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Date: Thu, 2 Jul 2020 17:29:58 +0100
From: Edward Cree <ecree@...arflare.com>
To: <linux-net-drivers@...arflare.com>, <davem@...emloft.net>
CC: <netdev@...r.kernel.org>
Subject: [PATCH v2 net-next 07/16] sfc: assign TXQs without gaps
Since we only allocate VIs for the number of TXQs we actually need, we
cannot naively use "channel * TXQ_TYPES + txq" for the TXQ number, as
this has gaps (when efx->tx_queues_per_channel < EFX_TXQ_TYPES) and
thus overruns the driver's VI allocations, causing the firmware to
reject the MC_CMD_INIT_TXQ based on INSTANCE.
Thus, we distinguish INSTANCE (stored in tx_queue->queue) from LABEL
(tx_queue->label); the former is allocated starting from 0 in
efx_set_channels(), while the latter is simply the txq type (index in
channel->tx_queue array).
To simplify things, rather than changing tx_queues_per_channel after
setting up TXQs, make Siena always probe its HIGHPRI queues at start
of day, rather than deferring it until tc mqprio enables them.
Signed-off-by: Edward Cree <ecree@...arflare.com>
---
drivers/net/ethernet/sfc/ef10.c | 2 +-
drivers/net/ethernet/sfc/efx_channels.c | 38 ++++++++++++++-----
drivers/net/ethernet/sfc/ethtool_common.c | 7 ++--
drivers/net/ethernet/sfc/farch.c | 6 +--
drivers/net/ethernet/sfc/mcdi_functions.c | 4 +-
drivers/net/ethernet/sfc/net_driver.h | 5 ++-
drivers/net/ethernet/sfc/nic_common.h | 2 +-
drivers/net/ethernet/sfc/selftest.c | 18 ++++-----
drivers/net/ethernet/sfc/siena.c | 2 +-
drivers/net/ethernet/sfc/tx.c | 46 +++--------------------
10 files changed, 58 insertions(+), 72 deletions(-)
diff --git a/drivers/net/ethernet/sfc/ef10.c b/drivers/net/ethernet/sfc/ef10.c
index be15640c160a..311a2d2a906d 100644
--- a/drivers/net/ethernet/sfc/ef10.c
+++ b/drivers/net/ethernet/sfc/ef10.c
@@ -2244,7 +2244,7 @@ static u32 efx_ef10_tso_versions(struct efx_nic *efx)
static void efx_ef10_tx_init(struct efx_tx_queue *tx_queue)
{
- bool csum_offload = tx_queue->queue & EFX_TXQ_TYPE_OFFLOAD;
+ bool csum_offload = tx_queue->label & EFX_TXQ_TYPE_OFFLOAD;
struct efx_channel *channel = tx_queue->channel;
struct efx_nic *efx = tx_queue->efx;
struct efx_ef10_nic_data *nic_data;
diff --git a/drivers/net/ethernet/sfc/efx_channels.c b/drivers/net/ethernet/sfc/efx_channels.c
index 30358f3f48ca..dd4f30ea48a8 100644
--- a/drivers/net/ethernet/sfc/efx_channels.c
+++ b/drivers/net/ethernet/sfc/efx_channels.c
@@ -524,7 +524,8 @@ efx_alloc_channel(struct efx_nic *efx, int i, struct efx_channel *old_channel)
for (j = 0; j < EFX_TXQ_TYPES; j++) {
tx_queue = &channel->tx_queue[j];
tx_queue->efx = efx;
- tx_queue->queue = i * EFX_TXQ_TYPES + j;
+ tx_queue->queue = -1;
+ tx_queue->label = j;
tx_queue->channel = channel;
}
@@ -853,8 +854,9 @@ int efx_realloc_channels(struct efx_nic *efx, u32 rxq_entries, u32 txq_entries)
int efx_set_channels(struct efx_nic *efx)
{
- struct efx_channel *channel;
struct efx_tx_queue *tx_queue;
+ struct efx_channel *channel;
+ unsigned int next_queue = 0;
int xdp_queue_number;
int rc;
@@ -884,14 +886,30 @@ int efx_set_channels(struct efx_nic *efx)
else
channel->rx_queue.core_index = -1;
- efx_for_each_channel_tx_queue(tx_queue, channel) {
- tx_queue->queue -= (efx->tx_channel_offset *
- EFX_TXQ_TYPES);
-
- if (efx_channel_is_xdp_tx(channel) &&
- xdp_queue_number < efx->xdp_tx_queue_count) {
- efx->xdp_tx_queues[xdp_queue_number] = tx_queue;
- xdp_queue_number++;
+ if (channel->channel >= efx->tx_channel_offset) {
+ if (efx_channel_is_xdp_tx(channel)) {
+ efx_for_each_channel_tx_queue(tx_queue, channel) {
+ tx_queue->queue = next_queue++;
+ netif_dbg(efx, drv, efx->net_dev, "Channel %u TXQ %u is XDP %u, HW %u\n",
+ channel->channel, tx_queue->label,
+ xdp_queue_number, tx_queue->queue);
+ /* We may have a few left-over XDP TX
+ * queues owing to xdp_tx_queue_count
+ * not dividing evenly by EFX_TXQ_TYPES.
