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authorScott Feldman <sfeldma@gmail.com>2015-03-06 08:21:19 +0300
committerDavid S. Miller <davem@davemloft.net>2015-03-06 08:24:58 +0300
commit8e05fd7166c6123334b7a739a697d677747aa462 (patch)
tree92a66ecee7e1ff94f0314cd32e4fd65e2fd12741 /net/ipv4/fib_trie.c
parent448b128a14501543748514a4f9adedd3c0da2e85 (diff)
downloadlinux-8e05fd7166c6123334b7a739a697d677747aa462.tar.xz
fib: hook IPv4 fib for hardware offload
Call into the switchdev driver any time an IPv4 fib entry is added/modified/deleted from the kernel's FIB. The switchdev driver may or may not install the route to the offload device. In the case where the driver tries to install the route and something goes wrong (device's routing table is full, etc), then all of the offloaded routes will be flushed from the device, route forwarding falls back to the kernel, and no more routes are offloading. We can refine this logic later. For now, use the simplist model of offloading routes up to the point of failure, and then on failure, undo everything and mark IPv4 offloading disabled. Signed-off-by: Scott Feldman <sfeldma@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/fib_trie.c')
-rw-r--r--net/ipv4/fib_trie.c31
1 files changed, 30 insertions, 1 deletions
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index 2de43956c9d0..6544f1a0cfa1 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -79,6 +79,7 @@
#include <net/tcp.h>
#include <net/sock.h>
#include <net/ip_fib.h>
+#include <net/switchdev.h>
#include "fib_lookup.h"
#define MAX_STAT_DEPTH 32
@@ -1135,7 +1136,18 @@ int fib_table_insert(struct fib_table *tb, struct fib_config *cfg)
new_fa->fa_state = state & ~FA_S_ACCESSED;
new_fa->fa_slen = fa->fa_slen;
+ err = netdev_switch_fib_ipv4_add(key, plen, fi,
+ new_fa->fa_tos,
+ cfg->fc_type,
+ tb->tb_id);
+ if (err) {
+ netdev_switch_fib_ipv4_abort(fi);
+ kmem_cache_free(fn_alias_kmem, new_fa);
+ goto out;
+ }
+
hlist_replace_rcu(&fa->fa_list, &new_fa->fa_list);
+
alias_free_mem_rcu(fa);
fib_release_info(fi_drop);
@@ -1171,10 +1183,18 @@ int fib_table_insert(struct fib_table *tb, struct fib_config *cfg)
new_fa->fa_state = 0;
new_fa->fa_slen = slen;
+ /* (Optionally) offload fib entry to switch hardware. */
+ err = netdev_switch_fib_ipv4_add(key, plen, fi, tos,
+ cfg->fc_type, tb->tb_id);
+ if (err) {
+ netdev_switch_fib_ipv4_abort(fi);
+ goto out_free_new_fa;
+ }
+
/* Insert new entry to the list. */
err = fib_insert_alias(t, tp, l, new_fa, fa, key);
if (err)
- goto out_free_new_fa;
+ goto out_sw_fib_del;
if (!plen)
tb->tb_num_default++;
@@ -1185,6 +1205,8 @@ int fib_table_insert(struct fib_table *tb, struct fib_config *cfg)
succeeded:
return 0;
+out_sw_fib_del:
+ netdev_switch_fib_ipv4_del(key, plen, fi, tos, cfg->fc_type, tb->tb_id);
out_free_new_fa:
kmem_cache_free(fn_alias_kmem, new_fa);
out:
@@ -1456,6 +1478,9 @@ int fib_table_delete(struct fib_table *tb, struct fib_config *cfg)
if (!fa_to_delete)
return -ESRCH;
+ netdev_switch_fib_ipv4_del(key, plen, fa_to_delete->fa_info, tos,
+ cfg->fc_type, tb->tb_id);
+
rtmsg_fib(RTM_DELROUTE, htonl(key), fa_to_delete, plen, tb->tb_id,
&cfg->fc_nlinfo, 0);
@@ -1650,6 +1675,10 @@ backtrace:
struct fib_info *fi = fa->fa_info;
if (fi && (fi->fib_flags & RTNH_F_DEAD)) {
+ netdev_switch_fib_ipv4_del(n->key,
+ KEYLENGTH - fa->fa_slen,
+ fi, fa->fa_tos,
+ fa->fa_type, tb->tb_id);
hlist_del_rcu(&fa->fa_list);
fib_release_info(fa->fa_info);
alias_free_mem_rcu(fa);