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Date: Fri, 8 Apr 2022 11:49:49 +0200 (CEST)
From: Julia Lawall <julia.lawall@...ia.fr>
To: Jaehee Park <jhpark1013@...il.com>
cc: Jérôme Pouiller <jerome.pouiller@...abs.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
outreachy@...ts.linux.dev, Stefano Brivio <sbrivio@...hat.com>
Subject: Re: [PATCH] staging: wfx: use container_of() to get vif
On Thu, 7 Apr 2022, Jaehee Park wrote:
> Use container_of() to get vif. This improves the code in two ways:
> [1] it speeds up the compilation because container_of() saves steps to
> retrieve vif (the representation of ieee80211_vif), and
I don't understand this part.
julia
> [2] it eliminates the need to define multiple pointers. Previously,
> after setting the pointer to drv_priv, another pointer had to be
> defined by vif in struct wfx_vif to point back to ieee80211_vif.
> Remove vif from the struct wfx_vif, define a macro wvif_to_vif(ptr)
> for container_of(), and replace all wvif->vif with the newly defined
> container_of() construct.
>
> Signed-off-by: Jaehee Park <jhpark1013@...il.com>
> ---
> Questions:
> - These changes built for me, but it would be great if someone can test it on the actual hardware.
> - We noticed that the development of the wfx driver is happening in netdev instead of the staging directory. Do you suggest that I use the net-next tree for this change?
>
> drivers/staging/wfx/data_rx.c | 4 ++--
> drivers/staging/wfx/data_tx.c | 2 +-
> drivers/staging/wfx/key.c | 3 +--
> drivers/staging/wfx/queue.c | 2 +-
> drivers/staging/wfx/scan.c | 6 ++---
> drivers/staging/wfx/sta.c | 45 ++++++++++++++++-------------------
> drivers/staging/wfx/wfx.h | 3 ++-
> 7 files changed, 31 insertions(+), 34 deletions(-)
>
> diff --git a/drivers/staging/wfx/data_rx.c b/drivers/staging/wfx/data_rx.c
> index a4b5ffe158e4..98c2223089b8 100644
> --- a/drivers/staging/wfx/data_rx.c
> +++ b/drivers/staging/wfx/data_rx.c
> @@ -24,12 +24,12 @@ static void wfx_rx_handle_ba(struct wfx_vif *wvif, struct ieee80211_mgmt *mgmt)
> case WLAN_ACTION_ADDBA_REQ:
> params = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
> tid = (params & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
> - ieee80211_start_rx_ba_session_offl(wvif->vif, mgmt->sa, tid);
> + ieee80211_start_rx_ba_session_offl(wvif_to_vif(wvif), mgmt->sa, tid);
> break;
> case WLAN_ACTION_DELBA:
> params = le16_to_cpu(mgmt->u.action.u.delba.params);
> tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
> - ieee80211_stop_rx_ba_session_offl(wvif->vif, mgmt->sa, tid);
> + ieee80211_stop_rx_ba_session_offl(wvif_to_vif(wvif), mgmt->sa, tid);
> break;
> }
> }
> diff --git a/drivers/staging/wfx/data_tx.c b/drivers/staging/wfx/data_tx.c
> index e07381b2ff4d..fd79e03a08c5 100644
> --- a/drivers/staging/wfx/data_tx.c
> +++ b/drivers/staging/wfx/data_tx.c
> @@ -216,7 +216,7 @@ static u8 wfx_tx_get_link_id(struct wfx_vif *wvif, struct ieee80211_sta *sta,
>
> if (sta_priv && sta_priv->link_id)
> return sta_priv->link_id;
> - if (wvif->vif->type != NL80211_IFTYPE_AP)
> + if (wvif_to_vif(wvif)->type != NL80211_IFTYPE_AP)
> return 0;
> if (is_multicast_ether_addr(da))
> return 0;
> diff --git a/drivers/staging/wfx/key.c b/drivers/staging/wfx/key.c
> index 8f23e8d42bd4..71b1fca70248 100644
> --- a/drivers/staging/wfx/key.c
> +++ b/drivers/staging/wfx/key.c