+ * We still allocate and probe those
+ * TXQs, but never use them.
+ */
+ if (xdp_queue_number < efx->xdp_tx_queue_count)
+ efx->xdp_tx_queues[xdp_queue_number] = tx_queue;
+ xdp_queue_number++;
+ }
+ } else {
+ efx_for_each_channel_tx_queue(tx_queue, channel) {
+ tx_queue->queue = next_queue++;
+ netif_dbg(efx, drv, efx->net_dev, "Channel %u TXQ %u is HW %u\n",
+ channel->channel, tx_queue->label,
+ tx_queue->queue);
+ }
}
}
}
diff --git a/drivers/net/ethernet/sfc/ethtool_common.c b/drivers/net/ethernet/sfc/ethtool_common.c
index 738d9be86899..37a4409e759e 100644
--- a/drivers/net/ethernet/sfc/ethtool_common.c
+++ b/drivers/net/ethernet/sfc/ethtool_common.c
@@ -287,8 +287,7 @@ static void efx_fill_test(unsigned int test_index, u8 *strings, u64 *data,
}
#define EFX_CHANNEL_NAME(_channel) "chan%d", _channel->channel
-#define EFX_TX_QUEUE_NAME(_tx_queue) "txq%d", _tx_queue->queue
-#define EFX_RX_QUEUE_NAME(_rx_queue) "rxq%d", _rx_queue->queue
+#define EFX_TX_QUEUE_NAME(_tx_queue) "txq%d", _tx_queue->label
#define EFX_LOOPBACK_NAME(_mode, _counter) \
"loopback.%s." _counter, STRING_TABLE_LOOKUP(_mode, efx_loopback_mode)
@@ -316,11 +315,11 @@ static int efx_fill_loopback_test(struct efx_nic *efx,
efx_for_each_channel_tx_queue(tx_queue, channel) {
efx_fill_test(test_index++, strings, data,
- &lb_tests->tx_sent[tx_queue->queue],
+ &lb_tests->tx_sent[tx_queue->label],
EFX_TX_QUEUE_NAME(tx_queue),
EFX_LOOPBACK_NAME(mode, "tx_sent"));
efx_fill_test(test_index++, strings, data,
- &lb_tests->tx_done[tx_queue->queue],
+ &lb_tests->tx_done[tx_queue->label],
EFX_TX_QUEUE_NAME(tx_queue),
EFX_LOOPBACK_NAME(mode, "tx_done"));
}
diff --git a/drivers/net/ethernet/sfc/farch.c b/drivers/net/ethernet/sfc/farch.c
index dbbb898adddb..d07eeaad9bdf 100644
--- a/drivers/net/ethernet/sfc/farch.c
+++ b/drivers/net/ethernet/sfc/farch.c
@@ -379,7 +379,7 @@ int efx_farch_tx_probe(struct efx_tx_queue *tx_queue)
void efx_farch_tx_init(struct efx_tx_queue *tx_queue)
{
- int csum = tx_queue->queue & EFX_TXQ_TYPE_OFFLOAD;
+ int csum = tx_queue->label & EFX_TXQ_TYPE_OFFLOAD;
struct efx_nic *efx = tx_queue->efx;
efx_oword_t reg;
@@ -395,7 +395,7 @@ void efx_farch_tx_init(struct efx_tx_queue *tx_queue)
FRF_AZ_TX_DESCQ_EVQ_ID,
tx_queue->channel->channel,
FRF_AZ_TX_DESCQ_OWNER_ID, 0,
- FRF_AZ_TX_DESCQ_LABEL, tx_queue->queue,
+ FRF_AZ_TX_DESCQ_LABEL, tx_queue->label,
FRF_AZ_TX_DESCQ_SIZE,
__ffs(tx_queue->txd.entries),
FRF_AZ_TX_DESCQ_TYPE, 0,
@@ -409,7 +409,7 @@ void efx_farch_tx_init(struct efx_tx_queue *tx_queue)
EFX_POPULATE_OWORD_1(reg,
FRF_BZ_TX_PACE,
- (tx_queue->queue & EFX_TXQ_TYPE_HIGHPRI) ?
