[PATCH net-next v4 02/13] net: mana: share the EQ pool across a queue-set swap
From: Long Li <longli@microsoft.com>
Date: 2026-09-08 03:29:27
Also in:
linux-hyperv, linux-rdma, lkml
Subsystem:
hyper-v/azure core and drivers, networking drivers, networking [general], the rest · Maintainers:
"K. Y. Srinivasan", Haiyang Zhang, Wei Liu, Dexuan Cui, Long Li, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Make the EQ pool port-owned so overlapping queue sets share EQs instead
of requiring old + new vector allocations. Allocate max_queues slots and
track populated entries with num_eqs.
Grow the pool before creating replacement CQs. Additional EQs survive
allocation failure in this patch and are released at port teardown.
Signed-off-by: Long Li <longli@microsoft.com>
---
Changes in v4:
- Clarify that allocation can grow the live, port-owned EQ pool and
that partial growth is retained at this stage of the series.
- Shorten the scratch-context ownership comments.
drivers/net/ethernet/microsoft/mana/mana_en.c | 86 ++++++++++++++++---
include/net/mana/mana.h | 6 +-
2 files changed, 76 insertions(+), 16 deletions(-)
diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c
index 5ac3ae9fd7ea2f786dddbd21d340884c008e1020..fc80d4bcde6c453d61222371d7763cff90b2a26a 100644
--- a/drivers/net/ethernet/microsoft/mana/mana_en.c
+++ b/drivers/net/ethernet/microsoft/mana/mana_en.c@@ -1733,7 +1733,7 @@ void mana_destroy_eq(struct mana_port_context *apc) debugfs_remove_recursive(apc->mana_eqs_debugfs); apc->mana_eqs_debugfs = NULL; - for (i = 0; i < apc->num_queues; i++) { + for (i = 0; i < apc->num_eqs; i++) { eq = apc->eqs[i].eq; if (!eq) continue;
@@ -1745,6 +1745,7 @@ void mana_destroy_eq(struct mana_port_context *apc) kfree(apc->eqs); apc->eqs = NULL; + apc->num_eqs = 0; } EXPORT_SYMBOL_NS(mana_destroy_eq, "NET_MANA");
@@ -1773,9 +1774,11 @@ int mana_create_eq(struct mana_port_context *apc) if (WARN_ON(apc->eqs)) return -EEXIST; - apc->eqs = kzalloc_objs(struct mana_eq, apc->num_queues); + /* Keep EQ array addresses stable while CQs reference them. */ + apc->eqs = kzalloc_objs(struct mana_eq, apc->max_queues); if (!apc->eqs) return -ENOMEM; + apc->num_eqs = 0; spec.type = GDMA_EQ; spec.monitor_avl_buf = false;
@@ -1805,6 +1808,7 @@ int mana_create_eq(struct mana_port_context *apc) } apc->eqs[i].eq->eq.irq = gic->irq; mana_create_eq_debugfs(apc, i); + apc->num_eqs = i + 1; } return 0;
@@ -1814,6 +1818,61 @@ int mana_create_eq(struct mana_port_context *apc) } EXPORT_SYMBOL_NS(mana_create_eq, "NET_MANA"); +/* Grow the shared EQ pool without replacing live entries. */ +static int mana_grow_eqs(struct mana_port_context *apc, unsigned int need) +{ + struct gdma_dev *gd = apc->ac->gdma_dev; + struct gdma_context *gc = gd->gdma_context; + struct gdma_queue_spec spec = {}; + struct gdma_irq_context *gic; + unsigned int i; + int err; + int msi; + + if (WARN_ON(!apc->eqs)) + return -EINVAL; + + if (need > apc->max_queues) + return -EINVAL; + + if (need <= apc->num_eqs) + return 0; + + spec.type = GDMA_EQ; + spec.monitor_avl_buf = false; + spec.queue_size = EQ_SIZE; + spec.eq.callback = NULL; + spec.eq.context = apc->eqs; + spec.eq.log2_throttle_limit = LOG2_EQ_THROTTLE; + + for (i = apc->num_eqs; i < need; i++) { + msi = (i + 1) % gc->num_msix_usable; + + gic = mana_gd_get_gic(gc, !gc->msi_sharing, &msi); + if (IS_ERR(gic)) { + err = PTR_ERR(gic); + goto out; + } + spec.eq.msix_index = msi; + + err = mana_gd_create_mana_eq(gd, &spec, &apc->eqs[i].eq); + if (err) { + dev_err(gc->dev, "Failed to grow EQ %u : %d\n", i, err); + mana_gd_put_gic(gc, !gc->msi_sharing, msi); + goto out; + } + apc->eqs[i].eq->eq.irq = gic->irq; + mana_create_eq_debugfs(apc, i); + apc->num_eqs = i + 1; + } + + return 0; +out: + /* Retain partial growth for reuse; the live set still needs this pool. + */ + return err; +} + static int mana_fence_rq(struct mana_port_context *apc, struct mana_rxq *rxq) { struct mana_fence_rq_resp resp = {};
@@ -3814,7 +3873,6 @@ static int mana_dealloc_queues(struct net_device *ndev) static void mana_qset_snapshot(const struct mana_port_context *ctx, struct mana_qset *out) { - out->eqs = ctx->eqs; out->tx_qp = ctx->tx_qp; out->rxqs = ctx->rxqs; out->indir_table = ctx->indir_table;
