> Subject: Re: [Patch v6 01/18] net/mana: add basic driver, build environment
> and
> doc
>
> On 2022/8/31 6:51, lon...@linuxonhyperv.com wrote:
> > From: Long Li <lon...@microsoft.com>
> >
> > MANA is a PCI device. It uses IB verbs to access hardware through the
> > kernel RDMA layer. This patch introduces build environment and basic
> > device probe functions.
> >
> > Signed-off-by: Long Li <lon...@microsoft.com>
>
> ...
>
> > +static int mana_mp_primary_handle(const struct rte_mp_msg *mp_msg,
> > + const void *peer)
> > +{
> > + struct rte_eth_dev *dev;
> > + const struct mana_mp_param *param =
> > + (const struct mana_mp_param *)mp_msg->param;
> > + struct rte_mp_msg mp_res = { 0 };
> > + struct mana_mp_param *res = (struct mana_mp_param
> *)mp_res.param;
> > + int ret;
> > + struct mana_priv *priv;
> > +
> > + if (!rte_eth_dev_is_valid_port(param->port_id)) {
> > + DRV_LOG(ERR, "MP handle port ID %u invalid", param->port_id);
> > + return -ENODEV;
> > + }
> > +
> > + dev = &rte_eth_devices[param->port_id];
> > + priv = dev->data->dev_private;
> > +
> > + mp_init_msg(&mp_res, param->type, param->port_id);
> > +
> > + switch (param->type) {
> > + case MANA_MP_REQ_VERBS_CMD_FD:
> > + mp_res.num_fds = 1;
> > + mp_res.fds[0] = priv->ib_ctx->cmd_fd;
>
> The cmd_fd is system level handler?
>
> If it's process private handler, it should not used directly in another
> process.
According to rte_mp_xxx semantics, the file handle is duplicated to another
process. It's not directly used. It's required for secondary process to map to
the same doorbell pages.
>
> > + res->result = 0;
> > + ret = rte_mp_reply(&mp_res, peer);
> > + break;
> > +
> > + default:
> > + DRV_LOG(ERR, "Port %u unknown primary MP type %u",
> > + param->port_id, param->type);
> > + ret = -EINVAL;
> > + }
> > +
> > + return ret;
> > +}
> > +
