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authorSteven <sluong@cisco.com>2018-03-26 21:52:11 -0700
committerDamjan Marion <dmarion.lists@gmail.com>2018-03-27 16:03:59 +0000
commit18c0f229cec4695cf77a0e3a9033d2ff0d1e085a (patch)
tree625838d9ef41b98d258bb2bf31ec04b58ade8dc2 /src/vnet/bonding/device.c
parented76ee24dfe76fb9400470a4efb3871acd37cad9 (diff)
bond: coverity woes
coverity complains about statements in function A function A { x % vec_len (y) } because vec_len (y) is a macro and may return 0 if the pointer y is null. But coverity fails to realize the same statement vec_len (y) was already invoked and checked in the caller of function A and punt if vec_len (y) is 0. We can fix the coverity warning and shave off a few cpu cycles by caching the result of vec_len (y) and pass it around to avoid calling vec_len (y) again in multiple places. Change-Id: I095166373abd3af3859646f860ee97c52f12fb50 Signed-off-by: Steven <sluong@cisco.com>
Diffstat (limited to 'src/vnet/bonding/device.c')
-rw-r--r--src/vnet/bonding/device.c57
1 files changed, 31 insertions, 26 deletions
diff --git a/src/vnet/bonding/device.c b/src/vnet/bonding/device.c
index cebfd694ac6..d4aa4a7fd31 100644
--- a/src/vnet/bonding/device.c
+++ b/src/vnet/bonding/device.c
@@ -98,7 +98,8 @@ bond_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
static inline u32
bond_load_balance_broadcast (vlib_main_t * vm, vlib_node_runtime_t * node,
- bond_if_t * bif, vlib_buffer_t * b0)
+ bond_if_t * bif, vlib_buffer_t * b0,
+ uword slave_count)
{
vnet_main_t *vnm = vnet_get_main ();
vlib_buffer_t *c0;
@@ -108,7 +109,7 @@ bond_load_balance_broadcast (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_frame_t *f;
- for (i = 1; i < vec_len (bif->active_slaves); i++)
+ for (i = 1; i < slave_count; i++)
{
sw_if_index = *vec_elt_at_index (bif->active_slaves, i);
f = vnet_get_frame_to_sw_interface (vnm, sw_if_index);
@@ -129,7 +130,7 @@ bond_load_balance_broadcast (vlib_main_t * vm, vlib_node_runtime_t * node,
static inline u32
bond_load_balance_l2 (vlib_main_t * vm, vlib_node_runtime_t * node,
- bond_if_t * bif, vlib_buffer_t * b0)
+ bond_if_t * bif, vlib_buffer_t * b0, uword slave_count)
{
ethernet_header_t *eth = (ethernet_header_t *) vlib_buffer_get_current (b0);
u32 a = 0, b = 0, c = 0, t1, t2;
@@ -146,7 +147,7 @@ bond_load_balance_l2 (vlib_main_t * vm, vlib_node_runtime_t * node,
hash_v3_mix32 (a, b, c);
hash_v3_finalize32 (a, b, c);
- return c % vec_len (bif->active_slaves);
+ return c % slave_count;
}
static inline u16 *
@@ -174,7 +175,7 @@ bond_locate_ethertype (ethernet_header_t * eth)
static inline u32
bond_load_balance_l23 (vlib_main_t * vm, vlib_node_runtime_t * node,
- bond_if_t * bif, vlib_buffer_t * b0)
+ bond_if_t * bif, vlib_buffer_t * b0, uword slave_count)
{
ethernet_header_t *eth = (ethernet_header_t *) vlib_buffer_get_current (b0);
u8 ip_version;
@@ -186,7 +187,7 @@ bond_load_balance_l23 (vlib_main_t * vm, vlib_node_runtime_t * node,
if ((ethertype != htons (ETHERNET_TYPE_IP4)) &&
(ethertype != htons (ETHERNET_TYPE_IP6)))
- return (bond_load_balance_l2 (vm, node, bif, b0));
+ return (bond_load_balance_l2 (vm, node, bif, b0, slave_count));
ip4 = (ip4_header_t *) (ethertype_p + 1);
ip_version = (ip4->ip_version_and_header_length >> 4);
@@ -209,7 +210,7 @@ bond_load_balance_l23 (vlib_main_t * vm, vlib_node_runtime_t * node,
hash_v3_mix32 (a, b, c);
hash_v3_finalize32 (a, b, c);
- return c % vec_len (bif->active_slaves);
+ return c % slave_count;
}
else if (ip_version == 0x6)
{
@@ -225,14 +226,14 @@ bond_load_balance_l23 (vlib_main_t * vm, vlib_node_runtime_t * node,
c = (ip6->dst_address.as_u64[0] ^ ip6->dst_address.as_u64[1]);
hash_mix64 (a, b, c);
- return c % vec_len (bif->active_slaves);
+ return c % slave_count;
}
- return (bond_load_balance_l2 (vm, node, bif, b0));
+ return (bond_load_balance_l2 (vm, node, bif, b0, slave_count));
}
static inline u32
bond_load_balance_l34 (vlib_main_t * vm, vlib_node_runtime_t * node,
