- 10 Feb, 2021 1 commit
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Dan Carpenter authored
This error path leads to a Smatch warning: drivers/net/wireless/ath/ath11k/mac.c:4269 ath11k_mac_op_start() error: double unlocked '&ar->conf_mutex' (orig line 4251) We're not holding the lock when we do the "goto err;" so it leads to a double unlock. The fix is to hold the lock for a little longer. Fixes: c83c500b ("ath11k: enable idle power save mode") Signed-off-by:
Dan Carpenter <dan.carpenter@oracle.com> [kvalo@codeaurora.org: move also rcu_assign_pointer() call] Signed-off-by:
Kalle Valo <kvalo@codeaurora.org> Link: https://lore.kernel.org/r/YBk4GoeE+yc0wlJH@mwanda
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- 09 Feb, 2021 7 commits
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Max Chen authored
FW reports Tx/Rx extended MCS 12.1 to driver as "26". Driver will convert this into base MCS 7 + EXTENDED_SC_DMG flag so kernel can do the correct phy rate conversion. Also add log prints to print "12.1" instead of "26" for extended MCS. Signed-off-by:
Max Chen <mxchen@codeaurora.org> Signed-off-by:
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Tamizh Chelvam authored
Add new level ATH10K_DBG_STA debug_mask for printing sta related logs. This will be useful to check the debug logs of connection and changes related to station. Tested-on: QCA9984 hw1.0 PCI 10.4-3.9.0.2-00021 Signed-off-by:
Tamizh Chelvam <tamizhr@codeaurora.org> Signed-off-by:
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Arnd Bergmann authored
Multiple structures in the carl9170 driver have alignment impossible alignment constraints that gcc warns about when building with 'make W=1': drivers/net/wireless/ath/carl9170/fwcmd.h:243:2: warning: alignment 1 of 'union <anonymous>' is less than 4 [-Wpacked-not-aligned] drivers/net/wireless/ath/carl9170/wlan.h:373:1: warning: alignment 1 of 'struct ar9170_rx_frame_single' is less than 2 [-Wpacked-not-aligned] In the carl9170_cmd structure, multiple members that have an explicit alignment requirement of four bytes are added into a union with explicit byte alignment, but this in turn is part of a structure that also has four-byte alignment. In the wlan.h header, multiple structures contain a ieee80211_hdr member that is required to be two-byte aligned to avoid alignmnet faults when processing network headers, but all members are forced to be byte-aligned using the __packed tag at the end of the struct definition. In both cases, leaving out the packing does not change the internal layout of the structure but changes the alignment constraint of the structure itself. Change all affected structures to only apply packing where it does not violate the alignment requirement of the contained structure. Signed-off-by:
Arnd Bergmann <arnd@arndb.de> Acked-by:
Christian Lamparter <chunkeey@gmail.com> Signed-off-by:
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Loic Poulain authored
Deleting BA session was not correcly performed, causing communication issues with APs that dynamically stop/start new BA sessions. Signed-off-by:
Loic Poulain <loic.poulain@linaro.org> Signed-off-by:
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Karthikeyan Periyasamy authored
Tx descriptor search index field should be updated with hw peer id and not by AST Hash as per the HW/FW recommendation. Incorrect search index causes throughput degradation in all scenario for all the platforms. so updated the search index field with hw peer id, which is a common change applicable for all the platforms. Also no need of these configuration for non station type. seen 10% throughput increase in WDS traffic with this change. Tested-on: IPQ8074 hw2.0 AHB WLAN.HK.2.4.0.1-01492-QCAHKSWPL_SILICONZ-1 Signed-off-by:
Karthikeyan Periyasamy <periyasa@codeaurora.org> Signed-off-by:
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Anand K Mistry authored
