From 9ab933ab2cc80f04690d6aa385b1110075c5e507 Mon Sep 17 00:00:00 2001 From: John Fastabend Date: Thu, 30 Dec 2010 09:26:31 +0000 Subject: [PATCH] dcbnl: add appliction tlv handlers This patch adds application tlv handlers. Networking stacks may use the application priority to set the skb priority of their stack using the negoatiated dcbx priority. This patch provides the dcb_{get|set}app() routines for the stack to query these parameters. Notice lower layer drivers can use the dcbnl_ops routines if additional handling is needed. Perhaps in the firmware case for example Signed-off-by: John Fastabend Signed-off-by: Shmulik Ravid Signed-off-by: David S. Miller --- include/linux/dcbnl.h | 4 +- include/net/dcbnl.h | 9 ++++ net/dcb/dcbnl.c | 133 ++++++++++++++++++++++++++++++++++++++++++++++---- 3 files changed, 135 insertions(+), 11 deletions(-) diff --git a/include/linux/dcbnl.h b/include/linux/dcbnl.h index 287b561..775bdb4 100644 --- a/include/linux/dcbnl.h +++ b/include/linux/dcbnl.h @@ -82,7 +82,9 @@ struct ieee_pfc { __u64 indications[IEEE_8021QAZ_MAX_TCS]; }; -/* This structure contains the IEEE 802.1Qaz APP managed object +/* This structure contains the IEEE 802.1Qaz APP managed object. This + * object is also used for the CEE std as well. There is no difference + * between the objects. * * @selector: protocol identifier type * @protocol: protocol of type indicated diff --git a/include/net/dcbnl.h b/include/net/dcbnl.h index e2d841e..ab7d623 100644 --- a/include/net/dcbnl.h +++ b/include/net/dcbnl.h @@ -22,6 +22,15 @@ #include +struct dcb_app_type { + char name[IFNAMSIZ]; + struct dcb_app app; + struct list_head list; +}; + +u8 dcb_setapp(struct net_device *, struct dcb_app *); +u8 dcb_getapp(struct net_device *, struct dcb_app *); + /* * Ops struct for the netlink callbacks. Used by DCB-enabled drivers through * the netdevice struct. diff --git a/net/dcb/dcbnl.c b/net/dcb/dcbnl.c index 2ff9084..cfd731f 100644 --- a/net/dcb/dcbnl.c +++ b/net/dcb/dcbnl.c @@ -179,6 +179,9 @@ static const struct nla_policy dcbnl_ieee_app[DCB_ATTR_IEEE_APP_MAX + 1] = { [DCB_ATTR_IEEE_APP] = {.len = sizeof(struct dcb_app)}, }; +static LIST_HEAD(dcb_app_list); +static DEFINE_SPINLOCK(dcb_lock); + /* standard netlink reply call */ static int dcbnl_reply(u8 value, u8 event, u8 cmd, u8 attr, u32 pid, u32 seq, u16 flags) @@ -634,12 +637,12 @@ out: static int dcbnl_setapp(struct net_device *netdev, struct nlattr **tb, u32 pid, u32 seq, u16 flags) { - int ret = -EINVAL; + int err, ret = -EINVAL; u16 id; u8 up, idtype; struct nlattr *app_tb[DCB_APP_ATTR_MAX + 1]; - if (!tb[DCB_ATTR_APP] || !netdev->dcbnl_ops->setapp) + if (!tb[DCB_ATTR_APP]) goto out; ret = nla_parse_nested(app_tb, DCB_APP_ATTR_MAX, tb[DCB_ATTR_APP], @@ -663,9 +666,18 @@ static int dcbnl_setapp(struct net_device *netdev, struct nlattr **tb, id = nla_get_u16(app_tb[DCB_APP_ATTR_ID]); up = nla_get_u8(app_tb[DCB_APP_ATTR_PRIORITY]); - ret = dcbnl_reply(netdev->dcbnl_ops->setapp(netdev, idtype, id, up), - RTM_SETDCB, DCB_CMD_SAPP, DCB_ATTR_APP, - pid, seq, flags); + if (netdev->dcbnl_ops->setapp) { + err = netdev->dcbnl_ops->setapp(netdev, idtype, id, up); + } else { + struct dcb_app app; + app.selector = idtype; + app.protocol = id; + app.priority = up; + err = dcb_setapp(netdev, &app); + } + + ret = dcbnl_reply(err, RTM_SETDCB, DCB_CMD_SAPP, DCB_ATTR_APP, + pid, seq, flags); out: return ret; } @@ -1164,7 +1176,7 @@ static int dcbnl_ieee_set(struct net_device *netdev, struct nlattr **tb, goto err; } - if (ieee[DCB_ATTR_IEEE_APP_TABLE] && ops->ieee_setapp) { + if (ieee[DCB_ATTR_IEEE_APP_TABLE]) { struct nlattr *attr; int rem; @@ -1173,7 +1185,10 @@ static int dcbnl_ieee_set(struct net_device *netdev, struct nlattr **tb, if (nla_type(attr) != DCB_ATTR_IEEE_APP) continue; app_data = nla_data(attr); - err = ops->ieee_setapp(netdev, app_data); + if (ops->ieee_setapp) + err = ops->ieee_setapp(netdev, app_data); + else + err = dcb_setapp(netdev, app_data); if (err) goto err; } @@ -1193,7 +1208,8 @@ static int dcbnl_ieee_get(struct net_device *netdev, struct nlattr **tb, struct sk_buff *skb; struct nlmsghdr *nlh; struct dcbmsg *dcb; - struct nlattr *ieee; + struct nlattr *ieee, *app; + struct dcb_app_type *itr; const struct dcbnl_rtnl_ops *ops = netdev->dcbnl_ops; int err; @@ -1230,6 +1246,19 @@ static int dcbnl_ieee_get(struct net_device *netdev, struct nlattr **tb, NLA_PUT(skb, DCB_ATTR_IEEE_PFC, sizeof(pfc), &pfc); } + app = nla_nest_start(skb, DCB_ATTR_IEEE_APP_TABLE); + if (!app) + goto nla_put_failure; + + spin_lock(&dcb_lock); + list_for_each_entry(itr, &dcb_app_list, list) { + if (strncmp(itr->name, netdev->name, IFNAMSIZ) == 0) + NLA_PUT(skb, DCB_ATTR_IEEE_APP, + sizeof(itr->app), &itr->app); + } + spin_unlock(&dcb_lock); + nla_nest_end(skb, app); + nla_nest_end(skb, ieee); nlmsg_end(skb, nlh); @@ -1364,8 +1393,93 @@ out: return ret; } +/** + * dcb_getapp - retrieve the DCBX application user priority + * + * On success returns a non-zero 802.1p user priority bitmap + * otherwise returns 0 as the invalid user priority bitmap to + * indicate an error. + */ +u8 dcb_getapp(struct net_device *dev, struct dcb_app *app) +{ + struct dcb_app_type *itr; + u8 prio = 0; + + spin_lock(&dcb_lock); + list_for_each_entry(itr, &dcb_app_list, list) { + if (itr->app.selector == app->selector && + itr->app.protocol == app->protocol && + (strncmp(itr->name, dev->name, IFNAMSIZ) == 0)) { + prio = itr->app.priority; + break; + } + } + spin_unlock(&dcb_lock); + + return prio; +} +EXPORT_SYMBOL(dcb_getapp); + +/** + * ixgbe_dcbnl_setapp - add dcb application data to app list + * + * Priority 0 is the default priority this removes applications + * from the app list if the priority is set to zero. + */ +u8 dcb_setapp(struct net_device *dev, struct dcb_app *new) +{ + struct dcb_app_type *itr; + + spin_lock(&dcb_lock); + /* Search for existing match and replace */ + list_for_each_entry(itr, &dcb_app_list, list) { + if (itr->app.selector == new->selector && + itr->app.protocol == new->protocol && + (strncmp(itr->name, dev->name, IFNAMSIZ) == 0)) { + if (new->priority) + itr->app.priority = new->priority; + else { + list_del(&itr->list); + kfree(itr); + } + goto out; + } + } + /* App type does not exist add new application type */ + if (new->priority) { + struct dcb_app_type *entry; + entry = kmalloc(sizeof(struct dcb_app_type), GFP_ATOMIC); + if (!entry) { + spin_unlock(&dcb_lock); + return -ENOMEM; + } + + memcpy(&entry->app, new, sizeof(*new)); + strncpy(entry->name, dev->name, IFNAMSIZ); + list_add(&entry->list, &dcb_app_list); + } +out: + spin_unlock(&dcb_lock); + return 0; +} +EXPORT_SYMBOL(dcb_setapp); + +void dcb_flushapp(void) +{ + struct dcb_app_type *app; + + spin_lock(&dcb_lock); + list_for_each_entry(app, &dcb_app_list, list) { + list_del(&app->list); + kfree(app); + } + spin_unlock(&dcb_lock); +} + static int __init dcbnl_init(void) { + INIT_LIST_HEAD(&dcb_app_list); + rtnl_register(PF_UNSPEC, RTM_GETDCB, dcb_doit, NULL); rtnl_register(PF_UNSPEC, RTM_SETDCB, dcb_doit, NULL); @@ -1377,7 +1491,6 @@ static void __exit dcbnl_exit(void) { rtnl_unregister(PF_UNSPEC, RTM_GETDCB); rtnl_unregister(PF_UNSPEC, RTM_SETDCB); + dcb_flushapp(); } module_exit(dcbnl_exit); - - -- 2.7.4