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NTB bug and documentation fixes, new device IDs, performance

Browse source 
improvements, and adding a mailing list to MAINTAINERS for NTB.
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Merge tag 'ntb-4.3' of git://github.com/jonmason/ntb

Pull NTB fixes from Jon Mason:
 "NTB bug and documentation fixes, new device IDs, performance
  improvements, and adding a mailing list to MAINTAINERS for NTB"

* tag 'ntb-4.3' of git://github.com/jonmason/ntb:
  NTB: Fix range check on memory window index
  NTB: Improve index handling in B2B MW workaround
  NTB: Fix documentation for ntb_peer_db_clear.
  NTB: Fix documentation for ntb_link_is_up
  NTB: Use unique DMA channels for TX and RX
  NTB: Remove dma_sync_wait from ntb_async_rx
  NTB: Clean up QP stats info
  NTB: Make the transport list in order of discovery
  NTB: Add PCI Device IDs for Broadwell Xeon
  NTB: Add flow control to the ntb_netdev
  NTB: Add list to MAINTAINERS
This commit is contained in:
Linus Torvalds 2015-09-11 19:29:00 -07:00
commit ded0e250b5
7 changed files with 210 additions and 47 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
MAINTAINERS
View file

@ -7396,6 +7396,7 @@ NTB DRIVER CORE
M: Jon Mason <jdmason@kudzu.us>
M: Dave Jiang <dave.jiang@intel.com>
M: Allen Hubbe <Allen.Hubbe@emc.com>
L: linux-ntb@googlegroups.com
S: Supported
W: https://github.com/jonmason/ntb/wiki
T: git git://github.com/jonmason/ntb.git
@ -7407,6 +7408,7 @@ F: include/linux/ntb_transport.h
NTB INTEL DRIVER
M: Jon Mason <jdmason@kudzu.us>
M: Dave Jiang <dave.jiang@intel.com>
L: linux-ntb@googlegroups.com
S: Supported
W: https://github.com/jonmason/ntb/wiki
T: git git://github.com/jonmason/ntb.git

