From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 323AC431491 for ; Mon, 6 Jul 2026 15:35:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783352145; cv=none; b=eYW6gjxKxajhFkXdjeTqQyZSyTZ/tZzwiO4X6cB/bUgcVLI839mAs6gDCgWs8kc7kZ4GqujXjXOmEW3C3vfUwWa9u7dHw5umUq1C6B8KuQAkP4lKsxMduMUT8Mqde+tlbpU/Zz81hB3YX3XWqbl/G5OulRITFyFfUeTVtB00MyE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783352145; c=relaxed/simple; bh=5ZGE+mho8ulJw6UH6KcBmvhNxbnh5+t8g4Xi+B7GKoE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=k1DVsqn4htWEApJafZxAkiKUVJGiEUi46dgkSeVx4zcKLiVwGhxJK8CxKQNh522uaBwqSqGROWpGtUWIo1/FAX7FvGCJ7nvZrzAGEcdsXEnresyeRBZ2ZGjVF4645J7kLW3qZWXIVmI7W7ETKyfU+b0PFJL/tTK/UsBYuA6Soa8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=L4Cwk3iX; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="L4Cwk3iX" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1783352143; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=TC7u1wJqNrRG8z8GLvvATlIZdgquMp2P+436mVi2G3I=; b=L4Cwk3iXoBwzrdiGNKtACtAmXKBYztRxoBB6ndKoxBf1lGpKODe4DV5riZrGSJjwkxrVnn OD/2rkyPkEdEBSfdxlpNOh7p7TzmBFnHFEJeIxR7siVVO1jLvthGFAc5jIhckPAOx3cLfT nC/4Y263Y8DWUFLhM6f16QoJvXictgo= Received: from mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-635-6SDMLAsWNw6VG3ZXQg48rA-1; Mon, 06 Jul 2026 11:35:39 -0400 X-MC-Unique: 6SDMLAsWNw6VG3ZXQg48rA-1 X-Mimecast-MFC-AGG-ID: 6SDMLAsWNw6VG3ZXQg48rA_1783352136 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id A1AED1956089; Mon, 6 Jul 2026 15:35:36 +0000 (UTC) Received: from warthog.procyon.org.com (unknown [10.44.33.159]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 249B03000B78; Mon, 6 Jul 2026 15:35:29 +0000 (UTC) From: David Howells To: Christian Brauner , Matthew Wilcox , Christoph Hellwig Cc: David Howells , Paulo Alcantara , Jens Axboe , Leon Romanovsky , Steve French , ChenXiaoSong , Marc Dionne , Stefan Metzmacher , Eric Van Hensbergen , Dominique Martinet , Ilya Dryomov , netfs@lists.linux.dev, linux-afs@lists.infradead.org, linux-cifs@vger.kernel.org, linux-nfs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs@lists.linux.dev, linux-erofs@lists.ozlabs.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Shyam Prasad N , Tom Talpey Subject: [PATCH v5 10/21] smbdirect: Support ITER_BVECQ in smbdirect_map_sges_from_iter() Date: Mon, 6 Jul 2026 16:33:56 +0100 Message-ID: <20260706153408.1231650-11-dhowells@redhat.com> In-Reply-To: <20260706153408.1231650-1-dhowells@redhat.com> References: <20260706153408.1231650-1-dhowells@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Add support for ITER_BVECQ to smbdirect_map_sges_from_iter(). Signed-off-by: David Howells Acked-by: Stefan Metzmacher cc: Paulo Alcantara cc: Matthew Wilcox cc: Christoph Hellwig cc: Steve French cc: Shyam Prasad N cc: Tom Talpey cc: linux-cifs@vger.kernel.org cc: netfs@lists.linux.dev cc: linux-fsdevel@vger.kernel.org --- fs/smb/smbdirect/connection.c | 66 +++++++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) diff --git a/fs/smb/smbdirect/connection.c b/fs/smb/smbdirect/connection.c index 8adf58097534..4d2a1700104e 100644 --- a/fs/smb/smbdirect/connection.c +++ b/fs/smb/smbdirect/connection.c @@ -5,6 +5,7 @@ */ #include "internal.h" +#include #include struct smbdirect_map_sges { @@ -2006,6 +2007,68 @@ static ssize_t smbdirect_map_sges_from_bvec(struct iov_iter *iter, return ret; } +/* + * Extract memory fragments from a BVECQ-class iterator and add them to an RDMA + * list. The fragments are not pinned. + */ +static ssize_t smbdirect_map_sges_from_bvecq(struct iov_iter *iter, + struct smbdirect_map_sges *state, + ssize_t maxsize) +{ + const struct bvecq *bq = iter->bvecq; + unsigned int slot = iter->bvecq_slot; + ssize_t extracted = 0; + size_t offset = iter->iov_offset; + + maxsize = umin(maxsize, iov_iter_count(iter)); + + do { + struct bio_vec *bv; + size_t bsize; + + while (slot >= bq->nr_slots) { + if (!bq->next) { + if (WARN_ON_ONCE(maxsize > 0)) + return -EIO; + goto out; + } + bq = bq->next; + slot = 0; + } + + bv = &bq->bv[slot]; + bsize = bv->bv_len; + + if (offset < bsize) { + size_t part = umin(maxsize, bsize - offset); + bool ok; + + ok = smbdirect_map_sges_single_page(state, + bv->bv_page, + bv->bv_offset + offset, + part); + if (!ok) + return -EIO; + + offset += part; + extracted += part; + maxsize -= part; + } + + if (offset >= bsize) { + offset = 0; + slot++; + } + } while (state->num_sge < state->max_sge && maxsize > 0); + +out: + iter->bvecq = bq; + iter->bvecq_slot = slot; + iter->iov_offset = offset; + iter->count -= extracted; + return extracted; +} + /* * Extract fragments from a KVEC-class iterator and add them to an ib_sge list. * This can deal with vmalloc'd buffers as well as kmalloc'd or static buffers. @@ -2155,6 +2218,9 @@ static ssize_t smbdirect_map_sges_from_iter(struct iov_iter *iter, size_t len, case ITER_BVEC: ret = smbdirect_map_sges_from_bvec(iter, state, len); break; + case ITER_BVECQ: + ret = smbdirect_map_sges_from_bvecq(iter, state, len); + break; case ITER_KVEC: ret = smbdirect_map_sges_from_kvec(iter, state, len); break;