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authorJack Morgenstein <jackm@dev.mellanox.co.il>2018-08-27 08:35:55 +0300
committerJason Gunthorpe <jgg@mellanox.com>2018-09-06 00:38:09 +0300
commitf794809a7259dfaa3d47d90ef5a86007cf48b1ce (patch)
treee60d97572657a22d91acc46b04889c21f54d2789 /include/rdma
parent08920b8f5d2d3b6eb8bc118923f707c769704c77 (diff)
downloadlinux-f794809a7259dfaa3d47d90ef5a86007cf48b1ce.tar.xz
IB/core: Add an unbound WQ type to the new CQ API
The upstream kernel commit cited below modified the workqueue in the new CQ API to be bound to a specific CPU (instead of being unbound). This caused ALL users of the new CQ API to use the same bound WQ. Specifically, MAD handling was severely delayed when the CPU bound to the WQ was busy handling (higher priority) interrupts. This caused a delay in the MAD "heartbeat" response handling, which resulted in ports being incorrectly classified as "down". To fix this, add a new "unbound" WQ type to the new CQ API, so that users have the option to choose either a bound WQ or an unbound WQ. For MADs, choose the new "unbound" WQ. Fixes: b7363e67b23e ("IB/device: Convert ib-comp-wq to be CPU-bound") Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Reviewed-by: Sagi Grimberg <sagi@grimberg.m> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'include/rdma')
-rw-r--r--include/rdma/ib_verbs.h9
1 files changed, 6 insertions, 3 deletions
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index e950c2a68f06..df8d234a2b56 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -71,6 +71,7 @@
extern struct workqueue_struct *ib_wq;
extern struct workqueue_struct *ib_comp_wq;
+extern struct workqueue_struct *ib_comp_unbound_wq;
union ib_gid {
u8 raw[16];
@@ -1570,9 +1571,10 @@ struct ib_ah {
typedef void (*ib_comp_handler)(struct ib_cq *cq, void *cq_context);
enum ib_poll_context {
- IB_POLL_DIRECT, /* caller context, no hw completions */
- IB_POLL_SOFTIRQ, /* poll from softirq context */
- IB_POLL_WORKQUEUE, /* poll from workqueue */
+ IB_POLL_DIRECT, /* caller context, no hw completions */
+ IB_POLL_SOFTIRQ, /* poll from softirq context */
+ IB_POLL_WORKQUEUE, /* poll from workqueue */
+ IB_POLL_UNBOUND_WORKQUEUE, /* poll from unbound workqueue */
};
struct ib_cq {
@@ -1589,6 +1591,7 @@ struct ib_cq {
struct irq_poll iop;
struct work_struct work;
};
+ struct workqueue_struct *comp_wq;
/*
* Implementation details of the RDMA core, don't use in drivers:
*/