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Message-ID: <1377636387.13272.82.camel@bwh-desktop.uk.level5networks.com>
Date: Tue, 27 Aug 2013 21:46:27 +0100
From: Ben Hutchings <bhutchings@...arflare.com>
To: David Miller <davem@...emloft.net>
CC: <netdev@...r.kernel.org>, <linux-net-drivers@...arflare.com>
Subject: [PATCH net-next 09/16] sfc: Refactor Falcon-arch search limit reset
Currently every call to efx_farch_filter_table_clear_entry() is
shortly followed by a conditional reset of the table limits. The new
limits (0) are not pushed to hardware until the next filter insertion.
Move both the reset and the hardware reconfiguration into
efx_farch_filter_table_clear_entry(), and add an explanatory comment.
Also, make consistent use of the term 'search limit' for the maximum
number of probes the NIC must make when searching for a filter of a
particular type.
Signed-off-by: Ben Hutchings <bhutchings@...arflare.com>
---
drivers/net/ethernet/sfc/filter.c | 59 ++++++++++++++++++++-------------------
1 file changed, 30 insertions(+), 29 deletions(-)
diff --git a/drivers/net/ethernet/sfc/filter.c b/drivers/net/ethernet/sfc/filter.c
index 29986d3..ad66376 100644
--- a/drivers/net/ethernet/sfc/filter.c
+++ b/drivers/net/ethernet/sfc/filter.c
@@ -22,7 +22,7 @@
#define EFX_FARCH_FILTER_CTL_SRCH_FUDGE_WILD 3
#define EFX_FARCH_FILTER_CTL_SRCH_FUDGE_FULL 1
-/* Hard maximum hop limit. Hardware will time-out beyond 200-something.
+/* Hard maximum search limit. Hardware will time-out beyond 200-something.
* We also need to avoid infinite loops in efx_farch_filter_search() when the
* table is full.
*/
@@ -74,7 +74,7 @@ struct efx_farch_filter_table {
unsigned used; /* number currently used */
unsigned long *used_bitmap;
struct efx_farch_filter_spec *spec;
- unsigned search_depth[EFX_FARCH_FILTER_TYPE_COUNT];
+ unsigned search_limit[EFX_FARCH_FILTER_TYPE_COUNT];
};
struct efx_farch_filter_state {
@@ -129,12 +129,6 @@ efx_farch_filter_spec_table_id(const struct efx_farch_filter_spec *spec)
return (spec->type >> 2) + ((spec->flags & EFX_FILTER_FLAG_TX) ? 2 : 0);
}
-static void
-efx_farch_filter_table_reset_search_depth(struct efx_farch_filter_table *table)
-{
- memset(table->search_depth, 0, sizeof(table->search_depth));
-}
-
static void efx_farch_filter_push_rx_config(struct efx_nic *efx)
{
struct efx_farch_filter_state *state = efx->filter_state;
@@ -145,27 +139,27 @@ static void efx_farch_filter_push_rx_config(struct efx_nic *efx)
table = &state->table[EFX_FARCH_FILTER_TABLE_RX_IP];
EFX_SET_OWORD_FIELD(filter_ctl, FRF_BZ_TCP_FULL_SRCH_LIMIT,
- table->search_depth[EFX_FARCH_FILTER_TCP_FULL] +
+ table->search_limit[EFX_FARCH_FILTER_TCP_FULL] +
EFX_FARCH_FILTER_CTL_SRCH_FUDGE_FULL);
EFX_SET_OWORD_FIELD(filter_ctl, FRF_BZ_TCP_WILD_SRCH_LIMIT,
- table->search_depth[EFX_FARCH_FILTER_TCP_WILD] +
+ table->search_limit[EFX_FARCH_FILTER_TCP_WILD] +
EFX_FARCH_FILTER_CTL_SRCH_FUDGE_WILD);
EFX_SET_OWORD_FIELD(filter_ctl, FRF_BZ_UDP_FULL_SRCH_LIMIT,
- table->search_depth[EFX_FARCH_FILTER_UDP_FULL] +
+ table->search_limit[EFX_FARCH_FILTER_UDP_FULL] +
EFX_FARCH_FILTER_CTL_SRCH_FUDGE_FULL);
EFX_SET_OWORD_FIELD(filter_ctl, FRF_BZ_UDP_WILD_SRCH_LIMIT,
- table->search_depth[EFX_FARCH_FILTER_UDP_WILD] +
+ table->search_limit[EFX_FARCH_FILTER_UDP_WILD] +
EFX_FARCH_FILTER_CTL_SRCH_FUDGE_WILD);
table = &state->table[EFX_FARCH_FILTER_TABLE_RX_MAC];
if (table->size) {
EFX_SET_OWORD_FIELD(
filter_ctl, FRF_CZ_ETHERNET_FULL_SEARCH_LIMIT,
- table->search_depth[EFX_FARCH_FILTER_MAC_FULL] +
+ table->search_limit[EFX_FARCH_FILTER_MAC_FULL] +
EFX_FARCH_FILTER_CTL_SRCH_FUDGE_FULL);
EFX_SET_OWORD_FIELD(
filter_ctl, FRF_CZ_ETHERNET_WILDCARD_SEARCH_LIMIT,
