From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 9EEF43BA224 for ; Wed, 4 Mar 2026 14:04:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772633092; cv=none; b=BbDTjhdEwaBMGnINzQ6DGKjKTVTSBV1LWw5D+6M+zmBXmUpHhHkPiNY+DFJfnCyLMDu7+BVSoKrNsLV1xC+vPK4js78Id9vlBPQn7VQsULxHg23EwcbOZmZO7vFaDgl4w7eQnFtxBGfjWqpDMs071ofVhqjOHqXd2nB/RJVyUaY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772633092; c=relaxed/simple; bh=VcOZjsJ4CdphSKdTgenpkdwStJn6CCz7omsomjQqS3Y=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:content-type; b=uL2dSMa1BC9FvMnbO925YOaB/xuICxdwIjsMD7ch2xXoJlJzktV19jeYqFuQlXnZFTwFtP4JUXBRQc2ES+bCEKvoyvcy4Yz5FX4G3KAbMKEY9qNIcUqrWCLIJ3XbkKQ2kF0PpguBuTAUINGIPjeOvrSt/HLlab/4wz9pqAgaH+U= 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=Rw2bZZ1T; arc=none smtp.client-ip=170.10.133.124 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="Rw2bZZ1T" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1772633090; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=gmalM6e/KranB4NTwyzjDkasLFtiotle3DJG5ULgat8=; b=Rw2bZZ1TKfV2SjH4czwgvXlKf0mEzMPAhEoYF4HAZ0jzVC+Pwj2kCyf8074IloXzMeYXlE mIu6I99UM2NOXlV8LkXOrRQ+jksx7R0gAiI1AiQuSzbRRTm2jhUtrH5g1J0Wegw0kQq615 HxB/RYQ+d0QfV57yfAEGvHdQlFASxp4= Received: from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-662-JTv7Sk2YOCuKy6jgSHs42Q-1; Wed, 04 Mar 2026 09:04:45 -0500 X-MC-Unique: JTv7Sk2YOCuKy6jgSHs42Q-1 X-Mimecast-MFC-AGG-ID: JTv7Sk2YOCuKy6jgSHs42Q_1772633082 Received: from mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.12]) (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-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 0BF9418002F0; Wed, 4 Mar 2026 14:04:42 +0000 (UTC) Received: from warthog.procyon.org.com (unknown [10.44.32.194]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id AE60B1958DC5; Wed, 4 Mar 2026 14:04:36 +0000 (UTC) From: David Howells To: Matthew Wilcox , Christoph Hellwig , Jens Axboe , Leon Romanovsky Cc: David Howells , Christian Brauner , Paulo Alcantara , 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, Paulo Alcantara , Steve French , Shyam Prasad N , Tom Talpey Subject: [RFC PATCH 09/17] cifs: Support ITER_BVECQ in smb_extract_iter_to_rdma() Date: Wed, 4 Mar 2026 14:03:16 +0000 Message-ID: <20260304140328.112636-10-dhowells@redhat.com> In-Reply-To: <20260304140328.112636-1-dhowells@redhat.com> References: <20260304140328.112636-1-dhowells@redhat.com> Precedence: bulk X-Mailing-List: netfs@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 X-Mimecast-MFC-PROC-ID: X4xaw99RtNs6ULwTTwHx7YcriDg94rbXpC66sXzzgz4_1772633082 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true Add support for ITER_BVECQ to smb_extract_iter_to_rdma(). Signed-off-by: David Howells 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/client/smbdirect.c | 60 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) diff --git a/fs/smb/client/smbdirect.c b/fs/smb/client/smbdirect.c index c79304012b08..0c6262010cd2 100644 --- a/fs/smb/client/smbdirect.c +++ b/fs/smb/client/smbdirect.c @@ -3298,6 +3298,63 @@ static ssize_t smb_extract_folioq_to_rdma(struct iov_iter *iter, return ret; } +/* + * Extract memory fragments from a BVECQ-class iterator and add them to an RDMA + * list. The folios are not pinned. + */ +static ssize_t smb_extract_bvecq_to_rdma(struct iov_iter *iter, + struct smb_extract_to_rdma *rdma, + ssize_t maxsize) +{ + const struct bvecq *bq = iter->bvecq; + unsigned int slot = iter->bvecq_slot; + ssize_t ret = 0; + size_t offset = iter->iov_offset; + + if (slot >= bq->nr_segs) { + bq = bq->next; + if (WARN_ON_ONCE(!bq)) + return -EIO; + slot = 0; + } + + do { + struct bio_vec *bv = &bq->bv[slot]; + struct page *page = bv->bv_page; + size_t bsize = bv->bv_len; + + if (offset < bsize) { + size_t part = umin(maxsize, bsize - offset); + + if (!smb_set_sge(rdma, page, bv->bv_offset + offset, part)) + return -EIO; + + offset += part; + ret += part; + maxsize -= part; + } + + if (offset >= bsize) { + offset = 0; + slot++; + if (slot >= bq->nr_segs) { + if (!bq->next) { + WARN_ON_ONCE(ret < iter->count); + break; + } + bq = bq->next; + slot = 0; + } + } + } while (rdma->nr_sge < rdma->max_sge && maxsize > 0); + + iter->bvecq = bq; + iter->bvecq_slot = slot; + iter->iov_offset = offset; + iter->count -= ret; + return ret; +} + /* * Extract page fragments from up to the given amount of the source iterator * and build up an RDMA list that refers to all of those bits. The RDMA list @@ -3325,6 +3382,9 @@ static ssize_t smb_extract_iter_to_rdma(struct iov_iter *iter, size_t len, case ITER_FOLIOQ: ret = smb_extract_folioq_to_rdma(iter, rdma, len); break; + case ITER_BVECQ: + ret = smb_extract_bvecq_to_rdma(iter, rdma, len); + break; default: WARN_ON_ONCE(1); return -EIO;