Misc changes for siw

V3 changes:
1. collect tags from Bernard, thanks!
2. add comment back to the last patch.

V2 changes:
1. add Fixes lines for the first two patches per Leon

Hi,

The first one fix below calltrace which could happen if siw_connect goto error (I manually set rv to -1 after siw_send_mpareqrep to trigger it) after cep is allocated.

[   97.341035] ------------[ cut here ]------------
[   97.341037] WARNING: CPU: 0 PID: 143 at drivers/infiniband/sw/siw/siw_cm.c:444 siw_cep_put+0x1c5/0x1e0 [siw]
...
[   97.341126] CPU: 0 PID: 143 Comm: kworker/u4:4 Tainted: G           OE      6.5.0-rc3+ #16
[   97.341128] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.0-0-gd239552c-rebuilt.opensuse.org 04/01/2014
[   97.341130] Workqueue: rdma_cm cma_work_handler [rdma_cm]
[   97.341137] RIP: 0010:siw_cep_put+0x1c5/0x1e0 [siw]
...
[   97.341159] Call Trace:
[   97.341160]  <TASK>
[   97.341162]  ? show_regs+0x72/0x90
[   97.341166]  ? siw_cep_put+0x1c5/0x1e0 [siw]
[   97.341170]  ? __warn+0x8d/0x1a0
[   97.341175]  ? siw_cep_put+0x1c5/0x1e0 [siw]
[   97.341180]  ? report_bug+0x1f9/0x250
[   97.341185]  ? handle_bug+0x46/0x90
[   97.341188]  ? exc_invalid_op+0x19/0x80
[   97.341190]  ? asm_exc_invalid_op+0x1b/0x20
[   97.341196]  ? siw_cep_put+0x1c5/0x1e0 [siw]
[   97.341204]  siw_connect+0x474/0x780 [siw]
[   97.341211]  iw_cm_connect+0x1ca/0x250 [iw_cm]
[   97.341216]  rdma_connect_locked+0x1bf/0x940 [rdma_cm]
[   97.341227]  nvme_rdma_cm_handler+0x5d7/0x9c0 [nvme_rdma]
[   97.341235]  cma_cm_event_handler+0x4f/0x170 [rdma_cm]
[   97.341241]  cma_work_handler+0x6a/0xe0 [rdma_cm]
[   97.341247]  process_one_work+0x2bd/0x590

...

The second one make the debug message consistent with the condition, and the last one cleanup code a bit. Pls help to review them.

Thanks,
Guoqing

Guoqing Jiang (3):
RDMA/siw: Balance the reference of cep->kref in the error path RDMA/siw: Correct wrong debug message
RDMA/siw: Call llist_reverse_order in siw_run_sq

 drivers/infiniband/sw/siw/siw_cm.c    | 1 -
 drivers/infiniband/sw/siw/siw_qp_tx.c | 8 +-------
 drivers/infiniband/sw/siw/siw_verbs.c | 2 +-
 3 files changed, 2 insertions(+), 9 deletions(-)

2.35.3

The siw_connect can go to err in below after cep is allocated successfully:

1. If siw_cm_alloc_work returns failure. In this case socket is not assoicated with cep so siw_cep_put can't be called by siw_socket_disassoc. We need to call siw_cep_put twice since cep->kref is increased once after it was initialized.

2. If siw_cm_queue_work can't find a work, which means siw_cep_get is not called in siw_cm_queue_work, so cep->kref is increased twice by siw_cep_get and when associate socket with cep after it was initialized. So we need to call siw_cep_put three times (one in siw_socket_disassoc).

3. siw_send_mpareqrep returns error, this scenario is similar as 2.

So we need to remove one siw_cep_put in the error path.

---
 drivers/infiniband/sw/siw/siw_cm.c | 1 -
 1 file changed, 1 deletion(-)

index da530c0404da..a2605178f4ed 100644
@@ -1501,7 +1501,6 @@ int siw_connect(struct iw_cm_id *id, struct iw_cm_conn_param *params)
 
 		cep->cm_id = NULL;
 		id->rem_ref(id);
-		siw_cep_put(cep);
 
 		qp->cep = NULL;
 		siw_cep_put(cep);

2.35.3

We need to print num_sle first then pbl->max_buf per the condition. Also replace mem->pbl with pbl while at it.

---
 drivers/infiniband/sw/siw/siw_verbs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index fadfa70853f3..fdbef3254e30 100644
@@ -1494,7 +1494,7 @@ int siw_map_mr_sg(struct ib_mr *base_mr, struct scatterlist *sl, int num_sle,
 
 	if (pbl->max_buf < num_sle) {
 		siw_dbg_mem(mem, "too many SGE's: %d > %d\n",
-			    mem->pbl->max_buf, num_sle);
+			    num_sle, pbl->max_buf);
 		return -ENOMEM;
 	}
 	for_each_sg(sl, slp, num_sle, i) {

2.35.3

We can call the function to get fifo list.

---
 drivers/infiniband/sw/siw/siw_qp_tx.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

index 3ff339eceec3..60b6a4135961 100644
@@ -1271,13 +1271,7 @@ int siw_run_sq(void *data)
 		 * llist_del_all returns a list with newest entry first.
 		 * Re-order list for fairness among QP's.
 		 */
-		while (active) {
-			struct llist_node *tmp = active;
-
-			active = llist_next(active);
-			tmp->next = fifo_list;
-			fifo_list = tmp;
-		}
+		fifo_list = llist_reverse_order(active);
 		while (fifo_list) {
 			qp = container_of(fifo_list, struct siw_qp, tx_list);
 			fifo_list = llist_next(fifo_list);

2.35.3

Applied, thanks!

[1/3] RDMA/siw: Balance the reference of cep->kref in the error path

      https://git.kernel.org/rdma/rdma/c/b056327bee09e6
[2/3] RDMA/siw: Correct wrong debug message
      https://git.kernel.org/rdma/rdma/c/bee024d20451e4
[3/3] RDMA/siw: Call llist_reverse_order in siw_run_sq
      https://git.kernel.org/rdma/rdma/c/9dfccb6d0d3d13

Best regards,

Leon Romanovsky <[email protected]>