From: Pavan Nikhilesh Bhagavatula <pbhagavatula@marvell.com>
To: Stephen Hemminger <stephen@networkplumber.org>
Cc: Jerin Jacob <jerinj@marvell.com>,
Shijith Thotton <sthotton@marvell.com>,
"dev@dpdk.org" <dev@dpdk.org>
Subject: RE: [EXTERNAL] Re: [PATCH 07/20] event/cnxk: add CN20K SSO dequeue fast path
Date: Tue, 22 Oct 2024 08:54:25 +0000 [thread overview]
Message-ID: <PH0PR18MB40867AA54DA0F19D7C1907C4DE4C2@PH0PR18MB4086.namprd18.prod.outlook.com> (raw)
In-Reply-To: <20241021184934.402be7ce@hermes.local>
> On Thu, 3 Oct 2024 18:52:24 +0530
> <pbhagavatula@marvell.com> wrote:
>
> > +static __rte_always_inline uint16_t
> > +cn20k_sso_hws_get_work(struct cn20k_sso_hws *ws, struct rte_event
> *ev, const uint32_t flags)
> > +{
> > + union {
> > + __uint128_t get_work;
> > + uint64_t u64[2];
> > + } gw;
> > +
> > + gw.get_work = ws->gw_wdata;
> > +#if defined(RTE_ARCH_ARM64)
> > +#if defined(__clang__)
> > + register uint64_t x0 __asm("x0") = (uint64_t)gw.u64[0];
> > + register uint64_t x1 __asm("x1") = (uint64_t)gw.u64[1];
> > +#if defined(RTE_ARM_USE_WFE)
> > + plt_write64(gw.u64[0], ws->base +
> SSOW_LF_GWS_OP_GET_WORK0);
> > + asm volatile(PLT_CPU_FEATURE_PREAMBLE
> > + " ldp %[x0], %[x1], [%[tag_loc]] \n"
> > + " tbz %[x0], %[pend_gw], done%= \n"
> > + " sevl \n"
> > + "rty%=: wfe \n"
> > + " ldp %[x0], %[x1], [%[tag_loc]] \n"
> > + " tbnz %[x0], %[pend_gw], rty%= \n"
> > + "done%=: \n"
> > + " dmb ld \n"
> > + : [x0] "+r" (x0), [x1] "+r" (x1)
> > + : [tag_loc] "r"(ws->base + SSOW_LF_GWS_WQE0),
> > + [pend_gw]
> "i"(SSOW_LF_GWS_TAG_PEND_GET_WORK_BIT)
> > + : "memory");
> > +#else
> > + asm volatile(".arch armv8-a+lse\n"
> > + "caspal %[x0], %[x1], %[x0], %[x1], [%[dst]]\n"
> > + : [x0] "+r" (x0), [x1] "+r" (x1)
> > + : [dst] "r"(ws->base + SSOW_LF_GWS_OP_GET_WORK0)
> > + : "memory");
> > +#endif
> > + gw.u64[0] = x0;
> > + gw.u64[1] = x1;
> > +#else
> > +#if defined(RTE_ARM_USE_WFE)
> > + plt_write64(gw.u64[0], ws->base +
> SSOW_LF_GWS_OP_GET_WORK0);
> > + asm volatile(PLT_CPU_FEATURE_PREAMBLE
> > + " ldp %[wdata], %H[wdata], [%[tag_loc]] \n"
> > + " tbz %[wdata], %[pend_gw], done%= \n"
> > + " sevl \n"
> > + "rty%=: wfe \n"
> > + " ldp %[wdata], %H[wdata], [%[tag_loc]] \n"
> > + " tbnz %[wdata], %[pend_gw], rty%= \n"
> > + "done%=: \n"
> > + " dmb ld \n"
> > + : [wdata] "=&r"(gw.get_work)
> > + : [tag_loc] "r"(ws->base + SSOW_LF_GWS_WQE0),
> > + [pend_gw]
> "i"(SSOW_LF_GWS_TAG_PEND_GET_WORK_BIT)
> > + : "memory");
> > +#else
> > + asm volatile(PLT_CPU_FEATURE_PREAMBLE
> > + "caspal %[wdata], %H[wdata], %[wdata], %H[wdata],
> [%[gw_loc]]\n"
> > + : [wdata] "+r"(gw.get_work)
> > + : [gw_loc] "r"(ws->base +
> SSOW_LF_GWS_OP_GET_WORK0)
> > + : "memory");
> > +#endif
> > +#endif
>
> This generates lots of warnings like:
>
> WARNING:QUOTED_WHITESPACE_BEFORE_NEWLINE: unnecessary
> whitespace before a quoted newline
> #131: FILE: drivers/event/cnxk/cn20k_worker.h:39:
> + " ldp %[x0], %[x1], [%[tag_loc]] \n"
>
> But the bigger problem is burying assembly in a driver is a bad idea.
