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Date: Fri, 10 Feb 2023 16:50:17 -0800
From: Shannon Nelson <shannon.nelson@....com>
To: <netdev@...r.kernel.org>, <davem@...emloft.net>, <kuba@...nel.org>
CC: <drivers@...sando.io>, Shannon Nelson <shannon.nelson@....com>
Subject: [PATCH v4 net-next 4/4] ionic: add tx/rx-push support with device Component Memory Buffers
The ionic device has on-board memory (CMB) that can be used
for descriptors as a way to speed descriptor access for faster
packet processing. It is rumored to improve latency and/or
packets-per-second for some profiles of small packet traffic,
although your mileage may vary.
Signed-off-by: Shannon Nelson <shannon.nelson@....com>
---
.../ethernet/pensando/ionic/ionic_bus_pci.c | 2 +
.../net/ethernet/pensando/ionic/ionic_dev.c | 67 ++++++++
.../net/ethernet/pensando/ionic/ionic_dev.h | 13 ++
.../ethernet/pensando/ionic/ionic_ethtool.c | 117 ++++++++++++-
.../net/ethernet/pensando/ionic/ionic_if.h | 3 +-
.../net/ethernet/pensando/ionic/ionic_lif.c | 161 ++++++++++++++++--
.../net/ethernet/pensando/ionic/ionic_lif.h | 40 ++++-
.../net/ethernet/pensando/ionic/ionic_txrx.c | 22 ++-
8 files changed, 404 insertions(+), 21 deletions(-)
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_bus_pci.c b/drivers/net/ethernet/pensando/ionic/ionic_bus_pci.c
index 0eff78fa0565..e508f8eb43bf 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_bus_pci.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_bus_pci.c
@@ -352,6 +352,7 @@ static int ionic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
err_out_reset:
ionic_reset(ionic);
err_out_teardown:
+ ionic_dev_teardown(ionic);
pci_clear_master(pdev);
/* Don't fail the probe for these errors, keep
* the hw interface around for inspection
@@ -390,6 +391,7 @@ static void ionic_remove(struct pci_dev *pdev)
ionic_port_reset(ionic);
ionic_reset(ionic);
+ ionic_dev_teardown(ionic);
pci_clear_master(pdev);
ionic_unmap_bars(ionic);
pci_release_regions(pdev);
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_dev.c b/drivers/net/ethernet/pensando/ionic/ionic_dev.c
index 626b9113e7c4..9c2be75ffbab 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_dev.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_dev.c
@@ -92,6 +92,7 @@ int ionic_dev_setup(struct ionic *ionic)
unsigned int num_bars = ionic->num_bars;
struct ionic_dev *idev = &ionic->idev;
struct device *dev = ionic->dev;
+ int size;
u32 sig;
/* BAR0: dev_cmd and interrupts */
@@ -133,9 +134,36 @@ int ionic_dev_setup(struct ionic *ionic)
idev->db_pages = bar->vaddr;
idev->phy_db_pages = bar->bus_addr;
+ /* BAR2: optional controller memory mapping */
+ bar++;
+ mutex_init(&idev->cmb_inuse_lock);
+ if (num_bars < 3 || !ionic->bars[IONIC_PCI_BAR_CMB].len) {
+ idev->cmb_inuse = NULL;
+ return 0;
+ }
+
+ idev->phy_cmb_pages = bar->bus_addr;
+ idev->cmb_npages = bar->len / PAGE_SIZE;
+ size = BITS_TO_LONGS(idev->cmb_npages) * sizeof(long);
+ idev->cmb_inuse = kzalloc(size, GFP_KERNEL);
+ if (!idev->cmb_inuse)
+ dev_warn(dev, "No memory for CMB, disabling\n");
+
return 0;
}
+void ionic_dev_teardown(struct ionic *ionic)
+{
+ struct ionic_dev *idev = &ionic->idev;
+
+ kfree(idev->cmb_inuse);
+ idev->cmb_inuse = NULL;
+ idev->phy_cmb_pages = 0;
+ idev->cmb_npages = 0;
+
+ mutex_destroy(&idev->cmb_inuse_lock);
+}
+
/* Devcmd Interface */
bool ionic_is_fw_running(struct ionic_dev *idev)
{
@@ -571,6 +599,33 @@ int ionic_db_page_num(struct ionic_lif *lif, int pid)
return (lif->hw_index * lif->dbid_count) + pid;
}
