From: Ajit Khaparde Date: Wed, 24 Apr 2013 11:52:50 +0000 (+0000) Subject: be2net: fix a Tx stall bug caused by a specific ipv6 packet X-Git-Tag: v3.10-rc1~132^2~15^2~25 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=bc0c340;p=karo-tx-linux.git be2net: fix a Tx stall bug caused by a specific ipv6 packet The ASIC could lockup in the transmit path when it tries to insert VLAN in a specific ipv6 packet. 1) Identify the packet which can cause this. 2) Check if the firmware provides a workaround to prevent this. 3) If workaround is not present, drop the packet. 4) If the firmware provides a workaround, insert the VLAN tag in the packet and inform the firmware to skip further VLAN insertions. Signed-off-by: Ajit Khaparde Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/emulex/benet/be.h b/drivers/net/ethernet/emulex/benet/be.h index 29aff55f2eea..941aa1f5cf9b 100644 --- a/drivers/net/ethernet/emulex/benet/be.h +++ b/drivers/net/ethernet/emulex/benet/be.h @@ -328,6 +328,7 @@ enum vf_state { #define BE_FLAGS_WORKER_SCHEDULED (1 << 3) #define BE_UC_PMAC_COUNT 30 #define BE_VF_UC_PMAC_COUNT 2 +#define BE_FLAGS_QNQ_ASYNC_EVT_RCVD (1 << 11) struct phy_info { u8 transceiver; @@ -434,6 +435,7 @@ struct be_adapter { u8 wol_cap; bool wol; u32 uc_macs; /* Count of secondary UC MAC programmed */ + u16 qnq_vid; u32 msg_enable; int be_get_temp_freq; u16 max_mcast_mac; @@ -648,6 +650,11 @@ static inline bool be_is_wol_excluded(struct be_adapter *adapter) } } +static inline int qnq_async_evt_rcvd(struct be_adapter *adapter) +{ + return adapter->flags & BE_FLAGS_QNQ_ASYNC_EVT_RCVD; +} + extern void be_cq_notify(struct be_adapter *adapter, u16 qid, bool arm, u16 num_popped); extern void be_link_status_update(struct be_adapter *adapter, u8 link_status); diff --git a/drivers/net/ethernet/emulex/benet/be_cmds.c b/drivers/net/ethernet/emulex/benet/be_cmds.c index 3c9b4f12e3e5..ce5af9b3b704 100644 --- a/drivers/net/ethernet/emulex/benet/be_cmds.c +++ b/drivers/net/ethernet/emulex/benet/be_cmds.c @@ -263,6 +263,27 @@ static void be_async_grp5_evt_process(struct be_adapter *adapter, } } +static void be_async_dbg_evt_process(struct be_adapter *adapter, + u32 trailer, struct be_mcc_compl *cmp) +{ + u8 event_type = 0; + struct be_async_event_qnq *evt = (struct be_async_event_qnq *) cmp; + + event_type = (trailer >> ASYNC_TRAILER_EVENT_TYPE_SHIFT) & + ASYNC_TRAILER_EVENT_TYPE_MASK; + + switch (event_type) { + case ASYNC_DEBUG_EVENT_TYPE_QNQ: + if (evt->valid) + adapter->qnq_vid = le16_to_cpu(evt->vlan_tag); + adapter->flags |= BE_FLAGS_QNQ_ASYNC_EVT_RCVD; + break; + default: + dev_warn(&adapter->pdev->dev, "Unknown debug event\n"); + break; + } +} + static inline bool is_link_state_evt(u32 trailer) { return ((trailer >> ASYNC_TRAILER_EVENT_CODE_SHIFT) & @@ -277,6 +298,13 @@ static inline bool is_grp5_evt(u32 trailer) ASYNC_EVENT_CODE_GRP_5); } +static inline bool is_dbg_evt(u32 trailer) +{ + return (((trailer >> ASYNC_TRAILER_EVENT_CODE_SHIFT) & + ASYNC_TRAILER_EVENT_CODE_MASK) == + ASYNC_EVENT_CODE_QNQ); +} + static struct be_mcc_compl *be_mcc_compl_get(struct be_adapter *adapter) { struct be_queue_info *mcc_cq = &adapter->mcc_obj.cq; @@ -325,6 +353,9 @@ int be_process_mcc(struct be_adapter *adapter) else if (is_grp5_evt(compl->flags)) be_async_grp5_evt_process(adapter, compl->flags, compl); + else