| /* |
| * This file is part of the Chelsio T4 Ethernet driver for Linux. |
| * |
| * Copyright (c) 2003-2010 Chelsio Communications, Inc. All rights reserved. |
| * |
| * This software is available to you under a choice of one of two |
| * licenses. You may choose to be licensed under the terms of the GNU |
| * General Public License (GPL) Version 2, available from the file |
| * COPYING in the main directory of this source tree, or the |
| * OpenIB.org BSD license below: |
| * |
| * Redistribution and use in source and binary forms, with or |
| * without modification, are permitted provided that the following |
| * conditions are met: |
| * |
| * - Redistributions of source code must retain the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer. |
| * |
| * - Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer in the documentation and/or other materials |
| * provided with the distribution. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
| * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
| * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| * SOFTWARE. |
| */ |
| |
| #include <linux/skbuff.h> |
| #include <linux/netdevice.h> |
| #include <linux/etherdevice.h> |
| #include <linux/if_vlan.h> |
| #include <linux/ip.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/jiffies.h> |
| #include <net/ipv6.h> |
| #include <net/tcp.h> |
| #include "cxgb4.h" |
| #include "t4_regs.h" |
| #include "t4_msg.h" |
| #include "t4fw_api.h" |
| |
| /* |
| * Rx buffer size. We use largish buffers if possible but settle for single |
| * pages under memory shortage. |
| */ |
| #if PAGE_SHIFT >= 16 |
| # define FL_PG_ORDER 0 |
| #else |
| # define FL_PG_ORDER (16 - PAGE_SHIFT) |
| #endif |
| |
| /* RX_PULL_LEN should be <= RX_COPY_THRES */ |
| #define RX_COPY_THRES 256 |
| #define RX_PULL_LEN 128 |
| |
| /* |
| * Main body length for sk_buffs used for Rx Ethernet packets with fragments. |
| * Should be >= RX_PULL_LEN but possibly bigger to give pskb_may_pull some room. |
| */ |
| #define RX_PKT_SKB_LEN 512 |
| |
| /* Ethernet header padding prepended to RX_PKTs */ |
| #define RX_PKT_PAD 2 |
| |
| /* |
| * Max number of Tx descriptors we clean up at a time. Should be modest as |
| * freeing skbs isn't cheap and it happens while holding locks. We just need |
| * to free packets faster than they arrive, we eventually catch up and keep |
| * the amortized cost reasonable. Must be >= 2 * TXQ_STOP_THRES. |
| */ |
| #define MAX_TX_RECLAIM 16 |
| |
| /* |
| * Max number of Rx buffers we replenish at a time. Again keep this modest, |
| * allocating buffers isn't cheap either. |
| */ |
| #define MAX_RX_REFILL 16U |
| |
| /* |
| * Period of the Rx queue check timer. This timer is infrequent as it has |
| * something to do only when the system experiences severe memory shortage. |
| */ |
| #define RX_QCHECK_PERIOD (HZ / 2) |
| |
| /* |
| * Period of the Tx queue check timer. |
| */ |
| #define TX_QCHECK_PERIOD (HZ / 2) |
| |
| /* |
| * Max number of Tx descriptors to be reclaimed by the Tx timer. |
| */ |
| #define MAX_TIMER_TX_RECLAIM 100 |
| |
| /* |
| * Timer index used when backing off due to memory shortage. |
| */ |
| #define NOMEM_TMR_IDX (SGE_NTIMERS - 1) |
| |
| /* |
| * An FL with <= FL_STARVE_THRES buffers is starving and a periodic timer will |
| * attempt to refill it. |
| */ |
| #define FL_STARVE_THRES 4 |
| |
| /* |
| * Suspend an Ethernet Tx queue with fewer available descriptors than this. |
| * This is the same as calc_tx_descs() for a TSO packet with |
| * nr_frags == MAX_SKB_FRAGS. |
| */ |
| #define ETHTXQ_STOP_THRES \ |
| (1 + DIV_ROUND_UP((3 * MAX_SKB_FRAGS) / 2 + (MAX_SKB_FRAGS & 1), 8)) |
| |
| /* |
| * Suspension threshold for non-Ethernet Tx queues. We require enough room |
| * for a full sized WR. |
| */ |
| #define TXQ_STOP_THRES (SGE_MAX_WR_LEN / sizeof(struct tx_desc)) |
| |
| /* |
| * Max Tx descriptor space we allow for an Ethernet packet to be inlined |
| * into a WR. |
| */ |
| #define MAX_IMM_TX_PKT_LEN 128 |
| |
| /* |
| * Max size of a WR sent through a control Tx queue. |
| */ |
| #define MAX_CTRL_WR_LEN SGE_MAX_WR_LEN |
| |
| enum { |
| /* packet alignment in FL buffers */ |
| FL_ALIGN = L1_CACHE_BYTES < 32 ? 32 : L1_CACHE_BYTES, |
| /* egress status entry size */ |
| STAT_LEN = L1_CACHE_BYTES > 64 ? 128 : 64 |
| }; |
| |
| struct tx_sw_desc { /* SW state per Tx descriptor */ |
| struct sk_buff *skb; |
| struct ulptx_sgl *sgl; |
| }; |
| |
| struct rx_sw_desc { /* SW state per Rx descriptor */ |
| struct page *page; |
| dma_addr_t dma_addr; |
| }; |
| |
| /* |
| * The low bits of rx_sw_desc.dma_addr have special meaning. |
| */ |
| enum { |
| RX_LARGE_BUF = 1 << 0, /* buffer is larger than PAGE_SIZE */ |
| RX_UNMAPPED_BUF = 1 << 1, /* buffer is not mapped */ |
| }; |
| |
| static inline dma_addr_t get_buf_addr(const struct rx_sw_desc *d) |
| { |
| return d->dma_addr & ~(dma_addr_t)(RX_LARGE_BUF | RX_UNMAPPED_BUF); |
| } |
| |
| static inline bool is_buf_mapped(const struct rx_sw_desc *d) |
| { |
| return !(d->dma_addr & RX_UNMAPPED_BUF); |
| } |
| |
| /** |
| * txq_avail - return the number of available slots in a Tx queue |
| * @q: the Tx queue |
| * |
| * Returns the number of descriptors in a Tx queue available to write new |
| * packets. |
| */ |
| static inline unsigned int txq_avail(const struct sge_txq *q) |
| { |
| return q->size - 1 - q->in_use; |
| } |
| |
| /** |
| * fl_cap - return the capacity of a free-buffer list |
| * @fl: the FL |
| * |
| * Returns the capacity of a free-buffer list. The capacity is less than |
| * the size because one descriptor needs to be left unpopulated, otherwise |
| * HW will think the FL is empty. |
| */ |
| static inline unsigned int fl_cap(const struct sge_fl *fl) |
| { |
| return fl->size - 8; /* 1 descriptor = 8 buffers */ |
| } |
| |
| static inline bool fl_starving(const struct sge_fl *fl) |
| { |
| return fl->avail - fl->pend_cred <= FL_STARVE_THRES; |
| } |
| |
| static int map_skb(struct device *dev, const struct sk_buff *skb, |
| dma_addr_t *addr) |
| { |
| const skb_frag_t *fp, *end; |
| const struct skb_shared_info *si; |
| |
| *addr = dma_map_single(dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE); |
| if (dma_mapping_error(dev, *addr)) |
| goto out_err; |
| |
| si = skb_shinfo(skb); |
| end = &si->frags[si->nr_frags]; |
| |
| for (fp = si->frags; fp < end; fp++) { |
| *++addr = dma_map_page(dev, fp->page, fp->page_offset, fp->size, |
| DMA_TO_DEVICE); |
| if (dma_mapping_error(dev, *addr)) |
| goto unwind; |
| } |
| return 0; |
| |
| unwind: |
| while (fp-- > si->frags) |
| dma_unmap_page(dev, *--addr, fp->size, DMA_TO_DEVICE); |
| |
| dma_unmap_single(dev, addr[-1], skb_headlen(skb), DMA_TO_DEVICE); |
| out_err: |
| return -ENOMEM; |
| } |
| |
| #ifdef CONFIG_NEED_DMA_MAP_STATE |
| static void unmap_skb(struct device *dev, const struct sk_buff *skb, |
| const dma_addr_t *addr) |
| { |
| const skb_frag_t *fp, *end; |
| const struct skb_shared_info *si; |
| |
| dma_unmap_single(dev, *addr++, skb_headlen(skb), DMA_TO_DEVICE); |
| |
| si = skb_shinfo(skb); |
| end = &si->frags[si->nr_frags]; |
| for (fp = si->frags; fp < end; fp++) |
| dma_unmap_page(dev, *addr++, fp->size, DMA_TO_DEVICE); |
| } |
| |
| /** |
| * deferred_unmap_destructor - unmap a packet when it is freed |
| * @skb: the packet |
| * |
| * This is the packet destructor used for Tx packets that need to remain |
| * mapped until they are freed rather than until their Tx descriptors are |
| * freed. |
| */ |
| static void deferred_unmap_destructor(struct sk_buff *skb) |
| { |
| unmap_skb(skb->dev->dev.parent, skb, (dma_addr_t *)skb->head); |
| } |
| #endif |
| |
| static void unmap_sgl(struct device *dev, const struct sk_buff *skb, |
| const struct ulptx_sgl *sgl, const struct sge_txq *q) |
| { |
| const struct ulptx_sge_pair *p; |
| unsigned int nfrags = skb_shinfo(skb)->nr_frags; |
| |
| if (likely(skb_headlen(skb))) |
| dma_unmap_single(dev, be64_to_cpu(sgl->addr0), ntohl(sgl->len0), |
| DMA_TO_DEVICE); |
| else { |
| dma_unmap_page(dev, be64_to_cpu(sgl->addr0), ntohl(sgl->len0), |
| DMA_TO_DEVICE); |
| nfrags--; |
| } |
| |
| /* |
| * the complexity below is because of the possibility of a wrap-around |
| * in the middle of an SGL |
| */ |
| for (p = sgl->sge; nfrags >= 2; nfrags -= 2) { |
| if (likely((u8 *)(p + 1) <= (u8 *)q->stat)) { |
| unmap: dma_unmap_page(dev, be64_to_cpu(p->addr[0]), |
| ntohl(p->len[0]), DMA_TO_DEVICE); |
| dma_unmap_page(dev, be64_to_cpu(p->addr[1]), |
| ntohl(p->len[1]), DMA_TO_DEVICE); |
| p++; |
| } else if ((u8 *)p == (u8 *)q->stat) { |
| p = (const struct ulptx_sge_pair *)q->desc; |
| goto unmap; |
| } else if ((u8 *)p + 8 == (u8 *)q->stat) { |
| const __be64 *addr = (const __be64 *)q->desc; |
| |
| dma_unmap_page(dev, be64_to_cpu(addr[0]), |
| ntohl(p->len[0]), DMA_TO_DEVICE); |
| dma_unmap_page(dev, be64_to_cpu(addr[1]), |
| ntohl(p->len[1]), DMA_TO_DEVICE); |
| p = (const struct ulptx_sge_pair *)&addr[2]; |
| } else { |
| const __be64 *addr = (const __be64 *)q->desc; |
| |
| dma_unmap_page(dev, be64_to_cpu(p->addr[0]), |
| ntohl(p->len[0]), DMA_TO_DEVICE); |