+int ionic_get_cmb(struct ionic_lif *lif, u32 *pgid, phys_addr_t *pgaddr, int order)
+{
+ struct ionic_dev *idev = &lif->ionic->idev;
+ int ret;
+
+ mutex_lock(&idev->cmb_inuse_lock);
+ ret = bitmap_find_free_region(idev->cmb_inuse, idev->cmb_npages, order);
+ mutex_unlock(&idev->cmb_inuse_lock);
+
+ if (ret < 0)
+ return ret;
+
+ *pgid = ret;
+ *pgaddr = idev->phy_cmb_pages + ret * PAGE_SIZE;
+
+ return 0;
+}
+
+void ionic_put_cmb(struct ionic_lif *lif, u32 pgid, int order)
+{
+ struct ionic_dev *idev = &lif->ionic->idev;
+
+ mutex_lock(&idev->cmb_inuse_lock);
+ bitmap_release_region(idev->cmb_inuse, pgid, order);
+ mutex_unlock(&idev->cmb_inuse_lock);
+}
+
int ionic_cq_init(struct ionic_lif *lif, struct ionic_cq *cq,
struct ionic_intr_info *intr,
unsigned int num_descs, size_t desc_size)
@@ -679,6 +734,18 @@ void ionic_q_map(struct ionic_queue *q, void *base, dma_addr_t base_pa)
cur->desc = base + (i * q->desc_size);
}
+void ionic_q_cmb_map(struct ionic_queue *q, void __iomem *base, dma_addr_t base_pa)
+{
+ struct ionic_desc_info *cur;
+ unsigned int i;
+
+ q->cmb_base = base;
+ q->cmb_base_pa = base_pa;
+
+ for (i = 0, cur = q->info; i < q->num_descs; i++, cur++)
+ cur->cmb_desc = base + (i * q->desc_size);
+}
+
void ionic_q_sg_map(struct ionic_queue *q, void *base, dma_addr_t base_pa)
{
struct ionic_desc_info *cur;
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_dev.h b/drivers/net/ethernet/pensando/ionic/ionic_dev.h
index 2a1d7b9c07e7..a4a8802f3771 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_dev.h
+++ b/drivers/net/ethernet/pensando/ionic/ionic_dev.h
@@ -153,6 +153,11 @@ struct ionic_dev {
struct ionic_intr __iomem *intr_ctrl;
u64 __iomem *intr_status;
+ struct mutex cmb_inuse_lock; /* for cmb_inuse */
+ unsigned long *cmb_inuse;
+ dma_addr_t phy_cmb_pages;
+ u32 cmb_npages;
+
u32 port_info_sz;
struct ionic_port_info *port_info;
dma_addr_t port_info_pa;
@@ -197,6 +202,7 @@ struct ionic_desc_info {
struct ionic_rxq_desc *rxq_desc;
struct ionic_admin_cmd *adminq_desc;
};
+ void __iomem *cmb_desc;
union {
void *sg_desc;
struct ionic_txq_sg_desc *txq_sg_desc;
@@ -233,12 +239,14 @@ struct ionic_queue {
struct ionic_rxq_desc *rxq;
struct ionic_admin_cmd *adminq;
};
+ void __iomem *cmb_base;
union {
void *sg_base;
struct ionic_txq_sg_desc *txq_sgl;
struct ionic_rxq_sg_desc *rxq_sgl;
};
dma_addr_t base_pa;
+ dma_addr_t cmb_base_pa;
dma_addr_t sg_base_pa;
unsigned int desc_size;
unsigned int sg_desc_size;
@@ -301,6 +309,7 @@ static inline bool ionic_q_has_space(struct ionic_queue *q, unsigned int want)
void ionic_init_devinfo(struct ionic *ionic);
int ionic_dev_setup(struct ionic *ionic);
+void ionic_dev_teardown(struct ionic *ionic);
void ionic_dev_cmd_go(struct ionic_dev *idev, union ionic_dev_cmd *cmd);
u8 ionic_dev_cmd_status(struct ionic_dev *idev);
@@ -336,6 +345,9 @@ void ionic_dev_cmd_adminq_init(struct ionic_dev *idev, struct ionic_qcq *qcq,
int ionic_db_page_num(struct ionic_lif *lif, int pid);
+int ionic_get_cmb(struct ionic_lif *lif, u32 *pgid, phys_addr_t *pgaddr, int order);
+void ionic_put_cmb(struct ionic_lif *lif, u32 pgid, int order);
+
int ionic_cq_init(struct ionic_lif *lif, struct ionic_cq *cq,
struct ionic_intr_info *intr,
unsigned int num_descs, size_t desc_size);
@@ -352,6 +364,7 @@ int ionic_q_init(struct ionic_lif *lif, struct ionic_dev *idev,
unsigned int num_descs, size_t desc_size,
size_t sg_desc_size, unsigned int pid);
void ionic_q_map(struct ionic_queue *q, void *base, dma_addr_t base_pa);
+void ionic_q_cmb_map(struct ionic_queue *q, void __iomem *base, dma_addr_t base_pa);