- table->search_depth[EFX_FARCH_FILTER_MAC_WILD] +
+ table->search_limit[EFX_FARCH_FILTER_MAC_WILD] +
EFX_FARCH_FILTER_CTL_SRCH_FUDGE_WILD);
}
@@ -221,11 +215,11 @@ static void efx_farch_filter_push_tx_limits(struct efx_nic *efx)
if (table->size) {
EFX_SET_OWORD_FIELD(
tx_cfg, FRF_CZ_TX_ETH_FILTER_FULL_SEARCH_RANGE,
- table->search_depth[EFX_FARCH_FILTER_MAC_FULL] +
+ table->search_limit[EFX_FARCH_FILTER_MAC_FULL] +
EFX_FARCH_FILTER_CTL_SRCH_FUDGE_FULL);
EFX_SET_OWORD_FIELD(
tx_cfg, FRF_CZ_TX_ETH_FILTER_WILD_SEARCH_RANGE,
- table->search_depth[EFX_FARCH_FILTER_MAC_WILD] +
+ table->search_limit[EFX_FARCH_FILTER_MAC_WILD] +
EFX_FARCH_FILTER_CTL_SRCH_FUDGE_WILD);
}
@@ -633,8 +627,8 @@ s32 efx_filter_insert_filter(struct efx_nic *efx,
return -EINVAL;
netif_vdbg(efx, hw, efx->net_dev,
- "%s: type %d search_depth=%d", __func__, spec.type,
- table->search_depth[spec.type]);
+ "%s: type %d search_limit=%d", __func__, spec.type,
+ table->search_limit[spec.type]);
if (table->id == EFX_FARCH_FILTER_TABLE_RX_DEF) {
/* One filter spec per type */
@@ -664,7 +658,7 @@ s32 efx_filter_insert_filter(struct efx_nic *efx,
u32 key = efx_farch_filter_build(&filter, &spec);
unsigned int hash = efx_farch_filter_hash(key);
unsigned int incr = efx_farch_filter_increment(key);
- unsigned int max_rep_depth = table->search_depth[spec.type];
+ unsigned int max_rep_depth = table->search_limit[spec.type];
unsigned int max_ins_depth =
spec.priority <= EFX_FILTER_PRI_HINT ?
EFX_FARCH_FILTER_CTL_SRCH_HINT_MAX :
@@ -732,8 +726,8 @@ s32 efx_filter_insert_filter(struct efx_nic *efx,
if (table->id == EFX_FARCH_FILTER_TABLE_RX_DEF) {
efx_farch_filter_push_rx_config(efx);
} else {
- if (table->search_depth[spec.type] < depth) {
- table->search_depth[spec.type] = depth;
+ if (table->search_limit[spec.type] < depth) {
+ table->search_limit[spec.type] = depth;
if (spec.flags & EFX_FILTER_FLAG_TX)
efx_farch_filter_push_tx_limits(efx);
else
@@ -779,6 +773,21 @@ efx_farch_filter_table_clear_entry(struct efx_nic *efx,
efx_writeo(efx, &filter,
table->offset + table->step * filter_idx);
+
+ /* If this filter required a greater search depth than
+ * any other, the search limit for its type can now be
+ * decreased. However, it is hard to determine that
+ * unless the table has become completely empty - in
+ * which case, all its search limits can be set to 0.
+ */
+ if (unlikely(table->used == 0)) {
+ memset(table->search_limit, 0,
+ sizeof(table->search_limit));
+ if (table->id == EFX_FARCH_FILTER_TABLE_TX_MAC)
+ efx_farch_filter_push_tx_limits(efx);
+ else
+ efx_farch_filter_push_rx_config(efx);
+ }
}
}
@@ -817,8 +826,6 @@ int efx_filter_remove_id_safe(struct efx_nic *efx,
if (test_bit(filter_idx, table->used_bitmap) &&
spec->priority == priority) {
efx_farch_filter_table_clear_entry(efx, table, filter_idx);
- if (table->used == 0)
- efx_farch_filter_table_reset_search_depth(table);
rc = 0;
} else {
rc = -ENOENT;
@@ -885,14 +892,10 @@ efx_farch_filter_table_clear(struct efx_nic *efx,
unsigned int filter_idx;
spin_lock_bh(&efx->filter_lock);
-
for (filter_idx = 0; filter_idx < table->size; ++filter_idx)
if (table->spec[filter_idx].priority <= priority)
efx_farch_filter_table_clear_entry(efx, table,
filter_idx);
- if (table->used == 0)
- efx_farch_filter_table_reset_search_depth(table);
-
spin_unlock_bh(&efx->filter_lock);
}
@@ -1233,8 +1236,6 @@ bool __efx_filter_rfs_expire(struct efx_nic *efx, unsigned quota)
}
efx->rps_expire_index = stop;
- if (table->used == 0)
- efx_farch_filter_table_reset_search_depth(table);
spin_unlock_bh(&efx->filter_lock);
return true;
--
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.
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