| dma_unmap_page(dev, be64_to_cpu(addr[0]), |
| ntohl(p->len[1]), DMA_TO_DEVICE); |
| p = (const struct ulptx_sge_pair *)&addr[1]; |
| } |
| } |
| if (nfrags) { |
| __be64 addr; |
| |
| if ((u8 *)p == (u8 *)q->stat) |
| p = (const struct ulptx_sge_pair *)q->desc; |
| addr = (u8 *)p + 16 <= (u8 *)q->stat ? p->addr[0] : |
| *(const __be64 *)q->desc; |
| dma_unmap_page(dev, be64_to_cpu(addr), ntohl(p->len[0]), |
| DMA_TO_DEVICE); |
| } |
| } |
| |
| /** |
| * free_tx_desc - reclaims Tx descriptors and their buffers |
| * @adapter: the adapter |
| * @q: the Tx queue to reclaim descriptors from |
| * @n: the number of descriptors to reclaim |
| * @unmap: whether the buffers should be unmapped for DMA |
| * |
| * Reclaims Tx descriptors from an SGE Tx queue and frees the associated |
| * Tx buffers. Called with the Tx queue lock held. |
| */ |
| static void free_tx_desc(struct adapter *adap, struct sge_txq *q, |
| unsigned int n, bool unmap) |
| { |
| struct tx_sw_desc *d; |
| unsigned int cidx = q->cidx; |
| struct device *dev = adap->pdev_dev; |
| |
| d = &q->sdesc[cidx]; |
| while (n--) { |
| if (d->skb) { /* an SGL is present */ |
| if (unmap) |
| unmap_sgl(dev, d->skb, d->sgl, q); |
| kfree_skb(d->skb); |
| d->skb = NULL; |
| } |
| ++d; |
| if (++cidx == q->size) { |
| cidx = 0; |
| d = q->sdesc; |
| } |
| } |
| q->cidx = cidx; |
| } |
| |
| /* |
| * Return the number of reclaimable descriptors in a Tx queue. |
| */ |
| static inline int reclaimable(const struct sge_txq *q) |
| { |
| int hw_cidx = ntohs(q->stat->cidx); |
| hw_cidx -= q->cidx; |
| return hw_cidx < 0 ? hw_cidx + q->size : hw_cidx; |
| } |
| |
| /** |
| * reclaim_completed_tx - reclaims completed Tx descriptors |
| * @adap: the adapter |
| * @q: the Tx queue to reclaim completed descriptors from |
| * @unmap: whether the buffers should be unmapped for DMA |
| * |
| * Reclaims Tx descriptors that the SGE has indicated it has processed, |
| * and frees the associated buffers if possible. Called with the Tx |
| * queue locked. |
| */ |
| static inline void reclaim_completed_tx(struct adapter *adap, struct sge_txq *q, |
| bool unmap) |
| { |
| int avail = reclaimable(q); |
| |
| if (avail) { |
| /* |
| * Limit the amount of clean up work we do at a time to keep |
| * the Tx lock hold time O(1). |
| */ |
| if (avail > MAX_TX_RECLAIM) |
| avail = MAX_TX_RECLAIM; |
| |
| free_tx_desc(adap, q, avail, unmap); |
| q->in_use -= avail; |
| } |
| } |
| |
| static inline int get_buf_size(const struct rx_sw_desc *d) |
| { |
| #if FL_PG_ORDER > 0 |
| return (d->dma_addr & RX_LARGE_BUF) ? (PAGE_SIZE << FL_PG_ORDER) : |
| PAGE_SIZE; |
| #else |
| return PAGE_SIZE; |
| #endif |
| } |
| |
| /** |
| * free_rx_bufs - free the Rx buffers on an SGE free list |
| * @adap: the adapter |
| * @q: the SGE free list to free buffers from |
| * @n: how many buffers to free |
| * |
| * Release the next @n buffers on an SGE free-buffer Rx queue. The |
| * buffers must be made inaccessible to HW before calling this function. |
| */ |
| static void free_rx_bufs(struct adapter *adap, struct sge_fl *q, int n) |
| { |
| while (n--) { |
| struct rx_sw_desc *d = &q->sdesc[q->cidx]; |
| |
| if (is_buf_mapped(d)) |
| dma_unmap_page(adap->pdev_dev, get_buf_addr(d), |
| get_buf_size(d), PCI_DMA_FROMDEVICE); |
| put_page(d->page); |
| d->page = NULL; |
| if (++q->cidx == q->size) |
| q->cidx = 0; |
| q->avail--; |
| } |
| } |
| |
| /** |
| * unmap_rx_buf - unmap the current Rx buffer on an SGE free list |
| * @adap: the adapter |
| * @q: the SGE free list |
| * |
| * Unmap the current buffer on an SGE free-buffer Rx queue. The |
| * buffer must be made inaccessible to HW before calling this function. |
| * |
| * This is similar to @free_rx_bufs above but does not free the buffer. |
| * Do note that the FL still loses any further access to the buffer. |
| */ |
| static void unmap_rx_buf(struct adapter *adap, struct sge_fl *q) |
| { |
| struct rx_sw_desc *d = &q->sdesc[q->cidx]; |
| |
| if (is_buf_mapped(d)) |
| dma_unmap_page(adap->pdev_dev, get_buf_addr(d), |
| get_buf_size(d), PCI_DMA_FROMDEVICE); |
| d->page = NULL; |
| if (++q->cidx == q->size) |
| q->cidx = 0; |
| q->avail--; |
| } |
| |
| static inline void ring_fl_db(struct adapter *adap, struct sge_fl *q) |
| { |
| if (q->pend_cred >= 8) { |
| wmb(); |
| t4_write_reg(adap, MYPF_REG(SGE_PF_KDOORBELL), DBPRIO | |
| QID(q->cntxt_id) | PIDX(q->pend_cred / 8)); |
| q->pend_cred &= 7; |
| } |
| } |
| |
| static inline void set_rx_sw_desc(struct rx_sw_desc *sd, struct page *pg, |
| dma_addr_t mapping) |
| { |
| sd->page = pg; |
| sd->dma_addr = mapping; /* includes size low bits */ |
| } |
| |
| /** |
| * refill_fl - refill an SGE Rx buffer ring |
| * @adap: the adapter |
| * @q: the ring to refill |
| * @n: the number of new buffers to allocate |
| * @gfp: the gfp flags for the allocations |
| * |
| * (Re)populate an SGE free-buffer queue with up to @n new packet buffers, |
| * allocated with the supplied gfp flags. The caller must assure that |
| * @n does not exceed the queue's capacity. If afterwards the queue is |
| * found critically low mark it as starving in the bitmap of starving FLs. |
| * |
| * Returns the number of buffers allocated. |
| */ |
| static unsigned int refill_fl(struct adapter *adap, struct sge_fl *q, int n, |
| gfp_t gfp) |
| { |
| struct page *pg; |
| dma_addr_t mapping; |
| unsigned int cred = q->avail; |
| __be64 *d = &q->desc[q->pidx]; |
| struct rx_sw_desc *sd = &q->sdesc[q->pidx]; |
| |
| gfp |= __GFP_NOWARN; /* failures are expected */ |
| |
| #if FL_PG_ORDER > 0 |
| /* |
| * Prefer large buffers |
| */ |
| while (n) { |
| pg = alloc_pages(gfp | __GFP_COMP, FL_PG_ORDER); |
| if (unlikely(!pg)) { |
| q->large_alloc_failed++; |
| break; /* fall back to single pages */ |
| } |
| |
| mapping = dma_map_page(adap->pdev_dev, pg, 0, |
| PAGE_SIZE << FL_PG_ORDER, |
| PCI_DMA_FROMDEVICE); |
| if (unlikely(dma_mapping_error(adap->pdev_dev, mapping))) { |
| __free_pages(pg, FL_PG_ORDER); |
| goto out; /* do not try small pages for this error */ |
| } |
| mapping |= RX_LARGE_BUF; |
| *d++ = cpu_to_be64(mapping); |
| |
| set_rx_sw_desc(sd, pg, mapping); |
| sd++; |
| |
| q->avail++; |
| if (++q->pidx == q->size) { |
| q->pidx = 0; |
| sd = q->sdesc; |
| d = q->desc; |
| } |
| n--; |
| } |
| #endif |
| |
| while (n--) { |
| pg = __netdev_alloc_page(adap->port[0], gfp); |
| if (unlikely(!pg)) { |
| q->alloc_failed++; |
| break; |
| } |
| |
| mapping = dma_map_page(adap->pdev_dev, pg, 0, PAGE_SIZE, |
| PCI_DMA_FROMDEVICE); |
| if (unlikely(dma_mapping_error(adap->pdev_dev, mapping))) { |
| netdev_free_page(adap->port[0], pg); |
| goto out; |
| } |
| *d++ = cpu_to_be64(mapping); |
| |
| set_rx_sw_desc(sd, pg, mapping); |
| sd++; |
| |
| q->avail++; |
| if (++q->pidx == q->size) { |
| q->pidx = 0; |
| sd = q->sdesc; |
| d = q->desc; |
| } |
| } |
| |
| out: cred = q->avail - cred; |
| q->pend_cred += cred; |
| ring_fl_db(adap, q); |
| |
| if (unlikely(fl_starving(q))) { |
| smp_wmb(); |
| set_bit(q->cntxt_id - adap->sge.egr_start, |
| adap->sge.starving_fl); |
| } |
| |
| return cred; |
| } |
| |
| static inline void __refill_fl(struct adapter *adap, struct sge_fl *fl) |
| { |
| refill_fl(adap, fl, min(MAX_RX_REFILL, fl_cap(fl) - fl->avail), |
| GFP_ATOMIC); |
| } |
| |
| /** |
| * alloc_ring - allocate resources for an SGE descriptor ring |
| * @dev: the PCI device's core device |
| * @nelem: the number of descriptors |
| * @elem_size: the size of each descriptor |
| * @sw_size: the size of the SW state associated with each ring element |
| * @phys: the physical address of the allocated ring |
| * @metadata: address of the array holding the SW state for the ring |
| * @stat_size: extra space in HW ring for status information |
| * |
| * Allocates resources for an SGE descriptor ring, such as Tx queues, |
| * free buffer lists, or response queues. Each SGE ring requires |
| * space for its HW descriptors plus, optionally, space for the SW state |
| * associated with each HW entry (the metadata). The function returns |
| * three values: the virtual address for the HW ring (the return value |
| * of the function), the bus address of the HW ring, and the address |
| * of the SW ring. |
| */ |
| static void *alloc_ring(struct device *dev, size_t nelem, size_t elem_size, |
| size_t sw_size, dma_addr_t *phys, void *metadata, |
| size_t stat_size) |
| { |
| size_t len = nelem * elem_size + stat_size; |
| void *s = NULL; |
| void *p = dma_alloc_coherent(dev, len, phys, GFP_KERNEL); |
| |
| if (!p) |
| return NULL; |
| if (sw_size) { |
| s = kcalloc(nelem, sw_size, GFP_KERNEL); |
| |
| if (!s) { |
| dma_free_coherent(dev, len, p, *phys); |
| return NULL; |
| } |
| } |
| if (metadata) |
| *(void **)metadata = s; |
| memset(p, 0, len); |
| return p; |
| } |
| |
| /** |
| * sgl_len - calculates the size of an SGL of the given capacity |
| * @n: the number of SGL entries |
| * |
| * Calculates the number of flits needed for a scatter/gather list that |
| * can hold the given number of entries. |
| */ |
| static inline unsigned int sgl_len(unsigned int n) |
| { |
| n--; |
| return (3 * n) / 2 + (n & 1) + 2; |
| } |
