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Message-Id: <20220710172208.29851-7-yevhen.orlov@plvision.eu>
Date: Sun, 10 Jul 2022 20:22:04 +0300
From: Yevhen Orlov <yevhen.orlov@...ision.eu>
To: netdev@...r.kernel.org
Cc: Volodymyr Mytnyk <volodymyr.mytnyk@...ision.eu>,
Taras Chornyi <taras.chornyi@...ision.eu>,
Mickey Rachamim <mickeyr@...vell.com>,
Serhiy Pshyk <serhiy.pshyk@...ision.eu>,
Yevhen Orlov <yevhen.orlov@...ision.eu>,
Taras Chornyi <tchornyi@...vell.com>,
Oleksandr Mazur <oleksandr.mazur@...ision.eu>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 6/9] net: marvell: prestera: Add heplers to interact with fib_notifier_info
This will be used to implement nexthops related logic in next patches.
Also try to keep ipv4/6 abstraction to be able to reuse helpers for ipv6
in the future.
Co-developed-by: Taras Chornyi <tchornyi@...vell.com>
Signed-off-by: Taras Chornyi <tchornyi@...vell.com>
Co-developed-by: Oleksandr Mazur <oleksandr.mazur@...ision.eu>
Signed-off-by: Oleksandr Mazur <oleksandr.mazur@...ision.eu>
Signed-off-by: Yevhen Orlov <yevhen.orlov@...ision.eu>
---
.../marvell/prestera/prestera_router.c | 311 ++++++++++++++++--
1 file changed, 277 insertions(+), 34 deletions(-)
diff --git a/drivers/net/ethernet/marvell/prestera/prestera_router.c b/drivers/net/ethernet/marvell/prestera/prestera_router.c
index db327ab4a072..0150aa33c958 100644
--- a/drivers/net/ethernet/marvell/prestera/prestera_router.c
+++ b/drivers/net/ethernet/marvell/prestera/prestera_router.c
@@ -7,6 +7,7 @@
#include <net/inet_dscp.h>
#include <net/switchdev.h>
#include <linux/rhashtable.h>
+#include <net/nexthop.h>
#include "prestera.h"
#include "prestera_router_hw.h"
@@ -26,9 +27,10 @@ struct prestera_kern_fib_cache {
} lpm_info; /* hold prepared lpm info */
/* Indicate if route is not overlapped by another table */
struct rhash_head ht_node; /* node of prestera_router */
- struct fib_info *fi;
- dscp_t kern_dscp;
- u8 kern_type;
+ union {
+ struct fib_notifier_info info; /* point to any of 4/6 */
+ struct fib_entry_notifier_info fen4_info;
+ };
bool reachable;
};
@@ -51,15 +53,253 @@ static u32 prestera_fix_tb_id(u32 tb_id)
}
static void
-prestera_util_fen_info2fib_cache_key(struct fib_entry_notifier_info *fen_info,
+prestera_util_fen_info2fib_cache_key(struct fib_notifier_info *info,
struct prestera_kern_fib_cache_key *key)
{
+ struct fib_entry_notifier_info *fen_info =
+ container_of(info, struct fib_entry_notifier_info, info);
+
memset(key, 0, sizeof(*key));
+ key->addr.v = PRESTERA_IPV4;
key->addr.u.ipv4 = cpu_to_be32(fen_info->dst);
key->prefix_len = fen_info->dst_len;
key->kern_tb_id = fen_info->tb_id;
}
+static bool __prestera_fi_is_direct(struct fib_info *fi)
+{
+ struct fib_nh *fib_nh;
+
+ if (fib_info_num_path(fi) == 1) {
+ fib_nh = fib_info_nh(fi, 0);
+ if (fib_nh->fib_nh_scope == RT_SCOPE_HOST)
+ return true;
+ }
+
+ return false;
+}
+
+static bool prestera_fi_is_direct(struct fib_info *fi)
+{
+ if (fi->fib_type != RTN_UNICAST)
+ return false;
+
+ return __prestera_fi_is_direct(fi);
+}
+
+static bool prestera_fi_is_nh(struct fib_info *fi)
+{
+ if (fi->fib_type != RTN_UNICAST)
+ return false;
+
