From ed6e564c214e9852ff7f3d8f676a892dda905651 Mon Sep 17 00:00:00 2001 From: John Daley Date: Thu, 2 Feb 2017 17:18:40 -0800 Subject: [PATCH] net/enic: fix memory leak with oversized Tx packets If a packet send is attempted with a packet larger than the NIC is capable of processing (9208) it will be dropped with no completion descriptor returned or completion index update, which will lead to an mbuf leak and eventual hang. Drop and count oversized Tx packets in the Tx burst function and dereference/free the mbuf without sending it to the NIC. Since the maximum Rx and Tx packet sizes are different on enic and are now both being used, make the define ENIC_DEFAULT_MAX_PKT_SIZE be 2 defines, one for Rx and one for Tx. Fixes: fefed3d1e62c ("enic: new driver") Cc: stable@dpdk.org Signed-off-by: John Daley --- drivers/net/enic/enic.h | 1 + drivers/net/enic/enic_main.c | 5 ++++- drivers/net/enic/enic_res.c | 5 +++-- drivers/net/enic/enic_res.h | 5 ++++- drivers/net/enic/enic_rxtx.c | 13 ++++++++++--- 5 files changed, 22 insertions(+), 7 deletions(-) diff --git a/drivers/net/enic/enic.h b/drivers/net/enic/enic.h index a4540178ef..e921de4055 100644 --- a/drivers/net/enic/enic.h +++ b/drivers/net/enic/enic.h @@ -103,6 +103,7 @@ struct enic_fdir { struct enic_soft_stats { rte_atomic64_t rx_nombuf; rte_atomic64_t rx_packet_errors; + rte_atomic64_t tx_oversized; }; struct enic_memzone_entry { diff --git a/drivers/net/enic/enic_main.c b/drivers/net/enic/enic_main.c index 21e8edeb08..570b7b69a1 100644 --- a/drivers/net/enic/enic_main.c +++ b/drivers/net/enic/enic_main.c @@ -137,6 +137,7 @@ static void enic_clear_soft_stats(struct enic *enic) struct enic_soft_stats *soft_stats = &enic->soft_stats; rte_atomic64_clear(&soft_stats->rx_nombuf); rte_atomic64_clear(&soft_stats->rx_packet_errors); + rte_atomic64_clear(&soft_stats->tx_oversized); } static void enic_init_soft_stats(struct enic *enic) @@ -144,6 +145,7 @@ static void enic_init_soft_stats(struct enic *enic) struct enic_soft_stats *soft_stats = &enic->soft_stats; rte_atomic64_init(&soft_stats->rx_nombuf); rte_atomic64_init(&soft_stats->rx_packet_errors); + rte_atomic64_init(&soft_stats->tx_oversized); enic_clear_soft_stats(enic); } @@ -183,7 +185,8 @@ void enic_dev_stats_get(struct enic *enic, struct rte_eth_stats *r_stats) r_stats->obytes = stats->tx.tx_bytes_ok; r_stats->ierrors = stats->rx.rx_errors + stats->rx.rx_drop; - r_stats->oerrors = stats->tx.tx_errors; + r_stats->oerrors = stats->tx.tx_errors + + rte_atomic64_read(&soft_stats->tx_oversized); r_stats->imissed = stats->rx.rx_no_bufs + rx_truncated; diff --git a/drivers/net/enic/enic_res.c b/drivers/net/enic/enic_res.c index 8a230a1664..867bd25c48 100644 --- a/drivers/net/enic/enic_res.c +++ b/drivers/net/enic/enic_res.c @@ -89,10 +89,11 @@ int enic_get_vnic_config(struct enic *enic) /* max packet size is only defined in newer VIC firmware * and will be 0 for legacy firmware and VICs */ - if (c->max_pkt_size > ENIC_DEFAULT_MAX_PKT_SIZE) + if (c->max_pkt_size > ENIC_DEFAULT_RX_MAX_PKT_SIZE) enic->max_mtu = c->max_pkt_size - (ETHER_HDR_LEN + 4); else - enic->max_mtu = ENIC_DEFAULT_MAX_PKT_SIZE - (ETHER_HDR_LEN + 4); + enic->max_mtu = ENIC_DEFAULT_RX_MAX_PKT_SIZE + - (ETHER_HDR_LEN + 4); if (c->mtu == 0) c->mtu = 1500; diff --git a/drivers/net/enic/enic_res.h b/drivers/net/enic/enic_res.h index 303530efbc..1135d2e1d6 100644 --- a/drivers/net/enic/enic_res.h +++ b/drivers/net/enic/enic_res.h @@ -48,7 +48,10 @@ #define ENIC_MIN_MTU 68 /* Does not include (possible) inserted VLAN tag and FCS */ -#define ENIC_DEFAULT_MAX_PKT_SIZE 9022 +#define ENIC_DEFAULT_RX_MAX_PKT_SIZE 9022 + +/* Does not include (possible) inserted VLAN tag and FCS */ +#define ENIC_TX_MAX_PKT_SIZE 9208 #define ENIC_MULTICAST_PERFECT_FILTERS 32 #define ENIC_UNICAST_PERFECT_FILTERS 32 diff --git a/drivers/net/enic/enic_rxtx.c b/drivers/net/enic/enic_rxtx.c index 26b83ae9b2..343dabc644 100644 --- a/drivers/net/enic/enic_rxtx.c +++ b/drivers/net/enic/enic_rxtx.c @@ -546,16 +546,23 @@ uint16_t enic_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, for (index = 0; index < nb_pkts; index++) { tx_pkt = *tx_pkts++; + pkt_len = tx_pkt->pkt_len; + data_len = tx_pkt->data_len; + ol_flags = tx_pkt->ol_flags; nb_segs = tx_pkt->nb_segs; + + if (pkt_len > ENIC_TX_MAX_PKT_SIZE) { + rte_pktmbuf_free(tx_pkt); + rte_atomic64_inc(&enic->soft_stats.tx_oversized); + continue; + } + if (nb_segs > wq_desc_avail) { if (index > 0) goto post; goto done; } - pkt_len = tx_pkt->pkt_len; - data_len = tx_pkt->data_len; - ol_flags = tx_pkt->ol_flags; mss = 0; vlan_id = 0; vlan_tag_insert = 0; -- 2.20.1