[PATCH v5 net-next 00/15] MTU/buffer reconfig changes

[PATCH v5 net-next 00/15] MTU/buffer reconfig changes

[Jakub Kicinski]

Hi!

I re-discussed MPLS/MTU internally, dropped it from the patch 1,
re-tested everything, found out I forgot about debugfs pointers,
fixed that as well.

v5:
 - don't reserve space in RX buffers for MPLS label stack
   (patch 1);
 - fix debugfs pointers to ring structures (patch 5).
v4:
 - cut down on unrelated patches;
 - don't "close" the device on error path.

--- v4 cover letter

Previous series included some not entirely related patches,
this one is cut down.  Main issue I'm trying to solve here
is that .ndo_change_mtu() in nfpvf driver is doing full
close/open to reallocate buffers - which if open fails
can result in device being basically closed even though
the interface is started.  As suggested by you I try to move
towards a paradigm where the resources are allocated first
and the MTU change is only done once I'm certain (almost)
nothing can fail.  Almost because I need to communicate 
with FW and that can always time out.

Patch 1 fixes small issue.  Next 10 patches reorganize things
so that I can easily allocate new rings and sets of buffers
while the device is running.  Patches 13 and 15 reshape the
.ndo_change_mtu() and ethtool's ring-resize operation into
desired form.


Jakub Kicinski (15):
  nfp: correct RX buffer length calculation
  nfp: move link state interrupt request/free calls
  nfp: break up nfp_net_{alloc|free}_rings
  nfp: make *x_ring_init do all the init
  nfp: allocate ring SW structs dynamically
  nfp: cleanup tx ring flush and rename to reset
  nfp: reorganize initial filling of RX rings
  nfp: preallocate RX buffers early in .ndo_open
  nfp: move filling ring information to FW config
  nfp: slice .ndo_open() and .ndo_stop() up
  nfp: sync ring state during FW reconfiguration
  nfp: propagate list buffer size in struct rx_ring
  nfp: convert .ndo_change_mtu() to prepare/commit paradigm
  nfp: pass ring count as function parameter
  nfp: allow ring size reconfiguration at runtime

 drivers/net/ethernet/netronome/nfp/nfp_net.h       |  10 +-
 .../net/ethernet/netronome/nfp/nfp_net_common.c    | 903 ++++++++++++++-------
 .../net/ethernet/netronome/nfp/nfp_net_debugfs.c   |  20 +-
 .../net/ethernet/netronome/nfp/nfp_net_ethtool.c   |  30 +-
 4 files changed, 627 insertions(+), 336 deletions(-)

-- 
1.9.1

[PATCH v5 net-next 01/15] nfp: correct RX buffer length calculation

[Jakub Kicinski]

When calculating the RX buffer length we need to account
for up to 2 VLAN tags.  Rounding up to 1k is an relic of
a distant past and can be removed.  While at it also remove
trivial print statement.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
---
 drivers/net/ethernet/netronome/nfp/nfp_net_common.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index 43c618bafdb6..0dae81454e77 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -1911,9 +1911,6 @@ static void nfp_net_set_rx_mode(struct net_device *netdev)
 static int nfp_net_change_mtu(struct net_device *netdev, int new_mtu)
 {
 	struct nfp_net *nn = netdev_priv(netdev);
-	u32 tmp;
-
-	nn_dbg(nn, "New MTU = %d\n", new_mtu);
 
 	if (new_mtu < 68 || new_mtu > nn->max_mtu) {
 		nn_err(nn, "New MTU (%d) is not valid\n", new_mtu);
@@ -1921,10 +1918,7 @@ static int nfp_net_change_mtu(struct net_device *netdev, int new_mtu)
 	}
 
 	netdev->mtu = new_mtu;
-
-	/* Freelist buffer size rounded up to the nearest 1K */
-	tmp = new_mtu + ETH_HLEN + VLAN_HLEN + NFP_NET_MAX_PREPEND;
-	nn->fl_bufsz = roundup(tmp, 1024);
+	nn->fl_bufsz = NFP_NET_MAX_PREPEND + ETH_HLEN + VLAN_HLEN * 2 + new_mtu;
 
 	/* restart if running */
 	if (netif_running(netdev)) {
-- 
1.9.1

[PATCH v5 net-next 02/15] nfp: move link state interrupt request/free calls

[Jakub Kicinski]

We need to be able to disable the link state interrupt when
the device is brought down.  We used to just free the IRQ
at the beginning of .ndo_stop().  As we now move towards
more ordered .ndo_open()/.ndo_stop() paths LSC allocation
should be placed in the "allocate resource" section.

Since the IRQ can't be freed early in .ndo_stop(), it is
disabled instead.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
---
 .../net/ethernet/netronome/nfp/nfp_net_common.c    | 23 +++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index 0dae81454e77..5da1199e7afb 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -1729,10 +1729,16 @@ static int nfp_net_netdev_open(struct net_device *netdev)
 				      NFP_NET_IRQ_EXN_IDX, nn->exn_handler);
 	if (err)
 		return err;
+	err = nfp_net_aux_irq_request(nn, NFP_NET_CFG_LSC, "%s-lsc",
+				      nn->lsc_name, sizeof(nn->lsc_name),
+				      NFP_NET_IRQ_LSC_IDX, nn->lsc_handler);
+	if (err)
+		goto err_free_exn;
+	disable_irq(nn->irq_entries[NFP_NET_CFG_LSC].vector);
 
 	err = nfp_net_alloc_rings(nn);
 	if (err)
-		goto err_free_exn;
+		goto err_free_lsc;
 
 	err = netif_set_real_num_tx_queues(netdev, nn->num_tx_rings);
 	if (err)
@@ -1812,19 +1818,11 @@ static int nfp_net_netdev_open(struct net_device *netdev)
 
 	netif_tx_wake_all_queues(netdev);
 
-	err = nfp_net_aux_irq_request(nn, NFP_NET_CFG_LSC, "%s-lsc",
-				      nn->lsc_name, sizeof(nn->lsc_name),
-				      NFP_NET_IRQ_LSC_IDX, nn->lsc_handler);
-	if (err)
-		goto err_stop_tx;
+	enable_irq(nn->irq_entries[NFP_NET_CFG_LSC].vector);
 	nfp_net_read_link_status(nn);
 
 	return 0;
 
-err_stop_tx:
-	netif_tx_disable(netdev);
-	for (r = 0; r < nn->num_r_vecs; r++)
-		nfp_net_tx_flush(nn->r_vecs[r].tx_ring);
 err_disable_napi:
 	while (r--) {
 		napi_disable(&nn->r_vecs[r].napi);
@@ -1834,6 +1832,8 @@ err_clear_config:
 	nfp_net_clear_config_and_disable(nn);
 err_free_rings:
 	nfp_net_free_rings(nn);
+err_free_lsc:
+	nfp_net_aux_irq_free(nn, NFP_NET_CFG_LSC, NFP_NET_IRQ_LSC_IDX);
 err_free_exn:
 	nfp_net_aux_irq_free(nn, NFP_NET_CFG_EXN, NFP_NET_IRQ_EXN_IDX);
 	return err;
@@ -1855,7 +1855,7 @@ static int nfp_net_netdev_close(struct net_device *netdev)
 
 	/* Step 1: Disable RX and TX rings from the Linux kernel perspective
 	 */
-	nfp_net_aux_irq_free(nn, NFP_NET_CFG_LSC, NFP_NET_IRQ_LSC_IDX);
+	disable_irq(nn->irq_entries[NFP_NET_CFG_LSC].vector);
 	netif_carrier_off(netdev);
 	nn->link_up = false;
 
@@ -1876,6 +1876,7 @@ static int nfp_net_netdev_close(struct net_device *netdev)
 	}
 
 	nfp_net_free_rings(nn);
+	nfp_net_aux_irq_free(nn, NFP_NET_CFG_LSC, NFP_NET_IRQ_LSC_IDX);
 	nfp_net_aux_irq_free(nn, NFP_NET_CFG_EXN, NFP_NET_IRQ_EXN_IDX);
 
 	nn_dbg(nn, "%s down", netdev->name);
-- 
1.9.1

[PATCH v5 net-next 03/15] nfp: break up nfp_net_{alloc|free}_rings

[Jakub Kicinski]

nfp_net_{alloc|free}_rings contained strange mix of allocations
and vector initialization.  Remove it, declare vector init as
a separate function and handle allocations explicitly.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
---
 .../net/ethernet/netronome/nfp/nfp_net_common.c    | 126 ++++++++-------------
 1 file changed, 47 insertions(+), 79 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index 5da1199e7afb..8692587904c5 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -1488,91 +1488,40 @@ err_alloc:
 	return -ENOMEM;
 }
 
-static void __nfp_net_free_rings(struct nfp_net *nn, unsigned int n_free)
+static int
+nfp_net_prepare_vector(struct nfp_net *nn, struct nfp_net_r_vector *r_vec,
+		       int idx)
 {
-	struct nfp_net_r_vector *r_vec;
-	struct msix_entry *entry;
+	struct msix_entry *entry = &nn->irq_entries[r_vec->irq_idx];
+	int err;
 
-	while (n_free--) {
-		r_vec = &nn->r_vecs[n_free];
-		entry = &nn->irq_entries[r_vec->irq_idx];
+	snprintf(r_vec->name, sizeof(r_vec->name),
+		 "%s-rxtx-%d", nn->netdev->name, idx);
+	err = request_irq(entry->vector, r_vec->handler, 0, r_vec->name, r_vec);
+	if (err) {
+		nn_err(nn, "Error requesting IRQ %d\n", entry->vector);
+		return err;
+	}
 
-		nfp_net_rx_ring_free(r_vec->rx_ring);
-		nfp_net_tx_ring_free(r_vec->tx_ring);
+	/* Setup NAPI */
+	netif_napi_add(nn->netdev, &r_vec->napi,
+		       nfp_net_poll, NAPI_POLL_WEIGHT);
 
-		irq_set_affinity_hint(entry->vector, NULL);
-		free_irq(entry->vector, r_vec);
+	irq_set_affinity_hint(entry->vector, &r_vec->affinity_mask);
 
-		netif_napi_del(&r_vec->napi);
-	}
-}
+	nn_dbg(nn, "RV%02d: irq=%03d/%03d\n", idx, entry->vector, entry->entry);
 
-/**
- * nfp_net_free_rings() - Free all ring resources
- * @nn:      NFP Net device to reconfigure
- */
-static void nfp_net_free_rings(struct nfp_net *nn)
-{
-	__nfp_net_free_rings(nn, nn->num_r_vecs);
+	return 0;
 }
 
-/**
- * nfp_net_alloc_rings() - Allocate resources for RX and TX rings
- * @nn:      NFP Net device to reconfigure
- *
- * Return: 0 on success or negative errno on error.
- */
-static int nfp_net_alloc_rings(struct nfp_net *nn)
+static void
+nfp_net_cleanup_vector(struct nfp_net *nn, struct nfp_net_r_vector *r_vec)
 {
-	struct nfp_net_r_vector *r_vec;
-	struct msix_entry *entry;
-	int err;
-	int r;
+	struct msix_entry *entry = &nn->irq_entries[r_vec->irq_idx];
 
-	for (r = 0; r < nn->num_r_vecs; r++) {
-		r_vec = &nn->r_vecs[r];
-		entry = &nn->irq_entries[r_vec->irq_idx];
-
-		/* Setup NAPI */
-		netif_napi_add(nn->netdev, &r_vec->napi,
-			       nfp_net_poll, NAPI_POLL_WEIGHT);
-
-		snprintf(r_vec->name, sizeof(r_vec->name),
-			 "%s-rxtx-%d", nn->netdev->name, r);
-		err = request_irq(entry->vector, r_vec->handler, 0,
-				  r_vec->name, r_vec);
-		if (err) {
-			nn_dbg(nn, "Error requesting IRQ %d\n", entry->vector);
-			goto err_napi_del;
-		}
-
-		irq_set_affinity_hint(entry->vector, &r_vec->affinity_mask);
-
-		nn_dbg(nn, "RV%02d: irq=%03d/%03d\n",
-		       r, entry->vector, entry->entry);
-
-		/* Allocate TX ring resources */
-		err = nfp_net_tx_ring_alloc(r_vec->tx_ring);
-		if (err)
-			goto err_free_irq;
-
-		/* Allocate RX ring resources */
-		err = nfp_net_rx_ring_alloc(r_vec->rx_ring);
-		if (err)
-			goto err_free_tx;
-	}
-
-	return 0;
-
-err_free_tx:
-	nfp_net_tx_ring_free(r_vec->tx_ring);
-err_free_irq:
 	irq_set_affinity_hint(entry->vector, NULL);
-	free_irq(entry->vector, r_vec);
-err_napi_del:
 	netif_napi_del(&r_vec->napi);
-	__nfp_net_free_rings(nn, r);
-	return err;
+	free_irq(entry->vector, r_vec);
 }
 
