From 0a51826c6e05c5b6cc423b376b81c311e9e485b0 Mon Sep 17 00:00:00 2001 From: Vladimir Oltean Date: Sat, 4 Jan 2020 02:37:09 +0200 Subject: net: dsa: sja1105: Always send through management routes in slot 0 I finally found out how the 4 management route slots are supposed to be used, but.. it's not worth it. The description from the comment I've just deleted in this commit is still true: when more than 1 management slot is active at the same time, the switch will match frames incoming [from the CPU port] on the lowest numbered management slot that matches the frame's DMAC. My issue was that one was not supposed to statically assign each port a slot. Yes, there are 4 slots and also 4 non-CPU ports, but that is a mere coincidence. Instead, the switch can be used like this: every management frame gets a slot at the right of the most recently assigned slot: Send mgmt frame 1 through S0: S0 x x x Send mgmt frame 2 through S1: S0 S1 x x Send mgmt frame 3 through S2: S0 S1 S2 x Send mgmt frame 4 through S3: S0 S1 S2 S3 The difference compared to the old usage is that the transmission of frames 1-4 doesn't need to wait until the completion of the management route. It is safe to use a slot to the right of the most recently used one, because by protocol nobody will program a slot to your left and "steal" your route towards the correct egress port. So there is a potential throughput benefit here. But mgmt frame 5 has no more free slot to use, so it has to wait until _all_ of S0, S1, S2, S3 are full, in order to use S0 again. And that's actually exactly the problem: I was looking for something that would bring more predictable transmission latency, but this is exactly the opposite: 3 out of 4 frames would be transmitted quicker, but the 4th would draw the short straw and have a worse worst-case latency than before. Useless. Things are made even worse by PTP TX timestamping, which is something I won't go deeply into here. Suffice to say that the fact there is a driver-level lock on the SPI bus offsets any potential throughput gains that parallelism might bring. So there's no going back to the multi-slot scheme, remove the "mgmt_slot" variable from sja1105_port and the dummy static assignment made at probe time. While passing by, also remove the assignment to casc_port altogether. Don't pretend that we support cascaded setups. Signed-off-by: Vladimir Oltean Reviewed-by: Florian Fainelli Signed-off-by: David S. Miller --- drivers/net/dsa/sja1105/sja1105_main.c | 26 +------------------------- 1 file changed, 1 insertion(+), 25 deletions(-) (limited to 'drivers/net/dsa/sja1105/sja1105_main.c') diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c index 1da5ac111499..79dd965227bc 100644 --- a/drivers/net/dsa/sja1105/sja1105_main.c +++ b/drivers/net/dsa/sja1105/sja1105_main.c @@ -426,14 +426,6 @@ static int sja1105_init_general_params(struct sja1105_private *priv) .tpid2 = ETH_P_SJA1105, }; struct sja1105_table *table; - int i, k = 0; - - for (i = 0; i < SJA1105_NUM_PORTS; i++) { - if (dsa_is_dsa_port(priv->ds, i)) - default_general_params.casc_port = i; - else if (dsa_is_user_port(priv->ds, i)) - priv->ports[i].mgmt_slot = k++; - } table = &priv->static_config.tables[BLK_IDX_GENERAL_PARAMS]; @@ -1827,30 +1819,14 @@ static netdev_tx_t sja1105_port_deferred_xmit(struct dsa_switch *ds, int port, struct sk_buff *skb) { struct sja1105_private *priv = ds->priv; - struct sja1105_port *sp = &priv->ports[port]; - int slot = sp->mgmt_slot; struct sk_buff *clone; - /* The tragic fact about the switch having 4x2 slots for installing - * management