libcxgbi: Add ipv6 api to driver

Signed-off-by: Anish Bhatt <anish@chelsio.com>
Signed-off-by: Karen Xie <kxie@chelsio.com>
Signed-off-by: Manoj Malviya <manojmalviya@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 237 insertions, 21 deletions

diff --git a/drivers/scsi/cxgbi/libcxgbi.c b/drivers/scsi/cxgbi/libcxgbi.c
index b44c1cff3114..d2fe507fc695 100644
--- a/drivers/scsi/cxgbi/libcxgbi.c
+++ b/drivers/scsi/cxgbi/libcxgbi.c
@@ -24,6 +24,10 @@
 #include <linux/inet.h>
 #include <net/dst.h>
 #include <net/route.h>
+#include <net/ipv6.h>
+#include <net/ip6_route.h>
+#include <net/addrconf.h>
+
 #include <linux/inetdevice.h>	/* ip_dev_find */
 #include <linux/module.h>
 #include <net/tcp.h>
@@ -193,8 +197,8 @@ struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
 }
 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
 
-static struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
-							int *port)
+struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
+						 int *port)
 {
 	struct net_device *vdev = NULL;
 	struct cxgbi_device *cdev, *tmp;
@@ -224,6 +228,40 @@ static struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
 		"ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 	return NULL;
 }
+EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev);
+
+static struct cxgbi_device *cxgbi_device_find_by_mac(struct net_device *ndev,
+						     int *port)
+{
+	struct net_device *vdev = NULL;
+	struct cxgbi_device *cdev, *tmp;
+	int i;
+
+	if (ndev->priv_flags & IFF_802_1Q_VLAN) {
+		vdev = ndev;
+		ndev = vlan_dev_real_dev(ndev);
+		pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
+	}
+
+	mutex_lock(&cdev_mutex);
+	list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
+		for (i = 0; i < cdev->nports; i++) {
+			if (!memcmp(ndev->dev_addr, cdev->ports[i]->dev_addr,
+				    MAX_ADDR_LEN)) {
+				cdev->hbas[i]->vdev = vdev;
+				mutex_unlock(&cdev_mutex);
+				if (port)
+					*port = i;
+				return cdev;
+			}
+		}
+	}
+	mutex_unlock(&cdev_mutex);
+	log_debug(1 << CXGBI_DBG_DEV,
+		  "ndev 0x%p, %s, NO match mac found.\n",
+		  ndev, ndev->name);
+	return NULL;
+}
 
 void cxgbi_hbas_remove(struct cxgbi_device *cdev)
 {
@@ -320,6 +358,7 @@ static int sock_get_port(struct cxgbi_sock *csk)
 	struct cxgbi_ports_map *pmap = &cdev->pmap;
 	unsigned int start;
 	int idx;
+	__be16 *port;
 
 	if (!pmap->max_connect) {
 		pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
@@ -327,9 +366,14 @@ static int sock_get_port(struct cxgbi_sock *csk)
 		return -EADDRNOTAVAIL;
 	}
 
-	if (csk->saddr.sin_port) {
+	if (csk->csk_family == AF_INET)
+		port = &csk->saddr.sin_port;
+	else /* ipv6 */
+		port = &csk->saddr6.sin6_port;
+
+	if (*port) {
 		pr_err("source port NON-ZERO %u.\n",
-			ntohs(csk->saddr.sin_port));
+			ntohs(*port));
 		return -EADDRINUSE;
 	}
 
@@ -347,8 +391,7 @@ static int sock_get_port(struct cxgbi_sock *csk)
 			idx = 0;
 		if (!pmap->port_csk[idx]) {
 			pmap->used++;
-			csk->saddr.sin_port =
-				htons(pmap->sport_base + idx);
+			*port = htons(pmap->sport_base + idx);
 			pmap->next = idx;
 			pmap->port_csk[idx] = csk;
 			spin_unlock_bh(&pmap->lock);
@@ -374,16 +417,22 @@ static void sock_put_port(struct cxgbi_sock *csk)
 {
 	struct cxgbi_device *cdev = csk->cdev;
 	struct cxgbi_ports_map *pmap = &cdev->pmap;
+	__be16 *port;
 
-	if (csk->saddr.sin_port) {
-		int idx = ntohs(csk->saddr.sin_port) - pmap->sport_base;
+	if (csk->csk_family == AF_INET)
+		port = &csk->saddr.sin_port;
+	else /* ipv6 */
+		port = &csk->saddr6.sin6_port;
 