 /**
@@ -1736,9 +1685,19 @@ static int nfp_net_netdev_open(struct net_device *netdev)
 		goto err_free_exn;
 	disable_irq(nn->irq_entries[NFP_NET_CFG_LSC].vector);
 
-	err = nfp_net_alloc_rings(nn);
-	if (err)
-		goto err_free_lsc;
+	for (r = 0; r < nn->num_r_vecs; r++) {
+		err = nfp_net_prepare_vector(nn, &nn->r_vecs[r], r);
+		if (err)
+			goto err_free_prev_vecs;
+
+		err = nfp_net_tx_ring_alloc(nn->r_vecs[r].tx_ring);
+		if (err)
+			goto err_cleanup_vec_p;
+
+		err = nfp_net_rx_ring_alloc(nn->r_vecs[r].rx_ring);
+		if (err)
+			goto err_free_tx_ring_p;
+	}
 
 	err = netif_set_real_num_tx_queues(netdev, nn->num_tx_rings);
 	if (err)
@@ -1831,8 +1790,15 @@ err_disable_napi:
 err_clear_config:
 	nfp_net_clear_config_and_disable(nn);
 err_free_rings:
-	nfp_net_free_rings(nn);
-err_free_lsc:
+	r = nn->num_r_vecs;
+err_free_prev_vecs:
+	while (r--) {
+		nfp_net_rx_ring_free(nn->r_vecs[r].rx_ring);
+err_free_tx_ring_p:
+		nfp_net_tx_ring_free(nn->r_vecs[r].tx_ring);
+err_cleanup_vec_p:
+		nfp_net_cleanup_vector(nn, &nn->r_vecs[r]);
+	}
 	nfp_net_aux_irq_free(nn, NFP_NET_CFG_LSC, NFP_NET_IRQ_LSC_IDX);
 err_free_exn:
 	nfp_net_aux_irq_free(nn, NFP_NET_CFG_EXN, NFP_NET_IRQ_EXN_IDX);
@@ -1873,9 +1839,11 @@ static int nfp_net_netdev_close(struct net_device *netdev)
 	for (r = 0; r < nn->num_r_vecs; r++) {
 		nfp_net_rx_flush(nn->r_vecs[r].rx_ring);
 		nfp_net_tx_flush(nn->r_vecs[r].tx_ring);
+		nfp_net_rx_ring_free(nn->r_vecs[r].rx_ring);
+		nfp_net_tx_ring_free(nn->r_vecs[r].tx_ring);
+		nfp_net_cleanup_vector(nn, &nn->r_vecs[r]);
 	}
 
-	nfp_net_free_rings(nn);
 	nfp_net_aux_irq_free(nn, NFP_NET_CFG_LSC, NFP_NET_IRQ_LSC_IDX);
 	nfp_net_aux_irq_free(nn, NFP_NET_CFG_EXN, NFP_NET_IRQ_EXN_IDX);
 
-- 
1.9.1

[PATCH v5 net-next 04/15] nfp: make *x_ring_init do all the init

[Jakub Kicinski]

nfp_net_[rt]x_ring_init functions used to be called from probe
path only and some of their functionality was spilled to the
call site.  In order to reuse them for ring reconfiguration
we need them to do all the init.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
---
 .../net/ethernet/netronome/nfp/nfp_net_common.c    | 28 ++++++++++++++--------
 1 file changed, 18 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index 8692587904c5..7cd20fcd631a 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -347,12 +347,18 @@ static irqreturn_t nfp_net_irq_exn(int irq, void *data)
 /**
  * nfp_net_tx_ring_init() - Fill in the boilerplate for a TX ring
  * @tx_ring:  TX ring structure
+ * @r_vec:    IRQ vector servicing this ring
+ * @idx:      Ring index
  */
-static void nfp_net_tx_ring_init(struct nfp_net_tx_ring *tx_ring)
+static void
+nfp_net_tx_ring_init(struct nfp_net_tx_ring *tx_ring,
+		     struct nfp_net_r_vector *r_vec, unsigned int idx)
 {
-	struct nfp_net_r_vector *r_vec = tx_ring->r_vec;
 	struct nfp_net *nn = r_vec->nfp_net;
 
+	tx_ring->idx = idx;
+	tx_ring->r_vec = r_vec;
+
 	tx_ring->qcidx = tx_ring->idx * nn->stride_tx;
 	tx_ring->qcp_q = nn->tx_bar + NFP_QCP_QUEUE_OFF(tx_ring->qcidx);
 }
@@ -360,12 +366,18 @@ static void nfp_net_tx_ring_init(struct nfp_net_tx_ring *tx_ring)
 /**
  * nfp_net_rx_ring_init() - Fill in the boilerplate for a RX ring
  * @rx_ring:  RX ring structure
+ * @r_vec:    IRQ vector servicing this ring
+ * @idx:      Ring index
  */
-static void nfp_net_rx_ring_init(struct nfp_net_rx_ring *rx_ring)
+static void
+nfp_net_rx_ring_init(struct nfp_net_rx_ring *rx_ring,
+		     struct nfp_net_r_vector *r_vec, unsigned int idx)
 {
-	struct nfp_net_r_vector *r_vec = rx_ring->r_vec;
 	struct nfp_net *nn = r_vec->nfp_net;
 
+	rx_ring->idx = idx;
+	rx_ring->r_vec = r_vec;
+
 	rx_ring->fl_qcidx = rx_ring->idx * nn->stride_rx;
 	rx_ring->rx_qcidx = rx_ring->fl_qcidx + (nn->stride_rx - 1);
 
@@ -403,14 +415,10 @@ static void nfp_net_irqs_assign(struct net_device *netdev)
 		cpumask_set_cpu(r, &r_vec->affinity_mask);
 
 		r_vec->tx_ring = &nn->tx_rings[r];
-		nn->tx_rings[r].idx = r;
-		nn->tx_rings[r].r_vec = r_vec;
-		nfp_net_tx_ring_init(r_vec->tx_ring);
+		nfp_net_tx_ring_init(r_vec->tx_ring, r_vec, r);
 
 		r_vec->rx_ring = &nn->rx_rings[r];
-		nn->rx_rings[r].idx = r;
-		nn->rx_rings[r].r_vec = r_vec;
-		nfp_net_rx_ring_init(r_vec->rx_ring);
+		nfp_net_rx_ring_init(r_vec->rx_ring, r_vec, r);
 	}
 }
 
-- 
1.9.1

[PATCH v5 net-next 05/15] nfp: allocate ring SW structs dynamically

[Jakub Kicinski]

To be able to switch rings more easily on config changes
allocate them dynamically, separately from nfp_net structure.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
---
 drivers/net/ethernet/netronome/nfp/nfp_net.h       |  6 ++---
 .../net/ethernet/netronome/nfp/nfp_net_common.c    | 28 +++++++++++++++++-----
 .../net/ethernet/netronome/nfp/nfp_net_debugfs.c   | 20 +++++++++-------
 3 files changed, 37 insertions(+), 17 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net.h b/drivers/net/ethernet/netronome/nfp/nfp_net.h
index 75683fb26734..fc005c982b7d 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net.h
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net.h
@@ -472,6 +472,9 @@ struct nfp_net {
 
 	u32 rx_offset;
 
+	struct nfp_net_tx_ring *tx_rings;
+	struct nfp_net_rx_ring *rx_rings;
+
 #ifdef CONFIG_PCI_IOV
 	unsigned int num_vfs;
 	struct vf_data_storage *vfinfo;
@@ -504,9 +507,6 @@ struct nfp_net {
 	int txd_cnt;
 	int rxd_cnt;
 
-	struct nfp_net_tx_ring tx_rings[NFP_NET_MAX_TX_RINGS];
-	struct nfp_net_rx_ring rx_rings[NFP_NET_MAX_RX_RINGS];
-
 	u8 num_irqs;
 	u8 num_r_vecs;
 	struct nfp_net_r_vector r_vecs[NFP_NET_MAX_TX_RINGS];
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index 7cd20fcd631a..66fab7162b7c 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -413,12 +413,6 @@ static void nfp_net_irqs_assign(struct net_device *netdev)
 		r_vec->irq_idx = NFP_NET_NON_Q_VECTORS + r;
 
 		cpumask_set_cpu(r, &r_vec->affinity_mask);
-
-		r_vec->tx_ring = &nn->tx_rings[r];
-		nfp_net_tx_ring_init(r_vec->tx_ring, r_vec, r);
-
-		r_vec->rx_ring = &nn->rx_rings[r];
-		nfp_net_rx_ring_init(r_vec->rx_ring, r_vec, r);
 	}
 }
 
@@ -1503,6 +1497,12 @@ nfp_net_prepare_vector(struct nfp_net *nn, struct nfp_net_r_vector *r_vec,
 	struct msix_entry *entry = &nn->irq_entries[r_vec->irq_idx];
 	int err;
 
+	r_vec->tx_ring = &nn->tx_rings[idx];
+	nfp_net_tx_ring_init(r_vec->tx_ring, r_vec, idx);
+
+	r_vec->rx_ring = &nn->rx_rings[idx];
+	nfp_net_rx_ring_init(r_vec->rx_ring, r_vec, idx);
+
 	snprintf(r_vec->name, sizeof(r_vec->name),
 		 "%s-rxtx-%d", nn->netdev->name, idx);
 	err = request_irq(entry->vector, r_vec->handler, 0, r_vec->name, r_vec);
@@ -1693,6 +1693,15 @@ static int nfp_net_netdev_open(struct net_device *netdev)
 		goto err_free_exn;
 	disable_irq(nn->irq_entries[NFP_NET_CFG_LSC].vector);
 
+	nn->rx_rings = kcalloc(nn->num_rx_rings, sizeof(*nn->rx_rings),
+			       GFP_KERNEL);
+	if (!nn->rx_rings)
+		goto err_free_lsc;
+	nn->tx_rings = kcalloc(nn->num_tx_rings, sizeof(*nn->tx_rings),
+			       GFP_KERNEL);
+	if (!nn->tx_rings)
+		goto err_free_rx_rings;
+
 	for (r = 0; r < nn->num_r_vecs; r++) {
 		err = nfp_net_prepare_vector(nn, &nn->r_vecs[r], r);
 		if (err)
@@ -1807,6 +1816,10 @@ err_free_tx_ring_p:
 err_cleanup_vec_p:
 		nfp_net_cleanup_vector(nn, &nn->r_vecs[r]);
 	}
+	kfree(nn->tx_rings);
+err_free_rx_rings:
+	kfree(nn->rx_rings);
+err_free_lsc:
 	nfp_net_aux_irq_free(nn, NFP_NET_CFG_LSC, NFP_NET_IRQ_LSC_IDX);
 err_free_exn:
 	nfp_net_aux_irq_free(nn, NFP_NET_CFG_EXN, NFP_NET_IRQ_EXN_IDX);
@@ -1852,6 +1865,9 @@ static int nfp_net_netdev_close(struct net_device *netdev)
 		nfp_net_cleanup_vector(nn, &nn->r_vecs[r]);
 	}
 
+	kfree(nn->rx_rings);
+	kfree(nn->tx_rings);
+
 	nfp_net_aux_irq_free(nn, NFP_NET_CFG_LSC, NFP_NET_IRQ_LSC_IDX);
 	nfp_net_aux_irq_free(nn, NFP_NET_CFG_EXN, NFP_NET_IRQ_EXN_IDX);
 
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_debugfs.c b/drivers/net/ethernet/netronome/nfp/nfp_net_debugfs.c
index 4c97c713121c..f86a1f13d27b 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_debugfs.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_debugfs.c
@@ -40,8 +40,9 @@ static struct dentry *nfp_dir;
 
 static int nfp_net_debugfs_rx_q_read(struct seq_file *file, void *data)
 {
-	struct nfp_net_rx_ring *rx_ring = file->private;
 	int fl_rd_p, fl_wr_p, rx_rd_p, rx_wr_p, rxd_cnt;
+	struct nfp_net_r_vector *r_vec = file->private;
+	struct nfp_net_rx_ring *rx_ring;
 	struct nfp_net_rx_desc *rxd;
 	struct sk_buff *skb;
 	struct nfp_net *nn;
@@ -49,9 +50,10 @@ static int nfp_net_debugfs_rx_q_read(struct seq_file *file, void *data)
 
 	rtnl_lock();
 
