[PATCH net 2/3] net: tls: Cancel RX async resync request on rdc_delta overflow

[Tariq Toukan <tariqt@nvidia.com>]

From: Shahar Shitrit <shshitrit@nvidia.com>

When a netdev issues an RX async resync request, the TLS module
increments rcd_delta for each new record that arrives. This tracks
how far the current record is from the point where synchronization
was lost.

When rcd_delta reaches its threshold, it indicates that the device
response is either excessively delayed or unlikely to arrive at all
(at that point, tcp_sn may have wrapped around, so a match would no
longer be valid anyway).

Previous patch introduced tls_offload_rx_resync_async_request_cancel()
to explicitly cancel resync requests when a device response failure
is detected.

This patch adds a final safeguard: cancel the async resync request when
rcd_delta crosses its threshold, as reaching this point implies that
earlier cancellation did not occur.

Signed-off-by: Shahar Shitrit <shshitrit@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
---
 net/tls/tls_device.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/tls/tls_device.c b/net/tls/tls_device.c
index f672a62a9a52..56c14f1647a4 100644
--- a/net/tls/tls_device.c
+++ b/net/tls/tls_device.c
@@ -721,8 +721,11 @@ tls_device_rx_resync_async(struct tls_offload_resync_async *resync_async,
 		/* shouldn't get to wraparound:
 		 * too long in async stage, something bad happened
 		 */
-		if (WARN_ON_ONCE(resync_async->rcd_delta == USHRT_MAX))
+		if (WARN_ON_ONCE(resync_async->rcd_delta == USHRT_MAX)) {
+			/* cancel resync request */
+			atomic64_set(&resync_async->req, 0);
 			return false;
+		}
 
 		/* asynchronous stage: log all headers seq such that
 		 * req_seq <= seq <= end_seq, and wait for real resync request
-- 
2.31.1