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[80.116.90.174]) by smtp.gmail.com with ESMTPSA id c22-20020a17090654d600b0070587f81bcfsm9569071ejp.19.2022.06.08.09.51.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 08 Jun 2022 09:51:41 -0700 (PDT) From: Dario Binacchi To: linux-kernel@vger.kernel.org Cc: Amarula patchwork , michael@amarulasolutions.com, Dario Binacchi , "David S. Miller" , Eric Dumazet , Greg Kroah-Hartman , Jakub Kicinski , Jiri Slaby , Marc Kleine-Budde , Paolo Abeni , Sebastian Andrzej Siewior , Vincent Mailhol , Wolfgang Grandegger , linux-can@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH v2 13/13] can: slcan: extend the protocol with CAN state info Date: Wed, 8 Jun 2022 18:51:16 +0200 Message-Id: <20220608165116.1575390-14-dario.binacchi@amarulasolutions.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220608165116.1575390-1-dario.binacchi@amarulasolutions.com> References: <20220608165116.1575390-1-dario.binacchi@amarulasolutions.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org It extends the protocol to receive the adapter CAN state changes (warning, busoff, etc.) and forward them to the netdev upper levels. Signed-off-by: Dario Binacchi --- Changes in v2: - Continue error handling even if no skb can be allocated. drivers/net/can/slcan/slcan-core.c | 66 ++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) diff --git a/drivers/net/can/slcan/slcan-core.c b/drivers/net/can/slcan/slcan-core.c index aba42e284274..22a261f2477c 100644 --- a/drivers/net/can/slcan/slcan-core.c +++ b/drivers/net/can/slcan/slcan-core.c @@ -78,6 +78,9 @@ MODULE_PARM_DESC(maxdev, "Maximum number of slcan interfaces"); #define SLC_CMD_LEN 1 #define SLC_SFF_ID_LEN 3 #define SLC_EFF_ID_LEN 8 +#define SLC_STATE_LEN 1 +#define SLC_STATE_BE_RXCNT_LEN 3 +#define SLC_STATE_BE_TXCNT_LEN 3 struct slcan { struct can_priv can; @@ -170,6 +173,67 @@ int slcan_enable_err_rst_on_open(struct net_device *ndev, bool on) * STANDARD SLCAN DECAPSULATION * ************************************************************************/ +static void slc_bump_state(struct slcan *sl) +{ + struct net_device *dev = sl->dev; + struct sk_buff *skb; + struct can_frame *cf; + char *cmd = sl->rbuff; + u32 rxerr, txerr; + enum can_state state, rx_state, tx_state; + + if (*cmd != 's') + return; + + cmd += SLC_CMD_LEN; + switch (*cmd) { + case 'a': + state = CAN_STATE_ERROR_ACTIVE; + break; + case 'w': + state = CAN_STATE_ERROR_WARNING; + break; + case 'p': + state = CAN_STATE_ERROR_PASSIVE; + break; + case 'f': + state = CAN_STATE_BUS_OFF; + break; + default: + return; + } + + if (state == sl->can.state) + return; + + cmd += SLC_STATE_BE_RXCNT_LEN + 1; + cmd[SLC_STATE_BE_TXCNT_LEN] = 0; + if (kstrtou32(cmd, 10, &txerr)) + return; + + *cmd = 0; + cmd -= SLC_STATE_BE_RXCNT_LEN; + if (kstrtou32(cmd, 10, &rxerr)) + return; + + skb = alloc_can_err_skb(dev, &cf); + + if (skb) { + cf->data[6] = txerr; + cf->data[7] = rxerr; + } + + tx_state = txerr >= rxerr ? state : 0; + rx_state = txerr <= rxerr ? state : 0; + can_change_state(dev, skb ? cf : NULL, tx_state, rx_state); + + if (state == CAN_STATE_BUS_OFF) + can_bus_off(dev); + + if (skb) + netif_rx(skb); +} + static void slc_bump_err(struct slcan *sl) { struct net_device *dev = sl->dev; @@ -372,6 +436,8 @@ static void slc_bump(struct slcan *sl) return slc_bump_frame(sl); case 'e': return slc_bump_err(sl); + case 's': + return slc_bump_state(sl); default: return; }