+ return !__prestera_fi_is_direct(fi);
+}
+
+static bool __prestera_fi6_is_direct(struct fib6_info *fi)
+{
+ if (!fi->fib6_nh->nh_common.nhc_gw_family)
+ return true;
+
+ return false;
+}
+
+static bool prestera_fi6_is_direct(struct fib6_info *fi)
+{
+ if (fi->fib6_type != RTN_UNICAST)
+ return false;
+
+ return __prestera_fi6_is_direct(fi);
+}
+
+static bool prestera_fi6_is_nh(struct fib6_info *fi)
+{
+ if (fi->fib6_type != RTN_UNICAST)
+ return false;
+
+ return !__prestera_fi6_is_direct(fi);
+}
+
+static bool prestera_fib_info_is_direct(struct fib_notifier_info *info)
+{
+ struct fib6_entry_notifier_info *fen6_info =
+ container_of(info, struct fib6_entry_notifier_info, info);
+ struct fib_entry_notifier_info *fen_info =
+ container_of(info, struct fib_entry_notifier_info, info);
+
+ if (info->family == AF_INET)
+ return prestera_fi_is_direct(fen_info->fi);
+ else
+ return prestera_fi6_is_direct(fen6_info->rt);
+}
+
+static bool prestera_fib_info_is_nh(struct fib_notifier_info *info)
+{
+ struct fib6_entry_notifier_info *fen6_info =
+ container_of(info, struct fib6_entry_notifier_info, info);
+ struct fib_entry_notifier_info *fen_info =
+ container_of(info, struct fib_entry_notifier_info, info);
+
+ if (info->family == AF_INET)
+ return prestera_fi_is_nh(fen_info->fi);
+ else
+ return prestera_fi6_is_nh(fen6_info->rt);
+}
+
+/* must be called with rcu_read_lock() */
+static int prestera_util_kern_get_route(struct fib_result *res, u32 tb_id,
+ __be32 *addr)
+{
+ struct fib_table *tb;
+ struct flowi4 fl4;
+ int ret;
+
+ /* TODO: walkthrough appropriate tables in kernel
+ * to know if the same prefix exists in several tables
+ */
+ tb = fib_new_table(&init_net, tb_id);
+ if (!tb)
+ return -ENOENT;
+
+ memset(&fl4, 0, sizeof(fl4));
+ fl4.daddr = *addr;
+ ret = fib_table_lookup(tb, &fl4, res, FIB_LOOKUP_NOREF);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static bool
+__prestera_util_kern_n_is_reachable_v4(u32 tb_id, __be32 *addr,
+ struct net_device *dev)
+{
+ struct fib_nh *fib_nh;
+ struct fib_result res;
+ bool reachable;
+
+ reachable = false;
+
+ if (!prestera_util_kern_get_route(&res, tb_id, addr))
+ if (prestera_fi_is_direct(res.fi)) {
+ fib_nh = fib_info_nh(res.fi, 0);
+ if (dev == fib_nh->fib_nh_dev)
+ reachable = true;
+ }
+
+ return reachable;
+}
+
+/* Check if neigh route is reachable */
+static bool
+prestera_util_kern_n_is_reachable(u32 tb_id,
+ struct prestera_ip_addr *addr,
+ struct net_device *dev)
+{
+ if (addr->v == PRESTERA_IPV4)
+ return __prestera_util_kern_n_is_reachable_v4(tb_id,
+ &addr->u.ipv4,
+ dev);
+ else
+ return false;
+}
+
+static void prestera_util_kern_set_neigh_offload(struct neighbour *n,
+ bool offloaded)
+{
+ if (offloaded)
+ n->flags |= NTF_OFFLOADED;
+ else
+ n->flags &= ~NTF_OFFLOADED;
+}
+
+static void
+prestera_util_kern_set_nh_offload(struct fib_nh_common *nhc, bool offloaded, bool trap)
+{
+ if (offloaded)
+ nhc->nhc_flags |= RTNH_F_OFFLOAD;
+ else
+ nhc->nhc_flags &= ~RTNH_F_OFFLOAD;
+
+ if (trap)
+ nhc->nhc_flags |= RTNH_F_TRAP;
+ else
+ nhc->nhc_flags &= ~RTNH_F_TRAP;
+}
+
+static struct fib_nh_common *
+prestera_kern_fib_info_nhc(struct fib_notifier_info *info, int n)
+{