77
drivers/net/ntb_netdev.c
View file

@ -61,11 +61,21 @@ MODULE_VERSION(NTB_NETDEV_VER);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("Intel Corporation");
/* Time in usecs for tx resource reaper */
static unsigned int tx_time = 1;
/* Number of descriptors to free before resuming tx */
static unsigned int tx_start = 10;
/* Number of descriptors still available before stop upper layer tx */
static unsigned int tx_stop = 5;
struct ntb_netdev {
struct list_head list;
struct pci_dev *pdev;
struct net_device *ndev;
struct ntb_transport_qp *qp;
struct timer_list tx_timer;
};
#define NTB_TX_TIMEOUT_MS 1000
@ -136,11 +146,42 @@ static void ntb_netdev_rx_handler(struct ntb_transport_qp *qp, void *qp_data,
}
}
static int __ntb_netdev_maybe_stop_tx(struct net_device *netdev,
struct ntb_transport_qp *qp, int size)
{
struct ntb_netdev *dev = netdev_priv(netdev);
netif_stop_queue(netdev);
/* Make sure to see the latest value of ntb_transport_tx_free_entry()
* since the queue was last started.
*/
smp_mb();
if (likely(ntb_transport_tx_free_entry(qp) < size)) {
mod_timer(&dev->tx_timer, jiffies + usecs_to_jiffies(tx_time));
return -EBUSY;
}
netif_start_queue(netdev);
return 0;
}
static int ntb_netdev_maybe_stop_tx(struct net_device *ndev,
struct ntb_transport_qp *qp, int size)
{
if (netif_queue_stopped(ndev) ||
(ntb_transport_tx_free_entry(qp) >= size))
return 0;
return __ntb_netdev_maybe_stop_tx(ndev, qp, size);
}
static void ntb_netdev_tx_handler(struct ntb_transport_qp *qp, void *qp_data,
void *data, int len)
{
struct net_device *ndev = qp_data;
struct sk_buff *skb;
struct ntb_netdev *dev = netdev_priv(ndev);
skb = data;
if (!skb || !ndev)
@ -155,6 +196,15 @@ static void ntb_netdev_tx_handler(struct ntb_transport_qp *qp, void *qp_data,
}
dev_kfree_skb(skb);
if (ntb_transport_tx_free_entry(dev->qp) >= tx_start) {
/* Make sure anybody stopping the queue after this sees the new
* value of ntb_transport_tx_free_entry()
*/
smp_mb();
if (netif_queue_stopped(ndev))
netif_wake_queue(ndev);
}
}
static netdev_tx_t ntb_netdev_start_xmit(struct sk_buff *skb,
@ -163,10 +213,15 @@ static netdev_tx_t ntb_netdev_start_xmit(struct sk_buff *skb,
struct ntb_netdev *dev = netdev_priv(ndev);
int rc;
ntb_netdev_maybe_stop_tx(ndev, dev->qp, tx_stop);
rc = ntb_transport_tx_enqueue(dev->qp, skb, skb->data, skb->len);
if (rc)
goto err;
/* check for next submit */
ntb_netdev_maybe_stop_tx(ndev, dev->qp, tx_stop);
return NETDEV_TX_OK;
err:
@ -175,6 +230,23 @@ static netdev_tx_t ntb_netdev_start_xmit(struct sk_buff *skb,
return NETDEV_TX_BUSY;
}
static void ntb_netdev_tx_timer(unsigned long data)
{
struct net_device *ndev = (struct net_device *)data;
struct ntb_netdev *dev = netdev_priv(ndev);
if (ntb_transport_tx_free_entry(dev->qp) < tx_stop) {
mod_timer(&dev->tx_timer, jiffies + msecs_to_jiffies(tx_time));
} else {
/* Make sure anybody stopping the queue after this sees the new
* value of ntb_transport_tx_free_entry()
*/
smp_mb();
if (netif_queue_stopped(ndev))
netif_wake_queue(ndev);
}
}
static int ntb_netdev_open(struct net_device *ndev)
{
struct ntb_netdev *dev = netdev_priv(ndev);
@ -197,8 +269,11 @@ static int ntb_netdev_open(struct net_device *ndev)
}
}
setup_timer(&dev->tx_timer, ntb_netdev_tx_timer, (unsigned long)ndev);
netif_carrier_off(ndev);
ntb_transport_link_up(dev->qp);
netif_start_queue(ndev);
return 0;
@ -219,6 +294,8 @@ static int ntb_netdev_close(struct net_device *ndev)
while ((skb = ntb_transport_rx_remove(dev->qp, &len)))
dev_kfree_skb(skb);
del_timer_sync(&dev->tx_timer);
return 0;
}