> @@ -174,7 +174,7 @@ static int wfx_add_key(struct wfx_vif *wvif, struct ieee80211_sta *sta,
> k.type = fill_tkip_pair(&k.key.tkip_pairwise_key, key, sta->addr);
> else
> k.type = fill_tkip_group(&k.key.tkip_group_key, key, &seq,
> - wvif->vif->type);
> + wvif_to_vif(wvif)->type);
> } else if (key->cipher == WLAN_CIPHER_SUITE_CCMP) {
> if (pairwise)
> k.type = fill_ccmp_pair(&k.key.aes_pairwise_key, key, sta->addr);
> @@ -224,4 +224,3 @@ int wfx_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd, struct ieee80211_
> mutex_unlock(&wvif->wdev->conf_mutex);
> return ret;
> }
> -
> diff --git a/drivers/staging/wfx/queue.c b/drivers/staging/wfx/queue.c
> index 729825230db2..a2745d1024c6 100644
> --- a/drivers/staging/wfx/queue.c
> +++ b/drivers/staging/wfx/queue.c
> @@ -207,7 +207,7 @@ bool wfx_tx_queues_has_cab(struct wfx_vif *wvif)
> {
> int i;
>
> - if (wvif->vif->type != NL80211_IFTYPE_AP)
> + if (wvif_to_vif(wvif)->type != NL80211_IFTYPE_AP)
> return false;
> for (i = 0; i < IEEE80211_NUM_ACS; ++i)
> /* Note: since only AP can have mcast frames in queue and only one vif can be AP,
> diff --git a/drivers/staging/wfx/scan.c b/drivers/staging/wfx/scan.c
> index 7f34f0d322f9..5c25fde3fc41 100644
> --- a/drivers/staging/wfx/scan.c
> +++ b/drivers/staging/wfx/scan.c
> @@ -25,7 +25,7 @@ static int update_probe_tmpl(struct wfx_vif *wvif, struct cfg80211_scan_request
> {
> struct sk_buff *skb;
>
> - skb = ieee80211_probereq_get(wvif->wdev->hw, wvif->vif->addr, NULL, 0, req->ie_len);
> + skb = ieee80211_probereq_get(wvif->wdev->hw, wvif_to_vif(wvif)->addr, NULL, 0, req->ie_len);
> if (!skb)
> return -ENOMEM;
>
> @@ -75,8 +75,8 @@ static int send_scan_req(struct wfx_vif *wvif, struct cfg80211_scan_request *req
> } else {
> ret = wvif->scan_nb_chan_done;
> }
> - if (req->channels[start_idx]->max_power != wvif->vif->bss_conf.txpower)
> - wfx_hif_set_output_power(wvif, wvif->vif->bss_conf.txpower);
> + if (req->channels[start_idx]->max_power != wvif_to_vif(wvif)->bss_conf.txpower)
> + wfx_hif_set_output_power(wvif, wvif_to_vif(wvif)->bss_conf.txpower);
> wfx_tx_unlock(wvif->wdev);
> return ret;
> }
> diff --git a/drivers/staging/wfx/sta.c b/drivers/staging/wfx/sta.c
> index 03025ef7f1be..b634c8e004db 100644
> --- a/drivers/staging/wfx/sta.c
> +++ b/drivers/staging/wfx/sta.c
> @@ -132,7 +132,7 @@ void wfx_configure_filter(struct ieee80211_hw *hw, unsigned int changed_flags,
> filter_bssid = true;
>
> /* In AP mode, chip can reply to probe request itself */
> - if (*total_flags & FIF_PROBE_REQ && wvif->vif->type == NL80211_IFTYPE_AP) {
> + if (*total_flags & FIF_PROBE_REQ && wvif_to_vif(wvif)->type == NL80211_IFTYPE_AP) {
> dev_dbg(wdev->dev, "do not forward probe request in AP mode\n");
> *total_flags &= ~FIF_PROBE_REQ;
> }
> @@ -153,18 +153,18 @@ static int wfx_get_ps_timeout(struct wfx_vif *wvif, bool *enable_ps)
> struct ieee80211_channel *chan0 = NULL, *chan1 = NULL;
> struct ieee80211_conf *conf = &wvif->wdev->hw->conf;
>
> - WARN(!wvif->vif->bss_conf.assoc && enable_ps,
> + WARN(!wvif_to_vif(wvif)->bss_conf.assoc && enable_ps,
> "enable_ps is reliable only if associated");
> if (wdev_to_wvif(wvif->wdev, 0))
> - chan0 = wdev_to_wvif(wvif->wdev, 0)->vif->bss_conf.chandef.chan;
> + chan0 = wvif_to_vif(wdev_to_wvif(wvif->wdev, 0))->bss_conf.chandef.chan;
> if (wdev_to_wvif(wvif->wdev, 1))
