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sfc: introduce pedit add actions on the ipv4 ttl field

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Introduce pedit add actions and use it to achieve decrement ttl offload.
Decrement ttl can be achieved by adding 0xff to the ttl field.

Co-developed-by: Edward Cree <ecree.xilinx@gmail.com>
Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Signed-off-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pieter Jansen van Vuuren 2023-08-24 12:28:41 +01:00 committed by David S. Miller
parent 9dbc8d2b9a
commit 64848f062e
1 changed files with 46 additions and 0 deletions
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46
drivers/net/ethernet/sfc/tc.c
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@ -1054,6 +1054,47 @@ static int efx_tc_complete_mac_mangle(struct efx_nic *efx,
return 0;
}
static int efx_tc_pedit_add(struct efx_nic *efx, struct efx_tc_action_set *act,
const struct flow_action_entry *fa,
struct netlink_ext_ack *extack)
{
switch (fa->mangle.htype) {
case FLOW_ACT_MANGLE_HDR_TYPE_IP4:
switch (fa->mangle.offset) {
case offsetof(struct iphdr, ttl):
/* check that pedit applies to ttl only */
if (fa->mangle.mask != ~EFX_TC_HDR_TYPE_TTL_MASK)
break;
/* Adding 0xff is equivalent to decrementing the ttl.
* Other added values are not supported.
*/
if ((fa->mangle.val & EFX_TC_HDR_TYPE_TTL_MASK) != U8_MAX)
break;
/* check that we do not decrement ttl twice */
if (!efx_tc_flower_action_order_ok(act,
EFX_TC_AO_DEC_TTL)) {
NL_SET_ERR_MSG_MOD(extack, "Unsupported: multiple dec ttl");
return -EOPNOTSUPP;
}
act->do_ttl_dec = 1;
return 0;
default:
break;
}
break;
default:
break;
}
NL_SET_ERR_MSG_FMT_MOD(extack,
"Unsupported: ttl add action type %x %x %x/%x",
fa->mangle.htype, fa->mangle.offset,
fa->mangle.val, fa->mangle.mask);
return -EOPNOTSUPP;
}
/**
* efx_tc_mangle() - handle a single 32-bit (or less) pedit
* @efx: NIC we're installing a flow rule on
@ -2014,6 +2055,11 @@ static int efx_tc_flower_replace(struct efx_nic *efx,
act->vlan_proto[act->vlan_push] = fa->vlan.proto;
act->vlan_push++;
break;
case FLOW_ACTION_ADD:
rc = efx_tc_pedit_add(efx, act, fa, extack);
if (rc < 0)
goto release;
break;
case FLOW_ACTION_MANGLE:
rc = efx_tc_mangle(efx, act, fa, &mung, extack, &match);
if (rc < 0)