> The use of ARM primitives should be done in EAL, not down in the PMD.
This sequence is very specific to the SSO co-processor in CNXK.
I don’t think we can move it to EAL.
>
next prev parent reply other threads:[~2024-10-22 8:54 UTC|newest]
Thread overview: 91+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-03 13:22 [PATCH 01/20] common/cnxk: implement SSO HW info pbhagavatula
2024-10-03 13:22 ` [PATCH 02/20] event/cnxk: add CN20K specific device probe pbhagavatula
2024-10-15 16:17 ` Stephen Hemminger
2024-10-03 13:22 ` [PATCH 03/20] event/cnxk: add CN20K device config pbhagavatula
2024-10-03 13:22 ` [PATCH 04/20] event/cnxk: add CN20k event queue config pbhagavatula
2024-10-03 13:22 ` [PATCH 05/20] event/cnxk: add CN20K event port configuration pbhagavatula
2024-10-03 13:22 ` [PATCH 06/20] event/cnxk: add CN20K SSO enqueue fast path pbhagavatula
2024-10-22 1:46 ` Stephen Hemminger
2024-10-03 13:22 ` [PATCH 07/20] event/cnxk: add CN20K SSO dequeue " pbhagavatula
2024-10-22 1:49 ` Stephen Hemminger
2024-10-22 8:54 ` Pavan Nikhilesh Bhagavatula [this message]
2024-10-03 13:22 ` [PATCH 08/20] event/cnxk: add CN20K event port quiesce pbhagavatula
2024-10-03 13:22 ` [PATCH 09/20] event/cnxk: add CN20K event port profile switch pbhagavatula
2024-10-03 13:22 ` [PATCH 10/20] event/cnxk: add CN20K device start pbhagavatula
2024-10-03 13:22 ` [PATCH 11/20] event/cnxk: add CN20K device stop and close pbhagavatula
2024-10-03 13:22 ` [PATCH 12/20] event/cnxk: add CN20K xstats, selftest and dump pbhagavatula
2024-10-03 13:22 ` [PATCH 13/20] event/cnxk: support CN20K Rx adapter pbhagavatula
2024-10-03 13:22 ` [PATCH 14/20] event/cnxk: support CN20K Rx adapter fast path pbhagavatula
2024-10-03 13:22 ` [PATCH 15/20] event/cnxk: support CN20K Tx adapter pbhagavatula
2024-10-03 13:22 ` [PATCH 16/20] event/cnxk: support CN20K Tx adapter fast path pbhagavatula
2024-10-03 13:22 ` [PATCH 17/20] common/cnxk: add SSO event aggregator pbhagavatula
2024-10-03 13:22 ` [PATCH 18/20] event/cnxk: add Rx/Tx event vector support pbhagavatula
2024-10-03 13:22 ` [PATCH 19/20] common/cnxk: update timer base code pbhagavatula
2024-10-03 13:22 ` [PATCH 20/20] event/cnxk: add CN20K timer adapter pbhagavatula
2024-10-21 20:57 ` [PATCH v2 01/21] common/cnxk: implement SSO HW info pbhagavatula
2024-10-21 20:57 ` [PATCH v2 02/21] event/cnxk: add CN20K specific device probe pbhagavatula
2024-10-21 20:57 ` [PATCH v2 03/21] event/cnxk: add CN20K device config pbhagavatula
2024-10-21 20:57 ` [PATCH v2 04/21] event/cnxk: add CN20k event queue configuration pbhagavatula
2024-10-21 20:57 ` [PATCH v2 05/21] event/cnxk: add CN20K event port configuration pbhagavatula
2024-10-21 20:57 ` [PATCH v2 06/21] event/cnxk: add CN20K SSO enqueue fast path pbhagavatula