routes is that all of them except one are actually - * useless. - * If 2 slots are simultaneously configured for two BPDUs sent to the - * same (multicast) DMAC but on different egress ports, the switch - * would confuse them and redirect first frame it receives on the CPU - * port towards the port configured on the numerically first slot - * (therefore wrong port), then second received frame on second slot - * (also wrong port). - * So for all practical purposes, there needs to be a lock that - * prevents that from happening. The slot used here is utterly useless - * (could have simply been 0 just as fine), but we are doing it - * nonetheless, in case a smarter idea ever comes up in the future. - */ mutex_lock(&priv->mgmt_lock); /* The clone, if there, was made by dsa_skb_tx_timestamp */ clone = DSA_SKB_CB(skb)->clone; - sja1105_mgmt_xmit(ds, port, slot, skb, !!clone); + sja1105_mgmt_xmit(ds, port, 0, skb, !!clone); if (!clone) goto out; -- cgit v1.2.1 From a68578c20a9667463ee3000402b21644ea62d753 Mon Sep 17 00:00:00 2001 From: Vladimir Oltean Date: Sat, 4 Jan 2020 02:37:10 +0200 Subject: net: dsa: Make deferred_xmit private to sja1105 There are 3 things that are wrong with the DSA deferred xmit mechanism: 1. Its introduction has made the DSA hotpath ever so slightly more inefficient for everybody, since DSA_SKB_CB(skb)->deferred_xmit needs to be initialized to false for every transmitted frame, in order to figure out whether the driver requested deferral or not (a very rare occasion, rare even for the only driver that does use this mechanism: sja1105). That was necessary to avoid kfree_skb from freeing the skb. 2. Because L2 PTP is a link-local protocol like STP, it requires management routes and deferred xmit with this switch. But as opposed to STP, the deferred work mechanism needs to schedule the packet rather quickly for the TX timstamp to be collected in time and sent to user space. But there is no provision for controlling the scheduling priority of this deferred xmit workqueue. Too bad this is a rather specific requirement for a feature that nobody else uses (more below). 3. Perhaps most importantly, it makes the DSA core adhere a bit too much to the NXP company-wide policy "Innovate Where It Doesn't Matter". The sja1105 is probably the only DSA switch that requires some frames sent from the CPU to be routed to the slave port via an out-of-band configuration (register write) rather than in-band (DSA tag). And there are indeed very good reasons to not want to do that: if that out-of-band register is at the other end of a slow bus such as SPI, then you limit that Ethernet flow's throughput to effectively the throughput of the SPI bus. So hardware vendors should definitely not be encouraged to design this way. We do _not_ want more widespread use of this mechanism. Luckily we have a solution for each of the 3 issues: For 1, we can just remove that variable in the skb->cb and counteract the effect of kfree_skb with skb_get, much to the same effect. The advantage, of course, being that anybody who doesn't use deferred xmit doesn't need to do any extra operation in the hotpath. For 2, we can create a kernel thread for each port's deferred xmit work. If the user switch ports are named swp0, swp1, swp2, the kernel threads will be named swp0_xmit, swp1_xmit, swp2_xmit (there appears to be a 15 character length limit on kernel thread names). With this, the user can change the scheduling priority with chrt $(pidof swp2_xmit). For 3, we can actually move the entire implementation to the sja1105 driver. So this patch