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Date: Tue, 14 Mar 2023 11:09:25 +0100
From: Íñigo Huguet <ihuguet@...hat.com>
To: ecree.xilinx@...il.com, habetsm.xilinx@...il.com,
richardcochran@...il.com
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
pabeni@...hat.com, netdev@...r.kernel.org,
Íñigo Huguet <ihuguet@...hat.com>,
Yalin Li <yalli@...hat.com>
Subject: [PATCH RESEND net-next v4 4/4] sfc: remove expired unicast PTP filters
Filters inserted to support unicast PTP mode might become unused after
some time, so we need to remove them to avoid accumulating many of them.
Actually, it would be a very unusual situation that many different
addresses are used, normally only a small set of predefined
addresses are tried. Anyway, some cleanup is necessary because
maintaining old filters forever makes very little sense.
Reported-by: Yalin Li <yalli@...hat.com>
Signed-off-by: Íñigo Huguet <ihuguet@...hat.com>
---
drivers/net/ethernet/sfc/ptp.c | 83 ++++++++++++++++++++++++----------
1 file changed, 60 insertions(+), 23 deletions(-)
diff --git a/drivers/net/ethernet/sfc/ptp.c b/drivers/net/ethernet/sfc/ptp.c
index 16686aa5bfb4..1447683dce31 100644
--- a/drivers/net/ethernet/sfc/ptp.c
+++ b/drivers/net/ethernet/sfc/ptp.c
@@ -75,6 +75,9 @@
/* How long an unmatched event or packet can be held */
#define PKT_EVENT_LIFETIME_MS 10
+/* How long unused unicast filters can be held */
+#define UCAST_FILTER_EXPIRY_JIFFIES msecs_to_jiffies(30000)
+
/* Offsets into PTP packet for identification. These offsets are from the
* start of the IP header, not the MAC header. Note that neither PTP V1 nor
* PTP V2 permit the use of IPV4 options.
@@ -218,6 +221,7 @@ struct efx_ptp_timeset {
* @ether_type: Network protocol of the filter (ETHER_P_IP / ETHER_P_IPV6)
* @loc_port: UDP port of the filter (PTP_EVENT_PORT / PTP_GENERAL_PORT)
* @loc_host: IPv4/v6 address of the filter
+ * @expiry: time when the filter expires, in jiffies
* @handle: Handle ID for the MCDI filters table
*/
struct efx_ptp_rxfilter {
@@ -225,6 +229,7 @@ struct efx_ptp_rxfilter {
__be16 ether_type;
__be16 loc_port;
__be32 loc_host[4];
+ unsigned long expiry;
int handle;
};
@@ -1318,8 +1323,8 @@ static inline void efx_ptp_process_rx(struct efx_nic *efx, struct sk_buff *skb)
local_bh_enable();
}
-static bool efx_ptp_filter_exists(struct list_head *ptp_list,
- struct efx_filter_spec *spec)
+static struct efx_ptp_rxfilter *
+efx_ptp_find_filter(struct list_head *ptp_list, struct efx_filter_spec *spec)
{
struct efx_ptp_rxfilter *rxfilter;
@@ -1327,10 +1332,19 @@ static bool efx_ptp_filter_exists(struct list_head *ptp_list,
if (rxfilter->ether_type == spec->ether_type &&
rxfilter->loc_port == spec->loc_port &&
!memcmp(rxfilter->loc_host, spec->loc_host, sizeof(spec->loc_host)))
- return true;
+ return rxfilter;
}
- return false;
+ return NULL;
+}
+
+static void efx_ptp_remove_one_filter(struct efx_nic *efx,
+ struct efx_ptp_rxfilter *rxfilter)
+{
+ efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED,
