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[ { "id": 115612, "web_url": "https://patches.dpdk.org/comment/115612/", "msgid": "<CAJFAV8zKAC3u7MKV3N7bswRK7Qo+sNNTv=jCXSAM=Ns1DB1EGw@mail.gmail.com>", "list_archive_url": "https://inbox.dpdk.org/dev/CAJFAV8zKAC3u7MKV3N7bswRK7Qo+sNNTv=jCXSAM=Ns1DB1EGw@mail.gmail.com", "date": "2020-07-09T11:49:53", "subject": "Re: [dpdk-dev] [PATCH v8 1/3] lib/lpm: integrate RCU QSBR", "submitter": { "id": 1173, "url": "https://patches.dpdk.org/api/people/1173/?format=api", "name": "David Marchand", "email": "david.marchand@redhat.com" }, "content": "Hello Ruifeng,\n\nOn Thu, Jul 9, 2020 at 10:03 AM Ruifeng Wang <ruifeng.wang@arm.com> wrote:\n> diff --git a/lib/librte_lpm/rte_lpm.c b/lib/librte_lpm/rte_lpm.c\n> index 38ab512a4..4fbf5b6df 100644\n> --- a/lib/librte_lpm/rte_lpm.c\n> +++ b/lib/librte_lpm/rte_lpm.c\n> @@ -1,5 +1,6 @@\n> /* SPDX-License-Identifier: BSD-3-Clause\n> * Copyright(c) 2010-2014 Intel Corporation\n> + * Copyright(c) 2020 Arm Limited\n> */\n>\n> #include <string.h>\n> @@ -39,6 +40,17 @@ enum valid_flag {\n> VALID\n> };\n>\n> +/** @internal LPM structure. */\n> +struct __rte_lpm {\n> + /* LPM metadata. */\n> + struct rte_lpm lpm;\n> +\n> + /* RCU config. */\n> + struct rte_rcu_qsbr *v; /* RCU QSBR variable. */\n> + enum rte_lpm_qsbr_mode rcu_mode;/* Blocking, defer queue. */\n> + struct rte_rcu_qsbr_dq *dq; /* RCU QSBR defer queue. */\n> +};\n> +\n> /* Macro to enable/disable run-time checks. */\n> #if defined(RTE_LIBRTE_LPM_DEBUG)\n> #include <rte_debug.h>\n> @@ -122,6 +134,7 @@ rte_lpm_create(const char *name, int socket_id,\n> const struct rte_lpm_config *config)\n> {\n> char mem_name[RTE_LPM_NAMESIZE];\n> + struct __rte_lpm *internal_lpm = NULL;\n\nNit: internal_lpm does not need to be initialised to NULL.\n\n\n> struct rte_lpm *lpm = NULL;\n> struct rte_tailq_entry *te;\n> uint32_t mem_size, rules_size, tbl8s_size;\n> @@ -140,12 +153,6 @@ rte_lpm_create(const char *name, int socket_id,\n>\n> snprintf(mem_name, sizeof(mem_name), \"LPM_%s\", name);\n>\n> - /* Determine the amount of memory to allocate. */\n> - mem_size = sizeof(*lpm);\n> - rules_size = sizeof(struct rte_lpm_rule) * config->max_rules;\n> - tbl8s_size = (sizeof(struct rte_lpm_tbl_entry) *\n> - RTE_LPM_TBL8_GROUP_NUM_ENTRIES * config->number_tbl8s);\n> -\n> rte_mcfg_tailq_write_lock();\n>\n> /* guarantee there's no existing */\n> @@ -161,6 +168,12 @@ rte_lpm_create(const char *name, int socket_id,\n> goto exit;\n> }\n>\n> + /* Determine the amount of memory to allocate. */\n> + mem_size = sizeof(*internal_lpm);\n> + rules_size = sizeof(struct rte_lpm_rule) * config->max_rules;\n> + tbl8s_size = (sizeof(struct rte_lpm_tbl_entry) *\n> + RTE_LPM_TBL8_GROUP_NUM_ENTRIES * config->number_tbl8s);\n> +\n> /* allocate tailq entry */\n> te = rte_zmalloc(\"LPM_TAILQ_ENTRY\", sizeof(*te), 0);\n> if (te == NULL) {\n> @@ -170,22 +183,23 @@ rte_lpm_create(const char *name, int socket_id,\n> }\n>\n> /* Allocate memory to store the LPM data structures. */\n> - lpm = rte_zmalloc_socket(mem_name, mem_size,\n> + internal_lpm = rte_zmalloc_socket(mem_name, mem_size,\n> RTE_CACHE_LINE_SIZE, socket_id);\n> - if (lpm == NULL) {\n> + if (internal_lpm == NULL) {\n> RTE_LOG(ERR, LPM, \"LPM memory allocation failed\\n\");\n> rte_free(te);\n> rte_errno = ENOMEM;\n> goto exit;\n> }\n>\n> + lpm = &internal_lpm->lpm;\n\nFrom this point...\n\n> lpm->rules_tbl = rte_zmalloc_socket(NULL,\n> (size_t)rules_size, RTE_CACHE_LINE_SIZE, socket_id);\n>\n> if (lpm->rules_tbl == NULL) {\n> RTE_LOG(ERR, LPM, \"LPM rules_tbl memory allocation failed\\n\");\n> - rte_free(lpm);\n> - lpm = NULL;\n> + rte_free(internal_lpm);\n> + internal_lpm = NULL;\n\n... lpm is set to &internal_lpm->lpm and will be returned by jumping\nto the exit label.\nSo freeing internal_lpm is necessary, but the lpm variable must be set\nto NULL too.\n\n\n> rte_free(te);\n> rte_errno = ENOMEM;\n> goto exit;\n> @@ -197,8 +211,8 @@ rte_lpm_create(const char *name, int socket_id,\n> if (lpm->tbl8 == NULL) {\n> RTE_LOG(ERR, LPM, \"LPM tbl8 memory allocation failed\\n\");\n> rte_free(lpm->rules_tbl);\n> - rte_free(lpm);\n> - lpm = NULL;\n> + rte_free(internal_lpm);\n> + internal_lpm = NULL;\n\nDitto.\n\n\n> rte_free(te);\n> rte_errno = ENOMEM;\n> goto exit;", "headers": { "Return-Path": "<dev-bounces@dpdk.org>", "X-Original-To": "patchwork@inbox.dpdk.org", "Delivered-To": "patchwork@inbox.dpdk.org", "Received": [ "from dpdk.org (dpdk.org [92.243.14.124])\n\tby inbox.dpdk.org (Postfix) with ESMTP id 0A2A6A0528;\n\tThu, 9 Jul 2020 13:50:09 +0200 (CEST)", "from [92.243.14.124] (localhost [127.0.0.1])\n\tby dpdk.org (Postfix) with ESMTP id CD9911E537;\n\tThu, 9 Jul 2020 13:50:08 +0200 (CEST)", "from us-smtp-1.mimecast.com (us-smtp-delivery-1.mimecast.com\n [207.211.31.120]) by dpdk.org (Postfix) with ESMTP id D6CDA1E535\n for <dev@dpdk.org>; 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charset=\"UTF-8\"", "Subject": "Re: [dpdk-dev] [PATCH v8 1/3] lib/lpm: integrate RCU QSBR", "X-BeenThere": "dev@dpdk.org", "X-Mailman-Version": "2.1.15", "Precedence": "list", "List-Id": "DPDK patches and discussions <dev.dpdk.org>", "List-Unsubscribe": "<https://mails.dpdk.org/options/dev>,\n <mailto:dev-request@dpdk.org?subject=unsubscribe>", "List-Archive": "<http://mails.dpdk.org/archives/dev/>", "List-Post": "<mailto:dev@dpdk.org>", "List-Help": "<mailto:dev-request@dpdk.org?subject=help>", "List-Subscribe": "<https://mails.dpdk.org/listinfo/dev>,\n <mailto:dev-request@dpdk.org?subject=subscribe>", "Errors-To": "dev-bounces@dpdk.org", "Sender": "\"dev\" <dev-bounces@dpdk.org>" }, "addressed": null }, { "id": 115639, "web_url": "https://patches.dpdk.org/comment/115639/", "msgid": "<HE1PR0801MB20258C7D93F08628DFFF7EEA9E640@HE1PR0801MB2025.eurprd08.prod.outlook.com>", "list_archive_url": "https://inbox.dpdk.org/dev/HE1PR0801MB20258C7D93F08628DFFF7EEA9E640@HE1PR0801MB2025.eurprd08.prod.outlook.com", "date": "2020-07-09T14:35:18", "subject": "Re: [dpdk-dev] [PATCH v8 1/3] lib/lpm: integrate RCU QSBR", "submitter": { "id": 1198, "url": "https://patches.dpdk.org/api/people/1198/?format=api", "name": "Ruifeng Wang", "email": "ruifeng.wang@arm.com" }, "content": "> -----Original Message-----\n> From: David Marchand <david.marchand@redhat.com>\n> Sent: Thursday, July 9, 2020 7:50 PM\n> To: Ruifeng Wang <Ruifeng.Wang@arm.com>\n> Cc: Bruce Richardson <bruce.richardson@intel.com>; Vladimir Medvedkin\n> <vladimir.medvedkin@intel.com>; John McNamara\n> <john.mcnamara@intel.com>; Marko Kovacevic\n> <marko.kovacevic@intel.com>; Ray Kinsella <mdr@ashroe.eu>; Neil Horman\n> <nhorman@tuxdriver.com>; dev <dev@dpdk.org>; Ananyev, Konstantin\n> <konstantin.ananyev@intel.com>; Honnappa Nagarahalli\n> <Honnappa.Nagarahalli@arm.com>; nd <nd@arm.com>\n> Subject: Re: [dpdk-dev] [PATCH v8 1/3] lib/lpm: integrate RCU QSBR\n> \n> Hello Ruifeng,\n> \nHi David,\n\nThanks for your review and suggestions.\n\n> On Thu, Jul 9, 2020 at 10:03 AM Ruifeng Wang <ruifeng.wang@arm.com>\n> wrote:\n> > diff --git a/lib/librte_lpm/rte_lpm.c b/lib/librte_lpm/rte_lpm.c index\n> > 38ab512a4..4fbf5b6df 100644\n> > --- a/lib/librte_lpm/rte_lpm.c\n> > +++ b/lib/librte_lpm/rte_lpm.c\n> > @@ -1,5 +1,6 @@\n> > /* SPDX-License-Identifier: BSD-3-Clause\n> > * Copyright(c) 2010-2014 Intel Corporation\n> > + * Copyright(c) 2020 Arm Limited\n> > */\n> >\n> > #include <string.h>\n> > @@ -39,6 +40,17 @@ enum valid_flag {\n> > VALID\n> > };\n> >\n> > +/** @internal LPM structure. */\n> > +struct __rte_lpm {\n> > + /* LPM metadata. */\n> > + struct rte_lpm lpm;\n> > +\n> > + /* RCU config. */\n> > + struct rte_rcu_qsbr *v; /* RCU QSBR variable. */\n> > + enum rte_lpm_qsbr_mode rcu_mode;/* Blocking, defer queue. */\n> > + struct rte_rcu_qsbr_dq *dq; /* RCU QSBR defer queue. */\n> > +};\n> > +\n> > /* Macro to enable/disable run-time checks. */ #if\n> > defined(RTE_LIBRTE_LPM_DEBUG) #include <rte_debug.h> @@ -122,6\n> +134,7\n> > @@ rte_lpm_create(const char *name, int socket_id,\n> > const struct rte_lpm_config *config) {\n> > char mem_name[RTE_LPM_NAMESIZE];\n> > + struct __rte_lpm *internal_lpm = NULL;\n> \n> Nit: internal_lpm does not need to be initialised to NULL.\n> \nAgreed.\n\n> \n> > struct rte_lpm *lpm = NULL;\n> > struct rte_tailq_entry *te;\n> > uint32_t mem_size, rules_size, tbl8s_size; @@ -140,12 +153,6\n> > @@ rte_lpm_create(const char *name, int socket_id,\n> >\n> > snprintf(mem_name, sizeof(mem_name), \"LPM_%s\", name);\n> >\n> > - /* Determine the amount of memory to allocate. */\n> > - mem_size = sizeof(*lpm);\n> > - rules_size = sizeof(struct rte_lpm_rule) * config->max_rules;\n> > - tbl8s_size = (sizeof(struct rte_lpm_tbl_entry) *\n> > - RTE_LPM_TBL8_GROUP_NUM_ENTRIES * config-\n> >number_tbl8s);\n> > -\n> > rte_mcfg_tailq_write_lock();\n> >\n> > /* guarantee