| |
| /** |
| * flits_to_desc - returns the num of Tx descriptors for the given flits |
| * @n: the number of flits |
| * |
| * Returns the number of Tx descriptors needed for the supplied number |
| * of flits. |
| */ |
| static inline unsigned int flits_to_desc(unsigned int n) |
| { |
| BUG_ON(n > SGE_MAX_WR_LEN / 8); |
| return DIV_ROUND_UP(n, 8); |
| } |
| |
| /** |
| * is_eth_imm - can an Ethernet packet be sent as immediate data? |
| * @skb: the packet |
| * |
| * Returns whether an Ethernet packet is small enough to fit as |
| * immediate data. |
| */ |
| static inline int is_eth_imm(const struct sk_buff *skb) |
| { |
| return skb->len <= MAX_IMM_TX_PKT_LEN - sizeof(struct cpl_tx_pkt); |
| } |
| |
| /** |
| * calc_tx_flits - calculate the number of flits for a packet Tx WR |
| * @skb: the packet |
| * |
| * Returns the number of flits needed for a Tx WR for the given Ethernet |
| * packet, including the needed WR and CPL headers. |
| */ |
| static inline unsigned int calc_tx_flits(const struct sk_buff *skb) |
| { |
| unsigned int flits; |
| |
| if (is_eth_imm(skb)) |
| return DIV_ROUND_UP(skb->len + sizeof(struct cpl_tx_pkt), 8); |
| |
| flits = sgl_len(skb_shinfo(skb)->nr_frags + 1) + 4; |
| if (skb_shinfo(skb)->gso_size) |
| flits += 2; |
| return flits; |
| } |
| |
| /** |
| * calc_tx_descs - calculate the number of Tx descriptors for a packet |
| * @skb: the packet |
| * |
| * Returns the number of Tx descriptors needed for the given Ethernet |
| * packet, including the needed WR and CPL headers. |
| */ |
| static inline unsigned int calc_tx_descs(const struct sk_buff *skb) |
| { |
| return flits_to_desc(calc_tx_flits(skb)); |
| } |
| |
| /** |
| * write_sgl - populate a scatter/gather list for a packet |
| * @skb: the packet |
| * @q: the Tx queue we are writing into |
| * @sgl: starting location for writing the SGL |
| * @end: points right after the end of the SGL |
| * @start: start offset into skb main-body data to include in the SGL |
| * @addr: the list of bus addresses for the SGL elements |
| * |
| * Generates a gather list for the buffers that make up a packet. |
| * The caller must provide adequate space for the SGL that will be written. |
| * The SGL includes all of the packet's page fragments and the data in its |
| * main body except for the first @start bytes. @sgl must be 16-byte |
| * aligned and within a Tx descriptor with available space. @end points |
| * right after the end of the SGL but does not account for any potential |
| * wrap around, i.e., @end > @sgl. |
| */ |
| static void write_sgl(const struct sk_buff *skb, struct sge_txq *q, |
| struct ulptx_sgl *sgl, u64 *end, unsigned int start, |
| const dma_addr_t *addr) |
| { |
| unsigned int i, len; |
| struct ulptx_sge_pair *to; |
| const struct skb_shared_info *si = skb_shinfo(skb); |
| unsigned int nfrags = si->nr_frags; |
| struct ulptx_sge_pair buf[MAX_SKB_FRAGS / 2 + 1]; |
| |
| len = skb_headlen(skb) - start; |
| if (likely(len)) { |
| sgl->len0 = htonl(len); |
| sgl->addr0 = cpu_to_be64(addr[0] + start); |
| nfrags++; |
| } else { |
| sgl->len0 = htonl(si->frags[0].size); |
| sgl->addr0 = cpu_to_be64(addr[1]); |
| } |
| |
| sgl->cmd_nsge = htonl(ULPTX_CMD(ULP_TX_SC_DSGL) | ULPTX_NSGE(nfrags)); |
| if (likely(--nfrags == 0)) |
| return; |
| /* |
| * Most of the complexity below deals with the possibility we hit the |
| * end of the queue in the middle of writing the SGL. For this case |
| * only we create the SGL in a temporary buffer and then copy it. |
| */ |
| to = (u8 *)end > (u8 *)q->stat ? buf : sgl->sge; |
| |
| for (i = (nfrags != si->nr_frags); nfrags >= 2; nfrags -= 2, to++) { |
| to->len[0] = cpu_to_be32(si->frags[i].size); |
| to->len[1] = cpu_to_be32(si->frags[++i].size); |
| to->addr[0] = cpu_to_be64(addr[i]); |
| to->addr[1] = cpu_to_be64(addr[++i]); |
| } |
| if (nfrags) { |
| to->len[0] = cpu_to_be32(si->frags[i].size); |
| to->len[1] = cpu_to_be32(0); |
| to->addr[0] = cpu_to_be64(addr[i + 1]); |
| } |
| if (unlikely((u8 *)end > (u8 *)q->stat)) { |
| unsigned int part0 = (u8 *)q->stat - (u8 *)sgl->sge, part1; |
| |
| if (likely(part0)) |
| memcpy(sgl->sge, buf, part0); |
| part1 = (u8 *)end - (u8 *)q->stat; |
| memcpy(q->desc, (u8 *)buf + part0, part1); |
| end = (void *)q->desc + part1; |
| } |
| if ((uintptr_t)end & 8) /* 0-pad to multiple of 16 */ |
| *(u64 *)end = 0; |
| } |
| |
| /** |
| * ring_tx_db - check and potentially ring a Tx queue's doorbell |
| * @adap: the adapter |
| * @q: the Tx queue |
| * @n: number of new descriptors to give to HW |
| * |
| * Ring the doorbel for a Tx queue. |
| */ |
| static inline void ring_tx_db(struct adapter *adap, struct sge_txq *q, int n) |
| { |
| wmb(); /* write descriptors before telling HW */ |
| t4_write_reg(adap, MYPF_REG(SGE_PF_KDOORBELL), |
| QID(q->cntxt_id) | PIDX(n)); |
| } |
| |
| /** |
| * inline_tx_skb - inline a packet's data into Tx descriptors |
| * @skb: the packet |
| * @q: the Tx queue where the packet will be inlined |
| * @pos: starting position in the Tx queue where to inline the packet |
| * |
| * Inline a packet's contents directly into Tx descriptors, starting at |
| * the given position within the Tx DMA ring. |
| * Most of the complexity of this operation is dealing with wrap arounds |
| * in the middle of the packet we want to inline. |
| */ |
| static void inline_tx_skb(const struct sk_buff *skb, const struct sge_txq *q, |
| void *pos) |
| { |
| u64 *p; |
| int left = (void *)q->stat - pos; |
| |
| if (likely(skb->len <= left)) { |
| if (likely(!skb->data_len)) |
| skb_copy_from_linear_data(skb, pos, skb->len); |
| else |
| skb_copy_bits(skb, 0, pos, skb->len); |
| pos += skb->len; |
| } else { |
| skb_copy_bits(skb, 0, pos, left); |
| skb_copy_bits(skb, left, q->desc, skb->len - left); |
| pos = (void *)q->desc + (skb->len - left); |
| } |
| |
| /* 0-pad to multiple of 16 */ |
| p = PTR_ALIGN(pos, 8); |
| if ((uintptr_t)p & 8) |
| *p = 0; |
| } |
| |
| /* |
| * Figure out what HW csum a packet wants and return the appropriate control |
| * bits. |
| */ |
| static u64 hwcsum(const struct sk_buff *skb) |
| { |
| int csum_type; |
| const struct iphdr *iph = ip_hdr(skb); |
| |
| if (iph->version == 4) { |
| if (iph->protocol == IPPROTO_TCP) |
| csum_type = TX_CSUM_TCPIP; |
| else if (iph->protocol == IPPROTO_UDP) |
| csum_type = TX_CSUM_UDPIP; |
| else { |
| nocsum: /* |
| * unknown protocol, disable HW csum |
| * and hope a bad packet is detected |
| */ |
| return TXPKT_L4CSUM_DIS; |
| } |
| } else { |
| /* |
| * this doesn't work with extension headers |
| */ |
| const struct ipv6hdr *ip6h = (const struct ipv6hdr *)iph; |
| |
| if (ip6h->nexthdr == IPPROTO_TCP) |
| csum_type = TX_CSUM_TCPIP6; |
| else if (ip6h->nexthdr == IPPROTO_UDP) |
| csum_type = TX_CSUM_UDPIP6; |
| else |
| goto nocsum; |
| } |
| |
| if (likely(csum_type >= TX_CSUM_TCPIP)) |
| return TXPKT_CSUM_TYPE(csum_type) | |
| TXPKT_IPHDR_LEN(skb_network_header_len(skb)) | |
| TXPKT_ETHHDR_LEN(skb_network_offset(skb) - ETH_HLEN); |
| else { |
| int start = skb_transport_offset(skb); |
| |
| return TXPKT_CSUM_TYPE(csum_type) | TXPKT_CSUM_START(start) | |
| TXPKT_CSUM_LOC(start + skb->csum_offset); |
| } |
| } |
| |
| static void eth_txq_stop(struct sge_eth_txq *q) |
| { |
| netif_tx_stop_queue(q->txq); |
| q->q.stops++; |
| } |
| |
| static inline void txq_advance(struct sge_txq *q, unsigned int n) |
| { |
| q->in_use += n; |
| q->pidx += n; |
| if (q->pidx >= q->size) |
| q->pidx -= q->size; |
| } |
| |
| /** |
| * t4_eth_xmit - add a packet to an Ethernet Tx queue |
| * @skb: the packet |
| * @dev: the egress net device |
| * |
| * Add a packet to an SGE Ethernet Tx queue. Runs with softirqs disabled. |
| */ |
| netdev_tx_t t4_eth_xmit(struct sk_buff *skb, struct net_device *dev) |
| { |
| u32 wr_mid; |
| u64 cntrl, *end; |
| int qidx, credits; |
| unsigned int flits, ndesc; |
| struct adapter *adap; |
| struct sge_eth_txq *q; |
| const struct port_info *pi; |
| struct fw_eth_tx_pkt_wr *wr; |
| struct cpl_tx_pkt_core *cpl; |
| const struct skb_shared_info *ssi; |
| dma_addr_t addr[MAX_SKB_FRAGS + 1]; |
| |
| /* |
| * The chip min packet length is 10 octets but play safe and reject |
| * anything shorter than an Ethernet header. |
| */ |
| if (unlikely(skb->len < ETH_HLEN)) { |
| out_free: dev_kfree_skb(skb); |
| return NETDEV_TX_OK; |
| } |
| |
| pi = netdev_priv(dev); |
| adap = pi->adapter; |
| qidx = skb_get_queue_mapping(skb); |
| q = &adap->sge.ethtxq[qidx + pi->first_qset]; |
| |
| reclaim_completed_tx(adap, &q->q, true); |
| |
| flits = calc_tx_flits(skb); |
| ndesc = flits_to_desc(flits); |
| credits = txq_avail(&q->q) - ndesc; |
| |
| if (unlikely(credits < 0)) { |
| eth_txq_stop(q); |
| dev_err(adap->pdev_dev, |
| "%s: Tx ring %u full while queue awake!\n", |
| dev->name, qidx); |
| return NETDEV_TX_BUSY; |
| } |
| |
| if (!is_eth_imm(skb) && |
| unlikely(map_skb(adap->pdev_dev, skb, addr) < 0)) { |
| q->mapping_err++; |
| goto out_free; |
| } |
| |
| wr_mid = FW_WR_LEN16(DIV_ROUND_UP(flits, 2)); |
| if (unlikely(credits < ETHTXQ_STOP_THRES)) { |
| eth_txq_stop(q); |
| wr_mid |= FW_WR_EQUEQ | FW_WR_EQUIQ; |
| } |
| |
