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authorLinus Torvalds <torvalds@linux-foundation.org>2023-09-09 11:30:16 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2023-09-09 11:30:16 -0700
commitfa9d4bf5b738a7fa852bbeabfd8889b127ca3193 (patch)
tree29e88ca110a8f9e1d34a8ab589edd0a34ad15870 /drivers
parent6099776f9f268e61fe5ecd721f994a8cfce5306f (diff)
parent643982232860887fed493144957ea5794b6557d1 (diff)
Merge tag 'ntb-6.6' of https://github.com/jonmason/ntb
Pull NTB updates from Jon Mason: "Link toggling fixes and debugfs error path fixes" [ And for everybody like me who always have to remind themselves what the TLA of the day is, and what NTB stands for - it's a PCIe "Non-Transparent Bridge" thing - Linus ] * tag 'ntb-6.6' of https://github.com/jonmason/ntb: ntb: Check tx descriptors outstanding instead of head/tail for tx queue ntb: Fix calculation ntb_transport_tx_free_entry() ntb: Drop packets when qp link is down ntb: Clean up tx tail index on link down ntb: amd: Drop unnecessary error check for debugfs_create_dir NTB: ntb_tool: Switch to memdup_user_nul() helper dtivers: ntb: fix parameter check in perf_setup_dbgfs() ntb: Remove error checking for debugfs_create_dir()
Diffstat (limited to 'drivers')
-rw-r--r--drivers/ntb/hw/amd/ntb_hw_amd.c11
-rw-r--r--drivers/ntb/ntb_transport.c21
-rw-r--r--drivers/ntb/test/ntb_perf.c2
-rw-r--r--drivers/ntb/test/ntb_tool.c15
4 files changed, 24 insertions, 25 deletions
diff --git a/drivers/ntb/hw/amd/ntb_hw_amd.c b/drivers/ntb/hw/amd/ntb_hw_amd.c
index 4940b6301d83..d687e8c2cc78 100644
--- a/drivers/ntb/hw/amd/ntb_hw_amd.c
+++ b/drivers/ntb/hw/amd/ntb_hw_amd.c
@@ -941,13 +941,10 @@ static void ndev_init_debugfs(struct amd_ntb_dev *ndev)
ndev->debugfs_dir =
debugfs_create_dir(pci_name(ndev->ntb.pdev),
debugfs_dir);
- if (IS_ERR(ndev->debugfs_dir))
- ndev->debugfs_info = NULL;
- else
- ndev->debugfs_info =
- debugfs_create_file("info", S_IRUSR,
- ndev->debugfs_dir, ndev,
- &amd_ntb_debugfs_info);
+ ndev->debugfs_info =
+ debugfs_create_file("info", S_IRUSR,
+ ndev->debugfs_dir, ndev,
+ &amd_ntb_debugfs_info);
}
}
diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c
index 2abd2235bbca..f9e7847a378e 100644
--- a/drivers/ntb/ntb_transport.c
+++ b/drivers/ntb/ntb_transport.c
@@ -909,7 +909,7 @@ static int ntb_set_mw(struct ntb_transport_ctx *nt, int num_mw,
return 0;
}
-static void ntb_qp_link_down_reset(struct ntb_transport_qp *qp)
+static void ntb_qp_link_context_reset(struct ntb_transport_qp *qp)
{
qp->link_is_up = false;
qp->active = false;
@@ -932,6 +932,13 @@ static void ntb_qp_link_down_reset(struct ntb_transport_qp *qp)
qp->tx_async = 0;
}
+static void ntb_qp_link_down_reset(struct ntb_transport_qp *qp)
+{
+ ntb_qp_link_context_reset(qp);
+ if (qp->remote_rx_info)
+ qp->remote_rx_info->entry = qp->rx_max_entry - 1;
+}
+
static void ntb_qp_link_cleanup(struct ntb_transport_qp *qp)
{
struct ntb_transport_ctx *nt = qp->transport;
@@ -1174,7 +1181,7 @@ static int ntb_transport_init_queue(struct ntb_transport_ctx *nt,
qp->ndev = nt->ndev;
qp->client_ready = false;
qp->event_handler = NULL;
- ntb_qp_link_down_reset(qp);
+ ntb_qp_link_context_reset(qp);
if (mw_num < qp_count % mw_count)
num_qps_mw = qp_count / mw_count + 1;
@@ -1894,7 +1901,7 @@ err:
static int ntb_process_tx(struct ntb_transport_qp *qp,
struct ntb_queue_entry *entry)
{
- if (qp->tx_index == qp->remote_rx_info->entry) {
+ if (!ntb_transport_tx_free_entry(qp)) {
qp->tx_ring_full++;
return -EAGAIN;
}
@@ -2276,9 +2283,13 @@ int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data,
struct ntb_queue_entry *entry;
int rc;
- if (!qp || !qp->link_is_up || !len)
+ if (!qp || !len)
return -EINVAL;
+ /* If the qp link is down already, just ignore. */
+ if (!qp->link_is_up)
+ return 0;
+
entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q);
if (!entry) {
qp->tx_err_no_buf++;
@@ -2418,7 +2429,7 @@ 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;
+ return tail >= head ? tail - head : qp->tx_max_entry + tail - head;
}
EXPORT_SYMBOL_GPL(ntb_transport_tx_free_entry);
diff --git a/drivers/ntb/test/ntb_perf.c b/drivers/ntb/test/ntb_perf.c
index 65e1e5cf1b29..553f1f46bc66 100644
--- a/drivers/ntb/test/ntb_perf.c
+++ b/drivers/ntb/test/ntb_perf.c
@@ -1355,7 +1355,7 @@ static void perf_setup_dbgfs(struct perf_ctx *perf)
struct pci_dev *pdev = perf->ntb->pdev;
perf->dbgfs_dir = debugfs_create_dir(pci_name(pdev), perf_dbgfs_topdir);
- if (!perf->dbgfs_dir) {
+ if (IS_ERR(perf->dbgfs_dir)) {
dev_warn(&perf->ntb->dev, "DebugFS unsupported\n");
return;
}
diff --git a/drivers/ntb/test/ntb_tool.c b/drivers/ntb/test/ntb_tool.c
index eeeb4b1c97d2..641cb7e05a47 100644
--- a/drivers/ntb/test/ntb_tool.c
+++ b/drivers/ntb/test/ntb_tool.c
@@ -370,16 +370,9 @@ static ssize_t tool_fn_write(struct tool_ctx *tc,
if (*offp)
return 0;
- buf = kmalloc(size + 1, GFP_KERNEL);
- if (!buf)
- return -ENOMEM;
-
- if (copy_from_user(buf, ubuf, size)) {
- kfree(buf);
- return -EFAULT;
- }
-
- buf[size] = 0;
+ buf = memdup_user_nul(ubuf, size);
+ if (IS_ERR(buf))
+ return PTR_ERR(buf);
n = sscanf(buf, "%c %lli", &cmd, &bits);
@@ -1495,8 +1488,6 @@ static void tool_setup_dbgfs(struct tool_ctx *tc)
tc->dbgfs_dir = debugfs_create_dir(dev_name(&tc->ntb->dev),
tool_dbgfs_topdir);
- if (!tc->dbgfs_dir)
- return;
debugfs_create_file("port", 0600, tc->dbgfs_dir,
tc, &tool_port_fops);