From patchwork Sat Dec 23 02:55:40 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Lobakin X-Patchwork-Id: 182885 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a05:7300:2483:b0:fb:cd0c:d3e with SMTP id q3csp1461499dyi; Fri, 22 Dec 2023 19:05:27 -0800 (PST) X-Google-Smtp-Source: AGHT+IEi8gE4qyQ/NQaPNmvwk/QQPRoV4JyhiQtlIEeNgf74U8qx10yqjHVqf3/HNVeihjNCsXsW X-Received: by 2002:a05:6a20:daa6:b0:195:5f5b:5464 with SMTP id iy38-20020a056a20daa600b001955f5b5464mr504942pzb.10.1703300727248; Fri, 22 Dec 2023 19:05:27 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1703300727; cv=none; d=google.com; s=arc-20160816; b=hdFS9t9USzXcfxza9D7RMwEDFB7vb0S8gJZlO00nT+oDHc6Jm8nCPvvPJwKovQ8u7M pfd02bF7+BxNL0dTJXc3Ullha36QlUcVxV9kVocmTU7v+eIFN6/KFwcKy0IRvFPgoJY6 c3HXtDbFYydkqBDu3SIbF7c8XgTYnvkYm244tzYTgcE6aJD5Cd8X8+3oxZaSl9k8VHRr c8nFvLwI5GdT95KjbDAVpcMjj8QL8niVHdIMN1eL79gncxT4UyaJCv3clWF4hDhdknXk fspJgvw7ZaLKnF44MtE89a63R6tgqEMVL/hPBARZNF2rkefU6kTP9HNXjDdf2bO+6f4P 4QKg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:mime-version:list-unsubscribe :list-subscribe:list-id:precedence:references:in-reply-to:message-id :date:subject:cc:to:from:dkim-signature; bh=LT0q30qf9AhYyJBzv9dqYZ2s+JIxwyZtD8WILdKaKm8=; fh=J3H3jkZRTdH/CD0R7uXO8r43FYFiJ1FqB2ouoqeBxmQ=; b=CKAPVlKl7/ZHcb8RDb8n0bjKfKsczkYKb+wnBDHtmlVE/tYILbMNGlMHZqAX7u3OAX GLs9fp5iO0L/ftx0dWdq3kTt2kaI4BbcTwQ5/wHqAc5btl7g0co3oa3h3viPQ4U3nq2M zcBgQVSMGUTJuKQSiJBj9NFQ/pwXjGJ9oVPThi+4vJIaxQt0ZAyh1wNaQ6MHC2YBj7ba Ooeu7KOeF691Q71GnjlrXqzJTjAN9c5wytGO4hA+Ua4WTGgoCDT8V6Nf1lB9/SGOGpjP BV+QZ0+Iz7euLOufv2OLMopUsRNU0ZmN43x46DwGccLKVKw9Dxl1JgqyKLhZSr71a+HM RP4Q== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@intel.com header.s=Intel header.b=G0BxMYx9; spf=pass (google.com: domain of linux-kernel+bounces-10236-ouuuleilei=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) smtp.mailfrom="linux-kernel+bounces-10236-ouuuleilei=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: from sv.mirrors.kernel.org (sv.mirrors.kernel.org. [139.178.88.99]) by mx.google.com with ESMTPS id bi11-20020a056a02024b00b00564c67e66fbsi4433778pgb.842.2023.12.22.19.05.27 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 22 Dec 2023 19:05:27 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel+bounces-10236-ouuuleilei=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) client-ip=139.178.88.99; Authentication-Results: mx.google.com; dkim=pass header.i=@intel.com header.s=Intel header.b=G0BxMYx9; spf=pass (google.com: domain of linux-kernel+bounces-10236-ouuuleilei=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) smtp.mailfrom="linux-kernel+bounces-10236-ouuuleilei=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sv.mirrors.kernel.org (Postfix) with ESMTPS id 043CB285B75 for ; Sat, 23 Dec 2023 03:05:27 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 2A46F33CF7; Sat, 23 Dec 2023 02:59:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="G0BxMYx9" X-Original-To: linux-kernel@vger.kernel.org Received: from mgamail.intel.com (mgamail.intel.com [134.134.136.20]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E018D2F508; Sat, 23 Dec 2023 02:59:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1703300361; x=1734836361; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=9bOZfZie5hng33Moek6x3lg0RS/bldLmOI4f+Of4coI=; b=G0BxMYx9gO1Ay9gxfHySlYiBUH1wNqtgzTWs47uCzw9p+4L4kNhzz+o3 ayWJ7xjtSL7YOoVRyuvjnoUOOmnhco9yxqrdsYpBTUAITb2LAxaz43DWF