+ rxfilter->handle);
+ list_del(&rxfilter->list);
+ kfree(rxfilter);
}
static void efx_ptp_remove_filters(struct efx_nic *efx,
@@ -1339,10 +1353,7 @@ static void efx_ptp_remove_filters(struct efx_nic *efx,
struct efx_ptp_rxfilter *rxfilter, *tmp;
list_for_each_entry_safe(rxfilter, tmp, ptp_list, list) {
- efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED,
- rxfilter->handle);
- list_del(&rxfilter->list);
- kfree(rxfilter);
+ efx_ptp_remove_one_filter(efx, rxfilter);
}
}
@@ -1358,13 +1369,17 @@ static void efx_ptp_init_filter(struct efx_nic *efx,
static int efx_ptp_insert_filter(struct efx_nic *efx,
struct list_head *ptp_list,
- struct efx_filter_spec *spec)
+ struct efx_filter_spec *spec,
+ unsigned long expiry)
{
struct efx_ptp_rxfilter *rxfilter;
int rc;
- if (efx_ptp_filter_exists(ptp_list, spec))
+ rxfilter = efx_ptp_find_filter(ptp_list, spec);
+ if (rxfilter) {
+ rxfilter->expiry = expiry;
return 0;
+ }
rxfilter = kzalloc(sizeof(*rxfilter), GFP_KERNEL);
if (!rxfilter)
@@ -1378,6 +1393,7 @@ static int efx_ptp_insert_filter(struct efx_nic *efx,
rxfilter->ether_type = spec->ether_type;
rxfilter->loc_port = spec->loc_port;
memcpy(rxfilter->loc_host, spec->loc_host, sizeof(spec->loc_host));
+ rxfilter->expiry = expiry;
list_add(&rxfilter->list, ptp_list);
return 0;
@@ -1389,28 +1405,31 @@ static int efx_ptp_insert_filter(struct efx_nic *efx,
static int efx_ptp_insert_ipv4_filter(struct efx_nic *efx,
struct list_head *ptp_list,
- __be32 addr, u16 port)
+ __be32 addr, u16 port,
+ unsigned long expiry)
{
struct efx_filter_spec spec;
efx_ptp_init_filter(efx, &spec);
efx_filter_set_ipv4_local(&spec, IPPROTO_UDP, addr, htons(port));
- return efx_ptp_insert_filter(efx, ptp_list, &spec);
+ return efx_ptp_insert_filter(efx, ptp_list, &spec, expiry);
}
static int efx_ptp_insert_ipv6_filter(struct efx_nic *efx,
struct list_head *ptp_list,
- struct in6_addr *addr, u16 port)
+ struct in6_addr *addr, u16 port,
+ unsigned long expiry)
{
struct efx_filter_spec spec;
efx_ptp_init_filter(efx, &spec);
efx_filter_set_ipv6_local(&spec, IPPROTO_UDP, addr, htons(port));
- return efx_ptp_insert_filter(efx, ptp_list, &spec);
+ return efx_ptp_insert_filter(efx, ptp_list, &spec, expiry);
}
static int efx_ptp_insert_eth_multicast_filter(struct efx_nic *efx)
{
+ struct efx_ptp_data *ptp = efx->ptp_data;
const u8 addr[ETH_ALEN] = PTP_ADDR_ETHER;
struct efx_filter_spec spec;
@@ -1418,7 +1437,7 @@ static int efx_ptp_insert_eth_multicast_filter(struct efx_nic *efx)
efx_filter_set_eth_local(&spec, EFX_FILTER_VID_UNSPEC, addr);
spec.match_flags |= EFX_FILTER_MATCH_ETHER_TYPE;
spec.ether_type = htons(ETH_P_1588);
- return efx_ptp_insert_filter(efx, &efx->ptp_data->rxfilters_mcast, &spec);
+ return efx_ptp_insert_filter(efx, &ptp->rxfilters_mcast, &spec, 0);
}
static int efx_ptp_insert_multicast_filters(struct efx_nic *efx)
@@ -1433,12 +1452,14 @@ static int efx_ptp_insert_multicast_filters(struct efx_nic *efx)
* that there is no packet re-ordering.
