From: Faisal Latif Date: Sat, 22 Nov 2008 02:50:49 +0000 (-0600) Subject: RDMA/nes: Forward packets for a new connection with stale APBVT entry X-Git-Tag: v2.6.29-rc1~583^2^6~5 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=4a14f6a79f5110c6033f0c61d77d07c449c2d083;p=linux-2.6-omap-h63xx.git RDMA/nes: Forward packets for a new connection with stale APBVT entry Under heavy traffic, there is a small windows when an APBVT entry is not yet removed and a new connection is established. Packets for the new connection are dropped until APBVT entry is removed. This patch will forward the packets instead of dropping them. Signed-off-by: Faisal Latif Signed-off-by: Chien Tung Signed-off-by: Roland Dreier --- diff --git a/drivers/infiniband/hw/nes/nes_cm.c b/drivers/infiniband/hw/nes/nes_cm.c index c259ddc8dd8..f34fa6f77a8 100644 --- a/drivers/infiniband/hw/nes/nes_cm.c +++ b/drivers/infiniband/hw/nes/nes_cm.c @@ -86,7 +86,7 @@ static int mini_cm_accept(struct nes_cm_core *, struct ietf_mpa_frame *, struct nes_cm_node *); static int mini_cm_reject(struct nes_cm_core *, struct ietf_mpa_frame *, struct nes_cm_node *); -static void mini_cm_recv_pkt(struct nes_cm_core *, struct nes_vnic *, +static int mini_cm_recv_pkt(struct nes_cm_core *, struct nes_vnic *, struct sk_buff *); static int mini_cm_dealloc_core(struct nes_cm_core *); static int mini_cm_get(struct nes_cm_core *); @@ -2076,7 +2076,7 @@ static int mini_cm_close(struct nes_cm_core *cm_core, struct nes_cm_node *cm_nod * recv_pkt - recv an ETHERNET packet, and process it through CM * node state machine */ -static void mini_cm_recv_pkt(struct nes_cm_core *cm_core, +static int mini_cm_recv_pkt(struct nes_cm_core *cm_core, struct nes_vnic *nesvnic, struct sk_buff *skb) { struct nes_cm_node *cm_node = NULL; @@ -2084,23 +2084,16 @@ static void mini_cm_recv_pkt(struct nes_cm_core *cm_core, struct iphdr *iph; struct tcphdr *tcph; struct nes_cm_info nfo; + int skb_handled = 1; if (!skb) - return; + return 0; if (skb->len < sizeof(struct iphdr) + sizeof(struct tcphdr)) { - dev_kfree_skb_any(skb); - return; + return 0; } iph = (struct iphdr *)skb->data; tcph = (struct tcphdr *)(skb->data + sizeof(struct iphdr)); - skb_reset_network_header(skb); - skb_set_transport_header(skb, sizeof(*tcph)); - if (!tcph) { - dev_kfree_skb_any(skb); - return; - } - skb->len = ntohs(iph->tot_len); nfo.loc_addr = ntohl(iph->daddr); nfo.loc_port = ntohs(tcph->dest); @@ -2121,23 +2114,21 @@ static void mini_cm_recv_pkt(struct nes_cm_core *cm_core, /* Only type of packet accepted are for */ /* the PASSIVE open (syn only) */ if ((!tcph->syn) || (tcph->ack)) { - cm_packets_dropped++; + skb_handled = 0; break; } listener = find_listener(cm_core, nfo.loc_addr, nfo.loc_port, NES_CM_LISTENER_ACTIVE_STATE); - if (listener) { - nfo.cm_id = listener->cm_id; - nfo.conn_type = listener->conn_type; - } else { - nes_debug(NES_DBG_CM, "Unable to find listener " - "for the pkt\n"); - cm_packets_dropped++; - dev_kfree_skb_any(skb); + if (!listener) { + nfo.cm_id = NULL; + nfo.conn_type = 0; + nes_debug(NES_DBG_CM, "Unable to find listener for the pkt\n"); + skb_handled = 0; break; } - + nfo.cm_id = listener->cm_id; + nfo.conn_type = listener->conn_type; cm_node = make_cm_node(cm_core, nesvnic, &nfo, listener); if (!cm_node) { @@ -2163,9 +2154,13 @@ static void mini_cm_recv_pkt(struct nes_cm_core *cm_core, dev_kfree_skb_any(skb); break; } + skb_reset_network_header(skb); + skb_set_transport_header(skb, sizeof(*tcph)); + skb->len = ntohs(iph->tot_len); process_packet(cm_node, skb, cm_core); rem_ref_cm_node(cm_core, cm_node); } while (0); + return skb_handled; } @@ -2985,15 +2980,16 @@ int nes_destroy_listen(struct iw_cm_id *cm_id) */ int nes_cm_recv(struct sk_buff *skb, struct net_device *netdevice) { + int rc = 0; cm_packets_received++; if ((g_cm_core) && (g_cm_core->api)) { - g_cm_core->api->recv_pkt(g_cm_core, netdev_priv(netdevice), skb); + rc = g_cm_core->api->recv_pkt(g_cm_core, netdev_priv(netdevice), skb); } else { nes_debug(NES_DBG_CM, "Unable to process packet for CM," " cm is not setup properly.\n"); } - return 0; + return rc; } diff --git a/drivers/infiniband/hw/nes/nes_cm.h b/drivers/infiniband/hw/nes/nes_cm.h index 25e2493abc6..3a20a788397 100644 --- a/drivers/infiniband/hw/nes/nes_cm.h +++ b/drivers/infiniband/hw/nes/nes_cm.h @@ -397,7 +397,7 @@ struct nes_cm_ops { struct nes_cm_node *); int (*reject)(struct nes_cm_core *, struct ietf_mpa_frame *, struct nes_cm_node *); - void (*recv_pkt)(struct nes_cm_core *, struct nes_vnic *, + int (*recv_pkt)(struct nes_cm_core *, struct nes_vnic *, struct sk_buff *); int (*destroy_cm_core)(struct nes_cm_core *); int (*get)(struct nes_cm_core *); diff --git a/drivers/infiniband/hw/nes/nes_hw.c b/drivers/infiniband/hw/nes/nes_hw.c index 7c49cc882d7..8f70ff2dcc5 100644 --- a/drivers/infiniband/hw/nes/nes_hw.c +++ b/drivers/infiniband/hw/nes/nes_hw.c @@ -2700,27 +2700,33 @@ void nes_nic_ce_handler(struct nes_device *nesdev, struct nes_hw_nic_cq *cq) pkt_type, (pkt_type & NES_PKT_TYPE_APBVT_MASK)); */ if ((pkt_type & NES_PKT_TYPE_APBVT_MASK) == NES_PKT_TYPE_APBVT_BITS) { - nes_cm_recv(rx_skb, nesvnic->netdev); + if (nes_cm_recv(rx_skb, nesvnic->netdev)) + rx_skb = NULL; + } + if (rx_skb == NULL) + goto skip_rx_indicate0; + + + if ((cqe_misc & NES_NIC_CQE_TAG_VALID) && + (nesvnic->vlan_grp != NULL)) { + vlan_tag = (u16)(le32_to_cpu( + cq->cq_vbase[head].cqe_words[NES_NIC_CQE_TAG_PKT_TYPE_IDX]) + >> 16); + nes_debug(NES_DBG_CQ, "%s: Reporting stripped VLAN packet. Tag = 0x%04X\n", + nesvnic->netdev->name, vlan_tag); + if (nes_use_lro) + lro_vlan_hwaccel_receive_skb(&nesvnic->lro_mgr, rx_skb, + nesvnic->vlan_grp, vlan_tag, NULL); + else + nes_vlan_rx(rx_skb, nesvnic->vlan_grp, vlan_tag); } else { - if ((cqe_misc & NES_NIC_CQE_TAG_VALID) && (nesvnic->vlan_grp != NULL)) { - vlan_tag = (u16)(le32_to_cpu( - cq->cq_vbase[head].cqe_words[NES_NIC_CQE_TAG_PKT_TYPE_IDX]) - >> 16); - nes_debug(NES_DBG_CQ, "%s: Reporting stripped VLAN packet. Tag = 0x%04X\n", - nesvnic->netdev->name, vlan_tag); - if (nes_use_lro) - lro_vlan_hwaccel_receive_skb(&nesvnic->lro_mgr, rx_skb, - nesvnic->vlan_grp, vlan_tag, NULL); - else - nes_vlan_rx(rx_skb, nesvnic->vlan_grp, vlan_tag); - } else { - if (nes_use_lro) - lro_receive_skb(&nesvnic->lro_mgr, rx_skb, NULL); - else - nes_netif_rx(rx_skb); - } + if (nes_use_lro) + lro_receive_skb(&nesvnic->lro_mgr, rx_skb, NULL); + else + nes_netif_rx(rx_skb); } +skip_rx_indicate0: nesvnic->netdev->last_rx = jiffies; /* nesvnic->netstats.rx_packets++; */ /* nesvnic->netstats.rx_bytes += rx_pkt_size; */