From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 6B5592973CF; Mon, 28 Apr 2025 19:37:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745869028; cv=none; b=d/wsb3ewxN9C0J54k6ptyqkJmPd2vzOkA0rCOTCQiJ8YGTAg7MRhQ/rTLGZ4jqpNI9bteFrIbI1tOR/bx+bK/J5lEtebo0bdGavlIlJcOGLEqKZbXCVD4zyIlvhCaZQ+fc8yKbpCnTh9js3QXNN/bpZCnPB6Fl46deKJcSvm7D0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745869028; c=relaxed/simple; bh=ms3TfLlwCJQk6aSL8rEnyLGEli2nEJ4lwU1S/skoGtE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=KFb9t57jAKUsZEjH/IG/qL7LPJqzKPvTjdAcwyB9c406e8e9WhTIqWaFUyFf9DAnm8rjeTyjWxOst9ViUzF/+ve0WKMVvWnCtQh4wFg0j/WBUwW+ex8GSVhA0KnRUYMEZiSE+eZicuuJlmh789LbNc7V0gJptocfq4BbGdXhXKA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=VMK3JXPg; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="VMK3JXPg" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 22BE4C4CEE4; Mon, 28 Apr 2025 19:37:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1745869027; bh=ms3TfLlwCJQk6aSL8rEnyLGEli2nEJ4lwU1S/skoGtE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VMK3JXPguwaOKFz0vmSDcSYel16b5rrwOeWNxX6CWyzagA2HwY9E9ljrg51Y/6tjS NQ2NTALU8oUC8/mqTPhN4GFRUSFQPXvxFpuiy9w5lvrwbbMouGxMgmmxsGpxg7TkmW OE2cE1oQj4vnVw1PLbIAqsKpkI2bTlTdRP+YxwQAX9uKsYCy3J38CAvbjVVM51U+g4 n+kZAtscIOUjl6Xy7p3n/t6i4La3la0NvCEB/UnanjpZNOapZhH5Vg0PNuAfX4zGFI bBI8Et2b53mKkMGUCP1fVXEtBmf16QM9MRExxrIaP1iXyC06wMWg+6yKCAJ1u1PUp9 giAMq4Y5I+Wtw== From: cel@kernel.org To: NeilBrown , Jeff Layton , Olga Kornievskaia , Dai Ngo , Tom Talpey , Anna Schumaker Cc: , , Chuck Lever Subject: [PATCH v4 02/14] sunrpc: Add a helper to derive maxpages from sv_max_mesg Date: Mon, 28 Apr 2025 15:36:50 -0400 Message-ID: <20250428193702.5186-3-cel@kernel.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250428193702.5186-1-cel@kernel.org> References: <20250428193702.5186-1-cel@kernel.org> Precedence: bulk X-Mailing-List: linux-rdma@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Chuck Lever This page count is to be used to allocate various arrays of pages, bio_vecs, and kvecs, replacing the fixed RPCSVC_MAXPAGES value. The documenting comment is somewhat stale -- of course NFSv4 COMPOUND procedures may have multiple payloads. Reviewed-by: Jeff Layton Signed-off-by: Chuck Lever --- include/linux/sunrpc/svc.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h index 74658cca0f38..e83ac14267e8 100644 --- a/include/linux/sunrpc/svc.h +++ b/include/linux/sunrpc/svc.h @@ -159,6 +159,23 @@ extern u32 svc_max_payload(const struct svc_rqst *rqstp); #define RPCSVC_MAXPAGES ((RPCSVC_MAXPAYLOAD+PAGE_SIZE-1)/PAGE_SIZE \ + 2 + 1) +/** + * svc_serv_maxpages - maximum pages/kvecs needed for one RPC message + * @serv: RPC service context + * + * Returns a count of pages or vectors that can hold the maximum + * size RPC message for @serv. + * + * Each request/reply pair can have at most one "payload", plus two + * pages, one for the request, and one for the reply. + * nfsd_splice_actor() might need an extra page when a READ payload + * is not page-aligned. + */ +static inline unsigned long svc_serv_maxpages(const struct svc_serv *serv) +{ + return DIV_ROUND_UP(serv->sv_max_mesg, PAGE_SIZE) + 2 + 1; +} + /* * The context of a single thread, including the request currently being * processed. -- 2.49.0