From: Yixing Liu liuyixing1@huawei.com
driver inclusion category: bugfix bugzilla: https://gitee.com/src-openeuler/rdma-core/issues/I6VLLM
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Some Kunpeng SoCs do not support the DWQE through NEON instructions. In this case, the IO path works normally, but the performance will deteriorate.
For these SoCs that do not support NEON DWQE, they support DWQE through SVE instructions. This patch supports SVE DWQE to guarantee the performance of these SoCs. In addition, in this scenario, DWQE only supports acceleration through SVE's ldr and str instructions. Other load and store instructions also cause performance degradation.
Signed-off-by: Yixing Liu liuyixing1@huawei.com Reviewed-by: Yangyang Li liyangyang20@huawei.com --- CMakeLists.txt | 1 + buildlib/RDMA_EnableCStd.cmake | 17 +++++++++++++++++ providers/hns/CMakeLists.txt | 5 +++++ providers/hns/hns_roce_u_hw_v2.c | 21 ++++++++++++++++++++- 4 files changed, 43 insertions(+), 1 deletion(-)
diff --git a/CMakeLists.txt b/CMakeLists.txt index 787c8be..bc4437b 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -399,6 +399,7 @@ if (NOT HAVE_SPARSE) endif()
RDMA_Check_SSE(HAVE_TARGET_SSE) +RDMA_Check_SVE(HAVE_TARGET_SVE)
# Enable development support features # Prune unneeded shared libraries during linking diff --git a/buildlib/RDMA_EnableCStd.cmake b/buildlib/RDMA_EnableCStd.cmake index 3c42824..2b56f42 100644 --- a/buildlib/RDMA_EnableCStd.cmake +++ b/buildlib/RDMA_EnableCStd.cmake @@ -127,3 +127,20 @@ int main(int argc, char *argv[]) endif() set(${TO_VAR} "${HAVE_TARGET_SSE}" PARENT_SCOPE) endFunction() + +function(RDMA_Check_SVE TO_VAR) + set(SVE_CHECK_PROGRAM " +int main(int argc, char *argv[]) +{ + return 0; +} +") + + RDMA_Check_C_Compiles(HAVE_TARGET_SVE "${SVE_CHECK_PROGRAM}" "-march=armv8.2-a+sve") + if(NOT HAVE_TARGET_SVE) + message("SVE is not supported") + else() + set(SVE_FLAGS "-march=armv8.2-a+sve" PARENT_SCOPE) + endif() + set(${TO_VAR} "${HAVE_TARGET_SVE}" PARENT_SCOPE) +endFunction() \ No newline at end of file diff --git a/providers/hns/CMakeLists.txt b/providers/hns/CMakeLists.txt index 160e1ff..ef031a8 100644 --- a/providers/hns/CMakeLists.txt +++ b/providers/hns/CMakeLists.txt @@ -11,4 +11,9 @@ publish_headers(infiniband hnsdv.h )
+if (HAVE_TARGET_SVE) + add_definitions("-DHNS_SVE") + set_source_files_properties(hns_roce_u_hw_v2.c PROPERTIES COMPILE_FLAGS "${SVE_FLAGS}") +endif() + rdma_pkg_config("hns" "libibverbs" "${CMAKE_THREAD_LIBS_INIT}") diff --git a/providers/hns/hns_roce_u_hw_v2.c b/providers/hns/hns_roce_u_hw_v2.c index d0067d3..a49b50d 100644 --- a/providers/hns/hns_roce_u_hw_v2.c +++ b/providers/hns/hns_roce_u_hw_v2.c @@ -321,6 +321,22 @@ static void hns_roce_write512(uint64_t *dest, uint64_t *val) mmio_memcpy_x64(dest, val, sizeof(struct hns_roce_rc_sq_wqe)); }
+#if defined(HNS_SVE) +static void hns_roce_sve_write512(uint64_t *dest, uint64_t *val) +{ + asm volatile( + "ldr z0, [%0]\n" + "str z0, [%1]\n" + ::"r" (val), "r"(dest):"cc", "memory" + ); +} +#else +static void hns_roce_sve_write512(uint64_t *dest, uint64_t *val) +{ + return; +} +#endif + static void hns_roce_write_dwqe(struct hns_roce_qp *qp, void *wqe) { struct hns_roce_rc_sq_wqe *rc_sq_wqe = wqe; @@ -337,7 +353,10 @@ static void hns_roce_write_dwqe(struct hns_roce_qp *qp, void *wqe) hr_reg_write(rc_sq_wqe, RCWQE_DB_SL_H, qp->sl >> HNS_ROCE_SL_SHIFT); hr_reg_write(rc_sq_wqe, RCWQE_WQE_IDX, qp->sq.head);
- hns_roce_write512(qp->sq.db_reg, wqe); + if (qp->flags & HNS_ROCE_QP_CAP_SVE_DIRECT_WQE) + hns_roce_sve_write512(qp->sq.db_reg, wqe); + else + hns_roce_write512(qp->sq.db_reg, wqe); }
static void update_cq_db(struct hns_roce_context *ctx, struct hns_roce_cq *cq) -- 2.30.0