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hw/net/lan9118: Signal TSFL_INT flag when TX FIFO reaches specified level

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The LAN9118 allows the guest to specify a level for both the TX and
RX FIFOs at which an interrupt will be generated.  We implement the
RSFL_INT interrupt for the RX FIFO but are missing the handling of
the equivalent TSFL_INT for the TX FIFO.  Add the missing test to set
the interrupt if the TX FIFO has exceeded the guest-specified level.

This flag is required for Micrium lan911x ethernet driver to work.

Signed-off-by: Lucas Dietrich <ld.adecy@gmail.com>
[PMM: Tweaked commit message and comment]
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Lucas Dietrich 2022-08-29 22:00:46 +02:00 committed by Peter Maydell
parent d4424bebce
commit 895a803ce9
1 changed files with 8 additions and 0 deletions
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8
hw/net/lan9118.c
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@ -696,6 +696,14 @@ static void do_tx_packet(lan9118_state *s)
n = (s->tx_status_fifo_head + s->tx_status_fifo_used) & 511;
s->tx_status_fifo[n] = status;
s->tx_status_fifo_used++;
/*
* Generate TSFL interrupt if TX FIFO level exceeds the level
* specified in the FIFO_INT TX Status Level field.
*/
if (s->tx_status_fifo_used > ((s->fifo_int >> 16) & 0xff)) {
s->int_sts |= TSFL_INT;
}
if (s->tx_status_fifo_used == 512) {
s->int_sts |= TSFF_INT;
/* TODO: Stop transmission. */