ath10k_debug_fw_stats_request just be called with conf_mutex held, otherwise the following warning is seen when lock debugging is enabled: WARNING: CPU: 0 PID: 793 at drivers/net/wireless/ath/ath10k/debug.c:357 ath10k_debug_fw_stats_request+0x12c/0x133 [ath10k_core] Modules linked in: snd_hda_codec_hdmi designware_i2s snd_hda_intel snd_intel_dspcfg snd_hda_codec i2c_piix4 snd_hwdep snd_hda_core acpi_als kfifo_buf industrialio snd_soc_max98357a snd_soc_adau7002 snd_soc_acp_da7219mx98357_mach snd_soc_da7219 acp_audio_dma ccm xt_MASQUERADE fuse ath10k_pci ath10k_core lzo_rle ath lzo_compress mac80211 zram cfg80211 r8152 mii joydev CPU: 0 PID: 793 Comm: wpa_supplicant Tainted: G W 5.10.9 #5 Hardware name: HP Grunt/Grunt, BIOS Google_Grunt.11031.104.0 09/05/2019 RIP: 0010:ath10k_debug_fw_stats_request+0x12c/0x133 [ath10k_core] Code: 1e bb a1 ff ff ff 4c 89 ef 48 c7 c6 d3 31 2e c0 89 da 31 c0 e8 bd f8 ff ff 89 d8 eb 02 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> 0b e9 04 ff ff ff 0f 1f 44 00 00 55 48 89 e5 41 56 53 48 89 fb RSP: 0018:ffffb2478099f7d0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff9e432700cce0 RCX: 11c85cfd6b8e3b00 RDX: ffff9e432700cce0 RSI: ffff9e43127c5668 RDI: ffff9e4318deddf0 RBP: ffffb2478099f7f8 R08: 0000000000000002 R09: 00000003fd7068cc R10: ffffffffc01b2749 R11: ffffffffc029efaf R12: ffff9e432700c000 R13: ffff9e43127c33e0 R14: ffffb2478099f918 R15: ffff9e43127c33e0 FS: 00007f7ea48e2740(0000) GS:ffff9e432aa00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000059aa799ddf38 CR3: 0000000118de2000 CR4: 00000000001506f0 Call Trace: ath10k_sta_statistics+0x4d/0x270 [ath10k_core] sta_set_sinfo+0x1be/0xaec [mac80211] ieee80211_get_station+0x58/0x76 [mac80211] rdev_get_station+0xf1/0x11e [cfg80211] nl80211_get_station+0x7f/0x146 [cfg80211] genl_rcv_msg+0x32e/0x35e ? nl80211_stop_ap+0x19/0x19 [cfg80211] ? nl80211_get_station+0x146/0x146 [cfg80211] ? genl_rcv+0x19/0x36 ? genl_rcv+0x36/0x36 netlink_rcv_skb+0x89/0xfb genl_rcv+0x28/0x36 netlink_unicast+0x169/0x23b netlink_sendmsg+0x38a/0x402 sock_sendmsg+0x72/0x76 ____sys_sendmsg+0x153/0x1cc ? copy_msghdr_from_user+0x5d/0x85 ___sys_sendmsg+0x7c/0xb5 ? lock_acquire+0x181/0x23d ? syscall_trace_enter+0x15e/0x160 ? find_held_lock+0x3d/0xb2 ? syscall_trace_enter+0x15e/0x160 ? sched_clock_cpu+0x15/0xc6 __sys_sendmsg+0x62/0x9a do_syscall_64+0x43/0x55 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Fixes: 4913e675 ("ath10k: enable rx duration report default for wmi tlv") Signed-off-by:
Anand K Mistry <amistry@google.com> Signed-off-by:
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Anand K Mistry authored
The ieee80211_find_sta_by_ifaddr call in ath10k_wmi_tlv_parse_peer_stats_info must be called while holding the RCU read lock. Otherwise, the following warning will be seen when RCU usage checking is enabled: ============================= WARNING: suspicious RCU usage 5.10.3 #8 Tainted: G W ----------------------------- include/linux/rhashtable.h:594 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 no locks held by ksoftirqd/1/16. stack backtrace: CPU: 1 PID: 16 Comm: ksoftirqd/1 Tainted: G W 5.10.3 #8 Hardware name: HP Grunt/Grunt, BIOS Google_Grunt.11031.104.0 09/05/2019 Call Trace: dump_stack+0xab/0x115 sta_info_hash_lookup+0x71/0x1e9 [mac80211] ? lock_is_held_type+0xe6/0x12f ? __kasan_kmalloc+0xfb/0x112 ieee80211_find_sta_by_ifaddr+0x12/0x61 [mac80211] ath10k_wmi_tlv_parse_peer_stats_info+0xbd/0x10b [ath10k_core] ath10k_wmi_tlv_iter+0x8b/0x1a1 [ath10k_core] ? ath10k_wmi_tlv_iter+0x1a1/0x1a1 [ath10k_core] ath10k_wmi_tlv_event_peer_stats_info+0x103/0x13b [ath10k_core] ath10k_wmi_tlv_op_rx+0x722/0x80d [ath10k_core] ath10k_htc_rx_completion_handler+0x16e/0x1d7 [ath10k_core] ath10k_pci_process_rx_cb+0x116/0x22c [ath10k_pci] ? ath10k_htc_process_trailer+0x332/0x332 [ath10k_core] ? _raw_spin_unlock_irqrestore+0x34/0x61 ? lockdep_hardirqs_on+0x8e/0x12e ath10k_ce_per_engine_service+0x55/0x74 [ath10k_core] ath10k_ce_per_engine_service_any+0x76/0x84 [ath10k_core] ath10k_pci_napi_poll+0x49/0x141 [ath10k_pci] net_rx_action+0x11a/0x347 __do_softirq+0x2d3/0x539 run_ksoftirqd+0x4b/0x86 smpboot_thread_fn+0x1d0/0x2ab ? cpu_report_death+0x7f/0x7f kthread+0x189/0x191 ? cpu_report_death+0x7f/0x7f ? kthread_blkcg+0x31/0x31 ret_from_fork+0x22/0x30 Fixes: 0f7cb268 ("ath10k: add rx bitrate report for SDIO") Signed-off-by:
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- 08 Feb, 2021 22 commits
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Jiapeng Chong authored