OYymyifYfJ29wpgW9iGJ1uWJcDWj86JIxghRYtCKEkLcb/WauZCfLoHJk c9zCXfZ3hn+Ho5Wx5IHpomsxk0EZ+fhYs2iusPlcLi42BZCinOUM9GxQ5 pHayul3PuuO4s6PM/+NnCu6cNcl0wRqYTuczbOx8iJF07XTkX5+JjkAKe I0/PsOsxCL//3bqPcn4Ht/dSgeQMB1ATdy6C7eFaEwL2ipve2LAYBf3kU Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10932"; a="386610986" X-IronPort-AV: E=Sophos;i="6.04,298,1695711600"; d="scan'208";a="386610986" Received: from orviesa001.jf.intel.com ([10.64.159.141]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Dec 2023 18:59:21 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.04,298,1695711600"; d="scan'208";a="25537570" Received: from newjersey.igk.intel.com ([10.102.20.203]) by orviesa001.jf.intel.com with ESMTP; 22 Dec 2023 18:59:18 -0800 From: Alexander Lobakin To: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: Alexander Lobakin , Maciej Fijalkowski , Michal Kubiak , Larysa Zaremba , Alexei Starovoitov , Daniel Borkmann , Willem de Bruijn , intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH RFC net-next 20/34] idpf: make complq cleaning dependent on scheduling mode Date: Sat, 23 Dec 2023 03:55:40 +0100 Message-ID: <20231223025554.2316836-21-aleksander.lobakin@intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20231223025554.2316836-1-aleksander.lobakin@intel.com> References: <20231223025554.2316836-1-aleksander.lobakin@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1786040262897288524 X-GMAIL-MSGID: 1786040262897288524 From: Michal Kubiak Extend completion queue cleaning function to support queue-based scheduling mode needed for XDP queues. Add 4-byte descriptor for queue-based scheduling mode and perform some refactoring to extract the common code for both scheduling modes. Make the completion desc parsing function a static inline, as we'll need it in a different file soon. Signed-off-by: Michal Kubiak Signed-off-by: Alexander Lobakin --- .../net/ethernet/intel/idpf/idpf_lan_txrx.h | 6 +- drivers/net/ethernet/intel/idpf/idpf_txrx.c | 203 ++++++++++-------- drivers/net/ethernet/intel/idpf/idpf_txrx.h | 44 ++++ 3 files changed, 166 insertions(+), 87 deletions(-) diff --git a/drivers/net/ethernet/intel/idpf/idpf_lan_txrx.h b/drivers/net/ethernet/intel/idpf/idpf_lan_txrx.h index a5752dcab888..7f8fc9b61e90 100644 --- a/drivers/net/ethernet/intel/idpf/idpf_lan_txrx.h +++ b/drivers/net/ethernet/intel/idpf/idpf_lan_txrx.h @@ -184,13 +184,17 @@ struct idpf_base_tx_desc { __le64 qw1; /* type_cmd_offset_bsz_l2tag1 */ }; /* read used with buffer queues */ -struct idpf_splitq_tx_compl_desc { +struct idpf_splitq_4b_tx_compl_desc { /* qid=[10:0] comptype=[13:11] rsvd=[14] gen=[15] */ __le16 qid_comptype_gen; union { __le16 q_head; /* Queue head */ __le16 compl_tag; /* Completion tag */ } q_head_compl_tag; +}; /* writeback used with completion queues */ + +struct idpf_splitq_tx_compl_desc { + struct idpf_splitq_4b_tx_compl_desc common; u8 ts[3]; u8 rsvd; /* Reserved */ }; /* writeback used with completion queues */ diff --git a/drivers/net/ethernet/intel/idpf/idpf_txrx.c b/drivers/net/ethernet/intel/idpf/idpf_txrx.c index 40b8d8b17827..1a79ec1fb838 100644 --- a/drivers/net/ethernet/intel/idpf/idpf_txrx.c +++ b/drivers/net/ethernet/intel/idpf/idpf_txrx.c @@ -1722,8 +1722,8 @@ static bool idpf_tx_clean_buf_ring(struct idpf_queue *txq, u16 compl_tag, } /** - * idpf_tx_handle_rs_completion - clean a single packet and all of its buffers - * whether on the buffer