there's no existing */ @@ -161,6 +168,12 @@\n> > rte_lpm_create(const char *name, int socket_id,\n> > goto exit;\n> > }\n> >\n> > + /* Determine the amount of memory to allocate. */\n> > + mem_size = sizeof(*internal_lpm);\n> > + rules_size = sizeof(struct rte_lpm_rule) * config->max_rules;\n> > + tbl8s_size = (sizeof(struct rte_lpm_tbl_entry) *\n> > + RTE_LPM_TBL8_GROUP_NUM_ENTRIES *\n> > + config->number_tbl8s);\n> > +\n> > /* allocate tailq entry */\n> > te = rte_zmalloc(\"LPM_TAILQ_ENTRY\", sizeof(*te), 0);\n> > if (te == NULL) {\n> > @@ -170,22 +183,23 @@ rte_lpm_create(const char *name, int socket_id,\n> > }\n> >\n> > /* Allocate memory to store the LPM data structures. */\n> > - lpm = rte_zmalloc_socket(mem_name, mem_size,\n> > + internal_lpm = rte_zmalloc_socket(mem_name, mem_size,\n> > RTE_CACHE_LINE_SIZE, socket_id);\n> > - if (lpm == NULL) {\n> > + if (internal_lpm == NULL) {\n> > RTE_LOG(ERR, LPM, \"LPM memory allocation failed\\n\");\n> > rte_free(te);\n> > rte_errno = ENOMEM;\n> > goto exit;\n> > }\n> >\n> > + lpm = &internal_lpm->lpm;\n> \n> From this point...\n> \n> > lpm->rules_tbl = rte_zmalloc_socket(NULL,\n> > (size_t)rules_size, RTE_CACHE_LINE_SIZE,\n> > socket_id);\n> >\n> > if (lpm->rules_tbl == NULL) {\n> > RTE_LOG(ERR, LPM, \"LPM rules_tbl memory allocation failed\\n\");\n> > - rte_free(lpm);\n> > - lpm = NULL;\n> > + rte_free(internal_lpm);\n> > + internal_lpm = NULL;\n> \n> ... lpm is set to &internal_lpm->lpm and will be returned by jumping to the\n> exit label.\n> So freeing internal_lpm is necessary, but the lpm variable must be set to\n> NULL too.\n> \nYes. lpm will be returned instead of internal_lpm. It must be set to NULL.\nWill add this in next version.\n\n> \n> > rte_free(te);\n> > rte_errno = ENOMEM;\n> > goto exit;\n> > @@ -197,8 +211,8 @@ rte_lpm_create(const char *name, int socket_id,\n> > if (lpm->tbl8 == NULL) {\n> > RTE_LOG(ERR, LPM, \"LPM tbl8 memory allocation failed\\n\");\n> > rte_free(lpm->rules_tbl);\n> > - rte_free(lpm);\n> > - lpm = NULL;\n> > + rte_free(internal_lpm);\n> > + internal_lpm = NULL;\n> \n> Ditto.\n> \nWill do.\nThanks.\n\n> \n> > rte_free(te);\n> > rte_errno = ENOMEM;\n> > goto exit;\n> \n> --\n> David Marchand", "headers": { "Return-Path": "<dev-bounces@dpdk.org>", "X-Original-To": "patchwork@inbox.dpdk.org", "Delivered-To": "patchwork@inbox.dpdk.org", "Received": [ "from dpdk.org (dpdk.org [92.243.14.124])\n\tby inbox.dpdk.org (Postfix) with ESMTP id 2F29BA0528;\n\tThu, 9 Jul 2020 16:36:33 +0200 (CEST)", "from [92.243.14.124] (localhost [127.0.0.1])\n\tby dpdk.org (Postfix) with ESMTP id 093611E8F4;\n\tThu, 9 Jul 2020 16:36:33 +0200 (CEST)", "from EUR01-HE1-obe.outbound.protection.outlook.com\n (mail-eopbgr130059.outbound.protection.outlook.com [40.107.13.59])\n by dpdk.org (Postfix) with ESMTP id C51B91E8BC\n for <dev@dpdk.org>; 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