-	if (!rx_ring->r_vec || !rx_ring->r_vec->nfp_net)
+	if (!r_vec->nfp_net || !r_vec->rx_ring)
 		goto out;
-	nn = rx_ring->r_vec->nfp_net;
+	nn = r_vec->nfp_net;
+	rx_ring = r_vec->rx_ring;
 	if (!netif_running(nn->netdev))
 		goto out;
 
@@ -115,7 +117,8 @@ static const struct file_operations nfp_rx_q_fops = {
 
 static int nfp_net_debugfs_tx_q_read(struct seq_file *file, void *data)
 {
-	struct nfp_net_tx_ring *tx_ring = file->private;
+	struct nfp_net_r_vector *r_vec = file->private;
+	struct nfp_net_tx_ring *tx_ring;
 	struct nfp_net_tx_desc *txd;
 	int d_rd_p, d_wr_p, txd_cnt;
 	struct sk_buff *skb;
@@ -124,9 +127,10 @@ static int nfp_net_debugfs_tx_q_read(struct seq_file *file, void *data)
 
 	rtnl_lock();
 
-	if (!tx_ring->r_vec || !tx_ring->r_vec->nfp_net)
+	if (!r_vec->nfp_net || !r_vec->tx_ring)
 		goto out;
-	nn = tx_ring->r_vec->nfp_net;
+	nn = r_vec->nfp_net;
+	tx_ring = r_vec->tx_ring;
 	if (!netif_running(nn->netdev))
 		goto out;
 
@@ -207,13 +211,13 @@ void nfp_net_debugfs_adapter_add(struct nfp_net *nn)
 	for (i = 0; i < nn->num_rx_rings; i++) {
 		sprintf(int_name, "%d", i);
 		debugfs_create_file(int_name, S_IRUSR, rx,
-				    &nn->rx_rings[i], &nfp_rx_q_fops);
+				    &nn->r_vecs[i], &nfp_rx_q_fops);
 	}
 
 	for (i = 0; i < nn->num_tx_rings; i++) {
 		sprintf(int_name, "%d", i);
 		debugfs_create_file(int_name, S_IRUSR, tx,
-				    &nn->tx_rings[i], &nfp_tx_q_fops);
+				    &nn->r_vecs[i], &nfp_tx_q_fops);
 	}
 }
 
-- 
1.9.1

[PATCH v5 net-next 06/15] nfp: cleanup tx ring flush and rename to reset

[Jakub Kicinski]

Since we never used flush without freeing the ring later
the functionality of the two operations is mixed.
Rename flush to ring reset and move there all the things
which have to be done after FW ring state is cleared.
While at it do some clean-ups.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
---
 .../net/ethernet/netronome/nfp/nfp_net_common.c    | 81 ++++++++++------------
 1 file changed, 37 insertions(+), 44 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index 66fab7162b7c..61f243760ee0 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -867,61 +867,59 @@ static void nfp_net_tx_complete(struct nfp_net_tx_ring *tx_ring)
 }
 
 /**
- * nfp_net_tx_flush() - Free any untransmitted buffers currently on the TX ring
- * @tx_ring:     TX ring structure
+ * nfp_net_tx_ring_reset() - Free any untransmitted buffers and reset pointers
+ * @nn:		NFP Net device
+ * @tx_ring:	TX ring structure
  *
  * Assumes that the device is stopped
  */
-static void nfp_net_tx_flush(struct nfp_net_tx_ring *tx_ring)
+static void
+nfp_net_tx_ring_reset(struct nfp_net *nn, struct nfp_net_tx_ring *tx_ring)
 {
-	struct nfp_net_r_vector *r_vec = tx_ring->r_vec;
-	struct nfp_net *nn = r_vec->nfp_net;
-	struct pci_dev *pdev = nn->pdev;
 	const struct skb_frag_struct *frag;
 	struct netdev_queue *nd_q;
-	struct sk_buff *skb;
-	int nr_frags;
-	int fidx;
-	int idx;
+	struct pci_dev *pdev = nn->pdev;
 
 	while (tx_ring->rd_p != tx_ring->wr_p) {
-		idx = tx_ring->rd_p % tx_ring->cnt;
+		int nr_frags, fidx, idx;
+		struct sk_buff *skb;
 
+		idx = tx_ring->rd_p % tx_ring->cnt;
 		skb = tx_ring->txbufs[idx].skb;
-		if (skb) {
-			nr_frags = skb_shinfo(skb)->nr_frags;
-			fidx = tx_ring->txbufs[idx].fidx;
-
-			if (fidx == -1) {
-				/* unmap head */
-				dma_unmap_single(&pdev->dev,
-						 tx_ring->txbufs[idx].dma_addr,
-						 skb_headlen(skb),
-						 DMA_TO_DEVICE);
-			} else {
-				/* unmap fragment */
-				frag = &skb_shinfo(skb)->frags[fidx];
-				dma_unmap_page(&pdev->dev,
-					       tx_ring->txbufs[idx].dma_addr,
-					       skb_frag_size(frag),
-					       DMA_TO_DEVICE);
-			}
-
-			/* check for last gather fragment */
-			if (fidx == nr_frags - 1)
-				dev_kfree_skb_any(skb);
-
-			tx_ring->txbufs[idx].dma_addr = 0;
-			tx_ring->txbufs[idx].skb = NULL;
-			tx_ring->txbufs[idx].fidx = -2;
+		nr_frags = skb_shinfo(skb)->nr_frags;
+		fidx = tx_ring->txbufs[idx].fidx;
+
+		if (fidx == -1) {
+			/* unmap head */
+			dma_unmap_single(&pdev->dev,
+					 tx_ring->txbufs[idx].dma_addr,
+					 skb_headlen(skb), DMA_TO_DEVICE);
+		} else {
+			/* unmap fragment */
+			frag = &skb_shinfo(skb)->frags[fidx];
+			dma_unmap_page(&pdev->dev,
+				       tx_ring->txbufs[idx].dma_addr,
+				       skb_frag_size(frag), DMA_TO_DEVICE);
 		}
 
-		memset(&tx_ring->txds[idx], 0, sizeof(tx_ring->txds[idx]));
+		/* check for last gather fragment */
+		if (fidx == nr_frags - 1)
+			dev_kfree_skb_any(skb);
+
+		tx_ring->txbufs[idx].dma_addr = 0;
+		tx_ring->txbufs[idx].skb = NULL;
+		tx_ring->txbufs[idx].fidx = -2;
 
 		tx_ring->qcp_rd_p++;
 		tx_ring->rd_p++;
 	}
 
+	memset(tx_ring->txds, 0, sizeof(*tx_ring->txds) * tx_ring->cnt);
+	tx_ring->wr_p = 0;
+	tx_ring->rd_p = 0;
+	tx_ring->qcp_rd_p = 0;
+	tx_ring->wr_ptr_add = 0;
+
 	nd_q = netdev_get_tx_queue(nn->netdev, tx_ring->idx);
 	netdev_tx_reset_queue(nd_q);
 }
@@ -1362,11 +1360,6 @@ static void nfp_net_tx_ring_free(struct nfp_net_tx_ring *tx_ring)
 				  tx_ring->txds, tx_ring->dma);
 
 	tx_ring->cnt = 0;
-	tx_ring->wr_p = 0;
-	tx_ring->rd_p = 0;
-	tx_ring->qcp_rd_p = 0;
-	tx_ring->wr_ptr_add = 0;
-
 	tx_ring->txbufs = NULL;
 	tx_ring->txds = NULL;
 	tx_ring->dma = 0;
@@ -1859,7 +1852,7 @@ static int nfp_net_netdev_close(struct net_device *netdev)
 	 */
 	for (r = 0; r < nn->num_r_vecs; r++) {
 		nfp_net_rx_flush(nn->r_vecs[r].rx_ring);
-		nfp_net_tx_flush(nn->r_vecs[r].tx_ring);
+		nfp_net_tx_ring_reset(nn, nn->r_vecs[r].tx_ring);
 		nfp_net_rx_ring_free(nn->r_vecs[r].rx_ring);
 		nfp_net_tx_ring_free(nn->r_vecs[r].tx_ring);
 		nfp_net_cleanup_vector(nn, &nn->r_vecs[r]);
-- 
1.9.1

[PATCH v5 net-next 07/15] nfp: reorganize initial filling of RX rings

[Jakub Kicinski]

Separate allocation of buffers from giving them to FW,
thanks to this it will be possible to move allocation
earlier on .ndo_open() path and reuse buffers during
runtime reconfiguration.

Similar to TX side clean up the spill of functionality
from flush to freeing the ring.  Unlike on TX side,
RX ring reset does not free buffers from the ring.
Ring reset means only that FW pointers are zeroed and
buffers on the ring must be placed in [0, cnt - 1)
positions.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
---
 .../net/ethernet/netronome/nfp/nfp_net_common.c    | 119 ++++++++++++++-------
 1 file changed, 78 insertions(+), 41 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index 61f243760ee0..0c3c37ad28a4 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -1020,62 +1020,100 @@ static void nfp_net_rx_give_one(struct nfp_net_rx_ring *rx_ring,
 }
 
 /**
- * nfp_net_rx_flush() - Free any buffers currently on the RX ring
- * @rx_ring:  RX ring to remove buffers from
+ * nfp_net_rx_ring_reset() - Reflect in SW state of freelist after disable
+ * @rx_ring:	RX ring structure
  *
- * Assumes that the device is stopped
+ * Warning: Do *not* call if ring buffers were never put on the FW freelist
+ *	    (i.e. device was not enabled)!
  */
-static void nfp_net_rx_flush(struct nfp_net_rx_ring *rx_ring)
+static void nfp_net_rx_ring_reset(struct nfp_net_rx_ring *rx_ring)
 {
-	struct nfp_net *nn = rx_ring->r_vec->nfp_net;
-	struct pci_dev *pdev = nn->pdev;
-	int idx;
+	unsigned int wr_idx, last_idx;
 
-	while (rx_ring->rd_p != rx_ring->wr_p) {
-		idx = rx_ring->rd_p % rx_ring->cnt;
+	/* Move the empty entry to the end of the list */
+	wr_idx = rx_ring->wr_p % rx_ring->cnt;
+	last_idx = rx_ring->cnt - 1;
+	rx_ring->rxbufs[wr_idx].dma_addr = rx_ring->rxbufs[last_idx].dma_addr;
+	rx_ring->rxbufs[wr_idx].skb = rx_ring->rxbufs[last_idx].skb;
+	rx_ring->rxbufs[last_idx].dma_addr = 0;
+	rx_ring->rxbufs[last_idx].skb = NULL;
 
-		if (rx_ring->rxbufs[idx].skb) {
-			dma_unmap_single(&pdev->dev,
-					 rx_ring->rxbufs[idx].dma_addr,
-					 nn->fl_bufsz, DMA_FROM_DEVICE);
-			dev_kfree_skb_any(rx_ring->rxbufs[idx].skb);
-			rx_ring->rxbufs[idx].dma_addr = 0;
-			rx_ring->rxbufs[idx].skb = NULL;
-		}
+	memset(rx_ring->rxds, 0, sizeof(*rx_ring->rxds) * rx_ring->cnt);
+	rx_ring->wr_p = 0;
+	rx_ring->rd_p = 0;
+	rx_ring->wr_ptr_add = 0;
+}
 
-		memset(&rx_ring->rxds[idx], 0, sizeof(rx_ring->rxds[idx]));
+/**
+ * nfp_net_rx_ring_bufs_free() - Free any buffers currently on the RX ring
+ * @nn:		NFP Net device
+ * @rx_ring:	RX ring to remove buffers from
+ *
+ * Assumes that the device is stopped and buffers are in [0, ring->cnt - 1)
+ * entries.  After device is disabled nfp_net_rx_ring_reset() must be called
+ * to restore required ring geometry.
+ */
+static void
+nfp_net_rx_ring_bufs_free(struct nfp_net *nn, struct nfp_net_rx_ring *rx_ring)
+{
+	struct pci_dev *pdev = nn->pdev;
+	unsigned int i;
 