void ionic_q_sg_map(struct ionic_queue *q, void *base, dma_addr_t base_pa);
void ionic_q_post(struct ionic_queue *q, bool ring_doorbell, ionic_desc_cb cb,
void *cb_arg);
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_ethtool.c b/drivers/net/ethernet/pensando/ionic/ionic_ethtool.c
index 01c22701482d..cf33503468a3 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_ethtool.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_ethtool.c
@@ -511,6 +511,87 @@ static int ionic_set_coalesce(struct net_device *netdev,
return 0;
}
+static int ionic_validate_cmb_config(struct ionic_lif *lif,
+ struct ionic_queue_params *qparam)
+{
+ int pages_have, pages_required = 0;
+ unsigned long sz;
+
+ if (!lif->ionic->idev.cmb_inuse &&
+ (qparam->cmb_tx || qparam->cmb_rx)) {
+ netdev_info(lif->netdev, "CMB rings are not supported on this device\n");
+ return -EOPNOTSUPP;
+ }
+
+ if (qparam->cmb_tx) {
+ if (!(lif->qtype_info[IONIC_QTYPE_TXQ].features & IONIC_QIDENT_F_CMB)) {
+ netdev_info(lif->netdev,
+ "CMB rings for tx-push are not supported on this device\n");
+ return -EOPNOTSUPP;
+ }
+
+ sz = sizeof(struct ionic_txq_desc) * qparam->ntxq_descs * qparam->nxqs;
+ pages_required += ALIGN(sz, PAGE_SIZE) / PAGE_SIZE;
+ }
+
+ if (qparam->cmb_rx) {
+ if (!(lif->qtype_info[IONIC_QTYPE_RXQ].features & IONIC_QIDENT_F_CMB)) {
+ netdev_info(lif->netdev,
+ "CMB rings for rx-push are not supported on this device\n");
+ return -EOPNOTSUPP;
+ }
+
+ sz = sizeof(struct ionic_rxq_desc) * qparam->nrxq_descs * qparam->nxqs;
+ pages_required += ALIGN(sz, PAGE_SIZE) / PAGE_SIZE;
+ }
+
+ pages_have = lif->ionic->bars[IONIC_PCI_BAR_CMB].len / PAGE_SIZE;
+ if (pages_required > pages_have) {
+ netdev_info(lif->netdev,
+ "Not enough CMB pages for number of queues and size of descriptor rings, need %d have %d",
+ pages_required, pages_have);
+ return -ENOMEM;
+ }
+
+ return pages_required;
+}
+
+static int ionic_cmb_rings_toggle(struct ionic_lif *lif, bool cmb_tx, bool cmb_rx)
+{
+ struct ionic_queue_params qparam;
+ int pages_used;
+
+ if (netif_running(lif->netdev)) {
+ netdev_info(lif->netdev, "Please stop device to toggle CMB for tx/rx-push\n");
+ return -EBUSY;
+ }
+
+ ionic_init_queue_params(lif, &qparam);
+ qparam.cmb_tx = cmb_tx;
+ qparam.cmb_rx = cmb_rx;
+ pages_used = ionic_validate_cmb_config(lif, &qparam);
+ if (pages_used < 0)
+ return pages_used;
+
+ if (cmb_tx)
+ set_bit(IONIC_LIF_F_CMB_TX_RINGS, lif->state);
+ else
+ clear_bit(IONIC_LIF_F_CMB_TX_RINGS, lif->state);
+
+ if (cmb_rx)
+ set_bit(IONIC_LIF_F_CMB_RX_RINGS, lif->state);
+ else
+ clear_bit(IONIC_LIF_F_CMB_RX_RINGS, lif->state);
+
+ if (cmb_tx || cmb_rx)
+ netdev_info(lif->netdev, "Enabling CMB %s %s rings - %d pages\n",
+ cmb_tx ? "TX" : "", cmb_rx ? "RX" : "", pages_used);
+ else
+ netdev_info(lif->netdev, "Disabling CMB rings\n");
+
+ return 0;
+}
+
static void ionic_get_ringparam(struct net_device *netdev,
struct ethtool_ringparam *ring,
struct kernel_ethtool_ringparam *kernel_ring,
@@ -522,6 +603,8 @@ static void ionic_get_ringparam(struct net_device *netdev,
ring->tx_pending = lif->ntxq_descs;
ring->rx_max_pending = IONIC_MAX_RX_DESC;
ring->rx_pending = lif->nrxq_descs;
+ kernel_ring->tx_push = test_bit(IONIC_LIF_F_CMB_TX_RINGS, lif->state);
+ kernel_ring->rx_push = test_bit(IONIC_LIF_F_CMB_RX_RINGS, lif->state);
}
static int ionic_set_ringparam(struct net_device *netdev,
@@ -551,9 +634,28 @@ static int ionic_set_ringparam(struct net_device *netdev,
/* if nothing to do return success */
if (ring->tx_pending == lif->ntxq_descs &&