ring or in the hash table + * idpf_tx_handle_rs_cmpl_qb - clean a single packet and all of its buffers + * whether the Tx queue is working in queue-based scheduling * @txq: Tx ring to clean * @desc: pointer to completion queue descriptor to extract completion * information from @@ -1732,20 +1732,33 @@ static bool idpf_tx_clean_buf_ring(struct idpf_queue *txq, u16 compl_tag, * * Returns bytes/packets cleaned */ -static void idpf_tx_handle_rs_completion(struct idpf_queue *txq, - struct idpf_splitq_tx_compl_desc *desc, - struct idpf_cleaned_stats *cleaned, - int budget) +static void +idpf_tx_handle_rs_cmpl_qb(struct idpf_queue *txq, + const struct idpf_splitq_4b_tx_compl_desc *desc, + struct idpf_cleaned_stats *cleaned, int budget) { - u16 compl_tag; + u16 head = le16_to_cpu(desc->q_head_compl_tag.q_head); - if (!test_bit(__IDPF_Q_FLOW_SCH_EN, txq->flags)) { - u16 head = le16_to_cpu(desc->q_head_compl_tag.q_head); - - return idpf_tx_splitq_clean(txq, head, budget, cleaned, false); - } + return idpf_tx_splitq_clean(txq, head, budget, cleaned, false); +} - compl_tag = le16_to_cpu(desc->q_head_compl_tag.compl_tag); +/** + * idpf_tx_handle_rs_cmpl_fb - clean a single packet and all of its buffers + * whether on the buffer ring or in the hash table (flow-based scheduling only) + * @txq: Tx ring to clean + * @desc: pointer to completion queue descriptor to extract completion + * information from + * @cleaned: pointer to stats struct to track cleaned packets/bytes + * @budget: Used to determine if we are in netpoll + * + * Returns bytes/packets cleaned + */ +static void +idpf_tx_handle_rs_cmpl_fb(struct idpf_queue *txq, + const struct idpf_splitq_4b_tx_compl_desc *desc, + struct idpf_cleaned_stats *cleaned,int budget) +{ + u16 compl_tag = le16_to_cpu(desc->q_head_compl_tag.compl_tag); /* If we didn't clean anything on the ring, this packet must be * in the hash table. Go clean it there. @@ -1754,6 +1767,65 @@ static void idpf_tx_handle_rs_completion(struct idpf_queue *txq, idpf_tx_clean_stashed_bufs(txq, compl_tag, cleaned, budget); } +/** + * idpf_tx_finalize_complq - Finalize completion queue cleaning + * @complq: completion queue to finalize + * @ntc: next to complete index + * @gen_flag: current state of generation flag + * @cleaned: returns number of packets cleaned + */ +static void idpf_tx_finalize_complq(struct idpf_queue *complq, int ntc, + bool gen_flag, int *cleaned) +{ + struct idpf_netdev_priv *np; + bool complq_ok = true; + int i; + + /* Store the state of the complq to be used later in deciding if a + * TXQ can be started again + */ + if (unlikely(IDPF_TX_COMPLQ_PENDING(complq->txq_grp) > + IDPF_TX_COMPLQ_OVERFLOW_THRESH(complq))) + complq_ok = false; + + np = netdev_priv(complq->vport->netdev); + for (i = 0; i < complq->txq_grp->num_txq; ++i) { + struct idpf_queue *tx_q = complq->txq_grp->txqs[i]; + struct netdev_queue *nq; + bool dont_wake; + + /* We didn't clean anything on this queue, move along */ + if (!tx_q->cleaned_bytes) + continue; + + *cleaned += tx_q->cleaned_pkts; + + /* Update BQL */ + nq = netdev_get_tx_queue(tx_q->vport->netdev, tx_q->idx); + + dont_wake = !complq_ok || IDPF_TX_BUF_RSV_LOW(tx_q) || + np->state != __IDPF_VPORT_UP || + !netif_carrier_ok(tx_q->vport->netdev); + /* Check if the TXQ needs to and can be restarted */ + __netif_txq_completed_wake(nq, tx_q->cleaned_pkts, tx_q->cleaned_bytes, + IDPF_DESC_UNUSED(tx_q), IDPF_TX_WAKE_THRESH, + dont_wake); + + /* Reset