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Fri, 31 Jul 2026 09:07:15 -0700 (PDT) From: Shivesh To: arend.vanspriel@broadcom.com Cc: linux-wireless@vger.kernel.org, brcm80211@lists.linux.dev, brcm80211-dev-list.pdl@broadcom.com, linux-kernel@vger.kernel.org, Shivesh Subject: [PATCH v4 8/8] wifi: brcmsmac: ampdu: document IEEE 802.11n TID requirement Date: Fri, 31 Jul 2026 16:06:25 +0000 Message-ID: <20260731160646.3812-9-chanelshivesh@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260731160646.3812-1-chanelshivesh@gmail.com> References: <20260731160646.3812-1-chanelshivesh@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit An XXX comment in brcmsmac_ampdu_tx_add() questioned whether it is necessary to reject frames whose QoS priority differs from the current A-MPDU session. IEEE 802.11n (IEEE Std 802.11-2012, section 9.10.1) requires that all MPDUs within an A-MPDU carry the same TID; mixing TIDs would violate the Block ACK agreement and cause receiver-side reassembly failures. The existing behaviour of returning -ENOSPC to close the current aggregate and start a new one is therefore required by the standard. Replace the questioning XXX with a comment referencing the standard. Signed-off-by: Shivesh --- .../wireless/broadcom/brcm80211/brcmfmac/cfg80211.c | 1 - .../net/wireless/broadcom/brcm80211/brcmsmac/ampdu.c | 11 +++++------ 2 files changed, 5 insertions(+), 7 deletions(-) diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c index 2375c2f9d97a..dc4228fb31c1 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c @@ -4464,7 +4464,6 @@ brcmf_pmksa_v2_op(struct brcmf_cfg80211_info *cfg, struct brcmf_if *ifp, return brcmf_fil_iovar_data_set(ifp, "pmkid_info", list, sizeof(*list)); } - static __used s32 brcmf_update_pmklist(struct brcmf_cfg80211_info *cfg, struct brcmf_if *ifp) { diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/ampdu.c b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/ampdu.c index fc7a5dd2e5d8..3fd8bdbd35e5 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/ampdu.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/ampdu.c @@ -516,12 +516,11 @@ int brcms_c_ampdu_add_frame(struct brcms_ampdu_session *session, return -ENOSPC; /* - * We aren't really out of space if the new frame is of - * a different priority, but we want the same behaviour - * so return -ENOSPC anyway. - * - * XXX: The old AMPDU code did this, but is it really - * necessary? + * IEEE 802.11n standard requires that all MPDUs within an + * A-MPDU belong to the same TID (Traffic Identifier). + * Since priority maps to TID, a different priority means + * we must close the current aggregate and start a new one, + * so we return -ENOSPC here. */ first = skb_peek(&session->skb_list); if (p->priority != first->priority) -- 2.53.0