[PATCH net] net/ncsi: Extend NC-SI Netlink interface to allow user space to send NC-SI command
Justin.Lee1 at Dell.com
Justin.Lee1 at Dell.com
Sat Sep 29 02:06:46 AEST 2018
Hi Samuel,
Please see my comment below.
Thanks,
Justin
> On Thu, 2018-09-27 at 21:08 +0000, Justin.Lee1 at Dell.com wrote:
> > The new command (NCSI_CMD_SEND_CMD) is added to allow user space application
> > to send NC-SI command to the network card.
> > Also, add a new attribute (NCSI_ATTR_DATA) for transferring request and response.
> >
> > The work flow is as below.
> >
> > Request:
> > User space application -> Netlink interface (msg)
> > -> new Netlink handler - ncsi_send_cmd_nl()
> > -> ncsi_xmit_cmd()
> > Response:
> > Response received - ncsi_rcv_rsp() -> internal response handler - ncsi_rsp_handler_xxx()
> > -> ncsi_rsp_handler_netlink()
> > -> ncsi_send_netlink_rsp ()
> > -> Netlink interface (msg)
> > -> user space application
> > Command timeout - ncsi_request_timeout() -> ncsi_send_netlink_timeout ()
> > -> Netlink interface (msg with zero data length)
> > -> user space application
> > Error:
> > Error detected -> ncsi_send_netlink_err () -> Netlink interface (err msg)
> > -> user space application
> >
> >
> > Signed-off-by: Justin Lee <justin.lee1 at dell.com>
> >
>
> Hi Justin,
>
> Thanks for posting this on the list! The overall design looks good and so
> far looks like it should fit relatively well with the other OEM command
> patch. I'll try and run some OEM commands against my machine.
> Some comments below:
>
> >
> > ---
> > include/uapi/linux/ncsi.h | 3 +
> > net/ncsi/internal.h | 12 ++-
> > net/ncsi/ncsi-aen.c | 10 ++-
> > net/ncsi/ncsi-cmd.c | 106 ++++++++++++++++--------
> > net/ncsi/ncsi-manage.c | 74 ++++++++++++++---
> > net/ncsi/ncsi-netlink.c | 199 +++++++++++++++++++++++++++++++++++++++++++++-
> > net/ncsi/ncsi-netlink.h | 4 +
> > net/ncsi/ncsi-rsp.c | 70 ++++++++++++++--
> > 8 files changed, 420 insertions(+), 58 deletions(-)
> >
> > diff --git a/include/uapi/linux/ncsi.h b/include/uapi/linux/ncsi.h
> > index 4c292ec..4992bfc 100644
> > --- a/include/uapi/linux/ncsi.h
> > +++ b/include/uapi/linux/ncsi.h
> > @@ -30,6 +30,7 @@ enum ncsi_nl_commands {
> > NCSI_CMD_PKG_INFO,
> > NCSI_CMD_SET_INTERFACE,
> > NCSI_CMD_CLEAR_INTERFACE,
> > + NCSI_CMD_SEND_CMD,
> >
> > __NCSI_CMD_AFTER_LAST,
> > NCSI_CMD_MAX = __NCSI_CMD_AFTER_LAST - 1
> > @@ -43,6 +44,7 @@ enum ncsi_nl_commands {
> > * @NCSI_ATTR_PACKAGE_LIST: nested array of NCSI_PKG_ATTR attributes
> > * @NCSI_ATTR_PACKAGE_ID: package ID
> > * @NCSI_ATTR_CHANNEL_ID: channel ID
> > + * @NCSI_ATTR_DATA: command payload
> > * @NCSI_ATTR_MAX: highest attribute number
> > */
> > enum ncsi_nl_attrs {
> > @@ -51,6 +53,7 @@ enum ncsi_nl_attrs {
> > NCSI_ATTR_PACKAGE_LIST,
> > NCSI_ATTR_PACKAGE_ID,
> > NCSI_ATTR_CHANNEL_ID,
> > + NCSI_ATTR_DATA,
> >
> > __NCSI_ATTR_AFTER_LAST,
> > NCSI_ATTR_MAX = __NCSI_ATTR_AFTER_LAST - 1
> > diff --git a/net/ncsi/internal.h b/net/ncsi/internal.h
> > index 8055e39..20ce735 100644
> > --- a/net/ncsi/internal.h
> > +++ b/net/ncsi/internal.h
> > @@ -215,12 +215,17 @@ struct ncsi_request {
> > unsigned char id; /* Request ID - 0 to 255 */
> > bool used; /* Request that has been assigned */
> > unsigned int flags; /* NCSI request property */
> > -#define NCSI_REQ_FLAG_EVENT_DRIVEN 1
> > +#define NCSI_REQ_FLAG_EVENT_DRIVEN 1
> > +#define NCSI_REQ_FLAG_NETLINK_DRIVEN 2
> > struct ncsi_dev_priv *ndp; /* Associated NCSI device */
> > struct sk_buff *cmd; /* Associated NCSI command packet */
> > struct sk_buff *rsp; /* Associated NCSI response packet */
> > struct timer_list timer; /* Timer on waiting for response */
> > bool enabled; /* Time has been enabled or not */
> > +
> > + u32 snd_seq; /* netlink sending sequence number */
> > + u32 snd_portid; /* netlink portid of sender */
> > + struct nlmsghdr nlhdr; /* netlink message header */
> > };
> >
> > enum {
> > @@ -301,10 +306,13 @@ struct ncsi_cmd_arg {
> > unsigned short payload; /* Command packet payload length */
> > unsigned int req_flags; /* NCSI request properties */
> > union {
> > - unsigned char bytes[16]; /* Command packet specific data */
> > + unsigned char bytes[16]; /* Command packet specific data */
> > unsigned short words[8];
> > unsigned int dwords[4];
> > };
> > +
> > + unsigned char *data; /* Netlink data */
> > + struct genl_info *info; /* Netlink information */
> > };
> >
> > extern struct list_head ncsi_dev_list;
> > diff --git a/net/ncsi/ncsi-aen.c b/net/ncsi/ncsi-aen.c
> > index 25e483e..b5ec193 100644
> > --- a/net/ncsi/ncsi-aen.c
> > +++ b/net/ncsi/ncsi-aen.c
> > @@ -16,6 +16,7 @@
> > #include <net/ncsi.h>
> > #include <net/net_namespace.h>
> > #include <net/sock.h>
> > +#include <net/genetlink.h>
> >
> > #include "internal.h"
> > #include "ncsi-pkt.h"
> > @@ -73,8 +74,8 @@ static int ncsi_aen_handler_lsc(struct ncsi_dev_priv *ndp,
> > ncm->data[2] = data;
> > ncm->data[4] = ntohl(lsc->oem_status);
> >
> > - netdev_dbg(ndp->ndev.dev, "NCSI: LSC AEN - channel %u state %s\n",
> > - nc->id, data & 0x1 ? "up" : "down");
> > + netdev_dbg(ndp->ndev.dev, "NCSI: LSC AEN - pkg %u ch %u state %s\n",
> > + nc->package->id, nc->id, data & 0x1 ? "up" : "down");
>
> There's a few places where you've changed or added some debug statements;
> these are good but could probably be in a separate patch since not all of
> them are related to the OEM command handling.