- ring->rx_pending == lif->nrxq_descs)
+ ring->rx_pending == lif->nrxq_descs &&
+ kernel_ring->tx_push == test_bit(IONIC_LIF_F_CMB_TX_RINGS, lif->state) &&
+ kernel_ring->rx_push == test_bit(IONIC_LIF_F_CMB_RX_RINGS, lif->state))
return 0;
+ qparam.ntxq_descs = ring->tx_pending;
+ qparam.nrxq_descs = ring->rx_pending;
+ qparam.cmb_tx = kernel_ring->tx_push;
+ qparam.cmb_rx = kernel_ring->rx_push;
+
+ err = ionic_validate_cmb_config(lif, &qparam);
+ if (err < 0)
+ return err;
+
+ if (kernel_ring->tx_push != test_bit(IONIC_LIF_F_CMB_TX_RINGS, lif->state) ||
+ kernel_ring->rx_push != test_bit(IONIC_LIF_F_CMB_RX_RINGS, lif->state)) {
+ err = ionic_cmb_rings_toggle(lif, kernel_ring->tx_push,
+ kernel_ring->rx_push);
+ if (err < 0)
+ return err;
+ }
+
if (ring->tx_pending != lif->ntxq_descs)
netdev_info(netdev, "Changing Tx ring size from %d to %d\n",
lif->ntxq_descs, ring->tx_pending);
@@ -569,9 +671,6 @@ static int ionic_set_ringparam(struct net_device *netdev,
return 0;
}
- qparam.ntxq_descs = ring->tx_pending;
- qparam.nrxq_descs = ring->rx_pending;
-
mutex_lock(&lif->queue_lock);
err = ionic_reconfigure_queues(lif, &qparam);
mutex_unlock(&lif->queue_lock);
@@ -638,7 +737,7 @@ static int ionic_set_channels(struct net_device *netdev,
lif->nxqs, ch->combined_count);
qparam.nxqs = ch->combined_count;
- qparam.intr_split = 0;
+ qparam.intr_split = false;
} else {
max_cnt /= 2;
if (ch->rx_count > max_cnt)
@@ -654,9 +753,13 @@ static int ionic_set_channels(struct net_device *netdev,
lif->nxqs, ch->rx_count);
qparam.nxqs = ch->rx_count;
- qparam.intr_split = 1;
+ qparam.intr_split = true;
}
+ err = ionic_validate_cmb_config(lif, &qparam);
+ if (err < 0)
+ return err;
+
/* if we're not running, just set the values and return */
if (!netif_running(lif->netdev)) {
lif->nxqs = qparam.nxqs;
@@ -965,6 +1068,8 @@ static const struct ethtool_ops ionic_ethtool_ops = {
.supported_coalesce_params = ETHTOOL_COALESCE_USECS |
ETHTOOL_COALESCE_USE_ADAPTIVE_RX |
ETHTOOL_COALESCE_USE_ADAPTIVE_TX,
+ .supported_ring_params = ETHTOOL_RING_USE_TX_PUSH |
+ ETHTOOL_RING_USE_RX_PUSH,
.get_drvinfo = ionic_get_drvinfo,
.get_regs_len = ionic_get_regs_len,
.get_regs = ionic_get_regs,
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_if.h b/drivers/net/ethernet/pensando/ionic/ionic_if.h
index eac09b2375b8..9a1825edf0d0 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_if.h
+++ b/drivers/net/ethernet/pensando/ionic/ionic_if.h
@@ -3073,9 +3073,10 @@ union ionic_adminq_comp {
#define IONIC_BARS_MAX 6
#define IONIC_PCI_BAR_DBELL 1
+#define IONIC_PCI_BAR_CMB 2
-/* BAR0 */
#define IONIC_BAR0_SIZE 0x8000
+#define IONIC_BAR2_SIZE 0x800000
#define IONIC_BAR0_DEV_INFO_REGS_OFFSET 0x0000
#define IONIC_BAR0_DEV_CMD_REGS_OFFSET 0x0800
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.c b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
index 8499165b1563..5593bcd4dc57 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
@@ -25,9 +25,12 @@
static const u8 ionic_qtype_versions[IONIC_QTYPE_MAX] = {
[IONIC_QTYPE_ADMINQ] = 0, /* 0 = Base version with CQ support */
[IONIC_QTYPE_NOTIFYQ] = 0, /* 0 = Base version */
- [IONIC_QTYPE_RXQ] = 0, /* 0 = Base version with CQ+SG support */
- [IONIC_QTYPE_TXQ] = 1, /* 0 = Base version with CQ+SG support
- * 1 = ... with Tx SG version 1
+ [IONIC_QTYPE_RXQ] = 2, /* 0 = Base version with CQ+SG support
+ * 2 = ... with CMB rings
+ */
+ [IONIC_QTYPE_TXQ] = 3, /* 0 = Base version with CQ+SG support
+ * 1 = ... with Tx SG version 1
+ * 3 = ... with CMB rings
*/
};
@@ -379,6 +382,15 @@ static void ionic_qcq_free(struct ionic_lif *lif, struct ionic_qcq *qcq)
