Commit 8803e150 authored by Ben Hutchings's avatar Ben Hutchings
Browse files

sfc: Add flag for stack-owned RX MAC filters 



MAC filters inserted on request from the stack (ndo_set_rx_mode)
should allow manual steering but not removal.  Currently we have a
special case for Siena's all-multicast and all-unicast MAC filters,
but on EF10 we need to allow for steering of precise MAC filters as
well.

The EFX_FILTER_FLAG_RX_STACK flag changes the behaviour of replacement
and removal requests:

- Replacement *of* a filter with this flag never clears the flag but
  does change steering and saved priority
- Replacement *by* a filter with this flag only sets the flag but does
  not change steering
- Removal with priority < EFX_FILTER_PRI_REQUIRED really resets RX
  steering and saved priority

This could support precise MAC filtering on Siena in future.

As a side-benefit, the default MAC filters are hidden from ethtool
until they are steered.

Signed-off-by: default avatarBen Hutchings <bhutchings@solarflare.com>
parent 14990a5d

drivers/net/ethernet/sfc/farch.c

+30 −17
Original line number Diff line number Diff line
@@ -2186,23 +2186,17 @@ efx_farch_filter_to_gen_spec(struct efx_filter_spec *gen_spec, 
}



static void

efx_farch_filter_reset_rx_def(struct efx_nic *efx, unsigned filter_idx)

efx_farch_filter_init_rx_for_stack(struct efx_nic *efx,

				   struct efx_farch_filter_spec *spec)

{

	struct efx_farch_filter_state *state = efx->filter_state;

	struct efx_farch_filter_table *table =

		&state->table[EFX_FARCH_FILTER_TABLE_RX_DEF];

	struct efx_farch_filter_spec *spec = &table->spec[filter_idx];



	/* If there's only one channel then disable RSS for non VF

	 * traffic, thereby allowing VFs to use RSS when the PF can't.

	 */

	spec->type = EFX_FARCH_FILTER_UC_DEF + filter_idx;

	spec->priority = EFX_FILTER_PRI_MANUAL;

	spec->flags = (EFX_FILTER_FLAG_RX |

	spec->priority = EFX_FILTER_PRI_REQUIRED;

	spec->flags = (EFX_FILTER_FLAG_RX | EFX_FILTER_FLAG_RX_STACK |

		       (efx->n_rx_channels > 1 ? EFX_FILTER_FLAG_RX_RSS : 0) |

		       (efx->rx_scatter ? EFX_FILTER_FLAG_RX_SCATTER : 0));

	spec->dmaq_id = 0;

	table->used_bitmap[0] |= 1 << filter_idx;

}



/* Build a filter entry and return its n-tuple key. */
@@ -2464,10 +2458,20 @@ s32 efx_farch_filter_insert(struct efx_nic *efx, 
			rc = -EEXIST;

			goto out;

		}

		if (spec.priority < saved_spec->priority) {

		if (spec.priority < saved_spec->priority &&

		    !(saved_spec->priority == EFX_FILTER_PRI_REQUIRED &&

		      saved_spec->flags & EFX_FILTER_FLAG_RX_STACK)) {

			rc = -EPERM;

			goto out;

		}

		if (spec.flags & EFX_FILTER_FLAG_RX_STACK) {

			/* Just make sure it won't be removed */

			saved_spec->flags |= EFX_FILTER_FLAG_RX_STACK;

			rc = 0;

			goto out;

		}

		/* Retain the RX_STACK flag */

		spec.flags |= saved_spec->flags & EFX_FILTER_FLAG_RX_STACK;

	}



	/* Insert the filter */
@@ -2517,6 +2521,7 @@ efx_farch_filter_table_clear_entry(struct efx_nic *efx, 
	static efx_oword_t filter;



	EFX_WARN_ON_PARANOID(!test_bit(filter_idx, table->used_bitmap));

	BUG_ON(table->offset == 0); /* can't clear MAC default filters */



	__clear_bit(filter_idx, table->used_bitmap);

	--table->used;
@@ -2550,9 +2555,8 @@ static int efx_farch_filter_remove(struct efx_nic *efx, 
	    spec->priority > priority)

		return -ENOENT;



	if (table->id == EFX_FARCH_FILTER_TABLE_RX_DEF) {

		/* RX default filters must always exist */

		efx_farch_filter_reset_rx_def(efx, filter_idx);

	if (spec->flags & EFX_FILTER_FLAG_RX_STACK) {

		efx_farch_filter_init_rx_for_stack(efx, spec);

		efx_farch_filter_push_rx_config(efx);

	} else {

		efx_farch_filter_table_clear_entry(efx, table, filter_idx);
@@ -2647,6 +2651,8 @@ void efx_farch_filter_clear_rx(struct efx_nic *efx, 
				     priority);

	efx_farch_filter_table_clear(efx, EFX_FARCH_FILTER_TABLE_RX_MAC,

				     priority);

	efx_farch_filter_table_clear(efx, EFX_FARCH_FILTER_TABLE_RX_DEF,

				     priority);

}



u32 efx_farch_filter_count_rx_used(struct efx_nic *efx,
@@ -2806,11 +2812,18 @@ int efx_farch_filter_table_probe(struct efx_nic *efx) 
			goto fail;

	}



	if (state->table[EFX_FARCH_FILTER_TABLE_RX_DEF].size) {

	table = &state->table[EFX_FARCH_FILTER_TABLE_RX_DEF];

	if (table->size) {

		/* RX default filters must always exist */

		struct efx_farch_filter_spec *spec;

		unsigned i;

		for (i = 0; i < EFX_FARCH_FILTER_SIZE_RX_DEF; i++)

			efx_farch_filter_reset_rx_def(efx, i);



		for (i = 0; i < EFX_FARCH_FILTER_SIZE_RX_DEF; i++) {

			spec = &table->spec[i];

			spec->type = EFX_FARCH_FILTER_UC_DEF + i;

			efx_farch_filter_init_rx_for_stack(efx, spec);

			__set_bit(i, table->used_bitmap);

		}

	}



	efx_farch_filter_push_rx_config(efx);

drivers/net/ethernet/sfc/filter.h

+7 −0
Original line number Diff line number Diff line
@@ -78,12 +78,19 @@ enum efx_filter_priority { 
 *	according to the indirection table.

 * @EFX_FILTER_FLAG_RX_SCATTER: Enable DMA scatter on the receiving

 *	queue.

 * @EFX_FILTER_FLAG_RX_STACK: Indicates a filter inserted for the

 *	network stack.  The filter must have a priority of

 *	%EFX_FILTER_PRI_REQUIRED.  It can be steered by a replacement

 *	request with priority %EFX_FILTER_PRI_MANUAL, and a removal

 *	request with priority %EFX_FILTER_PRI_MANUAL will reset the

 *	steering (but not remove the filter).

 * @EFX_FILTER_FLAG_RX: Filter is for RX

 * @EFX_FILTER_FLAG_TX: Filter is for TX

 */

enum efx_filter_flags {

	EFX_FILTER_FLAG_RX_RSS = 0x01,

	EFX_FILTER_FLAG_RX_SCATTER = 0x02,

	EFX_FILTER_FLAG_RX_STACK = 0x04,

	EFX_FILTER_FLAG_RX = 0x08,

	EFX_FILTER_FLAG_TX = 0x10,

};

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