2024-10-21 20:57 ` [PATCH v2 07/21] event/cnxk: add CN20K SSO dequeue " pbhagavatula
2024-10-21 20:57 ` [PATCH v2 08/21] event/cnxk: add CN20K event port quiesce pbhagavatula
2024-10-21 20:57 ` [PATCH v2 09/21] event/cnxk: add CN20K event port profile switch pbhagavatula
2024-10-21 20:57 ` [PATCH v2 10/21] event/cnxk: add CN20K event port preschedule pbhagavatula
2024-10-21 20:57 ` [PATCH v2 11/21] event/cnxk: add CN20K device start pbhagavatula
2024-10-21 20:57 ` [PATCH v2 12/21] event/cnxk: add CN20K device stop and close pbhagavatula
2024-10-21 20:57 ` [PATCH v2 13/21] event/cnxk: add CN20K xstats, selftest and dump pbhagavatula
2024-10-21 20:57 ` [PATCH v2 14/21] event/cnxk: support CN20K Rx adapter pbhagavatula
2024-10-21 20:57 ` [PATCH v2 15/21] event/cnxk: support CN20K Rx adapter fast path pbhagavatula
2024-10-21 20:57 ` [PATCH v2 16/21] event/cnxk: support CN20K Tx adapter pbhagavatula
2024-10-21 20:57 ` [PATCH v2 17/21] event/cnxk: support CN20K Tx adapter fast path pbhagavatula
2024-10-21 20:57 ` [PATCH v2 18/21] common/cnxk: add SSO event aggregator pbhagavatula
2024-10-21 20:57 ` [PATCH v2 19/21] event/cnxk: add Rx/Tx event vector support pbhagavatula
2024-10-21 20:57 ` [PATCH v2 20/21] common/cnxk: update timer base code pbhagavatula
2024-10-21 20:57 ` [PATCH v2 21/21] event/cnxk: add CN20K timer adapter pbhagavatula
2024-10-22 8:46 ` [PATCH v3 01/22] event/cnxk: use stdatomic API pbhagavatula
2024-10-22 8:46 ` [PATCH v3 02/22] common/cnxk: implement SSO HW info pbhagavatula
2024-10-22 8:46 ` [PATCH v3 03/22] event/cnxk: add CN20K specific device probe pbhagavatula
2024-10-22 8:46 ` [PATCH v3 04/22] event/cnxk: add CN20K device config pbhagavatula
2024-10-22 8:46 ` [PATCH v3 05/22] event/cnxk: add CN20k event queue configuration pbhagavatula
2024-10-22 8:46 ` [PATCH v3 06/22] event/cnxk: add CN20K event port configuration pbhagavatula
2024-10-22 8:46 ` [PATCH v3 07/22] event/cnxk: add CN20K SSO enqueue fast path pbhagavatula
2024-10-22 8:46 ` [PATCH v3 08/22] event/cnxk: add CN20K SSO dequeue " pbhagavatula
2024-10-22 8:46 ` [PATCH v3 09/22] event/cnxk: add CN20K event port quiesce pbhagavatula
2024-10-22 8:46 ` [PATCH v3 10/22] event/cnxk: add CN20K event port profile switch pbhagavatula
2024-10-22 8:46 ` [PATCH v3 11/22] event/cnxk: add CN20K event port preschedule pbhagavatula
2024-10-22 8:46 ` [PATCH v3 12/22] event/cnxk: add CN20K device start pbhagavatula
2024-10-22 8:46 ` [PATCH v3 13/22] event/cnxk: add CN20K device stop and close pbhagavatula
2024-10-22 8:46 ` [PATCH v3 14/22] event/cnxk: add CN20K xstats, selftest and dump pbhagavatula
2024-10-22 8:46 ` [PATCH v3 15/22] event/cnxk: support CN20K Rx adapter pbhagavatula
