kernel.git/drivers/net/ethernet/microsoft, branch linux-6.4.y

RDMA/mana_ib: Use v2 version of cfg_rx_steer_req to enable RX coalescing

2023-08-23T15:32:26Z

[ Upstream commit 2145328515c8fa9b8a9f7889250bc6c032f2a0e6 ] With RX coalescing, one CQE entry can be used to indicate multiple packets on the receive queue. This saves processing time and PCI bandwidth over the CQ. The MANA Ethernet driver also uses the v2 version of the protocol. It doesn't use RX coalescing and its behavior is not changed. Link: https://lore.kernel.org/r/1684045095-31228-1-git-send-email-longli@linuxonhyperv.com Signed-off-by: Long Li Signed-off-by: Jason Gunthorpe Signed-off-by: Sasha Levin

net: mana: Fix MANA VF unload when hardware is unresponsive

2023-08-16T16:32:17Z

commit a7dfeda6fdeccab4c7c3dce9a72c4262b9530c80 upstream. When unloading the MANA driver, mana_dealloc_queues() waits for the MANA hardware to complete any inflight packets and set the pending send count to zero. But if the hardware has failed, mana_dealloc_queues() could wait forever. Fix this by adding a timeout to the wait. Set the timeout to 120 seconds, which is a somewhat arbitrary value that is more than long enough for functional hardware to complete any sends. Cc: stable@vger.kernel.org Fixes: ca9c54d2d6a5 ("net: mana: Add a driver for Microsoft Azure Network Adapter (MANA)") Signed-off-by: Souradeep Chakrabarti Link: https://lore.kernel.org/r/1691576525-24271-1-git-send-email-schakrabarti@linux.microsoft.com Signed-off-by: Jakub Kicinski Signed-off-by: Greg Kroah-Hartman

net: mana: Fix perf regression: remove rx_cqes, tx_cqes counters

2023-05-30T10:05:22Z

The apc->eth_stats.rx_cqes is one per NIC (vport), and it's on the frequent and parallel code path of all queues. So, r/w into this single shared variable by many threads on different CPUs creates a lot caching and memory overhead, hence perf regression. And, it's not accurate due to the high volume concurrent r/w. For example, a workload is iperf with 128 threads, and with RPS enabled. We saw perf regression of 25% with the previous patch adding the counters. And this patch eliminates the regression. Since the error path of mana_poll_rx_cq() already has warnings, so keeping the counter and convert it to a per-queue variable is not necessary. So, just remove this counter from this high frequency code path. Also, remove the tx_cqes counter for the same reason. We have warnings & other counters for errors on that path, and don't need to count every normal cqe processing. Cc: stable@vger.kernel.org Fixes: bd7fc6e1957c ("net: mana: Add new MANA VF performance counters for easier troubleshooting") Signed-off-by: Haiyang Zhang Reviewed-by: Horatiu Vultur Reviewed-by: Jiri Pirko Link: https://lore.kernel.org/r/1685115537-31675-1-git-send-email-haiyangz@microsoft.com Signed-off-by: Paolo Abeni

net: mana: Check if netdev/napi_alloc_frag returns single page

2023-04-25T01:08:34Z

netdev/napi_alloc_frag() may fall back to single page which is smaller than the requested size. Add error checking to avoid memory overwritten. Signed-off-by: Haiyang Zhang Signed-off-by: Jakub Kicinski

net: mana: Rename mana_refill_rxoob and remove some empty lines

2023-04-25T01:08:34Z

Rename mana_refill_rxoob for naming consistency. And remove some empty lines between function call and error checking. Signed-off-by: Haiyang Zhang Signed-off-by: Jakub Kicinski

net: mana: Add support for jumbo frame

2023-04-14T07:56:19Z

During probe, get the hardware-allowed max MTU by querying the device configuration. Users can select MTU up to the device limit. When XDP is in use, limit MTU settings so the buffer size is within one page. And, when MTU is set to a too large value, XDP is not allowed to run. Also, to prevent changing MTU fails, and leaves the NIC in a bad state, pre-allocate all buffers before starting the change. So in low memory condition, it will return error, without affecting the NIC. Signed-off-by: Haiyang Zhang Reviewed-by: Jesse Brandeburg Signed-off-by: David S. Miller

net: mana: Enable RX path to handle various MTU sizes

2023-04-14T07:56:19Z

Update RX data path to allocate and use RX queue DMA buffers with proper size based on potentially various MTU sizes. Signed-off-by: Haiyang Zhang Reviewed-by: Jesse Brandeburg Signed-off-by: David S. Miller

net: mana: Refactor RX buffer allocation code to prepare for various MTU

2023-04-14T07:56:19Z

Move out common buffer allocation code from mana_process_rx_cqe() and mana_alloc_rx_wqe() to helper functions. Refactor related variables so they can be changed in one place, and buffer sizes are in sync. Signed-off-by: Haiyang Zhang Reviewed-by: Jesse Brandeburg Signed-off-by: David S. Miller

net: mana: Use napi_build_skb in RX path

2023-04-14T07:56:19Z

Use napi_build_skb() instead of build_skb() to take advantage of the NAPI percpu caches to obtain skbuff_head. Signed-off-by: Haiyang Zhang Reviewed-by: Jesse Brandeburg Signed-off-by: David S. Miller

net: mana: Remove redundant pci_clear_master

2023-03-24T09:09:27Z

Remove pci_clear_master to simplify the code, the bus-mastering is also cleared in do_pci_disable_device, like this: ./drivers/pci/pci.c:2197 static void do_pci_disable_device(struct pci_dev *dev) { u16 pci_command; pci_read_config_word(dev, PCI_COMMAND, &pci_command); if (pci_command & PCI_COMMAND_MASTER) { pci_command &= ~PCI_COMMAND_MASTER; pci_write_config_word(dev, PCI_COMMAND, pci_command); } pcibios_disable_device(dev); }. And dev->is_busmaster is set to 0 in pci_disable_device. Signed-off-by: Cai Huoqing Signed-off-by: David S. Miller