qed: iWARP CM add listener functions and initial SYN processing

This patch adds the ability to add and remove listeners and identify
whether the SYN packet received is intended for iWARP or not. If
a listener is not found the SYN packet is posted back to the chip.

Signed-off-by: Michal Kalderon <Michal.Kalderon@cavium.com>
Signed-off-by: Yuval Mintz <Yuval.Mintz@cavium.com>
Signed-off-by: Ariel Elior <Ariel.Elior@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 266 insertions, 3 deletions

diff --git a/drivers/net/ethernet/qlogic/qed/qed_iwarp.c b/drivers/net/ethernet/qlogic/qed/qed_iwarp.c
index f3b4b32100f5..2bab57c6bae8 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_iwarp.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_iwarp.c
@@ -31,6 +31,10 @@
  */
 #include <linux/if_ether.h>
 #include <linux/if_vlan.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <linux/spinlock.h>
+#include <linux/tcp.h>
 #include "qed_cxt.h"
 #include "qed_hw.h"
 #include "qed_ll2.h"
@@ -477,6 +481,31 @@ void qed_iwarp_resc_free(struct qed_hwfn *p_hwfn)
 {
 }
 
+static void
+qed_iwarp_print_cm_info(struct qed_hwfn *p_hwfn,
+			struct qed_iwarp_cm_info *cm_info)
+{
+	DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "ip_version = %d\n",
+		   cm_info->ip_version);
+
+	if (cm_info->ip_version == QED_TCP_IPV4)
+		DP_VERBOSE(p_hwfn, QED_MSG_RDMA,
+			   "remote_ip %pI4h:%x, local_ip %pI4h:%x vlan=%x\n",
+			   cm_info->remote_ip, cm_info->remote_port,
+			   cm_info->local_ip, cm_info->local_port,
+			   cm_info->vlan);
+	else
+		DP_VERBOSE(p_hwfn, QED_MSG_RDMA,
+			   "remote_ip %pI6h:%x, local_ip %pI6h:%x vlan=%x\n",
+			   cm_info->remote_ip, cm_info->remote_port,
+			   cm_info->local_ip, cm_info->local_port,
+			   cm_info->vlan);
+
+	DP_VERBOSE(p_hwfn, QED_MSG_RDMA,
+		   "private_data_len = %x ord = %d, ird = %d\n",
+		   cm_info->private_data_len, cm_info->ord, cm_info->ird);
+}
+
 static int
 qed_iwarp_ll2_post_rx(struct qed_hwfn *p_hwfn,
 		      struct qed_iwarp_ll2_buff *buf, u8 handle)
@@ -497,11 +526,147 @@ qed_iwarp_ll2_post_rx(struct qed_hwfn *p_hwfn,
 	return rc;
 }
 