Fix the following coccicheck warnings: ./include/linux/ssb/ssb_driver_gige.h:89:8-9: WARNING: return of 0/1 in function 'ssb_gige_one_dma_at_once' with return type bool. ./include/linux/ssb/ssb_driver_gige.h:79:8-9: WARNING: return of 0/1 in function 'ssb_gige_have_roboswitch' with return type bool. ./include/linux/ssb/ssb_driver_gige.h:182:8-9: WARNING: return of 0/1 in function 'ssb_gige_must_flush_posted_writes' with return type bool. ./include/linux/ssb/ssb_driver_gige.h:178:8-9: WARNING: return of 0/1 in function 'ssb_gige_one_dma_at_once' with return type bool. ./include/linux/ssb/ssb_driver_gige.h:174:8-9: WARNING: return of 0/1 in function 'ssb_gige_have_roboswitch' with return type bool. ./include/linux/ssb/ssb_driver_gige.h:170:8-9: WARNING: return of 0/1 in function 'ssb_gige_is_rgmii' with return type bool. ./include/linux/ssb/ssb_driver_gige.h:162:8-9: WARNING: return of 0/1 in function 'pdev_is_ssb_gige_core' with return type bool. Reported-by:
Abaci Robot <abaci@linux.alibaba.com> Signed-off-by:
Jiapeng Chong <jiapeng.chong@linux.alibaba.com> Acked-by:
Michael Büsch <m@bues.ch> Signed-off-by:
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Arnd Bergmann authored
sturct mwl8k_dma_data contains a ieee80211_hdr structure, which is required to have at least two byte alignment, and this conflicts with the __packed attribute: vers/net/wireless/marvell/mwl8k.c:811:1: warning: alignment 1 of 'struct mwl8k_dma_data' is less than 2 [-Wpacked-not-aligned] Mark mwl8k_dma_data itself as having two-byte alignment to ensure the inner structure is properly aligned. Signed-off-by:
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Arnd Bergmann authored
struct wl3501_80211_tx_hdr contains a ieee80211_hdr structure, which is required to have at least two byte alignment, and this conflicts with the __packed attribute: wireless/wl3501.h:553:1: warning: alignment 1 of 'struct wl3501_80211_tx_hdr' is less than 2 [-Wpacked-not-aligned] Mark wl3501_80211_tx_hdr itself as having two-byte alignment to ensure the inner structure is properly aligned. Signed-off-by:
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Stanislaw Gruszka authored
Add support for Sweex LW163V2 device. Signed-off-by:
Stanislaw Gruszka <stf_xl@wp.pl> Signed-off-by:
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Jiapeng Chong authored
Fix the following coccicheck warnings: ./drivers/net/wireless/intel/iwlegacy/4965-mac.c:2596:54-56: WARNING !A || A && B is equivalent to !A || B. Reported-by:
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wengjianfeng authored
remove duplicate word 'we' in comment change 'then' to 'than' in comment Signed-off-by:
wengjianfeng <wengjianfeng@yulong.com> Acked-by:
Randy Dunlap <rdunlap@infradead.org> Signed-off-by:
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wengjianfeng authored
INVALID_QUEUE has been used as a return value,it is not necessary to assign it to q_num,so just return INVALID_QUEUE. Signed-off-by:
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wengjianfeng authored
define refilled and then assign value to it, which should do that at the same time. Signed-off-by:
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wengjianfeng authored
-ENOMEM has been used as a return value,it is not necessary to assign it, and if kzalloc fail,not need free it,so just return -ENOMEM when kzalloc fail. Signed-off-by:
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Yen-lin Lai authored
When a network is moved or reconfigured on the different channel, there can be multiple BSSes with the same BSSID and SSID in scan result before the old one expires. Then, it can cause cfg80211_connect_result to map current_bss to a bss with the wrong channel. Let mwifiex_cfg80211_assoc return the selected BSS and then the caller can report it cfg80211_connect_bss. Signed-off-by:
Yen-lin Lai <yenlinlai@chromium.org> Reviewed-by:
Brian Norris <briannorris@chromium.org> Signed-off-by:
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wengjianfeng authored
at first, ret was assigned to zero, but later assigned to a funciton,so the assignment to zero is no use, which can simple be removed instead. Signed-off-by:
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Colin Ian King authored
The variable ret is being initialized with a value that is never read and it is being updated later with a new value. The initialization is redundant and can be removed. Addresses-Coverity: ("Unused value") Signed-off-by:Colin Ian King <colin.king@canonical.com> Signed-off-by:
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Zheng Yongjun authored
mutex lock can be initialized automatically with DEFINE_MUTEX() rather than explicitly calling mutex_init(). Signed-off-by:
Zheng Yongjun <zhengyongjun3@huawei.com> Signed-off-by:
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Arnd Bergmann authored
sturct d11txh contains a ieee80211_rts structure, which is required to have at least two byte alignment, and this conflicts with the __packed attribute: drivers/net/wireless/broadcom/brcm80211/brcmsmac/d11.h:786:1: warning: alignment 1 of 'struct d11txh' is less than 2 [-Wpacked-not-aligned] Mark d11txh itself as having two-byte alignment to ensure the inner structure is properly aligned. Signed-off-by:
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Hans de Goede authored
The Voyo winpad A15 tablet contains quite generic names in the sys_vendor and product_name DMI strings, without this patch brcmfmac will try to load: rcmfmac4330-sdio.To be filled by O.E.M.-To be filled by O.E.M..txt as nvram file which is a bit too generic. Add a DMI quirk so that a unique and clearly identifiable nvram file name is used on the Voyo winpad A15 tablet. While preparing a matching linux-firmware update I noticed that the nvram is identical to the nvram used on the Prowise-PT301 tablet, so the new DMI quirk entry simply points to the already existing Prowise-PT301 nvram file. Signed-off-by:
Hans de Goede <hdegoede@redhat.com> Signed-off-by:
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Hans de Goede authored
The Predia Basic tablet contains quite generic names in the sys_vendor and product_name DMI strings, without this patch brcmfmac will try to load: brcmfmac43340-sdio.Insyde-CherryTrail.txt as nvram file which is a bit too generic. Add a DMI quirk so that a unique and clearly identifiable nvram file name is used on the Predia Basic tablet. Signed-off-by:
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Guo-Feng Fan authored
RFE type2 is a new NIC which has one RF antenna shares with BT. Update phy parameter to verstion V57 to allow initial procedure to load extra AGC table for sharing antenna NIC. Signed-off-by:
Guo-Feng Fan <vincent_fann@realtek.com> Signed-off-by:
Ping-Ke Shih <pkshih@realtek.com> Tested-by:
Kai-Heng Feng <kai.heng.feng@canonical.com> Signed-off-by:
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Guo-Feng Fan authored
Incorrect CCK RSSI may cause periodically scan from upper layer. 8821c phy status does NOT has actual value of CCK power. It provides only lna and vga index. Driver have to use these indexes to calculate actual RSSI. Signed-off-by:
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Guo-Feng Fan authored
This patch fixes a defect that uses incorrect function to access registers. Use 8 and 32 bit access function to access 8 and 32 bit long data respectively. Signed-off-by:
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Colin Ian King authored
The variable rtstatu is being initialized with a value that is never read and it is being updated later with a new value. The initialization is redundant and can be removed. Addresses-Coverity: ("Unused value") Signed-off-by:Willem de Bruijn <willemb@google.com> Signed-off-by:
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Emil Renner Berthing authored
In commit d3ccc14d most of the tasklets in this driver was updated to the new API. However for the rx_work_tasklet only the type of the callback was changed from void _rtl_rx_work(unsigned long data) to void _rtl_rx_work(struct tasklet_struct *t). The initialization of rx_work_tasklet was still open-coded and the function pointer just cast into the old type, and hence nothing sets rx_work_tasklet.use_callback = true and the callback was still called as t->func(t->data); with uninitialized/zero t->data. Commit 6b8c7574 changed the casting of _rtl_rx_work a bit and initialized t->data to a pointer to the tasklet cast to an unsigned long. This way calling t->func(t->data) might actually work through all the casting, but it still doesn't update the code to use the new tasklet API. Let's use the new tasklet_setup to initialize rx_work_tasklet properly and set rx_work_tasklet.use_callback = true so that the callback is called as t->callback(t); without all the casting. Signed-off-by:
Emil Renner Berthing <kernel@esmil.dk> Acked-by:
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git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.gitKalle Valo authored
ath.git patches for v5.12. Major changes: ath10k * support setting SAR limits via nl80211
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- 07 Feb, 2021 1 commit
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git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queueJakub Kicinski authored
Tony Nguyen says: ==================== 100GbE Intel Wired LAN Driver Updates 2021-02-05 This series contains updates to ice driver only. Jake adds adds reporting of timeout length during devlink flash and implements support to report devlink info regarding the version of firmware that is stored (downloaded) to the device, but is not yet active. ice_devlink_info_get will report "stored" versions when there is no pending flash update. Version info includes the UNDI Option ROM, the Netlist module, and the fw.bundle_id. Gustavo A. R. Silva replaces a one-element array to flexible-array member. Bruce utilizes flex_array_size() helper and removes dead code on a check for a condition that can't occur. v2: * removed security revision implementation, and re-ordered patches to account for this removal * squashed patches implementing ice_read_flash_module to avoid patches refactoring the implementation of a previous patch in the series * modify ice_devlink_info_get to always report "stored" versions instead of only reporting them when a pending flash update is ready. * '100GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue: ice: remove dead code ice: use flex_array_size where possible ice: Replace one-element array with flexible-array member ice: display stored UNDI firmware version via devlink info ice: display stored netlist versions via devlink info ice: display some stored NVM versions via devlink info ice: introduce function for reading from flash modules ice: cache NVM module bank information ice: introduce context struct for info report ice: create flash_info structure and separate NVM version ice: report timeout length for erasing during devlink flash ==================== Link: https://lore.kernel.org/r/20210206044101.636242-1-anthony.l.nguyen@intel.comSigned-off-by:
Jakub Kicinski <kuba@kernel.org>
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- 06 Feb, 2021 9 commits
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git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-nextJakub Kicinski authored
Pablo Neira Ayuso says: ==================== Netfilter/IPVS updates for net-next 1) Remove indirection and use nf_ct_get() instead from nfnetlink_log and nfnetlink_queue, from Florian Westphal. 2) Add weighted random twos choice least-connection scheduling for IPVS, from Darby Payne. 3) Add a __hash placeholder in the flow tuple structure to identify the field to be included in the rhashtable key hash calculation. 4) Add a new nft_parse_register_load() and nft_parse_register_store() to consolidate register load and store in the core. 5) Statify nft_parse_register() since it has no more module clients. 6) Remove redundant assignment in nft_cmp, from Colin Ian King. * git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next: netfilter: nftables: remove redundant assignment of variable err netfilter: nftables: statify nft_parse_register() netfilter: nftables: add nft_parse_register_store() and use it netfilter: nftables: add nft_parse_register_load() and use it netfilter: flowtable: add hash offset field to tuple ipvs: add weighted random twos choice algorithm netfilter: ctnetlink: remove get_ct indirection ==================== Link: https://lore.kernel.org/r/20210206015005.23037-1-pablo@netfilter.orgSigned-off-by:
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Heiner Kallweit authored
There's no benefit in trying to disable interrupts if NAPI is scheduled already. This allows us to save a PCI write in this case. Signed-off-by:
Heiner Kallweit <hkallweit1@gmail.com> Link: https://lore.kernel.org/r/78c7f2fb-9772-1015-8c1d-632cbdff253f@gmail.comSigned-off-by:
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Xie He authored
