drivers/net/cxgbe/l2t.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2018 Chelsio Communications.
   3  * All rights reserved.
   4  */
   5 #include "common.h"
   6 #include "l2t.h"
   7
   8 /**
   9  * cxgbe_l2t_release - Release associated L2T entry
  10  * @e: L2T entry to release
  11  *
  12  * Releases ref count and frees up an L2T entry from L2T table
  13  */
  14 void cxgbe_l2t_release(struct l2t_entry *e)
  15 {
  16         if (rte_atomic32_read(&e->refcnt) != 0)
  17                 rte_atomic32_dec(&e->refcnt);
  18 }
  19
  20 /**
  21  * Process a CPL_L2T_WRITE_RPL. Note that the TID in the reply is really
  22  * the L2T index it refers to.
  23  */
  24 void do_l2t_write_rpl(struct adapter *adap, const struct cpl_l2t_write_rpl *rpl)
  25 {
  26         struct l2t_data *d = adap->l2t;
  27         unsigned int tid = GET_TID(rpl);
  28         unsigned int l2t_idx = tid % L2T_SIZE;
  29
  30         if (unlikely(rpl->status != CPL_ERR_NONE)) {
  31                 dev_err(adap,
  32                         "Unexpected L2T_WRITE_RPL status %u for entry %u\n",
  33                         rpl->status, l2t_idx);
  34                 return;
  35         }
  36
  37         if (tid & F_SYNC_WR) {
  38                 struct l2t_entry *e = &d->l2tab[l2t_idx - d->l2t_start];
  39
  40                 t4_os_lock(&e->lock);
  41                 if (e->state != L2T_STATE_SWITCHING)
  42                         e->state = L2T_STATE_VALID;
  43                 t4_os_unlock(&e->lock);
  44         }
  45 }
  46
  47 /**
  48  * Write an L2T entry.  Must be called with the entry locked.
  49  * The write may be synchronous or asynchronous.
  50  */
  51 static int write_l2e(struct rte_eth_dev *dev, struct l2t_entry *e, int sync,
  52                      bool loopback, bool arpmiss)
  53 {
  54         struct adapter *adap = ethdev2adap(dev);
  55         struct l2t_data *d = adap->l2t;
  56         struct rte_mbuf *mbuf;
  57         struct cpl_l2t_write_req *req;
  58         struct sge_ctrl_txq *ctrlq;
  59         unsigned int l2t_idx = e->idx + d->l2t_start;
  60         unsigned int port_id = ethdev2pinfo(dev)->port_id;
  61
  62         ctrlq = &adap->sge.ctrlq[port_id];
  63         mbuf = rte_pktmbuf_alloc(ctrlq->mb_pool);
  64         if (!mbuf)
  65                 return -ENOMEM;
  66
  67         mbuf->data_len = sizeof(*req);
  68         mbuf->pkt_len = mbuf->data_len;
  69
  70         req = rte_pktmbuf_mtod(mbuf, struct cpl_l2t_write_req *);
  71         INIT_TP_WR(req, 0);
  72
  73         OPCODE_TID(req) =
  74                 cpu_to_be32(MK_OPCODE_TID(CPL_L2T_WRITE_REQ,
  75                                           l2t_idx | V_SYNC_WR(sync) |
  76                                           V_TID_QID(adap->sge.fw_evtq.abs_id)));
  77         req->params = cpu_to_be16(V_L2T_W_PORT(e->lport) |
  78                                   V_L2T_W_LPBK(loopback) |
  79                                   V_L2T_W_ARPMISS(arpmiss) |
  80                                   V_L2T_W_NOREPLY(!sync));
  81         req->l2t_idx = cpu_to_be16(l2t_idx);
  82         req->vlan = cpu_to_be16(e->vlan);
  83         rte_memcpy(req->dst_mac, e->dmac, ETHER_ADDR_LEN);
  84
  85         if (loopback)
  86                 memset(req->dst_mac, 0, ETHER_ADDR_LEN);
  87
  88         t4_mgmt_tx(ctrlq, mbuf);
  89
  90         if (sync && e->state != L2T_STATE_SWITCHING)
  91                 e->state = L2T_STATE_SYNC_WRITE;
  92
  93         return 0;
  94 }
  95
  96 /**
  97  * find_or_alloc_l2e - Find/Allocate a free L2T entry
  98  * @d: L2T table
  99  * @vlan: VLAN id to compare/add
 100  * @port: port id to compare/add
 101  * @dmac: Destination MAC address to compare/add
 102  * Returns pointer to the L2T entry found/created
 103  *
 104  * Finds/Allocates an L2T entry to be used by switching rule of a filter.
