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 66E814968FD for ; Mon, 8 Jun 2026 14:56:49 +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=1780930616; cv=none; b=fV0J0VJOtHIB2orvR08V+mpmYIWIpUxndUYZiEnhgPa4vIpYNFVZX3Z1bYZ1D4sY6zcnqxRlcTjNXD9Iw/8+EurOiOUlOfzG5m70H5sYq2MNl8LXhKUU6DGqGmX4fwKZiuHqfe6JIUm5Va/gYo9PbA455SQySc5oI4E7dDyi1ew= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780930616; c=relaxed/simple; bh=5ZGE+mho8ulJw6UH6KcBmvhNxbnh5+t8g4Xi+B7GKoE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=fKMqbMHW3HSegGNSULU8F0MNJsGA4fUQpdXt1l3DxWmRmSWbrLcNkevjcRBoz5iyFzelZ1ZSbzaUdrQFvGbVmTA3qn+jI8Grw8PhRNGY2BObT0MHKtUyeDpaZDw9nyQqOayq+mrLbaoNyET8DCcjUlExEXl/GLysQpGWENGLOd0= 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=en/dMSeQ; 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="en/dMSeQ" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1780930608; 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=en/dMSeQTQacGIRVO4TQwgMQpnmgSKk7doIpVJNcFzBzo3llaA5HbPNprb/ItzEH4yMJn3 eZiVuJUoNaXh8/aVPGjjYtsfeJvqZj+s5KC0nZTsq33kKsSSihEu+DIHPCM8sm485dv4b7 PqGadhf2MhEbLGJOkDnRKoJZP+7iV6U= Received: from mx-prod-mc-03.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-693-Jz66VAlWM4y8BoYmBV3flw-1; Mon, 08 Jun 2026 10:56:42 -0400 X-MC-Unique: Jz66VAlWM4y8BoYmBV3flw-1 X-Mimecast-MFC-AGG-ID: Jz66VAlWM4y8BoYmBV3flw_1780930598 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-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id DF0181956055; Mon, 8 Jun 2026 14:56:37 +0000 (UTC) Received: from warthog.procyon.org.com (unknown [10.44.32.43]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id D969C1955BC0; Mon, 8 Jun 2026 14:56:28 +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 , Eric Van Hensbergen , Dominique Martinet , Ilya Dryomov , Trond Myklebust , 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, Stefan Metzmacher , Shyam Prasad N , Tom Talpey Subject: [PATCH v3 13/22] smbdirect: Support ITER_BVECQ in smbdirect_map_sges_from_iter() Date: Mon, 8 Jun 2026 15:54:21 +0100 Message-ID: <20260608145432.681865-14-dhowells@redhat.com> In-Reply-To: <20260608145432.681865-1-dhowells@redhat.com> References: <20260608145432.681865-1-dhowells@redhat.com> Precedence: bulk X-Mailing-List: linux-cifs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 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;