cleaned stats for the next time this queue is + * cleaned + */ + tx_q->cleaned_bytes = 0; + tx_q->cleaned_pkts = 0; + } + + ntc += complq->desc_count; + complq->next_to_clean = ntc; + if (gen_flag) + set_bit(__IDPF_Q_GEN_CHK, complq->flags); + else + clear_bit(__IDPF_Q_GEN_CHK, complq->flags); +} + /** * idpf_tx_clean_complq - Reclaim resources on completion queue * @complq: Tx ring to clean @@ -1765,61 +1837,55 @@ static void idpf_tx_handle_rs_completion(struct idpf_queue *txq, static bool idpf_tx_clean_complq(struct idpf_queue *complq, int budget, int *cleaned) { - struct idpf_splitq_tx_compl_desc *tx_desc; + struct idpf_splitq_4b_tx_compl_desc *tx_desc; struct idpf_vport *vport = complq->vport; s16 ntc = complq->next_to_clean; - struct idpf_netdev_priv *np; unsigned int complq_budget; - bool complq_ok = true; - int i; + bool flow, gen_flag; + u32 pos = ntc; + + flow = test_bit(__IDPF_Q_FLOW_SCH_EN, complq->flags); + gen_flag = test_bit(__IDPF_Q_GEN_CHK, complq->flags); complq_budget = vport->compln_clean_budget; - tx_desc = &complq->comp[ntc]; + tx_desc = flow ? &complq->comp[pos].common : &complq->comp_4b[pos]; ntc -= complq->desc_count; do { struct idpf_cleaned_stats cleaned_stats = { }; struct idpf_queue *tx_q; - int rel_tx_qid; u16 hw_head; - u8 ctype; /* completion type */ - u16 gen; - - /* if the descriptor isn't done, no work yet to do */ - gen = (le16_to_cpu(tx_desc->qid_comptype_gen) & - IDPF_TXD_COMPLQ_GEN_M) >> IDPF_TXD_COMPLQ_GEN_S; - if (test_bit(__IDPF_Q_GEN_CHK, complq->flags) != gen) - break; - - /* Find necessary info of TX queue to clean buffers */ - rel_tx_qid = (le16_to_cpu(tx_desc->qid_comptype_gen) & - IDPF_TXD_COMPLQ_QID_M) >> IDPF_TXD_COMPLQ_QID_S; - if (rel_tx_qid >= complq->txq_grp->num_txq || - !complq->txq_grp->txqs[rel_tx_qid]) { - dev_err(&complq->vport->adapter->pdev->dev, - "TxQ not found\n"); - goto fetch_next_desc; - } - tx_q = complq->txq_grp->txqs[rel_tx_qid]; + int ctype; - /* Determine completion type */ - ctype = (le16_to_cpu(tx_desc->qid_comptype_gen) & - IDPF_TXD_COMPLQ_COMPL_TYPE_M) >> - IDPF_TXD_COMPLQ_COMPL_TYPE_S; + ctype = idpf_parse_compl_desc(tx_desc, complq, &tx_q, + gen_flag); switch (ctype) { case IDPF_TXD_COMPLT_RE: + if (unlikely(!flow)) + goto fetch_next_desc; + hw_head = le16_to_cpu(tx_desc->q_head_compl_tag.q_head); idpf_tx_splitq_clean(tx_q, hw_head, budget, &cleaned_stats, true); break; case IDPF_TXD_COMPLT_RS: - idpf_tx_handle_rs_completion(tx_q, tx_desc, - &cleaned_stats, budget); + if (flow) + idpf_tx_handle_rs_cmpl_fb(tx_q, tx_desc, + &cleaned_stats, + budget); + else + idpf_tx_handle_rs_cmpl_qb(tx_q, tx_desc, + &cleaned_stats, + budget); break; case IDPF_TXD_COMPLT_SW_MARKER: idpf_tx_handle_sw_marker(tx_q); break; + case -ENODATA: + goto exit_clean_complq; + case -EINVAL: + goto fetch_next_desc; default: dev_err(&tx_q->vport->adapter->pdev->dev, "Unknown TX completion type: %d\n", @@ -1836,59 +1902,24 @@ static bool idpf_tx_clean_complq(struct idpf_queue *complq, int budget, u64_stats_update_end(&tx_q->stats_sync); fetch_next_desc: - tx_desc++; + pos++; ntc++; if (unlikely(!ntc)) { ntc -= complq->desc_count; - tx_desc = &complq->comp[0]; - change_bit(__IDPF_Q_GEN_CHK, complq->flags); + pos = 0; + gen_flag = !gen_flag; } + tx_desc = flow ? &complq->comp[pos].common : + &complq->comp_4b[pos]; prefetch(tx_desc); /* update budget accounting */ complq_budget--; } while (likely(complq_budget)); - /* Store the state of the complq to be used later in deciding if a - * TXQ can be started again - */ - if (unlikely(IDPF_TX_COMPLQ_PENDING(complq->txq_grp) > - IDPF_TX_COMPLQ_OVERFLOW_THRESH(complq))) - complq_ok = false; - - np = netdev_priv(complq->vport->netdev); - for (i = 0; i < complq->txq_grp->num_txq; ++i) { - struct idpf_queue *tx_q = complq->txq_grp->txqs[i]; - struct netdev_queue *nq; - bool dont_wake; - - /* We didn't clean anything on this queue, move along */ - if (!tx_q->cleaned_bytes) - continue; - - *cleaned += tx_q->cleaned_pkts; - - /* Update BQL */ - nq = netdev_get_tx_queue(tx_q->vport->netdev, tx_q->idx); - - dont_wake = !complq_ok || IDPF_TX_BUF_RSV_LOW(tx_q) || - np->state != __IDPF_VPORT_UP || - !netif_carrier_ok(tx_q->vport->netdev); - /* Check if the TXQ needs to and can be restarted */ - __netif_txq_completed_wake(nq, tx_q->cleaned_pkts, tx_q->cleaned_bytes, - IDPF_DESC_UNUSED(tx_q), IDPF_TX_WAKE_THRESH, - dont_wake); - - /* Reset cleaned stats for the next time this queue is - * cleaned - */ - tx_q->cleaned_bytes = 0; - tx_q->cleaned_pkts = 0; - } - - ntc += complq->desc_count; - complq->next_to_clean = ntc; +exit_clean_complq: + idpf_tx_finalize_complq(complq, ntc, gen_flag, cleaned); return !!complq_budget; } diff --git a/drivers/net/ethernet/intel/idpf/idpf_txrx.h b/drivers/net/ethernet/intel/idpf/idpf_txrx.h index 2584bd94363f..3e15ed779860 100644 --- a/drivers/net/ethernet/intel/idpf/idpf_txrx.h +++ b/drivers/net/ethernet/intel/idpf/idpf_txrx.h @@ -577,6 +577,7 @@ struct idpf_queue { struct idpf_flex_tx_ctx_desc *flex_ctx; struct idpf_splitq_tx_compl_desc *comp; + struct idpf_splitq_4b_tx_compl_desc *comp_4b; void *desc_ring; }; @@ -821,6 +822,49 @@ static inline void idpf_tx_splitq_build_desc(union idpf_tx_flex_desc *desc, idpf_tx_splitq_build_flow_desc(desc, params, td_cmd, size); } +/** + * idpf_parse_compl_desc - Parse the completion descriptor + * @desc: completion descriptor to be parsed + * @complq: completion queue containing the descriptor + * @txq: returns corresponding Tx queue for a given descriptor + * @gen_flag: current generation flag in the completion queue + * + * Returns completion type from descriptor or negative value in case of error: + * -ENODATA if there is no completion descriptor to be cleaned + * -EINVAL if no Tx queue has been found for the completion queue + */ +static inline int +idpf_parse_compl_desc(struct idpf_splitq_4b_tx_compl_desc *desc, + struct idpf_queue *complq, struct idpf_queue **txq, + bool gen_flag) +{ + int rel_tx_qid; + u8 ctype; /* completion type */ + u16 gen; + + /* if the descriptor isn't done, no work yet to do */ + gen = (le16_to_cpu(desc->qid_comptype_gen) & + IDPF_TXD_COMPLQ_GEN_M) >> IDPF_TXD_COMPLQ_GEN_S; + if (gen_flag != gen) + return -ENODATA; + + /* Find necessary info of TX queue to clean buffers */ + rel_tx_qid = (le16_to_cpu(desc->qid_comptype_gen) & + IDPF_TXD_COMPLQ_QID_M) >> IDPF_TXD_COMPLQ_QID_S; + if (rel_tx_qid >= complq->txq_grp->num_txq || + !complq->txq_grp->txqs[rel_tx_qid]) + return -EINVAL; + + *txq = complq->txq_grp->txqs[rel_tx_qid]; + + /* Determine completion type */ + ctype = (le16_to_cpu(desc->qid_comptype_gen) & + IDPF_TXD_COMPLQ_COMPL_TYPE_M) >> + IDPF_TXD_COMPLQ_COMPL_TYPE_S; + + return ctype; +} + /** * idpf_vport_intr_set_wb_on_itr - enable descriptor writeback on disabled interrupts * @q_vector: pointer to queue vector struct