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RDMA/cma: Increment port number after close to avoid re-use 

Randomize the starting port number and avoid re-using port values
immediately after they are closed.  Instead keep track of the last
port value used and increment it every time a new port number is
assigned, to better replicate other port spaces.

Signed-off-by: Roland Dreier <rolandd@cisco.com>
hifive-unleashed-5.1
Sean Hefty 2007-01-29 16:41:23 -08:00 committed by Roland Dreier
parent 65e5c02621
commit aedec08050
1 changed files with 57 additions and 11 deletions
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68
drivers/infiniband/core/cma.c
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@ -71,6 +71,7 @@ static struct workqueue_struct *cma_wq;
static DEFINE_IDR(sdp_ps);
static DEFINE_IDR(tcp_ps);
static DEFINE_IDR(udp_ps);
static int next_port;
struct cma_device {
struct list_head list;
@ -1722,33 +1723,74 @@ static int cma_alloc_port(struct idr *ps, struct rdma_id_private *id_priv,
unsigned short snum)
{
struct rdma_bind_list *bind_list;
int port, start, ret;
int port, ret;
bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
if (!bind_list)
return -ENOMEM;
start = snum ? snum : sysctl_local_port_range[0];
do {
ret = idr_get_new_above(ps, bind_list, start, &port);
ret = idr_get_new_above(ps, bind_list, snum, &port);
} while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL));
if (ret)
goto err;
goto err1;
if ((snum && port != snum) ||
(!snum && port > sysctl_local_port_range[1])) {
idr_remove(ps, port);
if (port != snum) {
ret = -EADDRNOTAVAIL;
goto err;
goto err2;
}
bind_list->ps = ps;
bind_list->port = (unsigned short) port;
cma_bind_port(bind_list, id_priv);
return 0;
err:
err2:
idr_remove(ps, port);
err1:
kfree(bind_list);
return ret;
}
static int cma_alloc_any_port(struct idr *ps, struct rdma_id_private *id_priv)
{
struct rdma_bind_list *bind_list;
int port, ret;
bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
if (!bind_list)
return -ENOMEM;
retry:
do {
ret = idr_get_new_above(ps, bind_list, next_port, &port);
} while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL));
if (ret)
goto err1;
if (port > sysctl_local_port_range[1]) {
if (next_port != sysctl_local_port_range[0]) {
idr_remove(ps, port);
next_port = sysctl_local_port_range[0];
goto retry;
}
ret = -EADDRNOTAVAIL;
goto err2;
}
if (port == sysctl_local_port_range[1])
next_port = sysctl_local_port_range[0];
else
next_port = port + 1;
bind_list->ps = ps;
bind_list->port = (unsigned short) port;
cma_bind_port(bind_list, id_priv);
return 0;
err2:
idr_remove(ps, port);
err1:
kfree(bind_list);
return ret;
}
@ -1811,7 +1853,7 @@ 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))
ret = cma_alloc_port(ps, id_priv, 0);
ret = cma_alloc_any_port(ps, id_priv);
else
ret = cma_use_port(ps, id_priv);
mutex_unlock(&lock);
@ -2448,6 +2490,10 @@ static int cma_init(void)
{
int ret;
get_random_bytes(&next_port, sizeof next_port);
next_port = (next_port % (sysctl_local_port_range[1] -
sysctl_local_port_range[0])) +
sysctl_local_port_range[0];
cma_wq = create_singlethread_workqueue("rdma_cm_wq");
if (!cma_wq)
return -ENOMEM;