Re: [PATCH v2] providers/rxe: Set the correct value of resid for inline data

On Sat, Aug 14, 2021 at 6:11 AM Bob Pearson [off-list ref] wrote:

On 8/9/21 10:07 AM, Xiao Yang wrote:

quoted

Resid indicates the residual length of transmitted bytes but current
rxe sets it to zero for inline data at the beginning.  In this case,
request will transmit zero byte to responder wrongly.

Resid should be set to the total length of transmitted bytes at the
beginning.

Note:
Just remove the useless setting of resid in init_send_wqe().

Fixes: 1a894ca10105 ("Providers/rxe: Implement ibv_create_qp_ex verb")
Fixes: 8337db5df125 ("Providers/rxe: Implement memory windows")
Signed-off-by: Xiao Yang <yangx.jy@fujitsu.com>
---
 providers/rxe/rxe.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/providers/rxe/rxe.c b/providers/rxe/rxe.c
index 3c3ea8bb..3533a325 100644
--- a/providers/rxe/rxe.c
+++ b/providers/rxe/rxe.c

@@ -1004,7 +1004,7 @@ static void wr_set_inline_data(struct ibv_qp_ex *ibqp, void *addr,

      memcpy(wqe->dma.inline_data, addr, length);
      wqe->dma.length = length;
-     wqe->dma.resid = 0;
+     wqe->dma.resid = length;
 }

 static void wr_set_inline_data_list(struct ibv_qp_ex *ibqp, size_t num_buf,

@@ -1035,6 +1035,7 @@ static void wr_set_inline_data_list(struct ibv_qp_ex *ibqp, size_t num_buf,
      }

      wqe->dma.length = tot_length;
+     wqe->dma.resid = tot_length;
 }

 static void wr_set_sge(struct ibv_qp_ex *ibqp, uint32_t lkey, uint64_t addr,

@@ -1473,8 +1474,6 @@ static int init_send_wqe(struct rxe_qp *qp, struct rxe_wq *sq,
      if (ibwr->send_flags & IBV_SEND_INLINE) {
              uint8_t *inline_data = wqe->dma.inline_data;

-             wqe->dma.resid = 0;
-
              for (i = 0; i < num_sge; i++) {
                      memcpy(inline_data,
                             (uint8_t *)(long)ibwr->sg_list[i].addr,

Signed-off-by: Bob Pearson <redacted>

The Signed-off-by: tag indicates that the signer was involved in the
development of the patch, or that he/she was in the patch’s delivery
path.

Zhu Yanjun