From patchwork Sun Mar 17 10:05:39 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wen Gu X-Patchwork-Id: 13594532 X-Patchwork-Delegate: kuba@kernel.org Received: from out30-113.freemail.mail.aliyun.com (out30-113.freemail.mail.aliyun.com [115.124.30.113]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4EAE318049; Sun, 17 Mar 2024 10:06:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.113 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710669966; cv=none; b=O553TS4BPJG4qne0DJkkU3t2Lf/VS+vibj7vkzc0xN7jFh7CcBVSBvInqnFqpIQgobECDtdCct9ZQAAfPbWrmHxqUd/U4CCb9U3R98jZjWRU8L1AHux1ecSSl97viauPXEBwjwzwMJ4tylHb6/2k9cxAUlsXLwXd+4cxP2WTyIM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710669966; c=relaxed/simple; bh=d/f+rqWWrCiPLTlsK6uCCqAGcWyrx4HXB+EIx9nXQ9Q=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=HaVfP4jiRLWTYRz5OBYNyeL3m71y/6be8GXVgUieIRQ/Y+cOuOQh6IL+h7LWUCfs3mxNqNshxqRnMSU4ef9F98aXHfHHmOGpHEJ01tE+ctKauj4xFtmhpcmYeyKvEOlqMJ4pJVgJTJHE3m1b0JtEtuh+7h5S4lSHuXcForBoD3c= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=dFLDcg55; arc=none smtp.client-ip=115.124.30.113 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="dFLDcg55" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1710669959; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=XXmNb7lQNGh1Pf1v4VwP/UCVKB/+4h+FT8aHZoBzRfQ=; b=dFLDcg55GMv3sDGujARuD1pJz0ClqCY8SEQbtipmC2ViLEd5iycEQHdUa8kj5qKRBAVbYPq+zn1ljv+OcqT1yZTtX0rf1LOqwjvHLav132WPpeDH76pO7N6MhBcoxuV/Fqz1YscuiiN9aGXdE2Vo+X3Gzm5Hrb+S2N2961U5xnw= X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R681e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018045168;MF=guwen@linux.alibaba.com;NM=1;PH=DS;RN=19;SR=0;TI=SMTPD_---0W2c852a_1710669957; Received: from localhost(mailfrom:guwen@linux.alibaba.com fp:SMTPD_---0W2c852a_1710669957) by smtp.aliyun-inc.com; Sun, 17 Mar 2024 18:05:58 +0800 From: Wen Gu To: wintera@linux.ibm.com, twinkler@linux.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, wenjia@linux.ibm.com, jaka@linux.ibm.com Cc: borntraeger@linux.ibm.com, svens@linux.ibm.com, alibuda@linux.alibaba.com, tonylu@linux.alibaba.com, guwen@linux.alibaba.com, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, netdev@vger.kernel.org Subject: [RFC PATCH net-next v4 05/11] net/smc: implement DMB-related operations of loopback-ism Date: Sun, 17 Mar 2024 18:05:39 +0800 Message-Id: <20240317100545.96663-6-guwen@linux.alibaba.com> X-Mailer: git-send-email 2.32.0.3.g01195cf9f In-Reply-To: <20240317100545.96663-1-guwen@linux.alibaba.com> References: <20240317100545.96663-1-guwen@linux.alibaba.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org X-Patchwork-State: RFC This implements DMB (un)registration and data move operations of loopback-ism device. Signed-off-by: Wen Gu --- net/smc/smc_loopback.c | 131 ++++++++++++++++++++++++++++++++++++++++- net/smc/smc_loopback.h | 13 ++++ 2 files changed, 141 insertions(+), 3 deletions(-) diff --git a/net/smc/smc_loopback.c b/net/smc/smc_loopback.c index 253128c77208..7335acb03920 100644 --- a/net/smc/smc_loopback.c +++ b/net/smc/smc_loopback.c @@ -15,11 +15,13 @@ #include #include +#include "smc_cdc.h" #include "smc_ism.h" #include "smc_loopback.h" #if IS_ENABLED(CONFIG_SMC_LO) #define SMC_LO_V2_CAPABLE 0x1 /* loopback-ism acts as ISMv2 */ +#define SMC_DMA_ADDR_INVALID (~(dma_addr_t)0) static const char smc_lo_dev_name[] = "loopback-ism"; static struct smc_lo_dev *lo_dev; @@ -49,6 +51,93 @@ static int smc_lo_query_rgid(struct smcd_dev *smcd, struct smcd_gid *rgid, return 0; } +static int smc_lo_register_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb, + void *client_priv) +{ + struct smc_lo_dmb_node *dmb_node, *tmp_node; + struct smc_lo_dev *ldev = smcd->priv; + int sba_idx, rc; + + /* check space for new dmb */ + for_each_clear_bit(sba_idx, ldev->sba_idx_mask, SMC_LO_MAX_DMBS) { + if (!test_and_set_bit(sba_idx, ldev->sba_idx_mask)) + break; + } + if (sba_idx == SMC_LO_MAX_DMBS) + return -ENOSPC; + + dmb_node = kzalloc(sizeof(*dmb_node), GFP_KERNEL); + if (!dmb_node) { + rc = -ENOMEM; + goto err_bit; + } + + dmb_node->sba_idx = sba_idx; + dmb_node->len = dmb->dmb_len; + dmb_node->cpu_addr = kzalloc(dmb_node->len, GFP_KERNEL | + __GFP_NOWARN | __GFP_NORETRY | + __GFP_NOMEMALLOC); + if (!dmb_node->cpu_addr) { + rc = -ENOMEM; + goto err_node; + } + dmb_node->dma_addr = SMC_DMA_ADDR_INVALID; + +again: + /* add new dmb into hash table */ + get_random_bytes(&dmb_node->token, sizeof(dmb_node->token)); + write_lock_bh(&ldev->dmb_ht_lock); + hash_for_each_possible(ldev->dmb_ht, tmp_node, list, dmb_node->token) { + if (tmp_node->token == dmb_node->token) { + write_unlock_bh(&ldev->dmb_ht_lock); + goto again; + } + } + hash_add(ldev->dmb_ht, &dmb_node->list, dmb_node->token); + write_unlock_bh(&ldev->dmb_ht_lock); + + dmb->sba_idx = dmb_node->sba_idx; + dmb->dmb_tok = dmb_node->token; + dmb->cpu_addr = dmb_node->cpu_addr; + dmb->dma_addr = dmb_node->dma_addr; + dmb->dmb_len = dmb_node->len; + + return 0; + +err_node: + kfree(dmb_node); +err_bit: + clear_bit(sba_idx, ldev->sba_idx_mask); + return rc; +} + +static int smc_lo_unregister_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb) +{ + struct smc_lo_dmb_node *dmb_node = NULL, *tmp_node; + struct smc_lo_dev *ldev = smcd->priv; + + /* remove dmb from hash table */ + write_lock_bh(&ldev->dmb_ht_lock); + hash_for_each_possible(ldev->dmb_ht, tmp_node, list, dmb->dmb_tok) { + if (tmp_node->token == dmb->dmb_tok) { + dmb_node = tmp_node; + break; + } + } + if (!dmb_node) { + write_unlock_bh(&ldev->dmb_ht_lock); + return -EINVAL; + } + hash_del(&dmb_node->list); + write_unlock_bh(&ldev->dmb_ht_lock); + + clear_bit(dmb_node->sba_idx, ldev->sba_idx_mask); + kfree(dmb_node->cpu_addr); + kfree(dmb_node); + + return 0; +} + static int smc_lo_add_vlan_id(struct smcd_dev *smcd, u64 vlan_id) { return -EOPNOTSUPP; @@ -75,6 +164,40 @@ static int smc_lo_signal_event(struct smcd_dev *dev, struct smcd_gid *rgid, return 0; } +static int smc_lo_move_data(struct smcd_dev *smcd, u64 dmb_tok, + unsigned int idx, bool sf, unsigned int offset, + void *data, unsigned int size) +{ + struct smc_lo_dmb_node *rmb_node = NULL, *tmp_node; + struct smc_lo_dev *ldev = smcd->priv; + + read_lock_bh(&ldev->dmb_ht_lock); + hash_for_each_possible(ldev->dmb_ht, tmp_node, list, dmb_tok) { + if (tmp_node->token == dmb_tok) { + rmb_node = tmp_node; + break; + } + } + if (!rmb_node) { + read_unlock_bh(&ldev->dmb_ht_lock); + return -EINVAL; + } + read_unlock_bh(&ldev->dmb_ht_lock); + + memcpy((char *)rmb_node->cpu_addr + offset, data, size); + + if (sf) { + struct smc_connection *conn = + smcd->conn[rmb_node->sba_idx]; + + if (conn && !conn->killed) + tasklet_schedule(&conn->rx_tsklet); + else + return -EPIPE; + } + return 0; +} + static int smc_lo_supports_v2(void) { return SMC_LO_V2_CAPABLE; @@ -101,14 +224,14 @@ static struct device *smc_lo_get_dev(struct smcd_dev *smcd) static const struct smcd_ops lo_ops = { .query_remote_gid = smc_lo_query_rgid, - .register_dmb = NULL, - .unregister_dmb = NULL, + .register_dmb = smc_lo_register_dmb, + .unregister_dmb = smc_lo_unregister_dmb, .add_vlan_id = smc_lo_add_vlan_id, .del_vlan_id = smc_lo_del_vlan_id, .set_vlan_required = smc_lo_set_vlan_required, .reset_vlan_required = smc_lo_reset_vlan_required, .signal_event = smc_lo_signal_event, - .move_data = NULL, + .move_data = smc_lo_move_data, .supports_v2 = smc_lo_supports_v2, .get_local_gid = smc_lo_get_local_gid, .get_chid = smc_lo_get_chid, @@ -173,6 +296,8 @@ static void smcd_lo_unregister_dev(struct smc_lo_dev *ldev) static int smc_lo_dev_init(struct smc_lo_dev *ldev) { smc_lo_generate_id(ldev); + rwlock_init(&ldev->dmb_ht_lock); + hash_init(ldev->dmb_ht); return smcd_lo_register_dev(ldev); } diff --git a/net/smc/smc_loopback.h b/net/smc/smc_loopback.h index 55b41133a97f..24ab9d747613 100644 --- a/net/smc/smc_loopback.h +++ b/net/smc/smc_loopback.h @@ -20,13 +20,26 @@ #if IS_ENABLED(CONFIG_SMC_LO) #define SMC_LO_MAX_DMBS 5000 +#define SMC_LO_DMBS_HASH_BITS 12 #define SMC_LO_CHID 0xFFFF +struct smc_lo_dmb_node { + struct hlist_node list; + u64 token; + u32 len; + u32 sba_idx; + void *cpu_addr; + dma_addr_t dma_addr; +}; + struct smc_lo_dev { struct smcd_dev *smcd; struct device dev; u16 chid; struct smcd_gid local_gid; + rwlock_t dmb_ht_lock; + DECLARE_BITMAP(sba_idx_mask, SMC_LO_MAX_DMBS); + DECLARE_HASHTABLE(dmb_ht, SMC_LO_DMBS_HASH_BITS); }; #endif