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sfc: use a semaphore to lock farch filters too
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With this change, the spinlock efx->filter_lock is no longer used and is
 thus removed.

Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Edward Cree authored and David S. Miller committed Mar 27, 2018
1 parent c2bebe3 commit fc7a6c2
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Showing 2 changed files with 33 additions and 36 deletions.
67 changes: 33 additions & 34 deletions drivers/net/ethernet/sfc/farch.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1878,6 +1878,7 @@ struct efx_farch_filter_table {
};

struct efx_farch_filter_state {
struct rw_semaphore lock; /* Protects table contents */
struct efx_farch_filter_table table[EFX_FARCH_FILTER_TABLE_COUNT];
};

Expand Down Expand Up @@ -2397,9 +2398,13 @@ s32 efx_farch_filter_insert(struct efx_nic *efx,
if (rc)
return rc;

down_write(&state->lock);

table = &state->table[efx_farch_filter_spec_table_id(&spec)];
if (table->size == 0)
return -EINVAL;
if (table->size == 0) {
rc = -EINVAL;
goto out_unlock;
}

netif_vdbg(efx, hw, efx->net_dev,
"%s: type %d search_limit=%d", __func__, spec.type,
Expand All @@ -2412,8 +2417,6 @@ s32 efx_farch_filter_insert(struct efx_nic *efx,
EFX_FARCH_FILTER_MC_DEF - EFX_FARCH_FILTER_UC_DEF);
rep_index = spec.type - EFX_FARCH_FILTER_UC_DEF;
ins_index = rep_index;

spin_lock_bh(&efx->filter_lock);
} else {
/* Search concurrently for
* (1) a filter to be replaced (rep_index): any filter
Expand Down Expand Up @@ -2443,8 +2446,6 @@ s32 efx_farch_filter_insert(struct efx_nic *efx,
ins_index = -1;
depth = 1;

spin_lock_bh(&efx->filter_lock);

for (;;) {
if (!test_bit(i, table->used_bitmap)) {
if (ins_index < 0)
Expand All @@ -2463,7 +2464,7 @@ s32 efx_farch_filter_insert(struct efx_nic *efx,
/* Case (b) */
if (ins_index < 0) {
rc = -EBUSY;
goto out;
goto out_unlock;
}
rep_index = -1;
break;
Expand All @@ -2483,11 +2484,11 @@ s32 efx_farch_filter_insert(struct efx_nic *efx,

if (spec.priority == saved_spec->priority && !replace_equal) {
rc = -EEXIST;
goto out;
goto out_unlock;
}
if (spec.priority < saved_spec->priority) {
rc = -EPERM;
goto out;
goto out_unlock;
}
if (saved_spec->priority == EFX_FILTER_PRI_AUTO ||
saved_spec->flags & EFX_FILTER_FLAG_RX_OVER_AUTO)
Expand Down Expand Up @@ -2528,8 +2529,8 @@ s32 efx_farch_filter_insert(struct efx_nic *efx,
__func__, spec.type, ins_index, spec.dmaq_id);
rc = efx_farch_filter_make_id(&spec, ins_index);

out:
spin_unlock_bh(&efx->filter_lock);
out_unlock:
up_write(&state->lock);
return rc;
}

Expand Down Expand Up @@ -2604,11 +2605,11 @@ int efx_farch_filter_remove_safe(struct efx_nic *efx,
filter_idx = efx_farch_filter_id_index(filter_id);
if (filter_idx >= table->size)
return -ENOENT;
down_write(&state->lock);
spec = &table->spec[filter_idx];

spin_lock_bh(&efx->filter_lock);
rc = efx_farch_filter_remove(efx, table, filter_idx, priority);
spin_unlock_bh(&efx->filter_lock);
up_write(&state->lock);

return rc;
}
Expand All @@ -2622,30 +2623,28 @@ int efx_farch_filter_get_safe(struct efx_nic *efx,
struct efx_farch_filter_table *table;
struct efx_farch_filter_spec *spec;
unsigned int filter_idx;
int rc;
int rc = -ENOENT;

down_read(&state->lock);

table_id = efx_farch_filter_id_table_id(filter_id);
if ((unsigned int)table_id >= EFX_FARCH_FILTER_TABLE_COUNT)
return -ENOENT;
goto out_unlock;
table = &state->table[table_id];

filter_idx = efx_farch_filter_id_index(filter_id);
if (filter_idx >= table->size)
return -ENOENT;
goto out_unlock;
spec = &table->spec[filter_idx];

spin_lock_bh(&efx->filter_lock);

if (test_bit(filter_idx, table->used_bitmap) &&
spec->priority == priority) {
efx_farch_filter_to_gen_spec(spec_buf, spec);
rc = 0;
} else {
rc = -ENOENT;
}

spin_unlock_bh(&efx->filter_lock);

out_unlock:
up_read(&state->lock);
return rc;
}

Expand All @@ -2658,13 +2657,13 @@ efx_farch_filter_table_clear(struct efx_nic *efx,
struct efx_farch_filter_table *table = &state->table[table_id];
unsigned int filter_idx;