39
drivers/ntb/hw/intel/ntb_hw_intel.c
View file

@ -190,14 +190,17 @@ static inline int pdev_is_xeon(struct pci_dev *pdev)
case PCI_DEVICE_ID_INTEL_NTB_SS_SNB:
case PCI_DEVICE_ID_INTEL_NTB_SS_IVT:
case PCI_DEVICE_ID_INTEL_NTB_SS_HSX:
case PCI_DEVICE_ID_INTEL_NTB_SS_BDX:
case PCI_DEVICE_ID_INTEL_NTB_PS_JSF:
case PCI_DEVICE_ID_INTEL_NTB_PS_SNB:
case PCI_DEVICE_ID_INTEL_NTB_PS_IVT:
case PCI_DEVICE_ID_INTEL_NTB_PS_HSX:
case PCI_DEVICE_ID_INTEL_NTB_PS_BDX:
case PCI_DEVICE_ID_INTEL_NTB_B2B_JSF:
case PCI_DEVICE_ID_INTEL_NTB_B2B_SNB:
case PCI_DEVICE_ID_INTEL_NTB_B2B_IVT:
case PCI_DEVICE_ID_INTEL_NTB_B2B_HSX:
case PCI_DEVICE_ID_INTEL_NTB_B2B_BDX:
return 1;
}
return 0;
@ -237,7 +240,7 @@ static inline int ndev_ignore_unsafe(struct intel_ntb_dev *ndev,
static int ndev_mw_to_bar(struct intel_ntb_dev *ndev, int idx)
{
if (idx < 0 || idx > ndev->mw_count)
if (idx < 0 || idx >= ndev->mw_count)
return -EINVAL;
return ndev->reg->mw_bar[idx];
}
@ -572,10 +575,13 @@ static ssize_t ndev_debugfs_read(struct file *filp, char __user *ubuf,
"Connection Topology -\t%s\n",
ntb_topo_string(ndev->ntb.topo));
off += scnprintf(buf + off, buf_size - off,
"B2B Offset -\t\t%#lx\n", ndev->b2b_off);
off += scnprintf(buf + off, buf_size - off,
"B2B MW Idx -\t\t%d\n", ndev->b2b_idx);
if (ndev->b2b_idx != UINT_MAX) {
off += scnprintf(buf + off, buf_size - off,
"B2B MW Idx -\t\t%u\n", ndev->b2b_idx);
off += scnprintf(buf + off, buf_size - off,
"B2B Offset -\t\t%#lx\n", ndev->b2b_off);
}
off += scnprintf(buf + off, buf_size - off,
"BAR4 Split -\t\t%s\n",
ndev->bar4_split ? "yes" : "no");
@ -1484,7 +1490,7 @@ static int xeon_setup_b2b_mw(struct intel_ntb_dev *ndev,
pdev = ndev_pdev(ndev);
mmio = ndev->self_mmio;
if (ndev->b2b_idx >= ndev->mw_count) {
if (ndev->b2b_idx == UINT_MAX) {
dev_dbg(ndev_dev(ndev), "not using b2b mw\n");
b2b_bar = 0;
ndev->b2b_off = 0;
@ -1776,6 +1782,13 @@ static int xeon_init_ntb(struct intel_ntb_dev *ndev)
else
ndev->b2b_idx = b2b_mw_idx;
if (ndev->b2b_idx >= ndev->mw_count) {
dev_dbg(ndev_dev(ndev),
"b2b_mw_idx %d invalid for mw_count %u\n",
b2b_mw_idx, ndev->mw_count);
return -EINVAL;
}
dev_dbg(ndev_dev(ndev),
"setting up b2b mw idx %d means %d\n",
b2b_mw_idx, ndev->b2b_idx);
@ -1843,6 +1856,9 @@ static int xeon_init_dev(struct intel_ntb_dev *ndev)
case PCI_DEVICE_ID_INTEL_NTB_SS_HSX:
case PCI_DEVICE_ID_INTEL_NTB_PS_HSX:
case PCI_DEVICE_ID_INTEL_NTB_B2B_HSX:
case PCI_DEVICE_ID_INTEL_NTB_SS_BDX:
case PCI_DEVICE_ID_INTEL_NTB_PS_BDX:
case PCI_DEVICE_ID_INTEL_NTB_B2B_BDX:
ndev->hwerr_flags |= NTB_HWERR_SDOORBELL_LOCKUP;
break;
}
@ -1857,6 +1873,9 @@ static int xeon_init_dev(struct intel_ntb_dev *ndev)
case PCI_DEVICE_ID_INTEL_NTB_SS_HSX:
case PCI_DEVICE_ID_INTEL_NTB_PS_HSX:
case PCI_DEVICE_ID_INTEL_NTB_B2B_HSX:
case PCI_DEVICE_ID_INTEL_NTB_SS_BDX:
case PCI_DEVICE_ID_INTEL_NTB_PS_BDX:
case PCI_DEVICE_ID_INTEL_NTB_B2B_BDX:
ndev->hwerr_flags |= NTB_HWERR_SB01BASE_LOCKUP;
break;
}
@ -1878,6 +1897,9 @@ static int xeon_init_dev(struct intel_ntb_dev *ndev)
case PCI_DEVICE_ID_INTEL_NTB_SS_HSX:
case PCI_DEVICE_ID_INTEL_NTB_PS_HSX:
case PCI_DEVICE_ID_INTEL_NTB_B2B_HSX:
case PCI_DEVICE_ID_INTEL_NTB_SS_BDX:
case PCI_DEVICE_ID_INTEL_NTB_PS_BDX:
case PCI_DEVICE_ID_INTEL_NTB_B2B_BDX:
ndev->hwerr_flags |= NTB_HWERR_B2BDOORBELL_BIT14;
break;
}
@ -1996,7 +2018,7 @@ static inline void ndev_init_struct(struct intel_ntb_dev *ndev,
ndev->ntb.ops = &intel_ntb_ops;
ndev->b2b_off = 0;
ndev->b2b_idx = INT_MAX;
ndev->b2b_idx = UINT_MAX;
ndev->bar4_split = 0;
@ -2234,14 +2256,17 @@ static const struct pci_device_id intel_ntb_pci_tbl[] = {
{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_B2B_SNB)},
{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_B2B_IVT)},
{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_B2B_HSX)},
{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_B2B_BDX)},
{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_PS_JSF)},
{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_PS_SNB)},
{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_PS_IVT)},
{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_PS_HSX)},
{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_PS_BDX)},
{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_SS_JSF)},
{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_SS_SNB)},
{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_SS_IVT)},
{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_SS_HSX)},
{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_SS_BDX)},
{0}
};
MODULE_DEVICE_TABLE(pci, intel_ntb_pci_tbl);

