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Date: Sun, 1 Oct 2017 05:46:12 +0800
From: kbuild test robot <lkp@...el.com>
To: Tom Herbert <tom@...ntonium.net>
Cc: kbuild-all@...org, davem@...emloft.net, netdev@...r.kernel.org,
rohit@...ntonium.net, Tom Herbert <tom@...ntonium.net>
Subject: Re: [PATCH v3 net-next 1/8] flow_dissector: Change skbuf argument to
be non const
Hi Tom,
[auto build test WARNING on net-next/master]
url: https://github.com/0day-ci/linux/commits/Tom-Herbert/flow_dissector-Change-skbuf-argument-to-be-non-const/20171001-052131
config: x86_64-randconfig-x010-201740 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64
All warnings (new ones prefixed by >>):
drivers/net/ethernet/sfc/rx.c: In function 'efx_filter_rfs':
>> drivers/net/ethernet/sfc/rx.c:842:34: warning: passing argument 1 of 'skb_flow_dissect_flow_keys' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
if (!skb_flow_dissect_flow_keys(skb, &fk, 0))
^~~
In file included from include/linux/ip.h:20:0,
from drivers/net/ethernet/sfc/rx.c:14:
include/linux/skbuff.h:1189:20: note: expected 'struct sk_buff *' but argument is of type 'const struct sk_buff *'
static inline bool skb_flow_dissect_flow_keys(struct sk_buff *skb,
^~~~~~~~~~~~~~~~~~~~~~~~~~
--
drivers/net/ethernet/sfc/falcon/rx.c: In function 'ef4_filter_rfs':
>> drivers/net/ethernet/sfc/falcon/rx.c:848:34: warning: passing argument 1 of 'skb_flow_dissect_flow_keys' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
if (!skb_flow_dissect_flow_keys(skb, &fk, 0))
^~~
In file included from include/linux/ip.h:20:0,
from drivers/net/ethernet/sfc/falcon/rx.c:14:
include/linux/skbuff.h:1189:20: note: expected 'struct sk_buff *' but argument is of type 'const struct sk_buff *'
static inline bool skb_flow_dissect_flow_keys(struct sk_buff *skb,
^~~~~~~~~~~~~~~~~~~~~~~~~~
vim +842 drivers/net/ethernet/sfc/rx.c
add724771 Ben Hutchings 2012-11-08 829
add724771 Ben Hutchings 2012-11-08 830 int efx_filter_rfs(struct net_device *net_dev, const struct sk_buff *skb,
add724771 Ben Hutchings 2012-11-08 831 u16 rxq_index, u32 flow_id)
add724771 Ben Hutchings 2012-11-08 832 {
add724771 Ben Hutchings 2012-11-08 833 struct efx_nic *efx = netdev_priv(net_dev);
add724771 Ben Hutchings 2012-11-08 834 struct efx_channel *channel;
add724771 Ben Hutchings 2012-11-08 835 struct efx_filter_spec spec;
68bb399e6 Edward Cree 2016-05-26 836 struct flow_keys fk;
add724771 Ben Hutchings 2012-11-08 837 int rc;
add724771 Ben Hutchings 2012-11-08 838
faf8dcc12 Jon Cooper 2016-05-31 839 if (flow_id == RPS_FLOW_ID_INVALID)
faf8dcc12 Jon Cooper 2016-05-31 840 return -EINVAL;
faf8dcc12 Jon Cooper 2016-05-31 841
68bb399e6 Edward Cree 2016-05-26 @842 if (!skb_flow_dissect_flow_keys(skb, &fk, 0))
68bb399e6 Edward Cree 2016-05-26 843 return -EPROTONOSUPPORT;
add724771 Ben Hutchings 2012-11-08 844
68bb399e6 Edward Cree 2016-05-26 845 if (fk.basic.n_proto != htons(ETH_P_IP) && fk.basic.n_proto != htons(ETH_P_IPV6))
68bb399e6 Edward Cree 2016-05-26 846 return -EPROTONOSUPPORT;
68bb399e6 Edward Cree 2016-05-26 847 if (fk.control.flags & FLOW_DIS_IS_FRAGMENT)
c47b2d9d5 Ben Hutchings 2013-09-03 848 return -EPROTONOSUPPORT;
c47b2d9d5 Ben Hutchings 2013-09-03 849
c47b2d9d5 Ben Hutchings 2013-09-03 850 efx_filter_init_rx(&spec, EFX_FILTER_PRI_HINT,
c47b2d9d5 Ben Hutchings 2013-09-03 851 efx->rx_scatter ? EFX_FILTER_FLAG_RX_SCATTER : 0,
