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net: flow_offload: simplify hw stats check handling

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Make FLOW_ACTION_HW_STATS_DONT_CARE be all bits, rather than none, so that
 drivers and __flow_action_hw_stats_check can use simple bitwise checks.

Pre-fill all actions with DONT_CARE in flow_rule_alloc(), rather than
 relying on implicit semantics of zero from kzalloc, so that callers which
 don't configure action stats themselves (i.e. netfilter) get the correct
 behaviour by default.

Only the kernel's internal API semantics change; the TC uAPI is unaffected.

v4: move DONT_CARE setting to flow_rule_alloc() for robustness and simplicity.

v3: set DONT_CARE in nft and ct offload.

v2: rebased on net-next, removed RFC tags.

Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Edward Cree
2020-05-20 19:18:10 +01:00
committed by David S. Miller
parent df0651f8c0
commit 060b6381ef
3 changed files with 17 additions and 8 deletions
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11
include/net/flow_offload.h
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@@ -168,10 +168,11 @@ enum flow_action_hw_stats_bit {
FLOW_ACTION_HW_STATS_IMMEDIATE_BIT,
FLOW_ACTION_HW_STATS_DELAYED_BIT,
FLOW_ACTION_HW_STATS_DISABLED_BIT,
FLOW_ACTION_HW_STATS_NUM_BITS
};
enum flow_action_hw_stats {
FLOW_ACTION_HW_STATS_DONT_CARE = 0,
FLOW_ACTION_HW_STATS_IMMEDIATE =
BIT(FLOW_ACTION_HW_STATS_IMMEDIATE_BIT),
FLOW_ACTION_HW_STATS_DELAYED = BIT(FLOW_ACTION_HW_STATS_DELAYED_BIT),
@@ -179,6 +180,7 @@ enum flow_action_hw_stats {
FLOW_ACTION_HW_STATS_DELAYED,
FLOW_ACTION_HW_STATS_DISABLED =
BIT(FLOW_ACTION_HW_STATS_DISABLED_BIT),
FLOW_ACTION_HW_STATS_DONT_CARE = BIT(FLOW_ACTION_HW_STATS_NUM_BITS) - 1,
};
typedef void (*action_destr)(void *priv);
@@ -340,11 +342,12 @@ __flow_action_hw_stats_check(const struct flow_action *action,
return false;
action_entry = flow_action_first_entry_get(action);
if (action_entry->hw_stats == FLOW_ACTION_HW_STATS_DONT_CARE)
return true;
/* Zero is not a legal value for hw_stats, catch anyone passing it */
WARN_ON_ONCE(!action_entry->hw_stats);
if (!check_allow_bit &&
action_entry->hw_stats != FLOW_ACTION_HW_STATS_ANY) {
~action_entry->hw_stats & FLOW_ACTION_HW_STATS_ANY) {
NL_SET_ERR_MSG_MOD(extack, "Driver supports only default HW stats type \"any\"");
return false;
} else if (check_allow_bit &&