spin_lock_bh(&efx->filter_lock);
down_write(&state->lock);
for (filter_idx = 0; filter_idx < table->size; ++filter_idx) {
if (table->spec[filter_idx].priority != EFX_FILTER_PRI_AUTO)
efx_farch_filter_remove(efx, table,
filter_idx, priority);
}
spin_unlock_bh(&efx->filter_lock);
up_write(&state->lock);
}

int efx_farch_filter_clear_rx(struct efx_nic *efx,
Expand All @@ -2688,7 +2687,7 @@ u32 efx_farch_filter_count_rx_used(struct efx_nic *efx,
unsigned int filter_idx;
u32 count = 0;

spin_lock_bh(&efx->filter_lock);
down_read(&state->lock);

for (table_id = EFX_FARCH_FILTER_TABLE_RX_IP;
table_id <= EFX_FARCH_FILTER_TABLE_RX_DEF;
Expand All @@ -2701,7 +2700,7 @@ u32 efx_farch_filter_count_rx_used(struct efx_nic *efx,
}
}

spin_unlock_bh(&efx->filter_lock);
up_read(&state->lock);

return count;
}
Expand All @@ -2716,7 +2715,7 @@ s32 efx_farch_filter_get_rx_ids(struct efx_nic *efx,
unsigned int filter_idx;
s32 count = 0;

spin_lock_bh(&efx->filter_lock);
down_read(&state->lock);

for (table_id = EFX_FARCH_FILTER_TABLE_RX_IP;
table_id <= EFX_FARCH_FILTER_TABLE_RX_DEF;
Expand All @@ -2735,7 +2734,7 @@ s32 efx_farch_filter_get_rx_ids(struct efx_nic *efx,
}
}
out:
spin_unlock_bh(&efx->filter_lock);
up_read(&state->lock);

return count;
}
Expand All @@ -2749,7 +2748,7 @@ void efx_farch_filter_table_restore(struct efx_nic *efx)
efx_oword_t filter;
unsigned int filter_idx;

spin_lock_bh(&efx->filter_lock);
down_write(&state->lock);

for (table_id = 0; table_id < EFX_FARCH_FILTER_TABLE_COUNT; table_id++) {
table = &state->table[table_id];
Expand All @@ -2770,7 +2769,7 @@ void efx_farch_filter_table_restore(struct efx_nic *efx)
efx_farch_filter_push_rx_config(efx);
efx_farch_filter_push_tx_limits(efx);

spin_unlock_bh(&efx->filter_lock);
up_write(&state->lock);
}

void efx_farch_filter_table_remove(struct efx_nic *efx)
Expand Down Expand Up @@ -2864,7 +2863,7 @@ void efx_farch_filter_update_rx_scatter(struct efx_nic *efx)
efx_oword_t filter;
unsigned int filter_idx;

spin_lock_bh(&efx->filter_lock);
down_write(&state->lock);

for (table_id = EFX_FARCH_FILTER_TABLE_RX_IP;
table_id <= EFX_FARCH_FILTER_TABLE_RX_DEF;
Expand Down Expand Up @@ -2896,7 +2895,7 @@ void efx_farch_filter_update_rx_scatter(struct efx_nic *efx)

efx_farch_filter_push_rx_config(efx);

spin_unlock_bh(&efx->filter_lock);
up_write(&state->lock);
}

#ifdef CONFIG_RFS_ACCEL
Expand All @@ -2908,7 +2907,7 @@ bool efx_farch_filter_rfs_expire_one(struct efx_nic *efx, u32 flow_id,
struct efx_farch_filter_table *table;
bool ret = false;

spin_lock_bh(&efx->filter_lock);
down_write(&state->lock);
table = &state->table[EFX_FARCH_FILTER_TABLE_RX_IP];
if (test_bit(index, table->used_bitmap) &&
table->spec[index].priority == EFX_FILTER_PRI_HINT &&
Expand All @@ -2918,7 +2917,7 @@ bool efx_farch_filter_rfs_expire_one(struct efx_nic *efx, u32 flow_id,
ret = true;
}

spin_unlock_bh(&efx->filter_lock);
up_write(&state->lock);
return ret;
}

Expand Down
2 changes: 0 additions & 2 deletions drivers/net/ethernet/sfc/net_driver.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -844,7 +844,6 @@ struct efx_rss_context {
* @loopback_modes: Supported loopback mode bitmask
* @loopback_selftest: Offline self-test private state
* @filter_sem: Filter table rw_semaphore, protects existence of @filter_state
* @filter_lock: Filter table lock, for mere content changes
* @filter_state: Architecture-dependent filter table state
* @rps_mutex: Protects RPS state of all channels
* @rps_expire_channel: Next channel to check for expiry
Expand Down Expand Up @@ -998,7 +997,6 @@ struct efx_nic {
void *loopback_selftest;

struct rw_semaphore filter_sem;
spinlock_t filter_lock;
void *filter_state;
#ifdef CONFIG_RFS_ACCEL
struct mutex rps_mutex;
Expand Down

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