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Message-ID: <fc421c38-66b7-4d4e-abfa-051eccbf793c@linux.dev>
Date: Wed, 24 Jan 2024 10:10:46 +0000
From: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
To: Herve Codina <herve.codina@...tlin.com>,
"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
linuxppc-dev@...ts.ozlabs.org, Andrew Lunn <andrew@...n.ch>,
Mark Brown <broonie@...nel.org>,
Christophe Leroy <christophe.leroy@...roup.eu>,
Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 3/4] net: wan: fsl_qmc_hdlc: Add runtime timeslots changes
support
On 23/01/2024 16:49, Herve Codina wrote:
> QMC channels support runtime timeslots changes but nothing is done at
> the QMC HDLC driver to handle these changes.
>
> Use existing IFACE ioctl in order to configure the timeslots to use.
>
> Signed-off-by: Herve Codina <herve.codina@...tlin.com>
> Reviewed-by: Christophe Leroy <christophe.leroy@...roup.eu>
> Acked-by: Jakub Kicinski <kuba@...nel.org>
> ---
> drivers/net/wan/fsl_qmc_hdlc.c | 169 ++++++++++++++++++++++++++++++++-
> 1 file changed, 168 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/wan/fsl_qmc_hdlc.c b/drivers/net/wan/fsl_qmc_hdlc.c
> index 31b637ec8390..82019cd96365 100644
> --- a/drivers/net/wan/fsl_qmc_hdlc.c
> +++ b/drivers/net/wan/fsl_qmc_hdlc.c
> @@ -32,6 +32,7 @@ struct qmc_hdlc {
> struct qmc_hdlc_desc tx_descs[8];
> unsigned int tx_out;
> struct qmc_hdlc_desc rx_descs[4];
> + u32 slot_map;
> };
>
> static inline struct qmc_hdlc *netdev_to_qmc_hdlc(struct net_device *netdev)
> @@ -202,6 +203,162 @@ static netdev_tx_t qmc_hdlc_xmit(struct sk_buff *skb, struct net_device *netdev)
> return NETDEV_TX_OK;
> }
>
> +static int qmc_hdlc_xlate_slot_map(struct qmc_hdlc *qmc_hdlc,
> + u32 slot_map, struct qmc_chan_ts_info *ts_info)
> +{
> + u64 ts_mask_avail;
> + unsigned int bit;
> + unsigned int i;
> + u64 ts_mask;
> + u64 map;
> +
> + /* Tx and Rx masks must be identical */
> + if (ts_info->rx_ts_mask_avail != ts_info->tx_ts_mask_avail) {
> + dev_err(qmc_hdlc->dev, "tx and rx available timeslots mismatch (0x%llx, 0x%llx)\n",
> + ts_info->rx_ts_mask_avail, ts_info->tx_ts_mask_avail);
> + return -EINVAL;
> + }
> +
> + ts_mask_avail = ts_info->rx_ts_mask_avail;
> + ts_mask = 0;
> + map = slot_map;
> + bit = 0;
> + for (i = 0; i < 64; i++) {
> + if (ts_mask_avail & BIT_ULL(i)) {
> + if (map & BIT_ULL(bit))
> + ts_mask |= BIT_ULL(i);
> + bit++;
> + }
> + }
> +
> + if (hweight64(ts_mask) != hweight64(map)) {
> + dev_err(qmc_hdlc->dev, "Cannot translate timeslots 0x%llx -> (0x%llx,0x%llx)\n",
> + map, ts_mask_avail, ts_mask);
> + return -EINVAL;
> + }
> +
> + ts_info->tx_ts_mask = ts_mask;
> + ts_info->rx_ts_mask = ts_mask;
> + return 0;
> +}
> +
> +static int qmc_hdlc_xlate_ts_info(struct qmc_hdlc *qmc_hdlc,
> + const struct qmc_chan_ts_info *ts_info, u32 *slot_map)
> +{
> + u64 ts_mask_avail;
> + unsigned int bit;
> + unsigned int i;
> + u64 ts_mask;
> + u64 map;
> +
Starting from here ...
> + /* Tx and Rx masks must be identical */
> + if (ts_info->rx_ts_mask_avail != ts_info->tx_ts_mask_avail) {
> + dev_err(qmc_hdlc->dev, "tx and rx available timeslots mismatch (0x%llx, 0x%llx)\n",
> + ts_info->rx_ts_mask_avail, ts_info->tx_ts_mask_avail);
> + return -EINVAL;
> + }
> + if (ts_info->rx_ts_mask != ts_info->tx_ts_mask) {
> + dev_err(qmc_hdlc->dev, "tx and rx timeslots mismatch (0x%llx, 0x%llx)\n",
> + ts_info->rx_ts_mask, ts_info->tx_ts_mask);
> + return -EINVAL;
> + }
> +
> + ts_mask_avail = ts_info->rx_ts_mask_avail;
> + ts_mask = ts_info->rx_ts_mask;
> + map = 0;
> + bit = 0;
> + for (i = 0; i < 64; i++) {
> + if (ts_mask_avail & BIT_ULL(i)) {
> + if (ts_mask & BIT_ULL(i))
> + map |= BIT_ULL(bit);
> + bit++;
> + }
> + }
> +
> + if (hweight64(ts_mask) != hweight64(map)) {
> + dev_err(qmc_hdlc->dev, "Cannot translate timeslots (0x%llx,0x%llx) -> 0x%llx\n",
> + ts_mask_avail, ts_mask, map);
> + return -EINVAL;
> + }
> +
till here the block looks like copy of the block from previous function.