-		rx_ring->rd_p++;
+	for (i = 0; i < rx_ring->cnt - 1; i++) {
+		/* NULL skb can only happen when initial filling of the ring
+		 * fails to allocate enough buffers and calls here to free
+		 * already allocated ones.
+		 */
+		if (!rx_ring->rxbufs[i].skb)
+			continue;
+
+		dma_unmap_single(&pdev->dev, rx_ring->rxbufs[i].dma_addr,
+				 nn->fl_bufsz, DMA_FROM_DEVICE);
+		dev_kfree_skb_any(rx_ring->rxbufs[i].skb);
+		rx_ring->rxbufs[i].dma_addr = 0;
+		rx_ring->rxbufs[i].skb = NULL;
 	}
 }
 
 /**
- * nfp_net_rx_fill_freelist() - Attempt filling freelist with RX buffers
- * @rx_ring: RX ring to fill
- *
- * Try to fill as many buffers as possible into freelist.  Return
- * number of buffers added.
- *
- * Return: Number of freelist buffers added.
+ * nfp_net_rx_ring_bufs_alloc() - Fill RX ring with buffers (don't give to FW)
+ * @nn:		NFP Net device
+ * @rx_ring:	RX ring to remove buffers from
  */
-static int nfp_net_rx_fill_freelist(struct nfp_net_rx_ring *rx_ring)
+static int
+nfp_net_rx_ring_bufs_alloc(struct nfp_net *nn, struct nfp_net_rx_ring *rx_ring)
 {
-	struct sk_buff *skb;
-	dma_addr_t dma_addr;
+	struct nfp_net_rx_buf *rxbufs;
+	unsigned int i;
+
+	rxbufs = rx_ring->rxbufs;
 
-	while (nfp_net_rx_space(rx_ring)) {
-		skb = nfp_net_rx_alloc_one(rx_ring, &dma_addr);
-		if (!skb) {
-			nfp_net_rx_flush(rx_ring);
+	for (i = 0; i < rx_ring->cnt - 1; i++) {
+		rxbufs[i].skb =
+			nfp_net_rx_alloc_one(rx_ring, &rxbufs[i].dma_addr);
+		if (!rxbufs[i].skb) {
+			nfp_net_rx_ring_bufs_free(nn, rx_ring);
 			return -ENOMEM;
 		}
-		nfp_net_rx_give_one(rx_ring, skb, dma_addr);
 	}
 
 	return 0;
 }
 
 /**
+ * nfp_net_rx_ring_fill_freelist() - Give buffers from the ring to FW
+ * @rx_ring: RX ring to fill
+ */
+static void nfp_net_rx_ring_fill_freelist(struct nfp_net_rx_ring *rx_ring)
+{
+	unsigned int i;
+
+	for (i = 0; i < rx_ring->cnt - 1; i++)
+		nfp_net_rx_give_one(rx_ring, rx_ring->rxbufs[i].skb,
+				    rx_ring->rxbufs[i].dma_addr);
+}
+
+/**
  * nfp_net_rx_csum_has_errors() - group check if rxd has any csum errors
  * @flags: RX descriptor flags field in CPU byte order
  */
@@ -1431,10 +1469,6 @@ static void nfp_net_rx_ring_free(struct nfp_net_rx_ring *rx_ring)
 				  rx_ring->rxds, rx_ring->dma);
 
 	rx_ring->cnt = 0;
-	rx_ring->wr_p = 0;
-	rx_ring->rd_p = 0;
-	rx_ring->wr_ptr_add = 0;
-
 	rx_ring->rxbufs = NULL;
 	rx_ring->rxds = NULL;
 	rx_ring->dma = 0;
@@ -1641,12 +1675,13 @@ static int nfp_net_start_vec(struct nfp_net *nn, struct nfp_net_r_vector *r_vec)
 
 	disable_irq(irq_vec);
 
-	err = nfp_net_rx_fill_freelist(r_vec->rx_ring);
+	err = nfp_net_rx_ring_bufs_alloc(r_vec->nfp_net, r_vec->rx_ring);
 	if (err) {
 		nn_err(nn, "RV%02d: couldn't allocate enough buffers\n",
 		       r_vec->irq_idx);
 		goto out;
 	}
+	nfp_net_rx_ring_fill_freelist(r_vec->rx_ring);
 
 	napi_enable(&r_vec->napi);
 out:
@@ -1795,7 +1830,8 @@ static int nfp_net_netdev_open(struct net_device *netdev)
 err_disable_napi:
 	while (r--) {
 		napi_disable(&nn->r_vecs[r].napi);
-		nfp_net_rx_flush(nn->r_vecs[r].rx_ring);
+		nfp_net_rx_ring_reset(nn->r_vecs[r].rx_ring);
+		nfp_net_rx_ring_bufs_free(nn, nn->r_vecs[r].rx_ring);
 	}
 err_clear_config:
 	nfp_net_clear_config_and_disable(nn);
@@ -1851,7 +1887,8 @@ static int nfp_net_netdev_close(struct net_device *netdev)
 	/* Step 3: Free resources
 	 */
 	for (r = 0; r < nn->num_r_vecs; r++) {
-		nfp_net_rx_flush(nn->r_vecs[r].rx_ring);
+		nfp_net_rx_ring_reset(nn->r_vecs[r].rx_ring);
+		nfp_net_rx_ring_bufs_free(nn, nn->r_vecs[r].rx_ring);
 		nfp_net_tx_ring_reset(nn, nn->r_vecs[r].tx_ring);
 		nfp_net_rx_ring_free(nn->r_vecs[r].rx_ring);
 		nfp_net_tx_ring_free(nn->r_vecs[r].tx_ring);
-- 
1.9.1

[PATCH v5 net-next 08/15] nfp: preallocate RX buffers early in .ndo_open

[Jakub Kicinski]

We want the .ndo_open() to have following structure:
 - allocate resources;
 - configure HW/FW;
 - enable the device from stack perspective.
Therefore filling RX rings needs to be moved to the beginning
of .ndo_open().

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
---
 .../net/ethernet/netronome/nfp/nfp_net_common.c    | 34 +++++++---------------
 1 file changed, 11 insertions(+), 23 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index 0c3c37ad28a4..a6a917fe8e31 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -1666,28 +1666,19 @@ static void nfp_net_clear_config_and_disable(struct nfp_net *nn)
  * @nn:      NFP Net device structure
  * @r_vec:   Ring vector to be started
  */
-static int nfp_net_start_vec(struct nfp_net *nn, struct nfp_net_r_vector *r_vec)
+static void
+nfp_net_start_vec(struct nfp_net *nn, struct nfp_net_r_vector *r_vec)
 {
 	unsigned int irq_vec;
-	int err = 0;
 
 	irq_vec = nn->irq_entries[r_vec->irq_idx].vector;
 
 	disable_irq(irq_vec);
 
-	err = nfp_net_rx_ring_bufs_alloc(r_vec->nfp_net, r_vec->rx_ring);
-	if (err) {
-		nn_err(nn, "RV%02d: couldn't allocate enough buffers\n",
-		       r_vec->irq_idx);
-		goto out;
-	}
 	nfp_net_rx_ring_fill_freelist(r_vec->rx_ring);
-
 	napi_enable(&r_vec->napi);
-out:
-	enable_irq(irq_vec);
 
-	return err;
+	enable_irq(irq_vec);
 }
 
 static int nfp_net_netdev_open(struct net_device *netdev)
@@ -1742,6 +1733,10 @@ static int nfp_net_netdev_open(struct net_device *netdev)
 		err = nfp_net_rx_ring_alloc(nn->r_vecs[r].rx_ring);
 		if (err)
 			goto err_free_tx_ring_p;
+
+		err = nfp_net_rx_ring_bufs_alloc(nn, nn->r_vecs[r].rx_ring);
+		if (err)
+			goto err_flush_rx_ring_p;
 	}
 
 	err = netif_set_real_num_tx_queues(netdev, nn->num_tx_rings);
@@ -1814,11 +1809,8 @@ static int nfp_net_netdev_open(struct net_device *netdev)
 	 * - enable all TX queues
 	 * - set link state
 	 */
-	for (r = 0; r < nn->num_r_vecs; r++) {
-		err = nfp_net_start_vec(nn, &nn->r_vecs[r]);
-		if (err)
-			goto err_disable_napi;
-	}
+	for (r = 0; r < nn->num_r_vecs; r++)
+		nfp_net_start_vec(nn, &nn->r_vecs[r]);
 
 	netif_tx_wake_all_queues(netdev);
 
@@ -1827,18 +1819,14 @@ static int nfp_net_netdev_open(struct net_device *netdev)
 
 	return 0;
 
-err_disable_napi:
-	while (r--) {
-		napi_disable(&nn->r_vecs[r].napi);
-		nfp_net_rx_ring_reset(nn->r_vecs[r].rx_ring);
-		nfp_net_rx_ring_bufs_free(nn, nn->r_vecs[r].rx_ring);
-	}
 err_clear_config:
 	nfp_net_clear_config_and_disable(nn);
 err_free_rings:
 	r = nn->num_r_vecs;
 err_free_prev_vecs:
 	while (r--) {
+		nfp_net_rx_ring_bufs_free(nn, nn->r_vecs[r].rx_ring);
+err_flush_rx_ring_p:
 		nfp_net_rx_ring_free(nn->r_vecs[r].rx_ring);
 err_free_tx_ring_p:
 		nfp_net_tx_ring_free(nn->r_vecs[r].tx_ring);
-- 
1.9.1

[PATCH v5 net-next 09/15] nfp: move filling ring information to FW config

[Jakub Kicinski]

nfp_net_[rt]x_ring_{alloc,free} should only allocate or free
ring resources without touching the device.  Move setting
parameters in the BAR to separate functions.  This will make
it possible to reuse alloc/free functions to allocate new
rings while the device is running.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
---
 .../net/ethernet/netronome/nfp/nfp_net_common.c    | 50 ++++++++++++++--------
 1 file changed, 32 insertions(+), 18 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index a6a917fe8e31..342335d09fb2 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -1387,10 +1387,6 @@ static void nfp_net_tx_ring_free(struct nfp_net_tx_ring *tx_ring)
 	struct nfp_net *nn = r_vec->nfp_net;
 	struct pci_dev *pdev = nn->pdev;
 
-	nn_writeq(nn, NFP_NET_CFG_TXR_ADDR(tx_ring->idx), 0);
-	nn_writeb(nn, NFP_NET_CFG_TXR_SZ(tx_ring->idx), 0);
-	nn_writeb(nn, NFP_NET_CFG_TXR_VEC(tx_ring->idx), 0);
-
 	kfree(tx_ring->txbufs);
 
 	if (tx_ring->txds)
@@ -1430,11 +1426,6 @@ static int nfp_net_tx_ring_alloc(struct nfp_net_tx_ring *tx_ring)
 	if (!tx_ring->txbufs)
 		goto err_alloc;
 
-	/* Write the DMA address, size and MSI-X info to the device */
-	nn_writeq(nn, NFP_NET_CFG_TXR_ADDR(tx_ring->idx), tx_ring->dma);
-	nn_writeb(nn, NFP_NET_CFG_TXR_SZ(tx_ring->idx), ilog2(tx_ring->cnt));
-	nn_writeb(nn, NFP_NET_CFG_TXR_VEC(tx_ring->idx), r_vec->irq_idx);
-
 	netif_set_xps_queue(nn->netdev, &r_vec->affinity_mask, tx_ring->idx);
 
 	nn_dbg(nn, "TxQ%02d: QCidx=%02d cnt=%d dma=%#llx host=%p\n",
@@ -1458,10 +1449,6 @@ static void nfp_net_rx_ring_free(struct nfp_net_rx_ring *rx_ring)
 	struct nfp_net *nn = r_vec->nfp_net;
 	struct pci_dev *pdev = nn->pdev;
 
-	nn_writeq(nn, NFP_NET_CFG_RXR_ADDR(rx_ring->idx), 0);
-	nn_writeb(nn, NFP_NET_CFG_RXR_SZ(rx_ring->idx), 0);
-	nn_writeb(nn, NFP_NET_CFG_RXR_VEC(rx_ring->idx), 0);
-
 	kfree(rx_ring->rxbufs);
 
 	if (rx_ring->rxds)
@@ -1501,11 +1488,6 @@ static int nfp_net_rx_ring_alloc(struct nfp_net_rx_ring *rx_ring)
 	if (!rx_ring->rxbufs)
 		goto err_alloc;
 