>
Sure, I will remove those.
> >
> > chained = !list_empty(&nc->link);
> > state = nc->state;
> > @@ -148,9 +149,10 @@ static int ncsi_aen_handler_hncdsc(struct ncsi_dev_priv *ndp,
> > hncdsc = (struct ncsi_aen_hncdsc_pkt *)h;
> > ncm->data[3] = ntohl(hncdsc->status);
> > spin_unlock_irqrestore(&nc->lock, flags);
> > +
> > netdev_dbg(ndp->ndev.dev,
> > - "NCSI: host driver %srunning on channel %u\n",
> > - ncm->data[3] & 0x1 ? "" : "not ", nc->id);
> > + "NCSI: host driver %srunning on pkg %u ch %u\n",
> > + ncm->data[3] & 0x1 ? "" : "not ", nc->package->id, nc->id);
> >
> > return 0;
> > }
> > diff --git a/net/ncsi/ncsi-cmd.c b/net/ncsi/ncsi-cmd.c
> > index 7567ca63..b291297 100644
> > --- a/net/ncsi/ncsi-cmd.c
> > +++ b/net/ncsi/ncsi-cmd.c
> > @@ -17,6 +17,7 @@
> > #include <net/ncsi.h>
> > #include <net/net_namespace.h>
> > #include <net/sock.h>
> > +#include <net/genetlink.h>
> >
> > #include "internal.h"
> > #include "ncsi-pkt.h"
> > @@ -211,42 +212,75 @@ static int ncsi_cmd_handler_snfc(struct sk_buff *skb,
> > return 0;
> > }
> >
> > +static int ncsi_cmd_handler_oem(struct sk_buff *skb,
> > + struct ncsi_cmd_arg *nca)
> > +{
> > + struct ncsi_cmd_pkt *cmd;
> > + unsigned char *dest, *source;
> > + unsigned short len;
> > +
> > + /* struct ncsi_cmd_pkt = minimum length
> > + * - frame checksum
> > + * - Ethernet header
> > + * = 64 - 4 - 14 = 46
> > + * minimum payload = 46 - ncsi header - ncsi checksum
> > + * = 46 - 16 - 4 = 26
> > + */
> > + len = nca->payload;
> > +
> > + /* minimum payload length is 26 bytes to meet minimum packet
> > + * length 64
> > + */
> > + if (len < 26)
> > + cmd = skb_put_zero(skb, sizeof(*cmd));
> > + else
> > + cmd = skb_put_zero(skb, len + sizeof(struct ncsi_pkt_hdr) + 4);
> > +
> > + dest = (unsigned char *)cmd + sizeof(struct ncsi_pkt_hdr);
> > + source = (unsigned char *)nca->data + sizeof(struct ncsi_pkt_hdr);
> > + memcpy(dest, source, len);
> > +
> > + ncsi_cmd_build_header(&cmd->cmd.common, nca);
> > +
> > + return 0;
> > +}
>
> This is quite similar to the other patch which is good, they shouldn't
> conflict much.
