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Starke" X-Patchwork-Id: 617437 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 673DCC4332F for ; Fri, 21 Oct 2022 08:45:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230307AbiJUIpq (ORCPT ); Fri, 21 Oct 2022 04:45:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43198 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230299AbiJUIpn (ORCPT ); Fri, 21 Oct 2022 04:45:43 -0400 X-Greylist: delayed 66 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Fri, 21 Oct 2022 01:45:38 PDT Received: from mta-64-226.siemens.flowmailer.net (mta-64-226.siemens.flowmailer.net [185.136.64.226]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CFF01F6C01 for ; Fri, 21 Oct 2022 01:45:34 -0700 (PDT) Received: by mta-64-226.siemens.flowmailer.net with ESMTPSA id 2022102108442855ea76b030667e4596 for ; Fri, 21 Oct 2022 10:44:28 +0200 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; s=fm1; d=siemens.com; i=daniel.starke@siemens.com; h=Date:From:Subject:To:Message-ID:MIME-Version:Content-Type:Content-Transfer-Encoding:Cc:References:In-Reply-To; bh=MX0A7H9NZqNSyTbb2FjZoZDN0/OXbYbIoMSxHeDYXGw=; b=nf14XG27itX3YnVvoN5WVG8MDEcv96xYD2RBYqoYpm8BOQ7zJSsAMhspA287TLi88XDQTb I7Sloc+tIv3bT0pPkT3H+CnLtPPHj7P8Ug+X9MYl/IiQCKgLoxRR1K0pvL47FJFqLRTDU244 ca868RVLc2/9E80U5hrZTefARK0HY=; From: "D. Starke" To: linux-serial@vger.kernel.org, gregkh@linuxfoundation.org, jirislaby@kernel.org Cc: linux-kernel@vger.kernel.org, Daniel Starke Subject: [PATCH 2/3] tty: n_gsm: add parameters used with parameter negotiation Date: Fri, 21 Oct 2022 10:43:14 +0200 Message-Id: <20221021084315.2306-2-daniel.starke@siemens.com> In-Reply-To: <20221021084315.2306-1-daniel.starke@siemens.com> References: <20221021084315.2306-1-daniel.starke@siemens.com> MIME-Version: 1.0 X-Flowmailer-Platform: Siemens Feedback-ID: 519:519-314044:519-21489:flowmailer Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org From: Daniel Starke n_gsm is based on the 3GPP 07.010 and its newer version is the 3GPP 27.010. See https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=1516 The changes from 07.010 to 27.010 are non-functional. Therefore, I refer to the newer 27.010 here. Chapter 5.4.6.3.1 describes the encoding of the parameter negotiation messages. Add the parameters used there to 'gsm_mux' and 'gsm_dlci' and initialize both according to the value ranges and recommended defaults defined in chapter 5.7. Replace the use of the DLC default values from the 'gsm_mux' fields with the DLC specific values from the 'gsm_dlci' fields where applicable. Signed-off-by: Daniel Starke --- drivers/tty/n_gsm.c | 55 +++++++++++++++++++++++++++++++++------------ 1 file changed, 41 insertions(+), 14 deletions(-) diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c index 8e039f2a0427..b6813a134c18 100644 --- a/drivers/tty/n_gsm.c +++ b/drivers/tty/n_gsm.c @@ -75,7 +75,9 @@ module_param(debug, int, 0600); #define T1 10 /* 100mS */ #define T2 34 /* 333mS */ +#define T3 10 /* 10s */ #define N2 3 /* Retry 3 times */ +#define K 2 /* outstanding I frames */ /* Use long timers for testing at low speed with debug on */ #ifdef DEBUG_TIMING @@ -160,7 +162,12 @@ struct gsm_dlci { int prev_adaption; u32 modem_rx; /* Our incoming virtual modem lines */ u32 modem_tx; /* Our outgoing modem lines */ + unsigned int mtu; bool dead; /* Refuse re-open */ + /* Configuration */ + u8 prio; /* Priority */ + u8 ftype; /* Frame type */ + u8 k; /* Window size */ /* Flow control */ bool throttled; /* Private copy of throttle state */ bool constipated; /* Throttle status for outgoing */ @@ -282,8 +289,9 @@ struct gsm_mux { /* Configuration */ int adaption; /* 1 or 2 supported */ u8 ftype; /* UI or UIH */ - int t1, t2; /* Timers in 1/100th of a sec */ + int t1, t2, t3; /* Timers in 1/100th of a sec */ int n2; /* Retry count */ + u8 k; /* Window size */ /* Statistics (not currently exposed) */ unsigned long bad_fcs; @@ -1075,12 +1083,12 @@ static int gsm_dlci_data_output(struct gsm_mux *gsm, struct gsm_dlci *dlci) return 0; /* MTU/MRU count only