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When skb is sent, it will pass the following functions in soft roce.
rxe_send [rdma_rxe]
ip_local_out
__ip_local_out
ip_output
ip_finish_output
ip_finish_output2
dev_queue_xmit
__dev_queue_xmit
dev_hard_start_xmit
In the above functions, if error occurs in the above functions or
iptables rules drop skb after ip_local_out, kfree_skb will be called.
So it is not necessary to call kfree_skb in soft roce module again.
Or else crash will occur.
The steps to reproduce:
server client
--------- ---------
|1.1.1.1|<----rxe-channel--->|1.1.1.2|
--------- ---------
On server: rping -s -a 1.1.1.1 -v -C 10000 -S 512
On client: rping -c -a 1.1.1.1 -v -C 10000 -S 512
The kernel configs CONFIG_DEBUG_KMEMLEAK and
CONFIG_DEBUG_OBJECTS are enabled on both server and client.
When rping runs, run the following command in server:
iptables -I OUTPUT -p udp --dport 4791 -j DROP
Without this patch, crash will occur.
CC: Srinivas Eeda <srinivas.eeda@oracle.com>
CC: Junxiao Bi <junxiao.bi@oracle.com>
Signed-off-by: Zhu Yanjun <yanjun.zhu@oracle.com>
Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
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|---|---|---|
| .. | ||
| Kconfig | ||
| Makefile | ||
| rxe_av.c | ||
| rxe_comp.c | ||
| rxe_cq.c | ||
| rxe_hdr.h | ||
| rxe_hw_counters.c | ||
| rxe_hw_counters.h | ||
| rxe_icrc.c | ||
| rxe_loc.h | ||
| rxe_mcast.c | ||
| rxe_mmap.c | ||
| rxe_mr.c | ||
| rxe_net.c | ||
| rxe_net.h | ||
| rxe_opcode.c | ||
| rxe_opcode.h | ||
| rxe_param.h | ||
| rxe_pool.c | ||
| rxe_pool.h | ||
| rxe_qp.c | ||
| rxe_queue.c | ||
| rxe_queue.h | ||
| rxe_recv.c | ||
| rxe_req.c | ||
| rxe_resp.c | ||
| rxe_srq.c | ||
| rxe_sysfs.c | ||
| rxe_task.c | ||
| rxe_task.h | ||
| rxe_verbs.c | ||
| rxe_verbs.h | ||
| rxe.c | ||
| rxe.h | ||