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Date: Tue, 14 Mar 2023 17:35:24 +0000
From: <edward.cree@....com>
To: <linux-net-drivers@....com>, <davem@...emloft.net>,
<kuba@...nel.org>, <pabeni@...hat.com>, <edumazet@...gle.com>
CC: Edward Cree <ecree.xilinx@...il.com>, <netdev@...r.kernel.org>,
<habetsm.xilinx@...il.com>
Subject: [PATCH net-next 4/5] sfc: add code to register and unregister encap matches
From: Edward Cree <ecree.xilinx@...il.com>
Add a hashtable to detect duplicate and conflicting matches. If match
is not a duplicate, call MAE functions to add/remove it from OR table.
Calling code not added yet, so mark the new functions as unused.
Signed-off-by: Edward Cree <ecree.xilinx@...il.com>
---
drivers/net/ethernet/sfc/tc.c | 176 ++++++++++++++++++++++++++++++++++
drivers/net/ethernet/sfc/tc.h | 11 +++
2 files changed, 187 insertions(+)
diff --git a/drivers/net/ethernet/sfc/tc.c b/drivers/net/ethernet/sfc/tc.c
index d683665a8d87..dc092403af12 100644
--- a/drivers/net/ethernet/sfc/tc.c
+++ b/drivers/net/ethernet/sfc/tc.c
@@ -57,6 +57,12 @@ static s64 efx_tc_flower_external_mport(struct efx_nic *efx, struct efx_rep *efv
return mport;
}
+static const struct rhashtable_params efx_tc_encap_match_ht_params = {
+ .key_len = offsetof(struct efx_tc_encap_match, linkage),
+ .key_offset = 0,
+ .head_offset = offsetof(struct efx_tc_encap_match, linkage),
+};
+
static const struct rhashtable_params efx_tc_match_action_ht_params = {
.key_len = sizeof(unsigned long),
.key_offset = offsetof(struct efx_tc_flow_rule, cookie),
@@ -344,6 +350,157 @@ static int efx_tc_flower_parse_match(struct efx_nic *efx,
return 0;
}
+__always_unused
+static int efx_tc_flower_record_encap_match(struct efx_nic *efx,
+ struct efx_tc_match *match,
+ enum efx_encap_type type,
+ struct netlink_ext_ack *extack)
+{
+ struct efx_tc_encap_match *encap, *old;
+ unsigned char ipv;
+ int rc;
+
+ /* We require that the socket-defining fields (IP addrs and UDP dest
+ * port) are present and exact-match. Other fields are currently not
+ * allowed. This meets what OVS will ask for, and means that we don't
+ * need to handle difficult checks for overlapping matches as could
+ * come up if we allowed masks or varying sets of match fields.
+ */
+ if (match->mask.enc_dst_ip | match->mask.enc_src_ip) {
+ ipv = 4;
+ if (!IS_ALL_ONES(match->mask.enc_dst_ip)) {
+ NL_SET_ERR_MSG_MOD(extack,
+ "Egress encap match is not exact on dst IP address");
+ return -EOPNOTSUPP;
+ }
+ if (!IS_ALL_ONES(match->mask.enc_src_ip)) {
+ NL_SET_ERR_MSG_MOD(extack,
+ "Egress encap match is not exact on src IP address");
+ return -EOPNOTSUPP;
+ }
+#ifdef CONFIG_IPV6
+ if (!ipv6_addr_any(&match->mask.enc_dst_ip6) ||
+ !ipv6_addr_any(&match->mask.enc_src_ip6)) {
+ NL_SET_ERR_MSG_MOD(extack,
+ "Egress encap match on both IPv4 and IPv6, don't understand");
+ return -EOPNOTSUPP;
+ }
+ } else {
+ ipv = 6;
+ if (!efx_ipv6_addr_all_ones(&match->mask.enc_dst_ip6)) {
+ NL_SET_ERR_MSG_MOD(extack,
+ "Egress encap match is not exact on dst IP address");
+ return -EOPNOTSUPP;
+ }
+ if (!efx_ipv6_addr_all_ones(&match->mask.enc_src_ip6)) {
+ NL_SET_ERR_MSG_MOD(extack,
+ "Egress encap match is not exact on src IP address");
+ return -EOPNOTSUPP;
+ }
+#endif