2024-10-22 8:46 ` [PATCH v3 16/22] event/cnxk: support CN20K Rx adapter fast path pbhagavatula
2024-10-22 8:46 ` [PATCH v3 17/22] event/cnxk: support CN20K Tx adapter pbhagavatula
2024-10-22 8:46 ` [PATCH v3 18/22] event/cnxk: support CN20K Tx adapter fast path pbhagavatula
2024-10-22 8:46 ` [PATCH v3 19/22] common/cnxk: add SSO event aggregator pbhagavatula
2024-10-22 8:46 ` [PATCH v3 20/22] event/cnxk: add Rx/Tx event vector support pbhagavatula
2024-10-22 8:46 ` [PATCH v3 21/22] common/cnxk: update timer base code pbhagavatula
2024-10-22 8:46 ` [PATCH v3 22/22] event/cnxk: add CN20K timer adapter pbhagavatula
2024-10-22 19:34 ` [PATCH v4 01/22] event/cnxk: use stdatomic API pbhagavatula
2024-10-22 19:34 ` [PATCH v4 02/22] common/cnxk: implement SSO HW info pbhagavatula
2024-10-22 19:34 ` [PATCH v4 03/22] event/cnxk: add CN20K specific device probe pbhagavatula
2024-10-22 19:34 ` [PATCH v4 04/22] event/cnxk: add CN20K device config pbhagavatula
2024-10-22 19:34 ` [PATCH v4 05/22] event/cnxk: add CN20k event queue configuration pbhagavatula
2024-10-22 19:34 ` [PATCH v4 06/22] event/cnxk: add CN20K event port configuration pbhagavatula
2024-10-22 19:34 ` [PATCH v4 07/22] event/cnxk: add CN20K SSO enqueue fast path pbhagavatula
2024-10-22 19:34 ` [PATCH v4 08/22] event/cnxk: add CN20K SSO dequeue " pbhagavatula
2024-10-22 19:34 ` [PATCH v4 09/22] event/cnxk: add CN20K event port quiesce pbhagavatula
2024-10-22 19:34 ` [PATCH v4 10/22] event/cnxk: add CN20K event port profile switch pbhagavatula
2024-10-22 19:34 ` [PATCH v4 11/22] event/cnxk: add CN20K event port preschedule pbhagavatula
2024-10-22 19:34 ` [PATCH v4 12/22] event/cnxk: add CN20K device start pbhagavatula
2024-10-22 19:34 ` [PATCH v4 13/22] event/cnxk: add CN20K device stop and close pbhagavatula
2024-10-22 19:34 ` [PATCH v4 14/22] event/cnxk: add CN20K xstats, selftest and dump pbhagavatula
2024-10-22 19:34 ` [PATCH v4 15/22] event/cnxk: support CN20K Rx adapter pbhagavatula
2024-10-22 19:34 ` [PATCH v4 16/22] event/cnxk: support CN20K Rx adapter fast path pbhagavatula
2024-10-22 19:35 ` [PATCH v4 17/22] event/cnxk: support CN20K Tx adapter pbhagavatula
2024-10-22 19:35 ` [PATCH v4 18/22] event/cnxk: support CN20K Tx adapter fast path pbhagavatula
2024-10-22 19:35 ` [PATCH v4 19/22] common/cnxk: add SSO event aggregator pbhagavatula
2024-10-22 19:35 ` [PATCH v4 20/22] event/cnxk: add Rx/Tx event vector support pbhagavatula
2024-10-22 19:35 ` [PATCH v4 21/22] common/cnxk: update timer base code pbhagavatula
2024-10-22 19:35 ` [PATCH v4 22/22] event/cnxk: add CN20K timer adapter pbhagavatula
2024-10-22 1:52 ` [PATCH 01/20] common/cnxk: implement SSO HW info Stephen Hemminger
2024-10-22 8:53 ` [EXTERNAL] " Pavan Nikhilesh Bhagavatula
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