@@ -3831,7 +3889,6 @@ static void mana_qset_snapshot(const struct mana_port_context *ctx, static void mana_qset_install(struct mana_port_context *ctx, const struct mana_qset *qset) { - ctx->eqs = qset->eqs; ctx->tx_qp = qset->tx_qp; ctx->rxqs = qset->rxqs; ctx->indir_table = qset->indir_table;
@@ -3844,7 +3901,9 @@ static void mana_qset_install(struct mana_port_context *ctx, ctx->priv_flags = qset->priv_flags; } -/* Copy the vport identity without borrowing the live queues. */ +/* Scratch starts without SQs/RQs and borrows the port's EQ pool. Never call + * mana_destroy_eq() on it. + */ struct mana_port_context *mana_qset_scratch_alloc(struct mana_port_context *apc) { struct mana_port_context *scratch;
@@ -3855,13 +3914,11 @@ struct mana_port_context *mana_qset_scratch_alloc(struct mana_port_context *apc) *scratch = *apc; - scratch->eqs = NULL; scratch->tx_qp = NULL; scratch->rxqs = NULL; scratch->indir_table = NULL; scratch->rxobj_table = NULL; scratch->default_rxobj = INVALID_MANA_HANDLE; - scratch->mana_eqs_debugfs = NULL; /* Do not consume the live set's pre-allocated RX buffers. */ scratch->rxbufs_pre = NULL;
@@ -3879,7 +3936,8 @@ void mana_qset_scratch_free(struct mana_port_context *scratch) kvfree(scratch); } -int mana_alloc_qset(struct mana_port_context *scratch, unsigned int num_queues, +int mana_alloc_qset(struct mana_port_context *apc, + struct mana_port_context *scratch, unsigned int num_queues, unsigned int rx_queue_size, unsigned int tx_queue_size, u32 priv_flags, struct mana_qset *out) {
@@ -3901,13 +3959,16 @@ int mana_alloc_qset(struct mana_port_context *scratch, unsigned int num_queues, if (err) goto cleanup_rxq_array; - err = mana_create_eq(scratch); + err = mana_grow_eqs(apc, num_queues); if (err) goto cleanup_rss; + scratch->eqs = apc->eqs; + scratch->num_eqs = apc->num_eqs; + err = mana_create_txq(scratch, ndev); if (err) - goto cleanup_eq; + goto cleanup_rss; err = mana_add_rx_queues(scratch, ndev); if (err)
@@ -3921,8 +3982,6 @@ int mana_alloc_qset(struct mana_port_context *scratch, unsigned int num_queues, cleanup_rxq: mana_destroy_rxqs(scratch); mana_destroy_txq(scratch); -cleanup_eq: - mana_destroy_eq(scratch); cleanup_rss: mana_cleanup_indir_table(scratch); cleanup_rxq_array:
@@ -3942,7 +4001,7 @@ void mana_free_qset(struct mana_port_context *scratch, struct mana_qset *qset) ASSERT_RTNL(); - if (!qset->rxqs && !qset->tx_qp && !qset->eqs) + if (!qset->rxqs && !qset->tx_qp) return; if (qset->tx_qp) {
@@ -3995,7 +4054,6 @@ void mana_free_qset(struct mana_port_context *scratch, struct mana_qset *qset) mana_chn_xdp_release(retiring_prog, retiring_queues); mana_destroy_txq(scratch); - mana_destroy_eq(scratch); mana_cleanup_indir_table(scratch); kfree(scratch->rxqs); scratch->rxqs = NULL;
diff --git a/include/net/mana/mana.h b/include/net/mana/mana.h
index 4c00a98430262b6c8c25bc37c9d1c8b48d928629..de026eeb8fc25f80d3e0f9613fb277eae9ae19a9 100644
--- a/include/net/mana/mana.h
+++ b/include/net/mana/mana.h@@ -570,7 +570,9 @@ struct mana_port_context { u8 mac_addr[ETH_ALEN]; + /* Port-owned EQ pool: max_queues slots, num_eqs populated. */ struct mana_eq *eqs; + unsigned int num_eqs; struct dentry *mana_eqs_debugfs; enum TRI_STATE rss_state;
@@ -673,7 +675,6 @@ struct mana_port_context { }; struct mana_qset { - struct mana_eq *eqs; struct mana_tx_qp **tx_qp; struct mana_rxq **rxqs;
@@ -701,7 +702,8 @@ int mana_detach(struct net_device *ndev, bool from_close); struct mana_port_context * mana_qset_scratch_alloc(struct mana_port_context *apc); void mana_qset_scratch_free(struct mana_port_context *scratch); -int mana_alloc_qset(struct mana_port_context *scratch, unsigned int num_queues, +int mana_alloc_qset(struct mana_port_context *apc, + struct mana_port_context *scratch, unsigned int num_queues, unsigned int rx_queue_size, unsigned int tx_queue_size, u32 priv_flags, struct mana_qset *out); void mana_free_qset(struct mana_port_context *scratch, struct mana_qset *qset);
--
2.43.0