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sfc: add decrement ttl by offloading set ipv4 ttl actions

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Offload pedit set ipv4 ttl field, where the ttl field has already been
matched and the new value is one less, by translating it to a decrement.

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 12:28:39 +01:00 committed by David S. Miller
parent 0c676503bd
commit 66f7288726
3 changed files with 79 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/net/ethernet/sfc/mae.c
View File

@ -1291,10 +1291,12 @@ int efx_mae_alloc_action_set(struct efx_nic *efx, struct efx_tc_action_set *act)
size_t outlen;
int rc;
MCDI_POPULATE_DWORD_3(inbuf, MAE_ACTION_SET_ALLOC_IN_FLAGS,
MCDI_POPULATE_DWORD_4(inbuf, MAE_ACTION_SET_ALLOC_IN_FLAGS,
MAE_ACTION_SET_ALLOC_IN_VLAN_PUSH, act->vlan_push,
MAE_ACTION_SET_ALLOC_IN_VLAN_POP, act->vlan_pop,
MAE_ACTION_SET_ALLOC_IN_DECAP, act->decap);
MAE_ACTION_SET_ALLOC_IN_DECAP, act->decap,
MAE_ACTION_SET_ALLOC_IN_DO_DECR_IP_TTL,
act->do_ttl_dec);
if (act->src_mac)
MCDI_SET_DWORD(inbuf, MAE_ACTION_SET_ALLOC_IN_SRC_MAC_ID,

75
drivers/net/ethernet/sfc/tc.c
View File

@ -31,6 +31,7 @@ enum efx_encap_type efx_tc_indr_netdev_type(struct net_device *net_dev)
return EFX_ENCAP_TYPE_NONE;
}
#define EFX_TC_HDR_TYPE_TTL_MASK ((u32)0xff)
#define EFX_EFV_PF NULL
/* Look up the representor information (efv) for a device.
* May return NULL for the PF (us), or an error pointer for a device that
@ -757,6 +758,7 @@ static const char *efx_tc_encap_type_name(enum efx_encap_type typ)
/* For details of action order constraints refer to SF-123102-TC-1§12.6.1 */
enum efx_tc_action_order {
EFX_TC_AO_DECAP,
EFX_TC_AO_DEC_TTL,
EFX_TC_AO_PEDIT_MAC_ADDRS,
EFX_TC_AO_VLAN_POP,
EFX_TC_AO_VLAN_PUSH,
@ -777,6 +779,10 @@ static bool efx_tc_flower_action_order_ok(const struct efx_tc_action_set *act,
*/
if (act->dst_mac || act->src_mac)
return false;
/* Decrementing ttl must not happen before DECAP */
if (act->do_ttl_dec)
return false;
fallthrough;
case EFX_TC_AO_VLAN_POP:
if (act->vlan_pop >= 2)
@ -803,6 +809,10 @@ static bool efx_tc_flower_action_order_ok(const struct efx_tc_action_set *act,
fallthrough;
case EFX_TC_AO_DELIVER:
return !act->deliver;
case EFX_TC_AO_DEC_TTL:
if (act->encap_md)
return false;
return !act->do_ttl_dec;
default:
/* Bad caller. Whatever they wanted to do, say they can't. */
WARN_ON_ONCE(1);
@ -1049,6 +1059,7 @@ static int efx_tc_complete_mac_mangle(struct efx_nic *efx,
* @fa: FLOW_ACTION_MANGLE action metadata
* @mung: accumulator for partial mangles
* @extack: netlink extended ack for reporting errors
* @match: original match used along with the mangle action
*
* Identify the fields written by a FLOW_ACTION_MANGLE, and record
* the partial mangle state in @mung. If this mangle completes an
@ -1059,10 +1070,12 @@ static int efx_tc_complete_mac_mangle(struct efx_nic *efx,
static int efx_tc_mangle(struct efx_nic *efx, struct efx_tc_action_set *act,
const struct flow_action_entry *fa,
struct efx_tc_mangler_state *mung,
struct netlink_ext_ack *extack)
struct netlink_ext_ack *extack,
struct efx_tc_match *match)
{
__le32 mac32;
__le16 mac16;
u8 tr_ttl;
switch (fa->mangle.htype) {
case FLOW_ACT_MANGLE_HDR_TYPE_ETH:
@ -1119,6 +1132,64 @@ static int efx_tc_mangle(struct efx_nic *efx, struct efx_tc_action_set *act,
return -EOPNOTSUPP;
}
break;
case FLOW_ACT_MANGLE_HDR_TYPE_IP4:
switch (fa->mangle.offset) {
case offsetof(struct iphdr, ttl):
/* we currently only support pedit IP4 when it applies
* to TTL and then only when it can be achieved with a
* decrement ttl action
*/
/* check that pedit applies to ttl only */
if (fa->mangle.mask != ~EFX_TC_HDR_TYPE_TTL_MASK) {
NL_SET_ERR_MSG_FMT_MOD(extack,
"Unsupported: mask (%#x) out of range, only support mangle action on ipv4.ttl",
fa->mangle.mask);
return -EOPNOTSUPP;
}
/* we can only convert to a dec ttl when we have an
* exact match on the ttl field
*/
if (match->mask.ip_ttl != U8_MAX) {
NL_SET_ERR_MSG_FMT_MOD(extack,
"Unsupported: only support mangle ipv4.ttl when we have an exact match on ttl, mask used for match (%#x)",
match->mask.ip_ttl);
return -EOPNOTSUPP;
}
/* check that we don't try to decrement 0, which equates
* to setting the ttl to 0xff
*/
if (match->value.ip_ttl == 0) {
NL_SET_ERR_MSG_MOD(extack,
"Unsupported: we cannot decrement ttl past 0");
return -EOPNOTSUPP;
}
/* 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;
}
/* check pedit can be achieved with decrement action */
tr_ttl = match->value.ip_ttl - 1;
if ((fa->mangle.val & EFX_TC_HDR_TYPE_TTL_MASK) == tr_ttl) {
act->do_ttl_dec = 1;
return 0;
}
fallthrough;
default:
NL_SET_ERR_MSG_FMT_MOD(extack,
"Unsupported: only support mangle on the ttl field (offset is %u)",
fa->mangle.offset);
return -EOPNOTSUPP;
}
break;
default:
NL_SET_ERR_MSG_FMT_MOD(extack, "Unhandled mangle htype %u for action rule",
fa->mangle.htype);
@ -1885,7 +1956,7 @@ static int efx_tc_flower_replace(struct efx_nic *efx,
act->vlan_push++;
break;
case FLOW_ACTION_MANGLE:
rc = efx_tc_mangle(efx, act, fa, &mung, extack);
rc = efx_tc_mangle(efx, act, fa, &mung, extack, &match);
if (rc < 0)
goto release;
break;

2
drivers/net/ethernet/sfc/tc.h
View File

@ -48,6 +48,7 @@ struct efx_tc_encap_action; /* see tc_encap_actions.h */
* @vlan_push: the number of vlan headers to push
* @vlan_pop: the number of vlan headers to pop
* @decap: used to indicate a tunnel header decapsulation should take place
* @do_ttl_dec: used to indicate IP TTL / Hop Limit should be decremented
* @deliver: used to indicate a deliver action should take place
* @vlan_tci: tci fields for vlan push actions
* @vlan_proto: ethernet types for vlan push actions
@ -67,6 +68,7 @@ struct efx_tc_action_set {
u16 vlan_push:2;
u16 vlan_pop:2;
u16 decap:1;
u16 do_ttl_dec:1;
u16 deliver:1;
__be16 vlan_tci[2];
__be16 vlan_proto[2];