On Wed, 28 Jan 2026 13:20:29 -0800 Vishwanath Seshagiri wrote: > Introduce page_pool support in virtio_net driver to enable page recycling > in RX buffer allocation and avoid repeated page allocator calls. This > applies to mergeable and small buffer modes. > > Beyond performance improvements, this patch is a prerequisite for enabling > memory provider-based zero-copy features in virtio_net, specifically devmem > TCP and io_uring ZCRX, which require drivers to use page_pool for buffer > management.
Struggles to boot in the CI: [ 11.424197][ C0] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN [ 11.424454][ C0] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] [ 11.424606][ C0] CPU: 0 UID: 0 PID: 271 Comm: ip Not tainted 6.19.0-rc6-virtme #1 PREEMPT(full) [ 11.424784][ C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 11.424913][ C0] RIP: 0010:page_pool_alloc_frag_netmem+0x34/0x8e0 [ 11.425054][ C0] Code: b8 00 00 00 00 00 fc ff df 41 57 41 89 c8 41 56 41 55 41 89 d5 48 89 fa 41 54 48 c1 ea 03 49 89 f4 55 53 48 89 fb 48 83 ec 30 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 32 05 00 00 8b 0b 83 f9 3f 0f [ 11.425413][ C0] RSP: 0018:ffa0000000007a00 EFLAGS: 00010286 [ 11.425544][ C0] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000820 [ 11.425697][ C0] RDX: 0000000000000000 RSI: ffa0000000007ac0 RDI: 0000000000000000 [ 11.425846][ C0] RBP: 1ff4000000000f54 R08: 0000000000000820 R09: fff3fc0000000f8f [ 11.426000][ C0] R10: fff3fc0000000f90 R11: 0000000000000001 R12: ffa0000000007ac0 [ 11.426156][ C0] R13: 0000000000000600 R14: ff11000008719d00 R15: ff1100000926de00 [ 11.426308][ C0] FS: 00007f4db5334400(0000) GS:ff110000786fe000(0000) knlGS:0000000000000000 [ 11.426487][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 11.426617][ C0] CR2: 00000000004e5e60 CR3: 000000000b9da001 CR4: 0000000000771ef0 [ 11.426768][ C0] PKRU: 55555554 [ 11.426846][ C0] Call Trace: [ 11.426927][ C0] <IRQ> [ 11.426981][ C0] ? alloc_chain_hlocks+0x1e5/0x5c0 [ 11.427085][ C0] ? buf_to_xdp.isra.0+0x2f0/0x2f0 [ 11.427190][ C0] page_pool_alloc_frag+0xe/0x20 [ 11.427289][ C0] add_recvbuf_mergeable+0x1e0/0x940 [ 11.427392][ C0] ? page_to_skb+0x760/0x760 [ 11.427497][ C0] ? lock_acquire.part.0+0xbc/0x260 [ 11.427597][ C0] ? find_held_lock+0x2b/0x80 [ 11.427696][ C0] try_fill_recv+0x180/0x240 [ 11.427794][ C0] virtnet_poll+0xc79/0x1450 [ 11.427901][ C0] ? receive_buf+0x690/0x690 [ 11.428005][ C0] ? virtnet_xdp_handler+0x900/0x900 [ 11.428109][ C0] ? do_raw_spin_unlock+0x59/0x250 [ 11.428208][ C0] ? rcu_is_watching+0x15/0xd0 [ 11.428310][ C0] __napi_poll.constprop.0+0x97/0x390 [ 11.428415][ C0] net_rx_action+0x4f6/0xed0 [ 11.428517][ C0] ? run_backlog_napi+0x90/0x90 [ 11.428617][ C0] ? sched_balance_domains+0x270/0xd40 [ 11.428721][ C0] ? lockdep_hardirqs_on_prepare.part.0+0x9a/0x160 [ 11.428844][ C0] ? lockdep_hardirqs_on+0x84/0x130 [ 11.428949][ C0] ? sched_balance_update_blocked_averages+0x137/0x1a0 [ 11.429073][ C0] ? mark_held_locks+0x40/0x70 [ 11.429172][ C0] handle_softirqs+0x1d7/0x840 [ 11.429271][ C0] ? _local_bh_enable+0xd0/0xd0 [ 11.429371][ C0] ? __flush_smp_call_function_queue+0x449/0x6d0 [ 11.429497][ C0] ? rcu_is_watching+0x15/0xd0 [ 11.429597][ C0] do_softirq+0xa9/0xe0 https://netdev-ctrl.bots.linux.dev/logs/vmksft/virtio/results/494081/1-basic-features-sh/stderr -- pw-bot: cr