3
drivers/ntb/hw/intel/ntb_hw_intel.h
View file

@ -67,6 +67,9 @@
#define PCI_DEVICE_ID_INTEL_NTB_PS_HSX 0x2F0E
#define PCI_DEVICE_ID_INTEL_NTB_SS_HSX 0x2F0F
#define PCI_DEVICE_ID_INTEL_NTB_B2B_BWD 0x0C4E
#define PCI_DEVICE_ID_INTEL_NTB_B2B_BDX 0x6F0D
#define PCI_DEVICE_ID_INTEL_NTB_PS_BDX 0x6F0E
#define PCI_DEVICE_ID_INTEL_NTB_SS_BDX 0x6F0F
/* Intel Xeon hardware */

126
drivers/ntb/ntb_transport.c
View file

@ -119,7 +119,8 @@ struct ntb_transport_qp {
struct ntb_transport_ctx *transport;
struct ntb_dev *ndev;
void *cb_data;
struct dma_chan *dma_chan;
struct dma_chan *tx_dma_chan;
struct dma_chan *rx_dma_chan;
bool client_ready;
bool link_is_up;
@ -297,7 +298,7 @@ static LIST_HEAD(ntb_transport_list);
static int ntb_bus_init(struct ntb_transport_ctx *nt)
{
list_add(&nt->entry, &ntb_transport_list);
list_add_tail(&nt->entry, &ntb_transport_list);
return 0;
}
@ -452,7 +453,7 @@ static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count,
out_offset = 0;
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"NTB QP stats\n");
"\nNTB QP stats:\n\n");
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"rx_bytes - \t%llu\n", qp->rx_bytes);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
@ -470,11 +471,11 @@ static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count,
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"rx_err_ver - \t%llu\n", qp->rx_err_ver);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"rx_buff - \t%p\n", qp->rx_buff);
"rx_buff - \t0x%p\n", qp->rx_buff);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"rx_index - \t%u\n", qp->rx_index);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"rx_max_entry - \t%u\n", qp->rx_max_entry);
"rx_max_entry - \t%u\n\n", qp->rx_max_entry);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"tx_bytes - \t%llu\n", qp->tx_bytes);
@ -489,15 +490,32 @@ static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count,
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"tx_err_no_buf - %llu\n", qp->tx_err_no_buf);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"tx_mw - \t%p\n", qp->tx_mw);
"tx_mw - \t0x%p\n", qp->tx_mw);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"tx_index - \t%u\n", qp->tx_index);
"tx_index (H) - \t%u\n", qp->tx_index);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"RRI (T) - \t%u\n",
qp->remote_rx_info->entry);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"tx_max_entry - \t%u\n", qp->tx_max_entry);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"free tx - \t%u\n",
ntb_transport_tx_free_entry(qp));
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"\nQP Link %s\n",
"\n");
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"Using TX DMA - \t%s\n",
qp->tx_dma_chan ? "Yes" : "No");
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"Using RX DMA - \t%s\n",
qp->rx_dma_chan ? "Yes" : "No");
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"QP Link - \t%s\n",
qp->link_is_up ? "Up" : "Down");
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"\n");
if (out_offset > out_count)
out_offset = out_count;
@ -535,6 +553,7 @@ static struct ntb_queue_entry *ntb_list_rm(spinlock_t *lock,
}
entry = list_first_entry(list, struct ntb_queue_entry, entry);
list_del(&entry->entry);
out:
spin_unlock_irqrestore(lock, flags);
@ -1206,7 +1225,7 @@ static void ntb_async_rx(struct ntb_queue_entry *entry, void *offset)
{
struct dma_async_tx_descriptor *txd;
struct ntb_transport_qp *qp = entry->qp;
struct dma_chan *chan = qp->dma_chan;
struct dma_chan *chan = qp->rx_dma_chan;
struct dma_device *device;
size_t pay_off, buff_off, len;
struct dmaengine_unmap_data *unmap;
@ -1219,18 +1238,18 @@ static void ntb_async_rx(struct ntb_queue_entry *entry, void *offset)
goto err;
if (len < copy_bytes)
goto err_wait;
goto err;
device = chan->device;
pay_off = (size_t)offset & ~PAGE_MASK;
buff_off = (size_t)buf & ~PAGE_MASK;
if (!is_dma_copy_aligned(device, pay_off, buff_off, len))
goto err_wait;
goto err;
unmap = dmaengine_get_unmap_data(device->dev, 2, GFP_NOWAIT);
if (!unmap)
goto err_wait;
goto err;
unmap->len = len;
unmap->addr[0] = dma_map_page(device->dev, virt_to_page(offset),
@ -1273,12 +1292,6 @@ static void ntb_async_rx(struct ntb_queue_entry *entry, void *offset)
dmaengine_unmap_put(unmap);
err_get_unmap:
dmaengine_unmap_put(unmap);
err_wait:
/* If the callbacks come out of order, the writing of the index to the
* last completed will be out of order. This may result in the
