nvmet-rdma: fix possible bogus dereference under heavy load

Currently we always repost the recv buffer before we send a response
capsule back to the host. Since ordering is not guaranteed for send
and recv completions, it is posible that we will receive a new request
from the host before we got a send completion for the response capsule.

Today, we pre-allocate 2x rsps the length of the queue, but in reality,
under heavy load there is nothing that is really preventing the gap to
expand until we exhaust all our rsps.

To fix this, if we don't have any pre-allocated rsps left, we dynamically
allocate a rsp and make sure to free it when we are done. If under memory
pressure we fail to allocate a rsp, we silently drop the command and
wait for the host to retry.

Reported-by: Steve Wise <swise@opengridcomputing.com>
Tested-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
[hch: dropped a superflous assignment]
Signed-off-by: Christoph Hellwig <hch@lst.de>

1 files changed, 25 insertions, 2 deletions

diff --git a/drivers/nvme/target/rdma.c b/drivers/nvme/target/rdma.c
index 3533e918ea37..bfc4da660bb4 100644
--- a/drivers/nvme/target/rdma.c
+++ b/drivers/nvme/target/rdma.c
@@ -66,6 +66,7 @@ struct nvmet_rdma_rsp {
 
         struct nvmet_req        req;
 
+        bool                    allocated;
         u8                      n_rdma;
         u32                     flags;
         u32                     invalidate_rkey;
@@ -174,11 +175,19 @@ nvmet_rdma_get_rsp(struct nvmet_rdma_queue *queue)
         unsigned long flags;
 
         spin_lock_irqsave(&queue->rsps_lock, flags);
-        rsp = list_first_entry(&queue->free_rsps,
+        rsp = list_first_entry_or_null(&queue->free_rsps,
                                 struct nvmet_rdma_rsp, free_list);
-        list_del(&rsp->free_list);
+        if (likely(rsp))
+                list_del(&rsp->free_list);
         spin_unlock_irqrestore(&queue->rsps_lock, flags);
 
+        if (unlikely(!rsp)) {
+                rsp = kmalloc(sizeof(*rsp), GFP_KERNEL);
+                if (unlikely(!rsp))
+                        return NULL;
+                rsp->allocated = true;
+        }
+
         return rsp;
 }
 
@@ -187,6 +196,11 @@ nvmet_rdma_put_rsp(struct nvmet_rdma_rsp *rsp)
 {
         unsigned long flags;
 
+        if (rsp->allocated) {
+                kfree(rsp);
+                return;
+        }
+
         spin_lock_irqsave(&rsp->queue->rsps_lock, flags);
         list_add_tail(&rsp->free_list, &rsp->queue->free_rsps);
         spin_unlock_irqrestore(&rsp->queue->rsps_lock, flags);
@@ -776,6 +790,15 @@ static void nvmet_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc)
 
         cmd->queue = queue;
         rsp = nvmet_rdma_get_rsp(queue);
+        if (unlikely(!rsp)) {
+                /*
+                 * we get here only under memory pressure,
+                 * silently drop and have the host retry
+                 * as we can't even fail it.
+                 */
+                nvmet_rdma_post_recv(queue->dev, cmd);
+                return;
+        }
         rsp->queue = queue;
         rsp->cmd = cmd;
         rsp->flags = 0;