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Message-ID: <20250723073804.GA19640@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net>
Date: Wed, 23 Jul 2025 00:38:04 -0700
From: Saurabh Singh Sengar <ssengar@...ux.microsoft.com>
To: Dipayaan Roy <dipayanroy@...ux.microsoft.com>
Cc: kuba@...nel.org, kys@...rosoft.com, haiyangz@...rosoft.com,
wei.liu@...nel.org, decui@...rosoft.com, andrew+netdev@...n.ch,
davem@...emloft.net, edumazet@...gle.com, pabeni@...hat.com,
longli@...rosoft.com, kotaranov@...rosoft.com, horms@...nel.org,
ast@...nel.org, daniel@...earbox.net, hawk@...nel.org,
john.fastabend@...il.com, sdf@...ichev.me, lorenzo@...nel.org,
michal.kubiak@...el.com, ernis@...ux.microsoft.com,
shradhagupta@...ux.microsoft.com, shirazsaleem@...rosoft.com,
rosenp@...il.com, netdev@...r.kernel.org,
linux-hyperv@...r.kernel.org, linux-rdma@...r.kernel.org,
bpf@...r.kernel.org
Subject: Re: [PATCH] net: mana: Use page pool fragments for RX buffers
instead of full pages to improve memory efficiency and throughput.
On Mon, Jul 21, 2025 at 03:14:17AM -0700, Dipayaan Roy wrote:
> This patch enhances RX buffer handling in the mana driver by allocating
> pages from a page pool and slicing them into MTU-sized fragments, rather
> than dedicating a full page per packet. This approach is especially
> beneficial on systems with 64KB page sizes.
>
> Key improvements:
>
> - Proper integration of page pool for RX buffer allocations.
> - MTU-sized buffer slicing to improve memory utilization.
> - Reduce overall per Rx queue memory footprint.
> - Automatic fallback to full-page buffers when:
> * Jumbo frames are enabled (MTU > PAGE_SIZE / 2).
> * The XDP path is active, to avoid complexities with fragment reuse.
> - Removal of redundant pre-allocated RX buffers used in scenarios like MTU
> changes, ensuring consistency in RX buffer allocation.
>
> Testing on VMs with 64KB pages shows around 200% throughput improvement.
> Memory efficiency is significantly improved due to reduced wastage in page
> allocations. Example: We are now able to fit 35 Rx buffers in a single 64KB
> page for MTU size of 1500, instead of 1 Rx buffer per page previously.
>
> Tested:
>
> - iperf3, iperf2, and nttcp benchmarks.
> - Jumbo frames with MTU 9000.
> - Native XDP programs (XDP_PASS, XDP_DROP, XDP_TX, XDP_REDIRECT) for
> testing the driver’s XDP path.
> - Page leak detection (kmemleak).
> - Driver load/unload, reboot, and stress scenarios.
>
> Signed-off-by: Dipayaan Roy <dipayanroy@...ux.microsoft.com>
> ---
> .../net/ethernet/microsoft/mana/mana_bpf.c | 22 +-
> drivers/net/ethernet/microsoft/mana/mana_en.c | 284 ++++++------------
> .../ethernet/microsoft/mana/mana_ethtool.c | 13 -
> include/net/mana/mana.h | 13 +-
> 4 files changed, 115 insertions(+), 217 deletions(-)
>
> diff --git a/drivers/net/ethernet/microsoft/mana/mana_bpf.c b/drivers/net/ethernet/microsoft/mana/mana_bpf.c
> index d30721d4516f..96813b6c184f 100644
> --- a/drivers/net/ethernet/microsoft/mana/mana_bpf.c
> +++ b/drivers/net/ethernet/microsoft/mana/mana_bpf.c
> @@ -174,6 +174,7 @@ static int mana_xdp_set(struct net_device *ndev, struct bpf_prog *prog,
> struct mana_port_context *apc = netdev_priv(ndev);
> struct bpf_prog *old_prog;
> struct gdma_context *gc;
> + int err;
>
> gc = apc->ac->gdma_dev->gdma_context;
>
> @@ -198,14 +199,33 @@ static int mana_xdp_set(struct net_device *ndev, struct bpf_prog *prog,
> if (old_prog)
> bpf_prog_put(old_prog);
>
> - if (apc->port_is_up)
> + if (apc->port_is_up) {
> + /* Re-create rxq's after xdp prog was loaded or unloaded.
