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 *);