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cxgb4: add support for drop and redirect actions

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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: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Rahul Lakkireddy 2016-09-20 17:13:10 +05:30 committed by David S. Miller
parent d893184748
commit b20ff726fa
1 changed files with 71 additions and 0 deletions
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71
drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_u32.c
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@ -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.