From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E7D9BC55172 for ; Tue, 4 Aug 2026 10:04:25 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4hDpzr1z5zz2yMl; Tue, 04 Aug 2026 20:04:24 +1000 (AEST) Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1785837864; cv=none; b=Irvc4qIEeKBi2XJc7poStAo2UqCocbqAUsfLjs4Wkv7UkFkf5SPPj1tDqNJiSHdZ9YR2DcQY3mFMqviG64NHJN7RsYEEpd4Sxa7zEf5M6uYCORf97UVoBDTYBzc5ffb8Wo5car4BgcO01PiFxZ114b9ObIFRD72yeabP0dZFeg7bLpjIhAsSGWslmr9xZhTnxGzL8833iGReoeXSNzU4HYCvHiEkV77wNDbfK3mmbaEFZS+Gkk6Ib/758liko9ct1YL5lGdXqK89TgAtaspnc492fT/MwdWt8RZP7eKSTNJo8UbOufQ7mZhYkvB9r+AC9Ig1DNPiBjlT7aHLJBb4sA== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1785837864; c=relaxed/relaxed; bh=Mi6aeoMT9xaXVA4O3DA9ScLWnT8a4KHMBpulrvNzWqI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:content-type; b=D/7iPtC/WzoTCEWIjnrF+gpXdGYfscw8wa/wl0XglD+WPJD/12lmZpNI2zPBrmW7C1iBNZEYWgyj8VyTm0kwLKDPRNe169LzTaQS4vBmscWxRaN050dMcpCLsrLa5FaRIvUhZiTVbAoibYjPJMoab43fErrnxq9GiBwVanKfWjZ9zZC3fdzu2NrQU+Wf7H9PkpHpVFKJODVI37Jfl2KqjcyIY+rQbaMUum847D3hPbgQ9DKAMty1aCi10xSyFSdvm9rjjB29jWwxIt5UkijjOKOfNVNqzFZsAOxs5DwXlwgyxTyNqfLW4urnVUNDhlHerN4+1e3OoszwUcbLQNwODg== ARC-Authentication-Results: i=1; lists.ozlabs.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=A1Oo+ueW; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=eWKy7L7v; dkim-atps=neutral; spf=pass (client-ip=170.10.129.124; helo=us-smtp-delivery-124.mimecast.com; envelope-from=dhowells@redhat.com; receiver=lists.ozlabs.org) smtp.mailfrom=redhat.com Authentication-Results: lists.ozlabs.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=A1Oo+ueW; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=eWKy7L7v; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=redhat.com (client-ip=170.10.129.124; helo=us-smtp-delivery-124.mimecast.com; envelope-from=dhowells@redhat.com; receiver=lists.ozlabs.org) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 lists.ozlabs.org (Postfix) with ESMTPS id 4hDpzq2Tgmz2xpn for ; Tue, 04 Aug 2026 20:04:23 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1785837859; 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=A1Oo+ueWdj5/Uks2wnXeH+H787HLvN8k4fV73ss658zXIAooOQPC5+f8XWH5OfY2/JFa6/ J+FRIOcwz2XomthrpDgzfbysh4PBGZx0oVivm1jAHxiuZ5jRYSWXbqpUkLXh0BtBR0/zip FGykbf0Ww8CwoUBArMFk+wAByIK7gTs= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1785837860; 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=eWKy7L7v0NCaQxYIL3qKUtq8UGe+adTewMf+cpmElfaTAnLx+gAVKsaCARWbp54rGRIPyp XygWOmpR06hn6L730iseshbnm4sgYOwvMJanHbu7233XuA8bJoLCTDFihU7mE6kaAd4ZXX Codfejle71mr0ohpdgg1w1uGOJy4vzk= 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-321-Tt7vrssfPwWXrCWw5IYGBw-1; Tue, 04 Aug 2026 06:04:13 -0400 X-MC-Unique: Tt7vrssfPwWXrCWw5IYGBw-1 X-Mimecast-MFC-AGG-ID: Tt7vrssfPwWXrCWw5IYGBw_1785837850 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 AE8A818002CC; Tue, 4 Aug 2026 10:04:10 +0000 (UTC) Received: from warthog.procyon.org.com (unknown [10.44.32.44]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 3ED361956087; Tue, 4 Aug 2026 10:04:04 +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 v8 11/25] smbdirect: Support ITER_BVECQ in smbdirect_map_sges_from_iter() Date: Tue, 4 Aug 2026 11:02:06 +0100 Message-ID: <20260804100224.2748935-12-dhowells@redhat.com> In-Reply-To: <20260804100224.2748935-1-dhowells@redhat.com> References: <20260804100224.2748935-1-dhowells@redhat.com> X-Mailing-List: linux-erofs@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 X-Mimecast-MFC-PROC-ID: hgFkq93xSPdwais_5nE7d2FZuQB5TCSThdW0a0sBzdk_1785837850 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;