> + * Ex: re create rxq's to switch from full pages to smaller
> + * size page fragments when xdp prog is unloaded and vice-versa.
> + */
> +
> + err = mana_detach(ndev, false);
> + if (err) {
> + netdev_err(ndev, "mana_detach failed at xdp set: %d\n", err);
> + goto out;
You should return err. At out we are always returning 0 which is wrong.
> + }
> +
> + err = mana_attach(ndev);
> + if (err) {
> + netdev_err(ndev, "mana_attach failed at xdp set: %d\n", err);
> + goto out;
same here.
> + }
> +
> mana_chn_setxdp(apc, prog);
> + }
>
> if (prog)
> ndev->max_mtu = MANA_XDP_MTU_MAX;
> else
> ndev->max_mtu = gc->adapter_mtu - ETH_HLEN;
>
> +out:
> return 0;
> }
>
> diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c
> index a7973651ae51..a474c59c907c 100644
> --- a/drivers/net/ethernet/microsoft/mana/mana_en.c
> +++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
> @@ -548,171 +548,45 @@ static u16 mana_select_queue(struct net_device *ndev, struct sk_buff *skb,
> return txq;
> }
>
> -/* Release pre-allocated RX buffers */
> -void mana_pre_dealloc_rxbufs(struct mana_port_context *mpc)
> -{
> - struct device *dev;
> - int i;
> -
> - dev = mpc->ac->gdma_dev->gdma_context->dev;
> -
> - if (!mpc->rxbufs_pre)
> - goto out1;
> -
> - if (!mpc->das_pre)
> - goto out2;
> -
> - while (mpc->rxbpre_total) {
> - i = --mpc->rxbpre_total;
> - dma_unmap_single(dev, mpc->das_pre[i], mpc->rxbpre_datasize,
> - DMA_FROM_DEVICE);
> - put_page(virt_to_head_page(mpc->rxbufs_pre[i]));
> - }
> -
> - kfree(mpc->das_pre);
> - mpc->das_pre = NULL;
> -
> -out2:
> - kfree(mpc->rxbufs_pre);
> - mpc->rxbufs_pre = NULL;
> -
> -out1:
> - mpc->rxbpre_datasize = 0;
> - mpc->rxbpre_alloc_size = 0;
> - mpc->rxbpre_headroom = 0;
> -}
> -
> -/* Get a buffer from the pre-allocated RX buffers */
> -static void *mana_get_rxbuf_pre(struct mana_rxq *rxq, dma_addr_t *da)
> -{
> - struct net_device *ndev = rxq->ndev;
> - struct mana_port_context *mpc;
> - void *va;
> -
> - mpc = netdev_priv(ndev);
> -
> - if (!mpc->rxbufs_pre || !mpc->das_pre || !mpc->rxbpre_total) {
> - netdev_err(ndev, "No RX pre-allocated bufs\n");
> - return NULL;
> - }
> -
> - /* Check sizes to catch unexpected coding error */
> - if (mpc->rxbpre_datasize != rxq->datasize) {
> - netdev_err(ndev, "rxbpre_datasize mismatch: %u: %u\n",
> - mpc->rxbpre_datasize, rxq->datasize);
> - return NULL;
> - }
> -
> - if (mpc->rxbpre_alloc_size != rxq->alloc_size) {
> - netdev_err(ndev, "rxbpre_alloc_size mismatch: %u: %u\n",
> - mpc->rxbpre_alloc_size, rxq->alloc_size);
> - return NULL;
> - }
> -
> - if (mpc->rxbpre_headroom != rxq->headroom) {
> - netdev_err(ndev, "rxbpre_headroom mismatch: %u: %u\n",
> - mpc->rxbpre_headroom, rxq->headroom);
> - return NULL;
> - }
> -
> - mpc->rxbpre_total--;
> -
> - *da = mpc->das_pre[mpc->rxbpre_total];
> - va = mpc->rxbufs_pre[mpc->rxbpre_total];
> - mpc->rxbufs_pre[mpc->rxbpre_total] = NULL;
> -
> - /* Deallocate the array after all buffers are gone */
