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| author | Finn Thain <fthain@telegraphics.com.au> | 2020-01-29 20:27:49 +1100 |
|---|---|---|
| committer | Jason Wang <jasowang@redhat.com> | 2020-03-03 18:04:47 +0800 |
| commit | 5b0c98fcb7ac006bd8efe0e0fecba52c43a9d028 (patch) | |
| tree | b31218dece009cd7282b9987e2f01c72895c663d | |
| parent | 9e3cd456d85ad45e72bdba99203302342ce29b3b (diff) | |
| download | qemu-5b0c98fcb7ac006bd8efe0e0fecba52c43a9d028.zip qemu-5b0c98fcb7ac006bd8efe0e0fecba52c43a9d028.tar.gz qemu-5b0c98fcb7ac006bd8efe0e0fecba52c43a9d028.tar.bz2 | |
dp8393x: Update LLFA and CRDA registers from rx descriptor
Follow the algorithm given in the National Semiconductor DP83932C
datasheet in section 3.4.7:
At the next reception, the SONIC re-reads the last RXpkt.link field,
and updates its CRDA register to point to the next descriptor.
The chip is designed to allow the host to provide a new list of
descriptors in this way.
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Tested-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
| -rw-r--r-- | hw/net/dp8393x.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/hw/net/dp8393x.c b/hw/net/dp8393x.c index ed57f5f..9604623 100644 --- a/hw/net/dp8393x.c +++ b/hw/net/dp8393x.c @@ -786,12 +786,13 @@ static ssize_t dp8393x_receive(NetClientState *nc, const uint8_t * buf, address = dp8393x_crda(s) + sizeof(uint16_t) * 5 * width; address_space_read(&s->as, address, MEMTXATTRS_UNSPECIFIED, s->data, size); - if (dp8393x_get(s, width, 0) & SONIC_DESC_EOL) { + s->regs[SONIC_LLFA] = dp8393x_get(s, width, 0); + if (s->regs[SONIC_LLFA] & SONIC_DESC_EOL) { /* Still EOL ; stop reception */ return -1; - } else { - s->regs[SONIC_CRDA] = s->regs[SONIC_LLFA]; } + /* Link has been updated by host */ + s->regs[SONIC_CRDA] = s->regs[SONIC_LLFA]; } /* Save current position */ @@ -840,7 +841,7 @@ static ssize_t dp8393x_receive(NetClientState *nc, const uint8_t * buf, MEMTXATTRS_UNSPECIFIED, s->data, size); - /* Move to next descriptor */ + /* Check link field */ size = sizeof(uint16_t) * width; address_space_read(&s->as, dp8393x_crda(s) + sizeof(uint16_t) * 5 * width, @@ -856,6 +857,8 @@ static ssize_t dp8393x_receive(NetClientState *nc, const uint8_t * buf, dp8393x_put(s, width, 0, 0); address_space_write(&s->as, address, MEMTXATTRS_UNSPECIFIED, s->data, size); + + /* Move to next descriptor */ s->regs[SONIC_CRDA] = s->regs[SONIC_LLFA]; s->regs[SONIC_ISR] |= SONIC_ISR_PKTRX; s->regs[SONIC_RSC] = (s->regs[SONIC_RSC] & 0xff00) | (((s->regs[SONIC_RSC] & 0x00ff) + 1) & 0x00ff); |