+static struct qed_iwarp_listener *
+qed_iwarp_get_listener(struct qed_hwfn *p_hwfn,
+		       struct qed_iwarp_cm_info *cm_info)
+{
+	struct qed_iwarp_listener *listener = NULL;
+	static const u32 ip_zero[4] = { 0, 0, 0, 0 };
+	bool found = false;
+
+	qed_iwarp_print_cm_info(p_hwfn, cm_info);
+
+	list_for_each_entry(listener,
+			    &p_hwfn->p_rdma_info->iwarp.listen_list,
+			    list_entry) {
+		if (listener->port == cm_info->local_port) {
+			if (!memcmp(listener->ip_addr,
+				    ip_zero, sizeof(ip_zero))) {
+				found = true;
+				break;
+			}
+
+			if (!memcmp(listener->ip_addr,
+				    cm_info->local_ip,
+				    sizeof(cm_info->local_ip)) &&
+			    (listener->vlan == cm_info->vlan)) {
+				found = true;
+				break;
+			}
+		}
+	}
+
+	if (found) {
+		DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "listener found = %p\n",
+			   listener);
+		return listener;
+	}
+
+	DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "listener not found\n");
+	return NULL;
+}
+
+static int
+qed_iwarp_parse_rx_pkt(struct qed_hwfn *p_hwfn,
+		       struct qed_iwarp_cm_info *cm_info,
+		       void *buf,
+		       u8 *remote_mac_addr,
+		       u8 *local_mac_addr,
+		       int *payload_len, int *tcp_start_offset)
+{
+	struct vlan_ethhdr *vethh;
+	bool vlan_valid = false;
+	struct ipv6hdr *ip6h;
+	struct ethhdr *ethh;
+	struct tcphdr *tcph;
+	struct iphdr *iph;
+	int eth_hlen;
+	int ip_hlen;
+	int eth_type;
+	int i;
+
+	ethh = buf;
+	eth_type = ntohs(ethh->h_proto);
+	if (eth_type == ETH_P_8021Q) {
+		vlan_valid = true;
+		vethh = (struct vlan_ethhdr *)ethh;
+		cm_info->vlan = ntohs(vethh->h_vlan_TCI) & VLAN_VID_MASK;
+		eth_type = ntohs(vethh->h_vlan_encapsulated_proto);
+	}
+
+	eth_hlen = ETH_HLEN + (vlan_valid ? sizeof(u32) : 0);
+
+	memcpy(remote_mac_addr, ethh->h_source, ETH_ALEN);
+
+	memcpy(local_mac_addr, ethh->h_dest, ETH_ALEN);
+
+	DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "eth_type =%d source mac: %pM\n",
+		   eth_type, ethh->h_source);
+
+	DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "eth_hlen=%d destination mac: %pM\n",
+		   eth_hlen, ethh->h_dest);
+
+	iph = (struct iphdr *)((u8 *)(ethh) + eth_hlen);
+
+	if (eth_type == ETH_P_IP) {
+		cm_info->local_ip[0] = ntohl(iph->daddr);
+		cm_info->remote_ip[0] = ntohl(iph->saddr);
+		cm_info->ip_version = TCP_IPV4;
+
+		ip_hlen = (iph->ihl) * sizeof(u32);
+		*payload_len = ntohs(iph->tot_len) - ip_hlen;
+	} else if (eth_type == ETH_P_IPV6) {
+		ip6h = (struct ipv6hdr *)iph;
+		for (i = 0; i < 4; i++) {
+			cm_info->local_ip[i] =
+			    ntohl(ip6h->daddr.in6_u.u6_addr32[i]);
+			cm_info->remote_ip[i] =
+			    ntohl(ip6h->saddr.in6_u.u6_addr32[i]);
+		}
+		cm_info->ip_version = TCP_IPV6;
+
+		ip_hlen = sizeof(*ip6h);
+		*payload_len = ntohs(ip6h->payload_len);
+	} else {
+		DP_NOTICE(p_hwfn, "Unexpected ethertype on ll2 %x\n", eth_type);
+		return -EINVAL;
+	}
+
+	tcph = (struct tcphdr *)((u8 *)iph + ip_hlen);
+
+	if (!tcph->syn) {
+		DP_NOTICE(p_hwfn,
+			  "Only SYN type packet expected on this ll2 conn, iph->ihl=%d source=%d dest=%d\n",
+			  iph->ihl, tcph->source, tcph->dest);
+		return -EINVAL;
+	}
+
+	cm_info->local_port = ntohs(tcph->dest);
+	cm_info->remote_port = ntohs(tcph->source);
+
+	qed_iwarp_print_cm_info(p_hwfn, cm_info);
+
+	*tcp_start_offset = eth_hlen + ip_hlen;
+
+	return 0;
+}
+
 static void
 qed_iwarp_ll2_comp_syn_pkt(void *cxt, struct qed_ll2_comp_rx_data *data)
 {
 	struct qed_iwarp_ll2_buff *buf = data->cookie;
+	struct qed_iwarp_listener *listener;
+	struct qed_ll2_tx_pkt_info tx_pkt;
+	struct qed_iwarp_cm_info cm_info;
 	struct qed_hwfn *p_hwfn = cxt;
+	u8 remote_mac_addr[ETH_ALEN];
+	u8 local_mac_addr[ETH_ALEN];
+	int tcp_start_offset;
+	u8 ll2_syn_handle;
+	int payload_len;
+	int rc;
+
+	memset(&cm_info, 0, sizeof(cm_info));
 
 	if (GET_FIELD(data->parse_flags,
 		      PARSING_AND_ERR_FLAGS_L4CHKSMWASCALCULATED) &&
@@ -510,11 +675,52 @@ qed_iwarp_ll2_comp_syn_pkt(void *cxt, struct qed_ll2_comp_rx_data *data)
 		goto err;
 	}
 