+ struct fib6_entry_notifier_info *fen6_info;
+ struct fib_entry_notifier_info *fen4_info;
+ struct fib6_info *iter;
+
+ if (info->family == AF_INET) {
+ fen4_info = container_of(info, struct fib_entry_notifier_info,
+ info);
+ return &fib_info_nh(fen4_info->fi, n)->nh_common;
+ } else if (info->family == AF_INET6) {
+ fen6_info = container_of(info, struct fib6_entry_notifier_info,
+ info);
+ if (!n)
+ return &fen6_info->rt->fib6_nh->nh_common;
+
+ list_for_each_entry(iter, &fen6_info->rt->fib6_siblings,
+ fib6_siblings) {
+ if (!--n)
+ return &iter->fib6_nh->nh_common;
+ }
+ }
+
+ /* if family is incorrect - than upper functions has BUG */
+ /* if doesn't find requested index - there is alsi bug, because
+ * valid index must be produced by nhs, which checks list length
+ */
+ WARN(1, "Invalid parameters passed to %s n=%d i=%p",
+ __func__, n, info);
+ return NULL;
+}
+
+static int prestera_kern_fib_info_nhs(struct fib_notifier_info *info)
+{
+ struct fib6_entry_notifier_info *fen6_info;
+ struct fib_entry_notifier_info *fen4_info;
+
+ if (info->family == AF_INET) {
+ fen4_info = container_of(info, struct fib_entry_notifier_info,
+ info);
+ return fib_info_num_path(fen4_info->fi);
+ } else if (info->family == AF_INET6) {
+ fen6_info = container_of(info, struct fib6_entry_notifier_info,
+ info);
+ return fen6_info->rt->fib6_nh ?
+ (fen6_info->rt->fib6_nsiblings + 1) : 0;
+ }
+
+ return 0;
+}
+
+static unsigned char
+prestera_kern_fib_info_type(struct fib_notifier_info *info)
+{
+ struct fib6_entry_notifier_info *fen6_info;
+ struct fib_entry_notifier_info *fen4_info;
+
+ if (info->family == AF_INET) {
+ fen4_info = container_of(info, struct fib_entry_notifier_info,
+ info);
+ return fen4_info->fi->fib_type;
+ } else if (info->family == AF_INET6) {
+ fen6_info = container_of(info, struct fib6_entry_notifier_info,
+ info);
+ /* TODO: ECMP in ipv6 is several routes.
+ * Every route has single nh.
+ */
+ return fen6_info->rt->fib6_type;
+ }
+
+ return RTN_UNSPEC;
+}
+
static struct prestera_kern_fib_cache *
prestera_kern_fib_cache_find(struct prestera_switch *sw,
struct prestera_kern_fib_cache_key *key)
@@ -76,7 +316,7 @@ static void
prestera_kern_fib_cache_destroy(struct prestera_switch *sw,
struct prestera_kern_fib_cache *fib_cache)
{
- fib_info_put(fib_cache->fi);
+ fib_info_put(fib_cache->fen4_info.fi);
rhashtable_remove_fast(&sw->router->kern_fib_cache_ht,
&fib_cache->ht_node,
__prestera_kern_fib_cache_ht_params);
@@ -89,8 +329,10 @@ prestera_kern_fib_cache_destroy(struct prestera_switch *sw,
static struct prestera_kern_fib_cache *
prestera_kern_fib_cache_create(struct prestera_switch *sw,
struct prestera_kern_fib_cache_key *key,
- struct fib_info *fi, dscp_t dscp, u8 type)
+ struct fib_notifier_info *info)
{
+ struct fib_entry_notifier_info *fen_info =
+ container_of(info, struct fib_entry_notifier_info, info);
struct prestera_kern_fib_cache *fib_cache;
int err;
@@ -99,10 +341,8 @@ prestera_kern_fib_cache_create(struct prestera_switch *sw,
goto err_kzalloc;
memcpy(&fib_cache->key, key, sizeof(*key));
- fib_info_hold(fi);
- fib_cache->fi = fi;
- fib_cache->kern_dscp = dscp;
- fib_cache->kern_type = type;