>
> > +
> > static struct ncsi_cmd_handler {
> > unsigned char type;
> > int payload;
> > int (*handler)(struct sk_buff *skb,
> > struct ncsi_cmd_arg *nca);
> > } ncsi_cmd_handlers[] = {
> > - { NCSI_PKT_CMD_CIS, 0, ncsi_cmd_handler_default },
> > - { NCSI_PKT_CMD_SP, 4, ncsi_cmd_handler_sp },
> > - { NCSI_PKT_CMD_DP, 0, ncsi_cmd_handler_default },
> > - { NCSI_PKT_CMD_EC, 0, ncsi_cmd_handler_default },
> > - { NCSI_PKT_CMD_DC, 4, ncsi_cmd_handler_dc },
> > - { NCSI_PKT_CMD_RC, 4, ncsi_cmd_handler_rc },
> > - { NCSI_PKT_CMD_ECNT, 0, ncsi_cmd_handler_default },
> > - { NCSI_PKT_CMD_DCNT, 0, ncsi_cmd_handler_default },
> > - { NCSI_PKT_CMD_AE, 8, ncsi_cmd_handler_ae },
> > - { NCSI_PKT_CMD_SL, 8, ncsi_cmd_handler_sl },
> > - { NCSI_PKT_CMD_GLS, 0, ncsi_cmd_handler_default },
> > - { NCSI_PKT_CMD_SVF, 8, ncsi_cmd_handler_svf },
> > - { NCSI_PKT_CMD_EV, 4, ncsi_cmd_handler_ev },
> > - { NCSI_PKT_CMD_DV, 0, ncsi_cmd_handler_default },
> > - { NCSI_PKT_CMD_SMA, 8, ncsi_cmd_handler_sma },
> > - { NCSI_PKT_CMD_EBF, 4, ncsi_cmd_handler_ebf },
> > - { NCSI_PKT_CMD_DBF, 0, ncsi_cmd_handler_default },
> > - { NCSI_PKT_CMD_EGMF, 4, ncsi_cmd_handler_egmf },
> > - { NCSI_PKT_CMD_DGMF, 0, ncsi_cmd_handler_default },
> > - { NCSI_PKT_CMD_SNFC, 4, ncsi_cmd_handler_snfc },
> > - { NCSI_PKT_CMD_GVI, 0, ncsi_cmd_handler_default },
> > - { NCSI_PKT_CMD_GC, 0, ncsi_cmd_handler_default },
> > - { NCSI_PKT_CMD_GP, 0, ncsi_cmd_handler_default },
> > - { NCSI_PKT_CMD_GCPS, 0, ncsi_cmd_handler_default },
> > - { NCSI_PKT_CMD_GNS, 0, ncsi_cmd_handler_default },
> > - { NCSI_PKT_CMD_GNPTS, 0, ncsi_cmd_handler_default },
> > - { NCSI_PKT_CMD_GPS, 0, ncsi_cmd_handler_default },
> > - { NCSI_PKT_CMD_OEM, 0, NULL },
> > - { NCSI_PKT_CMD_PLDM, 0, NULL },
> > - { NCSI_PKT_CMD_GPUUID, 0, ncsi_cmd_handler_default }
> > + { NCSI_PKT_CMD_CIS, 0, ncsi_cmd_handler_default },
> > + { NCSI_PKT_CMD_SP, 4, ncsi_cmd_handler_sp },
> > + { NCSI_PKT_CMD_DP, 0, ncsi_cmd_handler_default },
> > + { NCSI_PKT_CMD_EC, 0, ncsi_cmd_handler_default },
> > + { NCSI_PKT_CMD_DC, 4, ncsi_cmd_handler_dc },
> > + { NCSI_PKT_CMD_RC, 4, ncsi_cmd_handler_rc },
> > + { NCSI_PKT_CMD_ECNT, 0, ncsi_cmd_handler_default },
> > + { NCSI_PKT_CMD_DCNT, 0, ncsi_cmd_handler_default },
> > + { NCSI_PKT_CMD_AE, 8, ncsi_cmd_handler_ae },
> > + { NCSI_PKT_CMD_SL, 8, ncsi_cmd_handler_sl },
> > + { NCSI_PKT_CMD_GLS, 0, ncsi_cmd_handler_default },
> > + { NCSI_PKT_CMD_SVF, 8, ncsi_cmd_handler_svf },
> > + { NCSI_PKT_CMD_EV, 4, ncsi_cmd_handler_ev },
> > + { NCSI_PKT_CMD_DV, 0, ncsi_cmd_handler_default },
> > + { NCSI_PKT_CMD_SMA, 8, ncsi_cmd_handler_sma },
> > + { NCSI_PKT_CMD_EBF, 4, ncsi_cmd_handler_ebf },
> > + { NCSI_PKT_CMD_DBF, 0, ncsi_cmd_handler_default },
> > + { NCSI_PKT_CMD_EGMF, 4, ncsi_cmd_handler_egmf },
> > + { NCSI_PKT_CMD_DGMF, 0, ncsi_cmd_handler_default },
> > + { NCSI_PKT_CMD_SNFC, 4, ncsi_cmd_handler_snfc },
> > + { NCSI_PKT_CMD_GVI, 0, ncsi_cmd_handler_default },
> > + { NCSI_PKT_CMD_GC, 0, ncsi_cmd_handler_default },
> > + { NCSI_PKT_CMD_GP, 0, ncsi_cmd_handler_default },
> > + { NCSI_PKT_CMD_GCPS, 0, ncsi_cmd_handler_default },
> > + { NCSI_PKT_CMD_GNS, 0, ncsi_cmd_handler_default },
> > + { NCSI_PKT_CMD_GNPTS, 0, ncsi_cmd_handler_default },
> > + { NCSI_PKT_CMD_GPS, 0, ncsi_cmd_handler_default },
> > + { NCSI_PKT_CMD_OEM, -1, ncsi_cmd_handler_oem },
> > + { NCSI_PKT_CMD_PLDM, 0, NULL },
> > + { NCSI_PKT_CMD_GPUUID, 0, ncsi_cmd_handler_default }
> > };
>
> You've changed the whitespace here which has made the diff unnecessarily
> large; please just change the single _OEM line and keep the whitespace
> the same.
>
I will remove the whitespace for alignment.
> >
> > static struct ncsi_request *ncsi_alloc_command(struct ncsi_cmd_arg *nca)
> > @@ -317,11 +351,20 @@ int ncsi_xmit_cmd(struct ncsi_cmd_arg *nca)
> > }
> >
> > /* Get packet payload length and allocate the request */
> > - nca->payload = nch->payload;
> > + if (nch->payload >= 0)
> > + nca->payload = nch->payload;
> > +
> > nr = ncsi_alloc_command(nca);
> > if (!nr)
> > return -ENOMEM;
> >
> > + /* track netlink information */
> > + if (nca->req_flags == NCSI_REQ_FLAG_NETLINK_DRIVEN) {
> > + nr->snd_seq = nca->info->snd_seq;
> > + nr->snd_portid = nca->info->snd_portid;
> > + nr->nlhdr = *nca->info->nlhdr;
> > + }
> > +
> > /* Prepare the packet */
> > nca->id = nr->id;
> > ret = nch->handler(nr->cmd, nca);
> > @@ -341,6 +384,7 @@ int ncsi_xmit_cmd(struct ncsi_cmd_arg *nca)
> > * connection a 1 second delay should be sufficient.