the data bits but watch adaption mode */ - if ((len + h) > gsm->mtu) - len = gsm->mtu - h; + if ((len + h) > dlci->mtu) + len = dlci->mtu - h; size = len + h; - msg = gsm_data_alloc(gsm, dlci->addr, size, gsm->ftype); + msg = gsm_data_alloc(gsm, dlci->addr, size, dlci->ftype); if (!msg) return -ENOMEM; dp = msg->data; @@ -1144,19 +1152,19 @@ static int gsm_dlci_data_output_framed(struct gsm_mux *gsm, len = dlci->skb->len + overhead; /* MTU/MRU count only the data bits */ - if (len > gsm->mtu) { + if (len > dlci->mtu) { if (dlci->adaption == 3) { /* Over long frame, bin it */ dev_kfree_skb_any(dlci->skb); dlci->skb = NULL; return 0; } - len = gsm->mtu; + len = dlci->mtu; } else last = 1; size = len + overhead; - msg = gsm_data_alloc(gsm, dlci->addr, size, gsm->ftype); + msg = gsm_data_alloc(gsm, dlci->addr, size, dlci->ftype); if (msg == NULL) { skb_queue_tail(&dlci->skb_list, dlci->skb); dlci->skb = NULL; @@ -1213,7 +1221,7 @@ static int gsm_dlci_modem_output(struct gsm_mux *gsm, struct gsm_dlci *dlci, return -EINVAL; } - msg = gsm_data_alloc(gsm, dlci->addr, size, gsm->ftype); + msg = gsm_data_alloc(gsm, dlci->addr, size, dlci->ftype); if (!msg) { pr_err("%s: gsm_data_alloc error", __func__); return -ENOMEM; @@ -1338,8 +1346,9 @@ static void gsm_dlci_data_kick(struct gsm_dlci *dlci) static int gsm_control_command(struct gsm_mux *gsm, int cmd, const u8 *data, int dlen) { - struct gsm_msg *msg = gsm_data_alloc(gsm, 0, dlen + 2, gsm->ftype); + struct gsm_msg *msg; + msg = gsm_data_alloc(gsm, 0, dlen + 2, gsm->dlci[0]->ftype); if (msg == NULL) return -ENOMEM; @@ -1365,7 +1374,8 @@ static void gsm_control_reply(struct gsm_mux *gsm, int cmd, const u8 *data, int dlen) { struct gsm_msg *msg; - msg = gsm_data_alloc(gsm, 0, dlen + 2, gsm->ftype); + + msg = gsm_data_alloc(gsm, 0, dlen + 2, gsm->dlci[0]->ftype); if (msg == NULL) return; msg->data[0] = (cmd & 0xFE) << 1 | EA; /* Clear C/R */ @@ -2075,6 +2085,13 @@ static struct gsm_dlci *gsm_dlci_alloc(struct gsm_mux *gsm, int addr) dlci->gsm = gsm; dlci->addr = addr; dlci->adaption = gsm->adaption; + dlci->mtu = gsm->mtu; + if (addr == 0) + dlci->prio = 0; + else + dlci->prio = ((((addr / 8) + 1) * 8) - 1); + dlci->ftype = gsm->ftype; + dlci->k = gsm->k; dlci->state = DLCI_CLOSED; if (addr) { dlci->data = gsm_dlci_data; @@ -2650,7 +2667,9 @@ static struct gsm_mux *gsm_alloc_mux(void) gsm->t1 = T1; gsm->t2 = T2; + gsm->t3 = T3; gsm->n2 = N2; + gsm->k = K; gsm->ftype = UIH; gsm->adaption = 1; gsm->encoding = GSM_ADV_OPT; @@ -2691,7 +2710,7 @@ static void gsm_copy_config_values(struct gsm_mux *gsm, c->initiator = gsm->initiator; c->t1 = gsm->t1; c->t2 = gsm->t2; - c->t3 = 0; /* Not supported */ + c->t3 = gsm->t3; c->n2 = gsm->n2; if (gsm->ftype == UIH) c->i = 1; @@ -2700,7 +2719,7 @@ static void gsm_copy_config_values(struct gsm_mux *gsm, pr_debug("Ftype %d i %d\n", gsm->ftype, c->i); c->mru = gsm->mru; c->mtu = gsm->mtu; - c->k = 0; + c->k = gsm->k; } static int gsm_config(struct gsm_mux *gsm, struct gsm_config *c) @@ -2717,12 +2736,16 @@ static int gsm_config(struct gsm_mux *gsm, struct gsm_config *c) return -EINVAL; if (c->mru > MAX_MRU || c->mtu > MAX_MTU) return -EINVAL; + if (c->t3 > 255) + return -EINVAL; if (c->n2 > 255) return -EINVAL; if (c->encapsulation > 1) /* Basic, advanced, no I */ return -EINVAL; if (c->initiator > 1) return -EINVAL; + if (c->k > 7) + return -EINVAL; if (c->i == 0 || c->i > 2) /* UIH and UI only */ return -EINVAL; /* @@ -2770,6 +2793,10 @@ static int gsm_config(struct gsm_mux *gsm, struct gsm_config *c) gsm->t1 = c->t1; if (c->t2) gsm->t2 = c->t2; + if (c->t3) + gsm->t3 = c->t3; + if (c->k) + gsm->k = c->k; /* * FIXME: We need to separate activation/deactivation from adding @@ -3298,9 +3325,9 @@ static int gsm_create_network(struct gsm_dlci *dlci, struct gsm_netconfig *nc) pr_err("alloc_netdev failed\n"); return -ENOMEM; } - net->mtu = dlci->gsm->mtu; + net->mtu = dlci->mtu; net->min_mtu = MIN_UNIT_SIZE; - net->max_mtu = dlci->gsm->mtu; + net->max_mtu = dlci->mtu; mux_net = netdev_priv(net); mux_net->dlci = dlci; kref_init(&mux_net->ref);