From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 276C0126C18; Wed, 5 Feb 2025 13:49:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738763396; cv=none; b=BtArDhvLTqwVGOFM7U8ZF6MKJZ+wXXTf2ZAgTOIR7RtA2Xz5SLgow3hdLLUl4sNF34FOCn3HgkJW4AujB4/nwIbIvB97JbCPTdGXG2x+RSAp5SWB30oECKler3Yw93oBn4kFGauA4qH54wtSf8PjvoQTIGmX6pG+j4AAx8XiNzQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738763396; c=relaxed/simple; bh=sYAkjZb+djFqN1q8sFx5G+TbrRV7w56wFYpNB9/AdIA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=spqKLBlUHek/+Qce2Y1sIemJgpGtRoY9W4rDyzB8iCJ6446XY9Ue4fhB5v6XO4yMRKpoJ0JzovPqpUfLt/7LtN0lMNVCYqNHY1ejWeJgrrGOFm5/SR10zAb8ceogN55Ki3yEi4iv6NC3AfiYUv3doqwPx/qB00hPGYBggv5kYMs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=EwuqjX35; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="EwuqjX35" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8B7E1C4CED1; Wed, 5 Feb 2025 13:49:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1738763396; bh=sYAkjZb+djFqN1q8sFx5G+TbrRV7w56wFYpNB9/AdIA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EwuqjX350W0Mt0y6iThOGOyW7msHdoaqgjiUk91SgkKL6eMCtnkJKq0BoylEx/PXd axFCc2cQ57UDgPRdXE748L8Ts2xGYPQoOEtYyQlFQSTAotgWM87wFMtuVBFXbkGRpV UYWcYjunssTo7W5mc+WvKE1VN0YnmBut75WZiQn8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Eric Dumazet , =?UTF-8?q?Toke=20H=C3=B8iland-J=C3=B8rgensen?= , Jakub Kicinski , Sasha Levin Subject: [PATCH 6.6 056/393] net_sched: sch_sfq: handle bigger packets Date: Wed, 5 Feb 2025 14:39:35 +0100 Message-ID: <20250205134422.440477024@linuxfoundation.org> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250205134420.279368572@linuxfoundation.org> References: <20250205134420.279368572@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Eric Dumazet [ Upstream commit e4650d7ae4252f67e997a632adfae0dd74d3a99a ] SFQ has an assumption on dealing with packets smaller than 64KB. Even before BIG TCP, TCA_STAB can provide arbitrary big values in qdisc_pkt_len(skb) It is time to switch (struct sfq_slot)->allot to a 32bit field. sizeof(struct sfq_slot) is now 64 bytes, giving better cache locality. Signed-off-by: Eric Dumazet Reviewed-by: Toke Høiland-Jørgensen Link: https://patch.msgid.link/20241008111603.653140-1-edumazet@google.com Signed-off-by: Jakub Kicinski Stable-dep-of: 10685681bafc ("net_sched: sch_sfq: don't allow 1 packet limit") Signed-off-by: Sasha Levin --- net/sched/sch_sfq.c | 39 +++++++++++++-------------------------- 1 file changed, 13 insertions(+), 26 deletions(-) diff --git a/net/sched/sch_sfq.c b/net/sched/sch_sfq.c index ed362eefeea9a..7d4feae2fae36 100644 --- a/net/sched/sch_sfq.c +++ b/net/sched/sch_sfq.c @@ -77,12 +77,6 @@ #define SFQ_EMPTY_SLOT 0xffff #define SFQ_DEFAULT_HASH_DIVISOR 1024 -/* We use 16 bits to store allot, and want to handle packets up to 64K - * Scale allot by 8 (1<<3) so that no overflow occurs. - */ -#define SFQ_ALLOT_SHIFT 3 -#define SFQ_ALLOT_SIZE(X) DIV_ROUND_UP(X, 1 << SFQ_ALLOT_SHIFT) - /* This type should contain at least SFQ_MAX_DEPTH + 1 + SFQ_MAX_FLOWS values */ typedef u16 sfq_index; @@ -104,7 +98,7 @@ struct sfq_slot { sfq_index next; /* next slot in sfq RR chain */ struct sfq_head dep; /* anchor in dep[] chains */ unsigned short hash; /* hash value (index in ht[]) */ - short allot; /* credit for this slot */ + int