It worth to make a separate function for it, I think.
> + if (map >= BIT_ULL(32)) {
> + dev_err(qmc_hdlc->dev, "Slot map out of 32bit (0x%llx,0x%llx) -> 0x%llx\n",
> + ts_mask_avail, ts_mask, map);
> + return -EINVAL;
> + }
> +
> + *slot_map = map;
> + return 0;
> +}
> +
> +static int qmc_hdlc_set_iface(struct qmc_hdlc *qmc_hdlc, int if_iface, const te1_settings *te1)
> +{
> + struct qmc_chan_ts_info ts_info;
> + int ret;
> +
> + ret = qmc_chan_get_ts_info(qmc_hdlc->qmc_chan, &ts_info);
> + if (ret) {
> + dev_err(qmc_hdlc->dev, "get QMC channel ts info failed %d\n", ret);
> + return ret;
> + }
> + ret = qmc_hdlc_xlate_slot_map(qmc_hdlc, te1->slot_map, &ts_info);
> + if (ret)
> + return ret;
> +
> + ret = qmc_chan_set_ts_info(qmc_hdlc->qmc_chan, &ts_info);
> + if (ret) {
> + dev_err(qmc_hdlc->dev, "set QMC channel ts info failed %d\n", ret);
> + return ret;
> + }
> +
> + qmc_hdlc->slot_map = te1->slot_map;
> +
> + return 0;
> +}
> +
> +static int qmc_hdlc_ioctl(struct net_device *netdev, struct if_settings *ifs)
> +{
> + struct qmc_hdlc *qmc_hdlc = netdev_to_qmc_hdlc(netdev);
> + te1_settings te1;
> +
> + switch (ifs->type) {
> + case IF_GET_IFACE:
> + ifs->type = IF_IFACE_E1;
> + if (ifs->size < sizeof(te1)) {
> + if (!ifs->size)
> + return 0; /* only type requested */
> +
> + ifs->size = sizeof(te1); /* data size wanted */
> + return -ENOBUFS;
> + }
> +
> + memset(&te1, 0, sizeof(te1));
> +
> + /* Update slot_map */
> + te1.slot_map = qmc_hdlc->slot_map;
> +
> + if (copy_to_user(ifs->ifs_ifsu.te1, &te1, sizeof(te1)))
> + return -EFAULT;
> + return 0;
> +
> + case IF_IFACE_E1:
> + case IF_IFACE_T1:
> + if (!capable(CAP_NET_ADMIN))
> + return -EPERM;
> +
> + if (netdev->flags & IFF_UP)
> + return -EBUSY;
> +
> + if (copy_from_user(&te1, ifs->ifs_ifsu.te1, sizeof(te1)))
> + return -EFAULT;
> +
> + return qmc_hdlc_set_iface(qmc_hdlc, ifs->type, &te1);
> +
> + default:
> + return hdlc_ioctl(netdev, ifs);
> + }
> +}
> +
> static int qmc_hdlc_open(struct net_device *netdev)
> {
> struct qmc_hdlc *qmc_hdlc = netdev_to_qmc_hdlc(netdev);
> @@ -328,13 +485,14 @@ static const struct net_device_ops qmc_hdlc_netdev_ops = {
> .ndo_open = qmc_hdlc_open,
> .ndo_stop = qmc_hdlc_close,
> .ndo_start_xmit = hdlc_start_xmit,
> - .ndo_siocwandev = hdlc_ioctl,
> + .ndo_siocwandev = qmc_hdlc_ioctl,
> };
>
> static int qmc_hdlc_probe(struct platform_device *pdev)
> {
> struct device_node *np = pdev->dev.of_node;
> struct qmc_hdlc *qmc_hdlc;
> + struct qmc_chan_ts_info ts_info;
> struct qmc_chan_info info;
> hdlc_device *hdlc;
> int ret;
> @@ -364,6 +522,15 @@ static int qmc_hdlc_probe(struct platform_device *pdev)
> return -EINVAL;
> }
>
> + ret = qmc_chan_get_ts_info(qmc_hdlc->qmc_chan, &ts_info);
> + if (ret) {
> + dev_err(qmc_hdlc->dev, "get QMC channel ts info failed %d\n", ret);
> + return ret;
> + }
> + ret = qmc_hdlc_xlate_ts_info(qmc_hdlc, &ts_info, &qmc_hdlc->slot_map);
> + if (ret)
> + return ret;
> +
> qmc_hdlc->netdev = alloc_hdlcdev(qmc_hdlc);
> if (!qmc_hdlc->netdev) {
> dev_err(qmc_hdlc->dev, "failed to alloc hdlc dev\n");
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