> > */
> > nr->enabled = true;
> > +
> > mod_timer(&nr->timer, jiffies + 1 * HZ);
> >
> > /* Send NCSI packet */
> > diff --git a/net/ncsi/ncsi-manage.c b/net/ncsi/ncsi-manage.c
> > index 0912847..6629103 100644
> > --- a/net/ncsi/ncsi-manage.c
> > +++ b/net/ncsi/ncsi-manage.c
> > @@ -19,6 +19,7 @@
> > #include <net/addrconf.h>
> > #include <net/ipv6.h>
> > #include <net/if_inet6.h>
> > +#include <net/genetlink.h>
> >
> > #include "internal.h"
> > #include "ncsi-pkt.h"
> > @@ -110,8 +111,9 @@ static void ncsi_channel_monitor(struct timer_list *t)
> > case NCSI_CHANNEL_MONITOR_WAIT ... NCSI_CHANNEL_MONITOR_WAIT_MAX:
> > break;
> > default:
> > - netdev_err(ndp->ndev.dev, "NCSI Channel %d timed out!\n",
> > - nc->id);
> > + netdev_err(ndp->ndev.dev, "NCSI: pkg %u ch %u timed out!\n",
> > + np->id, nc->id);
> > +
> > if (!(ndp->flags & NCSI_DEV_HWA)) {
> > ncsi_report_link(ndp, true);
> > ndp->flags |= NCSI_DEV_RESHUFFLE;
> > @@ -143,6 +145,10 @@ void ncsi_start_channel_monitor(struct ncsi_channel *nc)
> > {
> > unsigned long flags;
> >
> > + netdev_dbg(nc->package->ndp->ndev.dev,
> > + "NCSI: %s pkg %u ch %u\n",
> > + __func__, nc->package->id, nc->id);
> > +
> > spin_lock_irqsave(&nc->lock, flags);
> > WARN_ON_ONCE(nc->monitor.enabled);
> > nc->monitor.enabled = true;
> > @@ -156,6 +162,10 @@ void ncsi_stop_channel_monitor(struct ncsi_channel *nc)
> > {
> > unsigned long flags;
> >
> > + netdev_dbg(nc->package->ndp->ndev.dev,
> > + "NCSI: %s pkg %u ch %u\n",
> > + __func__, nc->package->id, nc->id);
> > +
> > spin_lock_irqsave(&nc->lock, flags);
> > if (!nc->monitor.enabled) {
> > spin_unlock_irqrestore(&nc->lock, flags);
> > @@ -406,8 +416,13 @@ static void ncsi_request_timeout(struct timer_list *t)
> > {
> > struct ncsi_request *nr = from_timer(nr, t, timer);
> > struct ncsi_dev_priv *ndp = nr->ndp;
> > + struct ncsi_package *np;
> > + struct ncsi_channel *nc;
> > + struct ncsi_cmd_pkt *cmd;
> > unsigned long flags;
> >
> > + netdev_dbg(ndp->ndev.dev, "NCSI: %s\n", __func__);
> > +
> > /* If the request already had associated response,
> > * let the response handler to release it.
> > */
> > @@ -415,10 +430,23 @@ static void ncsi_request_timeout(struct timer_list *t)
> > nr->enabled = false;
> > if (nr->rsp || !nr->cmd) {
> > spin_unlock_irqrestore(&ndp->lock, flags);
> > +
> > + netdev_dbg(ndp->ndev.dev, "NCSI: %s - early return\n", __func__);
> > +
> > return;
> > }
> > spin_unlock_irqrestore(&ndp->lock, flags);
> >
> > + if (nr->flags == NCSI_REQ_FLAG_NETLINK_DRIVEN) {
> > + if (nr->cmd) {
> > + /* Find the package */
> > + cmd = (struct ncsi_cmd_pkt *)skb_network_header(nr->cmd);
> > + ncsi_find_package_and_channel(ndp, cmd->cmd.common.channel,
> > + &np, &nc);
> > + ncsi_send_netlink_timeout(nr, np, nc);
> > + }
> > + }
> > +
> > /* Release the request */
> > ncsi_free_request(nr);
> > }
> > @@ -432,6 +460,10 @@ static void ncsi_suspend_channel(struct ncsi_dev_priv *ndp)
> > unsigned long flags;
> > int ret;
> >
> > + netdev_dbg(ndp->ndev.dev,
> > + "NCSI: %s pkg %u ch %u state %04x\n",
> > + __func__, np->id, nc->id, nd->state);
> > +
> > nca.ndp = ndp;
> > nca.req_flags = NCSI_REQ_FLAG_EVENT_DRIVEN;
> > switch (nd->state) {
> > @@ -647,6 +679,10 @@ static void ncsi_configure_channel(struct ncsi_dev_priv *ndp)
> > unsigned long flags;
> > int ret;
> >
> > + netdev_dbg(ndp->ndev.dev,
> > + "NCSI: %s pkg %u ch %u state %04x\n",
> > + __func__, np->id, nc->id, nd->state);
> > +
> > nca.ndp = ndp;
> > nca.req_flags = NCSI_REQ_FLAG_EVENT_DRIVEN;
> > switch (nd->state) {
> > @@ -788,8 +824,9 @@ static void ncsi_configure_channel(struct ncsi_dev_priv *ndp)
> > }
> > break;
> > case ncsi_dev_state_config_done:
> > - netdev_dbg(ndp->ndev.dev, "NCSI: channel %u config done\n",
> > - nc->id);
> > + netdev_dbg(ndp->ndev.dev,
> > + "NCSI: pkg %u ch %u config done\n",
> > + nc->package->id, nc->id);
> > spin_lock_irqsave(&nc->lock, flags);
> > if (nc->reconfigure_needed) {
> > /* This channel's configuration has been updated
> > @@ -815,9 +852,10 @@ static void ncsi_configure_channel(struct ncsi_dev_priv *ndp)
> > } else {
> > hot_nc = NULL;
> > nc->state = NCSI_CHANNEL_INACTIVE;
> > +
> > netdev_dbg(ndp->ndev.dev,
> > - "NCSI: channel %u link down after config\n",
> > - nc->id);
> > + "NCSI: pkg %u ch %u link down after config\n",