-	/* Write the DMA address, size and MSI-X info to the device */
-	nn_writeq(nn, NFP_NET_CFG_RXR_ADDR(rx_ring->idx), rx_ring->dma);
-	nn_writeb(nn, NFP_NET_CFG_RXR_SZ(rx_ring->idx), ilog2(rx_ring->cnt));
-	nn_writeb(nn, NFP_NET_CFG_RXR_VEC(rx_ring->idx), r_vec->irq_idx);
-
 	nn_dbg(nn, "RxQ%02d: FlQCidx=%02d RxQCidx=%02d cnt=%d dma=%#llx host=%p\n",
 	       rx_ring->idx, rx_ring->fl_qcidx, rx_ring->rx_qcidx,
 	       rx_ring->cnt, (unsigned long long)rx_ring->dma, rx_ring->rxds);
@@ -1630,6 +1612,17 @@ static void nfp_net_write_mac_addr(struct nfp_net *nn, const u8 *mac)
 		  get_unaligned_be16(nn->netdev->dev_addr + 4) << 16);
 }
 
+static void nfp_net_vec_clear_ring_data(struct nfp_net *nn, unsigned int idx)
+{
+	nn_writeq(nn, NFP_NET_CFG_RXR_ADDR(idx), 0);
+	nn_writeb(nn, NFP_NET_CFG_RXR_SZ(idx), 0);
+	nn_writeb(nn, NFP_NET_CFG_RXR_VEC(idx), 0);
+
+	nn_writeq(nn, NFP_NET_CFG_TXR_ADDR(idx), 0);
+	nn_writeb(nn, NFP_NET_CFG_TXR_SZ(idx), 0);
+	nn_writeb(nn, NFP_NET_CFG_TXR_VEC(idx), 0);
+}
+
 /**
  * nfp_net_clear_config_and_disable() - Clear control BAR and disable NFP
  * @nn:      NFP Net device to reconfigure
@@ -1637,6 +1630,7 @@ static void nfp_net_write_mac_addr(struct nfp_net *nn, const u8 *mac)
 static void nfp_net_clear_config_and_disable(struct nfp_net *nn)
 {
 	u32 new_ctrl, update;
+	unsigned int r;
 	int err;
 
 	new_ctrl = nn->ctrl;
@@ -1658,9 +1652,26 @@ static void nfp_net_clear_config_and_disable(struct nfp_net *nn)
 		return;
 	}
 
+	for (r = 0; r < nn->num_r_vecs; r++)
+		nfp_net_vec_clear_ring_data(nn, r);
+
 	nn->ctrl = new_ctrl;
 }
 
+static void
+nfp_net_vec_write_ring_data(struct nfp_net *nn, struct nfp_net_r_vector *r_vec,
+			    unsigned int idx)
+{
+	/* Write the DMA address, size and MSI-X info to the device */
+	nn_writeq(nn, NFP_NET_CFG_RXR_ADDR(idx), r_vec->rx_ring->dma);
+	nn_writeb(nn, NFP_NET_CFG_RXR_SZ(idx), ilog2(r_vec->rx_ring->cnt));
+	nn_writeb(nn, NFP_NET_CFG_RXR_VEC(idx), r_vec->irq_idx);
+
+	nn_writeq(nn, NFP_NET_CFG_TXR_ADDR(idx), r_vec->tx_ring->dma);
+	nn_writeb(nn, NFP_NET_CFG_TXR_SZ(idx), ilog2(r_vec->tx_ring->cnt));
+	nn_writeb(nn, NFP_NET_CFG_TXR_VEC(idx), r_vec->irq_idx);
+}
+
 /**
  * nfp_net_start_vec() - Start ring vector
  * @nn:      NFP Net device structure
@@ -1768,6 +1779,9 @@ static int nfp_net_netdev_open(struct net_device *netdev)
 	 * - Set the Freelist buffer size
 	 * - Enable the FW
 	 */
+	for (r = 0; r < nn->num_r_vecs; r++)
+		nfp_net_vec_write_ring_data(nn, &nn->r_vecs[r], r);
+
 	nn_writeq(nn, NFP_NET_CFG_TXRS_ENABLE, nn->num_tx_rings == 64 ?
 		  0xffffffffffffffffULL : ((u64)1 << nn->num_tx_rings) - 1);
 
-- 
1.9.1

[PATCH v5 net-next 10/15] nfp: slice .ndo_open() and .ndo_stop() up

[Jakub Kicinski]

Divide .ndo_open() and .ndo_stop() into logical, callable
chunks.  No functional changes.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
---
 .../net/ethernet/netronome/nfp/nfp_net_common.c    | 218 +++++++++++++--------
 1 file changed, 136 insertions(+), 82 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index 342335d09fb2..6c1ed8914416 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -1672,6 +1672,82 @@ nfp_net_vec_write_ring_data(struct nfp_net *nn, struct nfp_net_r_vector *r_vec,
 	nn_writeb(nn, NFP_NET_CFG_TXR_VEC(idx), r_vec->irq_idx);
 }
 
+static int __nfp_net_set_config_and_enable(struct nfp_net *nn)
+{
+	u32 new_ctrl, update = 0;
+	unsigned int r;
+	int err;
+
+	new_ctrl = nn->ctrl;
+
+	if (nn->cap & NFP_NET_CFG_CTRL_RSS) {
+		nfp_net_rss_write_key(nn);
+		nfp_net_rss_write_itbl(nn);
+		nn_writel(nn, NFP_NET_CFG_RSS_CTRL, nn->rss_cfg);
+		update |= NFP_NET_CFG_UPDATE_RSS;
+	}
+
+	if (nn->cap & NFP_NET_CFG_CTRL_IRQMOD) {
+		nfp_net_coalesce_write_cfg(nn);
+
+		new_ctrl |= NFP_NET_CFG_CTRL_IRQMOD;
+		update |= NFP_NET_CFG_UPDATE_IRQMOD;
+	}
+
+	for (r = 0; r < nn->num_r_vecs; r++)
+		nfp_net_vec_write_ring_data(nn, &nn->r_vecs[r], r);
+
+	nn_writeq(nn, NFP_NET_CFG_TXRS_ENABLE, nn->num_tx_rings == 64 ?
+		  0xffffffffffffffffULL : ((u64)1 << nn->num_tx_rings) - 1);
+
+	nn_writeq(nn, NFP_NET_CFG_RXRS_ENABLE, nn->num_rx_rings == 64 ?
+		  0xffffffffffffffffULL : ((u64)1 << nn->num_rx_rings) - 1);
+
+	nfp_net_write_mac_addr(nn, nn->netdev->dev_addr);
+
+	nn_writel(nn, NFP_NET_CFG_MTU, nn->netdev->mtu);
+	nn_writel(nn, NFP_NET_CFG_FLBUFSZ, nn->fl_bufsz);
+
+	/* Enable device */
+	new_ctrl |= NFP_NET_CFG_CTRL_ENABLE;
+	update |= NFP_NET_CFG_UPDATE_GEN;
+	update |= NFP_NET_CFG_UPDATE_MSIX;
+	update |= NFP_NET_CFG_UPDATE_RING;
+	if (nn->cap & NFP_NET_CFG_CTRL_RINGCFG)
+		new_ctrl |= NFP_NET_CFG_CTRL_RINGCFG;
+
+	nn_writel(nn, NFP_NET_CFG_CTRL, new_ctrl);
+	err = nfp_net_reconfig(nn, update);
+
+	nn->ctrl = new_ctrl;
+
+	/* Since reconfiguration requests while NFP is down are ignored we
+	 * have to wipe the entire VXLAN configuration and reinitialize it.
+	 */
+	if (nn->ctrl & NFP_NET_CFG_CTRL_VXLAN) {
+		memset(&nn->vxlan_ports, 0, sizeof(nn->vxlan_ports));
+		memset(&nn->vxlan_usecnt, 0, sizeof(nn->vxlan_usecnt));
+		vxlan_get_rx_port(nn->netdev);
+	}
+
+	return err;
+}
+
+/**
+ * nfp_net_set_config_and_enable() - Write control BAR and enable NFP
+ * @nn:      NFP Net device to reconfigure
+ */
+static int nfp_net_set_config_and_enable(struct nfp_net *nn)
+{
+	int err;
+
+	err = __nfp_net_set_config_and_enable(nn);
+	if (err)
+		nfp_net_clear_config_and_disable(nn);
+
+	return err;
+}
+
 /**
  * nfp_net_start_vec() - Start ring vector
  * @nn:      NFP Net device structure
@@ -1692,20 +1768,33 @@ nfp_net_start_vec(struct nfp_net *nn, struct nfp_net_r_vector *r_vec)
 	enable_irq(irq_vec);
 }
 
+/**
+ * nfp_net_open_stack() - Start the device from stack's perspective
+ * @nn:      NFP Net device to reconfigure
+ */
+static void nfp_net_open_stack(struct nfp_net *nn)
+{
+	unsigned int r;
+
+	for (r = 0; r < nn->num_r_vecs; r++)
+		nfp_net_start_vec(nn, &nn->r_vecs[r]);
+
+	netif_tx_wake_all_queues(nn->netdev);
+
+	enable_irq(nn->irq_entries[NFP_NET_CFG_LSC].vector);
+	nfp_net_read_link_status(nn);
+}
+
 static int nfp_net_netdev_open(struct net_device *netdev)
 {
 	struct nfp_net *nn = netdev_priv(netdev);
 	int err, r;
-	u32 update = 0;
-	u32 new_ctrl;
 
 	if (nn->ctrl & NFP_NET_CFG_CTRL_ENABLE) {
 		nn_err(nn, "Dev is already enabled: 0x%08x\n", nn->ctrl);
 		return -EBUSY;
 	}
 
-	new_ctrl = nn->ctrl;
-
 	/* Step 1: Allocate resources for rings and the like
 	 * - Request interrupts
 	 * - Allocate RX and TX ring resources
@@ -1758,20 +1847,6 @@ static int nfp_net_netdev_open(struct net_device *netdev)
 	if (err)
 		goto err_free_rings;
 
-	if (nn->cap & NFP_NET_CFG_CTRL_RSS) {
-		nfp_net_rss_write_key(nn);
-		nfp_net_rss_write_itbl(nn);
-		nn_writel(nn, NFP_NET_CFG_RSS_CTRL, nn->rss_cfg);
-		update |= NFP_NET_CFG_UPDATE_RSS;
-	}
-
-	if (nn->cap & NFP_NET_CFG_CTRL_IRQMOD) {
-		nfp_net_coalesce_write_cfg(nn);
-
-		new_ctrl |= NFP_NET_CFG_CTRL_IRQMOD;
-		update |= NFP_NET_CFG_UPDATE_IRQMOD;
-	}
-
 	/* Step 2: Configure the NFP
 	 * - Enable rings from 0 to tx_rings/rx_rings - 1.
 	 * - Write MAC address (in case it changed)
@@ -1779,43 +1854,9 @@ static int nfp_net_netdev_open(struct net_device *netdev)
 	 * - Set the Freelist buffer size
 	 * - Enable the FW
 	 */
-	for (r = 0; r < nn->num_r_vecs; r++)
-		nfp_net_vec_write_ring_data(nn, &nn->r_vecs[r], r);
-
-	nn_writeq(nn, NFP_NET_CFG_TXRS_ENABLE, nn->num_tx_rings == 64 ?
-		  0xffffffffffffffffULL : ((u64)1 << nn->num_tx_rings) - 1);
-
-	nn_writeq(nn, NFP_NET_CFG_RXRS_ENABLE, nn->num_rx_rings == 64 ?
-		  0xffffffffffffffffULL : ((u64)1 << nn->num_rx_rings) - 1);
-
-	nfp_net_write_mac_addr(nn, netdev->dev_addr);
-
-	nn_writel(nn, NFP_NET_CFG_MTU, netdev->mtu);
-	nn_writel(nn, NFP_NET_CFG_FLBUFSZ, nn->fl_bufsz);
-
-	/* Enable device */
-	new_ctrl |= NFP_NET_CFG_CTRL_ENABLE;
-	update |= NFP_NET_CFG_UPDATE_GEN;
-	update |= NFP_NET_CFG_UPDATE_MSIX;
-	update |= NFP_NET_CFG_UPDATE_RING;
-	if (nn->cap & NFP_NET_CFG_CTRL_RINGCFG)
-		new_ctrl |= NFP_NET_CFG_CTRL_RINGCFG;
-
-	nn_writel(nn, NFP_NET_CFG_CTRL, new_ctrl);
-	err = nfp_net_reconfig(nn, update);
+	err = nfp_net_set_config_and_enable(nn);
 	if (err)
-		goto err_clear_config;
-
-	nn->ctrl = new_ctrl;
-
-	/* Since reconfiguration requests while NFP is down are ignored we
-	 * have to wipe the entire VXLAN configuration and reinitialize it.
-	 */
-	if (nn->ctrl & NFP_NET_CFG_CTRL_VXLAN) {
-		memset(&nn->vxlan_ports, 0, sizeof(nn->vxlan_ports));
-		memset(&nn->vxlan_usecnt, 0, sizeof(nn->vxlan_usecnt));
-		vxlan_get_rx_port(netdev);
-	}
+		goto err_free_rings;
 
