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Date: Sun, 01 Feb 2015 13:22:56 +0100
From: Yann Droneaud <ydroneaud@...eya.com>
To: Shachar Raindel <raindel@...lanox.com>
Cc: roland@...nel.org, sean.hefty@...el.com,
linux-rdma@...r.kernel.org, netdev@...r.kernel.org,
liranl@...lanox.com, Guy Shapiro <guysh@...lanox.com>,
Haggai Eran <haggaie@...lanox.com>,
Yotam Kenneth <yotamke@...lanox.com>
Subject: Re: [PATCH for-next 01/10] IB/addr: Pass network namespace as a
parameter
Hi,
Le dimanche 01 février 2015 à 13:28 +0200, Shachar Raindel a écrit :
> From: Guy Shapiro <guysh@...lanox.com>
>
> Add network namespace support to the ib_addr module. For that, all the address
> resolution and matching should be done using the appropriate namespace instead
> of init_net.
>
> This is achieved by:
>
> 1. Adding an explicit network namespace argument to exported function that
> require a namespace.
> 2. Saving the namespace in the rdma_addr_client structure.
> 3. Using it when calling networking functions.
>
> In order to preserve the behavior of calling modules, &init_net is
> passed as the parameter in calls from other modules. This is modified as
> namspace support is added on more levels.
typo: "namespace"
>
> Signed-off-by: Haggai Eran <haggaie@...lanox.com>
> Signed-off-by: Yotam Kenneth <yotamke@...lanox.com>
> Signed-off-by: Shachar Raindel <raindel@...lanox.com>
> Signed-off-by: Guy Shapiro <guysh@...lanox.com>
>
> ---
> drivers/infiniband/core/addr.c | 31 ++++++++++++----------
> drivers/infiniband/core/cma.c | 4 ++-
> drivers/infiniband/core/verbs.c | 14 +++++++---
> drivers/infiniband/hw/ocrdma/ocrdma_ah.c | 3 ++-
> include/rdma/ib_addr.h | 44 ++++++++++++++++++++++++++++----
> 5 files changed, 72 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c
> index f80da50d84a5..95beaef6b66d 100644
> --- a/drivers/infiniband/core/addr.c
> +++ b/drivers/infiniband/core/addr.c
> @@ -128,7 +128,7 @@ int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr,
> int ret = -EADDRNOTAVAIL;
>
> if (dev_addr->bound_dev_if) {
> - dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
> + dev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
> if (!dev)
> return -ENODEV;
> ret = rdma_copy_addr(dev_addr, dev, NULL);
> @@ -137,9 +137,10 @@ int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr,
> }
>
> switch (addr->sa_family) {
> - case AF_INET:
> - dev = ip_dev_find(&init_net,
> - ((struct sockaddr_in *) addr)->sin_addr.s_addr);
> + case AF_INET: {
> + struct sockaddr_in *addr_in = (struct sockaddr_in *)addr;
> +
> + dev = ip_dev_find(dev_addr->net, addr_in->sin_addr.s_addr);
I don't see the point of this change.
>
> if (!dev)
> return ret;
> @@ -149,12 +150,12 @@ int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr,
> *vlan_id = rdma_vlan_dev_vlan_id(dev);
> dev_put(dev);
> break;
> -
> + }
closing } here ?