+ }
+ if (!IS_ALL_ONES(match->mask.enc_dport)) {
+ NL_SET_ERR_MSG_MOD(extack, "Egress encap match is not exact on dst UDP port");
+ return -EOPNOTSUPP;
+ }
+ if (match->mask.enc_sport) {
+ NL_SET_ERR_MSG_MOD(extack, "Egress encap match on src UDP port not supported");
+ return -EOPNOTSUPP;
+ }
+ if (match->mask.enc_ip_tos) {
+ NL_SET_ERR_MSG_MOD(extack, "Egress encap match on IP ToS not supported");
+ return -EOPNOTSUPP;
+ }
+ if (match->mask.enc_ip_ttl) {
+ NL_SET_ERR_MSG_MOD(extack, "Egress encap match on IP TTL not supported");
+ return -EOPNOTSUPP;
+ }
+
+ rc = efx_mae_check_encap_match_caps(efx, ipv, extack);
+ if (rc) {
+ NL_SET_ERR_MSG_FMT_MOD(extack, "MAE hw reports no support for IPv%d encap matches",
+ ipv);
+ return -EOPNOTSUPP;
+ }
+
+ encap = kzalloc(sizeof(*encap), GFP_USER);
+ if (!encap)
+ return -ENOMEM;
+ switch (ipv) {
+ case 4:
+ encap->src_ip = match->value.enc_src_ip;
+ encap->dst_ip = match->value.enc_dst_ip;
+ break;
+#ifdef CONFIG_IPV6
+ case 6:
+ encap->src_ip6 = match->value.enc_src_ip6;
+ encap->dst_ip6 = match->value.enc_dst_ip6;
+ break;
+#endif
+ default: /* can't happen */
+ NL_SET_ERR_MSG_FMT_MOD(extack, "Egress encap match on bad IP version %d",
+ ipv);
+ rc = -EOPNOTSUPP;
+ goto fail_allocated;
+ }
+ encap->udp_dport = match->value.enc_dport;
+ encap->tun_type = type;
+ old = rhashtable_lookup_get_insert_fast(&efx->tc->encap_match_ht,
+ &encap->linkage,
+ efx_tc_encap_match_ht_params);
+ if (old) {
+ /* don't need our new entry */
+ kfree(encap);
+ if (old->tun_type != type) {
+ NL_SET_ERR_MSG_FMT_MOD(extack,
+ "Egress encap match with conflicting tun_type %u != %u",
+ old->tun_type, type);
+ return -EEXIST;
+ }
+ if (!refcount_inc_not_zero(&old->ref))
+ return -EAGAIN;
+ /* existing entry found */
+ encap = old;
+ } else {
+ rc = efx_mae_register_encap_match(efx, encap);
+ if (rc) {
+ NL_SET_ERR_MSG_MOD(extack, "Failed to record egress encap match in HW");
+ goto fail_inserted;
+ }
+ refcount_set(&encap->ref, 1);
+ }
+ match->encap = encap;
+ return 0;
+fail_inserted:
+ rhashtable_remove_fast(&efx->tc->encap_match_ht, &encap->linkage,
+ efx_tc_encap_match_ht_params);
+fail_allocated:
+ kfree(encap);
+ return rc;
+}
+
+__always_unused
+static void efx_tc_flower_release_encap_match(struct efx_nic *efx,
+ struct efx_tc_encap_match *encap)
+{
+ int rc;
+
+ if (!refcount_dec_and_test(&encap->ref))
+ return; /* still in use */
+
+ rc = efx_mae_unregister_encap_match(efx, encap);
+ if (rc)
+ /* Display message but carry on and remove entry from our
+ * SW tables, because there's not much we can do about it.
+ */
+ netif_err(efx, drv, efx->net_dev,
+ "Failed to release encap match %#x, rc %d\n",
+ encap->fw_id, rc);
+ rhashtable_remove_fast(&efx->tc->encap_match_ht, &encap->linkage,
+ efx_tc_encap_match_ht_params);
+ kfree(encap);
+}
+
/* For details of action order constraints refer to SF-123102-TC-1ยง12.6.1 */
enum efx_tc_action_order {
EFX_TC_AO_VLAN_POP,
@@ -954,6 +1111,18 @@ void efx_fini_tc(struct efx_nic *efx)
efx->tc->up = false;
}
+/* At teardown time, all TC filter rules (and thus all resources they created)
+ * should already have been removed. If we find any in our hashtables, make a
+ * cursory attempt to clean up the software side.