+ (tx_queue->label & EFX_TXQ_TYPE_HIGHPRI) ?
FFE_BZ_TX_PACE_OFF :
FFE_BZ_TX_PACE_RESERVED);
efx_writeo_table(efx, ®, FR_BZ_TX_PACE_TBL, tx_queue->queue);
diff --git a/drivers/net/ethernet/sfc/mcdi_functions.c b/drivers/net/ethernet/sfc/mcdi_functions.c
index 962d8395d958..b3a8aa88db06 100644
--- a/drivers/net/ethernet/sfc/mcdi_functions.c
+++ b/drivers/net/ethernet/sfc/mcdi_functions.c
@@ -164,7 +164,7 @@ int efx_mcdi_tx_init(struct efx_tx_queue *tx_queue, bool tso_v2)
{
MCDI_DECLARE_BUF(inbuf, MC_CMD_INIT_TXQ_IN_LEN(EFX_MAX_DMAQ_SIZE * 8 /
EFX_BUF_SIZE));
- bool csum_offload = tx_queue->queue & EFX_TXQ_TYPE_OFFLOAD;
+ bool csum_offload = tx_queue->label & EFX_TXQ_TYPE_OFFLOAD;
size_t entries = tx_queue->txd.buf.len / EFX_BUF_SIZE;
struct efx_channel *channel = tx_queue->channel;
struct efx_nic *efx = tx_queue->efx;
@@ -176,7 +176,7 @@ int efx_mcdi_tx_init(struct efx_tx_queue *tx_queue, bool tso_v2)
MCDI_SET_DWORD(inbuf, INIT_TXQ_IN_SIZE, tx_queue->ptr_mask + 1);
MCDI_SET_DWORD(inbuf, INIT_TXQ_IN_TARGET_EVQ, channel->channel);
- MCDI_SET_DWORD(inbuf, INIT_TXQ_IN_LABEL, tx_queue->queue);
+ MCDI_SET_DWORD(inbuf, INIT_TXQ_IN_LABEL, tx_queue->label);
MCDI_SET_DWORD(inbuf, INIT_TXQ_IN_INSTANCE, tx_queue->queue);
MCDI_SET_DWORD(inbuf, INIT_TXQ_IN_OWNER_ID, 0);
MCDI_SET_DWORD(inbuf, INIT_TXQ_IN_PORT_ID, efx->vport_id);
diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h
index 4ded155b12e9..0bf11ebb03cf 100644
--- a/drivers/net/ethernet/sfc/net_driver.h
+++ b/drivers/net/ethernet/sfc/net_driver.h
@@ -189,6 +189,8 @@ struct efx_tx_buffer {
*
* @efx: The associated Efx NIC
* @queue: DMA queue number
+ * @label: Label for TX completion events.
+ * Is our index within @channel->tx_queue array.
* @tso_version: Version of TSO in use for this queue.
