While running ISER over SIW, the initiator machine encounters a warning from skb_splice_from_iter() indicating that a slab page is being used in send_page. To address this, it is better to add a sendpage_ok() check within the driver itself, and if it returns 0, then MSG_SPLICE_PAGES flag should be disabled before entering the network stack. A similar issue has been discussed for NVMe in this thread: https://lore.kernel.org/all/20240530142417.146696-1-ofir.gal@xxxxxxxxxxx/ stack trace: ... [ 2157.532917] WARNING: CPU: 0 PID: 5342 at net/core/skbuff.c:7140 skb_splice_from_iter+0x173/0x320 Call Trace: [ 2157.533064] Call Trace: [ 2157.533069] ? __warn+0x84/0x130 [ 2157.533073] ? skb_splice_from_iter+0x173/0x320 [ 2157.533075] ? report_bug+0xfc/0x1e0 [ 2157.533081] ? handle_bug+0x3f/0x70 [ 2157.533085] ? exc_invalid_op+0x17/0x70 [ 2157.533088] ? asm_exc_invalid_op+0x1a/0x20 [ 2157.533096] ? skb_splice_from_iter+0x173/0x320 [ 2157.533101] tcp_sendmsg_locked+0x368/0xe40 [ 2157.533111] siw_tx_hdt+0x695/0xa40 [siw] [ 2157.533134] ? sched_balance_find_src_group+0x44/0x4f0 [ 2157.533143] ? __update_load_avg_cfs_rq+0x272/0x300 [ 2157.533152] ? place_entity+0x19/0xf0 [ 2157.533157] ? enqueue_entity+0xdb/0x3d0 [ 2157.533162] ? pick_eevdf+0xe2/0x120 [ 2157.533169] ? check_preempt_wakeup_fair+0x161/0x1f0 [ 2157.533174] ? wakeup_preempt+0x61/0x70 [ 2157.533177] ? ttwu_do_activate+0x5d/0x1e0 [ 2157.533183] ? try_to_wake_up+0x78/0x610 [ 2157.533188] ? xas_load+0xd/0xb0 [ 2157.533193] ? xa_load+0x80/0xb0 [ 2157.533200] siw_qp_sq_process+0x102/0xb00 [siw] [ 2157.533213] ? __pfx_siw_run_sq+0x10/0x10 [siw] [ 2157.533224] siw_sq_resume+0x39/0x110 [siw] [ 2157.533236] siw_run_sq+0x74/0x160 [siw] [ 2157.533246] ? __pfx_autoremove_wake_function+0x10/0x10 [ 2157.533252] kthread+0xd2/0x100 [ 2157.533257] ? __pfx_kthread+0x10/0x10 [ 2157.533261] ret_from_fork+0x34/0x40 [ 2157.533266] ? __pfx_kthread+0x10/0x10 [ 2157.533269] ret_from_fork_asm+0x1a/0x30 . [ 2157.533301] iser: iser_qp_event_callback: qp event QP request error (2) [ 2157.533307] iser: iser_qp_event_callback: qp event send queue drained (5) [ 2157.533348] connection26:0: detected conn error (1011) Signed-off-by: Showrya M N <showrya@xxxxxxxxxxx> Signed-off-by: Potnuri Bharat Teja <bharat@xxxxxxxxxxx> --- V1 -> V2: addressed review comment https://lore.kernel.org/all/BN8PR15MB2513C8CC78CBEADA83117A5599712@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/ --- drivers/infiniband/sw/siw/siw_qp_tx.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/infiniband/sw/siw/siw_qp_tx.c b/drivers/infiniband/sw/siw/siw_qp_tx.c index 64ad9e0895bd..a034264c5669 100644 --- a/drivers/infiniband/sw/siw/siw_qp_tx.c +++ b/drivers/infiniband/sw/siw/siw_qp_tx.c @@ -331,6 +331,8 @@ static int siw_tcp_sendpages(struct socket *s, struct page **page, int offset, msg.msg_flags &= ~MSG_MORE; tcp_rate_check_app_limited(sk); + if (!sendpage_ok(page[i])) + msg.msg_flags &= ~MSG_SPLICE_PAGES; bvec_set_page(&bvec, page[i], bytes, offset); iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, &bvec, 1, size); -- 2.39.1
