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From: Stephen Hemminger <stephen@networkplumber.org>
To: Gagandeep Singh <g.singh@nxp.com>
Cc: gakhil@marvell.com, dev@dpdk.org
Subject: Re: [PATCH v2 3/7] examples/l2fwd-crypto: add signal handler for exit
Date: Tue, 17 May 2022 09:32:12 -0700
Message-ID: <20220517093212.71b8019c@hermes.local> (raw)
In-Reply-To: <20220517033858.40394-4-g.singh@nxp.com>

On Tue, 17 May 2022 09:08:54 +0530
Gagandeep Singh <g.singh@nxp.com> wrote:

> Handle SIGINT and SIGTERM signals.
> 
> Signed-off-by: Gagandeep Singh <g.singh@nxp.com>
> ---
>  examples/l2fwd-crypto/main.c | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/examples/l2fwd-crypto/main.c b/examples/l2fwd-crypto/main.c
> index b1e2613ccf..0a1fc790fc 100644
> --- a/examples/l2fwd-crypto/main.c
> +++ b/examples/l2fwd-crypto/main.c
> @@ -18,6 +18,7 @@
>  #include <getopt.h>
>  #include <fcntl.h>
>  #include <unistd.h>
> +#include <signal.h>
>  
>  #include <rte_string_fns.h>
>  #include <rte_branch_prediction.h>
> @@ -256,6 +257,9 @@ struct l2fwd_crypto_statistics crypto_statistics[RTE_CRYPTO_MAX_DEVS];
>  #define MAX_TIMER_PERIOD 86400UL /* 1 day max */
>  #define DEFAULT_TIMER_PERIOD 10UL
>  
> +/* Global signal */
> +unsigned int signal_received;

This won't work as expected.

This kind of flag needs to either be volatile or use explicit atomic builtins
because the compiler and CPU are free to believe that it never changes.

Traditional way to address this would be:

static volatile bool signal_received;

More advanced way would be to use __atomic_load/store builtin.

Also printf() is not technically safe to call from a signal handler.


  reply	other threads:[~2022-05-17 16:32 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-25  4:14 [PATCH 1/8] app/test-crypto-perf: improve dequeue logic Gagandeep Singh
2022-04-25  4:14 ` [PATCH 2/8] app/test-crypto-perf: support SDAP for PDCP operations Gagandeep Singh
2022-05-13  9:49   ` [EXT] " Akhil Goyal
2022-04-25  4:14 ` [PATCH 3/8] examples/ipsec-secgw: support XCBC-MAC/DES-CBC Gagandeep Singh
2022-05-13  9:54   ` [EXT] " Akhil Goyal
2022-05-16  9:45     ` Gagandeep Singh
2022-04-25  4:14 ` [PATCH 4/8] examples/l2fwd-crypto: add signal handler for exit Gagandeep Singh
2022-04-25  4:14 ` [PATCH 5/8] test/crypto: fix pmd name for dpaa raw buffer crypto driver Gagandeep Singh
2022-04-25  4:14 ` [PATCH 6/8] test/crypto: support raw buffer APIs for PDCP Gagandeep Singh
2022-04-25  4:14 ` [PATCH 7/8] test/crypto: add external buffer test case Gagandeep Singh
2022-05-13 10:26   ` [EXT] " Akhil Goyal
2022-05-16  7:25     ` Gagandeep Singh
2022-04-25  4:14 ` [PATCH 8/8] test/crypto: add short MAC-I test vector for zuc Gagandeep Singh
2022-05-13 10:46   ` [EXT] " Akhil Goyal
2022-05-16  7:27     ` Gagandeep Singh
2022-05-13  9:46 ` [EXT] [PATCH 1/8] app/test-crypto-perf: improve dequeue logic Akhil Goyal
2022-05-16  7:14   ` Gagandeep Singh
2022-05-16  7:26     ` Anoob Joseph
2022-05-16  7:54       ` Gagandeep Singh
2022-05-17  3:38 ` [PATCH v2 0/7] Crypto related changes in sample/test apps Gagandeep Singh
2022-05-17  3:38   ` [PATCH v2 1/7] app/test-crypto-perf: support SDAP for PDCP operations Gagandeep Singh
2022-05-20  4:20     ` [PATCH v3 0/7] Crypto related changes in sample/test apps Gagandeep Singh
2022-05-20  4:20       ` [PATCH v3 1/7] app/test-crypto-perf: support SDAP for PDCP operations Gagandeep Singh
2022-05-26 13:52         ` [EXT] " Akhil Goyal
2022-05-30  4:31           ` Gagandeep Singh
2022-05-30  6:04             ` Akhil Goyal
2022-05-31 18:14               ` Akhil Goyal
2022-06-06  4:00         ` [PATCH v4] " Gagandeep Singh
2022-06-15 16:06           ` [EXT] " Akhil Goyal
2022-05-20  4:20       ` [PATCH v3 2/7] examples/ipsec-secgw: support XCBC-MAC/DES-CBC Gagandeep Singh
2022-05-26 13:54         ` [EXT] " Akhil Goyal
2022-05-20  4:21       ` [PATCH v3 3/7] examples/l2fwd-crypto: add signal handler for exit Gagandeep Singh
2022-05-26 13:55         ` [EXT] " Akhil Goyal
2022-05-20  4:21       ` [PATCH v3 4/7] test/crypto: fix PMD name for dpaa raw buffer crypto driver Gagandeep Singh
2022-05-26 13:56         ` [EXT] " Akhil Goyal
2022-05-20  4:21       ` [PATCH v3 5/7] test/crypto: support raw buffer APIs for PDCP Gagandeep Singh
2022-05-26 13:58         ` [EXT] " Akhil Goyal
2022-05-20  4:21       ` [PATCH v3 6/7] test/crypto: add short MAC-I test vector for zuc Gagandeep Singh
2022-05-26 13:59         ` [EXT] " Akhil Goyal
2022-05-20  4:21       ` [PATCH v3 7/7] doc: add missing authentication algorithm Gagandeep Singh
2022-05-26 14:00         ` [EXT] " Akhil Goyal
2022-05-17  3:38   ` [PATCH v2 2/7] examples/ipsec-secgw: support XCBC-MAC/DES-CBC Gagandeep Singh
2022-05-17  3:38   ` [PATCH v2 3/7] examples/l2fwd-crypto: add signal handler for exit Gagandeep Singh
2022-05-17 16:32     ` Stephen Hemminger [this message]
2022-05-18  4:23       ` Gagandeep Singh
2022-05-17  3:38   ` [PATCH v2 4/7] test/crypto: fix PMD name for dpaa raw buffer crypto driver Gagandeep Singh
2022-05-17  3:38   ` [PATCH v2 5/7] test/crypto: support raw buffer APIs for PDCP Gagandeep Singh
2022-05-17  3:38   ` [PATCH v2 6/7] test/crypto: add short MAC-I test vector for zuc Gagandeep Singh
2022-05-17  3:38   ` [PATCH v2 7/7] doc: add missing authentication algorithm Gagandeep Singh

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