* @channel: The associated channel
* @core_txq: The networking core TX queue structure
@@ -250,7 +252,8 @@ struct efx_tx_buffer {
struct efx_tx_queue {
/* Members which don't change on the fast path */
struct efx_nic *efx ____cacheline_aligned_in_smp;
- unsigned queue;
+ unsigned int queue;
+ unsigned int label;
unsigned int tso_version;
struct efx_channel *channel;
struct netdev_queue *core_txq;
diff --git a/drivers/net/ethernet/sfc/nic_common.h b/drivers/net/ethernet/sfc/nic_common.h
index fd474d9e55e4..813f288ab3fe 100644
--- a/drivers/net/ethernet/sfc/nic_common.h
+++ b/drivers/net/ethernet/sfc/nic_common.h
@@ -90,7 +90,7 @@ static inline bool efx_nic_tx_is_empty(struct efx_tx_queue *tx_queue)
/* XXX is this a thing on EF100? */
static inline struct efx_tx_queue *efx_tx_queue_partner(struct efx_tx_queue *tx_queue)
{
- if (tx_queue->queue & EFX_TXQ_TYPE_OFFLOAD)
+ if (tx_queue->label & EFX_TXQ_TYPE_OFFLOAD)
return tx_queue - EFX_TXQ_TYPE_OFFLOAD;
else
return tx_queue + EFX_TXQ_TYPE_OFFLOAD;
diff --git a/drivers/net/ethernet/sfc/selftest.c b/drivers/net/ethernet/sfc/selftest.c
index 1ae369022d7d..e71d6d37a317 100644
--- a/drivers/net/ethernet/sfc/selftest.c
+++ b/drivers/net/ethernet/sfc/selftest.c
@@ -445,7 +445,7 @@ static int efx_begin_loopback(struct efx_tx_queue *tx_queue)
if (rc != NETDEV_TX_OK) {
netif_err(efx, drv, efx->net_dev,
"TX queue %d could not transmit packet %d of "
- "%d in %s loopback test\n", tx_queue->queue,
+ "%d in %s loopback test\n", tx_queue->label,
i + 1, state->packet_count,
LOOPBACK_MODE(efx));
@@ -497,7 +497,7 @@ static int efx_end_loopback(struct efx_tx_queue *tx_queue,
netif_err(efx, drv, efx->net_dev,
"TX queue %d saw only %d out of an expected %d "
"TX completion events in %s loopback test\n",
- tx_queue->queue, tx_done, state->packet_count,
+ tx_queue->label, tx_done, state->packet_count,
LOOPBACK_MODE(efx));
rc = -ETIMEDOUT;
/* Allow to fall through so we see the RX errors as well */
@@ -508,15 +508,15 @@ static int efx_end_loopback(struct efx_tx_queue *tx_queue,
netif_dbg(efx, drv, efx->net_dev,
"TX queue %d saw only %d out of an expected %d "
"received packets in %s loopback test\n",
- tx_queue->queue, rx_good, state->packet_count,
+ tx_queue->label, rx_good, state->packet_count,
LOOPBACK_MODE(efx));
rc = -ETIMEDOUT;
/* Fall through */
}
/* Update loopback test structure */
- lb_tests->tx_sent[tx_queue->queue] += state->packet_count;
- lb_tests->tx_done[tx_queue->queue] += tx_done;
+ lb_tests->tx_sent[tx_queue->label] += state->packet_count;
+ lb_tests->tx_done[tx_queue->label] += tx_done;
lb_tests->rx_good += rx_good;
lb_tests->rx_bad += rx_bad;
@@ -542,8 +542,8 @@ efx_test_loopback(struct efx_tx_queue *tx_queue,
state->flush = false;
netif_dbg(efx, drv, efx->net_dev,
- "TX queue %d testing %s loopback with %d packets\n",
- tx_queue->queue, LOOPBACK_MODE(efx),
+ "TX queue %d (hw %d) testing %s loopback with %d packets\n",
+ tx_queue->label, tx_queue->queue, LOOPBACK_MODE(efx),
state->packet_count);
efx_iterate_state(efx);
@@ -570,7 +570,7 @@ efx_test_loopback(struct efx_tx_queue *tx_queue,
netif_dbg(efx, drv, efx->net_dev,
"TX queue %d passed %s loopback test with a burst length "
