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Message-ID: <20240307174843.1719130-1-leitao@debian.org>
Date: Thu, 7 Mar 2024 09:48:31 -0800
From: Breno Leitao <leitao@...ian.org>
To: linux-wireless@...r.kernel.org,
johannes.berg@...el.com,
gregory.greenman@...el.com,
Miri Korenblit <miriam.rachel.korenblit@...el.com>,
Kalle Valo <kvalo@...nel.org>
Cc: kuba@...nel.org,
keescook@...omium.org,
Alon Giladi <alon.giladi@...el.com>,
Benjamin Berg <benjamin.berg@...el.com>,
Anjaneyulu <pagadala.yesu.anjaneyulu@...el.com>,
Avraham Stern <avraham.stern@...el.com>,
Christian Marangi <ansuelsmth@...il.com>,
linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] wifi: iwlwifi: pcie: allocate dummy net_device dynamically
struct net_device shouldn't be embedded into any structure, instead,
the owner should use the priv space to embed their state into net_device.
Embedding net_device into structures prohibits the usage of flexible
arrays in the net_device structure. For more details, see the discussion
at [1].
Un-embed the net_device from struct iwl_trans_pcie by converting it
into a pointer. Then use the leverage alloc_netdev() to allocate the
net_device object at iwl_trans_pcie_alloc.
The private data of net_device becomes a pointer for the struct
iwl_trans_pcie, so, it is easy to get back to the iwl_trans_pcie parent
given the net_device object.
[1] https://lore.kernel.org/all/20240229225910.79e224cf@kernel.org/
Signed-off-by: Breno Leitao <leitao@...ian.org>
---
.../wireless/intel/iwlwifi/pcie/internal.h | 2 +-
drivers/net/wireless/intel/iwlwifi/pcie/rx.c | 11 +++++--
.../net/wireless/intel/iwlwifi/pcie/trans.c | 29 +++++++++++++------
3 files changed, 29 insertions(+), 13 deletions(-)
diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/internal.h b/drivers/net/wireless/intel/iwlwifi/pcie/internal.h
index 7805a42948af..a7eebe400b5b 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/internal.h
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/internal.h
@@ -386,7 +386,7 @@ struct iwl_trans_pcie {
dma_addr_t iml_dma_addr;
struct iwl_trans *trans;
- struct net_device napi_dev;
+ struct net_device *napi_dev;
/* INT ICT Table */
__le32 *ict_tbl;
diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/rx.c b/drivers/net/wireless/intel/iwlwifi/pcie/rx.c
index 9c2461ba13c5..984d7bcd381f 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/rx.c
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/rx.c
@@ -1000,6 +1000,11 @@ void iwl_pcie_rx_init_rxb_lists(struct iwl_rxq *rxq)
static int iwl_pcie_rx_handle(struct iwl_trans *trans, int queue, int budget);
+static inline struct iwl_trans_pcie *iwl_netdev_to_trans_pcie(struct net_device *dev)
+{
+ return *(struct iwl_trans_pcie **)netdev_priv(dev);
+}
+
static int iwl_pcie_napi_poll(struct napi_struct *napi, int budget)
{
struct iwl_rxq *rxq = container_of(napi, struct iwl_rxq, napi);
@@ -1007,7 +1012,7 @@ static int iwl_pcie_napi_poll(struct napi_struct *napi, int budget)
struct iwl_trans *trans;
int ret;
- trans_pcie = container_of(napi->dev, struct iwl_trans_pcie, napi_dev);
+ trans_pcie = iwl_netdev_to_trans_pcie(napi->dev);
trans = trans_pcie->trans;
ret = iwl_pcie_rx_handle(trans, rxq->id, budget);
@@ -1034,7 +1039,7 @@ static int iwl_pcie_napi_poll_msix(struct napi_struct *napi, int budget)
struct iwl_trans *trans;
int ret;
- trans_pcie = container_of(napi->dev, struct iwl_trans_pcie, napi_dev);
+ trans_pcie = iwl_netdev_to_trans_pcie(napi->dev);
trans = trans_pcie->trans;
ret = iwl_pcie_rx_handle(trans, rxq->id, budget);
@@ -1131,7 +1136,7 @@ static int _iwl_pcie_rx_init(struct iwl_trans *trans)
if (trans_pcie->msix_enabled)
poll = iwl_pcie_napi_poll_msix;
- netif_napi_add(&trans_pcie->napi_dev, &rxq->napi,
+ netif_napi_add(trans_pcie->napi_dev, &rxq->napi,
poll);
napi_enable(&rxq->napi);
}
diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
index 6c76b2dd6878..e5af3d7dfbb1 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
@@ -1986,13 +1986,6 @@ static void iwl_trans_pcie_configure(struct iwl_trans *trans,
trans->command_groups = trans_cfg->command_groups;
trans->command_groups_size = trans_cfg->command_groups_size;
- /* Initialize NAPI here - it should be before registering to mac80211
- * in the opmode but after the HW struct is allocated.