deletes the generic implementation from the DSA core and adds a new one, more adequate to the requirements of PTP TX timestamping, in sja1105_main.c. Suggested-by: Florian Fainelli Signed-off-by: Vladimir Oltean Reviewed-by: Florian Fainelli Signed-off-by: David S. Miller --- drivers/net/dsa/sja1105/sja1105_main.c | 96 ++++++++++++++++++++++++++-------- 1 file changed, 75 insertions(+), 21 deletions(-) (limited to 'drivers/net/dsa/sja1105/sja1105_main.c') diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c index 79dd965227bc..61795833c8f5 100644 --- a/drivers/net/dsa/sja1105/sja1105_main.c +++ b/drivers/net/dsa/sja1105/sja1105_main.c @@ -1732,6 +1732,16 @@ static int sja1105_setup(struct dsa_switch *ds) static void sja1105_teardown(struct dsa_switch *ds) { struct sja1105_private *priv = ds->priv; + int port; + + for (port = 0; port < SJA1105_NUM_PORTS; port++) { + struct sja1105_port *sp = &priv->ports[port]; + + if (!dsa_is_user_port(ds, port)) + continue; + + kthread_destroy_worker(sp->xmit_worker); + } sja1105_tas_teardown(ds); sja1105_ptp_clock_unregister(ds); @@ -1753,6 +1763,18 @@ static int sja1105_port_enable(struct dsa_switch *ds, int port, return 0; } +static void sja1105_port_disable(struct dsa_switch *ds, int port) +{ + struct sja1105_private *priv = ds->priv; + struct sja1105_port *sp = &priv->ports[port]; + + if (!dsa_is_user_port(ds, port)) + return; + + kthread_cancel_work_sync(&sp->xmit_work); + skb_queue_purge(&sp->xmit_queue); +} + static int sja1105_mgmt_xmit(struct dsa_switch *ds, int port, int slot, struct sk_buff *skb, bool takets) { @@ -1811,31 +1833,36 @@ static int sja1105_mgmt_xmit(struct dsa_switch *ds, int port, int slot, return NETDEV_TX_OK; } +#define work_to_port(work) \ + container_of((work), struct sja1105_port, xmit_work) +#define tagger_to_sja1105(t) \ + container_of((t), struct sja1105_private, tagger_data) + /* Deferred work is unfortunately necessary because setting up the management * route cannot be done from atomit context (SPI transfer takes a sleepable * lock on the bus) */ -static netdev_tx_t sja1105_port_deferred_xmit(struct dsa_switch *ds, int port, - struct sk_buff *skb) +static void sja1105_port_deferred_xmit(struct kthread_work *work) { - struct sja1105_private *priv = ds->priv; - struct sk_buff *clone; - - mutex_lock(&priv->mgmt_lock); + struct sja1105_port *sp = work_to_port(work); + struct sja1105_tagger_data *tagger_data = sp->data; + struct sja1105_private *priv = tagger_to_sja1105(tagger_data); + int port = sp - priv->ports; + struct sk_buff *skb; - /* The clone, if there, was made by dsa_skb_tx_timestamp */ - clone = DSA_SKB_CB(skb)->clone; + while ((skb = skb_dequeue(&sp->xmit_queue)) != NULL) { + struct sk_buff *clone = DSA_SKB_CB(skb)->clone; - sja1105_mgmt_xmit(ds, port, 0, skb, !!clone); + mutex_lock(&priv->mgmt_lock); - if (!clone) - goto out; + sja1105_mgmt_xmit(priv->ds, port, 0, skb, !!clone); - sja1105_ptp_txtstamp_skb(ds, port, clone); + /* The clone, if there, was made by dsa_skb_tx_timestamp */ + if (clone) + sja1105_ptp_txtstamp_skb(priv->ds, port, clone); -out: - mutex_unlock(&priv->mgmt_lock); - return NETDEV_TX_OK; + mutex_unlock(&priv->mgmt_lock); + } } /* The MAXAGE setting belongs to the L2 Forwarding Parameters table, @@ -1966,6 +1993,7 @@ static const struct dsa_switch_ops sja1105_switch_ops = { .get_sset_count = sja1105_get_sset_count, .get_ts_info = sja1105_get_ts_info, .port_enable = sja1105_port_enable, + .port_disable = sja1105_port_disable, .port_fdb_dump = sja1105_fdb_dump, .port_fdb_add = sja1105_fdb_add, .port_fdb_del = sja1105_fdb_del, @@ -1979,7 +2007,6 @@ static const struct dsa_switch_ops sja1105_switch_ops = { .port_mdb_prepare = sja1105_mdb_prepare, .port_mdb_add = sja1105_mdb_add, .port_mdb_del = sja1105_mdb_del, - .port_deferred_xmit = sja1105_port_deferred_xmit, .port_hwtstamp_get = sja1105_hwtstamp_get, .port_hwtstamp_set = sja1105_hwtstamp_set, .port_rxtstamp = sja1105_port_rxtstamp, @@ -2031,7 +2058,7 @@ static int sja1105_probe(struct spi_device *spi) struct device *dev = &spi->dev; struct sja1105_private *priv; struct dsa_switch *ds; - int rc, i; + int rc, port; if (!dev->of_node) { dev_err(dev, "No DTS bindings for SJA1105 driver\n"); @@ -2096,15 +2123,42 @@ static int sja1105_probe(struct spi_device *spi) return rc; /* Connections between dsa_port and sja1105_port */ - for (i = 0; i < SJA1105_NUM_PORTS; i++) { - struct sja1105_port *sp = &priv->ports[i]; + for (port = 0; port < SJA1105_NUM_PORTS; port++) { + struct sja1105_port *sp = &priv->ports[port]; + struct dsa_port *dp = dsa_to_port(ds, port); + struct net_device *slave; + + if (!dsa_is_user_port(ds, port)) + continue; - dsa_to_port(ds, i)->priv = sp; - sp->dp = dsa_to_port(ds, i); + dp->priv = sp; + sp->dp = dp; sp->data = tagger_data; + slave = dp->slave; + kthread_init_work(&sp->xmit_work, sja1105_port_deferred_xmit); + sp->xmit_worker = kthread_create_worker(0, "%s_xmit", + slave->name); + if (IS_ERR(sp->xmit_worker)) { + rc = PTR_ERR(sp->xmit_worker); + dev_err(ds->dev, + "failed to create deferred xmit thread: %d\n", + rc); + goto out; + } + skb_queue_head_init(&sp->xmit_queue); } return 0; +out: + while (port-- > 0) { + struct sja1105_port *sp = &priv->ports[port]; + + if (!dsa_is_user_port(ds, port)) + continue; + + kthread_destroy_worker(sp->xmit_worker); + } + return rc; } static int sja1105_remove(struct spi_device *spi) -- cgit v1.2.1 From 4d776482ecc689bdd68627985ac4cb5a6f325953 Mon Sep 17 00:00:00 2001 From: Florian Fainelli Date: Tue, 7 Jan 2020 21:06:05 -0800 Subject: net: dsa: Get information about stacked DSA protocol It is possible to stack multiple DSA switches in a way that they are not part of the tree (disjoint) but the DSA master of a switch is a DSA slave of another. When that happens switch drivers may have to know this is the case so as to determine whether their tagging protocol has a remove chance of working. This is useful for specific switch drivers such as b53 where devices have been known to be stacked in the wild without the Broadcom tag protocol supporting that feature. This allows b53 to continue supporting those devices by forcing the disabling of Broadcom tags on the outermost switches if necessary. The get_tag_protocol() function is therefore updated to gain an additional enum dsa_tag_protocol argument which denotes the current tagging protocol used by the DSA master we are attached to, else DSA_TAG_PROTO_NONE for the top of the dsa_switch_tree. Signed-off-by: Florian Fainelli Signed-off-by: David S. Miller --- drivers/net/dsa/sja1105/sja1105_main.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/net/dsa/sja1105/sja1105_main.c') diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c index 61795833c8f5..784e6b8166a0 100644 --- a/drivers/net/dsa/sja1105/sja1105_main.c +++ b/drivers/net/dsa/sja1105/sja1105_main.c @@ -1534,7 +1534,8 @@ static int sja1105_setup_8021q_tagging(struct dsa_switch *ds, bool enabled) } static enum dsa_tag_protocol -sja1105_get_tag_protocol(struct dsa_switch *ds, int port) +sja1105_get_tag_protocol(struct dsa_switch *ds, int port, + enum dsa_tag_protocol mp) { return DSA_TAG_PROTO_SJA1105; } -- cgit v1.2.1