-		csk->saddr.sin_port = 0;
+	if (*port) {
+		int idx = ntohs(*port) - pmap->sport_base;
+
+		*port = 0;
 		if (idx < 0 || idx >= pmap->max_connect) {
 			pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
 				cdev, csk->port_id,
 				cdev->ports[csk->port_id]->name,
-				ntohs(csk->saddr.sin_port));
+				ntohs(*port));
 			return;
 		}
 
@@ -479,17 +528,11 @@ static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
 	int port = 0xFFFF;
 	int err = 0;
 
-	if (daddr->sin_family != AF_INET) {
-		pr_info("address family 0x%x NOT supported.\n",
-			daddr->sin_family);
-		err = -EAFNOSUPPORT;
-		goto err_out;
-	}
-
 	rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0);
 	if (!rt) {
 		pr_info("no route to ipv4 0x%x, port %u.\n",
-			daddr->sin_addr.s_addr, daddr->sin_port);
+			be32_to_cpu(daddr->sin_addr.s_addr),
+			be16_to_cpu(daddr->sin_port));
 		err = -ENETUNREACH;
 		goto err_out;
 	}
@@ -537,9 +580,12 @@ static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
 	csk->port_id = port;
 	csk->mtu = mtu;
 	csk->dst = dst;
+
+	csk->csk_family = AF_INET;
 	csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
 	csk->daddr.sin_port = daddr->sin_port;
 	csk->daddr.sin_family = daddr->sin_family;
+	csk->saddr.sin_family = daddr->sin_family;
 	csk->saddr.sin_addr.s_addr = fl4.saddr;
 	neigh_release(n);
 
@@ -556,6 +602,121 @@ err_out:
 	return ERR_PTR(err);
 }
 
+static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
+					const struct in6_addr *daddr)
+{
+	struct flowi6 fl;
+
+	if (saddr)
+		memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
+	if (daddr)
+		memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
+	return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
+}
+
+static struct cxgbi_sock *cxgbi_check_route6(struct sockaddr *dst_addr)
+{
+	struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
+	struct dst_entry *dst;
+	struct net_device *ndev;
+	struct cxgbi_device *cdev;
+	struct rt6_info *rt = NULL;
+	struct neighbour *n;
+	struct in6_addr pref_saddr;
+	struct cxgbi_sock *csk = NULL;
+	unsigned int mtu = 0;
+	int port = 0xFFFF;
+	int err = 0;
+
+	rt = find_route_ipv6(NULL, &daddr6->sin6_addr);
+
+	if (!rt) {
+		pr_info("no route to ipv6 %pI6 port %u\n",
+			daddr6->sin6_addr.s6_addr,
+			be16_to_cpu(daddr6->sin6_port));
+		err = -ENETUNREACH;
+		goto err_out;
+	}
+
+	dst = &rt->dst;
+
+	n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
+
+	if (!n) {
+		pr_info("%pI6, port %u, dst no neighbour.\n",
+			daddr6->sin6_addr.s6_addr,
+			be16_to_cpu(daddr6->sin6_port));
+		err = -ENETUNREACH;
+		goto rel_rt;
+	}
+	ndev = n->dev;
+
+	if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
+		pr_info("multi-cast route %pI6 port %u, dev %s.\n",
+			daddr6->sin6_addr.s6_addr,
+			ntohs(daddr6->sin6_port), ndev->name);
+		err = -ENETUNREACH;
+		goto rel_rt;
+	}
+
+	cdev = cxgbi_device_find_by_netdev(ndev, &port);
+	if (!cdev)
+		cdev = cxgbi_device_find_by_mac(ndev, &port);
+	if (!cdev) {
+		pr_info("dst %pI6 %s, NOT cxgbi device.\n",
+			daddr6->sin6_addr.s6_addr, ndev->name);
+		err = -ENETUNREACH;
+		goto rel_rt;
+	}
+	log_debug(1 << CXGBI_DBG_SOCK,
+		  "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
+		  daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
+		  ndev->name, cdev);
+
+	csk = cxgbi_sock_create(cdev);
+	if (!csk) {
+		err = -ENOMEM;
+		goto rel_rt;
+	}
+	csk->cdev = cdev;
+	csk->port_id = port;
+	csk->mtu = mtu;
+	csk->dst = dst;
+
+	if (ipv6_addr_any(&rt->rt6i_prefsrc.addr)) {
+		struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
+
+		err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
+					 &daddr6->sin6_addr, 0, &pref_saddr);
+		if (err) {
+			pr_info("failed to get source address to reach %pI6\n",
+				&daddr6->sin6_addr);
+			goto rel_rt;
+		}
+	} else {
+		pref_saddr = rt->rt6i_prefsrc.addr;
+	}
+
+	csk->csk_family = AF_INET6;
+	csk->daddr6.sin6_addr = daddr6->sin6_addr;
+	csk->daddr6.sin6_port = daddr6->sin6_port;
+	csk->daddr6.sin6_family = daddr6->sin6_family;
+	csk->saddr6.sin6_addr = pref_saddr;
+
+	neigh_release(n);
+	return csk;
+
+rel_rt:
+	if (n)
+		neigh_release(n);
+
+	ip6_rt_put(rt);
+	if (csk)
+		cxgbi_sock_closed(csk);
+err_out:
+	return ERR_PTR(err);
+}
+
 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
 			unsigned int opt)
 {
@@ -2194,6 +2355,34 @@ int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
 }
 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
 