qcq->q_base_pa = 0;
}
+ if (qcq->cmb_q_base) {
+ iounmap(qcq->cmb_q_base);
+ ionic_put_cmb(lif, qcq->cmb_pgid, qcq->cmb_order);
+ qcq->cmb_pgid = 0;
+ qcq->cmb_order = 0;
+ qcq->cmb_q_base = NULL;
+ qcq->cmb_q_base_pa = 0;
+ }
+
if (qcq->cq_base) {
dma_free_coherent(dev, qcq->cq_size, qcq->cq_base, qcq->cq_base_pa);
qcq->cq_base = NULL;
@@ -587,6 +599,7 @@ static int ionic_qcq_alloc(struct ionic_lif *lif, unsigned int type,
ionic_cq_map(&new->cq, cq_base, cq_base_pa);
ionic_cq_bind(&new->cq, &new->q);
} else {
+ /* regular DMA q descriptors */
new->q_size = PAGE_SIZE + (num_descs * desc_size);
new->q_base = dma_alloc_coherent(dev, new->q_size, &new->q_base_pa,
GFP_KERNEL);
@@ -599,6 +612,33 @@ static int ionic_qcq_alloc(struct ionic_lif *lif, unsigned int type,
q_base_pa = ALIGN(new->q_base_pa, PAGE_SIZE);
ionic_q_map(&new->q, q_base, q_base_pa);
+ if (flags & IONIC_QCQ_F_CMB_RINGS) {
+ /* on-chip CMB q descriptors */
+ new->cmb_q_size = num_descs * desc_size;
+ new->cmb_order = order_base_2(new->cmb_q_size / PAGE_SIZE);
+
+ err = ionic_get_cmb(lif, &new->cmb_pgid, &new->cmb_q_base_pa,
+ new->cmb_order);
+ if (err) {
+ netdev_err(lif->netdev,
+ "Cannot allocate queue order %d from cmb: err %d\n",
+ new->cmb_order, err);
+ goto err_out_free_q;
+ }
+
+ new->cmb_q_base = ioremap_wc(new->cmb_q_base_pa, new->cmb_q_size);
+ if (!new->cmb_q_base) {
+ netdev_err(lif->netdev, "Cannot map queue from cmb\n");
+ ionic_put_cmb(lif, new->cmb_pgid, new->cmb_order);
+ err = -ENOMEM;
+ goto err_out_free_q;
+ }
+
+ new->cmb_q_base_pa -= idev->phy_cmb_pages;
+ ionic_q_cmb_map(&new->q, new->cmb_q_base, new->cmb_q_base_pa);
+ }
+
+ /* cq DMA descriptors */
new->cq_size = PAGE_SIZE + (num_descs * cq_desc_size);
new->cq_base = dma_alloc_coherent(dev, new->cq_size, &new->cq_base_pa,
GFP_KERNEL);
@@ -637,6 +677,10 @@ static int ionic_qcq_alloc(struct ionic_lif *lif, unsigned int type,
err_out_free_cq:
dma_free_coherent(dev, new->cq_size, new->cq_base, new->cq_base_pa);
err_out_free_q:
+ if (new->cmb_q_base) {
+ iounmap(new->cmb_q_base);
+ ionic_put_cmb(lif, new->cmb_pgid, new->cmb_order);
+ }
dma_free_coherent(dev, new->q_size, new->q_base, new->q_base_pa);
err_out_free_cq_info:
vfree(new->cq.info);
@@ -718,6 +762,8 @@ static void ionic_qcq_sanitize(struct ionic_qcq *qcq)
qcq->cq.tail_idx = 0;
qcq->cq.done_color = 1;
memset(qcq->q_base, 0, qcq->q_size);
+ if (qcq->cmb_q_base)
+ memset_io(qcq->cmb_q_base, 0, qcq->cmb_q_size);
memset(qcq->cq_base, 0, qcq->cq_size);
memset(qcq->sg_base, 0, qcq->sg_size);
}
@@ -737,6 +783,7 @@ static int ionic_lif_txq_init(struct ionic_lif *lif, struct ionic_qcq *qcq)
.index = cpu_to_le32(q->index),
.flags = cpu_to_le16(IONIC_QINIT_F_IRQ |
IONIC_QINIT_F_SG),
+ .intr_index = cpu_to_le16(qcq->intr.index),
.pid = cpu_to_le16(q->pid),
.ring_size = ilog2(q->num_descs),
.ring_base = cpu_to_le64(q->base_pa),
@@ -745,17 +792,19 @@ static int ionic_lif_txq_init(struct ionic_lif *lif, struct ionic_qcq *qcq)
.features = cpu_to_le64(q->features),
},
};
- unsigned int intr_index;
int err;
- intr_index = qcq->intr.index;
-
- ctx.cmd.q_init.intr_index = cpu_to_le16(intr_index);
+ if (qcq->flags & IONIC_QCQ_F_CMB_RINGS) {
+ ctx.cmd.q_init.flags |= cpu_to_le16(IONIC_QINIT_F_CMB);
+ ctx.cmd.q_init.ring_base = cpu_to_le64(qcq->cmb_q_base_pa);
+ }
dev_dbg(dev, "txq_init.pid %d\n", ctx.cmd.q_init.pid);
dev_dbg(dev, "txq_init.index %d\n", ctx.cmd.q_init.index);
dev_dbg(dev, "txq_init.ring_base 0x%llx\n", ctx.cmd.q_init.ring_base);