> #if IS_ENABLED(CONFIG_IPV6)
> case AF_INET6:
> rcu_read_lock();
> - for_each_netdev_rcu(&init_net, dev) {
> - if (ipv6_chk_addr(&init_net,
> + for_each_netdev_rcu(dev_addr->net, dev) {
> + if (ipv6_chk_addr(dev_addr->net,
> &((struct sockaddr_in6 *) addr)->sin6_addr,
> dev, 1)) {
> ret = rdma_copy_addr(dev_addr, dev, NULL);
> @@ -236,7 +237,7 @@ static int addr4_resolve(struct sockaddr_in *src_in,
> fl4.daddr = dst_ip;
> fl4.saddr = src_ip;
> fl4.flowi4_oif = addr->bound_dev_if;
> - rt = ip_route_output_key(&init_net, &fl4);
> + rt = ip_route_output_key(addr->net, &fl4);
> if (IS_ERR(rt)) {
> ret = PTR_ERR(rt);
> goto out;
> @@ -278,12 +279,13 @@ static int addr6_resolve(struct sockaddr_in6 *src_in,
> fl6.saddr = src_in->sin6_addr;
> fl6.flowi6_oif = addr->bound_dev_if;
>
> - dst = ip6_route_output(&init_net, NULL, &fl6);
> + dst = ip6_route_output(addr->net, NULL, &fl6);
> if ((ret = dst->error))
> goto put;
>
> if (ipv6_addr_any(&fl6.saddr)) {
> - ret = ipv6_dev_get_saddr(&init_net, ip6_dst_idev(dst)->dev,
> + ret = ipv6_dev_get_saddr(addr->net,
> + ip6_dst_idev(dst)->dev,
> &fl6.daddr, 0, &fl6.saddr);
> if (ret)
> goto put;
> @@ -458,7 +460,7 @@ static void resolve_cb(int status, struct sockaddr *src_addr,
> }
>
> int rdma_addr_find_dmac_by_grh(union ib_gid *sgid, union ib_gid *dgid, u8 *dmac,
> - u16 *vlan_id)
> + u16 *vlan_id, struct net *net)
> {
> int ret = 0;
> struct rdma_dev_addr dev_addr;
> @@ -481,6 +483,7 @@ int rdma_addr_find_dmac_by_grh(union ib_gid *sgid, union ib_gid *dgid, u8 *dmac,
> return ret;
>
> memset(&dev_addr, 0, sizeof(dev_addr));
> + dev_addr.net = net;
Should be get_net() be used somewhere to grab a reference on the net
namespace ?
>
> ctx.addr = &dev_addr;
> init_completion(&ctx.comp);
> @@ -492,7 +495,7 @@ int rdma_addr_find_dmac_by_grh(union ib_gid *sgid, union ib_gid *dgid, u8 *dmac,
> wait_for_completion(&ctx.comp);
>
> memcpy(dmac, dev_addr.dst_dev_addr, ETH_ALEN);
> - dev = dev_get_by_index(&init_net, dev_addr.bound_dev_if);
> + dev = dev_get_by_index(net, dev_addr.bound_dev_if);
> if (!dev)
> return -ENODEV;
> if (vlan_id)
> @@ -502,7 +505,8 @@ int rdma_addr_find_dmac_by_grh(union ib_gid *sgid, union ib_gid *dgid, u8 *dmac,
> }
> EXPORT_SYMBOL(rdma_addr_find_dmac_by_grh);
>
> -int rdma_addr_find_smac_by_sgid(union ib_gid *sgid, u8 *smac, u16 *vlan_id)
> +int rdma_addr_find_smac_by_sgid(union ib_gid *sgid, u8 *smac, u16 *vlan_id,
> + struct net *net)
> {
> int ret = 0;
> struct rdma_dev_addr dev_addr;
> @@ -517,6 +521,7 @@ int rdma_addr_find_smac_by_sgid(union ib_gid *sgid, u8 *smac, u16 *vlan_id)
> if (ret)
> return ret;
> memset(&dev_addr, 0, sizeof(dev_addr));
> + dev_addr.net = net;
get_net() ?
