Re: [PATCH RFC] brcmfmac: support deleting MBSS AP interfaces

Arend van Spriel
2016-06-01T19:00:47Z

On 01-06-16 16:36, Rafał Miłecki wrote:
> We already support adding extra (AP) interfaces so it also makes an
> obvious sense to allow deleting them.
>
> Adding a new interface is implemented by sending request to firmware for
> creating a new BSS and waiting for a proper event. Ideally deleting
> interface should be handled in a similar way. There should be a request
> to firmware for deleting BSS and firmware should respond with an event.
>
> Unfortunately it doesn't seem to work with recent firmwares. They never
> seem to delete BSS and never send BRCMF_E_IF_DEL. As a workaround this
> patch deletes Linux interface while keeping a track of BSSes present in
> a firmware. If there is request for adding a new interface this code is
> capable of reusing existing BSS-es.

It is not so much an issue of recent firmware. Actually, on recent
firmware 7.x.y.z and higher there are other command to create *and*
delete additional interfaces. On the other hand we aim to support a
large number of devices going back to bcm4329 so we have to come up with
a scheme to use the new commands or fallback to old api. Let's hope we
can reuse much of this effort you put in.

> Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
> ---
> .../broadcom/brcm80211/brcmfmac/cfg80211.c | 84 +++++++++++++++-------
> .../wireless/broadcom/brcm80211/brcmfmac/core.c | 6 +-
> .../wireless/broadcom/brcm80211/brcmfmac/core.h | 4 +-
> .../wireless/broadcom/brcm80211/brcmfmac/fweh.c | 4 +-
> 4 files changed, 71 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
> index d23b95e..ce35ada 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
> @@ -35,6 +35,7 @@
> #include "cfg80211.h"
> #include "feature.h"
> #include "fwil.h"
> +#include "fwsignal.h"
> #include "proto.h"
> #include "vendor.h"
> #include "bus.h"
> @@ -556,10 +557,10 @@ static int brcmf_get_first_free_bsscfgidx(struct brcmf_pub *drvr)
> return -ENOMEM;
> }
>
> -static int brcmf_cfg80211_request_ap_if(struct brcmf_if *ifp)
> +static int brcmf_cfg80211_request_ap_if(struct brcmf_cfg80211_info *cfg, int bsscfgidx)
> {
> + struct brcmf_if *ifp = netdev_priv(cfg_to_ndev(cfg));
> struct brcmf_mbss_ssid_le mbss_ssid_le;
> - int bsscfgidx;
> int err;
>
> memset(&mbss_ssid_le, 0, sizeof(mbss_ssid_le));
> @@ -594,6 +595,7 @@ struct wireless_dev *brcmf_ap_add_vif(struct wiphy *wiphy, const char *name,
> struct brcmf_cfg80211_info *cfg = wiphy_to_cfg(wiphy);
> struct brcmf_if *ifp = netdev_priv(cfg_to_ndev(cfg));
> struct brcmf_cfg80211_vif *vif;
> + int bsscfgidx;
> int err;
>
> if (brcmf_cfg80211_vif_event_armed(cfg))
> @@ -605,30 +607,49 @@ struct wireless_dev *brcmf_ap_add_vif(struct wiphy *wiphy, const char *name,
> if (IS_ERR(vif))
> return (struct wireless_dev *)vif;
>
> - brcmf_cfg80211_arm_vif_event(cfg, vif);
> + bsscfgidx = brcmf_get_first_free_bsscfgidx(cfg->pub);
> + brcmf_err("bsscfgidx:%d cfg->pub->bss2if[bsscfgidx]:%d\n", bsscfgidx, cfg->pub->bss2if[bsscfgidx]);

Looks like debugging code. If you want to keep it, make it
brcmf_dbg(INFO, ...).

