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 0E5C5370ADF for ; Wed, 22 Jul 2026 13:04:51 +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=1784725494; cv=none; b=gMm2pwg1/sNLOcqZQzkiuogAOXCNmk/5EKREKDaJabNjCHnPNn+brnUyv/l0tTPGZkfPKHLw58FLKV8XQSKMA01HGHT1EprugFhA4SI21eEakLwXB1iw9gdJSKqJcZ9R8RKpWj8Hb+3er7gT+qRih6h3a1O3QCaaBm84HOwCnLQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784725494; c=relaxed/simple; bh=JqBNUSrcvPa6Fe3InLAKcQ2b2TpS/8DgvYkXi0iTlNs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:content-type; b=OFO0dF6UNGRqPyhSkBUl+3gqI7L0Ym4qWzeFqEVKO8oyJ4pVaM6cNr2iGOeyH0viyKT4hox9gsZMA15CN2CXaTJanNdxzqIJ3z5zCMT8jOq3MYeAUkpD6kr5QLsGIJ03QTajte3ziBoF0QAKuR1Socgeh/UtcEov3AWh2TcGBO0= 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=EQg+8ekK; 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="EQg+8ekK" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1784725490; 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=Mi6aeoMT9xaXVA4O3DA9ScLWnT8a4KHMBpulrvNzWqI=; b=EQg+8ekKjAiRGaXO7eWrm5PCmpwFW7dLN7tFMXNjXtOdbujVGuriMMkrBQrI6D4S9eQ0h0 BVIz5J+CLc/CjyDqdqEnz++EeC+FDGTWaozhtCKamA1/NrjccY4qdFuLZXrp+CKuHPHi/V y5nf3IeZfNCYIl5OVzQd9Lmg4fk+Pi4= 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-619-lsJKPsJNOtaA-P3eYvezGA-1; Wed, 22 Jul 2026 09:04:45 -0400 X-MC-Unique: lsJKPsJNOtaA-P3eYvezGA-1 X-Mimecast-MFC-AGG-ID: lsJKPsJNOtaA-P3eYvezGA_1784725482 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 14004182A13B; Wed, 22 Jul 2026 13:04:42 +0000 (UTC) Received: from warthog.procyon.org.com (unknown [10.44.33.159]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id B01B11956042; Wed, 22 Jul 2026 13:04:35 +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 v7 16/29] smbdirect: Support ITER_BVECQ in smbdirect_map_sges_from_iter() Date: Wed, 22 Jul 2026 14:02:03 +0100 Message-ID: <20260722130218.78958-17-dhowells@redhat.com> In-Reply-To: <20260722130218.78958-1-dhowells@redhat.com> References: <20260722130218.78958-1-dhowells@redhat.com> Precedence: bulk X-Mailing-List: v9fs@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: ISHITOrsAZmhYmdXbLJdj02OsNxbvRexYVmNWOVUZrY_1784725482 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 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 | 67 +++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) diff --git a/fs/smb/smbdirect/connection.c b/fs/smb/smbdirect/connection.c index 8adf58097534..f5e7e75dd809 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 +2007,69 @@ 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. @@ -2155,6 +2219,9 @@ 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;