> ret = rdma_translate_ip(&gid_addr._sockaddr, &dev_addr, vlan_id);
> if (ret)
> return ret;
> diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
> index 6e5e11ca7702..aeb2417ec928 100644
> --- a/drivers/infiniband/core/cma.c
> +++ b/drivers/infiniband/core/cma.c
> @@ -512,6 +512,7 @@ struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler,
> INIT_LIST_HEAD(&id_priv->listen_list);
> INIT_LIST_HEAD(&id_priv->mc_list);
> get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
> + id_priv->id.route.addr.dev_addr.net = &init_net;
>
> return &id_priv->id;
> }
> @@ -637,7 +638,8 @@ static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
> == RDMA_TRANSPORT_IB &&
> rdma_port_get_link_layer(id_priv->id.device, id_priv->id.port_num)
> == IB_LINK_LAYER_ETHERNET) {
> - ret = rdma_addr_find_smac_by_sgid(&sgid, qp_attr.smac, NULL);
> + ret = rdma_addr_find_smac_by_sgid(&sgid, qp_attr.smac, NULL,
> + &init_net);
>
> if (ret)
> goto out;
> diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
> index f93eb8da7b5a..ca5c4dd8a67a 100644
> --- a/drivers/infiniband/core/verbs.c
> +++ b/drivers/infiniband/core/verbs.c
> @@ -212,7 +212,9 @@ int ib_init_ah_from_wc(struct ib_device *device, u8 port_num, struct ib_wc *wc,
> ah_attr->vlan_id = wc->vlan_id;
> } else {
> ret = rdma_addr_find_dmac_by_grh(&grh->dgid, &grh->sgid,
> - ah_attr->dmac, &ah_attr->vlan_id);
> + ah_attr->dmac,
> + &ah_attr->vlan_id,
> + &init_net);
> if (ret)
> return ret;
> }
> @@ -882,11 +884,15 @@ int ib_resolve_eth_l2_attrs(struct ib_qp *qp,
> if (!(*qp_attr_mask & IB_QP_VID))
> qp_attr->vlan_id = rdma_get_vlan_id(&sgid);
> } else {
> - ret = rdma_addr_find_dmac_by_grh(&sgid, &qp_attr->ah_attr.grh.dgid,
> - qp_attr->ah_attr.dmac, &qp_attr->vlan_id);
> + ret = rdma_addr_find_dmac_by_grh(
> + &sgid,
> + &qp_attr->ah_attr.grh.dgid,
> + qp_attr->ah_attr.dmac, &qp_attr->vlan_id,
> + &init_net);
> if (ret)
> goto out;
> - ret = rdma_addr_find_smac_by_sgid(&sgid, qp_attr->smac, NULL);
> + ret = rdma_addr_find_smac_by_sgid(&sgid, qp_attr->smac,
> + NULL, &init_net);
> if (ret)
> goto out;
> }
> diff --git a/drivers/infiniband/hw/ocrdma/ocrdma_ah.c b/drivers/infiniband/hw/ocrdma/ocrdma_ah.c
> index f3cc8c9e65ae..debaac2b6ee8 100644
> --- a/drivers/infiniband/hw/ocrdma/ocrdma_ah.c
> +++ b/drivers/infiniband/hw/ocrdma/ocrdma_ah.c
> @@ -119,7 +119,8 @@ struct ib_ah *ocrdma_create_ah(struct ib_pd *ibpd, struct ib_ah_attr *attr)
>
> if (pd->uctx) {
> status = rdma_addr_find_dmac_by_grh(&sgid, &attr->grh.dgid,
> - attr->dmac, &attr->vlan_id);
> + attr->dmac, &attr->vlan_id,
> + &init_net);
> if (status) {
> pr_err("%s(): Failed to resolve dmac from gid."
> "status = %d\n", __func__, status);
> diff --git a/include/rdma/ib_addr.h b/include/rdma/ib_addr.h
> index ce55906b54a0..40ccf8b83755 100644
> --- a/include/rdma/ib_addr.h
> +++ b/include/rdma/ib_addr.h
> @@ -47,6 +47,7 @@
> #include <rdma/ib_verbs.h>
> #include <rdma/ib_pack.h>
> #include <net/ipv6.h>
> +#include <net/net_namespace.h>
>
> struct rdma_addr_client {
> atomic_t refcount;
> @@ -64,6 +65,16 @@ void rdma_addr_register_client(struct rdma_addr_client *client);
> */
> void rdma_addr_unregister_client(struct rdma_addr_client *client);
>
> +/**
> + * struct rdma_dev_addr - Contains resolved RDMA hardware addresses
> + * @src_dev_addr: Source MAC address.