> > + nc->package->id, nc->id);
> > }
> > spin_unlock_irqrestore(&nc->lock, flags);
> >
> > @@ -853,6 +891,8 @@ static int ncsi_choose_active_channel(struct ncsi_dev_priv *ndp)
> > force_package = ndp->force_package;
> > spin_unlock_irqrestore(&ndp->lock, flags);
> >
> > + netdev_dbg(ndp->ndev.dev, "NCSI: %s\n", __func__);
> > +
> > /* Force a specific channel whether or not it has link if we have been
> > * configured to do so
> > */
> > @@ -861,8 +901,8 @@ static int ncsi_choose_active_channel(struct ncsi_dev_priv *ndp)
> > ncm = &found->modes[NCSI_MODE_LINK];
> > if (!(ncm->data[2] & 0x1))
> > netdev_info(ndp->ndev.dev,
> > - "NCSI: Channel %u forced, but it is link down\n",
> > - found->id);
> > + "NCSI: pkg %u ch %u forced, but it is link down\n",
> > + found->package->id, found->id);
> > goto out;
> > }
> >
> > @@ -914,6 +954,7 @@ static int ncsi_choose_active_channel(struct ncsi_dev_priv *ndp)
> > out:
> > spin_lock_irqsave(&ndp->lock, flags);
> > list_add_tail_rcu(&found->link, &ndp->channel_queue);
> > +
> > spin_unlock_irqrestore(&ndp->lock, flags);
> >
> > return ncsi_process_next_channel(ndp);
> > @@ -1154,6 +1195,8 @@ static void ncsi_dev_work(struct work_struct *work)
> > struct ncsi_dev_priv, work);
> > struct ncsi_dev *nd = &ndp->ndev;
> >
> > + netdev_dbg(ndp->ndev.dev, "NCSI: %s\n", __func__);
> > +
> > switch (nd->state & ncsi_dev_state_major) {
> > case ncsi_dev_state_probe:
> > ncsi_probe_channel(ndp);
> > @@ -1176,6 +1219,8 @@ int ncsi_process_next_channel(struct ncsi_dev_priv *ndp)
> > int old_state;
> > unsigned long flags;
> >
> > + netdev_dbg(ndp->ndev.dev, "NCSI: %s\n", __func__);
> > +
> > spin_lock_irqsave(&ndp->lock, flags);
> > nc = list_first_or_null_rcu(&ndp->channel_queue,
> > struct ncsi_channel, link);
> > @@ -1198,14 +1243,14 @@ int ncsi_process_next_channel(struct ncsi_dev_priv *ndp)
> > switch (old_state) {
> > case NCSI_CHANNEL_INACTIVE:
> > ndp->ndev.state = ncsi_dev_state_config;
> > - netdev_dbg(ndp->ndev.dev, "NCSI: configuring channel %u\n",
> > - nc->id);
> > + netdev_dbg(ndp->ndev.dev, "NCSI: configuring pkg %u ch %u\n",
> > + nc->package->id, nc->id);
> > ncsi_configure_channel(ndp);
> > break;
> > case NCSI_CHANNEL_ACTIVE:
> > ndp->ndev.state = ncsi_dev_state_suspend;
> > - netdev_dbg(ndp->ndev.dev, "NCSI: suspending channel %u\n",
> > - nc->id);
> > + netdev_dbg(ndp->ndev.dev, "NCSI: suspending pkg %u ch %u\n",
> > + nc->package->id, nc->id);
> > ncsi_suspend_channel(ndp);
> > break;
> > default:
> > @@ -1225,6 +1270,9 @@ int ncsi_process_next_channel(struct ncsi_dev_priv *ndp)
> > return ncsi_choose_active_channel(ndp);
> > }
> >
> > + netdev_dbg(ndp->ndev.dev,
> > + "NCSI: No more channels to process\n");
> > +
> > ncsi_report_link(ndp, false);
> > return -ENODEV;
> > }
> > @@ -1475,6 +1523,7 @@ struct ncsi_dev *ncsi_register_dev(struct net_device *dev,
> > if (list_empty(&ncsi_dev_list))
> > register_inet6addr_notifier(&ncsi_inet6addr_notifier);
> > #endif
> > +
> > list_add_tail_rcu(&ndp->node, &ncsi_dev_list);
> > spin_unlock_irqrestore(&ncsi_dev_lock, flags);
> >
> > @@ -1564,6 +1613,7 @@ void ncsi_unregister_dev(struct ncsi_dev *nd)
> > if (list_empty(&ncsi_dev_list))
> > unregister_inet6addr_notifier(&ncsi_inet6addr_notifier);
> > #endif
> > +
> > spin_unlock_irqrestore(&ncsi_dev_lock, flags);
> >
> > ncsi_unregister_netlink(nd->dev);
> > diff --git a/net/ncsi/ncsi-netlink.c b/net/ncsi/ncsi-netlink.c
> > index 45f33d6..ab1a959 100644
> > --- a/net/ncsi/ncsi-netlink.c
> > +++ b/net/ncsi/ncsi-netlink.c
> > @@ -20,6 +20,7 @@
> > #include <uapi/linux/ncsi.h>
> >
> > #include "internal.h"
> > +#include "ncsi-pkt.h"
> > #include "ncsi-netlink.h"
> >
> > static struct genl_family ncsi_genl_family;
> > @@ -29,6 +30,7 @@ static const struct nla_policy ncsi_genl_policy[NCSI_ATTR_MAX + 1] = {
> > [NCSI_ATTR_PACKAGE_LIST] = { .type = NLA_NESTED },
> > [NCSI_ATTR_PACKAGE_ID] = { .type = NLA_U32 },
> > [NCSI_ATTR_CHANNEL_ID] = { .type = NLA_U32 },
> > + [NCSI_ATTR_DATA] = { .type = NLA_BINARY, .len = 2048 },
> > };
>
> Is there a particular reason for setting len to 2048, or just a decent
> buffer?
>
It is a decent buffer size as it can contain the whole network packet and also have the room to grow
if we want to extend the usage.