 	/* Step 3: Enable for kernel
 	 * - put some freelist descriptors on each RX ring
@@ -1823,18 +1864,10 @@ static int nfp_net_netdev_open(struct net_device *netdev)
 	 * - enable all TX queues
 	 * - set link state
 	 */
-	for (r = 0; r < nn->num_r_vecs; r++)
-		nfp_net_start_vec(nn, &nn->r_vecs[r]);
-
-	netif_tx_wake_all_queues(netdev);
-
-	enable_irq(nn->irq_entries[NFP_NET_CFG_LSC].vector);
-	nfp_net_read_link_status(nn);
+	nfp_net_open_stack(nn);
 
 	return 0;
 
-err_clear_config:
-	nfp_net_clear_config_and_disable(nn);
 err_free_rings:
 	r = nn->num_r_vecs;
 err_free_prev_vecs:
@@ -1858,36 +1891,31 @@ err_free_exn:
 }
 
 /**
- * nfp_net_netdev_close() - Called when the device is downed
- * @netdev:      netdev structure
+ * nfp_net_close_stack() - Quiescent the stack (part of close)
+ * @nn:	     NFP Net device to reconfigure
  */
-static int nfp_net_netdev_close(struct net_device *netdev)
+static void nfp_net_close_stack(struct nfp_net *nn)
 {
-	struct nfp_net *nn = netdev_priv(netdev);
-	int r;
-
-	if (!(nn->ctrl & NFP_NET_CFG_CTRL_ENABLE)) {
-		nn_err(nn, "Dev is not up: 0x%08x\n", nn->ctrl);
-		return 0;
-	}
+	unsigned int r;
 
-	/* Step 1: Disable RX and TX rings from the Linux kernel perspective
-	 */
 	disable_irq(nn->irq_entries[NFP_NET_CFG_LSC].vector);
-	netif_carrier_off(netdev);
+	netif_carrier_off(nn->netdev);
 	nn->link_up = false;
 
 	for (r = 0; r < nn->num_r_vecs; r++)
 		napi_disable(&nn->r_vecs[r].napi);
 
-	netif_tx_disable(netdev);
+	netif_tx_disable(nn->netdev);
+}
 
-	/* Step 2: Tell NFP
-	 */
-	nfp_net_clear_config_and_disable(nn);
+/**
+ * nfp_net_close_free_all() - Free all runtime resources
+ * @nn:      NFP Net device to reconfigure
+ */
+static void nfp_net_close_free_all(struct nfp_net *nn)
+{
+	unsigned int r;
 
-	/* Step 3: Free resources
-	 */
 	for (r = 0; r < nn->num_r_vecs; r++) {
 		nfp_net_rx_ring_reset(nn->r_vecs[r].rx_ring);
 		nfp_net_rx_ring_bufs_free(nn, nn->r_vecs[r].rx_ring);
@@ -1902,6 +1930,32 @@ static int nfp_net_netdev_close(struct net_device *netdev)
 
 	nfp_net_aux_irq_free(nn, NFP_NET_CFG_LSC, NFP_NET_IRQ_LSC_IDX);
 	nfp_net_aux_irq_free(nn, NFP_NET_CFG_EXN, NFP_NET_IRQ_EXN_IDX);
+}
+
+/**
+ * nfp_net_netdev_close() - Called when the device is downed
+ * @netdev:      netdev structure
+ */
+static int nfp_net_netdev_close(struct net_device *netdev)
+{
+	struct nfp_net *nn = netdev_priv(netdev);
+
+	if (!(nn->ctrl & NFP_NET_CFG_CTRL_ENABLE)) {
+		nn_err(nn, "Dev is not up: 0x%08x\n", nn->ctrl);
+		return 0;
+	}
+
+	/* Step 1: Disable RX and TX rings from the Linux kernel perspective
+	 */
+	nfp_net_close_stack(nn);
+
+	/* Step 2: Tell NFP
+	 */
+	nfp_net_clear_config_and_disable(nn);
+
+	/* Step 3: Free resources
+	 */
+	nfp_net_close_free_all(nn);
 
 	nn_dbg(nn, "%s down", netdev->name);
 	return 0;
-- 
1.9.1

[PATCH v5 net-next 11/15] nfp: sync ring state during FW reconfiguration

[Jakub Kicinski]

FW reconfiguration in .ndo_open()/.ndo_stop() should reset/
restore queue state.  Since we need IRQs to be disabled when
filling rings on RX path we have to move disable_irq() from
.ndo_open() all the way up to IRQ allocation.

nfp_net_start_vec() becomes trivial now so it's inlined.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
---
 .../net/ethernet/netronome/nfp/nfp_net_common.c    | 45 ++++++++--------------
 1 file changed, 16 insertions(+), 29 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index 6c1ed8914416..ed23b9d348c3 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -1519,6 +1519,7 @@ nfp_net_prepare_vector(struct nfp_net *nn, struct nfp_net_r_vector *r_vec,
 		nn_err(nn, "Error requesting IRQ %d\n", entry->vector);
 		return err;
 	}
+	disable_irq(entry->vector);
 
 	/* Setup NAPI */
 	netif_napi_add(nn->netdev, &r_vec->napi,
@@ -1647,13 +1648,14 @@ static void nfp_net_clear_config_and_disable(struct nfp_net *nn)
 
 	nn_writel(nn, NFP_NET_CFG_CTRL, new_ctrl);
 	err = nfp_net_reconfig(nn, update);
-	if (err) {
+	if (err)
 		nn_err(nn, "Could not disable device: %d\n", err);
-		return;
-	}
 
-	for (r = 0; r < nn->num_r_vecs; r++)
+	for (r = 0; r < nn->num_r_vecs; r++) {
+		nfp_net_rx_ring_reset(nn->r_vecs[r].rx_ring);
+		nfp_net_tx_ring_reset(nn, nn->r_vecs[r].tx_ring);
 		nfp_net_vec_clear_ring_data(nn, r);
+	}
 
 	nn->ctrl = new_ctrl;
 }
@@ -1721,6 +1723,9 @@ static int __nfp_net_set_config_and_enable(struct nfp_net *nn)
 
 	nn->ctrl = new_ctrl;
 
+	for (r = 0; r < nn->num_r_vecs; r++)
+		nfp_net_rx_ring_fill_freelist(nn->r_vecs[r].rx_ring);
+
 	/* Since reconfiguration requests while NFP is down are ignored we
 	 * have to wipe the entire VXLAN configuration and reinitialize it.
 	 */
@@ -1749,26 +1754,6 @@ static int nfp_net_set_config_and_enable(struct nfp_net *nn)
 }
 
 /**
- * nfp_net_start_vec() - Start ring vector
- * @nn:      NFP Net device structure
- * @r_vec:   Ring vector to be started
- */
-static void
-nfp_net_start_vec(struct nfp_net *nn, struct nfp_net_r_vector *r_vec)
-{
-	unsigned int irq_vec;
-
-	irq_vec = nn->irq_entries[r_vec->irq_idx].vector;
-
-	disable_irq(irq_vec);
-
-	nfp_net_rx_ring_fill_freelist(r_vec->rx_ring);
-	napi_enable(&r_vec->napi);
-
-	enable_irq(irq_vec);
-}
-
-/**
  * nfp_net_open_stack() - Start the device from stack's perspective
  * @nn:      NFP Net device to reconfigure
  */
@@ -1776,8 +1761,10 @@ static void nfp_net_open_stack(struct nfp_net *nn)
 {
 	unsigned int r;
 
-	for (r = 0; r < nn->num_r_vecs; r++)
-		nfp_net_start_vec(nn, &nn->r_vecs[r]);
+	for (r = 0; r < nn->num_r_vecs; r++) {
+		napi_enable(&nn->r_vecs[r].napi);
+		enable_irq(nn->irq_entries[nn->r_vecs[r].irq_idx].vector);
+	}
 
 	netif_tx_wake_all_queues(nn->netdev);
 
@@ -1902,8 +1889,10 @@ static void nfp_net_close_stack(struct nfp_net *nn)
 	netif_carrier_off(nn->netdev);
 	nn->link_up = false;
 
-	for (r = 0; r < nn->num_r_vecs; r++)
+	for (r = 0; r < nn->num_r_vecs; r++) {
+		disable_irq(nn->irq_entries[nn->r_vecs[r].irq_idx].vector);
 		napi_disable(&nn->r_vecs[r].napi);
+	}
 
 	netif_tx_disable(nn->netdev);
 }
@@ -1917,9 +1906,7 @@ static void nfp_net_close_free_all(struct nfp_net *nn)
 	unsigned int r;
 
 	for (r = 0; r < nn->num_r_vecs; r++) {
-		nfp_net_rx_ring_reset(nn->r_vecs[r].rx_ring);
 		nfp_net_rx_ring_bufs_free(nn, nn->r_vecs[r].rx_ring);
-		nfp_net_tx_ring_reset(nn, nn->r_vecs[r].tx_ring);
 		nfp_net_rx_ring_free(nn->r_vecs[r].rx_ring);
 		nfp_net_tx_ring_free(nn->r_vecs[r].tx_ring);
 		nfp_net_cleanup_vector(nn, &nn->r_vecs[r]);
-- 
1.9.1

[PATCH v5 net-next 12/15] nfp: propagate list buffer size in struct rx_ring

[Jakub Kicinski]

Free list buffer size needs to be propagated to few functions
as a parameter and added to struct nfp_net_rx_ring since soon
some of the functions will be reused to manage rings with
buffers of size different than nn->fl_bufsz.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
---
 drivers/net/ethernet/netronome/nfp/nfp_net.h       |  3 +++
 .../net/ethernet/netronome/nfp/nfp_net_common.c    | 24 ++++++++++++++--------
 2 files changed, 19 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net.h b/drivers/net/ethernet/netronome/nfp/nfp_net.h
index fc005c982b7d..9ab8e3967dc9 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net.h
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net.h
@@ -298,6 +298,8 @@ struct nfp_net_rx_buf {
  * @rxds:       Virtual address of FL/RX ring in host memory
  * @dma:        DMA address of the FL/RX ring
  * @size:       Size, in bytes, of the FL/RX ring (needed to free)
+ * @bufsz:	Buffer allocation size for convenience of management routines
+ *		(NOTE: this is in second cache line, do not use on fast path!)
  */
 struct nfp_net_rx_ring {
 	struct nfp_net_r_vector *r_vec;
@@ -319,6 +321,7 @@ struct nfp_net_rx_ring {
 
 	dma_addr_t dma;
 	unsigned int size;
+	unsigned int bufsz;
 } ____cacheline_aligned;
 
 /**
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index ed23b9d348c3..03c60f755de0 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -957,25 +957,27 @@ static inline int nfp_net_rx_space(struct nfp_net_rx_ring *rx_ring)
  * nfp_net_rx_alloc_one() - Allocate and map skb for RX
  * @rx_ring:	RX ring structure of the skb
  * @dma_addr:	Pointer to storage for DMA address (output param)
+ * @fl_bufsz:	size of freelist buffers
  *
  * This function will allcate a new skb, map it for DMA.
  *
  * Return: allocated skb or NULL on failure.
  */
 static struct sk_buff *
-nfp_net_rx_alloc_one(struct nfp_net_rx_ring *rx_ring, dma_addr_t *dma_addr)
+nfp_net_rx_alloc_one(struct nfp_net_rx_ring *rx_ring, dma_addr_t *dma_addr,
+		     unsigned int fl_bufsz)
 {
 	struct nfp_net *nn = rx_ring->r_vec->nfp_net;
 	struct sk_buff *skb;
 
-	skb = netdev_alloc_skb(nn->netdev, nn->fl_bufsz);
+	skb = netdev_alloc_skb(nn->netdev, fl_bufsz);
 	if (!skb) {
 		nn_warn_ratelimit(nn, "Failed to alloc receive SKB\n");
 		return NULL;
 	}
 