*/
rc = efx_ptp_insert_ipv4_filter(efx, &ptp->rxfilters_mcast,
- htonl(PTP_ADDR_IPV4), PTP_EVENT_PORT);
+ htonl(PTP_ADDR_IPV4), PTP_EVENT_PORT,
+ 0);
if (rc < 0)
goto fail;
rc = efx_ptp_insert_ipv4_filter(efx, &ptp->rxfilters_mcast,
- htonl(PTP_ADDR_IPV4), PTP_GENERAL_PORT);
+ htonl(PTP_ADDR_IPV4), PTP_GENERAL_PORT,
+ 0);
if (rc < 0)
goto fail;
@@ -1449,12 +1470,12 @@ static int efx_ptp_insert_multicast_filters(struct efx_nic *efx)
struct in6_addr ipv6_addr = {{PTP_ADDR_IPV6}};
rc = efx_ptp_insert_ipv6_filter(efx, &ptp->rxfilters_mcast,
- &ipv6_addr, PTP_EVENT_PORT);
+ &ipv6_addr, PTP_EVENT_PORT, 0);
if (rc < 0)
goto fail;
rc = efx_ptp_insert_ipv6_filter(efx, &ptp->rxfilters_mcast,
- &ipv6_addr, PTP_GENERAL_PORT);
+ &ipv6_addr, PTP_GENERAL_PORT, 0);
if (rc < 0)
goto fail;
@@ -1490,21 +1511,24 @@ static int efx_ptp_insert_unicast_filter(struct efx_nic *efx,
struct sk_buff *skb)
{
struct efx_ptp_data *ptp = efx->ptp_data;
+ unsigned long expiry;
int rc;
if (!efx_ptp_valid_unicast_event_pkt(skb))
return -EINVAL;
+ expiry = jiffies + UCAST_FILTER_EXPIRY_JIFFIES;
+
if (skb->protocol == htons(ETH_P_IP)) {
__be32 addr = ip_hdr(skb)->saddr;
rc = efx_ptp_insert_ipv4_filter(efx, &ptp->rxfilters_ucast,
- addr, PTP_EVENT_PORT);
+ addr, PTP_EVENT_PORT, expiry);
if (rc < 0)
goto fail;
rc = efx_ptp_insert_ipv4_filter(efx, &ptp->rxfilters_ucast,
- addr, PTP_GENERAL_PORT);
+ addr, PTP_GENERAL_PORT, expiry);
if (rc < 0)
goto fail;
} else if (efx_ptp_use_mac_tx_timestamps(efx)) {
@@ -1512,12 +1536,12 @@ static int efx_ptp_insert_unicast_filter(struct efx_nic *efx,
struct in6_addr *addr = &ipv6_hdr(skb)->saddr;
rc = efx_ptp_insert_ipv6_filter(efx, &ptp->rxfilters_ucast,
- addr, PTP_EVENT_PORT);
+ addr, PTP_EVENT_PORT, expiry);
if (rc < 0)
goto fail;
rc = efx_ptp_insert_ipv6_filter(efx, &ptp->rxfilters_ucast,
- addr, PTP_GENERAL_PORT);
+ addr, PTP_GENERAL_PORT, expiry);
if (rc < 0)
goto fail;
} else {
@@ -1531,6 +1555,17 @@ static int efx_ptp_insert_unicast_filter(struct efx_nic *efx,
return rc;
}
+static void efx_ptp_drop_expired_unicast_filters(struct efx_nic *efx)
+{
+ struct efx_ptp_data *ptp = efx->ptp_data;
+ struct efx_ptp_rxfilter *rxfilter, *tmp;
+
+ list_for_each_entry_safe(rxfilter, tmp, &ptp->rxfilters_ucast, list) {
+ if (time_is_before_jiffies(rxfilter->expiry))
+ efx_ptp_remove_one_filter(efx, rxfilter);
+ }
+}
+
static int efx_ptp_start(struct efx_nic *efx)
{
struct efx_ptp_data *ptp = efx->ptp_data;
@@ -1631,6 +1666,8 @@ static void efx_ptp_worker(struct work_struct *work)
while ((skb = __skb_dequeue(&tempq)))
efx_ptp_process_rx(efx, skb);
+
+ efx_ptp_drop_expired_unicast_filters(efx);
}
static const struct ptp_clock_info efx_phc_clock_info = {
--
2.34.3
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