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Commit b20ff726 authored by Rahul Lakkireddy's avatar Rahul Lakkireddy Committed by David S. Miller
Browse files

cxgb4: add support for drop and redirect actions 



Add support for dropping matched packets in hardware.  Also add support
for re-directing matched packets to a specified port in hardware.

Signed-off-by: default avatarRahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Signed-off-by: default avatarHariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d8931847

drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_u32.c

+71 −0
Original line number Diff line number Diff line
@@ -32,6 +32,9 @@ 
 * SOFTWARE.

 */



#include <net/tc_act/tc_gact.h>

#include <net/tc_act/tc_mirred.h>



#include "cxgb4.h"

#include "cxgb4_tc_u32_parse.h"

#include "cxgb4_tc_u32.h"
@@ -82,6 +85,67 @@ static int fill_match_fields(struct adapter *adap, 
	return 0;

}



/* Fill ch_filter_specification with parsed action. */

static int fill_action_fields(struct adapter *adap,

			      struct ch_filter_specification *fs,

			      struct tc_cls_u32_offload *cls)

{

	unsigned int num_actions = 0;

	const struct tc_action *a;

	struct tcf_exts *exts;

	LIST_HEAD(actions);



	exts = cls->knode.exts;

	if (tc_no_actions(exts))

		return -EINVAL;



	tcf_exts_to_list(exts, &actions);

	list_for_each_entry(a, &actions, list) {

		/* Don't allow more than one action per rule. */

		if (num_actions)

			return -EINVAL;



		/* Drop in hardware. */

		if (is_tcf_gact_shot(a)) {

			fs->action = FILTER_DROP;

			num_actions++;

			continue;

		}



		/* Re-direct to specified port in hardware. */

		if (is_tcf_mirred_redirect(a)) {

			struct net_device *n_dev;

			unsigned int i, index;

			bool found = false;



			index = tcf_mirred_ifindex(a);

			for_each_port(adap, i) {

				n_dev = adap->port[i];

				if (index == n_dev->ifindex) {

					fs->action = FILTER_SWITCH;

					fs->eport = i;

					found = true;

					break;

				}

			}



			/* Interface doesn't belong to any port of

			 * the underlying hardware.

			 */

			if (!found)

				return -EINVAL;



			num_actions++;

			continue;

		}



		/* Un-supported action. */

		return -EINVAL;

	}



	return 0;

}



int cxgb4_config_knode(struct net_device *dev, __be16 protocol,

		       struct tc_cls_u32_offload *cls)

{
@@ -234,6 +298,13 @@ int cxgb4_config_knode(struct net_device *dev, __be16 protocol, 
	if (ret)

		goto out;



	/* Fill ch_filter_specification action fields to be shipped to

	 * hardware.

	 */

	ret = fill_action_fields(adapter, &fs, cls);

	if (ret)

		goto out;



	/* The filter spec has been completely built from the info

	 * provided from u32.  We now set some default fields in the

	 * spec for sanity.