+static inline int csk_print_port(struct cxgbi_sock *csk, char *buf)
+{
+	int len;
+
+	cxgbi_sock_get(csk);
+	len = sprintf(buf, "%hu\n", ntohs(csk->daddr.sin_port));
+	cxgbi_sock_put(csk);
+
+	return len;
+}
+
+static inline int csk_print_ip(struct cxgbi_sock *csk, char *buf)
+{
+	int len;
+
+	cxgbi_sock_get(csk);
+	if (csk->csk_family == AF_INET)
+		len = sprintf(buf, "%pI4",
+			      &csk->daddr.sin_addr.s_addr);
+	else
+		len = sprintf(buf, "%pI6",
+			      &csk->daddr6.sin6_addr);
+
+	cxgbi_sock_put(csk);
+
+	return len;
+}
+
 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
 		       char *buf)
 {
@@ -2447,7 +2636,17 @@ struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
 		}
 	}
 
-	csk = cxgbi_check_route(dst_addr);
+	if (dst_addr->sa_family == AF_INET) {
+		csk = cxgbi_check_route(dst_addr);
+	} else if (dst_addr->sa_family == AF_INET6) {
+		csk = cxgbi_check_route6(dst_addr);
+	} else {
+		pr_info("address family 0x%x NOT supported.\n",
+			dst_addr->sa_family);
+		err = -EAFNOSUPPORT;
+		return (struct iscsi_endpoint *)ERR_PTR(err);
+	}
+
 	if (IS_ERR(csk))
 		return (struct iscsi_endpoint *)csk;
 	cxgbi_sock_get(csk);
diff --git a/drivers/scsi/cxgbi/libcxgbi.h b/drivers/scsi/cxgbi/libcxgbi.h
index 8135f04671af..8ad73d913f02 100644
--- a/drivers/scsi/cxgbi/libcxgbi.h
+++ b/drivers/scsi/cxgbi/libcxgbi.h
@@ -44,6 +44,15 @@ enum cxgbi_dbg_flag {
 			pr_info(fmt, ##__VA_ARGS__); \
 	} while (0)
 
+#define pr_info_ipaddr(fmt_trail,					\
+			addr1, addr2, args_trail...)			\
+do {									\
+	if (!((1 << CXGBI_DBG_SOCK) & dbg_level))			\
+		break;							\
+	pr_info("%pISpc - %pISpc, " fmt_trail,				\
+		addr1, addr2, args_trail);				\
+} while (0)
+
 /* max. connections per adapter */
 #define CXGBI_MAX_CONN		16384
 
@@ -202,8 +211,15 @@ struct cxgbi_sock {
 	spinlock_t lock;
 	struct kref refcnt;
 	unsigned int state;
-	struct sockaddr_in saddr;
-	struct sockaddr_in daddr;
+	unsigned int csk_family;
+	union {
+		struct sockaddr_in saddr;
+		struct sockaddr_in6 saddr6;
+	};
+	union {
+		struct sockaddr_in daddr;
+		struct sockaddr_in6 daddr6;
+	};
 	struct dst_entry *dst;
 	struct sk_buff_head receive_queue;
 	struct sk_buff_head write_queue;
@@ -692,6 +708,7 @@ struct cxgbi_device *cxgbi_device_register(unsigned int, unsigned int);
 void cxgbi_device_unregister(struct cxgbi_device *);
 void cxgbi_device_unregister_all(unsigned int flag);
 struct cxgbi_device *cxgbi_device_find_by_lldev(void *);
+struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *, int *);
 int cxgbi_hbas_add(struct cxgbi_device *, unsigned int, unsigned int,
 			struct scsi_host_template *,
 			struct scsi_transport_template *);