| wr = (void *)&q->q.desc[q->q.pidx]; |
| wr->equiq_to_len16 = htonl(wr_mid); |
| wr->r3 = cpu_to_be64(0); |
| end = (u64 *)wr + flits; |
| |
| ssi = skb_shinfo(skb); |
| if (ssi->gso_size) { |
| struct cpl_tx_pkt_lso *lso = (void *)wr; |
| bool v6 = (ssi->gso_type & SKB_GSO_TCPV6) != 0; |
| int l3hdr_len = skb_network_header_len(skb); |
| int eth_xtra_len = skb_network_offset(skb) - ETH_HLEN; |
| |
| wr->op_immdlen = htonl(FW_WR_OP(FW_ETH_TX_PKT_WR) | |
| FW_WR_IMMDLEN(sizeof(*lso))); |
| lso->c.lso_ctrl = htonl(LSO_OPCODE(CPL_TX_PKT_LSO) | |
| LSO_FIRST_SLICE | LSO_LAST_SLICE | |
| LSO_IPV6(v6) | |
| LSO_ETHHDR_LEN(eth_xtra_len / 4) | |
| LSO_IPHDR_LEN(l3hdr_len / 4) | |
| LSO_TCPHDR_LEN(tcp_hdr(skb)->doff)); |
| lso->c.ipid_ofst = htons(0); |
| lso->c.mss = htons(ssi->gso_size); |
| lso->c.seqno_offset = htonl(0); |
| lso->c.len = htonl(skb->len); |
| cpl = (void *)(lso + 1); |
| cntrl = TXPKT_CSUM_TYPE(v6 ? TX_CSUM_TCPIP6 : TX_CSUM_TCPIP) | |
| TXPKT_IPHDR_LEN(l3hdr_len) | |
| TXPKT_ETHHDR_LEN(eth_xtra_len); |
| q->tso++; |
| q->tx_cso += ssi->gso_segs; |
| } else { |
| int len; |
| |
| len = is_eth_imm(skb) ? skb->len + sizeof(*cpl) : sizeof(*cpl); |
| wr->op_immdlen = htonl(FW_WR_OP(FW_ETH_TX_PKT_WR) | |
| FW_WR_IMMDLEN(len)); |
| cpl = (void *)(wr + 1); |
| if (skb->ip_summed == CHECKSUM_PARTIAL) { |
| cntrl = hwcsum(skb) | TXPKT_IPCSUM_DIS; |
| q->tx_cso++; |
| } else |
| cntrl = TXPKT_L4CSUM_DIS | TXPKT_IPCSUM_DIS; |
| } |
| |
| if (vlan_tx_tag_present(skb)) { |
| q->vlan_ins++; |
| cntrl |= TXPKT_VLAN_VLD | TXPKT_VLAN(vlan_tx_tag_get(skb)); |
| } |
| |
| cpl->ctrl0 = htonl(TXPKT_OPCODE(CPL_TX_PKT_XT) | |
| TXPKT_INTF(pi->tx_chan) | TXPKT_PF(adap->fn)); |
| cpl->pack = htons(0); |
| cpl->len = htons(skb->len); |
| cpl->ctrl1 = cpu_to_be64(cntrl); |
| |
| if (is_eth_imm(skb)) { |
| inline_tx_skb(skb, &q->q, cpl + 1); |
| dev_kfree_skb(skb); |
| } else { |
| int last_desc; |
| |
| write_sgl(skb, &q->q, (struct ulptx_sgl *)(cpl + 1), end, 0, |
| addr); |
| skb_orphan(skb); |
| |
| last_desc = q->q.pidx + ndesc - 1; |
| if (last_desc >= q->q.size) |
| last_desc -= q->q.size; |
| q->q.sdesc[last_desc].skb = skb; |
| q->q.sdesc[last_desc].sgl = (struct ulptx_sgl *)(cpl + 1); |
| } |
| |
| txq_advance(&q->q, ndesc); |
| |
| ring_tx_db(adap, &q->q, ndesc); |
| return NETDEV_TX_OK; |
| } |
| |
| /** |
| * reclaim_completed_tx_imm - reclaim completed control-queue Tx descs |
| * @q: the SGE control Tx queue |
| * |
| * This is a variant of reclaim_completed_tx() that is used for Tx queues |
| * that send only immediate data (presently just the control queues) and |
| * thus do not have any sk_buffs to release. |
| */ |
| static inline void reclaim_completed_tx_imm(struct sge_txq *q) |
| { |
| int hw_cidx = ntohs(q->stat->cidx); |
| int reclaim = hw_cidx - q->cidx; |
| |
| if (reclaim < 0) |
| reclaim += q->size; |
| |
| q->in_use -= reclaim; |
| q->cidx = hw_cidx; |
| } |
| |
| /** |
| * is_imm - check whether a packet can be sent as immediate data |
| * @skb: the packet |
| * |
| * Returns true if a packet can be sent as a WR with immediate data. |
| */ |
| static inline int is_imm(const struct sk_buff *skb) |
| { |
| return skb->len <= MAX_CTRL_WR_LEN; |
| } |
| |
| /** |
| * ctrlq_check_stop - check if a control queue is full and should stop |
| * @q: the queue |
| * @wr: most recent WR written to the queue |
| * |
| * Check if a control queue has become full and should be stopped. |
| * We clean up control queue descriptors very lazily, only when we are out. |
| * If the queue is still full after reclaiming any completed descriptors |
| * we suspend it and have the last WR wake it up. |
| */ |
| static void ctrlq_check_stop(struct sge_ctrl_txq *q, struct fw_wr_hdr *wr) |
| { |
| reclaim_completed_tx_imm(&q->q); |
| if (unlikely(txq_avail(&q->q) < TXQ_STOP_THRES)) { |
| wr->lo |= htonl(FW_WR_EQUEQ | FW_WR_EQUIQ); |
| q->q.stops++; |
| q->full = 1; |
| } |
| } |
| |
| /** |
| * ctrl_xmit - send a packet through an SGE control Tx queue |
| * @q: the control queue |
| * @skb: the packet |
| * |
| * Send a packet through an SGE control Tx queue. Packets sent through |
| * a control queue must fit entirely as immediate data. |
| */ |
| static int ctrl_xmit(struct sge_ctrl_txq *q, struct sk_buff *skb) |
| { |
| unsigned int ndesc; |
| struct fw_wr_hdr *wr; |
| |
| if (unlikely(!is_imm(skb))) { |
| WARN_ON(1); |
| dev_kfree_skb(skb); |
| return NET_XMIT_DROP; |
| } |
| |
| ndesc = DIV_ROUND_UP(skb->len, sizeof(struct tx_desc)); |
| spin_lock(&q->sendq.lock); |
| |
| if (unlikely(q->full)) { |
| skb->priority = ndesc; /* save for restart */ |
| __skb_queue_tail(&q->sendq, skb); |
| spin_unlock(&q->sendq.lock); |
| return NET_XMIT_CN; |
| } |
| |
| wr = (struct fw_wr_hdr *)&q->q.desc[q->q.pidx]; |
| inline_tx_skb(skb, &q->q, wr); |
| |
| txq_advance(&q->q, ndesc); |
| if (unlikely(txq_avail(&q->q) < TXQ_STOP_THRES)) |
| ctrlq_check_stop(q, wr); |
| |
| ring_tx_db(q->adap, &q->q, ndesc); |
| spin_unlock(&q->sendq.lock); |
| |
| kfree_skb(skb); |
| return NET_XMIT_SUCCESS; |
| } |
| |
| /** |
| * restart_ctrlq - restart a suspended control queue |
| * @data: the control queue to restart |
| * |
| * Resumes transmission on a suspended Tx control queue. |
| */ |
| static void restart_ctrlq(unsigned long data) |
| { |
| struct sk_buff *skb; |
| unsigned int written = 0; |
| struct sge_ctrl_txq *q = (struct sge_ctrl_txq *)data; |
| |
| spin_lock(&q->sendq.lock); |
| reclaim_completed_tx_imm(&q->q); |
| BUG_ON(txq_avail(&q->q) < TXQ_STOP_THRES); /* q should be empty */ |
| |
| while ((skb = __skb_dequeue(&q->sendq)) != NULL) { |
| struct fw_wr_hdr *wr; |
| unsigned int ndesc = skb->priority; /* previously saved */ |
| |
| /* |
| * Write descriptors and free skbs outside the lock to limit |
| * wait times. q->full is still set so new skbs will be queued. |
| */ |
| spin_unlock(&q->sendq.lock); |
| |
| wr = (struct fw_wr_hdr *)&q->q.desc[q->q.pidx]; |
| inline_tx_skb(skb, &q->q, wr); |
| kfree_skb(skb); |
| |
| written += ndesc; |
| txq_advance(&q->q, ndesc); |
| if (unlikely(txq_avail(&q->q) < TXQ_STOP_THRES)) { |
| unsigned long old = q->q.stops; |
| |
| ctrlq_check_stop(q, wr); |
| if (q->q.stops != old) { /* suspended anew */ |
| spin_lock(&q->sendq.lock); |
| goto ringdb; |
| } |
| } |
| if (written > 16) { |
| ring_tx_db(q->adap, &q->q, written); |
| written = 0; |
| } |
| spin_lock(&q->sendq.lock); |
| } |
| q->full = 0; |
| ringdb: if (written) |
| ring_tx_db(q->adap, &q->q, written); |
| spin_unlock(&q->sendq.lock); |
| } |
| |
| /** |
| * t4_mgmt_tx - send a management message |
| * @adap: the adapter |
| * @skb: the packet containing the management message |
| * |
| * Send a management message through control queue 0. |
| */ |
| int t4_mgmt_tx(struct adapter *adap, struct sk_buff *skb) |
| { |
| int ret; |
| |
| local_bh_disable(); |
| ret = ctrl_xmit(&adap->sge.ctrlq[0], skb); |
| local_bh_enable(); |
| return ret; |
| } |
| |
| /** |
| * is_ofld_imm - check whether a packet can be sent as immediate data |
| * @skb: the packet |
| * |
| * Returns true if a packet can be sent as an offload WR with immediate |
| * data. We currently use the same limit as for Ethernet packets. |
| */ |
| static inline int is_ofld_imm(const struct sk_buff *skb) |
| { |
| return skb->len <= MAX_IMM_TX_PKT_LEN; |
| } |
| |
| /** |
| * calc_tx_flits_ofld - calculate # of flits for an offload packet |
| * @skb: the packet |
| * |
| * Returns the number of flits needed for the given offload packet. |
| * These packets are already fully constructed and no additional headers |
| * will be added. |
| */ |
| static inline unsigned int calc_tx_flits_ofld(const struct sk_buff *skb) |
| { |
| unsigned int flits, cnt; |
| |
| if (is_ofld_imm(skb)) |
| return DIV_ROUND_UP(skb->len, 8); |
| |
| flits = skb_transport_offset(skb) / 8U; /* headers */ |
| cnt = skb_shinfo(skb)->nr_frags; |
| if (skb->tail != skb->transport_header) |
| cnt++; |
| return flits + sgl_len(cnt); |
| } |
| |
| /** |
| * txq_stop_maperr - stop a Tx queue due to I/O MMU exhaustion |
| * @adap: the adapter |
| * @q: the queue to stop |
| * |
| * Mark a Tx queue stopped due to I/O MMU exhaustion and resulting |
| * inability to map packets. A periodic timer attempts to restart |
| * queues so marked. |
| */ |
| static void txq_stop_maperr(struct sge_ofld_txq *q) |
| { |
| q->mapping_err++; |
| q->q.stops++; |
| set_bit(q->q.cntxt_id - q->adap->sge.egr_start, |
| q->adap->sge.txq_maperr); |
| } |
| |
| /** |
| * ofldtxq_stop - stop an offload Tx queue that has become full |
| * @q: the queue to stop |
| * @skb: the packet causing the queue to become full |
| * |
| * Stops an offload Tx queue that has become full and modifies the packet |
| * being written to request a wakeup. |
| */ |
| static void ofldtxq_stop(struct sge_ofld_txq *q, struct sk_buff *skb) |
| { |
| struct fw_wr_hdr *wr = (struct fw_wr_hdr *)skb->data; |
| |
| wr->lo |= htonl(FW_WR_EQUEQ | FW_WR_EQUIQ); |
| q->q.stops++; |
| q->full = 1; |
| } |
| |
| /** |
| * service_ofldq - restart a suspended offload queue |
| * @q: the offload queue |
| * |