if (is_dbg_evt(compl->flags)) + be_async_dbg_evt_process(adapter, + compl->flags, compl); } else if (compl->flags & CQE_FLAGS_COMPLETED_MASK) { status = be_mcc_compl_process(adapter, compl); atomic_dec(&mcc_obj->q.used); @@ -1022,6 +1053,7 @@ int be_cmd_mccq_ext_create(struct be_adapter *adapter, /* Subscribe to Link State and Group 5 Events(bits 1 and 5 set) */ req->async_event_bitmap[0] = cpu_to_le32(0x00000022); + req->async_event_bitmap[0] |= cpu_to_le32(1 << ASYNC_EVENT_CODE_QNQ); be_dws_cpu_to_le(ctxt, sizeof(req->context)); be_cmd_page_addrs_prepare(req->pages, ARRAY_SIZE(req->pages), q_mem); diff --git a/drivers/net/ethernet/emulex/benet/be_cmds.h b/drivers/net/ethernet/emulex/benet/be_cmds.h index 96970860c915..07fd9277d3cb 100644 --- a/drivers/net/ethernet/emulex/benet/be_cmds.h +++ b/drivers/net/ethernet/emulex/benet/be_cmds.h @@ -84,6 +84,9 @@ struct be_mcc_compl { #define ASYNC_EVENT_QOS_SPEED 0x1 #define ASYNC_EVENT_COS_PRIORITY 0x2 #define ASYNC_EVENT_PVID_STATE 0x3 +#define ASYNC_EVENT_CODE_QNQ 0x6 +#define ASYNC_DEBUG_EVENT_TYPE_QNQ 1 + struct be_async_event_trailer { u32 code; }; @@ -144,6 +147,16 @@ struct be_async_event_grp5_pvid_state { struct be_async_event_trailer trailer; } __packed; +/* async event indicating outer VLAN tag in QnQ */ +struct be_async_event_qnq { + u8 valid; /* Indicates if outer VLAN is valid */ + u8 rsvd0; + u16 vlan_tag; + u32 event_tag; + u8 rsvd1[4]; + struct be_async_event_trailer trailer; +} __packed; + struct be_mcc_mailbox { struct be_mcc_wrb wrb; struct be_mcc_compl compl; diff --git a/drivers/net/ethernet/emulex/benet/be_main.c b/drivers/net/ethernet/emulex/benet/be_main.c index a254942ed5a6..21109b59fcfc 100644 --- a/drivers/net/ethernet/emulex/benet/be_main.c +++ b/drivers/net/ethernet/emulex/benet/be_main.c @@ -627,7 +627,7 @@ static inline u16 be_get_tx_vlan_tag(struct be_adapter *adapter, } static void wrb_fill_hdr(struct be_adapter *adapter, struct be_eth_hdr_wrb *hdr, - struct sk_buff *skb, u32 wrb_cnt, u32 len) + struct sk_buff *skb, u32 wrb_cnt, u32 len, bool skip_hw_vlan) { u16 vlan_tag; @@ -654,8 +654,9 @@ static void wrb_fill_hdr(struct be_adapter *adapter, struct be_eth_hdr_wrb *hdr, AMAP_SET_BITS(struct amap_eth_hdr_wrb, vlan_tag, hdr, vlan_tag); } + /* To skip HW VLAN tagging: evt = 1, compl = 0 */ + AMAP_SET_BITS(struct amap_eth_hdr_wrb, complete, hdr, !skip_hw_vlan); AMAP_SET_BITS(struct amap_eth_hdr_wrb, event, hdr, 1); - AMAP_SET_BITS(struct amap_eth_hdr_wrb, complete, hdr, 1); AMAP_SET_BITS(struct amap_eth_hdr_wrb, num_wrb, hdr, wrb_cnt); AMAP_SET_BITS(struct amap_eth_hdr_wrb, len, hdr, len); } @@ -678,7 +679,8 @@ static void unmap_tx_frag(struct device *dev, struct be_eth_wrb *wrb, } static int make_tx_wrbs(struct be_adapter *adapter, struct be_queue_info *txq, - struct sk_buff *skb, u32 wrb_cnt, bool dummy_wrb) + struct sk_buff *skb, u32 wrb_cnt, bool dummy_wrb, + bool skip_hw_vlan) { dma_addr_t busaddr; int i, copied = 0; @@ -727,7 +729,7 @@ static int make_tx_wrbs(struct be_adapter *adapter, struct be_queue_info *txq, queue_head_inc(txq); } - wrb_fill_hdr(adapter, hdr, first_skb, wrb_cnt, copied); + wrb_fill_hdr(adapter, hdr, first_skb, wrb_cnt, copied, skip_hw_vlan); be_dws_cpu_to_le(hdr, sizeof(*hdr)); return copied; @@ -744,7 +746,8 @@ dma_err: } static struct sk_buff *be_insert_vlan_in_pkt(struct be_adapter *adapter, - struct sk_buff *skb) + struct sk_buff *skb, + bool *skip_hw_vlan) { u16 vlan_tag = 0; @@ -759,9 +762,67 @@ static struct sk_buff *be_insert_vlan_in_pkt(struct be_adapter *adapter, skb->vlan_tci = 0; } + if (qnq_async_evt_rcvd(adapter) && adapter->pvid) { + if (!vlan_tag) + vlan_tag = adapter->pvid; + if (skip_hw_vlan) + *skip_hw_vlan = true; + } + + if (vlan_tag) { + skb = __vlan_put_tag(skb, vlan_tag); + if (unlikely(!skb)) + return skb; + + skb->vlan_tci = 0; + } + + /* Insert the outer VLAN, if any */ + if (adapter->qnq_vid) { + vlan_tag = adapter->qnq_vid; + skb = __vlan_put_tag(skb, vlan_tag); + if (unlikely(!skb)) + return skb; + if (skip_hw_vlan) + *skip_hw_vlan = true; + } + return skb; } +static bool be_ipv6_exthdr_check(struct sk_buff *skb) +{ + struct ethhdr *eh = (struct ethhdr *)skb->data; + u16 offset = ETH_HLEN; + + if (eh->h_proto == htons(ETH_P_IPV6)) { + struct ipv6hdr *ip6h = (struct ipv6hdr *)(skb->data + offset); + + offset += sizeof(struct ipv6hdr); + if (ip6h->nexthdr != NEXTHDR_TCP && + ip6h->nexthdr != NEXTHDR_UDP) { + struct ipv6_opt_hdr *ehdr = + (struct ipv6_opt_hdr *) (skb->data + offset); + + /* offending pkt: 2nd byte following IPv6 hdr is 0xff */ + if (ehdr->hdrlen == 0xff) + return true; + } + } + return false; +} + +static int be_vlan_tag_tx_chk(struct be_adapter *adapter, struct sk_buff *skb) +{ + return vlan_tx_tag_present(skb) || adapter->pvid || adapter->qnq_vid; +} + +static int be_ipv6_tx_stall_chk(struct be_adapter *adapter, struct sk_buff *skb) +{ + return BE3_chip(adapter) && + be_ipv6_exthdr_check(skb); +} + static netdev_tx_t be_xmit(struct sk_buff *skb, struct net_device *netdev) { @@ -772,6 +833,7 @@ static netdev_tx_t be_xmit(struct sk_buff *skb, u32 wrb_cnt = 0, copied = 0; u32 start = txq->head, eth_hdr_len; bool dummy_wrb, stopped = false; + bool skip_hw_vlan = false; eth_hdr_len = ntohs(skb->protocol) == ETH_P_8021Q ? VLAN_ETH_HLEN : ETH_HLEN; @@ -790,14 +852,37 @@ static netdev_tx_t be_xmit(struct sk_buff *skb, */ if (skb->ip_summed != CHECKSUM_PARTIAL && vlan_tx_tag_present(skb)) { - skb = be_insert_vlan_in_pkt(adapter, skb); + skb = be_insert_vlan_in_pkt(adapter, skb, &skip_hw_vlan); + if (unlikely(!skb)) + goto tx_drop; + } + + /* HW may lockup when VLAN HW tagging is requested on + * certain ipv6 packets. Drop such pkts if the HW workaround to + * skip HW tagging is not enabled by FW. + */ + if (unlikely(be_ipv6_tx_stall_chk(adapter, skb) && + (adapter->pvid || adapter->qnq_vid) && + !qnq_async_evt_rcvd(adapter))) + goto tx_drop; + + /* Manual VLAN tag insertion to prevent: + * ASIC lockup when the ASIC inserts VLAN tag into + * certain ipv6 packets. Insert VLAN tags in driver, + * and set event, completion, vlan bits accordingly + * in the Tx WRB. + */ + if (be_ipv6_tx_stall_chk(adapter, skb) && + be_vlan_tag_tx_chk(adapter, skb)) { + skb = be_insert_vlan_in_pkt(adapter, skb, &skip_hw_vlan); if (unlikely(!skb)) goto tx_drop; } wrb_cnt = wrb_cnt_for_skb(adapter, skb, &dummy_wrb); - copied = make_tx_wrbs(adapter, txq, skb, wrb_cnt, dummy_wrb); + copied = make_tx_wrbs(adapter, txq, skb, wrb_cnt, dummy_wrb, + skip_hw_vlan); if (copied) { int gso_segs = skb_shinfo(skb)->gso_segs;