RDMA/CMA: Implement rdma_resolve_ip retry enhancement.
If an application is calling rdma_resolve_ip() and a status of -ENODATA is
returned from addr_resolve_local/remote(), the timeout mechanism waits until
the application's timeout occurs before rechecking the address resolution
status; the application will wait until it's full timeout occurs. This case is
seen when the work thread call to process_req() is made before the arp packet
is processed.
This patch is in addition to Steve Wise's neigh_event_send patch to initiate
neighbour discovery sent on 9/12/2007.
Signed-off-by: Glenn Grundstrom <[EMAIL PROTECTED]>
---
drivers/infiniband/core/addr.c | 11 +++++++++--
1 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c
index c5c33d3..a953780 100644
--- a/drivers/infiniband/core/addr.c
+++ b/drivers/infiniband/core/addr.c
@@ -55,6 +55,7 @@ struct addr_req {
int status;
};
+#define MIN_ADDR_TIMEOUT_MS 500
static void process_req(struct work_struct *work);
static DEFINE_MUTEX(lock);
@@ -136,6 +137,7 @@ static void set_timeout(unsigned long ti
static void queue_req(struct addr_req *req)
{
struct addr_req *temp_req;
+ unsigned long req_timeout = msecs_to_jiffies(MIN_ADDR_TIMEOUT_MS) +
jiffies;
mutex_lock(&lock);
list_for_each_entry_reverse(temp_req, &req_list, list) {
@@ -145,8 +147,10 @@ static void queue_req(struct addr_req *r
list_add(&req->list, &temp_req->list);
- if (req_list.next == &req->list)
+ if (req_list.next == &req->list) {
+ req_timeout = min(req_timeout, req->timeout);
set_timeout(req->timeout);
+ }
mutex_unlock(&lock);
}
@@ -220,6 +224,7 @@ static void process_req(struct work_stru
struct addr_req *req, *temp_req;
struct sockaddr_in *src_in, *dst_in;
struct list_head done_list;
+ unsigned long req_timeout;
INIT_LIST_HEAD(&done_list);
@@ -238,9 +243,11 @@ static void process_req(struct work_stru
list_move_tail(&req->list, &done_list);
}
+ req_timeout = msecs_to_jiffies(MIN_ADDR_TIMEOUT_MS) + jiffies;
if (!list_empty(&req_list)) {
req = list_entry(req_list.next, struct addr_req, list);
- set_timeout(req->timeout);
+ req_timeout = min(req_timeout, req->timeout);
+ set_timeout(req_timeout);
}
mutex_unlock(&lock);
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