| * Services an offload Tx queue by moving packets from its packet queue |
| * to the HW Tx ring. The function starts and ends with the queue locked. |
| */ |
| static void service_ofldq(struct sge_ofld_txq *q) |
| { |
| u64 *pos; |
| int credits; |
| struct sk_buff *skb; |
| unsigned int written = 0; |
| unsigned int flits, ndesc; |
| |
| while ((skb = skb_peek(&q->sendq)) != NULL && !q->full) { |
| /* |
| * We drop the lock but leave skb on sendq, thus retaining |
| * exclusive access to the state of the queue. |
| */ |
| spin_unlock(&q->sendq.lock); |
| |
| reclaim_completed_tx(q->adap, &q->q, false); |
| |
| flits = skb->priority; /* previously saved */ |
| ndesc = flits_to_desc(flits); |
| credits = txq_avail(&q->q) - ndesc; |
| BUG_ON(credits < 0); |
| if (unlikely(credits < TXQ_STOP_THRES)) |
| ofldtxq_stop(q, skb); |
| |
| pos = (u64 *)&q->q.desc[q->q.pidx]; |
| if (is_ofld_imm(skb)) |
| inline_tx_skb(skb, &q->q, pos); |
| else if (map_skb(q->adap->pdev_dev, skb, |
| (dma_addr_t *)skb->head)) { |
| txq_stop_maperr(q); |
| spin_lock(&q->sendq.lock); |
| break; |
| } else { |
| int last_desc, hdr_len = skb_transport_offset(skb); |
| |
| memcpy(pos, skb->data, hdr_len); |
| write_sgl(skb, &q->q, (void *)pos + hdr_len, |
| pos + flits, hdr_len, |
| (dma_addr_t *)skb->head); |
| #ifdef CONFIG_NEED_DMA_MAP_STATE |
| skb->dev = q->adap->port[0]; |
| skb->destructor = deferred_unmap_destructor; |
| #endif |
| last_desc = q->q.pidx + ndesc - 1; |
| if (last_desc >= q->q.size) |
| last_desc -= q->q.size; |
| q->q.sdesc[last_desc].skb = skb; |
| } |
| |
| txq_advance(&q->q, ndesc); |
| written += ndesc; |
| if (unlikely(written > 32)) { |
| ring_tx_db(q->adap, &q->q, written); |
| written = 0; |
| } |
| |
| spin_lock(&q->sendq.lock); |
| __skb_unlink(skb, &q->sendq); |
| if (is_ofld_imm(skb)) |
| kfree_skb(skb); |
| } |
| if (likely(written)) |
| ring_tx_db(q->adap, &q->q, written); |
| } |
| |
| /** |
| * ofld_xmit - send a packet through an offload queue |
| * @q: the Tx offload queue |
| * @skb: the packet |
| * |
| * Send an offload packet through an SGE offload queue. |
| */ |
| static int ofld_xmit(struct sge_ofld_txq *q, struct sk_buff *skb) |
| { |
| skb->priority = calc_tx_flits_ofld(skb); /* save for restart */ |
| spin_lock(&q->sendq.lock); |
| __skb_queue_tail(&q->sendq, skb); |
| if (q->sendq.qlen == 1) |
| service_ofldq(q); |
| spin_unlock(&q->sendq.lock); |
| return NET_XMIT_SUCCESS; |
| } |
| |
| /** |
| * restart_ofldq - restart a suspended offload queue |
| * @data: the offload queue to restart |
| * |
| * Resumes transmission on a suspended Tx offload queue. |
| */ |
| static void restart_ofldq(unsigned long data) |
| { |
| struct sge_ofld_txq *q = (struct sge_ofld_txq *)data; |
| |
| spin_lock(&q->sendq.lock); |
| q->full = 0; /* the queue actually is completely empty now */ |
| service_ofldq(q); |
| spin_unlock(&q->sendq.lock); |
| } |
| |
| /** |
| * skb_txq - return the Tx queue an offload packet should use |
| * @skb: the packet |
| * |
| * Returns the Tx queue an offload packet should use as indicated by bits |
| * 1-15 in the packet's queue_mapping. |
| */ |
| static inline unsigned int skb_txq(const struct sk_buff *skb) |
| { |
| return skb->queue_mapping >> 1; |
| } |
| |
| /** |
| * is_ctrl_pkt - return whether an offload packet is a control packet |
| * @skb: the packet |
| * |
| * Returns whether an offload packet should use an OFLD or a CTRL |
| * Tx queue as indicated by bit 0 in the packet's queue_mapping. |
| */ |
| static inline unsigned int is_ctrl_pkt(const struct sk_buff *skb) |
| { |
| return skb->queue_mapping & 1; |
| } |
| |
| static inline int ofld_send(struct adapter *adap, struct sk_buff *skb) |
| { |
| unsigned int idx = skb_txq(skb); |
| |
| if (unlikely(is_ctrl_pkt(skb))) |
| return ctrl_xmit(&adap->sge.ctrlq[idx], skb); |
| return ofld_xmit(&adap->sge.ofldtxq[idx], skb); |
| } |
| |
| /** |
| * t4_ofld_send - send an offload packet |
| * @adap: the adapter |
| * @skb: the packet |
| * |
| * Sends an offload packet. We use the packet queue_mapping to select the |
| * appropriate Tx queue as follows: bit 0 indicates whether the packet |
| * should be sent as regular or control, bits 1-15 select the queue. |
| */ |
| int t4_ofld_send(struct adapter *adap, struct sk_buff *skb) |
| { |
| int ret; |
| |
| local_bh_disable(); |
| ret = ofld_send(adap, skb); |
| local_bh_enable(); |
| return ret; |
| } |
| |
| /** |
| * cxgb4_ofld_send - send an offload packet |
| * @dev: the net device |
| * @skb: the packet |
| * |
| * Sends an offload packet. This is an exported version of @t4_ofld_send, |
| * intended for ULDs. |
| */ |
| int cxgb4_ofld_send(struct net_device *dev, struct sk_buff *skb) |
| { |
| return t4_ofld_send(netdev2adap(dev), skb); |
| } |
| EXPORT_SYMBOL(cxgb4_ofld_send); |
| |
| static inline void copy_frags(struct skb_shared_info *ssi, |
| const struct pkt_gl *gl, unsigned int offset) |
| { |
| unsigned int n; |
| |
| /* usually there's just one frag */ |
| ssi->frags[0].page = gl->frags[0].page; |
| ssi->frags[0].page_offset = gl->frags[0].page_offset + offset; |
| ssi->frags[0].size = gl->frags[0].size - offset; |
| ssi->nr_frags = gl->nfrags; |
| n = gl->nfrags - 1; |
| if (n) |
| memcpy(&ssi->frags[1], &gl->frags[1], n * sizeof(skb_frag_t)); |
| |
| /* get a reference to the last page, we don't own it */ |
| get_page(gl->frags[n].page); |
| } |
| |
| /** |
| * cxgb4_pktgl_to_skb - build an sk_buff from a packet gather list |
| * @gl: the gather list |
| * @skb_len: size of sk_buff main body if it carries fragments |
| * @pull_len: amount of data to move to the sk_buff's main body |
| * |
| * Builds an sk_buff from the given packet gather list. Returns the |
| * sk_buff or %NULL if sk_buff allocation failed. |
| */ |
| struct sk_buff *cxgb4_pktgl_to_skb(const struct pkt_gl *gl, |
| unsigned int skb_len, unsigned int pull_len) |
| { |
| struct sk_buff *skb; |
| |
| /* |
| * Below we rely on RX_COPY_THRES being less than the smallest Rx buffer |
| * size, which is expected since buffers are at least PAGE_SIZEd. |
| * In this case packets up to RX_COPY_THRES have only one fragment. |
| */ |
| if (gl->tot_len <= RX_COPY_THRES) { |
| skb = dev_alloc_skb(gl->tot_len); |
| if (unlikely(!skb)) |
| goto out; |
| __skb_put(skb, gl->tot_len); |
| skb_copy_to_linear_data(skb, gl->va, gl->tot_len); |
| } else { |
| skb = dev_alloc_skb(skb_len); |
| if (unlikely(!skb)) |
| goto out; |
| __skb_put(skb, pull_len); |
| skb_copy_to_linear_data(skb, gl->va, pull_len); |
| |
| copy_frags(skb_shinfo(skb), gl, pull_len); |
| skb->len = gl->tot_len; |
| skb->data_len = skb->len - pull_len; |
| skb->truesize += skb->data_len; |
| } |
| out: return skb; |
| } |
| EXPORT_SYMBOL(cxgb4_pktgl_to_skb); |
| |
| /** |
| * t4_pktgl_free - free a packet gather list |
| * @gl: the gather list |
| * |
| * Releases the pages of a packet gather list. We do not own the last |
| * page on the list and do not free it. |
| */ |
| static void t4_pktgl_free(const struct pkt_gl *gl) |
| { |
| int n; |
| const skb_frag_t *p; |
| |
| for (p = gl->frags, n = gl->nfrags - 1; n--; p++) |
| put_page(p->page); |
| } |
| |
| /* |
| * Process an MPS trace packet. Give it an unused protocol number so it won't |
| * be delivered to anyone and send it to the stack for capture. |
| */ |
| static noinline int handle_trace_pkt(struct adapter *adap, |
| const struct pkt_gl *gl) |
| { |
| struct sk_buff *skb; |
| struct cpl_trace_pkt *p; |
| |
| skb = cxgb4_pktgl_to_skb(gl, RX_PULL_LEN, RX_PULL_LEN); |
| if (unlikely(!skb)) { |
| t4_pktgl_free(gl); |
| return 0; |
| } |
| |
| p = (struct cpl_trace_pkt *)skb->data; |
| __skb_pull(skb, sizeof(*p)); |
| skb_reset_mac_header(skb); |
| skb->protocol = htons(0xffff); |
| skb->dev = adap->port[0]; |
| netif_receive_skb(skb); |
| return 0; |
| } |
| |
| static void do_gro(struct sge_eth_rxq *rxq, const struct pkt_gl *gl, |
| const struct cpl_rx_pkt *pkt) |
| { |
| int ret; |
| struct sk_buff *skb; |
| |
| skb = napi_get_frags(&rxq->rspq.napi); |
| if (unlikely(!skb)) { |
| t4_pktgl_free(gl); |
| rxq->stats.rx_drops++; |
| return; |
| } |
| |
| copy_frags(skb_shinfo(skb), gl, RX_PKT_PAD); |
| skb->len = gl->tot_len - RX_PKT_PAD; |
| skb->data_len = skb->len; |
| skb->truesize += skb->data_len; |
| skb->ip_summed = CHECKSUM_UNNECESSARY; |
| skb_record_rx_queue(skb, rxq->rspq.idx); |
| if (rxq->rspq.netdev->features & NETIF_F_RXHASH) |
| skb->rxhash = (__force u32)pkt->rsshdr.hash_val; |
| |
| if (unlikely(pkt->vlan_ex)) { |
| struct port_info *pi = netdev_priv(rxq->rspq.netdev); |
| struct vlan_group *grp = pi->vlan_grp; |
| |
| rxq->stats.vlan_ex++; |
| if (likely(grp)) { |
| ret = vlan_gro_frags(&rxq->rspq.napi, grp, |
| ntohs(pkt->vlan)); |
| goto stats; |
| } |
| } |
| ret = napi_gro_frags(&rxq->rspq.napi); |
| stats: if (ret == GRO_HELD) |
| rxq->stats.lro_pkts++; |
| else if (ret == GRO_MERGED || ret == GRO_MERGED_FREE) |
| rxq->stats.lro_merged++; |
| rxq->stats.pkts++; |
| rxq->stats.rx_cso++; |
| } |
| |
| /** |
| * t4_ethrx_handler - process an ingress ethernet packet |
| * @q: the response queue that received the packet |
