From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ido Schimmel Subject: [PATCH net-next 1/8] net: dcb: For wild-card lookups, use priority -1, not 0 Date: Fri, 27 Jul 2018 15:26:55 +0300 Message-ID: <20180727122702.17995-2-idosch@mellanox.com> References: <20180727122702.17995-1-idosch@mellanox.com> Mime-Version: 1.0 Content-Type: text/plain Cc: davem@davemloft.net, jiri@mellanox.com, petrm@mellanox.com, mlxsw@mellanox.com, john.fastabend@gmail.com, Ido Schimmel To: netdev@vger.kernel.org Return-path: Received: from mail-eopbgr50046.outbound.protection.outlook.com ([40.107.5.46]:4544 "EHLO EUR03-VE1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729955AbeG0Nt7 (ORCPT ); Fri, 27 Jul 2018 09:49:59 -0400 In-Reply-To: <20180727122702.17995-1-idosch@mellanox.com> Sender: netdev-owner@vger.kernel.org List-ID: From: Petr Machata The function dcb_app_lookup walks the list of specified DCB APP entries, looking for one that matches a given criteria: ifindex, selector, protocol ID and optionally also priority. The "don't care" value for priority is set to 0, because that priority has not been allowed under CEE regime, which predates the IEEE standardization. Under IEEE, 0 is a valid priority number. But because dcb_app_lookup considers zero a wild card, attempts to add an APP entry with priority 0 fail when other entries exist for a given ifindex / selector / PID triplet. Fix by changing the wild-card value to -1. Signed-off-by: Petr Machata Signed-off-by: Ido Schimmel --- net/dcb/dcbnl.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/net/dcb/dcbnl.c b/net/dcb/dcbnl.c index 2589a6b78aa1..013fdb6fa07a 100644 --- a/net/dcb/dcbnl.c +++ b/net/dcb/dcbnl.c @@ -1786,7 +1786,7 @@ static struct dcb_app_type *dcb_app_lookup(const struct dcb_app *app, if (itr->app.selector == app->selector && itr->app.protocol == app->protocol && itr->ifindex == ifindex && - (!prio || itr->app.priority == prio)) + ((prio == -1) || itr->app.priority == prio)) return itr; } @@ -1821,7 +1821,8 @@ u8 dcb_getapp(struct net_device *dev, struct dcb_app *app) u8 prio = 0; spin_lock_bh(&dcb_lock); - if ((itr = dcb_app_lookup(app, dev->ifindex, 0))) + itr = dcb_app_lookup(app, dev->ifindex, -1); + if (itr) prio = itr->app.priority; spin_unlock_bh(&dcb_lock); @@ -1849,7 +1850,8 @@ int dcb_setapp(struct net_device *dev, struct dcb_app *new) spin_lock_bh(&dcb_lock); /* Search for existing match and replace */ - if ((itr = dcb_app_lookup(new, dev->ifindex, 0))) { + itr = dcb_app_lookup(new, dev->ifindex, -1); + if (itr) { if (new->priority) itr->app.priority = new->priority; else { @@ -1882,7 +1884,8 @@ u8 dcb_ieee_getapp_mask(struct net_device *dev, struct dcb_app *app) u8 prio = 0; spin_lock_bh(&dcb_lock); - if ((itr = dcb_app_lookup(app, dev->ifindex, 0))) + itr = dcb_app_lookup(app, dev->ifindex, -1); + if (itr) prio |= 1 << itr->app.priority; spin_unlock_bh(&dcb_lock); -- 2.17.1