| Message ID | 58fff61ffd8d4038b59f32b696e76bbc@AUSX13MPS306.AMER.DELL.COM |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
| Series | [net,v2] net/ncsi: Extend NC-SI Netlink interface to allow user space to send NC-SI command | expand |
On Fri, 2018-09-28 at 18:15 +0000, Justin.Lee1@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@dell.com> Hi Justin, This is looking pretty good, combined with Vijay's base patch the two approaches should fit together nicely ( http://patchwork.ozlabs.org/patch/976510/). A good merge order would probably be the above patch first, then this patch and Vijay's further OEM patches based on top of that to reduce conflicts. Cheers, Sam > > --- > include/uapi/linux/ncsi.h | 3 + > net/ncsi/internal.h | 12 ++- > net/ncsi/ncsi-cmd.c | 47 ++++++++++- > net/ncsi/ncsi-manage.c | 22 +++++ > net/ncsi/ncsi-netlink.c | 205 ++++++++++++++++++++++++++++++++++++++++++++++ > net/ncsi/ncsi-netlink.h | 12 +++ > net/ncsi/ncsi-rsp.c | 71 ++++++++++++++-- > 7 files changed, 363 insertions(+), 9 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..1a3ef9e 100644 > --- a/net/ncsi/internal.h > +++ b/net/ncsi/internal.h > @@ -171,6 +171,8 @@ struct ncsi_package; > #define NCSI_RESERVED_CHANNEL 0x1f > #define NCSI_CHANNEL_INDEX(c) ((c) & ((1 << NCSI_PACKAGE_SHIFT) - 1)) > #define NCSI_TO_CHANNEL(p, c) (((p) << NCSI_PACKAGE_SHIFT) | (c)) > +#define NCSI_MAX_PACKAGE 8 > +#define NCSI_MAX_CHANNEL 32 > > struct ncsi_channel { > unsigned char id; > @@ -215,12 +217,17 @@ 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 { > @@ -305,6 +312,9 @@ struct ncsi_cmd_arg { > 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-cmd.c b/net/ncsi/ncsi-cmd.c > index 7567ca63..43b544c 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" > @@ -211,6 +212,39 @@ 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; > +} > + > static struct ncsi_cmd_handler { > unsigned char type; > int payload; > @@ -244,7 +278,7 @@ static struct ncsi_cmd_handler { > { 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_OEM, -1, ncsi_cmd_handler_oem }, > { NCSI_PKT_CMD_PLDM, 0, NULL }, > { NCSI_PKT_CMD_GPUUID, 0, ncsi_cmd_handler_default } > }; > @@ -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); > diff --git a/net/ncsi/ncsi-manage.c b/net/ncsi/ncsi-manage.c > index 0912847..29f33a1 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" > @@ -406,8 +407,13 @@ 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 +421,26 @@ 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); > } > diff --git a/net/ncsi/ncsi-netlink.c b/net/ncsi/ncsi-netlink.c > index 45f33d6..ce57675 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 }, > }; > > static struct ncsi_dev_priv *ndp_from_ifindex(struct net *net, u32 ifindex) > @@ -366,6 +368,203 @@ 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 >= NCSI_MAX_PACKAGE || channel_id >= NCSI_MAX_CHANNEL) { > + ret = -ERANGE; > + goto out_netlink; > + } > + > + 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); > + 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); > +} > + > +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 +585,12 @@ 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..c4a4688 100644 > --- a/net/ncsi/ncsi-netlink.h > +++ b/net/ncsi/ncsi-netlink.h > @@ -14,6 +14,18 @@ > > #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..010970f 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; > + } > > /* 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 } > }; > @@ -1002,6 +1039,17 @@ 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); > + } > goto out; > } > > @@ -1011,6 +1059,17 @@ 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;
Hi Sam, Sure, I will generate v3 after Vijay's patch is approved. Thanks, Justin > On Fri, 2018-09-28 at 18:15 +0000, Justin.Lee1@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@dell.com> > > Hi Justin, > > This is looking pretty good, combined with Vijay's base patch the two > approaches should fit together nicely ( > http://patchwork.ozlabs.org/patch/976510/). > > A good merge order would probably be the above patch first, then this > patch and Vijay's further OEM patches based on top of that to reduce > conflicts. > > Cheers, > Sam
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..1a3ef9e 100644 --- a/net/ncsi/internal.h +++ b/net/ncsi/internal.h @@ -171,6 +171,8 @@ struct ncsi_package; #define NCSI_RESERVED_CHANNEL 0x1f #define NCSI_CHANNEL_INDEX(c) ((c) & ((1 << NCSI_PACKAGE_SHIFT) - 1)) #define NCSI_TO_CHANNEL(p, c) (((p) << NCSI_PACKAGE_SHIFT) | (c)) +#define NCSI_MAX_PACKAGE 8 +#define NCSI_MAX_CHANNEL 32 struct ncsi_channel { unsigned char id; @@ -215,12 +217,17 @@ 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 { @@ -305,6 +312,9 @@ struct ncsi_cmd_arg { 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-cmd.c b/net/ncsi/ncsi-cmd.c index 7567ca63..43b544c 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" @@ -211,6 +212,39 @@ 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; +} + static struct ncsi_cmd_handler { unsigned char type; int payload; @@ -244,7 +278,7 @@ static struct ncsi_cmd_handler { { 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_OEM, -1, ncsi_cmd_handler_oem }, { NCSI_PKT_CMD_PLDM, 0, NULL }, { NCSI_PKT_CMD_GPUUID, 0, ncsi_cmd_handler_default } }; @@ -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); diff --git a/net/ncsi/ncsi-manage.c b/net/ncsi/ncsi-manage.c index 0912847..29f33a1 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" @@ -406,8 +407,13 @@ 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 +421,26 @@ 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); } diff --git a/net/ncsi/ncsi-netlink.c b/net/ncsi/ncsi-netlink.c index 45f33d6..ce57675 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 }, }; static struct ncsi_dev_priv *ndp_from_ifindex(struct net *net, u32 ifindex) @@ -366,6 +368,203 @@ 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 >= NCSI_MAX_PACKAGE || channel_id >= NCSI_MAX_CHANNEL) { + ret = -ERANGE; + goto out_netlink; + } + + 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); + 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); +} + +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 +585,12 @@ 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..c4a4688 100644 --- a/net/ncsi/ncsi-netlink.h +++ b/net/ncsi/ncsi-netlink.h @@ -14,6 +14,18 @@ #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..010970f 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; + } /* 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 } }; @@ -1002,6 +1039,17 @@ 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); + } goto out; } @@ -1011,6 +1059,17 @@ 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;
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@dell.com> --- include/uapi/linux/ncsi.h | 3 + net/ncsi/internal.h | 12 ++- net/ncsi/ncsi-cmd.c | 47 ++++++++++- net/ncsi/ncsi-manage.c | 22 +++++ net/ncsi/ncsi-netlink.c | 205 ++++++++++++++++++++++++++++++++++++++++++++++ net/ncsi/ncsi-netlink.h | 12 +++ net/ncsi/ncsi-rsp.c | 71 ++++++++++++++-- 7 files changed, 363 insertions(+), 9 deletions(-)