diff options
| author | Bharat Potnuri <bharat@chelsio.com> | 2017-11-28 21:28:07 +0300 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@mellanox.com> | 2017-12-19 02:12:18 +0300 |
| commit | 66f53e6f5400578bae58db0c06d85a8820831f40 (patch) | |
| tree | c57455cec5216731c592197f589b031c5c62baa0 /drivers | |
| parent | 16c72e402867e956fd558d55cbe2f1a40c742e73 (diff) | |
| download | linux-66f53e6f5400578bae58db0c06d85a8820831f40.tar.xz | |
iser-target: avoid reinitializing rdma contexts for isert commands
isert commands that failed during isert_rdma_rw_ctx_post() are queued to
Queue-Full(QF) queue and are scheduled to be reposted during queue-full
queue processing. During this reposting, the rdma contexts are initialised
again in isert_rdma_rw_ctx_post(), which is leaking significant memory.
unreferenced object 0xffff8830201d9640 (size 64):
comm "kworker/0:2", pid 195, jiffies 4295374851 (age 4528.436s)
hex dump (first 32 bytes):
00 60 8b cb 2e 00 00 00 00 10 00 00 00 00 00 00 .`..............
00 90 e3 cb 2e 00 00 00 00 10 00 00 00 00 00 00 ................
backtrace:
[<ffffffff8170711e>] kmemleak_alloc+0x4e/0xb0
[<ffffffff811f8ba5>] __kmalloc+0x125/0x2b0
[<ffffffffa046b24f>] rdma_rw_ctx_init+0x15f/0x6f0 [ib_core]
[<ffffffffa07ab644>] isert_rdma_rw_ctx_post+0xc4/0x3c0 [ib_isert]
[<ffffffffa07ad972>] isert_put_datain+0x112/0x1c0 [ib_isert]
[<ffffffffa07dddce>] lio_queue_data_in+0x2e/0x30 [iscsi_target_mod]
[<ffffffffa076c322>] target_qf_do_work+0x2b2/0x4b0 [target_core_mod]
[<ffffffff81080c3b>] process_one_work+0x1db/0x5d0
[<ffffffff8108107d>] worker_thread+0x4d/0x3e0
[<ffffffff81088667>] kthread+0x117/0x150
[<ffffffff81713fa7>] ret_from_fork+0x27/0x40
[<ffffffffffffffff>] 0xffffffffffffffff
Here is patch to use the older rdma contexts while reposting
the isert commands intead of reinitialising them.
Signed-off-by: Potnuri Bharat Teja <bharat@chelsio.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/infiniband/ulp/isert/ib_isert.c | 7 | ||||
| -rw-r--r-- | drivers/infiniband/ulp/isert/ib_isert.h | 1 |
2 files changed, 8 insertions, 0 deletions
diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c index 720dfb3a1ac2..fd55163801a3 100644 --- a/drivers/infiniband/ulp/isert/ib_isert.c +++ b/drivers/infiniband/ulp/isert/ib_isert.c @@ -2123,6 +2123,9 @@ isert_rdma_rw_ctx_post(struct isert_cmd *cmd, struct isert_conn *conn, u32 rkey, offset; int ret; + if (cmd->ctx_init_done) + goto rdma_ctx_post; + if (dir == DMA_FROM_DEVICE) { addr = cmd->write_va; rkey = cmd->write_stag; @@ -2150,11 +2153,15 @@ isert_rdma_rw_ctx_post(struct isert_cmd *cmd, struct isert_conn *conn, se_cmd->t_data_sg, se_cmd->t_data_nents, offset, addr, rkey, dir); } + if (ret < 0) { isert_err("Cmd: %p failed to prepare RDMA res\n", cmd); return ret; } + cmd->ctx_init_done = true; + +rdma_ctx_post: ret = rdma_rw_ctx_post(&cmd->rw, conn->qp, port_num, cqe, chain_wr); if (ret < 0) isert_err("Cmd: %p failed to post RDMA res\n", cmd); diff --git a/drivers/infiniband/ulp/isert/ib_isert.h b/drivers/infiniband/ulp/isert/ib_isert.h index d6fd248320ae..3b296bac4f60 100644 --- a/drivers/infiniband/ulp/isert/ib_isert.h +++ b/drivers/infiniband/ulp/isert/ib_isert.h @@ -126,6 +126,7 @@ struct isert_cmd { struct rdma_rw_ctx rw; struct work_struct comp_work; struct scatterlist sg; + bool ctx_init_done; }; static inline struct isert_cmd *tx_desc_to_cmd(struct iser_tx_desc *desc) |