-	/* Process SYN packet - added later on in series */
+	rc = qed_iwarp_parse_rx_pkt(p_hwfn, &cm_info, (u8 *)(buf->data) +
+				    data->u.placement_offset, remote_mac_addr,
+				    local_mac_addr, &payload_len,
+				    &tcp_start_offset);
+	if (rc)
+		goto err;
+
+	/* Check if there is a listener for this 4-tuple+vlan */
+	ll2_syn_handle = p_hwfn->p_rdma_info->iwarp.ll2_syn_handle;
+	listener = qed_iwarp_get_listener(p_hwfn, &cm_info);
+	if (!listener) {
+		DP_VERBOSE(p_hwfn,
+			   QED_MSG_RDMA,
+			   "SYN received on tuple not listened on parse_flags=%d packet len=%d\n",
+			   data->parse_flags, data->length.packet_length);
+
+		memset(&tx_pkt, 0, sizeof(tx_pkt));
+		tx_pkt.num_of_bds = 1;
+		tx_pkt.vlan = data->vlan;
+
+		if (GET_FIELD(data->parse_flags,
+			      PARSING_AND_ERR_FLAGS_TAG8021QEXIST))
+			SET_FIELD(tx_pkt.bd_flags,
+				  CORE_TX_BD_DATA_VLAN_INSERTION, 1);
+
+		tx_pkt.l4_hdr_offset_w = (data->length.packet_length) >> 2;
+		tx_pkt.tx_dest = QED_LL2_TX_DEST_LB;
+		tx_pkt.first_frag = buf->data_phys_addr +
+				    data->u.placement_offset;
+		tx_pkt.first_frag_len = data->length.packet_length;
+		tx_pkt.cookie = buf;
+
+		rc = qed_ll2_prepare_tx_packet(p_hwfn, ll2_syn_handle,
+					       &tx_pkt, true);
+
+		if (rc) {
+			DP_NOTICE(p_hwfn,
+				  "Can't post SYN back to chip rc=%d\n", rc);
+			goto err;
+		}
+		return;
+	}
 
+	DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "Received syn on listening port\n");
 err:
-	qed_iwarp_ll2_post_rx(p_hwfn, buf,
-			      p_hwfn->p_rdma_info->iwarp.ll2_syn_handle);
+	qed_iwarp_ll2_post_rx(p_hwfn, buf, ll2_syn_handle);
 }
 
 static void qed_iwarp_ll2_rel_rx_pkt(void *cxt, u8 connection_handle,
@@ -700,6 +906,7 @@ int qed_iwarp_setup(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt,
 	iwarp_info->peer2peer = QED_IWARP_PARAM_P2P;
 
 	spin_lock_init(&p_hwfn->p_rdma_info->iwarp.qp_lock);
+	INIT_LIST_HEAD(&p_hwfn->p_rdma_info->iwarp.listen_list);
 
 	qed_spq_register_async_cb(p_hwfn, PROTOCOLID_IWARP,
 				  qed_iwarp_async_event);
@@ -728,6 +935,62 @@ static int qed_iwarp_async_event(struct qed_hwfn *p_hwfn,
 	return 0;
 }
 
+int
+qed_iwarp_create_listen(void *rdma_cxt,
+			struct qed_iwarp_listen_in *iparams,
+			struct qed_iwarp_listen_out *oparams)
+{
+	struct qed_hwfn *p_hwfn = rdma_cxt;
+	struct qed_iwarp_listener *listener;
+
+	listener = kzalloc(sizeof(*listener), GFP_KERNEL);
+	if (!listener)
+		return -ENOMEM;
+
+	listener->ip_version = iparams->ip_version;
+	memcpy(listener->ip_addr, iparams->ip_addr, sizeof(listener->ip_addr));
+	listener->port = iparams->port;
+	listener->vlan = iparams->vlan;
+
+	listener->event_cb = iparams->event_cb;
+	listener->cb_context = iparams->cb_context;
+	listener->max_backlog = iparams->max_backlog;
+	oparams->handle = listener;
+
+	spin_lock_bh(&p_hwfn->p_rdma_info->iwarp.iw_lock);
+	list_add_tail(&listener->list_entry,
+		      &p_hwfn->p_rdma_info->iwarp.listen_list);
+	spin_unlock_bh(&p_hwfn->p_rdma_info->iwarp.iw_lock);
+
+	DP_VERBOSE(p_hwfn,
+		   QED_MSG_RDMA,
+		   "callback=%p handle=%p ip=%x:%x:%x:%x port=0x%x vlan=0x%x\n",
+		   listener->event_cb,
+		   listener,
+		   listener->ip_addr[0],
+		   listener->ip_addr[1],
+		   listener->ip_addr[2],
+		   listener->ip_addr[3], listener->port, listener->vlan);
+
+	return 0;
+}
+
+int qed_iwarp_destroy_listen(void *rdma_cxt, void *handle)
+{
+	struct qed_iwarp_listener *listener = handle;
+	struct qed_hwfn *p_hwfn = rdma_cxt;
+
+	DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "handle=%p\n", handle);
+
+	spin_lock_bh(&p_hwfn->p_rdma_info->iwarp.iw_lock);
+	list_del(&listener->list_entry);
+	spin_unlock_bh(&p_hwfn->p_rdma_info->iwarp.iw_lock);
+
+	kfree(listener);
+
+	return 0;
+}
+
 void
 qed_iwarp_query_qp(struct qed_rdma_qp *qp,
 		   struct qed_rdma_query_qp_out_params *out_params)