 	*dma_addr = dma_map_single(&nn->pdev->dev, skb->data,
-				  nn->fl_bufsz, DMA_FROM_DEVICE);
+				   fl_bufsz, DMA_FROM_DEVICE);
 	if (dma_mapping_error(&nn->pdev->dev, *dma_addr)) {
 		dev_kfree_skb_any(skb);
 		nn_warn_ratelimit(nn, "Failed to map DMA RX buffer\n");
@@ -1068,7 +1070,7 @@ nfp_net_rx_ring_bufs_free(struct nfp_net *nn, struct nfp_net_rx_ring *rx_ring)
 			continue;
 
 		dma_unmap_single(&pdev->dev, rx_ring->rxbufs[i].dma_addr,
-				 nn->fl_bufsz, DMA_FROM_DEVICE);
+				 rx_ring->bufsz, DMA_FROM_DEVICE);
 		dev_kfree_skb_any(rx_ring->rxbufs[i].skb);
 		rx_ring->rxbufs[i].dma_addr = 0;
 		rx_ring->rxbufs[i].skb = NULL;
@@ -1090,7 +1092,8 @@ nfp_net_rx_ring_bufs_alloc(struct nfp_net *nn, struct nfp_net_rx_ring *rx_ring)
 
 	for (i = 0; i < rx_ring->cnt - 1; i++) {
 		rxbufs[i].skb =
-			nfp_net_rx_alloc_one(rx_ring, &rxbufs[i].dma_addr);
+			nfp_net_rx_alloc_one(rx_ring, &rxbufs[i].dma_addr,
+					     rx_ring->bufsz);
 		if (!rxbufs[i].skb) {
 			nfp_net_rx_ring_bufs_free(nn, rx_ring);
 			return -ENOMEM;
@@ -1278,7 +1281,8 @@ static int nfp_net_rx(struct nfp_net_rx_ring *rx_ring, int budget)
 
 		skb = rx_ring->rxbufs[idx].skb;
 
-		new_skb = nfp_net_rx_alloc_one(rx_ring, &new_dma_addr);
+		new_skb = nfp_net_rx_alloc_one(rx_ring, &new_dma_addr,
+					       nn->fl_bufsz);
 		if (!new_skb) {
 			nfp_net_rx_give_one(rx_ring, rx_ring->rxbufs[idx].skb,
 					    rx_ring->rxbufs[idx].dma_addr);
@@ -1465,10 +1469,12 @@ static void nfp_net_rx_ring_free(struct nfp_net_rx_ring *rx_ring)
 /**
  * nfp_net_rx_ring_alloc() - Allocate resource for a RX ring
  * @rx_ring:  RX ring to allocate
+ * @fl_bufsz: Size of buffers to allocate
  *
  * Return: 0 on success, negative errno otherwise.
  */
-static int nfp_net_rx_ring_alloc(struct nfp_net_rx_ring *rx_ring)
+static int
+nfp_net_rx_ring_alloc(struct nfp_net_rx_ring *rx_ring, unsigned int fl_bufsz)
 {
 	struct nfp_net_r_vector *r_vec = rx_ring->r_vec;
 	struct nfp_net *nn = r_vec->nfp_net;
@@ -1476,6 +1482,7 @@ static int nfp_net_rx_ring_alloc(struct nfp_net_rx_ring *rx_ring)
 	int sz;
 
 	rx_ring->cnt = nn->rxd_cnt;
+	rx_ring->bufsz = fl_bufsz;
 
 	rx_ring->size = sizeof(*rx_ring->rxds) * rx_ring->cnt;
 	rx_ring->rxds = dma_zalloc_coherent(&pdev->dev, rx_ring->size,
@@ -1817,7 +1824,8 @@ static int nfp_net_netdev_open(struct net_device *netdev)
 		if (err)
 			goto err_cleanup_vec_p;
 
-		err = nfp_net_rx_ring_alloc(nn->r_vecs[r].rx_ring);
+		err = nfp_net_rx_ring_alloc(nn->r_vecs[r].rx_ring,
+					    nn->fl_bufsz);
 		if (err)
 			goto err_free_tx_ring_p;
 
-- 
1.9.1

[PATCH v5 net-next 13/15] nfp: convert .ndo_change_mtu() to prepare/commit paradigm

[Jakub Kicinski]

When changing MTU on running device first allocate new rings
and buffers and once it succeeds proceed with changing MTU.

Allocation of new rings is not really necessary for this
operation - it's done to keep the code simple and because
size of the extra ring memory is quite small compared to
the size of buffers.

Operation can still fail midway through if FW communication
times out.  In that case we retry with old MTU (rings).

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
---
 .../net/ethernet/netronome/nfp/nfp_net_common.c    | 108 +++++++++++++++++++--
 1 file changed, 102 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index 03c60f755de0..e7c420fdcb0d 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -1506,6 +1506,64 @@ err_alloc:
 	return -ENOMEM;
 }
 
+static struct nfp_net_rx_ring *
+nfp_net_shadow_rx_rings_prepare(struct nfp_net *nn, unsigned int fl_bufsz)
+{
+	struct nfp_net_rx_ring *rings;
+	unsigned int r;
+
+	rings = kcalloc(nn->num_rx_rings, sizeof(*rings), GFP_KERNEL);
+	if (!rings)
+		return NULL;
+
+	for (r = 0; r < nn->num_rx_rings; r++) {
+		nfp_net_rx_ring_init(&rings[r], nn->rx_rings[r].r_vec, r);
+
+		if (nfp_net_rx_ring_alloc(&rings[r], fl_bufsz))
+			goto err_free_prev;
+
+		if (nfp_net_rx_ring_bufs_alloc(nn, &rings[r]))
+			goto err_free_ring;
+	}
+
+	return rings;
+
+err_free_prev:
+	while (r--) {
+		nfp_net_rx_ring_bufs_free(nn, &rings[r]);
+err_free_ring:
+		nfp_net_rx_ring_free(&rings[r]);
+	}
+	kfree(rings);
+	return NULL;
+}
+
+static struct nfp_net_rx_ring *
+nfp_net_shadow_rx_rings_swap(struct nfp_net *nn, struct nfp_net_rx_ring *rings)
+{
+	struct nfp_net_rx_ring *old = nn->rx_rings;
+	unsigned int r;
+
+	for (r = 0; r < nn->num_rx_rings; r++)
+		old[r].r_vec->rx_ring = &rings[r];
+
+	nn->rx_rings = rings;
+	return old;
+}
+
+static void
+nfp_net_shadow_rx_rings_free(struct nfp_net *nn, struct nfp_net_rx_ring *rings)
+{
+	unsigned int r;
+
+	for (r = 0; r < nn->num_r_vecs; r++) {
+		nfp_net_rx_ring_bufs_free(nn, &rings[r]);
+		nfp_net_rx_ring_free(&rings[r]);
+	}
+
+	kfree(rings);
+}
+
 static int
 nfp_net_prepare_vector(struct nfp_net *nn, struct nfp_net_r_vector *r_vec,
 		       int idx)
@@ -1984,23 +2042,61 @@ static void nfp_net_set_rx_mode(struct net_device *netdev)
 
 static int nfp_net_change_mtu(struct net_device *netdev, int new_mtu)
 {
+	unsigned int old_mtu, old_fl_bufsz, new_fl_bufsz;
 	struct nfp_net *nn = netdev_priv(netdev);
+	struct nfp_net_rx_ring *tmp_rings;
+	int err;
 
 	if (new_mtu < 68 || new_mtu > nn->max_mtu) {
 		nn_err(nn, "New MTU (%d) is not valid\n", new_mtu);
 		return -EINVAL;
 	}
 
+	old_mtu = netdev->mtu;
+	old_fl_bufsz = nn->fl_bufsz;
+	new_fl_bufsz = NFP_NET_MAX_PREPEND + ETH_HLEN + VLAN_HLEN * 2 + new_mtu;
+
+	if (!netif_running(netdev)) {
+		netdev->mtu = new_mtu;
+		nn->fl_bufsz = new_fl_bufsz;
+		return 0;
+	}
+
+	/* Prepare new rings */
+	tmp_rings = nfp_net_shadow_rx_rings_prepare(nn, new_fl_bufsz);
+	if (!tmp_rings)
+		return -ENOMEM;
+
+	/* Stop device, swap in new rings, try to start the firmware */
+	nfp_net_close_stack(nn);
+	nfp_net_clear_config_and_disable(nn);
+
+	tmp_rings = nfp_net_shadow_rx_rings_swap(nn, tmp_rings);
+
 	netdev->mtu = new_mtu;
-	nn->fl_bufsz = NFP_NET_MAX_PREPEND + ETH_HLEN + VLAN_HLEN * 2 + new_mtu;
+	nn->fl_bufsz = new_fl_bufsz;
+
+	err = nfp_net_set_config_and_enable(nn);
+	if (err) {
+		const int err_new = err;
+
+		/* Try with old configuration and old rings */
+		tmp_rings = nfp_net_shadow_rx_rings_swap(nn, tmp_rings);
+
+		netdev->mtu = old_mtu;
+		nn->fl_bufsz = old_fl_bufsz;
 
-	/* restart if running */
-	if (netif_running(netdev)) {
-		nfp_net_netdev_close(netdev);
-		nfp_net_netdev_open(netdev);
+		err = __nfp_net_set_config_and_enable(nn);
+		if (err)
+			nn_err(nn, "Can't restore MTU - FW communication failed (%d,%d)\n",
+			       err_new, err);
 	}
 
-	return 0;
+	nfp_net_shadow_rx_rings_free(nn, tmp_rings);
+
+	nfp_net_open_stack(nn);
+
+	return err;
 }
 
 static struct rtnl_link_stats64 *nfp_net_stat64(struct net_device *netdev,
-- 
1.9.1

[PATCH v5 net-next 14/15] nfp: pass ring count as function parameter

[Jakub Kicinski]

Soon ring resize will call this functions with values
different than the current configuration we need to
explicitly pass the ring count as parameter.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
---
 .../net/ethernet/netronome/nfp/nfp_net_common.c    | 23 +++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index e7c420fdcb0d..c4f0c70e77ce 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -1407,17 +1407,18 @@ static void nfp_net_tx_ring_free(struct nfp_net_tx_ring *tx_ring)
 /**
  * nfp_net_tx_ring_alloc() - Allocate resource for a TX ring
  * @tx_ring:   TX Ring structure to allocate
+ * @cnt:       Ring buffer count
  *
  * Return: 0 on success, negative errno otherwise.
  */
-static int nfp_net_tx_ring_alloc(struct nfp_net_tx_ring *tx_ring)
+static int nfp_net_tx_ring_alloc(struct nfp_net_tx_ring *tx_ring, u32 cnt)
 {
 	struct nfp_net_r_vector *r_vec = tx_ring->r_vec;
 	struct nfp_net *nn = r_vec->nfp_net;
 	struct pci_dev *pdev = nn->pdev;
 	int sz;
 
-	tx_ring->cnt = nn->txd_cnt;
+	tx_ring->cnt = cnt;
 
 	tx_ring->size = sizeof(*tx_ring->txds) * tx_ring->cnt;
 	tx_ring->txds = dma_zalloc_coherent(&pdev->dev, tx_ring->size,
@@ -1470,18 +1471,20 @@ static void nfp_net_rx_ring_free(struct nfp_net_rx_ring *rx_ring)
  * nfp_net_rx_ring_alloc() - Allocate resource for a RX ring
  * @rx_ring:  RX ring to allocate
  * @fl_bufsz: Size of buffers to allocate
+ * @cnt:      Ring buffer count
  *
  * Return: 0 on success, negative errno otherwise.
  */
 static int
-nfp_net_rx_ring_alloc(struct nfp_net_rx_ring *rx_ring, unsigned int fl_bufsz)
+nfp_net_rx_ring_alloc(struct nfp_net_rx_ring *rx_ring, unsigned int fl_bufsz,
+		      u32 cnt)
 {
 	struct nfp_net_r_vector *r_vec = rx_ring->r_vec;
 	struct nfp_net *nn = r_vec->nfp_net;
 	struct pci_dev *pdev = nn->pdev;
 	int sz;
 
-	rx_ring->cnt = nn->rxd_cnt;
+	rx_ring->cnt = cnt;
 	rx_ring->bufsz = fl_bufsz;
 
 	rx_ring->size = sizeof(*rx_ring->rxds) * rx_ring->cnt;
@@ -1507,7 +1510,8 @@ err_alloc:
 }
 
 static struct nfp_net_rx_ring *
-nfp_net_shadow_rx_rings_prepare(struct nfp_net *nn, unsigned int fl_bufsz)
+nfp_net_shadow_rx_rings_prepare(struct nfp_net *nn, unsigned int fl_bufsz,
+				u32 buf_cnt)
 {
 	struct nfp_net_rx_ring *rings;
 	unsigned int r;
@@ -1519,7 +1523,7 @@ nfp_net_shadow_rx_rings_prepare(struct nfp_net *nn, unsigned int fl_bufsz)
 	for (r = 0; r < nn->num_rx_rings; r++) {
 		nfp_net_rx_ring_init(&rings[r], nn->rx_rings[r].r_vec, r);
 