* receive stalling forever.
*/
dma_sync_wait(chan, qp->last_cookie);
err:
ntb_memcpy_rx(entry, offset);
qp->rx_memcpy++;
@ -1373,8 +1386,8 @@ static void ntb_transport_rxc_db(unsigned long data)
break;
}
if (i && qp->dma_chan)
dma_async_issue_pending(qp->dma_chan);
if (i && qp->rx_dma_chan)
dma_async_issue_pending(qp->rx_dma_chan);
if (i == qp->rx_max_entry) {
/* there is more work to do */
@ -1441,7 +1454,7 @@ static void ntb_async_tx(struct ntb_transport_qp *qp,
{
struct ntb_payload_header __iomem *hdr;
struct dma_async_tx_descriptor *txd;
struct dma_chan *chan = qp->dma_chan;
struct dma_chan *chan = qp->tx_dma_chan;
struct dma_device *device;
size_t dest_off, buff_off;
struct dmaengine_unmap_data *unmap;
@ -1634,14 +1647,27 @@ ntb_transport_create_queue(void *data, struct device *client_dev,
dma_cap_set(DMA_MEMCPY, dma_mask);
if (use_dma) {
qp->dma_chan = dma_request_channel(dma_mask, ntb_dma_filter_fn,
(void *)(unsigned long)node);
if (!qp->dma_chan)
dev_info(&pdev->dev, "Unable to allocate DMA channel\n");
qp->tx_dma_chan =
dma_request_channel(dma_mask, ntb_dma_filter_fn,
(void *)(unsigned long)node);
if (!qp->tx_dma_chan)
dev_info(&pdev->dev, "Unable to allocate TX DMA channel\n");
qp->rx_dma_chan =
dma_request_channel(dma_mask, ntb_dma_filter_fn,
(void *)(unsigned long)node);
if (!qp->rx_dma_chan)
dev_info(&pdev->dev, "Unable to allocate RX DMA channel\n");
} else {
qp->dma_chan = NULL;
qp->tx_dma_chan = NULL;
qp->rx_dma_chan = NULL;
}
dev_dbg(&pdev->dev, "Using %s memcpy\n", qp->dma_chan ? "DMA" : "CPU");
dev_dbg(&pdev->dev, "Using %s memcpy for TX\n",
qp->tx_dma_chan ? "DMA" : "CPU");
dev_dbg(&pdev->dev, "Using %s memcpy for RX\n",
qp->rx_dma_chan ? "DMA" : "CPU");
for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) {
entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node);
@ -1676,8 +1702,10 @@ ntb_transport_create_queue(void *data, struct device *client_dev,
err1:
while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q)))
kfree(entry);
if (qp->dma_chan)
dma_release_channel(qp->dma_chan);
if (qp->tx_dma_chan)
dma_release_channel(qp->tx_dma_chan);
if (qp->rx_dma_chan)
dma_release_channel(qp->rx_dma_chan);
nt->qp_bitmap_free |= qp_bit;
err:
return NULL;
@ -1701,12 +1729,27 @@ void ntb_transport_free_queue(struct ntb_transport_qp *qp)
pdev = qp->ndev->pdev;
if (qp->dma_chan) {
struct dma_chan *chan = qp->dma_chan;
if (qp->tx_dma_chan) {
struct dma_chan *chan = qp->tx_dma_chan;
/* Putting the dma_chan to NULL will force any new traffic to be
* processed by the CPU instead of the DAM engine
*/
qp->dma_chan = NULL;
qp->tx_dma_chan = NULL;
/* Try to be nice and wait for any queued DMA engine
* transactions to process before smashing it with a rock
*/
dma_sync_wait(chan, qp->last_cookie);
dmaengine_terminate_all(chan);
dma_release_channel(chan);
}
if (qp->rx_dma_chan) {
struct dma_chan *chan = qp->rx_dma_chan;
/* Putting the dma_chan to NULL will force any new traffic to be
* processed by the CPU instead of the DAM engine
*/
qp->rx_dma_chan = NULL;
/* Try to be nice and wait for any queued DMA engine
* transactions to process before smashing it with a rock
@ -1843,7 +1886,7 @@ int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data,
entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q);
if (!entry) {
qp->tx_err_no_buf++;
return -ENOMEM;
return -EBUSY;
}
entry->cb_data = cb;
@ -1954,21 +1997,34 @@ EXPORT_SYMBOL_GPL(ntb_transport_qp_num);
unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp)
{
unsigned int max;
unsigned int copy_align;
if (!qp)
return 0;
if (!qp->dma_chan)
if (!qp->tx_dma_chan && !qp->rx_dma_chan)
return qp->tx_max_frame - sizeof(struct ntb_payload_header);
copy_align = max(qp->tx_dma_chan->device->copy_align,
qp->rx_dma_chan->device->copy_align);
/* If DMA engine usage is possible, try to find the max size for that */
max = qp->tx_max_frame - sizeof(struct ntb_payload_header);
max -= max % (1 << qp->dma_chan->device->copy_align);
max -= max % (1 << copy_align);
return max;
}
EXPORT_SYMBOL_GPL(ntb_transport_max_size);
unsigned int ntb_transport_tx_free_entry(struct ntb_transport_qp *qp)
{
unsigned int head = qp->tx_index;
unsigned int tail = qp->remote_rx_info->entry;
return tail > head ? tail - head : qp->tx_max_entry + tail - head;
}
EXPORT_SYMBOL_GPL(ntb_transport_tx_free_entry);
static void ntb_transport_doorbell_callback(void *data, int vector)
{
struct ntb_transport_ctx *nt = data;