- "of %d packets\n", tx_queue->queue, LOOPBACK_MODE(efx),
+ "of %d packets\n", tx_queue->label, LOOPBACK_MODE(efx),
state->packet_count);
return 0;
@@ -660,7 +660,7 @@ static int efx_test_loopbacks(struct efx_nic *efx, struct efx_self_tests *tests,
/* Test all enabled types of TX queue */
efx_for_each_channel_tx_queue(tx_queue, channel) {
- state->offload_csum = (tx_queue->queue &
+ state->offload_csum = (tx_queue->label &
EFX_TXQ_TYPE_OFFLOAD);
rc = efx_test_loopback(tx_queue,
&tests->loopback[mode]);
diff --git a/drivers/net/ethernet/sfc/siena.c b/drivers/net/ethernet/sfc/siena.c
index 4c5881a3bfe4..219fb3a0c9d0 100644
--- a/drivers/net/ethernet/sfc/siena.c
+++ b/drivers/net/ethernet/sfc/siena.c
@@ -279,7 +279,7 @@ static int siena_probe_nic(struct efx_nic *efx)
efx->max_channels = EFX_MAX_CHANNELS;
efx->max_vis = EFX_MAX_CHANNELS;
efx->max_tx_channels = EFX_MAX_CHANNELS;
- efx->tx_queues_per_channel = 2;
+ efx->tx_queues_per_channel = 4;
efx_reado(efx, ®, FR_AZ_CS_DEBUG);
efx->port_num = EFX_OWORD_FIELD(reg, FRF_CZ_CS_PORT_NUM) - 1;
diff --git a/drivers/net/ethernet/sfc/tx.c b/drivers/net/ethernet/sfc/tx.c
index 76ff394f5b58..1bcf50ab95d9 100644
--- a/drivers/net/ethernet/sfc/tx.c
+++ b/drivers/net/ethernet/sfc/tx.c
@@ -551,8 +551,8 @@ void efx_init_tx_queue_core_txq(struct efx_tx_queue *tx_queue)
/* Must be inverse of queue lookup in efx_hard_start_xmit() */
tx_queue->core_txq =
netdev_get_tx_queue(efx->net_dev,
- tx_queue->queue / EFX_TXQ_TYPES +
- ((tx_queue->queue & EFX_TXQ_TYPE_HIGHPRI) ?
+ tx_queue->channel->channel +
+ ((tx_queue->label & EFX_TXQ_TYPE_HIGHPRI) ?
efx->n_tx_channels : 0));
}
@@ -561,10 +561,7 @@ int efx_setup_tc(struct net_device *net_dev, enum tc_setup_type type,
{
struct efx_nic *efx = netdev_priv(net_dev);
struct tc_mqprio_qopt *mqprio = type_data;
- struct efx_channel *channel;
- struct efx_tx_queue *tx_queue;
unsigned tc, num_tc;
- int rc;
if (type != TC_SETUP_QDISC_MQPRIO)
return -EOPNOTSUPP;
@@ -588,40 +585,9 @@ int efx_setup_tc(struct net_device *net_dev, enum tc_setup_type type,
net_dev->tc_to_txq[tc].count = efx->n_tx_channels;
}
- if (num_tc > net_dev->num_tc) {
- efx->tx_queues_per_channel = 4;
- /* Initialise high-priority queues as necessary */
- efx_for_each_channel(channel, efx) {
- efx_for_each_channel_tx_queue(tx_queue, channel) {
- if (!(tx_queue->queue & EFX_TXQ_TYPE_HIGHPRI))
- continue;
- if (!tx_queue->buffer) {
- rc = efx_probe_tx_queue(tx_queue);
- if (rc)
- return rc;
- }
- if (!tx_queue->initialised)
- efx_init_tx_queue(tx_queue);
- efx_init_tx_queue_core_txq(tx_queue);
- }
- }
- } else {
- /* Reduce number of classes before number of queues */
- net_dev->num_tc = num_tc;
- }
-
- rc = netif_set_real_num_tx_queues(net_dev,
- max_t(int, num_tc, 1) *
- efx->n_tx_channels);
- if (rc)
- return rc;
-
- /* Do not destroy high-priority queues when they become
- * unused. We would have to flush them first, and it is
- * fairly difficult to flush a subset of TX queues. Leave
- * it to efx_fini_channels().
- */
-
net_dev->num_tc = num_tc;
- return 0;
+
+ return netif_set_real_num_tx_queues(net_dev,
+ max_t(int, num_tc, 1) *
+ efx->n_tx_channels);
}
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