[PATCH net-next 3/4] net: mana: Improve the HWC error handling
From: Dexuan Cui
Date: Fri Oct 29 2021 - 20:54:50 EST
Currently when the HWC creation fails, the error handling is flawed,
e.g. if mana_hwc_create_channel() -> mana_hwc_establish_channel() fails,
the resources acquired in mana_hwc_init_queues() is not released.
Enhance mana_hwc_destroy_channel() to do the proper cleanup work and
call it accordingly.
Signed-off-by: Dexuan Cui <decui@xxxxxxxxxxxxx>
---
.../net/ethernet/microsoft/mana/gdma_main.c | 4 --
.../net/ethernet/microsoft/mana/hw_channel.c | 71 ++++++++-----------
2 files changed, 31 insertions(+), 44 deletions(-)
diff --git a/drivers/net/ethernet/microsoft/mana/gdma_main.c b/drivers/net/ethernet/microsoft/mana/gdma_main.c
index 8a9ee2885f8c..599dfd5e6090 100644
--- a/drivers/net/ethernet/microsoft/mana/gdma_main.c
+++ b/drivers/net/ethernet/microsoft/mana/gdma_main.c
@@ -1330,8 +1330,6 @@ static int mana_gd_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
clean_up_gdma:
mana_hwc_destroy_channel(gc);
- vfree(gc->cq_table);
- gc->cq_table = NULL;
remove_irq:
mana_gd_remove_irqs(pdev);
unmap_bar:
@@ -1354,8 +1352,6 @@ static void mana_gd_remove(struct pci_dev *pdev)
mana_remove(&gc->mana);
mana_hwc_destroy_channel(gc);
- vfree(gc->cq_table);
- gc->cq_table = NULL;
mana_gd_remove_irqs(pdev);
diff --git a/drivers/net/ethernet/microsoft/mana/hw_channel.c b/drivers/net/ethernet/microsoft/mana/hw_channel.c
index c1310ea1c216..851de2b81fa4 100644
--- a/drivers/net/ethernet/microsoft/mana/hw_channel.c
+++ b/drivers/net/ethernet/microsoft/mana/hw_channel.c
@@ -309,9 +309,6 @@ static void mana_hwc_comp_event(void *ctx, struct gdma_queue *q_self)
static void mana_hwc_destroy_cq(struct gdma_context *gc, struct hwc_cq *hwc_cq)
{
- if (!hwc_cq)
- return;
-
kfree(hwc_cq->comp_buf);
if (hwc_cq->gdma_cq)
@@ -448,9 +445,6 @@ static void mana_hwc_dealloc_dma_buf(struct hw_channel_context *hwc,
static void mana_hwc_destroy_wq(struct hw_channel_context *hwc,
struct hwc_wq *hwc_wq)
{
- if (!hwc_wq)
- return;
-
mana_hwc_dealloc_dma_buf(hwc, hwc_wq->msg_buf);
if (hwc_wq->gdma_wq)
@@ -623,6 +617,7 @@ static int mana_hwc_establish_channel(struct gdma_context *gc, u16 *q_depth,
*max_req_msg_size = hwc->hwc_init_max_req_msg_size;
*max_resp_msg_size = hwc->hwc_init_max_resp_msg_size;
+ /* Both were set in mana_hwc_init_event_handler(). */
if (WARN_ON(cq->id >= gc->max_num_cqs))
return -EPROTO;
@@ -638,9 +633,6 @@ static int mana_hwc_establish_channel(struct gdma_context *gc, u16 *q_depth,
static int mana_hwc_init_queues(struct hw_channel_context *hwc, u16 q_depth,
u32 max_req_msg_size, u32 max_resp_msg_size)
{
- struct hwc_wq *hwc_rxq = NULL;
- struct hwc_wq *hwc_txq = NULL;
- struct hwc_cq *hwc_cq = NULL;
int err;
err = mana_hwc_init_inflight_msg(hwc, q_depth);
@@ -653,44 +645,32 @@ static int mana_hwc_init_queues(struct hw_channel_context *hwc, u16 q_depth,
err = mana_hwc_create_cq(hwc, q_depth * 2,
mana_hwc_init_event_handler, hwc,
