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Date: Wed, 3 Nov 2021 17:38:32 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Ricardo Martinez <ricardo.martinez@...ux.intel.com>
Cc: netdev@...r.kernel.org, linux-wireless@...r.kernel.org,
kuba@...nel.org, davem@...emloft.net, johannes@...solutions.net,
ryazanov.s.a@...il.com, loic.poulain@...aro.org,
m.chetan.kumar@...el.com, chandrashekar.devegowda@...el.com,
linuxwwan@...el.com, chiranjeevi.rapolu@...ux.intel.com,
haijun.liu@...iatek.com, amir.hanania@...el.com,
dinesh.sharma@...el.com, eliot.lee@...el.com,
mika.westerberg@...ux.intel.com, moises.veleta@...el.com,
pierre-louis.bossart@...el.com, muralidharan.sethuraman@...el.com,
Soumya.Prakash.Mishra@...el.com, sreehari.kancharla@...el.com,
suresh.nagaraj@...el.com
Subject: Re: [PATCH v2 04/14] net: wwan: t7xx: Add port proxy infrastructure
On Sun, Oct 31, 2021 at 08:56:25PM -0700, Ricardo Martinez wrote:
> From: Haijun Lio <haijun.liu@...iatek.com>
>
> Port-proxy provides a common interface to interact with different types
> of ports. Ports export their configuration via `struct t7xx_port` and
> operate as defined by `struct port_ops`.
Same here, assuming that the comments from the previous patches are applied
here as well, only unique are given.
...
> - if (stage == HIF_EX_CLEARQ_DONE)
> + if (stage == HIF_EX_CLEARQ_DONE) {
> /* give DHL time to flush data.
> * this is an empirical value that assure
> * that DHL have enough time to flush all the date.
> */
> msleep(PORT_RESET_DELAY_US);
> + }
These curly brackets should be part of previous patch. Try to minimize
(ideally avoid) ping-pong style of changes in the same series.
...
> +#define CCCI_MAX_CH_ID 0xff /* RX channel ID should NOT be >= this!! */
I haven't got the details behind the comment. Is the Rx channel ID predefined
somewhere? If so, use static_assert() instead of this comment.
...
> +enum ccci_ch {
> + /* to MD */
> + CCCI_CONTROL_RX = 0x2000,
> + CCCI_CONTROL_TX = 0x2001,
> + CCCI_SYSTEM_RX = 0x2002,
> + CCCI_SYSTEM_TX = 0x2003,
> + CCCI_UART1_RX = 0x2006, /* META */
> + CCCI_UART1_RX_ACK = 0x2007,
> + CCCI_UART1_TX = 0x2008,
> + CCCI_UART1_TX_ACK = 0x2009,
> + CCCI_UART2_RX = 0x200a, /* AT */
> + CCCI_UART2_RX_ACK = 0x200b,
> + CCCI_UART2_TX = 0x200c,
> + CCCI_UART2_TX_ACK = 0x200d,
> + CCCI_MD_LOG_RX = 0x202a, /* MD logging */
> + CCCI_MD_LOG_TX = 0x202b,
> + CCCI_LB_IT_RX = 0x203e, /* loop back test */
> + CCCI_LB_IT_TX = 0x203f,
> + CCCI_STATUS_RX = 0x2043, /* status polling */
> + CCCI_STATUS_TX = 0x2044,
> + CCCI_MIPC_RX = 0x20ce, /* MIPC */
> + CCCI_MIPC_TX = 0x20cf,
> + CCCI_MBIM_RX = 0x20d0,
> + CCCI_MBIM_TX = 0x20d1,
> + CCCI_DSS0_RX = 0x20d2,
> + CCCI_DSS0_TX = 0x20d3,
> + CCCI_DSS1_RX = 0x20d4,
> + CCCI_DSS1_TX = 0x20d5,
> + CCCI_DSS2_RX = 0x20d6,
> + CCCI_DSS2_TX = 0x20d7,
> + CCCI_DSS3_RX = 0x20d8,
> + CCCI_DSS3_TX = 0x20d9,
> + CCCI_DSS4_RX = 0x20da,
> + CCCI_DSS4_TX = 0x20db,
> + CCCI_DSS5_RX = 0x20dc,
> + CCCI_DSS5_TX = 0x20dd,
> + CCCI_DSS6_RX = 0x20de,
> + CCCI_DSS6_TX = 0x20df,
> + CCCI_DSS7_RX = 0x20e0,
> + CCCI_DSS7_TX = 0x20e1,
> + CCCI_MAX_CH_NUM,
Not sure about meaning of this and even needfulness. It's obvious you don't
care about actual value here.
