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IB/core: Add ib_find_exact_cached_pkey()
When P_Key tables potentially contain both full and partial membership copies for the same P_Key, we need a function to find the index for an exact (16-bit) P_Key. This is necessary when the master forwards QP1 MADs sent by guests. If the guest has sent the MAD with a limited membership P_Key, we need to to forward the MAD using the same limited membership P_Key. Since the master may have both the limited and the full member P_Keys in its table, we must make sure to retrieve the limited membership P_Key in this case. Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il> Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com> Signed-off-by: Roland Dreier <roland@purestorage.com>
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2 changed files with 48 additions and 0 deletions
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@ -199,6 +199,38 @@ int ib_find_cached_pkey(struct ib_device *device,
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}
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}
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EXPORT_SYMBOL(ib_find_cached_pkey);
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EXPORT_SYMBOL(ib_find_cached_pkey);
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int ib_find_exact_cached_pkey(struct ib_device *device,
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u8 port_num,
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u16 pkey,
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u16 *index)
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{
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struct ib_pkey_cache *cache;
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unsigned long flags;
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int i;
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int ret = -ENOENT;
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if (port_num < start_port(device) || port_num > end_port(device))
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return -EINVAL;
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read_lock_irqsave(&device->cache.lock, flags);
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cache = device->cache.pkey_cache[port_num - start_port(device)];
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*index = -1;
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for (i = 0; i < cache->table_len; ++i)
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if (cache->table[i] == pkey) {
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*index = i;
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ret = 0;
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break;
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}
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read_unlock_irqrestore(&device->cache.lock, flags);
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return ret;
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}
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EXPORT_SYMBOL(ib_find_exact_cached_pkey);
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int ib_get_cached_lmc(struct ib_device *device,
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int ib_get_cached_lmc(struct ib_device *device,
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u8 port_num,
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u8 port_num,
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u8 *lmc)
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u8 *lmc)
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@ -100,6 +100,22 @@ int ib_find_cached_pkey(struct ib_device *device,
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u16 pkey,
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u16 pkey,
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u16 *index);
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u16 *index);
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/**
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* ib_find_exact_cached_pkey - Returns the PKey table index where a specified
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* PKey value occurs. Comparison uses the FULL 16 bits (incl membership bit)
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* @device: The device to query.
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* @port_num: The port number of the device to search for the PKey.
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* @pkey: The PKey value to search for.
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* @index: The index into the cached PKey table where the PKey was found.
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*
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* ib_find_exact_cached_pkey() searches the specified PKey table in
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* the local software cache.
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*/
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int ib_find_exact_cached_pkey(struct ib_device *device,
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u8 port_num,
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u16 pkey,
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u16 *index);
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/**
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/**
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* ib_get_cached_lmc - Returns a cached lmc table entry
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* ib_get_cached_lmc - Returns a cached lmc table entry
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* @device: The device to query.
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* @device: The device to query.
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