mana_hwc_rx_event_handler, hwc,
- mana_hwc_tx_event_handler, hwc, &hwc_cq);
+ mana_hwc_tx_event_handler, hwc, &hwc->cq);
if (err) {
dev_err(hwc->dev, "Failed to create HWC CQ: %d\n", err);
goto out;
}
- hwc->cq = hwc_cq;
err = mana_hwc_create_wq(hwc, GDMA_RQ, q_depth, max_req_msg_size,
- hwc_cq, &hwc_rxq);
+ hwc->cq, &hwc->rxq);
if (err) {
dev_err(hwc->dev, "Failed to create HWC RQ: %d\n", err);
goto out;
}
- hwc->rxq = hwc_rxq;
err = mana_hwc_create_wq(hwc, GDMA_SQ, q_depth, max_resp_msg_size,
- hwc_cq, &hwc_txq);
+ hwc->cq, &hwc->txq);
if (err) {
dev_err(hwc->dev, "Failed to create HWC SQ: %d\n", err);
goto out;
}
- hwc->txq = hwc_txq;
hwc->num_inflight_msg = q_depth;
hwc->max_req_msg_size = max_req_msg_size;
return 0;
out:
- if (hwc_txq)
- mana_hwc_destroy_wq(hwc, hwc_txq);
-
- if (hwc_rxq)
- mana_hwc_destroy_wq(hwc, hwc_rxq);
-
- if (hwc_cq)
- mana_hwc_destroy_cq(hwc->gdma_dev->gdma_context, hwc_cq);
-
- mana_gd_free_res_map(&hwc->inflight_msg_res);
+ /* mana_hwc_create_channel() will do the cleanup.*/
return err;
}
@@ -718,6 +698,9 @@ int mana_hwc_create_channel(struct gdma_context *gc)
gd->pdid = INVALID_PDID;
gd->doorbell = INVALID_DOORBELL;
+ /* mana_hwc_init_queues() only creates the required data structures,
+ * and doesn't touch the HWC device.
+ */
err = mana_hwc_init_queues(hwc, HW_CHANNEL_VF_BOOTSTRAP_QUEUE_DEPTH,
HW_CHANNEL_MAX_REQUEST_SIZE,
HW_CHANNEL_MAX_RESPONSE_SIZE);
@@ -743,42 +726,50 @@ int mana_hwc_create_channel(struct gdma_context *gc)
return 0;
out:
- kfree(hwc);
+ mana_hwc_destroy_channel(gc);
return err;
}
void mana_hwc_destroy_channel(struct gdma_context *gc)
{
struct hw_channel_context *hwc = gc->hwc.driver_data;
- struct hwc_caller_ctx *ctx;
- mana_smc_teardown_hwc(&gc->shm_channel, false);
+ if (!hwc)
+ return;
+
+ /* gc->max_num_cqs is set in mana_hwc_init_event_handler(). If it's
+ * non-zero, the HWC worked and we should tear down the HWC here.
+ */
+ if (gc->max_num_cqs > 0) {
+ mana_smc_teardown_hwc(&gc->shm_channel, false);
+ gc->max_num_cqs = 0;
+ }
- ctx = hwc->caller_ctx;
- kfree(ctx);
+ kfree(hwc->caller_ctx);
hwc->caller_ctx = NULL;
- mana_hwc_destroy_wq(hwc, hwc->txq);
- hwc->txq = NULL;
+ if (hwc->txq)
+ mana_hwc_destroy_wq(hwc, hwc->txq);
- mana_hwc_destroy_wq(hwc, hwc->rxq);
- hwc->rxq = NULL;
+ if (hwc->rxq)
+ mana_hwc_destroy_wq(hwc, hwc->rxq);
- mana_hwc_destroy_cq(hwc->gdma_dev->gdma_context, hwc->cq);
- hwc->cq = NULL;
+ if (hwc->cq)
+ mana_hwc_destroy_cq(hwc->gdma_dev->gdma_context, hwc->cq);
mana_gd_free_res_map(&hwc->inflight_msg_res);
hwc->num_inflight_msg = 0;
- if (hwc->gdma_dev->pdid != INVALID_PDID) {
- hwc->gdma_dev->doorbell = INVALID_DOORBELL;
- hwc->gdma_dev->pdid = INVALID_PDID;
- }
+ hwc->gdma_dev->doorbell = INVALID_DOORBELL;
+ hwc->gdma_dev->pdid = INVALID_PDID;
kfree(hwc);
gc->hwc.driver_data = NULL;
gc->hwc.gdma_context = NULL;
+
+ vfree(gc->cq_table);
+ gc->cq_table = NULL;
}
int mana_hwc_send_request(struct hw_channel_context *hwc, u32 req_len,
--
2.17.1