> - chan1 = wdev_to_wvif(wvif->wdev, 1)->vif->bss_conf.chandef.chan;
> - if (chan0 && chan1 && wvif->vif->type != NL80211_IFTYPE_AP) {
> + chan1 = wvif_to_vif(wdev_to_wvif(wvif->wdev, 1))->bss_conf.chandef.chan;
> + if (chan0 && chan1 && wvif_to_vif(wvif)->type != NL80211_IFTYPE_AP) {
> if (chan0->hw_value == chan1->hw_value) {
> /* It is useless to enable PS if channels are the same. */
> if (enable_ps)
> *enable_ps = false;
> - if (wvif->vif->bss_conf.assoc && wvif->vif->bss_conf.ps)
> + if (wvif_to_vif(wvif)->bss_conf.assoc && wvif_to_vif(wvif)->bss_conf.ps)
> dev_info(wvif->wdev->dev, "ignoring requested PS mode");
> return -1;
> }
> @@ -177,8 +177,8 @@ static int wfx_get_ps_timeout(struct wfx_vif *wvif, bool *enable_ps)
> return 30;
> }
> if (enable_ps)
> - *enable_ps = wvif->vif->bss_conf.ps;
> - if (wvif->vif->bss_conf.assoc && wvif->vif->bss_conf.ps)
> + *enable_ps = wvif_to_vif(wvif)->bss_conf.ps;
> + if (wvif_to_vif(wvif)->bss_conf.assoc && wvif_to_vif(wvif)->bss_conf.ps)
> return conf->dynamic_ps_timeout;
> else
> return -1;
> @@ -189,7 +189,7 @@ int wfx_update_pm(struct wfx_vif *wvif)
> int ps_timeout;
> bool ps;
>
> - if (!wvif->vif->bss_conf.assoc)
> + if (!wvif_to_vif(wvif)->bss_conf.assoc)
> return 0;
> ps_timeout = wfx_get_ps_timeout(wvif, &ps);
> if (!ps)
> @@ -215,7 +215,7 @@ int wfx_conf_tx(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
> mutex_lock(&wdev->conf_mutex);
> assign_bit(queue, &wvif->uapsd_mask, params->uapsd);
> wfx_hif_set_edca_queue_params(wvif, queue, params);
> - if (wvif->vif->type == NL80211_IFTYPE_STATION && old_uapsd != wvif->uapsd_mask) {
> + if (wvif_to_vif(wvif)->type == NL80211_IFTYPE_STATION && old_uapsd != wvif->uapsd_mask) {
> wfx_hif_set_uapsd_info(wvif, wvif->uapsd_mask);
> wfx_update_pm(wvif);
> }
> @@ -242,20 +242,20 @@ void wfx_event_report_rssi(struct wfx_vif *wvif, u8 raw_rcpi_rssi)
> int cqm_evt;
>
> rcpi_rssi = raw_rcpi_rssi / 2 - 110;
> - if (rcpi_rssi <= wvif->vif->bss_conf.cqm_rssi_thold)
> + if (rcpi_rssi <= wvif_to_vif(wvif)->bss_conf.cqm_rssi_thold)
> cqm_evt = NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW;
> else
> cqm_evt = NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH;
> - ieee80211_cqm_rssi_notify(wvif->vif, cqm_evt, rcpi_rssi, GFP_KERNEL);
> + ieee80211_cqm_rssi_notify(wvif_to_vif(wvif), cqm_evt, rcpi_rssi, GFP_KERNEL);
> }
>
> static void wfx_beacon_loss_work(struct work_struct *work)
> {
> struct wfx_vif *wvif = container_of(to_delayed_work(work), struct wfx_vif,
> beacon_loss_work);
> - struct ieee80211_bss_conf *bss_conf = &wvif->vif->bss_conf;
> + struct ieee80211_bss_conf *bss_conf = &wvif_to_vif(wvif)->bss_conf;
>
> - ieee80211_beacon_loss(wvif->vif);
> + ieee80211_beacon_loss(wvif_to_vif(wvif));
> schedule_delayed_work(to_delayed_work(work), msecs_to_jiffies(bss_conf->beacon_int));
> }
>
> @@ -323,13 +323,13 @@ static int wfx_upload_ap_templates(struct wfx_vif *wvif)
> {
> struct sk_buff *skb;
>
> - skb = ieee80211_beacon_get(wvif->wdev->hw, wvif->vif);
> + skb = ieee80211_beacon_get(wvif->wdev->hw, wvif_to_vif(wvif));
> if (!skb)
> return -ENOMEM;
> wfx_hif_set_template_frame(wvif, skb, HIF_TMPLT_BCN, API_RATE_INDEX_B_1MBPS);
> dev_kfree_skb(skb);
>
> - skb = ieee80211_proberesp_get(wvif->wdev->hw, wvif->vif);
> + skb = ieee80211_proberesp_get(wvif->wdev->hw, wvif_to_vif(wvif));