> - if (!mpc->rxbpre_total)
> - mana_pre_dealloc_rxbufs(mpc);
> -
> - return va;
> -}
> -
> /* Get RX buffer's data size, alloc size, XDP headroom based on MTU */
> -static void mana_get_rxbuf_cfg(int mtu, u32 *datasize, u32 *alloc_size,
> - u32 *headroom)
> +static void mana_get_rxbuf_cfg(struct mana_port_context *apc,
> + int mtu, u32 *datasize, u32 *alloc_size,
> + u32 *headroom, u32 *frag_count)
> {
> - if (mtu > MANA_XDP_MTU_MAX)
> - *headroom = 0; /* no support for XDP */
> - else
> - *headroom = XDP_PACKET_HEADROOM;
> -
> - *alloc_size = SKB_DATA_ALIGN(mtu + MANA_RXBUF_PAD + *headroom);
> -
> - /* Using page pool in this case, so alloc_size is PAGE_SIZE */
> - if (*alloc_size < PAGE_SIZE)
> - *alloc_size = PAGE_SIZE;
> -
> + /* Calculate datasize first (consistent across all cases) */
> *datasize = mtu + ETH_HLEN;
> -}
> -
> -int mana_pre_alloc_rxbufs(struct mana_port_context *mpc, int new_mtu, int num_queues)
> -{
> - struct device *dev;
> - struct page *page;
> - dma_addr_t da;
> - int num_rxb;
> - void *va;
> - int i;
> -
> - mana_get_rxbuf_cfg(new_mtu, &mpc->rxbpre_datasize,
> - &mpc->rxbpre_alloc_size, &mpc->rxbpre_headroom);
> -
> - dev = mpc->ac->gdma_dev->gdma_context->dev;
> -
> - num_rxb = num_queues * mpc->rx_queue_size;
> -
> - WARN(mpc->rxbufs_pre, "mana rxbufs_pre exists\n");
> - mpc->rxbufs_pre = kmalloc_array(num_rxb, sizeof(void *), GFP_KERNEL);
> - if (!mpc->rxbufs_pre)
> - goto error;
>
> - mpc->das_pre = kmalloc_array(num_rxb, sizeof(dma_addr_t), GFP_KERNEL);
> - if (!mpc->das_pre)
> - goto error;
> -
> - mpc->rxbpre_total = 0;
> -
> - for (i = 0; i < num_rxb; i++) {
> - page = dev_alloc_pages(get_order(mpc->rxbpre_alloc_size));
> - if (!page)
> - goto error;
> -
> - va = page_to_virt(page);
> -
> - da = dma_map_single(dev, va + mpc->rxbpre_headroom,
> - mpc->rxbpre_datasize, DMA_FROM_DEVICE);
> - if (dma_mapping_error(dev, da)) {
> - put_page(page);
> - goto error;
> + /* For xdp and jumbo frames make sure only one packet fits per page */
> + if (((mtu + MANA_RXBUF_PAD) > PAGE_SIZE / 2) || rcu_access_pointer(apc->bpf_prog)) {
> + if (rcu_access_pointer(apc->bpf_prog)) {
> + *headroom = XDP_PACKET_HEADROOM;
> + *alloc_size = PAGE_SIZE;
> + } else {
> + *headroom = 0; /* no support for XDP */
> + *alloc_size = SKB_DATA_ALIGN(mtu + MANA_RXBUF_PAD + *headroom);
> }
>
> - mpc->rxbufs_pre[i] = va;
> - mpc->das_pre[i] = da;
> - mpc->rxbpre_total = i + 1;
> + *frag_count = 1;
> + return;
> }
>
> - return 0;
> + /* Standard MTU case - optimize for multiple packets per page */
> + *headroom = 0;
>
> -error:
> - netdev_err(mpc->ndev, "Failed to pre-allocate RX buffers for %d queues\n", num_queues);
> - mana_pre_dealloc_rxbufs(mpc);
> - return -ENOMEM;
> + /* Calculate base buffer size needed */
> + u32 len = SKB_DATA_ALIGN(mtu + MANA_RXBUF_PAD + *headroom);
> + u32 buf_size = ALIGN(len, MANA_RX_FRAG_ALIGNMENT);
its good to have all the declaration at start of function.