> + CCCI_MONITOR_CH_ID = GENMASK(31, 28), /* for MD init */
> + CCCI_INVALID_CH_ID = GENMASK(15, 0),
> +};
...
> +#define MTK_DEV_NAME "MTK_WWAN_M80"
DEV?
...
> +/* port->minor is configured in-sequence, but when we use it in code
> + * it should be unique among all ports for addressing.
> + */
> +#define TTY_IPC_MINOR_BASE 100
> +#define TTY_PORT_MINOR_BASE 250
> +#define TTY_PORT_MINOR_INVALID -1
Why it's not automatically allocated?
...
> +static struct t7xx_port md_ccci_ports[] = {
> + {0, 0, 0, 0, 0, 0, ID_CLDMA1, 0, &dummy_port_ops, 0xff, "dummy_port",},
Use C99 initializers.
> +};
...
> + nlh = nlmsg_put(nl_skb, 0, 1, NLMSG_DONE, len, 0);
> + if (!nlh) {
> + dev_err(port->dev, "could not release netlink\n");
I'm wondering why you are not using net_err() / netdev_err() / netif_err()
where it's appropriate.
> + nlmsg_free(nl_skb);
> + return -EFAULT;
> + }
...
> + return netlink_broadcast(pprox->netlink_sock, nl_skb,
> + 0, grp, GFP_KERNEL);
One line?
...
> +static int port_netlink_init(void)
> +{
> + port_prox->netlink_sock = netlink_kernel_create(&init_net, PORT_NOTIFY_PROTOCOL, NULL);
> +
> + if (!port_prox->netlink_sock) {
> + dev_err(port_prox->dev, "failed to create netlink socket\n");
> + return -ENOMEM;
> + }
> +
> + return 0;
> +}
> +
> +static void port_netlink_uninit(void)
> +{
> + if (port_prox->netlink_sock) {
if (!->netlink_sock) ?
> + netlink_kernel_release(port_prox->netlink_sock);
> + port_prox->netlink_sock = NULL;
> + }
> +}
...
> +static struct t7xx_port *proxy_get_port(int minor, enum ccci_ch ch)
> +{
> + struct t7xx_port *port;
> + int i;
> +
> + if (!port_prox)
> + return NULL;
> +
> + for_each_proxy_port(i, port, port_prox) {
> + if (minor >= 0 && port->minor == minor)
> + return port;
> +
> + if (ch != CCCI_INVALID_CH_ID && (port->rx_ch == ch || port->tx_ch == ch))
> + return port;
> + }
> +
> + return NULL;
> +}
> +
> +struct t7xx_port *port_proxy_get_port(int major, int minor)
> +{
> + if (port_prox && port_prox->major == major)
> + return proxy_get_port(minor, CCCI_INVALID_CH_ID);
> +
> + return NULL;
> +}
Looking into the second one I would definitely refactor the first one
static struct t7xx_port *do_proxy_get_port(int minor, enum ccci_ch ch)
{
struct t7xx_port *port;
int i;
for_each_proxy_port(i, port, port_prox) {
if (minor >= 0 && port->minor == minor)
return port;
if (ch != CCCI_INVALID_CH_ID && (port->rx_ch == ch || port->tx_ch == ch))
return port;
}
return NULL;
}
// If it's even needed at all... Perhaps you may move NULL check to the (single?) caller
static struct t7xx_port *proxy_get_port(int minor, enum ccci_ch ch)
{
if (port_prox)
return do_proxy_get_port(minor, ch);
return NULL;
}
struct t7xx_port *port_proxy_get_port(int major, int minor)
{
if (port_prox && port_prox->major == major)
return do_proxy_get_port(minor, CCCI_INVALID_CH_ID);
return NULL;
}
> +static inline struct t7xx_port *port_get_by_ch(enum ccci_ch ch)
> +{
> + return proxy_get_port(TTY_PORT_MINOR_INVALID, ch);
> +}
...
> + ccci_h = (struct ccci_header *)skb->data;
Do you need casting?
...
> + if (port->flags & PORT_F_USER_HEADER) { /* header provide by user */
Is it proper English in the comment?
> + /* CCCI_MON_CH should fall in here, as header must be
> + * send to md_init.
> + */
> + if (ccci_h->data[0] == CCCI_HEADER_NO_DATA) {
> + if (skb->len > sizeof(struct ccci_header)) {
> + dev_err_ratelimited(port->dev,
> + "recv unexpected data for %s, skb->len=%d\n",
> + port->name, skb->len);
> + skb_trim(skb, sizeof(struct ccci_header));
> + }
> + }
> + } else {
> + /* remove CCCI header */
> + skb_pull(skb, sizeof(struct ccci_header));
> + }
...