- * As this function may be called again in some corner cases don't
- * do anything if NAPI was already initialized.
- */
- if (trans_pcie->napi_dev.reg_state != NETREG_DUMMY)
- init_dummy_netdev(&trans_pcie->napi_dev);
trans_pcie->fw_reset_handshake = trans_cfg->fw_reset_handshake;
}
@@ -2057,6 +2050,8 @@ void iwl_trans_pcie_free(struct iwl_trans *trans)
iwl_pcie_tx_free(trans);
iwl_pcie_rx_free(trans);
+ free_netdev(trans_pcie->napi_dev);
+
if (trans_pcie->rba.alloc_wq) {
destroy_workqueue(trans_pcie->rba.alloc_wq);
trans_pcie->rba.alloc_wq = NULL;
@@ -3594,7 +3589,7 @@ struct iwl_trans *iwl_trans_pcie_alloc(struct pci_dev *pdev,
const struct pci_device_id *ent,
const struct iwl_cfg_trans_params *cfg_trans)
{
- struct iwl_trans_pcie *trans_pcie;
+ struct iwl_trans_pcie *trans_pcie, **priv;
struct iwl_trans *trans;
int ret, addr_size;
const struct iwl_trans_ops *ops = &trans_ops_pcie_gen2;
@@ -3623,6 +3618,20 @@ struct iwl_trans *iwl_trans_pcie_alloc(struct pci_dev *pdev,
trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
+ /* Initialize NAPI here - it should be before registering to mac80211
+ * in the opmode but after the HW struct is allocated.
+ */
+ trans_pcie->napi_dev = alloc_netdev(sizeof(struct iwl_trans_pcie *),
+ "dummy", NET_NAME_UNKNOWN,
+ init_dummy_netdev);
+ if (!trans_pcie->napi_dev) {
+ ret = -ENOMEM;
+ goto out_free_trans;
+ }
+ /* The private struct in netdev is a pointer to struct iwl_trans_pcie */
+ priv = netdev_priv(trans_pcie->napi_dev);
+ *priv = trans_pcie;
+
trans_pcie->trans = trans;
trans_pcie->opmode_down = true;
spin_lock_init(&trans_pcie->irq_lock);
@@ -3637,7 +3646,7 @@ struct iwl_trans *iwl_trans_pcie_alloc(struct pci_dev *pdev,
WQ_HIGHPRI | WQ_UNBOUND, 0);
if (!trans_pcie->rba.alloc_wq) {
ret = -ENOMEM;
- goto out_free_trans;
+ goto out_free_ndev;
}
INIT_WORK(&trans_pcie->rba.rx_alloc, iwl_pcie_rx_allocator_work);
@@ -3757,6 +3766,8 @@ struct iwl_trans *iwl_trans_pcie_alloc(struct pci_dev *pdev,
iwl_pcie_free_ict(trans);
out_no_pci:
destroy_workqueue(trans_pcie->rba.alloc_wq);
+out_free_ndev:
+ free_netdev(trans_pcie->napi_dev);
out_free_trans:
iwl_trans_free(trans);
return ERR_PTR(ret);
--
2.43.0
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