The "dev_has_header" function, recently added in commit d5496990 ("net/packet: fix packet receive on L3 devices without visible hard header"), is more accurate as criteria for determining whether a device exposes the LL header to upper layers, because in addition to dev->header_ops, it also checks for dev->header_ops->create. When transmitting an skb on a device, dev_hard_header can be called to generate an LL header. dev_hard_header will only generate a header if dev->header_ops->create is present. Signed-off-by:
Xie He <xie.he.0141@gmail.com> Acked-by:
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Jakub Kicinski authored
Alex Elder says: ==================== net: ipa: a mix of small improvements Version 2 of this series restructures a couple of the changed functions (in patches 1 and 2) to avoid blocks of indented code by returning early when possible, as suggested by Jakub. The description of the first patch was changed as a result, to better reflect what the updated patch does. It also fixes one spot I identified when updating the code, where gsi_channel_stop() was doing the wrong thing on error. The original description for this series is below. This series contains a sort of unrelated set of code cleanups. The first two are things I wanted to do in a series that updated some NAPI code recently. I didn't want to change things in a way that affected existing testing so I set these aside for later (i.e., now). The third makes a change to event ring handling that's similar to what was done a while back for channels. There's little benefit to cacheing the current state of an event ring, so with this we'll just fetch the state from hardware whenever we need it. The fourth patch removes the definitions of two unused symbols. The fifth replaces a count that is always 0 or 1 with a Boolean. The sixth removes a build-time validation check that doesn't really provide benefit. And the last one fixes a problem (in two spots) that could cause a build-time check to fail "bogusly". ==================== Link: https://lore.kernel.org/r/20210205221100.1738-1-elder@linaro.orgSigned-off-by:
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Alex Elder authored
It's possible that the length passed to ipa_header_size_encoded() is larger than what can be represented by the HDR_LEN field alone (starting with IPA v4.5). If we attempted that, u32_encode_bits() would trigger a build-time error. Avoid this problem by masking off high-order bits of the value encoded as the lower portion of the header length. The same sort of problem exists in ipa_metadata_offset_encoded(), so implement the same fix there. Signed-off-by:
Alex Elder <elder@linaro.org> Signed-off-by:
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Alex Elder authored
There is a build-time check that the packet status structure is a multiple of 4 bytes in size. It's not clear where that constraint comes from, but the structure defines what hardware provides so its definition won't change. Get rid of the check; it adds no value. Signed-off-by:
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Alex Elder authored
The count argument to ipa_endpoint_replenish() is only ever 0 or 1, and always will be (because we always handle each receive buffer in a single transaction). Rename the argument to be add_one and change it to be Boolean. Update the function description to reflect the current code. Signed-off-by:
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Alex Elder authored
We do not support inter-EE channel or event ring commands. Inter-EE interrupts are disabled (and never re-enabled) for all channels and event rings, so we have no need for the GSI registers that clear those interrupt conditions. So remove their definitions. Signed-off-by:
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Alex Elder authored
An event ring's state only needs to be known when it is allocated, reset, or deallocated. We check an event ring's state both before and after performing an event ring control command that changes its state. These are only issued at startup and shutdown, so there is very little value in caching the state. Stop recording a copy of the channel's last known state, and instead fetch the true state from hardware whenever it's needed. In such cases, *do* record the state in a local variable, in case an error message reports it (so the value reported is the value seen). Signed-off-by:
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