> +
> + /* Calculate how many packets can fit in a page */
> + *frag_count = PAGE_SIZE / buf_size;
> + *alloc_size = buf_size;
> }
>
> static int mana_change_mtu(struct net_device *ndev, int new_mtu)
> {
> - struct mana_port_context *mpc = netdev_priv(ndev);
> unsigned int old_mtu = ndev->mtu;
> int err;
>
> - /* Pre-allocate buffers to prevent failure in mana_attach later */
> - err = mana_pre_alloc_rxbufs(mpc, new_mtu, mpc->num_queues);
> - if (err) {
> - netdev_err(ndev, "Insufficient memory for new MTU\n");
> - return err;
> - }
> -
> err = mana_detach(ndev, false);
> if (err) {
> netdev_err(ndev, "mana_detach failed: %d\n", err);
> @@ -728,7 +602,6 @@ static int mana_change_mtu(struct net_device *ndev, int new_mtu)
> }
>
> out:
> - mana_pre_dealloc_rxbufs(mpc);
> return err;
> }
>
> @@ -1841,8 +1714,11 @@ static void mana_rx_skb(void *buf_va, bool from_pool,
>
> drop:
> if (from_pool) {
> - page_pool_recycle_direct(rxq->page_pool,
> - virt_to_head_page(buf_va));
> + if (rxq->frag_count == 1)
> + page_pool_recycle_direct(rxq->page_pool,
> + virt_to_head_page(buf_va));
> + else
> + page_pool_free_va(rxq->page_pool, buf_va, true);
> } else {
> WARN_ON_ONCE(rxq->xdp_save_va);
> /* Save for reuse */
> @@ -1854,37 +1730,50 @@ static void mana_rx_skb(void *buf_va, bool from_pool,
> return;
> }
>
> -static void *mana_get_rxfrag(struct mana_rxq *rxq, struct device *dev,
> - dma_addr_t *da, bool *from_pool)
> +static void *mana_get_rxfrag(struct mana_rxq *rxq,
> + struct device *dev, dma_addr_t *da, bool *from_pool)
> {
> struct page *page;
> + u32 offset;
> void *va;
> -
> *from_pool = false;
>
> - /* Reuse XDP dropped page if available */
> - if (rxq->xdp_save_va) {
> - va = rxq->xdp_save_va;
> - rxq->xdp_save_va = NULL;
> - } else {
> - page = page_pool_dev_alloc_pages(rxq->page_pool);
> - if (!page)
> + /* Don't use fragments for jumbo frames or XDP (i.e when fragment = 1 per page) */
> + if (rxq->frag_count == 1) {
> + /* Reuse XDP dropped page if available */
> + if (rxq->xdp_save_va) {
> + va = rxq->xdp_save_va;
> + rxq->xdp_save_va = NULL;
> + } else {
> + page = page_pool_dev_alloc_pages(rxq->page_pool);
> + if (!page)
> + return NULL;
> +
> + *from_pool = true;
> + va = page_to_virt(page);
> + }
> +
> + *da = dma_map_single(dev, va + rxq->headroom, rxq->datasize,
> + DMA_FROM_DEVICE);
> + if (dma_mapping_error(dev, *da)) {
> + if (*from_pool)
> + page_pool_put_full_page(rxq->page_pool, page, false);
> + else
> + put_page(virt_to_head_page(va));
> +
> return NULL;
> + }
>
> - *from_pool = true;
> - va = page_to_virt(page);
> + return va;
> }
>
> - *da = dma_map_single(dev, va + rxq->headroom, rxq->datasize,
> - DMA_FROM_DEVICE);
> - if (dma_mapping_error(dev, *da)) {