> +int port_proxy_send_skb(struct t7xx_port *port, struct sk_buff *skb, bool from_pool)
> +{
> + struct ccci_header *ccci_h;
> + unsigned char tx_qno;
> + int ret;
> +
> + ccci_h = (struct ccci_header *)(skb->data);
> + tx_qno = port_get_queue_no(port);
> + port_proxy_set_seq_num(port, (struct ccci_header *)ccci_h);
> + ret = cldma_send_skb(port->path_id, tx_qno, skb, from_pool, true);
> + if (ret) {
> + dev_err(port->dev, "failed to send skb, error: %d\n", ret);
> + } else {
> + /* Record the port seq_num after the data is sent to HIF.
> + * Only bits 0-14 are used, thus negating overflow.
> + */
> + port->seq_nums[MTK_OUT]++;
> + }
> +
> + return ret;
The density of the characters is a bit high. Why not refactor this?
...blank line here...
ret = cldma_send_skb(port->path_id, tx_qno, skb, from_pool, true);
if (ret) {
dev_err(port->dev, "failed to send skb, error: %d\n", ret);
return ret;
}
...
> +}
...
> + port_list = &port_prox->rx_ch_ports[channel & CCCI_CH_ID_MASK];
> + list_for_each_entry(port, port_list, entry) {
> + if (queue->hif_id != port->path_id || channel != port->rx_ch)
> + continue;
> +
> + /* Multi-cast is not supported, because one port may be freed
> + * and can modify this request before another port can process it.
> + * However we still can use req->state to achieve some kind of
> + * multi-cast if needed.
> + */
> + if (port->ops->recv_skb) {
> + seq_num = port_check_rx_seq_num(port, ccci_h);
> + ret = port->ops->recv_skb(port, skb);
> + /* If the packet is stored to RX buffer
> + * successfully or drop, the sequence
> + * num will be updated.
> + */
> + if (ret == -ENOBUFS)
Why you don't need to free SKB here?
> + return ret;
> +
> + port->seq_nums[MTK_IN] = seq_num;
> + }
> +
> + break;
> + }
> +
> +err_exit:
> + if (ret < 0) {
> + struct skb_pools *pools;
> +
> + pools = &queue->md->mtk_dev->pools;
> + ccci_free_skb(pools, skb);
> + return -ENETDOWN;
> + }
> +
> + return 0;
Why not simply split this to
return 0;
// pay attention to the label naming
err_free_skb:
ccci_free_skb(&queue->md->mtk_dev->pools, skb);
return -ENETDOWN;
I suspect that this may be part of something bigger which is comming,
so try to minimize both weirdness here and additional shuffling
somewhere else in that case.
...
> + for_each_proxy_port(i, port, port_prox)
> + if (port->ops->md_state_notify)
> + port->ops->md_state_notify(port, state);
Perhaps {} ?
...
> + for_each_proxy_port(i, port, port_prox)
> + if (!strncmp(port->name, port_name, strlen(port->name)))
> + return port;
Ditto.
...
> + switch (state) {
> + case MTK_PORT_STATE_ENABLE:
> + snprintf(msg, PORT_NETLINK_MSG_MAX_PAYLOAD, "enable %s", port->name);
sizeof(msg) is much shorter and flexible.
> + break;
> +
> + case MTK_PORT_STATE_DISABLE:
> + snprintf(msg, PORT_NETLINK_MSG_MAX_PAYLOAD, "disable %s", port->name);
> + break;
> +
> + default:
> + snprintf(msg, PORT_NETLINK_MSG_MAX_PAYLOAD, "invalid operation");
> + break;
> + }
...
> +struct ctrl_msg_header {
> + u32 ctrl_msg_id;
> + u32 reserved;
> + u32 data_length;
> + u8 data[0];
We don't allow VLAs.
> +};
> +
> +struct port_msg {
> + u32 head_pattern;
> + u32 info;
> + u32 tail_pattern;
> + u8 data[0]; /* port set info */
Ditto.
> +};
...
> - if (event->event_id == CCCI_EVENT_MD_EX_PASS)
> + if (event->event_id == CCCI_EVENT_MD_EX_PASS) {
> + pass = true;
> fsm_finish_event(ctl, event);
> + }
Make curly braces to go to the previous patch despite checkpatch warnings.
--
With Best Regards,
Andy Shevchenko
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