 105  */
 106 static struct l2t_entry *find_or_alloc_l2e(struct l2t_data *d, u16 vlan,
 107                                            u8 port, u8 *dmac)
 108 {
 109         struct l2t_entry *end, *e;
 110         struct l2t_entry *first_free = NULL;
 111
 112         for (e = &d->l2tab[0], end = &d->l2tab[d->l2t_size]; e != end; ++e) {
 113                 if (rte_atomic32_read(&e->refcnt) == 0) {
 114                         if (!first_free)
 115                                 first_free = e;
 116                 } else {
 117                         if (e->state == L2T_STATE_SWITCHING) {
 118                                 if ((!memcmp(e->dmac, dmac, ETHER_ADDR_LEN)) &&
 119                                     e->vlan == vlan && e->lport == port)
 120                                         goto exists;
 121                         }
 122                 }
 123         }
 124
 125         if (first_free) {
 126                 e = first_free;
 127                 goto found;
 128         }
 129
 130         return NULL;
 131
 132 found:
 133         e->state = L2T_STATE_UNUSED;
 134
 135 exists:
 136         return e;
 137 }
 138
 139 static struct l2t_entry *t4_l2t_alloc_switching(struct rte_eth_dev *dev,
 140                                                 u16 vlan, u8 port,
 141                                                 u8 *eth_addr)
 142 {
 143         struct adapter *adap = ethdev2adap(dev);
 144         struct l2t_data *d = adap->l2t;
 145         struct l2t_entry *e;
 146         int ret = 0;
 147
 148         t4_os_write_lock(&d->lock);
 149         e = find_or_alloc_l2e(d, vlan, port, eth_addr);
 150         if (e) {
 151                 t4_os_lock(&e->lock);
 152                 if (!rte_atomic32_read(&e->refcnt)) {
 153                         e->state = L2T_STATE_SWITCHING;
 154                         e->vlan = vlan;
 155                         e->lport = port;
 156                         rte_memcpy(e->dmac, eth_addr, ETHER_ADDR_LEN);
 157                         rte_atomic32_set(&e->refcnt, 1);
 158                         ret = write_l2e(dev, e, 0, !L2T_LPBK, !L2T_ARPMISS);
 159                         if (ret < 0)
 160                                 dev_debug(adap, "Failed to write L2T entry: %d",
 161                                           ret);
 162                 } else {
 163                         rte_atomic32_inc(&e->refcnt);
 164                 }
 165                 t4_os_unlock(&e->lock);
 166         }
 167         t4_os_write_unlock(&d->lock);
 168
 169         return ret ? NULL : e;
 170 }
 171
 172 /**
 173  * cxgbe_l2t_alloc_switching - Allocate a L2T entry for switching rule
 174  * @dev: rte_eth_dev pointer
 175  * @vlan: VLAN Id
 176  * @port: Associated port
 177  * @dmac: Destination MAC address to add to L2T
 178  * Returns pointer to the allocated l2t entry
 179  *
 180  * Allocates a L2T entry for use by switching rule of a filter
 181  */
 182 struct l2t_entry *cxgbe_l2t_alloc_switching(struct rte_eth_dev *dev, u16 vlan,
 183                                             u8 port, u8 *dmac)
 184 {
 185         return t4_l2t_alloc_switching(dev, vlan, port, dmac);
 186 }
 187
 188 /**
 189  * Initialize L2 Table
 190  */
 191 struct l2t_data *t4_init_l2t(unsigned int l2t_start, unsigned int l2t_end)
 192 {
 193         unsigned int l2t_size;
 194         unsigned int i;
 195         struct l2t_data *d;
 196
 197         if (l2t_start >= l2t_end || l2t_end >= L2T_SIZE)
 198                 return NULL;
 199         l2t_size = l2t_end - l2t_start + 1;
 200
 201         d = t4_os_alloc(sizeof(*d) + l2t_size * sizeof(struct l2t_entry));
 202         if (!d)
 203                 return NULL;
 204
 205         d->l2t_start = l2t_start;
 206         d->l2t_size = l2t_size;
 207
 208         t4_os_rwlock_init(&d->lock);
 209
 210         for (i = 0; i < d->l2t_size; ++i) {
 211                 d->l2tab[i].idx = i;
 212                 d->l2tab[i].state = L2T_STATE_UNUSED;
 213                 t4_os_lock_init(&d->l2tab[i].lock);
 214                 rte_atomic32_set(&d->l2tab[i].refcnt, 0);
 215         }
 216
 217         return d;
 218 }
 219
 220 /**
 221  * Cleanup L2 Table
 222  */
 223 void t4_cleanup_l2t(struct adapter *adap)
 224 {
 225         if (adap->l2t)
 226                 t4_os_free(adap->l2t);
 227 }