> - if (*from_pool)
> - page_pool_put_full_page(rxq->page_pool, page, false);
> - else
> - put_page(virt_to_head_page(va));
> -
> + page = page_pool_dev_alloc_frag(rxq->page_pool, &offset, rxq->alloc_size);
> + if (!page)
> return NULL;
> - }
> +
> + va = page_to_virt(page) + offset;
> + *da = page_pool_get_dma_addr(page) + offset + rxq->headroom;
> + *from_pool = true;
>
> return va;
> }
> @@ -1901,9 +1790,9 @@ static void mana_refill_rx_oob(struct device *dev, struct mana_rxq *rxq,
> va = mana_get_rxfrag(rxq, dev, &da, &from_pool);
> if (!va)
> return;
> -
> - dma_unmap_single(dev, rxoob->sgl[0].address, rxq->datasize,
> - DMA_FROM_DEVICE);
> + if (!rxoob->from_pool || rxq->frag_count == 1)
> + dma_unmap_single(dev, rxoob->sgl[0].address, rxq->datasize,
> + DMA_FROM_DEVICE);
> *old_buf = rxoob->buf_va;
> *old_fp = rxoob->from_pool;
>
> @@ -2314,15 +2203,19 @@ static void mana_destroy_rxq(struct mana_port_context *apc,
> if (!rx_oob->buf_va)
> continue;
>
> - dma_unmap_single(dev, rx_oob->sgl[0].address,
> - rx_oob->sgl[0].size, DMA_FROM_DEVICE);
> -
> page = virt_to_head_page(rx_oob->buf_va);
>
> - if (rx_oob->from_pool)
> - page_pool_put_full_page(rxq->page_pool, page, false);
> - else
> - put_page(page);
> + if (rxq->frag_count == 1) {
> + dma_unmap_single(dev, rx_oob->sgl[0].address, rx_oob->sgl[0].size,
> + DMA_FROM_DEVICE);
> +
> + if (rx_oob->from_pool)
> + page_pool_put_full_page(rxq->page_pool, page, false);
> + else
> + put_page(page);
> + } else {
> + page_pool_free_va(rxq->page_pool, rx_oob->buf_va, true);
> + }
>
> rx_oob->buf_va = NULL;
> }
> @@ -2338,16 +2231,11 @@ static void mana_destroy_rxq(struct mana_port_context *apc,
> static int mana_fill_rx_oob(struct mana_recv_buf_oob *rx_oob, u32 mem_key,
> struct mana_rxq *rxq, struct device *dev)
> {
> - struct mana_port_context *mpc = netdev_priv(rxq->ndev);
> bool from_pool = false;
> dma_addr_t da;
> void *va;
>
> - if (mpc->rxbufs_pre)
> - va = mana_get_rxbuf_pre(rxq, &da);
> - else
> - va = mana_get_rxfrag(rxq, dev, &da, &from_pool);
> -
> + va = mana_get_rxfrag(rxq, dev, &da, &from_pool);
> if (!va)
> return -ENOMEM;
>
> @@ -2428,11 +2316,22 @@ static int mana_create_page_pool(struct mana_rxq *rxq, struct gdma_context *gc)
> struct page_pool_params pprm = {};
> int ret;
>
> - pprm.pool_size = mpc->rx_queue_size;
> + pprm.pool_size = mpc->rx_queue_size / rxq->frag_count + 1;
> pprm.nid = gc->numa_node;
> pprm.napi = &rxq->rx_cq.napi;
> pprm.netdev = rxq->ndev;
> pprm.order = get_order(rxq->alloc_size);
> + pprm.queue_idx = rxq->rxq_idx;
> + pprm.dev = gc->dev;
> +
> + /* Let the page pool do the dma map when page sharing with multiple fragments
> + * enabled for rx buffers.
