From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f45.google.com (mail-wm0-f45.google.com [74.125.82.45]) by dpdk.org (Postfix) with ESMTP id 12EAEADE9 for ; Wed, 8 Jun 2016 11:48:41 +0200 (CEST) Received: by mail-wm0-f45.google.com with SMTP id n184so173201711wmn.1 for ; Wed, 08 Jun 2016 02:48:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=6wind-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=Ulxd6MOlSGFazvjX/F7MTfmnZ0jTDZGEfWAYZhIz+x0=; b=X0kgFlFBAWL0jk3h2KDpWbcVG/rJLNjL+R9xkhjPQ2egGYLvOMaQ1JJPPP/FO6vK4G k3ExC3tbyylo5lcd7bAvxnJ+idXAZb9hQoMaVJTBYE8vytN77yMMJLHzTXBJhSWzz95o EWZxLfqcQtJsuoAgIes/yKocd9MW5B0XyvutjnoZAdTZNx6UkxppfMZC8KdQz9jNutKA 7/d2GCPX8sxcvWJqutKAV25lImZuX6xuxbZxjvOLuwDFk0zAhhHwDvzadfjMCcGonYbi 1coIfM7LNMhuhw7nBj/N5OcyKwqMv0PblxlPdUZvQHeo4a28qR3vShxLMZ6ZRxqxoll1 ar0w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=Ulxd6MOlSGFazvjX/F7MTfmnZ0jTDZGEfWAYZhIz+x0=; b=GuYGeNDjxOKnFLp+lj9jCwgUGwXFkkOG3GAn4QHw0P63T8k5U0uVW6JyqQmBmHlJPc QJNYI7BZq7JG2sUSx69UxDA36+FAhcqEttesLu1d1eOWTnQqDkQkKOcCajePfaoTD2Zf CoPpf/G7+rJXeka5fHjuI50/Mdnr94tE2Z781hClNlriJ763f2gpbjC9c65bfFfcTtnD zzor6k65plKPAzrI/nubHW2pARwhjSP8pvjHs/9d4EKz2Ytgt+DogVFoMaa7t8/maVxt vV/Awe99vU0I9bkAOYNqQaWu29H4MMYiCzFvaf5XOEe8CpP6rOASIWyYGCuzUbBLmirx JquA== X-Gm-Message-State: ALyK8tLZmtGmrOFOG2Cwr1ixoJZxCmC+S3aTu3Bia8WdeJ+BzmEk7d+4SAROE/TakqEtiAEZ X-Received: by 10.194.87.233 with SMTP id bb9mr3643138wjb.18.1465379320672; Wed, 08 Jun 2016 02:48:40 -0700 (PDT) Received: from ping.vm.6wind.com (guy78-3-82-239-227-177.fbx.proxad.net. [82.239.227.177]) by smtp.gmail.com with ESMTPSA id c185sm23899214wme.9.2016.06.08.02.48.39 (version=TLSv1/SSLv3 cipher=OTHER); Wed, 08 Jun 2016 02:48:40 -0700 (PDT) From: Nelio Laranjeiro To: dev@dpdk.org Cc: Adrien Mazarguil Date: Wed, 8 Jun 2016 11:48:10 +0200 Message-Id: <1465379291-25310-24-git-send-email-nelio.laranjeiro@6wind.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1465379291-25310-1-git-send-email-nelio.laranjeiro@6wind.com> References: <1465379291-25310-1-git-send-email-nelio.laranjeiro@6wind.com> Subject: [dpdk-dev] [PATCH 23/24] mlx5: make RX queue reinitialization safer X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 08 Jun 2016 09:48:41 -0000 From: Adrien Mazarguil The primary purpose of rxq_rehash() function is to stop and restart reception on a queue after re-posting buffers. This may fail if the array that temporarily stores existing buffers for reuse cannot be allocated. Update rxq_rehash() to work on the target queue directly (not through a template copy) and avoid this allocation. rxq_alloc_elts() is modified accordingly to take buffers from an existing queue directly and update their refcount. Unlike rxq_rehash(), rxq_setup() must work on a temporary structure but should not allocate new mbufs from the pool while reinitializing an existing queue. This is achieved by using the refcount-aware rxq_alloc_elts() before overwriting queue data. Signed-off-by: Adrien Mazarguil --- drivers/net/mlx5/mlx5_rxq.c | 94 ++++++++++++++++++++++++--------------------- 