| * @rsp: the response queue descriptor holding the RX_PKT message |
| * @si: the gather list of packet fragments |
| * |
| * Process an ingress ethernet packet and deliver it to the stack. |
| */ |
| int t4_ethrx_handler(struct sge_rspq *q, const __be64 *rsp, |
| const struct pkt_gl *si) |
| { |
| bool csum_ok; |
| struct sk_buff *skb; |
| struct port_info *pi; |
| const struct cpl_rx_pkt *pkt; |
| struct sge_eth_rxq *rxq = container_of(q, struct sge_eth_rxq, rspq); |
| |
| if (unlikely(*(u8 *)rsp == CPL_TRACE_PKT)) |
| return handle_trace_pkt(q->adap, si); |
| |
| pkt = (const struct cpl_rx_pkt *)rsp; |
| csum_ok = pkt->csum_calc && !pkt->err_vec; |
| if ((pkt->l2info & htonl(RXF_TCP)) && |
| (q->netdev->features & NETIF_F_GRO) && csum_ok && !pkt->ip_frag) { |
| do_gro(rxq, si, pkt); |
| return 0; |
| } |
| |
| skb = cxgb4_pktgl_to_skb(si, RX_PKT_SKB_LEN, RX_PULL_LEN); |
| if (unlikely(!skb)) { |
| t4_pktgl_free(si); |
| rxq->stats.rx_drops++; |
| return 0; |
| } |
| |
| __skb_pull(skb, RX_PKT_PAD); /* remove ethernet header padding */ |
| skb->protocol = eth_type_trans(skb, q->netdev); |
| skb_record_rx_queue(skb, q->idx); |
| if (skb->dev->features & NETIF_F_RXHASH) |
| skb->rxhash = (__force u32)pkt->rsshdr.hash_val; |
| |
| pi = netdev_priv(skb->dev); |
| rxq->stats.pkts++; |
| |
| if (csum_ok && (pi->rx_offload & RX_CSO) && |
| (pkt->l2info & htonl(RXF_UDP | RXF_TCP))) { |
| if (!pkt->ip_frag) { |
| skb->ip_summed = CHECKSUM_UNNECESSARY; |
| rxq->stats.rx_cso++; |
| } else if (pkt->l2info & htonl(RXF_IP)) { |
| __sum16 c = (__force __sum16)pkt->csum; |
| skb->csum = csum_unfold(c); |
| skb->ip_summed = CHECKSUM_COMPLETE; |
| rxq->stats.rx_cso++; |
| } |
| } else |
| skb_checksum_none_assert(skb); |
| |
| if (unlikely(pkt->vlan_ex)) { |
| struct vlan_group *grp = pi->vlan_grp; |
| |
| rxq->stats.vlan_ex++; |
| if (likely(grp)) |
| vlan_hwaccel_receive_skb(skb, grp, ntohs(pkt->vlan)); |
| else |
| dev_kfree_skb_any(skb); |
| } else |
| netif_receive_skb(skb); |
| |
| return 0; |
| } |
| |
| /** |
| * restore_rx_bufs - put back a packet's Rx buffers |
| * @si: the packet gather list |
| * @q: the SGE free list |
| * @frags: number of FL buffers to restore |
| * |
| * Puts back on an FL the Rx buffers associated with @si. The buffers |
| * have already been unmapped and are left unmapped, we mark them so to |
| * prevent further unmapping attempts. |
| * |
| * This function undoes a series of @unmap_rx_buf calls when we find out |
| * that the current packet can't be processed right away afterall and we |
| * need to come back to it later. This is a very rare event and there's |
| * no effort to make this particularly efficient. |
| */ |
| static void restore_rx_bufs(const struct pkt_gl *si, struct sge_fl *q, |
| int frags) |
| { |
| struct rx_sw_desc *d; |
| |
| while (frags--) { |
| if (q->cidx == 0) |
| q->cidx = q->size - 1; |
| else |
| q->cidx--; |
| d = &q->sdesc[q->cidx]; |
| d->page = si->frags[frags].page; |
| d->dma_addr |= RX_UNMAPPED_BUF; |
| q->avail++; |
| } |
| } |
| |
| /** |
| * is_new_response - check if a response is newly written |
| * @r: the response descriptor |
| * @q: the response queue |
| * |
| * Returns true if a response descriptor contains a yet unprocessed |
| * response. |
| */ |
| static inline bool is_new_response(const struct rsp_ctrl *r, |
| const struct sge_rspq *q) |
| { |
| return RSPD_GEN(r->type_gen) == q->gen; |
| } |
| |
| /** |
| * rspq_next - advance to the next entry in a response queue |
| * @q: the queue |
| * |
| * Updates the state of a response queue to advance it to the next entry. |
| */ |
| static inline void rspq_next(struct sge_rspq *q) |
| { |
| q->cur_desc = (void *)q->cur_desc + q->iqe_len; |
| if (unlikely(++q->cidx == q->size)) { |
| q->cidx = 0; |
| q->gen ^= 1; |
| q->cur_desc = q->desc; |
| } |
| } |
| |
| /** |
| * process_responses - process responses from an SGE response queue |
| * @q: the ingress queue to process |
| * @budget: how many responses can be processed in this round |
| * |
| * Process responses from an SGE response queue up to the supplied budget. |
| * Responses include received packets as well as control messages from FW |
| * or HW. |
| * |
| * Additionally choose the interrupt holdoff time for the next interrupt |
| * on this queue. If the system is under memory shortage use a fairly |
| * long delay to help recovery. |
| */ |
| static int process_responses(struct sge_rspq *q, int budget) |
| { |
| int ret, rsp_type; |
| int budget_left = budget; |
| const struct rsp_ctrl *rc; |
| struct sge_eth_rxq *rxq = container_of(q, struct sge_eth_rxq, rspq); |
| |
| while (likely(budget_left)) { |
| rc = (void *)q->cur_desc + (q->iqe_len - sizeof(*rc)); |
| if (!is_new_response(rc, q)) |
| break; |
| |
| rmb(); |
| rsp_type = RSPD_TYPE(rc->type_gen); |
| if (likely(rsp_type == RSP_TYPE_FLBUF)) { |
| skb_frag_t *fp; |
| struct pkt_gl si; |
| const struct rx_sw_desc *rsd; |
| u32 len = ntohl(rc->pldbuflen_qid), bufsz, frags; |
| |
| if (len & RSPD_NEWBUF) { |
| if (likely(q->offset > 0)) { |
| free_rx_bufs(q->adap, &rxq->fl, 1); |
| q->offset = 0; |
| } |
| len = RSPD_LEN(len); |
| } |
| si.tot_len = len; |
| |
| /* gather packet fragments */ |
| for (frags = 0, fp = si.frags; ; frags++, fp++) { |
| rsd = &rxq->fl.sdesc[rxq->fl.cidx]; |
| bufsz = get_buf_size(rsd); |
| fp->page = rsd->page; |
| fp->page_offset = q->offset; |
| fp->size = min(bufsz, len); |
| len -= fp->size; |
| if (!len) |
| break; |
| unmap_rx_buf(q->adap, &rxq->fl); |
| } |
| |
| /* |
| * Last buffer remains mapped so explicitly make it |
| * coherent for CPU access. |
| */ |
| dma_sync_single_for_cpu(q->adap->pdev_dev, |
| get_buf_addr(rsd), |
| fp->size, DMA_FROM_DEVICE); |
| |
| si.va = page_address(si.frags[0].page) + |
| si.frags[0].page_offset; |
| prefetch(si.va); |
| |
| si.nfrags = frags + 1; |
| ret = q->handler(q, q->cur_desc, &si); |
| if (likely(ret == 0)) |
| q->offset += ALIGN(fp->size, FL_ALIGN); |
| else |
| restore_rx_bufs(&si, &rxq->fl, frags); |
| } else if (likely(rsp_type == RSP_TYPE_CPL)) { |
| ret = q->handler(q, q->cur_desc, NULL); |
| } else { |
| ret = q->handler(q, (const __be64 *)rc, CXGB4_MSG_AN); |
| } |
| |
| if (unlikely(ret)) { |
| /* couldn't process descriptor, back off for recovery */ |
| q->next_intr_params = QINTR_TIMER_IDX(NOMEM_TMR_IDX); |
| break; |
| } |
| |
| rspq_next(q); |
| budget_left--; |
| } |
| |
| if (q->offset >= 0 && rxq->fl.size - rxq->fl.avail >= 16) |
| __refill_fl(q->adap, &rxq->fl); |
| return budget - budget_left; |
| } |
| |
| /** |
| * napi_rx_handler - the NAPI handler for Rx processing |
| * @napi: the napi instance |
| * @budget: how many packets we can process in this round |
| * |
| * Handler for new data events when using NAPI. This does not need any |
| * locking or protection from interrupts as data interrupts are off at |
| * this point and other adapter interrupts do not interfere (the latter |
| * in not a concern at all with MSI-X as non-data interrupts then have |
| * a separate handler). |
| */ |
| static int napi_rx_handler(struct napi_struct *napi, int budget) |
| { |
| unsigned int params; |
| struct sge_rspq *q = container_of(napi, struct sge_rspq, napi); |
| int work_done = process_responses(q, budget); |
| |
| if (likely(work_done < budget)) { |
| napi_complete(napi); |
| params = q->next_intr_params; |
| q->next_intr_params = q->intr_params; |
| } else |
| params = QINTR_TIMER_IDX(7); |
| |
| t4_write_reg(q->adap, MYPF_REG(SGE_PF_GTS), CIDXINC(work_done) | |
| INGRESSQID((u32)q->cntxt_id) | SEINTARM(params)); |
| return work_done; |
| } |
| |
| /* |
| * The MSI-X interrupt handler for an SGE response queue. |
| */ |
| irqreturn_t t4_sge_intr_msix(int irq, void *cookie) |
| { |
| struct sge_rspq *q = cookie; |
| |
| napi_schedule(&q->napi); |
| return IRQ_HANDLED; |
| } |
| |
| /* |
| * Process the indirect interrupt entries in the interrupt queue and kick off |
| * NAPI for each queue that has generated an entry. |
| */ |
| static unsigned int process_intrq(struct adapter *adap) |
| { |
| unsigned int credits; |
| const struct rsp_ctrl *rc; |
| struct sge_rspq *q = &adap->sge.intrq; |
| |
| spin_lock(&adap->sge.intrq_lock); |
| for (credits = 0; ; credits++) { |
| rc = (void *)q->cur_desc + (q->iqe_len - sizeof(*rc)); |
| if (!is_new_response(rc, q)) |
| break; |
| |
| rmb(); |
| if (RSPD_TYPE(rc->type_gen) == RSP_TYPE_INTR) { |
| unsigned int qid = ntohl(rc->pldbuflen_qid); |
| |
| qid -= adap->sge.ingr_start; |
| napi_schedule(&adap->sge.ingr_map[qid]->napi); |
| } |
| |
| rspq_next(q); |
| } |
| |
| t4_write_reg(adap, MYPF_REG(SGE_PF_GTS), CIDXINC(credits) | |
| INGRESSQID(q->cntxt_id) | SEINTARM(q->intr_params)); |
| spin_unlock(&adap->sge.intrq_lock); |
| return credits; |
| } |
| |
| /* |
| * The MSI interrupt handler, which handles data events from SGE response queues |
| * as well as error and other async events as they all use the same MSI vector. |
| */ |
| static irqreturn_t t4_intr_msi(int irq, void *cookie) |
| { |
| struct adapter *adap = cookie; |
| |
| t4_slow_intr_handler(adap); |
| process_intrq(adap); |
| return IRQ_HANDLED; |
| } |
| |
| /* |
