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RE: [PATCH] net/imx_fec: Updating the IMX_FEC IP to support loopback mod
From: |
Wasim, Bilal |
Subject: |
RE: [PATCH] net/imx_fec: Updating the IMX_FEC IP to support loopback mode. |
Date: |
Fri, 29 Nov 2019 15:59:00 +0000 |
Thanks for the pointers philippe.. Is the patch okay to be merged without it or
do I need to do a re-submission with the updated username ?
- Bilal
-----Original Message-----
From: Philippe Mathieu-Daudé [mailto:address@hidden]
Sent: Friday, November 29, 2019 8:38 PM
To: address@hidden; address@hidden
Cc: address@hidden; address@hidden; address@hidden; address@hidden; Wasim,
Bilal <address@hidden>; address@hidden; Jason Wang <address@hidden>
Subject: Re: [PATCH] net/imx_fec: Updating the IMX_FEC IP to support loopback
mode.
Hi Bilal,
Cc'ing Jason, the maintainer of network devices.
On 11/29/19 4:05 PM, address@hidden wrote:
> From: bwasim <address@hidden>
Your git setup misses your 'user.name', you could fix it running:
git config user.name "Bilal Wasim"
(eventually with the --global option).
The patch looks good otherwise.
Thanks!
> Loopback mode only works when specific conditions (as dictated by the
> IP guide) are met, i.e. the MII_MODE is set and the RMII_MODE is
> cleared. If not, we simply send the packet on the output queue (for TX
> to the host network). Tested by running a custom RTOS and TXing a ton
> of packets. The same packets were received on the RX side..
>
> Signed-off-by: Bilal Wasim <address@hidden>
> ---
> hw/net/imx_fec.c | 27 +++++++++++++++++++++++++--
> 1 file changed, 25 insertions(+), 2 deletions(-)
>
> diff --git a/hw/net/imx_fec.c b/hw/net/imx_fec.c index
> bd99236864..c51e7f7363 100644
> --- a/hw/net/imx_fec.c
> +++ b/hw/net/imx_fec.c
> @@ -256,6 +256,29 @@ static const VMStateDescription vmstate_imx_eth =
> {
>
> static void imx_eth_update(IMXFECState *s);
>
> +/*
> + * Function to check if the MAC is configured to run in loopback mode.
> + * If so, invoke the "receive" routine.
> + * Else write to the output.
> + * */
> +static void send_pkt(IMXFECState *s, uint8_t *frame, int frame_size)
> +{
> + NetClientState *nc = qemu_get_queue(s->nic);
> +
> + /*
> + * Loopback or Normal mode ?
> + * Per the FEC Manual: If loopback is enabled, the MII_MODE
> + * should be SET and the RMII_MODE should be cleared. Loopback
> + * will only work if this criterion is met. If not met,
> + * we will send the frame on the output queue. */
> + if ((s->regs[ENET_RCR] & ENET_RCR_LOOP) && (s->regs[ENET_RCR] &
> ENET_RCR_MII_MODE)
> + && !(s->regs[ENET_RCR] & ENET_RCR_RMII_MODE)) {
> + nc->info->receive(nc, frame, frame_size);
> + } else {
> + qemu_send_packet(nc, frame, frame_size);
> + }
> +}
> +
> /*
> * The MII phy could raise a GPIO to the processor which in turn
> * could be handled as an interrpt by the OS.
> @@ -488,7 +511,7 @@ static void imx_fec_do_tx(IMXFECState *s)
> frame_size += len;
> if (bd.flags & ENET_BD_L) {
> /* Last buffer in frame. */
> - qemu_send_packet(qemu_get_queue(s->nic), s->frame, frame_size);
> + send_pkt(s, (uint8_t *)&s->frame, frame_size);
> ptr = s->frame;
> frame_size = 0;
> s->regs[ENET_EIR] |= ENET_INT_TXF; @@ -586,7 +609,7 @@
> static void imx_enet_do_tx(IMXFECState *s, uint32_t index)
> }
> /* Last buffer in frame. */
>
> - qemu_send_packet(qemu_get_queue(s->nic), s->frame, frame_size);
> + send_pkt(s, (uint8_t *)&s->frame, frame_size);
> ptr = s->frame;
>
> frame_size = 0;
>