dev_dbg(dev, "txq_init.ring_size %d\n", ctx.cmd.q_init.ring_size);
+ dev_dbg(dev, "txq_init.cq_ring_base 0x%llx\n", ctx.cmd.q_init.cq_ring_base);
+ dev_dbg(dev, "txq_init.sg_ring_base 0x%llx\n", ctx.cmd.q_init.sg_ring_base);
dev_dbg(dev, "txq_init.flags 0x%x\n", ctx.cmd.q_init.flags);
dev_dbg(dev, "txq_init.ver %d\n", ctx.cmd.q_init.ver);
dev_dbg(dev, "txq_init.intr_index %d\n", ctx.cmd.q_init.intr_index);
@@ -807,6 +856,11 @@ static int ionic_lif_rxq_init(struct ionic_lif *lif, struct ionic_qcq *qcq)
};
int err;
+ if (qcq->flags & IONIC_QCQ_F_CMB_RINGS) {
+ ctx.cmd.q_init.flags |= cpu_to_le16(IONIC_QINIT_F_CMB);
+ ctx.cmd.q_init.ring_base = cpu_to_le64(qcq->cmb_q_base_pa);
+ }
+
dev_dbg(dev, "rxq_init.pid %d\n", ctx.cmd.q_init.pid);
dev_dbg(dev, "rxq_init.index %d\n", ctx.cmd.q_init.index);
dev_dbg(dev, "rxq_init.ring_base 0x%llx\n", ctx.cmd.q_init.ring_base);
@@ -1966,8 +2020,13 @@ static int ionic_txrx_alloc(struct ionic_lif *lif)
sg_desc_sz = sizeof(struct ionic_txq_sg_desc);
flags = IONIC_QCQ_F_TX_STATS | IONIC_QCQ_F_SG;
+
+ if (test_bit(IONIC_LIF_F_CMB_TX_RINGS, lif->state))
+ flags |= IONIC_QCQ_F_CMB_RINGS;
+
if (test_bit(IONIC_LIF_F_SPLIT_INTR, lif->state))
flags |= IONIC_QCQ_F_INTR;
+
for (i = 0; i < lif->nxqs; i++) {
err = ionic_qcq_alloc(lif, IONIC_QTYPE_TXQ, i, "tx", flags,
num_desc, desc_sz, comp_sz, sg_desc_sz,
@@ -1988,6 +2047,9 @@ static int ionic_txrx_alloc(struct ionic_lif *lif)
flags = IONIC_QCQ_F_RX_STATS | IONIC_QCQ_F_SG | IONIC_QCQ_F_INTR;
+ if (test_bit(IONIC_LIF_F_CMB_RX_RINGS, lif->state))
+ flags |= IONIC_QCQ_F_CMB_RINGS;
+
num_desc = lif->nrxq_descs;
desc_sz = sizeof(struct ionic_rxq_desc);
comp_sz = sizeof(struct ionic_rxq_comp);
@@ -2663,6 +2725,55 @@ static const struct net_device_ops ionic_netdev_ops = {
.ndo_get_vf_stats = ionic_get_vf_stats,
};
+static int ionic_cmb_reconfig(struct ionic_lif *lif,
+ struct ionic_queue_params *qparam)
+{
+ struct ionic_queue_params start_qparams;
+ int err = 0;
+
+ /* When changing CMB queue parameters, we're using limited
+ * on-device memory and don't have extra memory to use for
+ * duplicate allocations, so we free it all first then
+ * re-allocate with the new parameters.
+ */
+
+ /* Checkpoint for possible unwind */
+ ionic_init_queue_params(lif, &start_qparams);
+
+ /* Stop and free the queues */
+ ionic_stop_queues_reconfig(lif);
+ ionic_txrx_free(lif);
+
+ /* Set up new qparams */
+ ionic_set_queue_params(lif, qparam);
+
+ if (netif_running(lif->netdev)) {
+ /* Alloc and start the new configuration */
+ err = ionic_txrx_alloc(lif);
+ if (err) {
+ dev_warn(lif->ionic->dev,
+ "CMB reconfig failed, restoring values: %d\n", err);
+
+ /* Back out the changes */
+ ionic_set_queue_params(lif, &start_qparams);
+ err = ionic_txrx_alloc(lif);
+ if (err) {
+ dev_err(lif->ionic->dev,
+ "CMB restore failed: %d\n", err);
+ goto errout;
+ }
+ }
+
+ ionic_start_queues_reconfig(lif);
+ } else {
+ /* This was detached in ionic_stop_queues_reconfig() */
+ netif_device_attach(lif->netdev);
+ }
+
+errout:
+ return err;
+}
+
static void ionic_swap_queues(struct ionic_qcq *a, struct ionic_qcq *b)
{
/* only swapping the queues, not the napi, flags, or other stuff */
@@ -2705,6 +2816,11 @@ int ionic_reconfigure_queues(struct ionic_lif *lif,
unsigned int flags, i;
int err = 0;
+ /* Are we changing q params while CMB is on */
+ if ((test_bit(IONIC_LIF_F_CMB_TX_RINGS, lif->state) && qparam->cmb_tx) ||
+ (test_bit(IONIC_LIF_F_CMB_RX_RINGS, lif->state) && qparam->cmb_rx))
+ return ionic_cmb_reconfig(lif, qparam);
+
/* allocate temporary qcq arrays to hold new queue structs */