9
include/linux/ntb.h
View file

@ -522,10 +522,9 @@ static inline int ntb_mw_clear_trans(struct ntb_dev *ntb, int idx)
* @speed: OUT - The link speed expressed as PCIe generation number.
* @width: OUT - The link width expressed as the number of PCIe lanes.
*
* Set the translation of a memory window. The peer may access local memory
* through the window starting at the address, up to the size. The address
* must be aligned to the alignment specified by ntb_mw_get_range(). The size
* must be aligned to the size alignment specified by ntb_mw_get_range().
* Get the current state of the ntb link. It is recommended to query the link
* state once after every link event. It is safe to query the link state in
* the context of the link event callback.
*
* Return: One if the link is up, zero if the link is down, otherwise a
* negative value indicating the error number.
@ -795,7 +794,7 @@ static inline int ntb_peer_db_set(struct ntb_dev *ntb, u64 db_bits)
}
/**
* ntb_peer_db_clear() - clear bits in the local doorbell register
* ntb_peer_db_clear() - clear bits in the peer doorbell register
* @ntb: NTB device context.
* @db_bits: Doorbell bits to clear.
*

1
include/linux/ntb_transport.h
View file

@ -83,3 +83,4 @@ void *ntb_transport_rx_remove(struct ntb_transport_qp *qp, unsigned int *len);
void ntb_transport_link_up(struct ntb_transport_qp *qp);
void ntb_transport_link_down(struct ntb_transport_qp *qp);
bool ntb_transport_link_query(struct ntb_transport_qp *qp);
unsigned int ntb_transport_tx_free_entry(struct ntb_transport_qp *qp);