From 770f52d5a0ed9ea3e3b8f04927eac520cab97935 Mon Sep 17 00:00:00 2001 From: Shailend Chand Date: Wed, 1 May 2024 23:25:46 +0000 Subject: gve: Reset Rx ring state in the ring-stop funcs This does not fix any existing bug. In anticipation of the ndo queue api hooks that alloc/free/start/stop a single Rx queue, the already existing per-queue stop functions are being made more robust. Specifically for this use case: rx_queue_n.stop() + rx_queue_n.start() Note that this is not the use case being used in devmem tcp (the first place these new ndo hooks would be used). There the usecase is: new_queue.alloc() + old_queue.stop() + new_queue.start() + old_queue.free() Tested-by: Mina Almasry Reviewed-by: Praveen Kaligineedi Reviewed-by: Harshitha Ramamurthy Signed-off-by: Shailend Chand Signed-off-by: David S. Miller --- drivers/net/ethernet/google/gve/gve_rx.c | 48 ++++++++++--- drivers/net/ethernet/google/gve/gve_rx_dqo.c | 102 ++++++++++++++++++++++----- 2 files changed, 120 insertions(+), 30 deletions(-) (limited to 'drivers') diff --git a/drivers/net/ethernet/google/gve/gve_rx.c b/drivers/net/ethernet/google/gve/gve_rx.c index 0a3f88170411..79c1d8f63621 100644 --- a/drivers/net/ethernet/google/gve/gve_rx.c +++ b/drivers/net/ethernet/google/gve/gve_rx.c @@ -53,6 +53,41 @@ static void gve_rx_unfill_pages(struct gve_priv *priv, rx->data.page_info = NULL; } +static void gve_rx_ctx_clear(struct gve_rx_ctx *ctx) +{ + ctx->skb_head = NULL; + ctx->skb_tail = NULL; + ctx->total_size = 0; + ctx->frag_cnt = 0; + ctx->drop_pkt = false; +} + +static void gve_rx_init_ring_state_gqi(struct gve_rx_ring *rx) +{ + rx->desc.seqno = 1; + rx->cnt = 0; + gve_rx_ctx_clear(&rx->ctx); +} + +static void gve_rx_reset_ring_gqi(struct gve_priv *priv, int idx) +{ + struct gve_rx_ring *rx = &priv->rx[idx]; + const u32 slots = priv->rx_desc_cnt; + size_t size; + + /* Reset desc ring */ + if (rx->desc.desc_ring) { + size = slots * sizeof(rx->desc.desc_ring[0]); + memset(rx->desc.desc_ring, 0, size); + } + + /* Reset q_resources */ + if (rx->q_resources) + memset(rx->q_resources, 0, sizeof(*rx->q_resources)); + + gve_rx_init_ring_state_gqi(rx); +} + void gve_rx_stop_ring_gqi(struct gve_priv *priv, int idx) { int ntfy_idx = gve_rx_idx_to_ntfy(priv, idx); @@ -62,6 +97,7 @@ void gve_rx_stop_ring_gqi(struct gve_priv *priv, int idx) gve_remove_napi(priv, ntfy_idx); gve_rx_remove_from_block(priv, idx); + gve_rx_reset_ring_gqi(priv, idx); } static void gve_rx_free_ring_gqi(struct gve_priv *priv, struct gve_rx_ring *rx, @@ -222,15 +258,6 @@ alloc_err_rda: return err; } -static void gve_rx_ctx_clear(struct gve_rx_ctx *ctx) -{ - ctx->skb_head = NULL; - ctx->skb_tail = NULL; - ctx->total_size = 0; - ctx->frag_cnt = 0; - ctx->drop_pkt = false; -} - void gve_rx_start_ring_gqi(struct gve_priv *priv, int idx) { int ntfy_idx = gve_rx_idx_to_ntfy(priv, idx); @@ -309,9 +336,8 @@ static int gve_rx_alloc_ring_gqi(struct gve_priv *priv, err = -ENOMEM; goto abort_with_q_resources; } - rx->cnt = 0; rx->db_threshold = slots / 2; - rx->desc.seqno = 1; + gve_rx_init_ring_state_gqi(rx); rx->packet_buffer_size = GVE_DEFAULT_RX_BUFFER_SIZE; gve_rx_ctx_clear(&rx->ctx); diff --git a/drivers/net/ethernet/google/gve/gve_rx_dqo.c b/drivers/net/ethernet/google/gve/gve_rx_dqo.c index 53fd2d87233f..7c2980c212f4 100644 --- a/drivers/net/ethernet/google/gve/gve_rx_dqo.c +++ b/drivers/net/ethernet/google/gve/gve_rx_dqo.c @@ -211,6 +211,82 @@ static void gve_rx_free_hdr_bufs(struct gve_priv *priv, struct gve_rx_ring *rx) } } +static void gve_rx_init_ring_state_dqo(struct gve_rx_ring *rx, + const u32 buffer_queue_slots, + const u32 completion_queue_slots) +{ + int i; + + /* Set buffer queue state */ + rx->dqo.bufq.mask = buffer_queue_slots - 1; + rx->dqo.bufq.head = 0; + rx->dqo.bufq.tail = 0; + + /* Set completion queue state */ + rx->dqo.complq.num_free_slots = completion_queue_slots; + rx->dqo.complq.mask = completion_queue_slots - 1; + rx->dqo.complq.cur_gen_bit = 0; + rx->dqo.complq.head = 0; + + /* Set RX SKB context */ + rx->ctx.skb_head = NULL; + rx->ctx.skb_tail = NULL; + + /* Set up linked list of buffer IDs */ + if (rx->dqo.buf_states) { + for (i = 0; i < rx->dqo.num_buf_states - 1; i++) + rx->dqo.buf_states[i].next = i + 1; + rx->dqo.buf_states[rx->dqo.num_buf_states - 1].next = -1; + } + + rx->dqo.free_buf_states = 0; + rx->dqo.recycled_buf_states.head = -1; + rx->dqo.recycled_buf_states.tail = -1; + rx->dqo.used_buf_states.head = -1; + rx->dqo.used_buf_states.tail = -1; +} + +static void gve_rx_reset_ring_dqo(struct gve_priv *priv, int idx) +{ + struct gve_rx_ring *rx = &priv->rx[idx]; + size_t size; + int i; + + const u32 buffer_queue_slots = priv->rx_desc_cnt; + const u32 completion_queue_slots = priv->rx_desc_cnt; + + /* Reset buffer queue */ + if (rx->dqo.bufq.desc_ring) { + size = sizeof(rx->dqo.bufq.desc_ring[0]) * + buffer_queue_slots; + memset(rx->dqo.bufq.desc_ring, 0, size); + } + + /* Reset completion queue */ + if (rx->dqo.complq.desc_ring) { + size = sizeof(rx->dqo.complq.desc_ring[0]) * + completion_queue_slots; + memset(rx->dqo.complq.desc_ring, 0, size); + } + + /* Reset q_resources */ + if (rx->q_resources) + memset(rx->q_resources, 0, sizeof(*rx->q_resources)); + + /* Reset buf states */ + if (rx->dqo.buf_states) { + for (i = 0; i < rx->dqo.num_buf_states; i++) { + struct gve_rx_buf_state_dqo *bs = &rx->dqo.buf_states[i]; + + if (bs->page_info.page) + gve_free_page_dqo(priv, bs, !rx->dqo.qpl); + } + } + + gve_rx_init_ring_state_dqo(rx, buffer_queue_slots, + completion_queue_slots); +} + void gve_rx_stop_ring_dqo(struct gve_priv *priv, int idx) { int ntfy_idx = gve_rx_idx_to_ntfy(priv, idx); @@ -220,6 +296,7 @@ void gve_rx_stop_ring_dqo(struct gve_priv *priv, int idx) gve_remove_napi(priv, ntfy_idx); gve_rx_remove_from_block(priv, idx); + gve_rx_reset_ring_dqo(priv, idx); } static void gve_rx_free_ring_dqo(struct gve_priv *priv, struct gve_rx_ring *rx, @@ -273,10 +350,10 @@ static void gve_rx_free_ring_dqo(struct gve_priv *priv, struct gve_rx_ring *rx, netif_dbg(priv, drv, priv->dev, "freed rx ring %d\n", idx); } -static int gve_rx_alloc_hdr_bufs(struct gve_priv *priv, struct gve_rx_ring *rx) +static int gve_rx_alloc_hdr_bufs(struct gve_priv *priv, struct gve_rx_ring *rx, + const u32 buf_count) { struct device *hdev = &priv->pdev->dev; - int buf_count = rx->dqo.bufq.mask + 1; rx->dqo.hdr_bufs.data = dma_alloc_coherent(hdev, priv->header_buf_size * buf_count, &rx->dqo.hdr_bufs.addr, GFP_KERNEL); @@ -301,7 +378,6 @@ static int gve_rx_alloc_ring_dqo(struct gve_priv *priv, { struct device *hdev = &priv->pdev->dev; size_t size; - int i; const u32 buffer_queue_slots = cfg->ring_size; const u32 completion_queue_slots = cfg->ring_size; @@ -311,11 +387,6 @@ static int gve_rx_alloc_ring_dqo(struct gve_priv *priv, memset(rx, 0, sizeof(*rx)); rx->gve = priv; rx->q_num = idx; - rx->dqo.bufq.mask = buffer_queue_slots - 1; - rx->dqo.complq.num_free_slots = completion_queue_slots; - rx->dqo.complq.mask = completion_queue_slots - 1; - rx->ctx.skb_head = NULL; - rx->ctx.skb_tail = NULL; rx->dqo.num_buf_states = cfg->raw_addressing ? min_t(s16, S16_MAX, buffer_queue_slots * 4) : @@ -328,19 +399,9 @@ static int gve_rx_alloc_ring_dqo(struct gve_priv *priv, /* Allocate header buffers for header-split */ if (cfg->enable_header_split) - if (gve_rx_alloc_hdr_bufs(priv, rx)) + if (gve_rx_alloc_hdr_bufs(priv, rx, buffer_queue_slots)) goto err; - /* Set up linked list of buffer IDs */ - for (i = 0; i < rx->dqo.num_buf_states - 1; i++) - rx->dqo.buf_states[i].next = i + 1; - - rx->dqo.buf_states[rx->dqo.num_buf_states - 1].next = -1; - rx->dqo.recycled_buf_states.head = -1; - rx->dqo.recycled_buf_states.tail = -1; - rx->dqo.used_buf_states.head = -1; - rx->dqo.used_buf_states.tail = -1; - /* Allocate RX completion queue */ size = sizeof(rx->dqo.complq.desc_ring[0]) * completion_queue_slots; @@ -368,6 +429,9 @@ static int gve_rx_alloc_ring_dqo(struct gve_priv *priv, if (!rx->q_resources) goto err; + gve_rx_init_ring_state_dqo(rx, buffer_queue_slots, + completion_queue_slots); + return 0; err: -- cgit v1.2.3