if (qparam->nxqs != lif->nxqs || qparam->ntxq_descs != lif->ntxq_descs) {
tx_qcqs = devm_kcalloc(lif->ionic->dev, lif->ionic->ntxqs_per_lif,
@@ -2741,6 +2857,16 @@ int ionic_reconfigure_queues(struct ionic_lif *lif,
sg_desc_sz = sizeof(struct ionic_txq_sg_desc);
for (i = 0; i < qparam->nxqs; i++) {
+ /* If missing, short placeholder qcq needed for swap */
+ if (!lif->txqcqs[i]) {
+ flags = IONIC_QCQ_F_TX_STATS | IONIC_QCQ_F_SG;
+ err = ionic_qcq_alloc(lif, IONIC_QTYPE_TXQ, i, "tx", flags,
+ 4, desc_sz, comp_sz, sg_desc_sz,
+ lif->kern_pid, &lif->txqcqs[i]);
+ if (err)
+ goto err_out;
+ }
+
flags = lif->txqcqs[i]->flags & ~IONIC_QCQ_F_INTR;
err = ionic_qcq_alloc(lif, IONIC_QTYPE_TXQ, i, "tx", flags,
num_desc, desc_sz, comp_sz, sg_desc_sz,
@@ -2760,6 +2886,16 @@ int ionic_reconfigure_queues(struct ionic_lif *lif,
comp_sz *= 2;
for (i = 0; i < qparam->nxqs; i++) {
+ /* If missing, short placeholder qcq needed for swap */
+ if (!lif->rxqcqs[i]) {
+ flags = IONIC_QCQ_F_RX_STATS | IONIC_QCQ_F_SG;
+ err = ionic_qcq_alloc(lif, IONIC_QTYPE_RXQ, i, "rx", flags,
+ 4, desc_sz, comp_sz, sg_desc_sz,
+ lif->kern_pid, &lif->rxqcqs[i]);
+ if (err)
+ goto err_out;
+ }
+
flags = lif->rxqcqs[i]->flags & ~IONIC_QCQ_F_INTR;
err = ionic_qcq_alloc(lif, IONIC_QTYPE_RXQ, i, "rx", flags,
num_desc, desc_sz, comp_sz, sg_desc_sz,
@@ -2809,10 +2945,15 @@ int ionic_reconfigure_queues(struct ionic_lif *lif,
lif->tx_coalesce_hw = lif->rx_coalesce_hw;
}
- /* clear existing interrupt assignments */
+ /* Clear existing interrupt assignments. We check for NULL here
+ * because we're checking the whole array for potential qcqs, not
+ * just those qcqs that have just been set up.
+ */
for (i = 0; i < lif->ionic->ntxqs_per_lif; i++) {
- ionic_qcq_intr_free(lif, lif->txqcqs[i]);
- ionic_qcq_intr_free(lif, lif->rxqcqs[i]);
+ if (lif->txqcqs[i])
+ ionic_qcq_intr_free(lif, lif->txqcqs[i]);
+ if (lif->rxqcqs[i])
+ ionic_qcq_intr_free(lif, lif->rxqcqs[i]);
}
/* re-assign the interrupts */
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.h b/drivers/net/ethernet/pensando/ionic/ionic_lif.h
index a53984bf3544..741d41445559 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.h
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.h
@@ -59,6 +59,7 @@ struct ionic_rx_stats {
#define IONIC_QCQ_F_TX_STATS BIT(3)
#define IONIC_QCQ_F_RX_STATS BIT(4)
#define IONIC_QCQ_F_NOTIFYQ BIT(5)
+#define IONIC_QCQ_F_CMB_RINGS BIT(6)
struct ionic_qcq {
void *q_base;
@@ -70,6 +71,11 @@ struct ionic_qcq {
void *sg_base;
dma_addr_t sg_base_pa;
u32 sg_size;
+ void __iomem *cmb_q_base;
+ phys_addr_t cmb_q_base_pa;
+ u32 cmb_q_size;
+ u32 cmb_pgid;
+ u32 cmb_order;
struct dim dim;
struct ionic_queue q;
struct ionic_cq cq;
@@ -140,6 +146,8 @@ enum ionic_lif_state_flags {
IONIC_LIF_F_BROKEN,
IONIC_LIF_F_TX_DIM_INTR,
IONIC_LIF_F_RX_DIM_INTR,
+ IONIC_LIF_F_CMB_TX_RINGS,
+ IONIC_LIF_F_CMB_RX_RINGS,
/* leave this as last */
IONIC_LIF_F_STATE_SIZE
@@ -243,8 +251,10 @@ struct ionic_queue_params {
unsigned int nxqs;
unsigned int ntxq_descs;
unsigned int nrxq_descs;
- unsigned int intr_split;
u64 rxq_features;
+ bool intr_split;
+ bool cmb_tx;
+ bool cmb_rx;
};
static inline void ionic_init_queue_params(struct ionic_lif *lif,
@@ -253,8 +263,34 @@ static inline void ionic_init_queue_params(struct ionic_lif *lif,
qparam->nxqs = lif->nxqs;
qparam->ntxq_descs = lif->ntxq_descs;
qparam->nrxq_descs = lif->nrxq_descs;
- qparam->intr_split = test_bit(IONIC_LIF_F_SPLIT_INTR, lif->state);
qparam->rxq_features = lif->rxq_features;
+ qparam->intr_split = test_bit(IONIC_LIF_F_SPLIT_INTR, lif->state);