> >
> > static struct ncsi_dev_priv *ndp_from_ifindex(struct net *net, u32 ifindex)
> > @@ -240,7 +242,7 @@ static int ncsi_pkg_info_all_nl(struct sk_buff *skb,
> > return 0; /* done */
> >
> > hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
> > - &ncsi_genl_family, NLM_F_MULTI, NCSI_CMD_PKG_INFO);
> > + &ncsi_genl_family, NLM_F_MULTI, NCSI_CMD_PKG_INFO);
> > if (!hdr) {
> > rc = -EMSGSIZE;
> > goto err;
> > @@ -316,8 +318,8 @@ static int ncsi_set_interface_nl(struct sk_buff *msg, struct genl_info *info)
> > * package
> > */
> > spin_unlock_irqrestore(&ndp->lock, flags);
> > - netdev_info(ndp->ndev.dev, "NCSI: Channel %u does not exist!\n",
> > - channel_id);
> > + netdev_info(ndp->ndev.dev, "NCSI: pkg %u ch %u does not exist!\n",
> > + package_id, channel_id);
> > return -ERANGE;
> > }
> >
> > @@ -366,6 +368,191 @@ static int ncsi_clear_interface_nl(struct sk_buff *msg, struct genl_info *info)
> > return 0;
> > }
> >
> > +static int ncsi_send_cmd_nl(struct sk_buff *msg, struct genl_info *info)
> > +{
> > + struct ncsi_dev_priv *ndp;
> > +
> > + struct ncsi_cmd_arg nca;
> > + struct ncsi_pkt_hdr *hdr;
> > +
> > + u32 package_id, channel_id;
> > + unsigned char *data;
> > + void *head;
> > + int len, ret;
> > +
> > + if (!info || !info->attrs) {
> > + ret = -EINVAL;
> > + goto out;
> > + }
> > +
> > + if (!info->attrs[NCSI_ATTR_IFINDEX]) {
> > + ret = -EINVAL;
> > + goto out;
> > + }
> > +
> > + if (!info->attrs[NCSI_ATTR_PACKAGE_ID]) {
> > + ret = -EINVAL;
> > + goto out;
> > + }
> > +
> > + if (!info->attrs[NCSI_ATTR_CHANNEL_ID]) {
> > + ret = -EINVAL;
> > + goto out;
> > + }
> > +
> > + ndp = ndp_from_ifindex(get_net(sock_net(msg->sk)),
> > + nla_get_u32(info->attrs[NCSI_ATTR_IFINDEX]));
> > + if (!ndp) {
> > + ret = -ENODEV;
> > + goto out;
> > + }
> > +
> > + package_id = nla_get_u32(info->attrs[NCSI_ATTR_PACKAGE_ID]);
> > + channel_id = nla_get_u32(info->attrs[NCSI_ATTR_CHANNEL_ID]);
> > +
> > + if ((package_id & ~0x07) || (channel_id & ~0x1f)) {
> > + ret = -ERANGE;
> > + goto out_netlink;
> > + }
>
> This is correct but hard to read; we could instead just have
> if ((package_id >= 8) ...
> which is easier to interpret.
> (Probably we should also define the max packages/channels somewhere too)
>
I will add the definition for the max packages/channels and use it instead.
> > +
> > + len = nla_len(info->attrs[NCSI_ATTR_DATA]);
> > + if (len < sizeof(struct ncsi_pkt_hdr)) {
> > + netdev_info(ndp->ndev.dev, "NCSI: no OEM command to send %u\n",
> > + package_id);
>
> For statements like these follow the netdev format, eg:
> netdev_info(ndp->ndev.dev, "NCSI: no OEM command to send %u\n",
> package_id);
>
> > + ret = -EINVAL;
> > + goto out_netlink;
> > + } else {
> > + head = nla_data(info->attrs[NCSI_ATTR_DATA]);
> > + data = (unsigned char *)head;
> > + }
> > +
> > + hdr = (struct ncsi_pkt_hdr *)data;
> > +
> > + nca.ndp = ndp;
> > + nca.package = (unsigned char)package_id;
> > + nca.channel = (unsigned char)channel_id;
> > + nca.type = hdr->type;
> > + nca.req_flags = NCSI_REQ_FLAG_NETLINK_DRIVEN;
> > + nca.info = info;
> > + nca.payload = ntohs(hdr->length);
> > + nca.data = data;
> > +
> > + ret = ncsi_xmit_cmd(&nca);
> > +out_netlink:
> > + if (ret != 0) {
> > + netdev_err(ndp->ndev.dev, "Error %d sending OEM command\n", ret);
> > + ncsi_send_netlink_err(ndp->ndev.dev,
> > + info->snd_seq, info->snd_portid, info->nlhdr,
> > + ret);
> > + }
> > +out:
> > + return ret;
> > +}
> > +
> > +int ncsi_send_netlink_rsp(struct ncsi_request *nr, struct ncsi_package *np, struct ncsi_channel *nc)
> > +{
> > + struct sk_buff *skb;
> > + struct net *net;
> > + void *hdr;
> > + int rc;
> > +
> > + netdev_dbg(nr->ndp->ndev.dev, "NCSI: %s\n", __func__);
> > +
> > + net = dev_net(nr->rsp->dev);
> > +
> > + skb = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
> > + if (!skb)
> > + return -ENOMEM;
> > +
> > + hdr = genlmsg_put(skb, nr->snd_portid, nr->snd_seq,
> > + &ncsi_genl_family, 0, NCSI_CMD_SEND_CMD);
> > + if (!hdr) {
> > + kfree_skb(skb);
> > + return -EMSGSIZE;
> > + }
> > +
> > + nla_put_u32(skb, NCSI_ATTR_IFINDEX, nr->rsp->dev->ifindex);
> > + if (np)
> > + nla_put_u32(skb, NCSI_ATTR_PACKAGE_ID, np->id);
