.c | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/hw/net/allwinner-sun8i-emac.c b/hw/net/allwinner-sun8i-emac.c index ecc0245fe8..c3fed5fcbe 100644 --- a/hw/net/allwinner-sun8i-emac.c +++ b/hw/net/allwinner-sun8i-emac.c @@ -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; |