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RDMA/cma: Remove padding arrays by using struct sockaddr_storage
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There are a few places where the RDMA CM code handles IPv6 by doing

	struct sockaddr		addr;
	u8			pad[sizeof(struct sockaddr_in6) -
				    sizeof(struct sockaddr)];

This is fragile and ugly; handle this in a better way with just

	struct sockaddr_storage	addr;

[ Also roll in patch from Aleksey Senin <alekseys@voltaire.com> to
  switch to struct sockaddr_storage and get rid of padding arrays in
  struct rdma_addr. ]

Signed-off-by: Roland Dreier <rolandd@cisco.com>
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Roland Dreier committed Aug 4, 2008
1 parent 6e86841 commit 3f44675
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Showing 3 changed files with 26 additions and 33 deletions.
37 changes: 18 additions & 19 deletions drivers/infiniband/core/cma.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -155,9 +155,7 @@ struct cma_multicast {
} multicast;
struct list_head list;
void *context;
struct sockaddr addr;
u8 pad[sizeof(struct sockaddr_in6) -
sizeof(struct sockaddr)];
struct sockaddr_storage addr;
};

struct cma_work {
Expand Down Expand Up @@ -786,8 +784,8 @@ static void cma_cancel_operation(struct rdma_id_private *id_priv,
cma_cancel_route(id_priv);
break;
case CMA_LISTEN:
if (cma_any_addr(&id_priv->id.route.addr.src_addr) &&
!id_priv->cma_dev)
if (cma_any_addr((struct sockaddr *) &id_priv->id.route.addr.src_addr)
&& !id_priv->cma_dev)
cma_cancel_listens(id_priv);
break;
default:
Expand Down Expand Up @@ -1026,7 +1024,7 @@ static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;

ib_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
ret = rdma_translate_ip(&id->route.addr.src_addr,
ret = rdma_translate_ip((struct sockaddr *) &id->route.addr.src_addr,
&id->route.addr.dev_addr);
if (ret)
goto destroy_id;
Expand Down Expand Up @@ -1064,7 +1062,7 @@ static struct rdma_id_private *cma_new_udp_id(struct rdma_cm_id *listen_id,
cma_save_net_info(&id->route.addr, &listen_id->route.addr,
ip_ver, port, src, dst);

ret = rdma_translate_ip(&id->route.addr.src_addr,
ret = rdma_translate_ip((struct sockaddr *) &id->route.addr.src_addr,
&id->route.addr.dev_addr);
if (ret)
goto err;
Expand Down Expand Up @@ -1377,7 +1375,7 @@ static int cma_ib_listen(struct rdma_id_private *id_priv)
if (IS_ERR(id_priv->cm_id.ib))
return PTR_ERR(id_priv->cm_id.ib);

addr = &id_priv->id.route.addr.src_addr;
addr = (struct sockaddr *) &id_priv->id.route.addr.src_addr;
svc_id = cma_get_service_id(id_priv->id.ps, addr);
if (cma_any_addr(addr))
ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, NULL);
Expand Down Expand Up @@ -1443,7 +1441,7 @@ static void cma_listen_on_dev(struct rdma_id_private *id_priv,

dev_id_priv->state = CMA_ADDR_BOUND;
memcpy(&id->route.addr.src_addr, &id_priv->id.route.addr.src_addr,
ip_addr_size(&id_priv->id.route.addr.src_addr));
ip_addr_size((struct sockaddr *) &id_priv->id.route.addr.src_addr));

cma_attach_to_dev(dev_id_priv, cma_dev);
list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
Expand Down Expand Up @@ -1563,13 +1561,14 @@ static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms,
path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(&addr->dev_addr));
path_rec.numb_path = 1;
path_rec.reversible = 1;
path_rec.service_id = cma_get_service_id(id_priv->id.ps, &addr->dst_addr);
path_rec.service_id = cma_get_service_id(id_priv->id.ps,
(struct sockaddr *) &addr->dst_addr);

comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;

if (addr->src_addr.sa_family == AF_INET) {
if (addr->src_addr.ss_family == AF_INET) {
path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
} else {
Expand Down Expand Up @@ -1848,7 +1847,7 @@ static int cma_resolve_loopback(struct rdma_id_private *id_priv)
ib_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
ib_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);

if (cma_zero_addr(&id_priv->id.route.addr.src_addr)) {
if (cma_zero_addr((struct sockaddr *) &id_priv->id.route.addr.src_addr)) {
src_in = (struct sockaddr_in *)&id_priv->id.route.addr.src_addr;
dst_in = (struct sockaddr_in *)&id_priv->id.route.addr.dst_addr;
src_in->sin_family = dst_in->sin_family;
Expand Down Expand Up @@ -1897,7 +1896,7 @@ int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
if (cma_any_addr(dst_addr))
ret = cma_resolve_loopback(id_priv);
else
ret = rdma_resolve_ip(&addr_client, &id->route.addr.src_addr,
ret = rdma_resolve_ip(&addr_client, (struct sockaddr *) &id->route.addr.src_addr,
dst_addr, &id->route.addr.dev_addr,
timeout_ms, addr_handler, id_priv);
if (ret)
Expand Down Expand Up @@ -2021,11 +2020,11 @@ static int cma_use_port(struct idr *ps, struct rdma_id_private *id_priv)
* We don't support binding to any address if anyone is bound to
* a specific address on the same port.
*/
if (cma_any_addr(&id_priv->id.route.addr.src_addr))
if (cma_any_addr((struct sockaddr *) &id_priv->id.route.addr.src_addr))
return -EADDRNOTAVAIL;