+ qparam->cmb_tx = test_bit(IONIC_LIF_F_CMB_TX_RINGS, lif->state);
+ qparam->cmb_rx = test_bit(IONIC_LIF_F_CMB_RX_RINGS, lif->state);
+}
+
+static inline void ionic_set_queue_params(struct ionic_lif *lif,
+ struct ionic_queue_params *qparam)
+{
+ lif->nxqs = qparam->nxqs;
+ lif->ntxq_descs = qparam->ntxq_descs;
+ lif->nrxq_descs = qparam->nrxq_descs;
+ lif->rxq_features = qparam->rxq_features;
+
+ if (qparam->intr_split)
+ set_bit(IONIC_LIF_F_SPLIT_INTR, lif->state);
+ else
+ clear_bit(IONIC_LIF_F_SPLIT_INTR, lif->state);
+
+ if (qparam->cmb_tx)
+ set_bit(IONIC_LIF_F_CMB_TX_RINGS, lif->state);
+ else
+ clear_bit(IONIC_LIF_F_CMB_TX_RINGS, lif->state);
+
+ if (qparam->cmb_rx)
+ set_bit(IONIC_LIF_F_CMB_RX_RINGS, lif->state);
+ else
+ clear_bit(IONIC_LIF_F_CMB_RX_RINGS, lif->state);
}
static inline u32 ionic_coal_usec_to_hw(struct ionic *ionic, u32 usecs)
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_txrx.c b/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
index 0c3977416cd1..413ff735225b 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
@@ -341,6 +341,14 @@ bool ionic_rx_service(struct ionic_cq *cq, struct ionic_cq_info *cq_info)
return true;
}
+static inline void ionic_write_cmb_desc(struct ionic_queue *q,
+ void __iomem *cmb_desc,
+ void *desc)
+{
+ if (q_to_qcq(q)->flags & IONIC_QCQ_F_CMB_RINGS)
+ memcpy_toio(cmb_desc, desc, q->desc_size);
+}
+
void ionic_rx_fill(struct ionic_queue *q)
{
struct net_device *netdev = q->lif->netdev;
@@ -419,6 +427,8 @@ void ionic_rx_fill(struct ionic_queue *q)
IONIC_RXQ_DESC_OPCODE_SIMPLE;
desc_info->nbufs = nfrags;
+ ionic_write_cmb_desc(q, desc_info->cmb_desc, desc);
+
ionic_rxq_post(q, false, ionic_rx_clean, NULL);
}
@@ -860,7 +870,8 @@ static int ionic_tx_tcp_pseudo_csum(struct sk_buff *skb)
return 0;
}
-static void ionic_tx_tso_post(struct ionic_queue *q, struct ionic_txq_desc *desc,
+static void ionic_tx_tso_post(struct ionic_queue *q,
+ struct ionic_desc_info *desc_info,
struct sk_buff *skb,
dma_addr_t addr, u8 nsge, u16 len,
unsigned int hdrlen, unsigned int mss,
@@ -868,6 +879,7 @@ static void ionic_tx_tso_post(struct ionic_queue *q, struct ionic_txq_desc *desc
u16 vlan_tci, bool has_vlan,
bool start, bool done)
{
+ struct ionic_txq_desc *desc = desc_info->desc;
u8 flags = 0;
u64 cmd;
@@ -883,6 +895,8 @@ static void ionic_tx_tso_post(struct ionic_queue *q, struct ionic_txq_desc *desc
desc->hdr_len = cpu_to_le16(hdrlen);
desc->mss = cpu_to_le16(mss);
+ ionic_write_cmb_desc(q, desc_info->cmb_desc, desc);
+
if (start) {
skb_tx_timestamp(skb);
if (!unlikely(q->features & IONIC_TXQ_F_HWSTAMP))
@@ -1001,7 +1015,7 @@ static int ionic_tx_tso(struct ionic_queue *q, struct sk_buff *skb)
seg_rem = min(tso_rem, mss);
done = (tso_rem == 0);
/* post descriptor */
- ionic_tx_tso_post(q, desc, skb,
+ ionic_tx_tso_post(q, desc_info, skb,
desc_addr, desc_nsge, desc_len,
hdrlen, mss, outer_csum, vlan_tci, has_vlan,
start, done);
@@ -1050,6 +1064,8 @@ static void ionic_tx_calc_csum(struct ionic_queue *q, struct sk_buff *skb,
desc->csum_start = cpu_to_le16(skb_checksum_start_offset(skb));
desc->csum_offset = cpu_to_le16(skb->csum_offset);
+ ionic_write_cmb_desc(q, desc_info->cmb_desc, desc);
+
if (skb_csum_is_sctp(skb))
stats->crc32_csum++;
else
@@ -1087,6 +1103,8 @@ static void ionic_tx_calc_no_csum(struct ionic_queue *q, struct sk_buff *skb,
desc->csum_start = 0;
desc->csum_offset = 0;
+ ionic_write_cmb_desc(q, desc_info->cmb_desc, desc);
+
stats->csum_none++;
}
--
2.17.1
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