> + if (cfg->pub->bss2if[bsscfgidx] != BRCMF_IDX_INVALID) {
> + ifp = brcmf_add_if(cfg->pub, bsscfgidx, cfg->pub->bss2if[bsscfgidx], false, "wlan%d", params->macaddr);
> + if (IS_ERR(ifp)) {
> + err = PTR_ERR(ifp);
> + goto fail;
> + }
> + brcmf_fws_add_interface(ifp);
>
> - err = brcmf_cfg80211_request_ap_if(ifp);
> - if (err) {
> - brcmf_cfg80211_arm_vif_event(cfg, NULL);
> - goto fail;
> - }
> + ifp->vif = vif;
> + vif->ifp = ifp;
> + if (ifp->ndev) {
> + vif->wdev.netdev = ifp->ndev;
> + ifp->ndev->ieee80211_ptr = &vif->wdev;
> + SET_NETDEV_DEV(ifp->ndev, wiphy_dev(cfg->wiphy));
> + }
> + } else {
> + brcmf_cfg80211_arm_vif_event(cfg, vif);
>
> - /* wait for firmware event */
> - err = brcmf_cfg80211_wait_vif_event(cfg, BRCMF_E_IF_ADD,
> - BRCMF_VIF_EVENT_TIMEOUT);
> - brcmf_cfg80211_arm_vif_event(cfg, NULL);
> - if (!err) {
> - brcmf_err("timeout occurred\n");
> - err = -EIO;
> - goto fail;
> - }
> + err = brcmf_cfg80211_request_ap_if(cfg, bsscfgidx);
> + if (err) {
> + brcmf_cfg80211_arm_vif_event(cfg, NULL);
> + goto fail;
> + }
>
> - /* interface created in firmware */
> - ifp = vif->ifp;
> - if (!ifp) {
> - brcmf_err("no if pointer provided\n");
> - err = -ENOENT;
> - goto fail;
> + /* wait for firmware event */
> + err = brcmf_cfg80211_wait_vif_event(cfg, BRCMF_E_IF_ADD,
> + BRCMF_VIF_EVENT_TIMEOUT);
> + brcmf_cfg80211_arm_vif_event(cfg, NULL);
> + if (!err) {
> + brcmf_err("timeout occurred\n");
> + err = -EIO;
> + goto fail;
> + }
> +
> + /* interface created in firmware */
> + ifp = vif->ifp;
> + if (!ifp) {
> + brcmf_err("no if pointer provided\n");
> + err = -ENOENT;
> + goto fail;
> + }
> }
>
> strncpy(ifp->ndev->name, name, sizeof(ifp->ndev->name) - 1);
> @@ -781,12 +802,26 @@ s32 brcmf_notify_escan_complete(struct brcmf_cfg80211_info *cfg,
> return err;
> }
>
> +static int brcmf_cfg80211_del_ap_iface(struct wiphy *wiphy,
> + struct wireless_dev *wdev)
> +{
> + struct net_device *ndev = wdev->netdev;
> + struct brcmf_if *ifp = netdev_priv(ndev);
> +
> + brcmf_remove_interface(ifp);
> +
> + return 0;
> +}
> +
> static
> int brcmf_cfg80211_del_iface(struct wiphy *wiphy, struct wireless_dev *wdev)
> {
> struct brcmf_cfg80211_info *cfg = wiphy_priv(wiphy);
> struct net_device *ndev = wdev->netdev;
>
> + if (ndev == cfg_to_ndev(cfg))
> + return -ENOTSUPP;
> +
> /* vif event pending in firmware */
> if (brcmf_cfg80211_vif_event_armed(cfg))
> return -EBUSY;
> @@ -803,12 +838,13 @@ int brcmf_cfg80211_del_iface(struct wiphy *wiphy, struct wireless_dev *wdev)
> switch (wdev->iftype) {
> case NL80211_IFTYPE_ADHOC:
> case NL80211_IFTYPE_STATION:
> - case NL80211_IFTYPE_AP:
> case NL80211_IFTYPE_AP_VLAN:
> case NL80211_IFTYPE_WDS:
> case NL80211_IFTYPE_MONITOR:
> case NL80211_IFTYPE_MESH_POINT:
> return -EOPNOTSUPP;
> + case NL80211_IFTYPE_AP:
> + return brcmf_cfg80211_del_ap_iface(wiphy, wdev);
> case NL80211_IFTYPE_P2P_CLIENT:
> case NL80211_IFTYPE_P2P_GO:
> case NL80211_IFTYPE_P2P_DEVICE:
> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
> index 6a76480..1208c21 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
> @@ -634,7 +634,7 @@ fail:
> }
>
> struct brcmf_if *brcmf_add_if(struct brcmf_pub *drvr, s32 bsscfgidx, s32 ifidx,
> - bool is_p2pdev, char *name, u8 *mac_addr)
> + bool is_p2pdev, const char *name, u8 *mac_addr)

Seems like an unrelated change.