hlist_for_each_entry(cur_id, node, &bind_list->owners, node) {
if (cma_any_addr(&cur_id->id.route.addr.src_addr))
if (cma_any_addr((struct sockaddr *) &cur_id->id.route.addr.src_addr))
return -EADDRNOTAVAIL;

cur_sin = (struct sockaddr_in *) &cur_id->id.route.addr.src_addr;
Expand Down Expand Up @@ -2060,7 +2059,7 @@ static int cma_get_port(struct rdma_id_private *id_priv)
}

mutex_lock(&lock);
if (cma_any_port(&id_priv->id.route.addr.src_addr))
if (cma_any_port((struct sockaddr *) &id_priv->id.route.addr.src_addr))
ret = cma_alloc_any_port(ps, id_priv);
else
ret = cma_use_port(ps, id_priv);
Expand Down Expand Up @@ -2232,7 +2231,7 @@ static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,

req.path = route->path_rec;
req.service_id = cma_get_service_id(id_priv->id.ps,
&route->addr.dst_addr);
(struct sockaddr *) &route->addr.dst_addr);
req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
req.max_cm_retries = CMA_MAX_CM_RETRIES;

Expand Down Expand Up @@ -2283,7 +2282,7 @@ static int cma_connect_ib(struct rdma_id_private *id_priv,
req.alternate_path = &route->path_rec[1];

req.service_id = cma_get_service_id(id_priv->id.ps,
&route->addr.dst_addr);
(struct sockaddr *) &route->addr.dst_addr);
req.qp_num = id_priv->qp_num;
req.qp_type = IB_QPT_RC;
req.starting_psn = id_priv->seq_num;
Expand Down Expand Up @@ -2667,7 +2666,7 @@ static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
if (ret)
return ret;

cma_set_mgid(id_priv, &mc->addr, &rec.mgid);
cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid);
if (id_priv->id.ps == RDMA_PS_UDP)
rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
ib_addr_get_sgid(dev_addr, &rec.port_gid);
Expand Down
14 changes: 6 additions & 8 deletions drivers/infiniband/core/ucma.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -81,9 +81,7 @@ struct ucma_multicast {

u64 uid;
struct list_head list;
struct sockaddr addr;
u8 pad[sizeof(struct sockaddr_in6) -
sizeof(struct sockaddr)];
struct sockaddr_storage addr;
};

struct ucma_event {
Expand Down Expand Up @@ -603,11 +601,11 @@ static ssize_t ucma_query_route(struct ucma_file *file,
return PTR_ERR(ctx);

memset(&resp, 0, sizeof resp);
addr = &ctx->cm_id->route.addr.src_addr;
addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr;
memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ?
sizeof(struct sockaddr_in) :
sizeof(struct sockaddr_in6));
addr = &ctx->cm_id->route.addr.dst_addr;
addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr;
memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ?
sizeof(struct sockaddr_in) :
sizeof(struct sockaddr_in6));
Expand Down Expand Up @@ -913,7 +911,7 @@ static ssize_t ucma_join_multicast(struct ucma_file *file,

mc->uid = cmd.uid;
memcpy(&mc->addr, &cmd.addr, sizeof cmd.addr);
ret = rdma_join_multicast(ctx->cm_id, &mc->addr, mc);
ret = rdma_join_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr, mc);
if (ret)
goto err2;

Expand All @@ -929,7 +927,7 @@ static ssize_t ucma_join_multicast(struct ucma_file *file,
return 0;

err3:
rdma_leave_multicast(ctx->cm_id, &mc->addr);
rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr);
ucma_cleanup_mc_events(mc);
err2:
mutex_lock(&mut);
Expand Down Expand Up @@ -975,7 +973,7 @@ static ssize_t ucma_leave_multicast(struct ucma_file *file,
goto out;
}

rdma_leave_multicast(mc->ctx->cm_id, &mc->addr);
rdma_leave_multicast(mc->ctx->cm_id, (struct sockaddr *) &mc->addr);
mutex_lock(&mc->ctx->file->mut);
ucma_cleanup_mc_events(mc);
list_del(&mc->list);
Expand Down
8 changes: 2 additions & 6 deletions include/rdma/rdma_cm.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -71,12 +71,8 @@ enum rdma_port_space {
};

struct rdma_addr {
struct sockaddr src_addr;
u8 src_pad[sizeof(struct sockaddr_in6) -
sizeof(struct sockaddr)];
struct sockaddr dst_addr;
u8 dst_pad[sizeof(struct sockaddr_in6) -
sizeof(struct sockaddr)];
struct sockaddr_storage src_addr;
struct sockaddr_storage dst_addr;
struct rdma_dev_addr dev_addr;
};

Expand Down

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