-		if (nfp_net_rx_ring_alloc(&rings[r], fl_bufsz))
+		if (nfp_net_rx_ring_alloc(&rings[r], fl_bufsz, buf_cnt))
 			goto err_free_prev;
 
 		if (nfp_net_rx_ring_bufs_alloc(nn, &rings[r]))
@@ -1878,12 +1882,12 @@ static int nfp_net_netdev_open(struct net_device *netdev)
 		if (err)
 			goto err_free_prev_vecs;
 
-		err = nfp_net_tx_ring_alloc(nn->r_vecs[r].tx_ring);
+		err = nfp_net_tx_ring_alloc(nn->r_vecs[r].tx_ring, nn->txd_cnt);
 		if (err)
 			goto err_cleanup_vec_p;
 
 		err = nfp_net_rx_ring_alloc(nn->r_vecs[r].rx_ring,
-					    nn->fl_bufsz);
+					    nn->fl_bufsz, nn->rxd_cnt);
 		if (err)
 			goto err_free_tx_ring_p;
 
@@ -2063,7 +2067,8 @@ static int nfp_net_change_mtu(struct net_device *netdev, int new_mtu)
 	}
 
 	/* Prepare new rings */
-	tmp_rings = nfp_net_shadow_rx_rings_prepare(nn, new_fl_bufsz);
+	tmp_rings = nfp_net_shadow_rx_rings_prepare(nn, new_fl_bufsz,
+						    nn->rxd_cnt);
 	if (!tmp_rings)
 		return -ENOMEM;
 
-- 
1.9.1

[PATCH v5 net-next 15/15] nfp: allow ring size reconfiguration at runtime

[Jakub Kicinski]

Since much of the required changes have already been made for
changing MTU at runtime let's use it for ring size changes as
well.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
---
 drivers/net/ethernet/netronome/nfp/nfp_net.h       |   1 +
 .../net/ethernet/netronome/nfp/nfp_net_common.c    | 126 +++++++++++++++++++++
 .../net/ethernet/netronome/nfp/nfp_net_ethtool.c   |  30 ++---
 3 files changed, 136 insertions(+), 21 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net.h b/drivers/net/ethernet/netronome/nfp/nfp_net.h
index 9ab8e3967dc9..3d53fcf323eb 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net.h
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net.h
@@ -724,6 +724,7 @@ void nfp_net_rss_write_key(struct nfp_net *nn);
 void nfp_net_coalesce_write_cfg(struct nfp_net *nn);
 int nfp_net_irqs_alloc(struct nfp_net *nn);
 void nfp_net_irqs_disable(struct nfp_net *nn);
+int nfp_net_set_ring_size(struct nfp_net *nn, u32 rxd_cnt, u32 txd_cnt);
 
 #ifdef CONFIG_NFP_NET_DEBUG
 void nfp_net_debugfs_create(void);
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index c4f0c70e77ce..0bdff390c958 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -1444,6 +1444,59 @@ err_alloc:
 	return -ENOMEM;
 }
 
+static struct nfp_net_tx_ring *
+nfp_net_shadow_tx_rings_prepare(struct nfp_net *nn, u32 buf_cnt)
+{
+	struct nfp_net_tx_ring *rings;
+	unsigned int r;
+
+	rings = kcalloc(nn->num_tx_rings, sizeof(*rings), GFP_KERNEL);
+	if (!rings)
+		return NULL;
+
+	for (r = 0; r < nn->num_tx_rings; r++) {
+		nfp_net_tx_ring_init(&rings[r], nn->tx_rings[r].r_vec, r);
+
+		if (nfp_net_tx_ring_alloc(&rings[r], buf_cnt))
+			goto err_free_prev;
+	}
+
+	return rings;
+
+err_free_prev:
+	while (r--)
+		nfp_net_tx_ring_free(&rings[r]);
+	kfree(rings);
+	return NULL;
+}
+
+static struct nfp_net_tx_ring *
+nfp_net_shadow_tx_rings_swap(struct nfp_net *nn, struct nfp_net_tx_ring *rings)
+{
+	struct nfp_net_tx_ring *old = nn->tx_rings;
+	unsigned int r;
+
+	for (r = 0; r < nn->num_tx_rings; r++)
+		old[r].r_vec->tx_ring = &rings[r];
+
+	nn->tx_rings = rings;
+	return old;
+}
+
+static void
+nfp_net_shadow_tx_rings_free(struct nfp_net *nn, struct nfp_net_tx_ring *rings)
+{
+	unsigned int r;
+
+	if (!rings)
+		return;
+
+	for (r = 0; r < nn->num_tx_rings; r++)
+		nfp_net_tx_ring_free(&rings[r]);
+
+	kfree(rings);
+}
+
 /**
  * nfp_net_rx_ring_free() - Free resources allocated to a RX ring
  * @rx_ring:  RX ring to free
@@ -1560,6 +1613,9 @@ nfp_net_shadow_rx_rings_free(struct nfp_net *nn, struct nfp_net_rx_ring *rings)
 {
 	unsigned int r;
 
+	if (!rings)
+		return;
+
 	for (r = 0; r < nn->num_r_vecs; r++) {
 		nfp_net_rx_ring_bufs_free(nn, &rings[r]);
 		nfp_net_rx_ring_free(&rings[r]);
@@ -2104,6 +2160,76 @@ static int nfp_net_change_mtu(struct net_device *netdev, int new_mtu)
 	return err;
 }
 
+int nfp_net_set_ring_size(struct nfp_net *nn, u32 rxd_cnt, u32 txd_cnt)
+{
+	struct nfp_net_tx_ring *tx_rings = NULL;
+	struct nfp_net_rx_ring *rx_rings = NULL;
+	u32 old_rxd_cnt, old_txd_cnt;
+	int err;
+
+	if (!netif_running(nn->netdev)) {
+		nn->rxd_cnt = rxd_cnt;
+		nn->txd_cnt = txd_cnt;
+		return 0;
+	}
+
+	old_rxd_cnt = nn->rxd_cnt;
+	old_txd_cnt = nn->txd_cnt;
+
+	/* Prepare new rings */
+	if (nn->rxd_cnt != rxd_cnt) {
+		rx_rings = nfp_net_shadow_rx_rings_prepare(nn, nn->fl_bufsz,
+							   rxd_cnt);
+		if (!rx_rings)
+			return -ENOMEM;
+	}
+	if (nn->txd_cnt != txd_cnt) {
+		tx_rings = nfp_net_shadow_tx_rings_prepare(nn, txd_cnt);
+		if (!tx_rings) {
+			nfp_net_shadow_rx_rings_free(nn, rx_rings);
+			return -ENOMEM;
+		}
+	}
+
+	/* Stop device, swap in new rings, try to start the firmware */
+	nfp_net_close_stack(nn);
+	nfp_net_clear_config_and_disable(nn);
+
+	if (rx_rings)
+		rx_rings = nfp_net_shadow_rx_rings_swap(nn, rx_rings);
+	if (tx_rings)
+		tx_rings = nfp_net_shadow_tx_rings_swap(nn, tx_rings);
+
+	nn->rxd_cnt = rxd_cnt;
+	nn->txd_cnt = txd_cnt;
+
+	err = nfp_net_set_config_and_enable(nn);
+	if (err) {
+		const int err_new = err;
+
+		/* Try with old configuration and old rings */
+		if (rx_rings)
+			rx_rings = nfp_net_shadow_rx_rings_swap(nn, rx_rings);
+		if (tx_rings)
+			tx_rings = nfp_net_shadow_tx_rings_swap(nn, tx_rings);
+
+		nn->rxd_cnt = old_rxd_cnt;
+		nn->txd_cnt = old_txd_cnt;
+
+		err = __nfp_net_set_config_and_enable(nn);
+		if (err)
+			nn_err(nn, "Can't restore ring config - FW communication failed (%d,%d)\n",
+			       err_new, err);
+	}
+
+	nfp_net_shadow_rx_rings_free(nn, rx_rings);
+	nfp_net_shadow_tx_rings_free(nn, tx_rings);
+
+	nfp_net_open_stack(nn);
+
+	return err;
+}
+
 static struct rtnl_link_stats64 *nfp_net_stat64(struct net_device *netdev,
 						struct rtnl_link_stats64 *stats)
 {
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c b/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
index 9a4084a68db5..ccfef1f17627 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
@@ -153,37 +153,25 @@ static int nfp_net_set_ringparam(struct net_device *netdev,
 	struct nfp_net *nn = netdev_priv(netdev);
 	u32 rxd_cnt, txd_cnt;
 
-	if (netif_running(netdev)) {
-		/* Some NIC drivers allow reconfiguration on the fly,
-		 * some down the interface, change and then up it
-		 * again.  For now we don't allow changes when the
-		 * device is up.
-		 */
-		nn_warn(nn, "Can't change rings while device is up\n");
-		return -EBUSY;
-	}
-
 	/* We don't have separate queues/rings for small/large frames. */
 	if (ring->rx_mini_pending || ring->rx_jumbo_pending)
 		return -EINVAL;
 
 	/* Round up to supported values */
 	rxd_cnt = roundup_pow_of_two(ring->rx_pending);
-	rxd_cnt = max_t(u32, rxd_cnt, NFP_NET_MIN_RX_DESCS);
-	rxd_cnt = min_t(u32, rxd_cnt, NFP_NET_MAX_RX_DESCS);
-
 	txd_cnt = roundup_pow_of_two(ring->tx_pending);
-	txd_cnt = max_t(u32, txd_cnt, NFP_NET_MIN_TX_DESCS);
-	txd_cnt = min_t(u32, txd_cnt, NFP_NET_MAX_TX_DESCS);
 
-	if (nn->rxd_cnt != rxd_cnt || nn->txd_cnt != txd_cnt)
-		nn_dbg(nn, "Change ring size: RxQ %u->%u, TxQ %u->%u\n",
-		       nn->rxd_cnt, rxd_cnt, nn->txd_cnt, txd_cnt);
+	if (rxd_cnt < NFP_NET_MIN_RX_DESCS || rxd_cnt > NFP_NET_MAX_RX_DESCS ||
+	    txd_cnt < NFP_NET_MIN_TX_DESCS || txd_cnt > NFP_NET_MAX_TX_DESCS)
+		return -EINVAL;
 
-	nn->rxd_cnt = rxd_cnt;
-	nn->txd_cnt = txd_cnt;
+	if (nn->rxd_cnt == rxd_cnt && nn->txd_cnt == txd_cnt)
+		return 0;
 
-	return 0;
+	nn_dbg(nn, "Change ring size: RxQ %u->%u, TxQ %u->%u\n",
+	       nn->rxd_cnt, rxd_cnt, nn->txd_cnt, txd_cnt);
+
+	return nfp_net_set_ring_size(nn, rxd_cnt, txd_cnt);
 }
 
 static void nfp_net_get_strings(struct net_device *netdev,
-- 
1.9.1

Re: [PATCH v5 net-next 00/15] MTU/buffer reconfig changes

[David Miller]

From: Jakub Kicinski <jakub.kicinski@netronome.com>
Date: Thu,  7 Apr 2016 19:39:33 +0100

> I re-discussed MPLS/MTU internally, dropped it from the patch 1,
> re-tested everything, found out I forgot about debugfs pointers,
> fixed that as well.
> 
> v5:
>  - don't reserve space in RX buffers for MPLS label stack
>    (patch 1);
>  - fix debugfs pointers to ring structures (patch 5).
> v4:
>  - cut down on unrelated patches;
>  - don't "close" the device on error path.
> 
> --- v4 cover letter
> 
> Previous series included some not entirely related patches,
> this one is cut down.  Main issue I'm trying to solve here
> is that .ndo_change_mtu() in nfpvf driver is doing full
> close/open to reallocate buffers - which if open fails
> can result in device being basically closed even though
> the interface is started.  As suggested by you I try to move
> towards a paradigm where the resources are allocated first
> and the MTU change is only done once I'm certain (almost)
> nothing can fail.  Almost because I need to communicate 
> with FW and that can always time out.
> 
> Patch 1 fixes small issue.  Next 10 patches reorganize things
> so that I can easily allocate new rings and sets of buffers
> while the device is running.  Patches 13 and 15 reshape the
> .ndo_change_mtu() and ethtool's ring-resize operation into
> desired form.

Looks good, series applied, thanks!