| * Interrupt handler for legacy INTx interrupts. |
| * Handles data events from SGE response queues as well as error and other |
| * async events as they all use the same interrupt line. |
| */ |
| static irqreturn_t t4_intr_intx(int irq, void *cookie) |
| { |
| struct adapter *adap = cookie; |
| |
| t4_write_reg(adap, MYPF_REG(PCIE_PF_CLI), 0); |
| if (t4_slow_intr_handler(adap) | process_intrq(adap)) |
| return IRQ_HANDLED; |
| return IRQ_NONE; /* probably shared interrupt */ |
| } |
| |
| /** |
| * t4_intr_handler - select the top-level interrupt handler |
| * @adap: the adapter |
| * |
| * Selects the top-level interrupt handler based on the type of interrupts |
| * (MSI-X, MSI, or INTx). |
| */ |
| irq_handler_t t4_intr_handler(struct adapter *adap) |
| { |
| if (adap->flags & USING_MSIX) |
| return t4_sge_intr_msix; |
| if (adap->flags & USING_MSI) |
| return t4_intr_msi; |
| return t4_intr_intx; |
| } |
| |
| static void sge_rx_timer_cb(unsigned long data) |
| { |
| unsigned long m; |
| unsigned int i, cnt[2]; |
| struct adapter *adap = (struct adapter *)data; |
| struct sge *s = &adap->sge; |
| |
| for (i = 0; i < ARRAY_SIZE(s->starving_fl); i++) |
| for (m = s->starving_fl[i]; m; m &= m - 1) { |
| struct sge_eth_rxq *rxq; |
| unsigned int id = __ffs(m) + i * BITS_PER_LONG; |
| struct sge_fl *fl = s->egr_map[id]; |
| |
| clear_bit(id, s->starving_fl); |
| smp_mb__after_clear_bit(); |
| |
| if (fl_starving(fl)) { |
| rxq = container_of(fl, struct sge_eth_rxq, fl); |
| if (napi_reschedule(&rxq->rspq.napi)) |
| fl->starving++; |
| else |
| set_bit(id, s->starving_fl); |
| } |
| } |
| |
| t4_write_reg(adap, SGE_DEBUG_INDEX, 13); |
| cnt[0] = t4_read_reg(adap, SGE_DEBUG_DATA_HIGH); |
| cnt[1] = t4_read_reg(adap, SGE_DEBUG_DATA_LOW); |
| |
| for (i = 0; i < 2; i++) |
| if (cnt[i] >= s->starve_thres) { |
| if (s->idma_state[i] || cnt[i] == 0xffffffff) |
| continue; |
| s->idma_state[i] = 1; |
| t4_write_reg(adap, SGE_DEBUG_INDEX, 11); |
| m = t4_read_reg(adap, SGE_DEBUG_DATA_LOW) >> (i * 16); |
| dev_warn(adap->pdev_dev, |
| "SGE idma%u starvation detected for " |
| "queue %lu\n", i, m & 0xffff); |
| } else if (s->idma_state[i]) |
| s->idma_state[i] = 0; |
| |
| mod_timer(&s->rx_timer, jiffies + RX_QCHECK_PERIOD); |
| } |
| |
| static void sge_tx_timer_cb(unsigned long data) |
| { |
| unsigned long m; |
| unsigned int i, budget; |
| struct adapter *adap = (struct adapter *)data; |
| struct sge *s = &adap->sge; |
| |
| for (i = 0; i < ARRAY_SIZE(s->txq_maperr); i++) |
| for (m = s->txq_maperr[i]; m; m &= m - 1) { |
| unsigned long id = __ffs(m) + i * BITS_PER_LONG; |
| struct sge_ofld_txq *txq = s->egr_map[id]; |
| |
| clear_bit(id, s->txq_maperr); |
| tasklet_schedule(&txq->qresume_tsk); |
| } |
| |
| budget = MAX_TIMER_TX_RECLAIM; |
| i = s->ethtxq_rover; |
| do { |
| struct sge_eth_txq *q = &s->ethtxq[i]; |
| |
| if (q->q.in_use && |
| time_after_eq(jiffies, q->txq->trans_start + HZ / 100) && |
| __netif_tx_trylock(q->txq)) { |
| int avail = reclaimable(&q->q); |
| |
| if (avail) { |
| if (avail > budget) |
| avail = budget; |
| |
| free_tx_desc(adap, &q->q, avail, true); |
| q->q.in_use -= avail; |
| budget -= avail; |
| } |
| __netif_tx_unlock(q->txq); |
| } |
| |
| if (++i >= s->ethqsets) |
| i = 0; |
| } while (budget && i != s->ethtxq_rover); |
| s->ethtxq_rover = i; |
| mod_timer(&s->tx_timer, jiffies + (budget ? TX_QCHECK_PERIOD : 2)); |
| } |
| |
| int t4_sge_alloc_rxq(struct adapter *adap, struct sge_rspq *iq, bool fwevtq, |
| struct net_device *dev, int intr_idx, |
| struct sge_fl *fl, rspq_handler_t hnd) |
| { |
| int ret, flsz = 0; |
| struct fw_iq_cmd c; |
| struct port_info *pi = netdev_priv(dev); |
| |
| /* Size needs to be multiple of 16, including status entry. */ |
| iq->size = roundup(iq->size, 16); |
| |
| iq->desc = alloc_ring(adap->pdev_dev, iq->size, iq->iqe_len, 0, |
| &iq->phys_addr, NULL, 0); |
| if (!iq->desc) |
| return -ENOMEM; |
| |
| memset(&c, 0, sizeof(c)); |
| c.op_to_vfn = htonl(FW_CMD_OP(FW_IQ_CMD) | FW_CMD_REQUEST | |
| FW_CMD_WRITE | FW_CMD_EXEC | |
| FW_IQ_CMD_PFN(adap->fn) | FW_IQ_CMD_VFN(0)); |
| c.alloc_to_len16 = htonl(FW_IQ_CMD_ALLOC | FW_IQ_CMD_IQSTART(1) | |
| FW_LEN16(c)); |
| c.type_to_iqandstindex = htonl(FW_IQ_CMD_TYPE(FW_IQ_TYPE_FL_INT_CAP) | |
| FW_IQ_CMD_IQASYNCH(fwevtq) | FW_IQ_CMD_VIID(pi->viid) | |
| FW_IQ_CMD_IQANDST(intr_idx < 0) | FW_IQ_CMD_IQANUD(1) | |
| FW_IQ_CMD_IQANDSTINDEX(intr_idx >= 0 ? intr_idx : |
| -intr_idx - 1)); |
| c.iqdroprss_to_iqesize = htons(FW_IQ_CMD_IQPCIECH(pi->tx_chan) | |
| FW_IQ_CMD_IQGTSMODE | |
| FW_IQ_CMD_IQINTCNTTHRESH(iq->pktcnt_idx) | |
| FW_IQ_CMD_IQESIZE(ilog2(iq->iqe_len) - 4)); |
| c.iqsize = htons(iq->size); |
| c.iqaddr = cpu_to_be64(iq->phys_addr); |
| |
| if (fl) { |
| fl->size = roundup(fl->size, 8); |
| fl->desc = alloc_ring(adap->pdev_dev, fl->size, sizeof(__be64), |
| sizeof(struct rx_sw_desc), &fl->addr, |
| &fl->sdesc, STAT_LEN); |
| if (!fl->desc) |
| goto fl_nomem; |
| |
| flsz = fl->size / 8 + STAT_LEN / sizeof(struct tx_desc); |
| c.iqns_to_fl0congen = htonl(FW_IQ_CMD_FL0PACKEN | |
| FW_IQ_CMD_FL0PADEN); |
| c.fl0dcaen_to_fl0cidxfthresh = htons(FW_IQ_CMD_FL0FBMIN(2) | |
| FW_IQ_CMD_FL0FBMAX(3)); |
| c.fl0size = htons(flsz); |
| c.fl0addr = cpu_to_be64(fl->addr); |
| } |
| |
| ret = t4_wr_mbox(adap, adap->fn, &c, sizeof(c), &c); |
| if (ret) |
| goto err; |
| |
| netif_napi_add(dev, &iq->napi, napi_rx_handler, 64); |
| iq->cur_desc = iq->desc; |
| iq->cidx = 0; |
| iq->gen = 1; |
| iq->next_intr_params = iq->intr_params; |
| iq->cntxt_id = ntohs(c.iqid); |
| iq->abs_id = ntohs(c.physiqid); |
| iq->size--; /* subtract status entry */ |
| iq->adap = adap; |
| iq->netdev = dev; |
| iq->handler = hnd; |
| |
| /* set offset to -1 to distinguish ingress queues without FL */ |
| iq->offset = fl ? 0 : -1; |
| |
| adap->sge.ingr_map[iq->cntxt_id - adap->sge.ingr_start] = iq; |
| |
| if (fl) { |
| fl->cntxt_id = ntohs(c.fl0id); |
| fl->avail = fl->pend_cred = 0; |
| fl->pidx = fl->cidx = 0; |
| fl->alloc_failed = fl->large_alloc_failed = fl->starving = 0; |
| adap->sge.egr_map[fl->cntxt_id - adap->sge.egr_start] = fl; |
| refill_fl(adap, fl, fl_cap(fl), GFP_KERNEL); |
| } |
| return 0; |
| |
| fl_nomem: |
| ret = -ENOMEM; |
| err: |
| if (iq->desc) { |
| dma_free_coherent(adap->pdev_dev, iq->size * iq->iqe_len, |
| iq->desc, iq->phys_addr); |
| iq->desc = NULL; |
| } |
| if (fl && fl->desc) { |
| kfree(fl->sdesc); |
| fl->sdesc = NULL; |
| dma_free_coherent(adap->pdev_dev, flsz * sizeof(struct tx_desc), |
| fl->desc, fl->addr); |
| fl->desc = NULL; |
| } |
| return ret; |
| } |
| |
| static void init_txq(struct adapter *adap, struct sge_txq *q, unsigned int id) |
| { |
| q->in_use = 0; |
| q->cidx = q->pidx = 0; |
| q->stops = q->restarts = 0; |
| q->stat = (void *)&q->desc[q->size]; |
| q->cntxt_id = id; |
| adap->sge.egr_map[id - adap->sge.egr_start] = q; |
| } |
| |
| int t4_sge_alloc_eth_txq(struct adapter *adap, struct sge_eth_txq *txq, |
| struct net_device *dev, struct netdev_queue *netdevq, |
| unsigned int iqid) |
| { |
| int ret, nentries; |
| struct fw_eq_eth_cmd c; |
| struct port_info *pi = netdev_priv(dev); |
| |
| /* Add status entries */ |
| nentries = txq->q.size + STAT_LEN / sizeof(struct tx_desc); |
| |
| txq->q.desc = alloc_ring(adap->pdev_dev, txq->q.size, |
| sizeof(struct tx_desc), sizeof(struct tx_sw_desc), |
| &txq->q.phys_addr, &txq->q.sdesc, STAT_LEN); |
| if (!txq->q.desc) |
| return -ENOMEM; |
| |
| memset(&c, 0, sizeof(c)); |
| c.op_to_vfn = htonl(FW_CMD_OP(FW_EQ_ETH_CMD) | FW_CMD_REQUEST | |
| FW_CMD_WRITE | FW_CMD_EXEC | |
| FW_EQ_ETH_CMD_PFN(adap->fn) | FW_EQ_ETH_CMD_VFN(0)); |
| c.alloc_to_len16 = htonl(FW_EQ_ETH_CMD_ALLOC | |
| FW_EQ_ETH_CMD_EQSTART | FW_LEN16(c)); |
| c.viid_pkd = htonl(FW_EQ_ETH_CMD_VIID(pi->viid)); |
| c.fetchszm_to_iqid = htonl(FW_EQ_ETH_CMD_HOSTFCMODE(2) | |
| FW_EQ_ETH_CMD_PCIECHN(pi->tx_chan) | |
| FW_EQ_ETH_CMD_IQID(iqid)); |
| c.dcaen_to_eqsize = htonl(FW_EQ_ETH_CMD_FBMIN(2) | |
| FW_EQ_ETH_CMD_FBMAX(3) | |
| FW_EQ_ETH_CMD_CIDXFTHRESH(5) | |
| FW_EQ_ETH_CMD_EQSIZE(nentries)); |
| c.eqaddr = cpu_to_be64(txq->q.phys_addr); |
| |
| ret = t4_wr_mbox(adap, adap->fn, &c, sizeof(c), &c); |
| if (ret) { |
| kfree(txq->q.sdesc); |
| txq->q.sdesc = NULL; |
| dma_free_coherent(adap->pdev_dev, |
| nentries * sizeof(struct tx_desc), |
| txq->q.desc, txq->q.phys_addr); |
| txq->q.desc = NULL; |
| return ret; |
| } |
| |
| init_txq(adap, &txq->q, FW_EQ_ETH_CMD_EQID_GET(ntohl(c.eqid_pkd))); |
| txq->txq = netdevq; |
| txq->tso = txq->tx_cso = txq->vlan_ins = 0; |
| txq->mapping_err = 0; |
| return 0; |
| } |
| |
| int t4_sge_alloc_ctrl_txq(struct adapter *adap, struct sge_ctrl_txq *txq, |
| struct net_device *dev, unsigned int iqid, |
| unsigned int cmplqid) |
| { |
| int ret, nentries; |
| struct fw_eq_ctrl_cmd c; |
| struct port_info *pi = netdev_priv(dev); |
| |
| /* Add status entries */ |
| nentries = txq->q.size + STAT_LEN / sizeof(struct tx_desc); |
| |
| txq->q.desc = alloc_ring(adap->pdev_dev, nentries, |
| sizeof(struct tx_desc), 0, &txq->q.phys_addr, |
| NULL, 0); |
| if (!txq->q.desc) |
| return -ENOMEM; |
| |