> > + if (nc)
> > + nla_put_u32(skb, NCSI_ATTR_CHANNEL_ID, nc->id);
> > + else
> > + nla_put_u32(skb, NCSI_ATTR_CHANNEL_ID, NCSI_RESERVED_CHANNEL);
> > +
> > + rc = nla_put(skb, NCSI_ATTR_DATA, nr->rsp->len, (void *)nr->rsp->data);
> > + if (rc)
> > + goto err;
> > +
> > + genlmsg_end(skb, hdr);
> > + return genlmsg_unicast(net, skb, nr->snd_portid);
> > +
> > +err:
> > + kfree_skb(skb);
> > + return rc;
> > +}
> > +
> > +int ncsi_send_netlink_timeout(struct ncsi_request *nr, struct ncsi_package *np, struct ncsi_channel *nc)
> > +{
> > + struct sk_buff *skb;
> > + struct net *net;
> > + void *hdr;
> > +
> > + netdev_dbg(nr->ndp->ndev.dev, "NCSI: %s\n", __func__);
> > +
> > + skb = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
> > + if (!skb)
> > + return -ENOMEM;
> > +
> > + hdr = genlmsg_put(skb, nr->snd_portid, nr->snd_seq,
> > + &ncsi_genl_family, 0, NCSI_CMD_SEND_CMD);
> > + if (!hdr) {
> > + kfree_skb(skb);
> > + return -EMSGSIZE;
> > + }
> > +
> > + net = dev_net(nr->cmd->dev);
> > +
> > + nla_put_u32(skb, NCSI_ATTR_IFINDEX, nr->cmd->dev->ifindex);
> > +
> > + if (np)
> > + nla_put_u32(skb, NCSI_ATTR_PACKAGE_ID, np->id);
> > + else
> > + nla_put_u32(skb, NCSI_ATTR_PACKAGE_ID,
> > + NCSI_PACKAGE_INDEX((((struct ncsi_pkt_hdr *)nr->cmd->data)->channel)));
> > +
> > + if (nc)
> > + nla_put_u32(skb, NCSI_ATTR_CHANNEL_ID, nc->id);
> > + else
> > + nla_put_u32(skb, NCSI_ATTR_CHANNEL_ID, NCSI_RESERVED_CHANNEL);
> > +
> > + genlmsg_end(skb, hdr);
> > + return genlmsg_unicast(net, skb, nr->snd_portid);
>
> How does the receiver of this message know it represents a timeout? Just that
> it's missing the NCSI_ATTR_DATA attribute?
>
That is correct. The missing NCSI_ATTR_DATA attribute indicates that there is no data received.
> > +}
> > +
> > +int ncsi_send_netlink_err(struct net_device *dev, u32 snd_seq, u32 snd_portid, struct nlmsghdr *nlhdr, int err)
> > +{
> > + struct sk_buff *skb;
> > + struct nlmsghdr *nlh;
> > + struct nlmsgerr *nle;
> > + struct net *net;
> > +
> > + skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
> > + if (!skb)
> > + return -ENOMEM;
> > +
> > + net = dev_net(dev);
> > +
> > + nlh = nlmsg_put(skb, snd_portid, snd_seq,
> > + NLMSG_ERROR, sizeof(*nle), 0);
> > + nle = (struct nlmsgerr *)nlmsg_data(nlh);
> > + nle->error = err;
> > + memcpy(&nle->msg, nlhdr, sizeof(*nlh));
> > +
> > + nlmsg_end(skb, nlh);
> > +
> > + return nlmsg_unicast(net->genl_sock, skb, snd_portid);
> > +}
> > +
> > static const struct genl_ops ncsi_ops[] = {
> > {
> > .cmd = NCSI_CMD_PKG_INFO,
> > @@ -386,6 +573,12 @@ static const struct genl_ops ncsi_ops[] = {
> > .doit = ncsi_clear_interface_nl,
> > .flags = GENL_ADMIN_PERM,
> > },
> > + {
> > + .cmd = NCSI_CMD_SEND_CMD,
> > + .policy = ncsi_genl_policy,
> > + .doit = ncsi_send_cmd_nl,
> > + .flags = GENL_ADMIN_PERM,
> > + },
> > };
> >
> > static struct genl_family ncsi_genl_family __ro_after_init = {
> > diff --git a/net/ncsi/ncsi-netlink.h b/net/ncsi/ncsi-netlink.h
> > index 91a5c25..dadaf32 100644
> > --- a/net/ncsi/ncsi-netlink.h
> > +++ b/net/ncsi/ncsi-netlink.h
> > @@ -14,6 +14,10 @@
> >
> > #include "internal.h"
> >
> > +int ncsi_send_netlink_rsp(struct ncsi_request *nr, struct ncsi_package *np, struct ncsi_channel *nc);
> > +int ncsi_send_netlink_timeout(struct ncsi_request *nr, struct ncsi_package *np, struct ncsi_channel *nc);
> > +int ncsi_send_netlink_err(struct net_device *dev, u32 snd_seq, u32 snd_portid, struct nlmsghdr *nlhdr, int err);
> > +
> > int ncsi_init_netlink(struct net_device *dev);
> > int ncsi_unregister_netlink(struct net_device *dev);
> >
> > diff --git a/net/ncsi/ncsi-rsp.c b/net/ncsi/ncsi-rsp.c
> > index 930c1d3..bdf9519 100644
> > --- a/net/ncsi/ncsi-rsp.c
> > +++ b/net/ncsi/ncsi-rsp.c
> > @@ -16,9 +16,11 @@
> > #include <net/ncsi.h>
> > #include <net/net_namespace.h>
> > #include <net/sock.h>
> > +#include <net/genetlink.h>
> >
> > #include "internal.h"
> > #include "ncsi-pkt.h"
> > +#include "ncsi-netlink.h"
> >
> > static int ncsi_validate_rsp_pkt(struct ncsi_request *nr,
> > unsigned short payload)
> > @@ -32,15 +34,22 @@ static int ncsi_validate_rsp_pkt(struct ncsi_request *nr,
> > * before calling this function.
