From mboxrd@z Thu Jan 1 00:00:00 1970 From: Haggai Eran Subject: [PATCH v2 04/11] IB/core: Find the network namespace matching connection parameters Date: Mon, 20 Apr 2015 12:03:35 +0300 Message-ID: <1429520622-10303-5-git-send-email-haggaie@mellanox.com> References: <1429520622-10303-1-git-send-email-haggaie@mellanox.com> Return-path: In-Reply-To: <1429520622-10303-1-git-send-email-haggaie-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Doug Ledford , Roland Dreier Cc: Sean Hefty , linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Liran Liss , Guy Shapiro , Shachar Raindel , Yotam Kenneth , Haggai Eran List-Id: linux-rdma@vger.kernel.org From: Yotam Kenneth In the case of IPoIB, and maybe in other cases, the network device is managed by an upper-layer protocol (ULP). In order to expose this network device to other users of the IB device, let ULPs implement a callback that returns network device according to connection parameters. The IB device and port, together with the P_Key and the IP address should be enough to uniquely identify the ULP net device. This function is passed to ib_core as part of the ib_client registration. Using this functionality, add a way to get the network namespace corresponding to a work completion. This is needed so that responses to CM requests can be sent from the same network namespace as the request. Signed-off-by: Haggai Eran Signed-off-by: Yotam Kenneth Signed-off-by: Shachar Raindel Signed-off-by: Guy Shapiro --- drivers/infiniband/core/device.c | 57 ++++++++++++++++++++++++++++++++++++++++ include/rdma/ib_verbs.h | 29 ++++++++++++++++++++ 2 files changed, 86 insertions(+) diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c index 18c1ece765f2..2f06be5b0b59 100644 --- a/drivers/infiniband/core/device.c +++ b/drivers/infiniband/core/device.c @@ -38,6 +38,7 @@ #include #include #include +#include #include #include "core_priv.h" @@ -733,6 +734,62 @@ int ib_find_pkey(struct ib_device *device, } EXPORT_SYMBOL(ib_find_pkey); +static struct net_device *ib_get_net_dev_by_port_pkey_ip(struct ib_device *dev, + u8 port, + u16 pkey, + struct sockaddr *addr) +{ + struct net_device *ret = NULL; + struct ib_client *client; + + mutex_lock(&device_mutex); + list_for_each_entry(client, &client_list, list) + if (client->get_net_device_by_port_pkey_ip) { + ret = client->get_net_device_by_port_pkey_ip(dev, port, + pkey, + addr); + if (ret) + break; + } + + mutex_unlock(&device_mutex); + return ret; +} + +struct net *ib_get_net_ns_by_port_pkey_ip(struct ib_device *dev, + u8 port, + u16 pkey, + struct sockaddr *addr) +{ + struct net_device *ndev = NULL; + struct net *ns; + + switch (rdma_port_get_link_layer(dev, port)) { + case IB_LINK_LAYER_INFINIBAND: + if (!addr) + goto not_found; + ndev = ib_get_net_dev_by_port_pkey_ip(dev, port, pkey, addr); + break; + default: + goto not_found; + } + + if (!ndev) + goto not_found; + + rcu_read_lock(); + ns = maybe_get_net(dev_net(ndev)); + dev_put(ndev); + rcu_read_unlock(); + if (!ns) + goto not_found; + return ns; + +not_found: + return get_net(&init_net); +} +EXPORT_SYMBOL(ib_get_net_ns_by_port_pkey_ip); + static int __init ib_core_init(void) { int ret; diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h index f4a85decc60f..74b239410562 100644 --- a/include/rdma/ib_verbs.h +++ b/include/rdma/ib_verbs.h @@ -1683,6 +1683,21 @@ struct ib_client { void (*add) (struct ib_device *); void (*remove)(struct ib_device *); + /* Returns the net_dev belonging to this ib_client and matching the + * given parameters. + * @dev: An RDMA device that the net_dev use for communication. + * @port: A physical port number on the RDMA device. + * @pkey: P_Key that the net_dev uses if applicable. + * @addr: An IP address the net_dev is configured with. + * + * An ib_client that implements a net_dev on top of RDMA devices + * (such as IP over IB) should implement this callback, allowing the + * rdma_cm module to find the right net_dev for a given request. */ + struct net_device *(*get_net_device_by_port_pkey_ip)( + struct ib_device *dev, + u8 port, + u16 pkey, + struct sockaddr *addr); struct list_head list; }; @@ -2679,4 +2694,18 @@ static inline int ib_check_mr_access(int flags) int ib_check_mr_status(struct ib_mr *mr, u32 check_mask, struct ib_mr_status *mr_status); +/** + * ib_get_net_ns_by_port_pkey_ip() - Return the appropriate net namespace + * for a received CM request + * @dev: An RDMA device on which the request has been received. + * @port: Port number on the RDMA device. + * @pkey: The Pkey the request came on. + * @addr: Contains the IP address that the request specified as its + * destination. + */ +struct net *ib_get_net_ns_by_port_pkey_ip(struct ib_device *dev, + u8 port, + u16 pkey, + struct sockaddr *addr); + #endif /* IB_VERBS_H */ -- 1.7.11.2 -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html