> {
> struct brcmf_if *ifp;
> struct net_device *ndev;
> @@ -680,6 +680,8 @@ struct brcmf_if *brcmf_add_if(struct brcmf_pub *drvr, s32 bsscfgidx, s32 ifidx,
> /* store mapping ifidx to bsscfgidx */
> if (drvr->if2bss[ifidx] == BRCMF_BSSIDX_INVALID)
> drvr->if2bss[ifidx] = bsscfgidx;
> + if (drvr->bss2if[bsscfgidx] == BRCMF_IDX_INVALID)
> + drvr->bss2if[bsscfgidx] = ifidx;
> }
>
> ifp->drvr = drvr;
> @@ -910,6 +912,8 @@ int brcmf_attach(struct device *dev, struct brcmf_mp_device *settings)
>
> for (i = 0; i < ARRAY_SIZE(drvr->if2bss); i++)
> drvr->if2bss[i] = BRCMF_BSSIDX_INVALID;
> + for (i = 0; i < ARRAY_SIZE(drvr->bss2if); i++)
> + drvr->bss2if[i] = BRCMF_IDX_INVALID;

both have size BRCMF_MAX_IFS so might stick with one loop as it is
unlikely the size of these two arrays will ever differ.

> mutex_init(&drvr->proto_block);
>
> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.h
> index 2a075c5..edd322a 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.h
> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.h
> @@ -29,6 +29,7 @@
>
> /* For supporting multiple interfaces */
> #define BRCMF_MAX_IFS 16
> +#define BRCMF_IDX_INVALID -1
>
> /* Small, medium and maximum buffer size for dcmd
> */
> @@ -125,6 +126,7 @@ struct brcmf_pub {
>
> struct brcmf_if *iflist[BRCMF_MAX_IFS];
> s32 if2bss[BRCMF_MAX_IFS];
> + s32 bss2if[BRCMF_MAX_IFS];
>
> struct mutex proto_block;
> unsigned char proto_buf[BRCMF_DCMD_MAXLEN];
> @@ -215,7 +217,7 @@ char *brcmf_ifname(struct brcmf_if *ifp);
> struct brcmf_if *brcmf_get_ifp(struct brcmf_pub *drvr, int ifidx);
> int brcmf_net_attach(struct brcmf_if *ifp, bool rtnl_locked);
> struct brcmf_if *brcmf_add_if(struct brcmf_pub *drvr, s32 bsscfgidx, s32 ifidx,
> - bool is_p2pdev, char *name, u8 *mac_addr);
> + bool is_p2pdev, const char *name, u8 *mac_addr);
> void brcmf_remove_interface(struct brcmf_if *ifp);
> void brcmf_txflowblock_if(struct brcmf_if *ifp,
> enum brcmf_netif_stop_reason reason, bool state);
> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c
> index b390561..5bde857 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c
> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c
> @@ -182,8 +182,10 @@ static void brcmf_fweh_handle_if_event(struct brcmf_pub *drvr,
>
> err = brcmf_fweh_call_event_handler(ifp, emsg->event_code, emsg, data);
>
> - if (ifp && ifevent->action == BRCMF_E_IF_DEL)
> + if (ifp && ifevent->action == BRCMF_E_IF_DEL) {
> brcmf_remove_interface(ifp);
> + drvr->bss2if[ifp->bsscfgidx] = BRCMF_IDX_INVALID;

Why not do this in brcmf_remove_interface(). Seems more clean to me.

Regards,
Arend