+ fib_info_hold(fen_info->fi);
+ memcpy(&fib_cache->fen4_info, fen_info, sizeof(*fen_info));
err = rhashtable_insert_fast(&sw->router->kern_fib_cache_ht,
&fib_cache->ht_node,
@@ -113,7 +353,7 @@ prestera_kern_fib_cache_create(struct prestera_switch *sw,
return fib_cache;
err_ht_insert:
- fib_info_put(fi);
+ fib_info_put(fen_info->fi);
kfree(fib_cache);
err_kzalloc:
return NULL;
@@ -126,21 +366,25 @@ __prestera_k_arb_fib_lpm_offload_set(struct prestera_switch *sw,
{
struct fib_rt_info fri;
- if (fc->key.addr.v != PRESTERA_IPV4)
+ switch (fc->key.addr.v) {
+ case PRESTERA_IPV4:
+ fri.fi = fc->fen4_info.fi;
+ fri.tb_id = fc->key.kern_tb_id;
+ fri.dst = fc->key.addr.u.ipv4;
+ fri.dst_len = fc->key.prefix_len;
+ fri.dscp = fc->fen4_info.dscp;
+ fri.type = fc->fen4_info.type;
+ /* flags begin */
+ fri.offload = offload;
+ fri.trap = trap;
+ fri.offload_failed = fail;
+ /* flags end */
+ fib_alias_hw_flags_set(&init_net, &fri);
return;
-
- fri.fi = fc->fi;
- fri.tb_id = fc->key.kern_tb_id;
- fri.dst = fc->key.addr.u.ipv4;
- fri.dst_len = fc->key.prefix_len;
- fri.dscp = fc->kern_dscp;
- fri.type = fc->kern_type;
- /* flags begin */
- fri.offload = offload;
- fri.trap = trap;
- fri.offload_failed = fail;
- /* flags end */
- fib_alias_hw_flags_set(&init_net, &fri);
+ case PRESTERA_IPV6:
+ /* TODO */
+ return;
+ }
}
static int
@@ -149,7 +393,7 @@ __prestera_pr_k_arb_fc_lpm_info_calc(struct prestera_switch *sw,
{
memset(&fc->lpm_info, 0, sizeof(fc->lpm_info));
- switch (fc->fi->fib_type) {
+ switch (prestera_kern_fib_info_type(&fc->info)) {
case RTN_UNICAST:
fc->lpm_info.fib_type = PRESTERA_FIB_TYPE_TRAP;
break;
@@ -274,14 +518,14 @@ __prestera_k_arb_util_fib_overlapped(struct prestera_switch *sw,
static int
prestera_k_arb_fib_evt(struct prestera_switch *sw,
bool replace, /* replace or del */
- struct fib_entry_notifier_info *fen_info)
+ struct fib_notifier_info *info)
{
struct prestera_kern_fib_cache *tfib_cache, *bfib_cache; /* top/btm */
struct prestera_kern_fib_cache_key fc_key;
struct prestera_kern_fib_cache *fib_cache;
int err;
- prestera_util_fen_info2fib_cache_key(fen_info, &fc_key);
+ prestera_util_fen_info2fib_cache_key(info, &fc_key);
fib_cache = prestera_kern_fib_cache_find(sw, &fc_key);
if (fib_cache) {
fib_cache->reachable = false;
@@ -304,10 +548,7 @@ prestera_k_arb_fib_evt(struct prestera_switch *sw,
}
if (replace) {
- fib_cache = prestera_kern_fib_cache_create(sw, &fc_key,
- fen_info->fi,
- fen_info->dscp,
- fen_info->type);
+ fib_cache = prestera_kern_fib_cache_create(sw, &fc_key, info);
if (!fib_cache) {
dev_err(sw->dev->dev, "fib_cache == NULL");
return -ENOENT;
@@ -512,13 +753,15 @@ static void __prestera_router_fib_event_work(struct work_struct *work)
switch (fib_work->event) {
case FIB_EVENT_ENTRY_REPLACE:
- err = prestera_k_arb_fib_evt(sw, true, &fib_work->fen_info);
+ err = prestera_k_arb_fib_evt(sw, true,
+ &fib_work->fen_info.info);
if (err)
goto err_out;
break;
case FIB_EVENT_ENTRY_DEL:
- err = prestera_k_arb_fib_evt(sw, false, &fib_work->fen_info);
+ err = prestera_k_arb_fib_evt(sw, false,
+ &fib_work->fen_info.info);
if (err)
goto err_out;
--
2.17.1
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