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From: Tyler Retzlaff <roretzla@linux.microsoft.com>
To: dev@dpdk.org
Cc: "Bruce Richardson" <bruce.richardson@intel.com>,
	"Stephen Hemminger" <stephen@networkplumber.org>,
	"Thomas Monjalon" <thomas@monjalon.net>,
	"Morten Brørup" <mb@smartsharesystems.com>,
	"Tyler Retzlaff" <roretzla@linux.microsoft.com>
Subject: [PATCH 4/4] dispatcher: use alloca instead of vla multi dimensional
Date: Thu,  4 Apr 2024 10:15:13 -0700	[thread overview]
Message-ID: <1712250913-1977-5-git-send-email-roretzla@linux.microsoft.com> (raw)
In-Reply-To: <1712250913-1977-1-git-send-email-roretzla@linux.microsoft.com>

RFC sample illustrating conversion of multi-dimensional VLA to use
alloca().

Signed-off-by: Tyler Retzlaff <roretzla@linux.microsoft.com>
---
 lib/dispatcher/rte_dispatcher.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/dispatcher/rte_dispatcher.c b/lib/dispatcher/rte_dispatcher.c
index 7934917..f154c26 100644
--- a/lib/dispatcher/rte_dispatcher.c
+++ b/lib/dispatcher/rte_dispatcher.c
@@ -119,7 +119,7 @@ struct rte_dispatcher {
 	struct rte_event *events, uint16_t num_events)
 {
 	int i;
-	struct rte_event bursts[EVD_MAX_HANDLERS][num_events];
+	struct rte_event *bursts = alloca(sizeof(struct rte_event) * EVD_MAX_HANDLERS * num_events);
 	uint16_t burst_lens[EVD_MAX_HANDLERS] = { 0 };
 	uint16_t drop_count = 0;
 	uint16_t dispatch_count;
@@ -136,7 +136,7 @@ struct rte_dispatcher {
 			continue;
 		}
 
-		bursts[handler_idx][burst_lens[handler_idx]] = *event;
+		bursts[handler_idx * num_events + burst_lens[handler_idx]] = *event;
 		burst_lens[handler_idx]++;
 	}
 
@@ -152,7 +152,7 @@ struct rte_dispatcher {
 			continue;
 
 		handler->process_fun(dispatcher->event_dev_id, port->port_id,
-				     bursts[i], len, handler->process_data);
+				     &bursts[i * num_events], len, handler->process_data);
 
 		dispatched += len;
 
-- 
1.8.3.1


  parent reply	other threads:[~2024-04-04 17:15 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-11-07 19:32 RFC acceptable handling of VLAs across toolchains Tyler Retzlaff
2023-11-08  2:31 ` Stephen Hemminger
2023-11-08  3:25   ` Tyler Retzlaff
2023-11-08  8:19     ` Morten Brørup
2023-11-08 16:51 ` Stephen Hemminger
2023-11-08 17:48   ` Morten Brørup
2023-11-09 10:25     ` RFC: default burst sizes in rte_config Morten Brørup
2023-11-09 20:26   ` RFC acceptable handling of VLAs across toolchains Tyler Retzlaff
2024-03-21  0:12     ` Tyler Retzlaff
2024-04-04 17:15 ` [PATCH 0/4] RFC samples converting VLA to alloca Tyler Retzlaff
2024-04-04 17:15   ` [PATCH 1/4] latencystats: use alloca instead of vla trivial Tyler Retzlaff
2024-04-06 15:28     ` Morten Brørup
2024-04-07  9:36       ` Mattias Rönnblom
2024-04-07 17:00         ` Stephen Hemminger
2024-04-04 17:15   ` [PATCH 2/4] hash: " Tyler Retzlaff
2024-04-06 16:01     ` Morten Brørup
2024-04-04 17:15   ` [PATCH 3/4] vhost: use alloca instead of vla sizeof Tyler Retzlaff
2024-04-06 22:30     ` Morten Brørup
2024-04-04 17:15   ` Tyler Retzlaff [this message]
2024-04-06 15:49     ` [PATCH 4/4] dispatcher: use alloca instead of vla multi dimensional Morten Brørup
2024-04-07  9:31   ` [PATCH 0/4] RFC samples converting VLA to alloca Mattias Rönnblom
2024-04-07 11:07     ` Morten Brørup
2024-04-07 17:03       ` Stephen Hemminger
2024-04-08 15:27         ` Tyler Retzlaff
2024-04-08 15:53           ` Morten Brørup
2024-04-09  8:28             ` Konstantin Ananyev
2024-04-09 15:08               ` Tyler Retzlaff
2024-04-10  9:58                 ` Konstantin Ananyev
2024-04-10 17:03                   ` Tyler Retzlaff
2024-04-10  7:32             ` Mattias Rönnblom
2024-04-10  7:52               ` Morten Brørup
2024-04-10 17:04               ` Tyler Retzlaff
2024-04-10  7:27           ` Mattias Rönnblom
2024-04-10 17:10             ` Tyler Retzlaff

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