allot; /* credit for this slot */ unsigned int backlog; struct red_vars vars; @@ -120,7 +114,6 @@ struct sfq_sched_data { siphash_key_t perturbation; u8 cur_depth; /* depth of longest slot */ u8 flags; - unsigned short scaled_quantum; /* SFQ_ALLOT_SIZE(quantum) */ struct tcf_proto __rcu *filter_list; struct tcf_block *block; sfq_index *ht; /* Hash table ('divisor' slots) */ @@ -456,7 +449,7 @@ sfq_enqueue(struct sk_buff *skb, struct Qdisc *sch, struct sk_buff **to_free) */ q->tail = slot; /* We could use a bigger initial quantum for new flows */ - slot->allot = q->scaled_quantum; + slot->allot = q->quantum; } if (++sch->q.qlen <= q->limit) return NET_XMIT_SUCCESS; @@ -493,7 +486,7 @@ sfq_dequeue(struct Qdisc *sch) slot = &q->slots[a]; if (slot->allot <= 0) { q->tail = slot; - slot->allot += q->scaled_quantum; + slot->allot += q->quantum; goto next_slot; } skb = slot_dequeue_head(slot); @@ -512,7 +505,7 @@ sfq_dequeue(struct Qdisc *sch) } q->tail->next = next_a; } else { - slot->allot -= SFQ_ALLOT_SIZE(qdisc_pkt_len(skb)); + slot->allot -= qdisc_pkt_len(skb); } return skb; } @@ -595,7 +588,7 @@ static void sfq_rehash(struct Qdisc *sch) q->tail->next = x; } q->tail = slot; - slot->allot = q->scaled_quantum; + slot->allot = q->quantum; } } sch->q.qlen -= dropped; @@ -628,7 +621,8 @@ static void sfq_perturbation(struct timer_list *t) rcu_read_unlock(); } -static int sfq_change(struct Qdisc *sch, struct nlattr *opt) +static int sfq_change(struct Qdisc *sch, struct nlattr *opt, + struct netlink_ext_ack *extack) { struct sfq_sched_data *q = qdisc_priv(sch); struct tc_sfq_qopt *ctl = nla_data(opt); @@ -646,14 +640,10 @@ static int sfq_change(struct Qdisc *sch, struct nlattr *opt) (!is_power_of_2(ctl->divisor) || ctl->divisor > 65536)) return -EINVAL; - /* slot->allot is a short, make sure quantum is not too big. */ - if (ctl->quantum) { - unsigned int scaled = SFQ_ALLOT_SIZE(ctl->quantum); - - if (scaled <= 0 || scaled > SHRT_MAX) - return -EINVAL; + if ((int)ctl->quantum < 0) { + NL_SET_ERR_MSG_MOD(extack, "invalid quantum"); + return -EINVAL; } - if (ctl_v1 && !red_check_params(ctl_v1->qth_min, ctl_v1->qth_max, ctl_v1->Wlog, ctl_v1->Scell_log, NULL)) return -EINVAL; @@ -663,10 +653,8 @@ static int sfq_change(struct Qdisc *sch, struct nlattr *opt) return -ENOMEM; } sch_tree_lock(sch); - if (ctl->quantum) { + if (ctl->quantum) q->quantum = ctl->quantum; - q->scaled_quantum = SFQ_ALLOT_SIZE(q->quantum); - } WRITE_ONCE(q->perturb_period, ctl->perturb_period * HZ); if (ctl->flows) q->maxflows = min_t(u32, ctl->flows, SFQ_MAX_FLOWS); @@ -762,12 +750,11 @@ static int sfq_init(struct Qdisc *sch, struct nlattr *opt, q->divisor = SFQ_DEFAULT_HASH_DIVISOR; q->maxflows = SFQ_DEFAULT_FLOWS; q->quantum = psched_mtu(qdisc_dev(sch)); - q->scaled_quantum = SFQ_ALLOT_SIZE(q->quantum); q->perturb_period = 0; get_random_bytes(&q->perturbation, sizeof(q->perturbation)); if (opt) { - int err = sfq_change(sch, opt); + int err = sfq_change(sch, opt, extack); if (err) return err; } @@ -878,7 +865,7 @@ static int sfq_dump_class_stats(struct Qdisc *sch, unsigned long cl, if (idx != SFQ_EMPTY_SLOT) { const struct sfq_slot *slot = &q->slots[idx]; - xstats.allot = slot->allot << SFQ_ALLOT_SHIFT; + xstats.allot = slot->allot; qs.qlen = slot->qlen; qs.backlog = slot->backlog; } -- 2.39.5