1 file changed, 51 insertions(+), 43 deletions(-) diff --git a/drivers/net/mlx5/mlx5_rxq.c b/drivers/net/mlx5/mlx5_rxq.c index 20a236e..17a28e4 100644 --- a/drivers/net/mlx5/mlx5_rxq.c +++ b/drivers/net/mlx5/mlx5_rxq.c @@ -642,7 +642,7 @@ priv_rehash_flows(struct priv *priv) */ static int rxq_alloc_elts(struct rxq_ctrl *rxq_ctrl, unsigned int elts_n, - struct rte_mbuf **pool) + struct rte_mbuf *(*pool)[]) { unsigned int i; int ret = 0; @@ -654,9 +654,10 @@ rxq_alloc_elts(struct rxq_ctrl *rxq_ctrl, unsigned int elts_n, &(*rxq_ctrl->rxq.wqes)[i]; if (pool != NULL) { - buf = *(pool++); + buf = (*pool)[i]; assert(buf != NULL); rte_pktmbuf_reset(buf); + rte_pktmbuf_refcnt_update(buf, 1); } else buf = rte_pktmbuf_alloc(rxq_ctrl->rxq.mp); if (buf == NULL) { @@ -781,7 +782,7 @@ rxq_cleanup(struct rxq_ctrl *rxq_ctrl) } /** - * Reconfigure a RX queue with new parameters. + * Reconfigure RX queue buffers. * * rxq_rehash() does not allocate mbufs, which, if not done from the right * thread (such as a control thread), may corrupt the pool. @@ -798,67 +799,48 @@ rxq_cleanup(struct rxq_ctrl *rxq_ctrl) int rxq_rehash(struct rte_eth_dev *dev, struct rxq_ctrl *rxq_ctrl) { - struct rxq_ctrl tmpl = *rxq_ctrl; - unsigned int mbuf_n; - unsigned int desc_n; - struct rte_mbuf **pool; - unsigned int i, k; + unsigned int elts_n = rxq_ctrl->rxq.elts_n; + unsigned int i; struct ibv_exp_wq_attr mod; int err; DEBUG("%p: rehashing queue %p", (void *)dev, (void *)rxq_ctrl); - /* Number of descriptors and mbufs currently allocated. */ - desc_n = tmpl.rxq.elts_n; - mbuf_n = desc_n; /* From now on, any failure will render the queue unusable. * Reinitialize WQ. */ mod = (struct ibv_exp_wq_attr){ .attr_mask = IBV_EXP_WQ_ATTR_STATE, .wq_state = IBV_EXP_WQS_RESET, }; - err = ibv_exp_modify_wq(tmpl.wq, &mod); + err = ibv_exp_modify_wq(rxq_ctrl->wq, &mod); if (err) { ERROR("%p: cannot reset WQ: %s", (void *)dev, strerror(err)); assert(err > 0); return err; } - /* Allocate pool. */ - pool = rte_malloc(__func__, (mbuf_n * sizeof(*pool)), 0); - if (pool == NULL) { - ERROR("%p: cannot allocate memory", (void *)dev); - return ENOBUFS; - } /* Snatch mbufs from original queue. */ - k = 0; - for (i = 0; (i != desc_n); ++i) - pool[k++] = (*rxq_ctrl->rxq.elts)[i]; - assert(k == mbuf_n); - rte_free(pool); + claim_zero(rxq_alloc_elts(rxq_ctrl, elts_n, rxq_ctrl->rxq.elts)); + for (i = 0; i != elts_n; ++i) { + struct rte_mbuf *buf = (*rxq_ctrl->rxq.elts)[i]; + + assert(rte_mbuf_refcnt_read(buf) == 2); + rte_pktmbuf_free_seg(buf); + } /* Change queue state to ready. */ mod = (struct ibv_exp_wq_attr){ .attr_mask = IBV_EXP_WQ_ATTR_STATE, .wq_state = IBV_EXP_WQS_RDY, }; - err = ibv_exp_modify_wq(tmpl.wq, &mod); + err = ibv_exp_modify_wq(rxq_ctrl->wq, &mod); if (err) { ERROR("%p: WQ state to IBV_EXP_WQS_RDY failed: %s", (void *)dev, strerror(err)); goto error; } - /* Post SGEs. */ - err = rxq_alloc_elts(&tmpl, desc_n, pool); - if (err) { - ERROR("%p: cannot reallocate WRs, aborting", (void *)dev); - rte_free(pool); - assert(err > 0); - return err; - } /* Update