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Message-ID: <CACwDmQAZ48JrM3AuiKwuSdhcpfo_d2_P0B+mtd4Mshfa3WUVpA@mail.gmail.com>
Date: Wed, 25 Nov 2020 21:33:48 +0900
From: Bongsu Jeon <bongsu.jeon2@...il.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Bongsu Jeon <bongsu.jeon@...sung.com>,
"davem@...emloft.net" <davem@...emloft.net>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
linux-nfc@...ts.01.org
Subject: Re: [PATCH net-next v2] net/nfc/nci: Support NCI 2.x initial sequence
On Wed, Nov 25, 2020 at 9:03 AM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Mon, 23 Nov 2020 19:12:08 +0900 Bongsu Jeon wrote:
> > implement the NCI 2.x initial sequence to support NCI 2.x NFCC.
> > Since NCI 2.0, CORE_RESET and CORE_INIT sequence have been changed.
> > If NFCEE supports NCI 2.x, then NCI 2.x initial sequence will work.
> >
> > In NCI 1.0, Initial sequence and payloads are as below:
> > (DH) (NFCC)
> > | -- CORE_RESET_CMD --> |
> > | <-- CORE_RESET_RSP -- |
> > | -- CORE_INIT_CMD --> |
> > | <-- CORE_INIT_RSP -- |
> > CORE_RESET_RSP payloads are Status, NCI version, Configuration Status.
> > CORE_INIT_CMD payloads are empty.
> > CORE_INIT_RSP payloads are Status, NFCC Features,
> > Number of Supported RF Interfaces, Supported RF Interface,
> > Max Logical Connections, Max Routing table Size,
> > Max Control Packet Payload Size, Max Size for Large Parameters,
> > Manufacturer ID, Manufacturer Specific Information.
> >
> > In NCI 2.0, Initial Sequence and Parameters are as below:
> > (DH) (NFCC)
> > | -- CORE_RESET_CMD --> |
> > | <-- CORE_RESET_RSP -- |
> > | <-- CORE_RESET_NTF -- |
> > | -- CORE_INIT_CMD --> |
> > | <-- CORE_INIT_RSP -- |
> > CORE_RESET_RSP payloads are Status.
> > CORE_RESET_NTF payloads are Reset Trigger,
> > Configuration Status, NCI Version, Manufacturer ID,
> > Manufacturer Specific Information Length,
> > Manufacturer Specific Information.
> > CORE_INIT_CMD payloads are Feature1, Feature2.
> > CORE_INIT_RSP payloads are Status, NFCC Features,
> > Max Logical Connections, Max Routing Table Size,
> > Max Control Packet Payload Size,
> > Max Data Packet Payload Size of the Static HCI Connection,
> > Number of Credits of the Static HCI Connection,
> > Max NFC-V RF Frame Size, Number of Supported RF Interfaces,
> > Supported RF Interfaces.
> >
> > Signed-off-by: Bongsu Jeon <bongsu.jeon@...sung.com>
>
> NFC folks, looks like when the NFC core got orphaned it lost all links
> in MAINTAINERS. Should we add the L: linux-nfc@...ts.01.org so that
> there is a better chance that someone knowledgeable will provide
> reviews?
>
> Also if anyone is up for it feel free to add your M: or R: entries!
>
Okay. It's better. I will add linux-nfc@...ts.01.org when I resend the
new version.
> > #define NCI_OP_CORE_INIT_CMD nci_opcode_pack(NCI_GID_CORE, 0x01)
> > +/* To support NCI 2.x */
> > +struct nci_core_init_v2_cmd {
> > + unsigned char feature1;
> > + unsigned char feature2;
> > +} __packed;
>
> No need for this to be packed.
>
> > #define NCI_OP_CORE_SET_CONFIG_CMD nci_opcode_pack(NCI_GID_CORE, 0x02)
> > struct set_config_param {
> > @@ -316,6 +326,11 @@ struct nci_core_reset_rsp {
> > __u8 config_status;
> > } __packed;
> >
> > +/* To support NCI ver 2.x */
> > +struct nci_core_reset_rsp_nci_ver2 {
> > + unsigned char status;
> > +} __packed;
>
> ditto
>
Okay I will fix it.
