kernel/linux.git/drivers/net/ethernet/microsoft, branch v6.12.80

net: mana: fix use-after-free in mana_hwc_destroy_channel() by reordering teardown

2026-03-25T10:08:53+00:00

[ Upstream commit fa103fc8f56954a60699a29215cb713448a39e87 ] A potential race condition exists in mana_hwc_destroy_channel() where hwc->caller_ctx is freed before the HWC's Completion Queue (CQ) and Event Queue (EQ) are destroyed. This allows an in-flight CQ interrupt handler to dereference freed memory, leading to a use-after-free or NULL pointer dereference in mana_hwc_handle_resp(). mana_smc_teardown_hwc() signals the hardware to stop but does not synchronize against IRQ handlers already executing on other CPUs. The IRQ synchronization only happens in mana_hwc_destroy_cq() via mana_gd_destroy_eq() -> mana_gd_deregister_irq(). Since this runs after kfree(hwc->caller_ctx), a concurrent mana_hwc_rx_event_handler() can dereference freed caller_ctx (and rxq->msg_buf) in mana_hwc_handle_resp(). Fix this by reordering teardown to reverse-of-creation order: destroy the TX/RX work queues and CQ/EQ before freeing hwc->caller_ctx. This ensures all in-flight interrupt handlers complete before the memory they access is freed. Fixes: ca9c54d2d6a5 ("net: mana: Add a driver for Microsoft Azure Network Adapter (MANA)") Reviewed-by: Haiyang Zhang Signed-off-by: Dipayaan Roy Reviewed-by: Simon Horman Link: https://patch.msgid.link/abHA3AjNtqa1nx9k@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin

net: mana: Ring doorbell at 4 CQ wraparounds

2026-03-25T10:08:35+00:00

commit dabffd08545ffa1d7183bc45e387860984025291 upstream. MANA hardware requires at least one doorbell ring every 8 wraparounds of the CQ. The driver rings the doorbell as a form of flow control to inform hardware that CQEs have been consumed. The NAPI poll functions mana_poll_tx_cq() and mana_poll_rx_cq() can poll up to CQE_POLLING_BUFFER (512) completions per call. If the CQ has fewer than 512 entries, a single poll call can process more than 4 wraparounds without ringing the doorbell. The doorbell threshold check also uses ">" instead of ">=", delaying the ring by one extra CQE beyond 4 wraparounds. Combined, these issues can cause the driver to exceed the 8-wraparound hardware limit, leading to missed completions and stalled queues. Fix this by capping the number of CQEs polled per call to 4 wraparounds of the CQ in both TX and RX paths. Also change the doorbell threshold from ">" to ">=" so the doorbell is rung as soon as 4 wraparounds are reached. Cc: stable@vger.kernel.org Fixes: 58a63729c957 ("net: mana: Fix doorbell out of order violation and avoid unnecessary doorbell rings") Signed-off-by: Long Li Reviewed-by: Haiyang Zhang Reviewed-by: Vadim Fedorenko Link: https://patch.msgid.link/20260226192833.1050807-1-longli@microsoft.com Signed-off-by: Jakub Kicinski Signed-off-by: Greg Kroah-Hartman

net: mana: Change the function signature of mana_get_primary_netdev_rcu

2026-02-06T15:55:51+00:00

commit a8445cfec101c42e9d64cdb2dac13973b22c205c upstream. Change mana_get_primary_netdev_rcu() to mana_get_primary_netdev(), and return the ndev with refcount held. The caller is responsible for dropping the refcount. Also drop the check for IFF_SLAVE as it is not necessary if the upper device is present. Signed-off-by: Long Li Link: https://patch.msgid.link/1741821332-9392-1-git-send-email-longli@linuxonhyperv.com Signed-off-by: Leon Romanovsky Fixes: 1df03a4b4414 ("RDMA/mana_ib: Set correct device into ib") Cc: stable@kernel.org Signed-off-by: Greg Kroah-Hartman

net: mana: Record doorbell physical address in PF mode

2025-07-17T16:37:22+00:00

[ Upstream commit e0fca6f2cebff539e9317a15a37dcf432e3b851a ] MANA supports RDMA in PF mode. The driver should record the doorbell physical address when in PF mode. The doorbell physical address is used by the RDMA driver to map doorbell pages of the device to user-mode applications through RDMA verbs interface. In the past, they have been mapped to user-mode while the device is in VF mode. With the support for PF mode implemented, also expose those pages in PF mode. Support for PF mode is implemented in 290e5d3c49f6 ("net: mana: Add support for Multi Vports on Bare metal") Signed-off-by: Long Li Reviewed-by: Simon Horman Link: https://patch.msgid.link/1750210606-12167-1-git-send-email-longli@linuxonhyperv.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin

net/mana: fix warning in the writer of client oob

2025-05-29T09:03:03+00:00

[ Upstream commit 5ec7e1c86c441c46a374577bccd9488abea30037 ] Do not warn on missing pad_data when oob is in sgl. Signed-off-by: Konstantin Taranov Link: https://patch.msgid.link/1737394039-28772-9-git-send-email-kotaranov@linux.microsoft.com Reviewed-by: Shiraz Saleem Reviewed-by: Long Li Signed-off-by: Leon Romanovsky Signed-off-by: Sasha Levin

net: mana: Switch to page pool for jumbo frames

2025-04-20T08:15:56+00:00

commit fa37a8849634db2dd3545116873da8cf4b1e67c6 upstream. Frag allocators, such as netdev_alloc_frag(), were not designed to work for fragsz > PAGE_SIZE. So, switch to page pool for jumbo frames instead of using page frag allocators. This driver is using page pool for smaller MTUs already. Cc: stable@vger.kernel.org Fixes: 80f6215b450e ("net: mana: Add support for jumbo frame") Signed-off-by: Haiyang Zhang Reviewed-by: Long Li Reviewed-by: Shradha Gupta Link: https://patch.msgid.link/1742920357-27263-1-git-send-email-haiyangz@microsoft.com Signed-off-by: Jakub Kicinski Signed-off-by: Greg Kroah-Hartman

net: mana: Support holes in device list reply msg

2025-03-28T21:03:28+00:00

commit 2fc8a346625eb1abfe202062c7e6a13d76cde5ea upstream. According to GDMA protocol, holes (zeros) are allowed at the beginning or middle of the gdma_list_devices_resp message. The existing code cannot properly handle this, and may miss some devices in the list. To fix, scan the entire list until the num_of_devs are found, or until the end of the list. Cc: stable@vger.kernel.org Fixes: ca9c54d2d6a5 ("net: mana: Add a driver for Microsoft Azure Network Adapter (MANA)") Signed-off-by: Haiyang Zhang Reviewed-by: Long Li Reviewed-by: Shradha Gupta Reviewed-by: Michal Swiatkowski Link: https://patch.msgid.link/1741723974-1534-1-git-send-email-haiyangz@microsoft.com Signed-off-by: Paolo Abeni Signed-off-by: Greg Kroah-Hartman

net: mana: Fix irq_contexts memory leak in mana_gd_setup_irqs

2024-12-19T17:13:18+00:00

[ Upstream commit 9a5beb6ca6305de5c5210efab0702ea79b62eb39 ] gc->irq_contexts is not freeded if one of the later operations fail. Suggested-by: Michael Kelley Fixes: 8afefc361209 ("net: mana: Assigning IRQ affinity on HT cores") Signed-off-by: Maxim Levitsky Reviewed-by: Michal Swiatkowski Reviewed-by: Kalesh AP Reviewed-by: Saurabh Sengar Reviewed-by: Yury Norov Link: https://patch.msgid.link/20241209175751.287738-3-mlevitsk@redhat.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin

net: mana: Fix memory leak in mana_gd_setup_irqs

2024-12-19T17:13:18+00:00

[ Upstream commit bb1e3eb57d2cc38951f9a9f1b8c298ced175798f ] Commit 8afefc361209 ("net: mana: Assigning IRQ affinity on HT cores") added memory allocation in mana_gd_setup_irqs of 'irqs' but the code doesn't free this temporary array in the success path. This was caught by kmemleak. Fixes: 8afefc361209 ("net: mana: Assigning IRQ affinity on HT cores") Signed-off-by: Maxim Levitsky Reviewed-by: Michal Swiatkowski Reviewed-by: Kalesh AP Reviewed-by: Saurabh Sengar Reviewed-by: Yury Norov Link: https://patch.msgid.link/20241209175751.287738-2-mlevitsk@redhat.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin

net :mana :Request a V2 response version for MANA_QUERY_GF_STAT

2024-12-14T19:03:21+00:00

commit 31f1b55d5d7e531cd827419e5d71c19f24de161c upstream. The current requested response version(V1) for MANA_QUERY_GF_STAT query results in STATISTICS_FLAGS_TX_ERRORS_GDMA_ERROR value being set to 0 always. In order to get the correct value for this counter we request the response version to be V2. Cc: stable@vger.kernel.org Fixes: e1df5202e879 ("net :mana :Add remaining GDMA stats for MANA to ethtool") Signed-off-by: Shradha Gupta Reviewed-by: Haiyang Zhang Link: https://patch.msgid.link/1733291300-12593-1-git-send-email-shradhagupta@linux.microsoft.com Signed-off-by: Paolo Abeni Signed-off-by: Greg Kroah-Hartman