> if (!skb)
> return -ENOMEM;
> wfx_hif_set_template_frame(wvif, skb, HIF_TMPLT_PRBRES, API_RATE_INDEX_B_1MBPS);
> @@ -339,7 +339,7 @@ static int wfx_upload_ap_templates(struct wfx_vif *wvif)
>
> static void wfx_set_mfp_ap(struct wfx_vif *wvif)
> {
> - struct sk_buff *skb = ieee80211_beacon_get(wvif->wdev->hw, wvif->vif);
> + struct sk_buff *skb = ieee80211_beacon_get(wvif->wdev->hw, wvif_to_vif(wvif));
> const int ieoffset = offsetof(struct ieee80211_mgmt, u.beacon.variable);
> const u16 *ptr = (u16 *)cfg80211_find_ie(WLAN_EID_RSN, skb->data + ieoffset,
> skb->len - ieoffset);
> @@ -389,7 +389,7 @@ void wfx_stop_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
> static void wfx_join(struct wfx_vif *wvif)
> {
> int ret;
> - struct ieee80211_bss_conf *conf = &wvif->vif->bss_conf;
> + struct ieee80211_bss_conf *conf = &wvif_to_vif(wvif)->bss_conf;
> struct cfg80211_bss *bss = NULL;
> u8 ssid[IEEE80211_MAX_SSID_LEN];
> const u8 *ssid_ie = NULL;
> @@ -420,7 +420,7 @@ static void wfx_join(struct wfx_vif *wvif)
> wvif->join_in_progress = true;
> ret = wfx_hif_join(wvif, conf, wvif->channel, ssid, ssid_len);
> if (ret) {
> - ieee80211_connection_loss(wvif->vif);
> + ieee80211_connection_loss(wvif_to_vif(wvif));
> wfx_reset(wvif);
> } else {
> /* Due to beacon filtering it is possible that the AP's beacon is not known for the
> @@ -440,7 +440,7 @@ static void wfx_join_finalize(struct wfx_vif *wvif, struct ieee80211_bss_conf *i
>
> rcu_read_lock(); /* protect sta */
> if (info->bssid && !info->ibss_joined)
> - sta = ieee80211_find_sta(wvif->vif, info->bssid);
> + sta = ieee80211_find_sta(wvif_to_vif(wvif), info->bssid);
> if (sta && sta->ht_cap.ht_supported)
> ampdu_density = sta->ht_cap.ampdu_density;
> if (sta && sta->ht_cap.ht_supported &&
> @@ -565,7 +565,7 @@ static int wfx_update_tim(struct wfx_vif *wvif)
> u16 tim_offset, tim_length;
> u8 *tim_ptr;
>
> - skb = ieee80211_beacon_get_tim(wvif->wdev->hw, wvif->vif, &tim_offset, &tim_length);
> + skb = ieee80211_beacon_get_tim(wvif->wdev->hw, wvif_to_vif(wvif), &tim_offset, &tim_length);
> if (!skb)
> return -ENOENT;
> tim_ptr = skb->data + tim_offset;
> @@ -707,8 +707,6 @@ int wfx_add_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
> return -EOPNOTSUPP;
> }
>
> - /* FIXME: prefer use of container_of() to get vif */
> - wvif->vif = vif;
> wvif->wdev = wdev;
>
> wvif->link_id_map = 1; /* link-id 0 is reserved for multicast */
> @@ -767,7 +765,6 @@ void wfx_remove_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
>
> cancel_delayed_work_sync(&wvif->beacon_loss_work);
> wdev->vif[wvif->id] = NULL;
> - wvif->vif = NULL;
>
> mutex_unlock(&wdev->conf_mutex);
>
> diff --git a/drivers/staging/wfx/wfx.h b/drivers/staging/wfx/wfx.h
> index 6594cc647c2f..78f2a416fe4f 100644
> --- a/drivers/staging/wfx/wfx.h
> +++ b/drivers/staging/wfx/wfx.h
> @@ -25,6 +25,8 @@
> #define USEC_PER_TXOP 32 /* see struct ieee80211_tx_queue_params */
> #define USEC_PER_TU 1024
>
> +#define wvif_to_vif(ptr)(container_of((void *)ptr, struct ieee80211_vif, drv_priv))
> +
> struct wfx_hwbus_ops;
>
> struct wfx_dev {
> @@ -61,7 +63,6 @@ struct wfx_dev {
>
> struct wfx_vif {
> struct wfx_dev *wdev;
> - struct ieee80211_vif *vif;
> struct ieee80211_channel *channel;
> int id;
>
> --
> 2.25.1
>
>
>
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