+ */
+static void efx_tc_encap_match_free(void *ptr, void *__unused)
+{
+ struct efx_tc_encap_match *encap = ptr;
+
+ WARN_ON(refcount_read(&encap->ref));
+ kfree(encap);
+}
+
int efx_init_struct_tc(struct efx_nic *efx)
{
int rc;
@@ -976,6 +1145,9 @@ int efx_init_struct_tc(struct efx_nic *efx)
rc = efx_tc_init_counters(efx);
if (rc < 0)
goto fail_counters;
+ rc = rhashtable_init(&efx->tc->encap_match_ht, &efx_tc_encap_match_ht_params);
+ if (rc < 0)
+ goto fail_encap_match_ht;
rc = rhashtable_init(&efx->tc->match_action_ht, &efx_tc_match_action_ht_params);
if (rc < 0)
goto fail_match_action_ht;
@@ -988,6 +1160,8 @@ int efx_init_struct_tc(struct efx_nic *efx)
efx->extra_channel_type[EFX_EXTRA_CHANNEL_TC] = &efx_tc_channel_type;
return 0;
fail_match_action_ht:
+ rhashtable_destroy(&efx->tc->encap_match_ht);
+fail_encap_match_ht:
efx_tc_destroy_counters(efx);
fail_counters:
mutex_destroy(&efx->tc->mutex);
@@ -1010,6 +1184,8 @@ void efx_fini_struct_tc(struct efx_nic *efx)
MC_CMD_MAE_ACTION_RULE_INSERT_OUT_ACTION_RULE_ID_NULL);
rhashtable_free_and_destroy(&efx->tc->match_action_ht, efx_tc_flow_free,
efx);
+ rhashtable_free_and_destroy(&efx->tc->encap_match_ht,
+ efx_tc_encap_match_free, NULL);
efx_tc_fini_counters(efx);
mutex_unlock(&efx->tc->mutex);
mutex_destroy(&efx->tc->mutex);
diff --git a/drivers/net/ethernet/sfc/tc.h b/drivers/net/ethernet/sfc/tc.h
index 19782c9a4354..d70c0ba86669 100644
--- a/drivers/net/ethernet/sfc/tc.h
+++ b/drivers/net/ethernet/sfc/tc.h
@@ -18,6 +18,13 @@
#define IS_ALL_ONES(v) (!(typeof (v))~(v))
+#ifdef CONFIG_IPV6
+static inline bool efx_ipv6_addr_all_ones(struct in6_addr *addr)
+{
+ return !memchr_inv(addr, 0xff, sizeof(*addr));
+}
+#endif
+
struct efx_tc_action_set {
u16 vlan_push:2;
u16 vlan_pop:2;
@@ -70,7 +77,9 @@ struct efx_tc_encap_match {
__be32 src_ip, dst_ip;
struct in6_addr src_ip6, dst_ip6;
__be16 udp_dport;
+ struct rhash_head linkage;
u16 tun_type; /* enum efx_encap_type */
+ refcount_t ref;
u32 fw_id; /* index of this entry in firmware encap match table */
};
@@ -107,6 +116,7 @@ enum efx_tc_rule_prios {
* @mutex: Used to serialise operations on TC hashtables
* @counter_ht: Hashtable of TC counters (FW IDs and counter values)
* @counter_id_ht: Hashtable mapping TC counter cookies to counters
+ * @encap_match_ht: Hashtable of TC encap matches
* @match_action_ht: Hashtable of TC match-action rules
* @reps_mport_id: MAE port allocated for representor RX
* @reps_filter_uc: VNIC filter for representor unicast RX (promisc)
@@ -130,6 +140,7 @@ struct efx_tc_state {
struct mutex mutex;
struct rhashtable counter_ht;
struct rhashtable counter_id_ht;
+ struct rhashtable encap_match_ht;
struct rhashtable match_action_ht;
u32 reps_mport_id, reps_mport_vport_id;
s32 reps_filter_uc, reps_filter_mc;
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