> + */
> + if (rxq->frag_count > 1) {
> + pprm.flags = PP_FLAG_DMA_MAP | PP_FLAG_DMA_SYNC_DEV;
> + pprm.max_len = PAGE_SIZE;
> + pprm.dma_dir = DMA_FROM_DEVICE;
> + }
>
> rxq->page_pool = page_pool_create(&pprm);
>
> @@ -2471,9 +2370,8 @@ static struct mana_rxq *mana_create_rxq(struct mana_port_context *apc,
> rxq->rxq_idx = rxq_idx;
> rxq->rxobj = INVALID_MANA_HANDLE;
>
> - mana_get_rxbuf_cfg(ndev->mtu, &rxq->datasize, &rxq->alloc_size,
> - &rxq->headroom);
> -
> + mana_get_rxbuf_cfg(apc, ndev->mtu, &rxq->datasize, &rxq->alloc_size,
> + &rxq->headroom, &rxq->frag_count);
> /* Create page pool for RX queue */
> err = mana_create_page_pool(rxq, gc);
> if (err) {
> diff --git a/drivers/net/ethernet/microsoft/mana/mana_ethtool.c b/drivers/net/ethernet/microsoft/mana/mana_ethtool.c
> index a1afa75a9463..7ede03c74fb9 100644
> --- a/drivers/net/ethernet/microsoft/mana/mana_ethtool.c
> +++ b/drivers/net/ethernet/microsoft/mana/mana_ethtool.c
> @@ -396,12 +396,6 @@ static int mana_set_channels(struct net_device *ndev,
> unsigned int old_count = apc->num_queues;
> int err;
>
> - err = mana_pre_alloc_rxbufs(apc, ndev->mtu, new_count);
> - if (err) {
> - netdev_err(ndev, "Insufficient memory for new allocations");
> - return err;
> - }
> -
> err = mana_detach(ndev, false);
> if (err) {
> netdev_err(ndev, "mana_detach failed: %d\n", err);
> @@ -416,7 +410,6 @@ static int mana_set_channels(struct net_device *ndev,
> }
>
> out:
> - mana_pre_dealloc_rxbufs(apc);
> return err;
> }
>
> @@ -465,12 +458,7 @@ static int mana_set_ringparam(struct net_device *ndev,
>
> /* pre-allocating new buffers to prevent failures in mana_attach() later */
> apc->rx_queue_size = new_rx;
> - err = mana_pre_alloc_rxbufs(apc, ndev->mtu, apc->num_queues);
> apc->rx_queue_size = old_rx;
> - if (err) {
> - netdev_err(ndev, "Insufficient memory for new allocations\n");
> - return err;
> - }
>
> err = mana_detach(ndev, false);
> if (err) {
> @@ -488,7 +476,6 @@ static int mana_set_ringparam(struct net_device *ndev,
> apc->rx_queue_size = old_rx;
> }
> out:
> - mana_pre_dealloc_rxbufs(apc);
> return err;
> }
>
> diff --git a/include/net/mana/mana.h b/include/net/mana/mana.h
> index e1030a7d2daa..99a3847b0f9d 100644
> --- a/include/net/mana/mana.h
> +++ b/include/net/mana/mana.h
> @@ -65,6 +65,8 @@ enum TRI_STATE {
> #define MANA_STATS_RX_COUNT 5
> #define MANA_STATS_TX_COUNT 11
>
> +#define MANA_RX_FRAG_ALIGNMENT 64
> +
> struct mana_stats_rx {
> u64 packets;
> u64 bytes;
> @@ -328,6 +330,7 @@ struct mana_rxq {
> u32 datasize;
> u32 alloc_size;
> u32 headroom;
> + u32 frag_count;
>
> mana_handle_t rxobj;
>
> @@ -503,14 +506,6 @@ struct mana_port_context {
> /* This points to an array of num_queues of RQ pointers. */
> struct mana_rxq **rxqs;
>
> - /* pre-allocated rx buffer array */
> - void **rxbufs_pre;
> - dma_addr_t *das_pre;
> - int rxbpre_total;
> - u32 rxbpre_datasize;
> - u32 rxbpre_alloc_size;
> - u32 rxbpre_headroom;
> -
> struct bpf_prog *bpf_prog;
>
> /* Create num_queues EQs, SQs, SQ-CQs, RQs and RQ-CQs, respectively. */
> @@ -574,8 +569,6 @@ int mana_query_link_cfg(struct mana_port_context *apc);
> int mana_set_bw_clamp(struct mana_port_context *apc, u32 speed,
> int enable_clamping);
> void mana_query_phy_stats(struct mana_port_context *apc);
> -int mana_pre_alloc_rxbufs(struct mana_port_context *apc, int mtu, int num_queues);
> -void mana_pre_dealloc_rxbufs(struct mana_port_context *apc);
>
> extern const struct ethtool_ops mana_ethtool_ops;
> extern struct dentry *mana_debugfs_root;
> --
> 2.43.0
Rest looks good. After fixing above,
Reviewed-by: Saurabh Sengar <ssengar@...ux.microsoft.com>
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