doorbell counter. */ - rxq_ctrl->rxq.rq_ci = desc_n; + rxq_ctrl->rxq.rq_ci = elts_n; rte_wmb(); *rxq_ctrl->rxq.rq_db = htonl(rxq_ctrl->rxq.rq_ci); error: - *rxq_ctrl = tmpl; assert(err >= 0); return err; } @@ -868,16 +850,21 @@ error: * * @param tmpl * Pointer to RX queue control template. - * @param rxq_ctrl - * Pointer to RX queue control. + * + * @return + * 0 on success, errno value on failure. */ -static inline void -rxq_setup(struct rxq_ctrl *tmpl, struct rxq_ctrl *rxq_ctrl) +static inline int +rxq_setup(struct rxq_ctrl *tmpl) { struct ibv_cq *ibcq = tmpl->cq; struct mlx5_cq *cq = to_mxxx(cq, cq); struct mlx5_rwq *rwq = container_of(tmpl->wq, struct mlx5_rwq, wq); + struct rte_mbuf *(*elts)[tmpl->rxq.elts_n] = + rte_calloc_socket("RXQ", 1, sizeof(*elts), 0, tmpl->socket); + if (elts == NULL) + return ENOMEM; tmpl->rxq.rq_db = rwq->rq.db; tmpl->rxq.cqe_n = ibcq->cqe + 1; tmpl->rxq.cq_ci = 0; @@ -889,9 +876,8 @@ rxq_setup(struct rxq_ctrl *tmpl, struct rxq_ctrl *rxq_ctrl) tmpl->rxq.cqes = (volatile struct mlx5_cqe64 (*)[]) (uintptr_t)cq->active_buf->buf; - tmpl->rxq.elts = - (struct rte_mbuf *(*)[tmpl->rxq.elts_n]) - ((uintptr_t)rxq_ctrl + sizeof(*rxq_ctrl)); + tmpl->rxq.elts = elts; + return 0; } /** @@ -938,6 +924,7 @@ rxq_ctrl_setup(struct rte_eth_dev *dev, struct rxq_ctrl *rxq_ctrl, enum ibv_exp_query_intf_status status; unsigned int mb_len = rte_pktmbuf_data_room_size(mp); unsigned int cqe_n = desc - 1; + struct rte_mbuf *(*elts)[desc] = NULL; int ret = 0; (void)conf; /* Thresholds configuration (ignored). */ @@ -1094,8 +1081,19 @@ rxq_ctrl_setup(struct rte_eth_dev *dev, struct rxq_ctrl *rxq_ctrl, (void *)dev, strerror(ret)); goto error; } - rxq_setup(&tmpl, rxq_ctrl); - ret = rxq_alloc_elts(&tmpl, desc, NULL); + ret = rxq_setup(&tmpl); + if (ret) { + ERROR("%p: cannot initialize RX queue structure: %s", + (void *)dev, strerror(ret)); + goto error; + } + /* Reuse buffers from original queue if possible. */ + if (rxq_ctrl->rxq.elts_n) { + assert(rxq_ctrl->rxq.elts_n == desc); + assert(rxq_ctrl->rxq.elts != tmpl.rxq.elts); + ret = rxq_alloc_elts(&tmpl, desc, rxq_ctrl->rxq.elts); + } else + ret = rxq_alloc_elts(&tmpl, desc, NULL); if (ret) { ERROR("%p: RXQ allocation failed: %s", (void *)dev, strerror(ret)); @@ -1104,6 +1102,14 @@ rxq_ctrl_setup(struct rte_eth_dev *dev, struct rxq_ctrl *rxq_ctrl, /* Clean up rxq in case we're reinitializing it. */ DEBUG("%p: cleaning-up old rxq just in case", (void *)rxq_ctrl); rxq_cleanup(rxq_ctrl); + /* Move mbuf pointers to dedicated storage area in RX queue. */ + elts = (void *)(rxq_ctrl + 1); + rte_memcpy(elts, tmpl.rxq.elts, sizeof(*elts)); +#ifndef NDEBUG + memset(tmpl.rxq.elts, 0x55, sizeof(*elts)); +#endif + rte_free(tmpl.rxq.elts); + tmpl.rxq.elts = elts; *rxq_ctrl = tmpl; /* Update doorbell counter. */ rxq_ctrl->rxq.rq_ci = desc; @@ -1113,7 +1119,9 @@ rxq_ctrl_setup(struct rte_eth_dev *dev, struct rxq_ctrl *rxq_ctrl, assert(ret == 0); return 0; error: + elts = tmpl.rxq.elts; rxq_cleanup(&tmpl); + rte_free(elts); assert(ret > 0); return ret; } -- 2.1.4