> > #define NCI_OP_CORE_INIT_RSP nci_opcode_pack(NCI_GID_CORE, 0x01)
> > struct nci_core_init_rsp_1 {
> > __u8 status;
> > @@ -334,6 +349,20 @@ struct nci_core_init_rsp_2 {
> > __le32 manufact_specific_info;
> > } __packed;
> >
> > +/* To support NCI ver 2.x */
> > +struct nci_core_init_rsp_nci_ver2 {
> > + unsigned char status;
> > + __le32 nfcc_features;
> > + unsigned char max_logical_connections;
> > + __le16 max_routing_table_size;
> > + unsigned char max_ctrl_pkt_payload_len;
> > + unsigned char max_data_pkt_hci_payload_len;
> > + unsigned char number_of_hci_credit;
> > + __le16 max_nfc_v_frame_size;
> > + unsigned char num_supported_rf_interfaces;
> > + unsigned char supported_rf_interfaces[];
> > +} __packed;
> > +
> > #define NCI_OP_CORE_SET_CONFIG_RSP nci_opcode_pack(NCI_GID_CORE, 0x02)
> > struct nci_core_set_config_rsp {
> > __u8 status;
> > @@ -372,6 +401,16 @@ struct nci_nfcee_discover_rsp {
> > /* --------------------------- */
> > /* ---- NCI Notifications ---- */
> > /* --------------------------- */
> > +#define NCI_OP_CORE_RESET_NTF nci_opcode_pack(NCI_GID_CORE, 0x00)
> > +struct nci_core_reset_ntf {
> > + unsigned char reset_trigger;
> > + unsigned char config_status;
> > + unsigned char nci_ver;
> > + unsigned char manufact_id;
> > + unsigned char manufacturer_specific_len;
> > + __le32 manufact_specific_info;
> > +} __packed;
> > +
> > #define NCI_OP_CORE_CONN_CREDITS_NTF nci_opcode_pack(NCI_GID_CORE, 0x06)
> > struct conn_credit_entry {
> > __u8 conn
> > diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
> > index 4953ee5146e1..68889faadda2 100644
> > --- a/net/nfc/nci/core.c
> > +++ b/net/nfc/nci/core.c
> > @@ -165,7 +165,14 @@ static void nci_reset_req(struct nci_dev *ndev, unsigned long opt)
> >
> > static void nci_init_req(struct nci_dev *ndev, unsigned long opt)
> > {
> > - nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, 0, NULL);
> > + struct nci_core_init_v2_cmd *cmd = (struct nci_core_init_v2_cmd *)opt;
> > +
> > + if (!cmd) {
> > + nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, 0, NULL);
> > + } else {
> > + /* if nci version is 2.0, then use the feature parameters */
> > + nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, sizeof(struct nci_core_init_v2_cmd), cmd);
>
> Please wrap this line.
>
Sorry, Could you explain it in detail?
> > + }
>
> Parenthesis unnecessary.
>
Ok. I will fix it.
> > }
> >
> > static void nci_init_complete_req(struct nci_dev *ndev, unsigned long opt)
>
> > +static unsigned char nci_core_init_rsp_packet_v2(struct nci_dev *ndev, struct sk_buff *skb)
> > +{
> > + struct nci_core_init_rsp_nci_ver2 *rsp = (void *)skb->data;
> > + unsigned char rf_interface_idx = 0;
> > + unsigned char rf_extension_cnt = 0;
> > + unsigned char *supported_rf_interface = rsp->supported_rf_interfaces;
> > +
> > + pr_debug("status %x\n", rsp->status);
> > +
> > + if (rsp->status != NCI_STATUS_OK)
> > + return rsp->status;
> > +
> > + ndev->nfcc_features = __le32_to_cpu(rsp->nfcc_features);
> > + ndev->num_supported_rf_interfaces = rsp->num_supported_rf_interfaces;
> > +
> > + if (ndev->num_supported_rf_interfaces >
> > + NCI_MAX_SUPPORTED_RF_INTERFACES) {
> > + ndev->num_supported_rf_interfaces =
> > + NCI_MAX_SUPPORTED_RF_INTERFACES;
> > + }
>
> brackets unnecessary unnecessary
>
> also:
>
> ndev->num_supported_rf_interfaces =
> min(ndev->num_supported_rf_interfaces,
> NCI_MAX_SUPPORTED_RF_INTERFACES);
>
Okay. I will fix it.
Thanks for reviewing this code.
> > + while (rf_interface_idx < ndev->num_supported_rf_interfaces) {
> > + ndev->supported_rf_interfaces[rf_interface_idx++] = *supported_rf_interface++;
> > +
> > + /* skip rf extension parameters */
> > + rf_extension_cnt = *supported_rf_interface++;
> > + supported_rf_interface += rf_extension_cnt;
> > + }
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