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 682B23BCD21 for ; Tue, 29 Sep 2026 08:00:23 +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=1790668825; cv=none; b=qJ2v9n4vjOXf46pW8Mg5Jy3q+hQDQSGex5mVnu9wSZBnFOXEEUDtAxSAN8gKjg9qWFpTyXSIXgjoqbVjGFBYJxJFK3txGXjEjOQiyZza9uWekeFDX9lZ6KLeAKet2DNuWfit7y91VeWNnzUyNJyyiU/8K0eu/qiZvzABiDuc3KI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790668825; c=relaxed/simple; bh=0nLPG5HXz7Xo1+MBMhfA45u5paiGKM8kGdpuWz8dExs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=oJH0GCaHB70WBFVoN8BctbcVFiIVhNk9lNdVoF2B+IZLoVrX1SuXv+V1JrY4wdWVSJbqqw/+EQ07WGNjyKloigD7p6YpM3NPVquqZncqmYf2nApDnYkdFMuo97ouWW26HHzwWVEnCQQZQGpUWZTKv99yxTfGU7fuMuBV+a8fASs= 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=V9Uo4JFx; 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="V9Uo4JFx" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1790668822; 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=xjdLFx7siNPDsTDeYhNPbuQOG9Ff9GarrMomfKXig4Q=; b=V9Uo4JFxyohzwKry3PKWm9g18fbCaGdm67Wg9JeAr8b4fDzGviS2mg7O4UXNkoMTfQcO7W +vCNoDXyJK51lpHRvzr56DAWD5JwtrGgfEB2cMvXQH1KEQe0wGunt4vSZVQp9nC0gtrtzQ JEGXMU3yrtIt1ZpV/jGkePI42D7nP+8= Received: from mx-prod-mc-01.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-209-agefBdXvN8-_wKqf8DjKBg-1; Tue, 29 Sep 2026 04:00:18 -0400 X-MC-Unique: agefBdXvN8-_wKqf8DjKBg-1 X-Mimecast-MFC-AGG-ID: agefBdXvN8-_wKqf8DjKBg_1790668816 Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.17]) (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-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id D95211944F10; Tue, 29 Sep 2026 08:00:15 +0000 (UTC) Received: from warthog.com (unknown [10.44.32.54]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 2BACE1956047; Tue, 29 Sep 2026 08:00:09 +0000 (UTC) From: David Howells To: Christian Brauner Cc: David Howells , Paulo Alcantara , Matthew Wilcox , Namjae Jeon , 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-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Shyam Prasad N , Tom Talpey , Christoph Hellwig Subject: [PATCH v12 06/10] smbdirect: Support ITER_BVECQ in smbdirect_map_sges_from_iter() Date: Tue, 29 Sep 2026 08:59:07 +0100 Message-ID: <20260929075913.2740968-7-dhowells@redhat.com> In-Reply-To: <20260929075913.2740968-1-dhowells@redhat.com> References: <20260929075913.2740968-1-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 3.0 on 10.30.177.17 Add support for ITER_BVECQ to smbdirect_map_sges_from_iter(). Signed-off-by: David Howells Acked-by: Stefan Metzmacher Reviewed-by: Paulo Alcantara cc: Matthew Wilcox cc: Namjae Jeon cc: Shyam Prasad N cc: Tom Talpey cc: Christoph Hellwig cc: linux-cifs@vger.kernel.org cc: netfs@lists.linux.dev cc: linux-fsdevel@vger.kernel.org --- fs/smb/smbdirect/connection.c | 67 +++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) diff --git a/fs/smb/smbdirect/connection.c b/fs/smb/smbdirect/connection.c index afd31fa12a36..7cf8e1f8556f 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 { @@ -2015,6 +2016,69 @@ 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, *next; + 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) { + next = bvecq_next(bq); + if (!next) { + if (WARN_ON_ONCE(maxsize > 0)) + return -EIO; + goto out; + } + 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. @@ -2164,6 +2228,9 @@ 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;