> + * @dst_dev_addr: Destination MAC address.
> + * @broadcast: Broadcast address of the device.
> + * @dev_type: The interface hardware type of the device.
> + * @bound_dev_if: An optional device interface index.
> + * @transport: The transport type used.
> + * @net: Network namespace containing the bound_dev_if net_dev.
> + */
> struct rdma_dev_addr {
> unsigned char src_dev_addr[MAX_ADDR_LEN];
> unsigned char dst_dev_addr[MAX_ADDR_LEN];
> @@ -71,11 +82,14 @@ struct rdma_dev_addr {
> unsigned short dev_type;
> int bound_dev_if;
> enum rdma_transport_type transport;
> + struct net *net;
> };
>
> /**
> * rdma_translate_ip - Translate a local IP address to an RDMA hardware
> * address.
> + *
> + * The dev_addr->net field must be initialized.
> */
> int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr,
> u16 *vlan_id);
> @@ -90,7 +104,7 @@ int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr,
> * @dst_addr: The destination address to resolve.
> * @addr: A reference to a data location that will receive the resolved
> * addresses. The data location must remain valid until the callback has
> - * been invoked.
> + * been invoked. The net field of the addr struct must be valid.
> * @timeout_ms: Amount of time to wait for the address resolution to complete.
> * @callback: Call invoked once address resolution has completed, timed out,
> * or been canceled. A status of 0 indicates success.
> @@ -110,9 +124,29 @@ int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev,
>
> int rdma_addr_size(struct sockaddr *addr);
>
> -int rdma_addr_find_smac_by_sgid(union ib_gid *sgid, u8 *smac, u16 *vlan_id);
> -int rdma_addr_find_dmac_by_grh(union ib_gid *sgid, union ib_gid *dgid, u8 *smac,
> - u16 *vlan_id);
> +/** rdma_addr_find_smac_by_sgid() - Find the src MAC and VLAN ID for a src GID
> + * @sgid: Source GID to find the MAC and VLAN for.
> + * @smac: A buffer to contain the resulting MAC address.
> + * @vlan_id: Will contain the resulting VLAN ID.
> + * @net: Network namespace to use for the address resolution.
> + *
> + * It is the caller's responsibility to keep the network namespace alive until
> + * the function returns.
Why ?
> + */
> +int rdma_addr_find_smac_by_sgid(union ib_gid *sgid, u8 *smac, u16 *vlan_id,
> + struct net *net);
> +/** rdma_addr_find_dmac_by_grh() - Find the dst MAC and VLAN ID for a GID pair
> + * @sgid: Source GID to use for the search.
> + * @dgid: Destination GID to find the details for.
> + * @dmac: Contains the resulting destination MAC address.
> + * @vlan_id: Contains the resulting VLAN ID.
> + * @net: Network namespace to use for the address resolution.
> + *
> + * It is the caller's responsibility to keep the network namespace alive until
> + * the function returns.
Why ?
> + */
> +int rdma_addr_find_dmac_by_grh(union ib_gid *sgid, union ib_gid *dgid, u8 *dmac,
> + u16 *vlan_id, struct net *net);
>
> static inline u16 ib_addr_get_pkey(struct rdma_dev_addr *dev_addr)
> {
> @@ -182,7 +216,7 @@ static inline void iboe_addr_get_sgid(struct rdma_dev_addr *dev_addr,
> struct net_device *dev;
> struct in_device *ip4;
>
> - dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
> + dev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
> if (dev) {
> ip4 = (struct in_device *)dev->ip_ptr;
> if (ip4 && ip4->ifa_list && ip4->ifa_list->ifa_address)
I believe this patch lack proper reference counting in form of
get_net() / put_net(), but cannot say for sure.
Regards.
--
Yann Droneaud
OPTEYA
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