| c.op_to_vfn = htonl(FW_CMD_OP(FW_EQ_CTRL_CMD) | FW_CMD_REQUEST | |
| FW_CMD_WRITE | FW_CMD_EXEC | |
| FW_EQ_CTRL_CMD_PFN(adap->fn) | |
| FW_EQ_CTRL_CMD_VFN(0)); |
| c.alloc_to_len16 = htonl(FW_EQ_CTRL_CMD_ALLOC | |
| FW_EQ_CTRL_CMD_EQSTART | FW_LEN16(c)); |
| c.cmpliqid_eqid = htonl(FW_EQ_CTRL_CMD_CMPLIQID(cmplqid)); |
| c.physeqid_pkd = htonl(0); |
| c.fetchszm_to_iqid = htonl(FW_EQ_CTRL_CMD_HOSTFCMODE(2) | |
| FW_EQ_CTRL_CMD_PCIECHN(pi->tx_chan) | |
| FW_EQ_CTRL_CMD_IQID(iqid)); |
| c.dcaen_to_eqsize = htonl(FW_EQ_CTRL_CMD_FBMIN(2) | |
| FW_EQ_CTRL_CMD_FBMAX(3) | |
| FW_EQ_CTRL_CMD_CIDXFTHRESH(5) | |
| FW_EQ_CTRL_CMD_EQSIZE(nentries)); |
| c.eqaddr = cpu_to_be64(txq->q.phys_addr); |
| |
| ret = t4_wr_mbox(adap, adap->fn, &c, sizeof(c), &c); |
| if (ret) { |
| dma_free_coherent(adap->pdev_dev, |
| nentries * sizeof(struct tx_desc), |
| txq->q.desc, txq->q.phys_addr); |
| txq->q.desc = NULL; |
| return ret; |
| } |
| |
| init_txq(adap, &txq->q, FW_EQ_CTRL_CMD_EQID_GET(ntohl(c.cmpliqid_eqid))); |
| txq->adap = adap; |
| skb_queue_head_init(&txq->sendq); |
| tasklet_init(&txq->qresume_tsk, restart_ctrlq, (unsigned long)txq); |
| txq->full = 0; |
| return 0; |
| } |
| |
| int t4_sge_alloc_ofld_txq(struct adapter *adap, struct sge_ofld_txq *txq, |
| struct net_device *dev, unsigned int iqid) |
| { |
| int ret, nentries; |
| struct fw_eq_ofld_cmd c; |
| struct port_info *pi = netdev_priv(dev); |
| |
| /* Add status entries */ |
| nentries = txq->q.size + STAT_LEN / sizeof(struct tx_desc); |
| |
| txq->q.desc = alloc_ring(adap->pdev_dev, txq->q.size, |
| sizeof(struct tx_desc), sizeof(struct tx_sw_desc), |
| &txq->q.phys_addr, &txq->q.sdesc, STAT_LEN); |
| if (!txq->q.desc) |
| return -ENOMEM; |
| |
| memset(&c, 0, sizeof(c)); |
| c.op_to_vfn = htonl(FW_CMD_OP(FW_EQ_OFLD_CMD) | FW_CMD_REQUEST | |
| FW_CMD_WRITE | FW_CMD_EXEC | |
| FW_EQ_OFLD_CMD_PFN(adap->fn) | |
| FW_EQ_OFLD_CMD_VFN(0)); |
| c.alloc_to_len16 = htonl(FW_EQ_OFLD_CMD_ALLOC | |
| FW_EQ_OFLD_CMD_EQSTART | FW_LEN16(c)); |
| c.fetchszm_to_iqid = htonl(FW_EQ_OFLD_CMD_HOSTFCMODE(2) | |
| FW_EQ_OFLD_CMD_PCIECHN(pi->tx_chan) | |
| FW_EQ_OFLD_CMD_IQID(iqid)); |
| c.dcaen_to_eqsize = htonl(FW_EQ_OFLD_CMD_FBMIN(2) | |
| FW_EQ_OFLD_CMD_FBMAX(3) | |
| FW_EQ_OFLD_CMD_CIDXFTHRESH(5) | |
| FW_EQ_OFLD_CMD_EQSIZE(nentries)); |
| c.eqaddr = cpu_to_be64(txq->q.phys_addr); |
| |
| ret = t4_wr_mbox(adap, adap->fn, &c, sizeof(c), &c); |
| if (ret) { |
| kfree(txq->q.sdesc); |
| txq->q.sdesc = NULL; |
| dma_free_coherent(adap->pdev_dev, |
| nentries * sizeof(struct tx_desc), |
| txq->q.desc, txq->q.phys_addr); |
| txq->q.desc = NULL; |
| return ret; |
| } |
| |
| init_txq(adap, &txq->q, FW_EQ_OFLD_CMD_EQID_GET(ntohl(c.eqid_pkd))); |
| txq->adap = adap; |
| skb_queue_head_init(&txq->sendq); |
| tasklet_init(&txq->qresume_tsk, restart_ofldq, (unsigned long)txq); |
| txq->full = 0; |
| txq->mapping_err = 0; |
| return 0; |
| } |
| |
| static void free_txq(struct adapter *adap, struct sge_txq *q) |
| { |
| dma_free_coherent(adap->pdev_dev, |
| q->size * sizeof(struct tx_desc) + STAT_LEN, |
| q->desc, q->phys_addr); |
| q->cntxt_id = 0; |
| q->sdesc = NULL; |
| q->desc = NULL; |
| } |
| |
| static void free_rspq_fl(struct adapter *adap, struct sge_rspq *rq, |
| struct sge_fl *fl) |
| { |
| unsigned int fl_id = fl ? fl->cntxt_id : 0xffff; |
| |
| adap->sge.ingr_map[rq->cntxt_id - adap->sge.ingr_start] = NULL; |
| t4_iq_free(adap, adap->fn, adap->fn, 0, FW_IQ_TYPE_FL_INT_CAP, |
| rq->cntxt_id, fl_id, 0xffff); |
| dma_free_coherent(adap->pdev_dev, (rq->size + 1) * rq->iqe_len, |
| rq->desc, rq->phys_addr); |
| netif_napi_del(&rq->napi); |
| rq->netdev = NULL; |
| rq->cntxt_id = rq->abs_id = 0; |
| rq->desc = NULL; |
| |
| if (fl) { |
| free_rx_bufs(adap, fl, fl->avail); |
| dma_free_coherent(adap->pdev_dev, fl->size * 8 + STAT_LEN, |
| fl->desc, fl->addr); |
| kfree(fl->sdesc); |
| fl->sdesc = NULL; |
| fl->cntxt_id = 0; |
| fl->desc = NULL; |
| } |
| } |
| |
| /** |
| * t4_free_sge_resources - free SGE resources |
| * @adap: the adapter |
| * |
| * Frees resources used by the SGE queue sets. |
| */ |
| void t4_free_sge_resources(struct adapter *adap) |
| { |
| int i; |
| struct sge_eth_rxq *eq = adap->sge.ethrxq; |
| struct sge_eth_txq *etq = adap->sge.ethtxq; |
| struct sge_ofld_rxq *oq = adap->sge.ofldrxq; |
| |
| /* clean up Ethernet Tx/Rx queues */ |
| for (i = 0; i < adap->sge.ethqsets; i++, eq++, etq++) { |
| if (eq->rspq.desc) |
| free_rspq_fl(adap, &eq->rspq, &eq->fl); |
| if (etq->q.desc) { |
| t4_eth_eq_free(adap, adap->fn, adap->fn, 0, |
| etq->q.cntxt_id); |
| free_tx_desc(adap, &etq->q, etq->q.in_use, true); |
| kfree(etq->q.sdesc); |
| free_txq(adap, &etq->q); |
| } |
| } |
| |
| /* clean up RDMA and iSCSI Rx queues */ |
| for (i = 0; i < adap->sge.ofldqsets; i++, oq++) { |
| if (oq->rspq.desc) |
| free_rspq_fl(adap, &oq->rspq, &oq->fl); |
| } |
| for (i = 0, oq = adap->sge.rdmarxq; i < adap->sge.rdmaqs; i++, oq++) { |
| if (oq->rspq.desc) |
| free_rspq_fl(adap, &oq->rspq, &oq->fl); |
| } |
| |
| /* clean up offload Tx queues */ |
| for (i = 0; i < ARRAY_SIZE(adap->sge.ofldtxq); i++) { |
| struct sge_ofld_txq *q = &adap->sge.ofldtxq[i]; |
| |
| if (q->q.desc) { |
| tasklet_kill(&q->qresume_tsk); |
| t4_ofld_eq_free(adap, adap->fn, adap->fn, 0, |
| q->q.cntxt_id); |
| free_tx_desc(adap, &q->q, q->q.in_use, false); |
| kfree(q->q.sdesc); |
| __skb_queue_purge(&q->sendq); |
| free_txq(adap, &q->q); |
| } |
| } |
| |
| /* clean up control Tx queues */ |
| for (i = 0; i < ARRAY_SIZE(adap->sge.ctrlq); i++) { |
| struct sge_ctrl_txq *cq = &adap->sge.ctrlq[i]; |
| |
| if (cq->q.desc) { |
| tasklet_kill(&cq->qresume_tsk); |
| t4_ctrl_eq_free(adap, adap->fn, adap->fn, 0, |
| cq->q.cntxt_id); |
| __skb_queue_purge(&cq->sendq); |
| free_txq(adap, &cq->q); |
| } |
| } |
| |
| if (adap->sge.fw_evtq.desc) |
| free_rspq_fl(adap, &adap->sge.fw_evtq, NULL); |
| |
| if (adap->sge.intrq.desc) |
| free_rspq_fl(adap, &adap->sge.intrq, NULL); |
| |
| /* clear the reverse egress queue map */ |
| memset(adap->sge.egr_map, 0, sizeof(adap->sge.egr_map)); |
| } |
| |
| void t4_sge_start(struct adapter *adap) |
| { |
| adap->sge.ethtxq_rover = 0; |
| mod_timer(&adap->sge.rx_timer, jiffies + RX_QCHECK_PERIOD); |
| mod_timer(&adap->sge.tx_timer, jiffies + TX_QCHECK_PERIOD); |
| } |
| |
| /** |
| * t4_sge_stop - disable SGE operation |
| * @adap: the adapter |
| * |
| * Stop tasklets and timers associated with the DMA engine. Note that |
| * this is effective only if measures have been taken to disable any HW |
| * events that may restart them. |
| */ |
| void t4_sge_stop(struct adapter *adap) |
| { |
| int i; |
| struct sge *s = &adap->sge; |
| |
| if (in_interrupt()) /* actions below require waiting */ |
| return; |
| |
| if (s->rx_timer.function) |
| del_timer_sync(&s->rx_timer); |
| if (s->tx_timer.function) |
| del_timer_sync(&s->tx_timer); |
| |
| for (i = 0; i < ARRAY_SIZE(s->ofldtxq); i++) { |
| struct sge_ofld_txq *q = &s->ofldtxq[i]; |
| |
| if (q->q.desc) |
| tasklet_kill(&q->qresume_tsk); |
| } |
| for (i = 0; i < ARRAY_SIZE(s->ctrlq); i++) { |
| struct sge_ctrl_txq *cq = &s->ctrlq[i]; |
| |
| if (cq->q.desc) |
| tasklet_kill(&cq->qresume_tsk); |
| } |
| } |
| |
| /** |
| * t4_sge_init - initialize SGE |
| * @adap: the adapter |
| * |
| * Performs SGE initialization needed every time after a chip reset. |
| * We do not initialize any of the queues here, instead the driver |
| * top-level must request them individually. |
| */ |
| void t4_sge_init(struct adapter *adap) |
| { |
| unsigned int i, v; |
| struct sge *s = &adap->sge; |
| unsigned int fl_align_log = ilog2(FL_ALIGN); |
| |
| t4_set_reg_field(adap, SGE_CONTROL, PKTSHIFT_MASK | |
| INGPADBOUNDARY_MASK | EGRSTATUSPAGESIZE, |
| INGPADBOUNDARY(fl_align_log - 5) | PKTSHIFT(2) | |
| RXPKTCPLMODE | |
| (STAT_LEN == 128 ? EGRSTATUSPAGESIZE : 0)); |
| |
| for (i = v = 0; i < 32; i += 4) |
| v |= (PAGE_SHIFT - 10) << i; |
| t4_write_reg(adap, SGE_HOST_PAGE_SIZE, v); |
| t4_write_reg(adap, SGE_FL_BUFFER_SIZE0, PAGE_SIZE); |
| #if FL_PG_ORDER > 0 |
| t4_write_reg(adap, SGE_FL_BUFFER_SIZE1, PAGE_SIZE << FL_PG_ORDER); |
| #endif |
| t4_write_reg(adap, SGE_INGRESS_RX_THRESHOLD, |
| THRESHOLD_0(s->counter_val[0]) | |
| THRESHOLD_1(s->counter_val[1]) | |
| THRESHOLD_2(s->counter_val[2]) | |
| THRESHOLD_3(s->counter_val[3])); |
| t4_write_reg(adap, SGE_TIMER_VALUE_0_AND_1, |
| TIMERVALUE0(us_to_core_ticks(adap, s->timer_val[0])) | |
| TIMERVALUE1(us_to_core_ticks(adap, s->timer_val[1]))); |
| t4_write_reg(adap, SGE_TIMER_VALUE_2_AND_3, |
| TIMERVALUE0(us_to_core_ticks(adap, s->timer_val[2])) | |
| TIMERVALUE1(us_to_core_ticks(adap, s->timer_val[3]))); |
| t4_write_reg(adap, SGE_TIMER_VALUE_4_AND_5, |
| TIMERVALUE0(us_to_core_ticks(adap, s->timer_val[4])) | |
| TIMERVALUE1(us_to_core_ticks(adap, s->timer_val[5]))); |
| setup_timer(&s->rx_timer, sge_rx_timer_cb, (unsigned long)adap); |
| setup_timer(&s->tx_timer, sge_tx_timer_cb, (unsigned long)adap); |
| s->starve_thres = core_ticks_per_usec(adap) * 1000000; /* 1 s */ |
| s->idma_state[0] = s->idma_state[1] = 0; |
| spin_lock_init(&s->intrq_lock); |
| } |