mac80211: brcmfmac: fix support for up to 4 AP interfaces

[openwrt.git] / package / kernel / mac80211 / patches / 351-0005-brcmfmac-rework-function-picking-free-BSS-index.patch

diff --git a/package/kernel/mac80211/patches/351-0005-brcmfmac-rework-function-picking-free-BSS-index.patch b/package/kernel/mac80211/patches/351-0005-brcmfmac-rework-function-picking-free-BSS-index.patch
new file mode 100644 (file)
index 0000000..c602f22
--- /dev/null
+++ b/package/kernel/mac80211/patches/351-0005-brcmfmac-rework-function-picking-free-BSS-index.patch
@@ -0,0 +1,119 @@
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
+Date: Thu, 26 May 2016 01:44:27 +0200
+Subject: [PATCH] brcmfmac: rework function picking free BSS index
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+The old implementation was overcomplicated and slightly bugged in some
+corner cases.
+
+Consider following state of BSS-es (limited to 6 for simplification):
+drvr->iflist[0]: { bsscfgidx:0, ndev->name:wlan1, }
+drvr->iflist[1]:  (null)
+drvr->iflist[2]: { bsscfgidx:2, ndev->name:wlan1-1, }
+drvr->iflist[3]: { bsscfgidx:3, ndev->name:wlan1-2, }
+drvr->iflist[4]:  (null)
+drvr->iflist[5]:  (null)
+In such case the next AP interface should bsscfgidx 4 (we don't use 1 as
+it's reserved for P2P).
+
+With old code the loop iterations were following:
+[ifidx = 0] [bsscfgidx = 2] [highest = 2]
+[ifidx = 1] [bsscfgidx = 2] [highest = 2] available = true
+[ifidx = 2] [bsscfgidx = 2] [highest = 2] bsscfgidx = highest + 1
+[ifidx = 3] [bsscfgidx = 3] [highest = 2] bsscfgidx = highest + 1
+[ifidx = 4] [bsscfgidx = 3] [highest = 2] available = true
+[ifidx = 5] [bsscfgidx = 3] [highest = 2] available = true
+There were 2 obvious problems:
+1) Having empty BSS at index 1 was resulting in available being always
+   set to true, even if we would run out of BSS-es.
+2) Calculated bsscfgidx was invalid (3 instead of 4) resulting in driver
+   not being able to create the 4th AP interface.
+
+New code is simpler, placed in file where it's really used, handles
+running out of free BSS-es and allows using 4 interfaces at the same
+time. It also looks for the first free BSS instead of one after the last
+in use. It works well with current driver (which doesn't allow deleting
+interfaces) and should be future proof (if we ever allow deleting).
+
+Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
+Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
+---
+
+--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
++++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
+@@ -527,6 +527,21 @@ brcmf_cfg80211_update_proto_addr_mode(st
+                                               ADDR_INDIRECT);
+ }
+ 
++static int brcmf_get_first_free_bsscfgidx(struct brcmf_pub *drvr)
++{
++      int bsscfgidx;
++
++      for (bsscfgidx = 0; bsscfgidx < BRCMF_MAX_IFS; bsscfgidx++) {
++              /* bsscfgidx 1 is reserved for legacy P2P */
++              if (bsscfgidx == 1)
++                      continue;
++              if (!drvr->iflist[bsscfgidx])
++                      return bsscfgidx;
++      }
++
++      return -ENOMEM;
++}
++
+ static int brcmf_cfg80211_request_ap_if(struct brcmf_if *ifp)
+ {
+       struct brcmf_mbss_ssid_le mbss_ssid_le;
+@@ -534,7 +549,7 @@ static int brcmf_cfg80211_request_ap_if(
+       int err;
+ 
+       memset(&mbss_ssid_le, 0, sizeof(mbss_ssid_le));
+-      bsscfgidx = brcmf_get_next_free_bsscfgidx(ifp->drvr);
++      bsscfgidx = brcmf_get_first_free_bsscfgidx(ifp->drvr);
+       if (bsscfgidx < 0)
+               return bsscfgidx;
+ 
+--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
++++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
+@@ -753,30 +753,6 @@ void brcmf_remove_interface(struct brcmf
+       brcmf_del_if(ifp->drvr, ifp->bsscfgidx);
+ }
+ 
+-int brcmf_get_next_free_bsscfgidx(struct brcmf_pub *drvr)
+-{
+-      int ifidx;
+-      int bsscfgidx;
+-      bool available;
+-      int highest;
+-
+-      available = false;
+-      bsscfgidx = 2;
+-      highest = 2;
+-      for (ifidx = 0; ifidx < BRCMF_MAX_IFS; ifidx++) {
+-              if (drvr->iflist[ifidx]) {
+-                      if (drvr->iflist[ifidx]->bsscfgidx == bsscfgidx)
+-                              bsscfgidx = highest + 1;
+-                      else if (drvr->iflist[ifidx]->bsscfgidx > highest)
+-                              highest = drvr->iflist[ifidx]->bsscfgidx;
+-              } else {
+-                      available = true;
+-              }
+-      }
+-
+-      return available ? bsscfgidx : -ENOMEM;
+-}
+-
+ #ifdef CONFIG_INET
+ #define ARPOL_MAX_ENTRIES     8
+ static int brcmf_inetaddr_changed(struct notifier_block *nb,
+--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.h
++++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.h
+@@ -217,7 +217,6 @@ int brcmf_net_attach(struct brcmf_if *if
+ struct brcmf_if *brcmf_add_if(struct brcmf_pub *drvr, s32 bsscfgidx, s32 ifidx,
+                             bool is_p2pdev, char *name, u8 *mac_addr);
+ void brcmf_remove_interface(struct brcmf_if *ifp);
+-int brcmf_get_next_free_bsscfgidx(struct brcmf_pub *drvr);
+ void brcmf_txflowblock_if(struct brcmf_if *ifp,
+                         enum brcmf_netif_stop_reason reason, bool state);
+ void brcmf_txfinalize(struct brcmf_if *ifp, struct sk_buff *txp, bool success);