> > */
> > h = (struct ncsi_rsp_pkt_hdr *)skb_network_header(nr->rsp);
> > - if (h->common.revision != NCSI_PKT_REVISION)
> > +
> > + if (h->common.revision != NCSI_PKT_REVISION) {
> > + netdev_dbg(nr->ndp->ndev.dev, "NCSI: unsupported header revision\n");
> > return -EINVAL;
> > - if (ntohs(h->common.length) != payload)
> > + }
> > + if (ntohs(h->common.length) != payload) {
> > + netdev_dbg(nr->ndp->ndev.dev, "NCSI: payload length mismatched\n");
> > return -EINVAL;
> > + }
> >
> > /* Check on code and reason */
> > if (ntohs(h->code) != NCSI_PKT_RSP_C_COMPLETED ||
> > - ntohs(h->reason) != NCSI_PKT_RSP_R_NO_ERROR)
> > - return -EINVAL;
> > + ntohs(h->reason) != NCSI_PKT_RSP_R_NO_ERROR) {
> > + netdev_dbg(nr->ndp->ndev.dev, "NCSI: non zero response/reason code\n");
> > + return -EPERM;
> > + }
>
> Why the change to EPERM?
>
We need to return the response/reason code to the caller. If this function returns -EPERM,
ncsi_rsp_handler() will call ncsi_rsp_handler_netlink(nr) to send back the.
> >
> > /* Validate checksum, which might be zeroes if the
> > * sender doesn't support checksum according to NCSI
> > @@ -52,8 +61,11 @@ static int ncsi_validate_rsp_pkt(struct ncsi_request *nr,
> >
> > checksum = ncsi_calculate_checksum((unsigned char *)h,
> > sizeof(*h) + payload - 4);
> > - if (*pchecksum != htonl(checksum))
> > +
> > + if (*pchecksum != htonl(checksum)) {
> > + netdev_dbg(nr->ndp->ndev.dev, "NCSI: checksum mismatched\n");
> > return -EINVAL;
> > + }
> >
> > return 0;
> > }
> > @@ -900,6 +912,31 @@ static int ncsi_rsp_handler_gpuuid(struct ncsi_request *nr)
> > return 0;
> > }
> >
> > +static int ncsi_rsp_handler_oem(struct ncsi_request *nr)
> > +{
> > + return 0;
> > +}
> > +
> > +static int ncsi_rsp_handler_netlink(struct ncsi_request *nr)
> > +{
> > + struct ncsi_rsp_pkt *rsp;
> > + struct ncsi_dev_priv *ndp = nr->ndp;
> > + struct ncsi_package *np;
> > + struct ncsi_channel *nc;
> > + int ret;
> > +
> > + /* Find the package */
> > + rsp = (struct ncsi_rsp_pkt *)skb_network_header(nr->rsp);
> > + ncsi_find_package_and_channel(ndp, rsp->rsp.common.channel,
> > + &np, &nc);
> > + if (!np)
> > + return -ENODEV;
> > +
> > + ret = ncsi_send_netlink_rsp(nr, np, nc);
> > +
> > + return ret;
> > +}
> > +
> > static struct ncsi_rsp_handler {
> > unsigned char type;
> > int payload;
> > @@ -932,7 +969,7 @@ static struct ncsi_rsp_handler {
> > { NCSI_PKT_RSP_GNS, 172, ncsi_rsp_handler_gns },
> > { NCSI_PKT_RSP_GNPTS, 172, ncsi_rsp_handler_gnpts },
> > { NCSI_PKT_RSP_GPS, 8, ncsi_rsp_handler_gps },
> > - { NCSI_PKT_RSP_OEM, 0, NULL },
> > + { NCSI_PKT_RSP_OEM, -1, ncsi_rsp_handler_oem },
> > { NCSI_PKT_RSP_PLDM, 0, NULL },
> > { NCSI_PKT_RSP_GPUUID, 20, ncsi_rsp_handler_gpuuid }
> > };
> > @@ -950,6 +987,7 @@ int ncsi_rcv_rsp(struct sk_buff *skb, struct net_device *dev,
> >
> > /* Find the NCSI device */
> > nd = ncsi_find_dev(dev);
> > +
> > ndp = nd ? TO_NCSI_DEV_PRIV(nd) : NULL;
>
> There's a few spots around where you've added or changed whitespace,
> please clean these bits up.
>
> > if (!ndp)
> > return -ENODEV;
> > @@ -1002,6 +1040,15 @@ int ncsi_rcv_rsp(struct sk_buff *skb, struct net_device *dev,
> > netdev_warn(ndp->ndev.dev,
> > "NCSI: 'bad' packet ignored for type 0x%x\n",
> > hdr->type);
> > +
> > + if (nr->flags == NCSI_REQ_FLAG_NETLINK_DRIVEN) {
> > + if (ret == -EPERM)
> > + goto out_netlink;
> > + else
> > + ncsi_send_netlink_err(ndp->ndev.dev,
> > + nr->snd_seq, nr->snd_portid, &nr->nlhdr,
> > + ret);
> > + }
>
> More netdev formatting, multi-line statements should be like:
>
> ncsi_send_netlink_err(ndp->ndev.dev,
> nr->snd_seq, nr->snd_portid, &nr->nlhdr,
> ret);
>
> > goto out;
> > }
> >
> > @@ -1011,6 +1058,17 @@ int ncsi_rcv_rsp(struct sk_buff *skb, struct net_device *dev,
> > netdev_err(ndp->ndev.dev,
> > "NCSI: Handler for packet type 0x%x returned %d\n",
> > hdr->type, ret);
> > +
> > +out_netlink:
> > + if (nr->flags == NCSI_REQ_FLAG_NETLINK_DRIVEN) {
> > + ret = ncsi_rsp_handler_netlink(nr);
> > + if (ret) {
> > + netdev_err(ndp->ndev.dev,
> > + "NCSI: Netlink handler for packet type 0x%x returned %d\n",
> > + hdr->type, ret);
> > + }
> > + }
> > +
> > out:
> > ncsi_free_request(nr);
> > return ret;
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