[PATCH 4.14 107/222] IB/rxe: fix for duplicate request processing and ack psns

Greg Kroah-Hartman
2018-11-11T22:32:52Z

From: Vijay Immanuel <vijayi@attalasystems.com>

[ Upstream commit b97db58557f4aa6d9903f8e1deea6b3d1ed0ba43 ]

Don't reset the resp opcode for a replayed read response.
The resp opcode could be in the middle of a write or send
sequence, when the duplicate read request was received.
An example sequence is as follows:
- Receive read request for 12KB PSN 20. Transmit read response
first, middle and last with PSNs 20,21,22.
- Receive write first PSN 23.
At this point the resp psn is 24 and resp opcode is write first.
- The sender notices that PSN 20 is dropped and retransmits.
Receive read request for 12KB PSN 20. Transmit read response
first, middle and last with PSNs 20,21,22. The resp opcode is
set to -1, the resp psn remains 24.
- Receive write first PSN 23. This is processed by duplicate_request().
The resp opcode remains -1 and resp psn remains 24.
- Receive write middle PSN 24. check_op_seq() reports a missing
first error since the resp opcode is -1.

When sending an ack for a duplicate send or write request,
use the psn of the previous ack sent. Do not use the psn
of a read response for the ack.
An example sequence is as follows:
- Receive write PSN 30. Transmit ACK for PSN 30.
- Receive read request 4KB PSN 31. Transmit read response with
PSN 31. The resp psn is now 32.
- The sender notices that PSN 30 is dropped and retransmits.
Receive write PSN 30. duplicate_request() sends an ACK with
PSN 31. That is incorrect since PSN 31 was a read request.

Signed-off-by: Vijay Immanuel <vijayi@attalasystems.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/infiniband/sw/rxe/rxe_resp.c | 8 ++++++--
drivers/infiniband/sw/rxe/rxe_verbs.h | 2 ++
2 files changed, 8 insertions(+), 2 deletions(-)

--- a/drivers/infiniband/sw/rxe/rxe_resp.c
+++ b/drivers/infiniband/sw/rxe/rxe_resp.c
@@ -683,6 +683,7 @@ static enum resp_states read_reply(struc
rxe_advance_resp_resource(qp);

res->type = RXE_READ_MASK;
+ res->replay = 0;

res->read.va = qp->resp.va;
res->read.va_org = qp->resp.va;
@@ -753,7 +754,8 @@ static enum resp_states read_reply(struc
state = RESPST_DONE;
} else {
qp->resp.res = NULL;
- qp->resp.opcode = -1;
+ if (!res->replay)
+ qp->resp.opcode = -1;
if (psn_compare(res->cur_psn, qp->resp.psn) >= 0)
qp->resp.psn = res->cur_psn;
state = RESPST_CLEANUP;
@@ -815,6 +817,7 @@ static enum resp_states execute(struct r

/* next expected psn, read handles this separately */
qp->resp.psn = (pkt->psn + 1) & BTH_PSN_MASK;
+ qp->resp.ack_psn = qp->resp.psn;

qp->resp.opcode = pkt->opcode;
qp->resp.status = IB_WC_SUCCESS;
@@ -1071,7 +1074,7 @@ static enum resp_states duplicate_reques
struct rxe_pkt_info *pkt)
{
enum resp_states rc;
- u32 prev_psn = (qp->resp.psn - 1) & BTH_PSN_MASK;
+ u32 prev_psn = (qp->resp.ack_psn - 1) & BTH_PSN_MASK;

if (pkt->mask & RXE_SEND_MASK ||
pkt->mask & RXE_WRITE_MASK) {
@@ -1114,6 +1117,7 @@ static enum resp_states duplicate_reques
res->state = (pkt->psn == res->first_psn) ?
rdatm_res_state_new :
rdatm_res_state_replay;
+ res->replay = 1;

/* Reset the resource, except length. */
res->read.va_org = iova;
--- a/drivers/infiniband/sw/rxe/rxe_verbs.h
+++ b/drivers/infiniband/sw/rxe/rxe_verbs.h
@@ -173,6 +173,7 @@ enum rdatm_res_state {

struct resp_res {
int type;
+ int replay;
u32 first_psn;
u32 last_psn;
u32 cur_psn;
@@ -197,6 +198,7 @@ struct rxe_resp_info {
enum rxe_qp_state state;
u32 msn;
u32 psn;
+ u32 ack_psn;
int opcode;
int drop_msg;
int goto_error;