- bond_if_t * bif, vlib_buffer_t * b0)
+ bond_if_t * bif, vlib_buffer_t * b0, uword slave_count)
{
ethernet_header_t *eth = (ethernet_header_t *) vlib_buffer_get_current (b0);
u8 ip_version;
@@ -245,7 +246,7 @@ bond_load_balance_l34 (vlib_main_t * vm, vlib_node_runtime_t * node,
if ((ethertype != htons (ETHERNET_TYPE_IP4)) &&
(ethertype != htons (ETHERNET_TYPE_IP6)))
- return (bond_load_balance_l2 (vm, node, bif, b0));
+ return (bond_load_balance_l2 (vm, node, bif, b0, slave_count));
ip4 = (ip4_header_t *) (ethertype_p + 1);
ip_version = (ip4->ip_version_and_header_length >> 4);
@@ -266,7 +267,7 @@ bond_load_balance_l34 (vlib_main_t * vm, vlib_node_runtime_t * node,
hash_v3_mix32 (a, b, c);
hash_v3_finalize32 (a, b, c);
- return c % vec_len (bif->active_slaves);
+ return c % slave_count;
}
else if (ip_version == 0x6)
{
@@ -300,19 +301,20 @@ bond_load_balance_l34 (vlib_main_t * vm, vlib_node_runtime_t * node,
c = (t2 << 16) | t1;
hash_mix64 (a, b, c);
- return c % vec_len (bif->active_slaves);
+ return c % slave_count;
}
- return (bond_load_balance_l2 (vm, node, bif, b0));
+ return (bond_load_balance_l2 (vm, node, bif, b0, slave_count));
}
static inline u32
bond_load_balance_round_robin (vlib_main_t * vm,
vlib_node_runtime_t * node,
- bond_if_t * bif, vlib_buffer_t * b0)
+ bond_if_t * bif, vlib_buffer_t * b0,
+ uword slave_count)
{
bif->lb_rr_last_index++;
- bif->lb_rr_last_index %= vec_len (bif->active_slaves);
+ bif->lb_rr_last_index %= slave_count;
return bif->lb_rr_last_index;
}
@@ -320,7 +322,8 @@ bond_load_balance_round_robin (vlib_main_t * vm,
static inline u32
bond_load_balance_active_backup (vlib_main_t * vm,
vlib_node_runtime_t * node,
- bond_if_t * bif, vlib_buffer_t * b0)
+ bond_if_t * bif, vlib_buffer_t * b0,
+ uword slave_count)
{
/* First interface is the active, the rest is backup */
return 0;
@@ -354,6 +357,7 @@ bond_tx_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
u32 *to_next;
u32 sif_if_index, sif_if_index1, sif_if_index2, sif_if_index3;
vlib_frame_t *f;
+ uword slave_count;
if (PREDICT_FALSE (bif->admin_up == 0))
{
@@ -368,7 +372,8 @@ bond_tx_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
}
clib_spinlock_lock_if_init (&bif->lockp);
- if (PREDICT_FALSE (vec_len (bif->active_slaves) == 0))
+ slave_count = vec_len (bif->active_slaves);
+ if (PREDICT_FALSE (slave_count == 0))
{
bi0 = from[0];
b0 = vlib_get_buffer (vm, bi0);
@@ -388,8 +393,8 @@ bond_tx_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
return frame->n_vectors;
}
- vec_validate_aligned (bif->per_thread_info[thread_index].frame,
- vec_len (bif->active_slaves), CLIB_CACHE_LINE_BYTES);
+ vec_validate_aligned (bif->per_thread_info[thread_index].frame, slave_count,
+ CLIB_CACHE_LINE_BYTES);
/* Number of buffers / pkts */
n_left_from = frame->n_vectors;
@@ -441,16 +446,16 @@ bond_tx_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
port =
(bond_load_balance_table[bif->lb]).load_balance (vm, node, bif,
- b0);
+ b0, slave_count);
port1 =
(bond_load_balance_table[bif->lb]).load_balance (vm, node, bif,
- b1);
+ b1, slave_count);
port2 =
(bond_load_balance_table[bif->lb]).load_balance (vm, node, bif,
- b2);
+ b2, slave_count);
port3 =
(bond_load_balance_table[bif->lb]).load_balance (vm, node, bif,
- b3);
+ b3, slave_count);
sif_if_index = *vec_elt_at_index (bif->active_slaves, port);
sif_if_index1 = *vec_elt_at_index (bif->active_slaves, port1);
@@ -579,7 +584,7 @@ bond_tx_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
port =
(bond_load_balance_table[bif->lb]).load_balance (vm, node, bif,
- b0);
+ b0, slave_count);
sif_if_index = *vec_elt_at_index (bif->active_slaves, port);
vnet_buffer (b0)->sw_if_index[VLIB_TX] = sif_if_index;
if (bif->per_thread_info[thread_index].frame[port] == 0)
@@ -607,7 +612,7 @@ bond_tx_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
}
}
- for (port = 0; port < vec_len (bif->active_slaves); port++)
+ for (port = 0; port < slave_count; port++)
{
f = bif->per_thread_info[thread_index].frame[port];
if (f == 0)