c47b2d9d5 Ben Hutchings 2013-09-03 852 rxq_index);
c47b2d9d5 Ben Hutchings 2013-09-03 853 spec.match_flags =
c47b2d9d5 Ben Hutchings 2013-09-03 854 EFX_FILTER_MATCH_ETHER_TYPE | EFX_FILTER_MATCH_IP_PROTO |
c47b2d9d5 Ben Hutchings 2013-09-03 855 EFX_FILTER_MATCH_LOC_HOST | EFX_FILTER_MATCH_LOC_PORT |
c47b2d9d5 Ben Hutchings 2013-09-03 856 EFX_FILTER_MATCH_REM_HOST | EFX_FILTER_MATCH_REM_PORT;
68bb399e6 Edward Cree 2016-05-26 857 spec.ether_type = fk.basic.n_proto;
68bb399e6 Edward Cree 2016-05-26 858 spec.ip_proto = fk.basic.ip_proto;
c47b2d9d5 Ben Hutchings 2013-09-03 859
68bb399e6 Edward Cree 2016-05-26 860 if (fk.basic.n_proto == htons(ETH_P_IP)) {
68bb399e6 Edward Cree 2016-05-26 861 spec.rem_host[0] = fk.addrs.v4addrs.src;
68bb399e6 Edward Cree 2016-05-26 862 spec.loc_host[0] = fk.addrs.v4addrs.dst;
c47b2d9d5 Ben Hutchings 2013-09-03 863 } else {
68bb399e6 Edward Cree 2016-05-26 864 memcpy(spec.rem_host, &fk.addrs.v6addrs.src, sizeof(struct in6_addr));
68bb399e6 Edward Cree 2016-05-26 865 memcpy(spec.loc_host, &fk.addrs.v6addrs.dst, sizeof(struct in6_addr));
c47b2d9d5 Ben Hutchings 2013-09-03 866 }
c47b2d9d5 Ben Hutchings 2013-09-03 867
68bb399e6 Edward Cree 2016-05-26 868 spec.rem_port = fk.ports.src;
68bb399e6 Edward Cree 2016-05-26 869 spec.loc_port = fk.ports.dst;
add724771 Ben Hutchings 2012-11-08 870
add724771 Ben Hutchings 2012-11-08 871 rc = efx->type->filter_rfs_insert(efx, &spec);
add724771 Ben Hutchings 2012-11-08 872 if (rc < 0)
add724771 Ben Hutchings 2012-11-08 873 return rc;
add724771 Ben Hutchings 2012-11-08 874
add724771 Ben Hutchings 2012-11-08 875 /* Remember this so we can check whether to expire the filter later */
faf8dcc12 Jon Cooper 2016-05-31 876 channel = efx_get_channel(efx, rxq_index);
faf8dcc12 Jon Cooper 2016-05-31 877 channel->rps_flow_id[rc] = flow_id;
add724771 Ben Hutchings 2012-11-08 878 ++channel->rfs_filters_added;
add724771 Ben Hutchings 2012-11-08 879
68bb399e6 Edward Cree 2016-05-26 880 if (spec.ether_type == htons(ETH_P_IP))
add724771 Ben Hutchings 2012-11-08 881 netif_info(efx, rx_status, efx->net_dev,
add724771 Ben Hutchings 2012-11-08 882 "steering %s %pI4:%u:%pI4:%u to queue %u [flow %u filter %d]\n",
c47b2d9d5 Ben Hutchings 2013-09-03 883 (spec.ip_proto == IPPROTO_TCP) ? "TCP" : "UDP",
68bb399e6 Edward Cree 2016-05-26 884 spec.rem_host, ntohs(spec.rem_port), spec.loc_host,
68bb399e6 Edward Cree 2016-05-26 885 ntohs(spec.loc_port), rxq_index, flow_id, rc);
c47b2d9d5 Ben Hutchings 2013-09-03 886 else
c47b2d9d5 Ben Hutchings 2013-09-03 887 netif_info(efx, rx_status, efx->net_dev,
c47b2d9d5 Ben Hutchings 2013-09-03 888 "steering %s [%pI6]:%u:[%pI6]:%u to queue %u [flow %u filter %d]\n",
c47b2d9d5 Ben Hutchings 2013-09-03 889 (spec.ip_proto == IPPROTO_TCP) ? "TCP" : "UDP",
68bb399e6 Edward Cree 2016-05-26 890 spec.rem_host, ntohs(spec.rem_port), spec.loc_host,
68bb399e6 Edward Cree 2016-05-26 891 ntohs(spec.loc_port), rxq_index, flow_id, rc);
add724771 Ben Hutchings 2012-11-08 892
add724771 Ben Hutchings 2012-11-08 893 return rc;
add724771 Ben Hutchings 2012-11-08 894 }
add724771 Ben Hutchings 2012-11-08 895
:::::: The code at line 842 was first introduced by commit
:::::: 68bb399e656f244d3d173a20a8280c167632fca8 sfc: use flow dissector helpers for aRFS
:::::: TO: Edward Cree <ecree@...arflare.com>
:::::: CC: David S. Miller <davem@...emloft.net>
---
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